Dept. of Information Technology - IBCN
Ghent University - IBBT
Gaston Crommenlaan 8 / 201
BE-9050 Gent, Belgium
Phone: +32 9 3314961
Fax: +32 9 3314899
Email: chris.develder[at]intec.UGent.be
C. Develder received the M.Sc. degree in computer science engineering and a Ph.D. in electrical engineering from Ghent University (Ghent, Belgium), in July 1999 and December 2003 respectively. From Oct. 1999 to Dec. 2003, he has been working in the Dept. of Information Technology (INTEC), at the same university, as a Researcher for the Research Foundation - Flanders (FWO), in the field of network design and planning. From Jan. 2004 to Aug. 2005, he worked for OPNET Technologies, on transport network design and planning. In Sep. 2005, he re-joined INTEC as a post-doctoral researcher, and as a post-doctoral fellow of the FWO since Oct. 2006. In Oct. 2007 he obtained a part-time, and since Feb. 2010 a fulltime associate professorship at Ghent University. He was and is involved in national and European research projects (IST David, IST Phosphorus, IST E-Photon One, BONE, IST Alpha, IST Geysers, etc.). His research interests include dimensioning, modeling and optimizing optical (Grid) networks and their control and management, smart grids, as well as multimedia and home network software and technologies. He regularly serves as reviewer/TPC member for international journals and conferences (IEEE/OSA JLT, IEEE/OSA JOCN, IEEE/ACM Trans. Networking, Computer Networks, IEEE Network, IEEE JSAC; IEEE ICC, IEEE SmartGridComm, ECOC, etc.)
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| Author / Editor / Organization | Title | Year | Journal / Proceedings / Book | BibTeX type |
|---|---|---|---|---|
| Baert, E.; Develder, C.; Pickavet, M. & Demeester, P. |
Routing strategies to minimize packet loss in an optical packet switched network with recirculating FDL buffers
[BibTeX] [DOI] [PDF] [plain text citation] |
2004 |
Photonic Netw. Commun. Vol. 7 (2), pp. 279-300 |
article |
BibTeX:
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| E. Baert, C. Develder, M. Pickavet and P. Demeester, "Routing strategies to minimize packet loss in an optical packet switched network with recirculating FDL buffers", Photonic Netw. Commun., Vol. 7, No. 2, Mar. 2004, pp. 279-300. doi:10.1023/B:PNET.0000026892.02534.ad | ||||
| Bjornstad, S.; Nord, M.; Hjelme, D.R.; Stol, N.; Develder, C.; Cheyns, J.; Van Breusegem, E.; Baert, E.; Colle, D.; Pickavet, M.; Demeester, P.; Callegati, F.; Cerroni, W.; Raffaelli, C.; Zaffoni, P.; Lackovic, M.; Gauger, C.M.; Careglio, D.; Junyent, G.; Klinkowski, M.; Marciniak, M. & Kowalewski, M. |
Optical burst and packet switching: node and network design, contention resolution and quality of service
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2003 |
Vol. 2 Proc. 7th Int. Conf. on Telecommunications (ConTEL 2003), pp. 775-782 |
inproceedings |
| Abstract: Future network should be able to efficiently serve packet-based networks, such as the Internet. In this paper, based on results from COST 266, we explore characteristics of optical burst switching (OBS) and optical packet switching (OPS). Both node design and metropolitan area network (MAN) are discussed. A unique joint comparative performance evaluation of contention resolution in OBS and OPS are presented, as well as methods of quality of service (QoS) differentiation in OBS/OPS networks, and their performance. | ||||
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| S. Bjornstad, M. Nord, D.R. Hjelme, N. Stol, C. Develder, J. Cheyns, E. Van Breusegem, E. Baert, D. Colle, M. Pickavet, P. Demeester, F. Callegati, W. Cerroni, C. Raffaelli, P. Zaffoni, M. Lackovic, C.M. Gauger, D. Careglio, G. Junyent, M. Klinkowski, M. Marciniak and M. Kowalewski, "Optical burst and packet switching: node and network design, contention resolution and quality of service", Vol. 2, in Proc. 7th Int. Conf. on Telecommunications (ConTEL 2003), Zagreb, Croatia, 11-13 Jun. 2003, pp. 775-782. doi:10.1109/CONTEL.2003.1215913 | ||||
| Boone, B.; Van Hoecke, S.; Van Seghbroeck, G.; Jonckheere, N.; Jonckers, V.; De Turck, F.; Develder, C. & Dhoedt, B. | SALSA: QoS-aware load balancing for autonomous service brokering | 2010 |
J. Syst. Softw. Vol. 83 (3), pp. 446-456 |
article |
| Abstract: The evolution towards #Software##as##a##Service#, facilitated by various web service technologies, has led to applications composed of a number of service building blocks. These applications are dynamically composed by web service brokers, but rely critically on proper functioning of each of the composing subparts which is not entirely under control of the applications themselves. The problem at hand for the provider of the service is to guarantee non-functional requirements such as service access and performance to each customer. To this end, the service provider typically divides the load of incoming service requests across the available server infrastructure. In this paper we describe an adaptive load balancing strategy called SALSA (Simulated Annealing Load Spreading Algorithm), which is able to guarantee for different customer priorities, such as default and premium customers, that the services are handled in a given time and this without the need to adapt the servers executing the service logic themselves. It will be shown that by using SALSA, web service brokers are able to autonomously meet SLAs, without a priori over-dimensioning resources. This will be done by taking into account a real time view of the requests by measuring the Poisson arrival rates at that moment and selectively drop some requests from default customers. This way the web servers' load is reduced in order to guarantee the service time for premium customers and provide best effort to default customers. We compared the results of SALSA with weighted round-robin (WRR), nowadays the most used load balancing strategy, and it was shown that the SALSA algorithm requires slightly more processing than WRR but is able to offer guarantees -contrary to WRR- by dynamically adapting its load balancing strategy. | ||||
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| B. Boone, S. Van Hoecke, G. Van Seghbroeck, N. Jonckheere, V. Jonckers, F. De Turck, C. Develder and B. Dhoedt, "SALSA: QoS-aware load balancing for autonomous service brokering", J. Syst. Softw., Vol. 83, No. 3, Mar. 2010, pp. 446-456. doi:10.1016/j.jss.2009.09.033 | ||||
| Brewka, L.; Sköldström, P.; Nelis, J.; Wessing, H. & Develder, C. |
Automatic Provisioning of End-to-End QoS into the Home
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 |
IEEE Trans. Consumer Electronics Vol. 57 (4), pp. 1670-1678 |
article |
| Abstract: Due to a growing number of high bandwidth applications today (such as HDTV), and an increasing amount of network and cloud based applications, service providers need to pay attention to QoS in their networks. We believe there is a need for an end-to-end approach reaching into the home as well. The Home Gateway (HG) as a key component of the home network is crucial for enabling the end-to-end solutions. UPnP-QoS has been proposed as an inhome solution for resource reservations. In this paper we assess a solution for automatic QoS reservations, on behalf of non-UPnP-QoS aware applications. Additionally we focus on an integrated end-to-end solution, combining GMPLS-based reservations in e.g., access/metro and UPnP-QoS based reservation in the home network. | ||||
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| L. Brewka, P. Sköldström, J. Nelis, H. Wessing and C. Develder, "Automatic Provisioning of End-to-End QoS into the Home", IEEE Trans. Consumer Electronics, Vol. 57, No. 4, Nov. 2011, pp. 1670-1678. doi:10.1109/TCE.2011.6131140 | ||||
| Buysse, J.; Cavdar, C.; De Leenheer, M.; Dhoedt, B. & Develder, C. |
Improving energy efficiency in optical cloud networks by exploiting anycast routing
[Abstract] [BibTeX] [PDF] [plain text citation] |
2011 | Proc. Asia Communications and Photonics Conf. (ACP 2011) | inproceedings |
| Abstract: Exploiting anycast routing significantly reduces optical network and server energy usage. A case study shows that intelligently selecting destinations and routes thereto, while switching off unused (network) elements, cuts power consumption by around 20% and saves network resources by 29 | ||||
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| J. Buysse, C. Cavdar, M. De Leenheer, B. Dhoedt and C. Develder, "Improving energy efficiency in optical cloud networks by exploiting anycast routing", in Proc. Asia Communications and Photonics Conf. (ACP 2011), Shanghai, China, 13-16 Nov. 2011. | ||||
| Buysse, J.; De Leenheer, M.; Dhoedt, B. & Develder, C. |
Providing resiliency for optical grids by exploiting relocation: A dimensioning study based on ILP
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 |
Comput. Commun. Vol. 34 (12), pp. 1389-1398 |
article |
| Abstract: Grids use a form of distributed computing to tackle complex computational and data processing problems scientists are presented with today. When designing an (optical) network supporting grids, it is essential that it can overcome single network failures, for which several protection schemes have been devised in the past. In this work, we extend the existing Shared Path protection scheme by incorporating the anycast principle typical of grids: a user typically does not care on what specific server this job gets executed and is merely interested in its timely delivery of results. Therefore, in contrast with Classical Shared Path protection (CSP), we will not necessarily provide a backup path between the source and the original destination. Instead, we allow to relocate the job to another server location if we can thus provide a backup path which comprises less wavelengths than the one CSP would suggest. We assess the bandwidth savings enabled by relocation in a quantitative dimensioning case study on an European and an American network topology, exhibiting substantial savings of the number of required wavelengths (in the order of 11-50%, depending on network topology and server locations). We also investigate how relocation affects the computational load on the execution servers. The case study is based on solving a grid network dimensioning problem: we present Integer Linear Programming (ILP) formulations for both the traditional CSP and the new resilience scheme exploiting relocation (SPR). We also outline a strategy to deal with the anycast principle: assuming we are given just the origins and intensity of job arrivals, we derive a static (source,†destination)-based demand matrix. The latter is then used as input to solve the network dimensioning ILP for an optical circuit-switched WDM network. | ||||
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| J. Buysse, M. De Leenheer, B. Dhoedt and C. Develder, "Providing resiliency for optical grids by exploiting relocation: A dimensioning study based on ILP", Comput. Commun., Vol. 34, No. 12, Aug. 2011, pp. 1389-1398. doi:10.1016/j.comcom.2010.12.014 | ||||
| Buysse, J.; De Leenheer, M.; Dhoedt, B. & Develder, C. |
On the impact of relocation on network dimensions in resilient optical Grids
[Abstract] [BibTeX] [DOI] [NOTE] [PDF] [plain text citation] |
2010 | Proc. 14th Int. Conf. on Optical Network Design and Modelling (ONDM 2010) | inproceedings |
| Abstract: Optical networks, with their high bandwidths and low latencies, are excellent to support Grid applications, esp. those arising in so-called eScience applications. In this paper, we consider the resulting so-called optical grids. We address the issue of resiliency against network failures and show how the Grid-specific anycast principle can be exploited in providing shared protection. Since in Grid scenarios users generally allow the Grid system to decide upon the location where jobs are executed, we exploit relocation to alternate backup sites in case of failures. We provide integer linear programming (ILP) solutions to the resulting routing and wavelength assignment problems, as well as a scalable heuristic. A case study on a European network topology shows that this relocation allows savings in the order of 16% of total wavelength capacity compared to traditional shared path protection. | ||||
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| J. Buysse, M. De Leenheer, B. Dhoedt and C. Develder, "On the impact of relocation on network dimensions in resilient optical Grids", in Proc. 14th Int. Conf. on Optical Network Design and Modelling (ONDM 2010), Kyoto, Japan, 31 Jan.-3 Feb. 2010. doi:10.1109/ONDM.2010.5431591 | ||||
| Buysse, J.; De Leenheer, M.; Dhoedt, B. & Develder, C. |
Exploiting relocation to reduce network dimensions of resilient optical Grids
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2009 | Proc. 7th Int. Workshop Design of Reliable Commun. Netw. (DRCN 2009), pp. 100-106 | inproceedings |
| Abstract: Optical Grids are widely deployed to solve complex problems we are facing today. An important aspect of the supporting network is resiliency i.e. the ability to overcome network failures. In contrast to classical network protection schemes, we will not necessarily provide a back-up path between the source and the original destination. Instead, we will try to relocate the job to another server location if this means that we can provide a backup path which comprises less wavelengths than the one the traditional scheme would suggest. This relocation can be backed up by the Grid specific anycast principle: a user generally does not care where his job is executed and is only interested in its results. We present ILP formulations for both resilience schemes and we evaluate them in a case study on an European network topology. | ||||
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| J. Buysse, M. De Leenheer, B. Dhoedt and C. Develder, "Exploiting relocation to reduce network dimensions of resilient optical Grids", in Proc. 7th Int. Workshop Design of Reliable Commun. Netw. (DRCN 2009), Washington, D.C., USA, 25-28 Oct. 2009, pp. 100-106. doi:10.1109/DRCN.2009.5340020 | ||||
| Buysse, J.; De Leenheer, M.; Develder, C.; Dhoedt, B. & Demeester, P. |
Cost-Effective Burst-Over-Circuit-Switching in a Hybrid Optical Network
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2009 | Proc. 5th Int. Conf. Networking and Services (ICNS 2009), pp. 499-504 | inproceedings |
| Abstract: All optical switching has been proposed as a candidate to allow high capacity networking in the future. Currently, Optical Circuit Switching has been widely deployed, although this approach is potentially bandwidth-inefficient for small granularity flows and needs relatively long set-up times. Research is being done into Optical Packet Switching (OPS) and Optical Burst Switching (OBS), but these kinds of architectures are not yet able to be deployed due to the large network cost they impose. This paper tries to combine the benefits from OCS and OBS, by investigating a hybrid switching technique called burst-over-circuit switching (BoCS) where both OBS and OCS are used at a specific part in the network. First, a short summary will be provided, categorising existing hybrid ideas. Then, a simulation study will evaluate how well BoCS performs compared to pure OBS or OCS and finally the feasibility of the proposed method will be investigated by a network cost analysis. | ||||
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| J. Buysse, M. De Leenheer, C. Develder, B. Dhoedt and P. Demeester, "Cost-Effective Burst-Over-Circuit-Switching in a Hybrid Optical Network", in Proc. 5th Int. Conf. Networking and Services (ICNS 2009), Valencia, Spain, 20-25 Apr. 2009, pp. 499-504. doi:10.1109/ICNS.2009.12 | ||||
| Buysse, J.; Develder, C.; De Leenheer, M. & Dhoedt, B. |
ILP and scalable heuristics for dimensioning resilient optical grids
[BibTeX] [NOTE] [PDF] [plain text citation] |
2010 | Proc. 14th INFORMS Telecommun. Conf. | inproceedings |
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| J. Buysse, C. Develder, M. De Leenheer and B. Dhoedt, "ILP and scalable heuristics for dimensioning resilient optical grids", in Proc. 14th INFORMS Telecommun. Conf., Montreal, Canada, 5-9 May 2010. | ||||
| Buysse, J.; Georgakilas, K.; Tzanakaki, A.; De Leenheer, M.; Dhoedt, B.; Demeester, P. & Develder, C. |
Calculating the minimum bounds of energy consumption for cloud networks
[BibTeX] [DOI] [PDF] [plain text citation] |
2011 | Proc. IEEE Int. Conf. Computer Commun. and Networks (ICCCN 2011), pp. 1-7 | inproceedings |
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| J. Buysse, K. Georgakilas, A. Tzanakaki, M. De Leenheer, B. Dhoedt, P. Demeester and C. Develder, "Calculating the minimum bounds of energy consumption for cloud networks", in Proc. IEEE Int. Conf. Computer Commun. and Networks (ICCCN 2011), Maui, Hawaii, 31 Jul. - 4 Aug. 2011, pp. 1-7. doi:10.1109/ICCCN.2011.6005778 | ||||
| Callegati, F.; Develder, C.; Cerroni, W.; Pickavet, M. & Demeester, P. |
Scheduling algorithms for a slotted packet switch with either fixed or variable length packets
[BibTeX] [DOI] [PDF] [plain text citation] |
2004 |
Photonic Netw. Commun. Vol. 8 (2), pp. 163-176 |
article |
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| F. Callegati, C. Develder, W. Cerroni, M. Pickavet and P. Demeester, "Scheduling algorithms for a slotted packet switch with either fixed or variable length packets", Photonic Netw. Commun., Vol. 8, No. 2, Sep. 2004, pp. 163-176. doi:10.1023/B:PNET.0000033976.33668.65 | ||||
| Cheyns, J.; Colle, D.; Develder, C.; Van Breusegem, E.; Pickavet, M. & Demeester, P. |
Upgrade scenarios for OPS networks
[BibTeX] [DOI] [PDF] [plain text citation] |
2005 | Proc. 9th Conf. on Optical Network Design and Modelling (ONDM 2005), pp. 27-39 | inproceedings |
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| J. Cheyns, D. Colle, C. Develder, E. Van Breusegem, M. Pickavet and P. Demeester, "Upgrade scenarios for OPS networks", in Proc. 9th Conf. on Optical Network Design and Modelling (ONDM 2005), Milan, Italy, 7-9 Feb. 2005, pp. 27-39. doi:10.1109/ONDM.2005.1426983 | ||||
| Cheyns, J.; Develder, C.; Colle, D.; Van Breusegem, E. & Demeester, P. |
Cost Efficient Upgrading of OPS Nodes
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2004 | Proc. IFIP TC6/WG6.10 1st Optical Networks and Technologies Conf. (OpNeTec 2004), pp. 71-78 | inproceedings |
| Abstract: We come back on a technique to build modular switch nodes. This approach allows for a more cost effective expansion of OPS nodes. We give two example designs, showing that the method is useful only for Broadcast & Select OPS nodes when taking price decrease in function of time into account. | ||||
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| J. Cheyns, C. Develder, D. Colle, E. Van Breusegem and P. Demeester, "Cost Efficient Upgrading of OPS Nodes", IFIP Int. Federation For Information Processing, in Proc. IFIP TC6/WG6.10 1st Optical Networks and Technologies Conf. (OpNeTec 2004), Pisa, Italy, 18-20 Feb. 2004, pp. 71-78. doi:10.1007/0-387-23178-1_8 | ||||
| Cheyns, J.; Develder, C.; Van Breusegem, E.; Baert, E.; Ackaert, A.; Pickavet, M. & Demeester, P. |
Routing in an AWG based optical packet switch
[BibTeX] [DOI] [PDF] [plain text citation] |
2003 |
Photonic Netw. Commun. Vol. 5 (1), pp. 69-80 |
article |
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| J. Cheyns, C. Develder, E. Van Breusegem, E. Baert, A. Ackaert, M. Pickavet and P. Demeester, "Routing in an AWG based optical packet switch", Photonic Netw. Commun., Vol. 5, No. 1, Jan. 2003, pp. 69-80. doi:10.1023/A:1021005913665 | ||||
| Cheyns, J.; Develder, C.; Van Breusegem, E.; Colle, D.; De Turck, F.; Lagasse, P.; Pickavet, M. & Demeester, P. |
Clos lives on in optical packet switching
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2004 |
IEEE Commun. Mag. Vol. 42 (2), pp. 114-121 |
article |
| Abstract: While the technological evolution since C. Clos's seminal article (see Bell Sys. Tech. J., vol.32, p.406-24, 1953) on multistage switch architectures has been huge, his work and ideas still live on. We discuss node architectures for optical packet switching and show how the multistage approach proposed by Clos can be adopted to solve scalability issues and construct switches with large port counts. As in the old days, the driving factors behind the introduction of multistage concepts also include economic issues: compared to a single-stage architecture, the number of components to realize the switching fabric is reduced. | ||||
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| J. Cheyns, C. Develder, E. Van Breusegem, D. Colle, F. De Turck, P. Lagasse, M. Pickavet and P. Demeester, "Clos lives on in optical packet switching", IEEE Commun. Mag., Vol. 42, No. 2, Feb. 2004, pp. 114-121. doi:10.1109/MCOM.2003.1267109 | ||||
| Cheyns, J.; Van Breusegem, E.; Develder, C.; Ackaert, A.; Pickavet, M. & Demeester, P. |
Performance improvement of an internally blocking optical packet/burst switch
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2003 |
Vol. 2 Proc. IEEE Int. Conf. on Commun. (ICC 2003), pp. 1304-1308 vol.2 |
inproceedings |
| Abstract: Optical packet/burst switching is considered a promising technique to improve the performance of optical networks. Key components in these technologies are the optical switching nodes. Some of these node architectures suffer from internal blocking. Synchronous operation allows overcoming most of the problems introduced by this internal blocking. However, in asynchronous networks internal blocking can have a more pronounced effect. In this paper, we propose a windowing technique to improve the performance of internally blocking optical switching nodes in asynchronous operation. Simulations will show significant improvements can be made. | ||||
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| J. Cheyns, E. Van Breusegem, C. Develder, A. Ackaert, M. Pickavet and P. Demeester, "Performance improvement of an internally blocking optical packet/burst switch", Vol. 2, in Proc. IEEE Int. Conf. on Commun. (ICC 2003), Anchorage, AK, USA, 11-13 May 2003, pp. 1304-1308 vol.2. doi:10.1109/ICC.2003.1204594 | ||||
| Cheyns, J.; Van Breusegem, E.; Develder, Chris adn Colle, D.; Pickavet, M. & Demeester, P. |
Evaluating cost functions for OPS node architectures / A packaging driven approach
[BibTeX] [PDF] [plain text citation] |
2004 | Proc. 8th IFIP Working Conf. on Optical Network Design and Modelling (ONDM 2004), pp. 37-56 | inproceedings |
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| J. Cheyns, E. Van Breusegem, D. Develder, Chris adn Colle, M. Pickavet and P. Demeester, "Evaluating cost functions for OPS node architectures / A packaging driven approach", in Proc. 8th IFIP Working Conf. on Optical Network Design and Modelling (ONDM 2004), Ghent, Belgium, 2-4 Feb. 2004, pp. 37-56. | ||||
| Christodoulopoulos, K.; Varvarigos, E.; Develder, C.; De Leenheer, M. & Dhoedt, B. |
Job demand models for optical grid research
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2007 | Proc. 11th Int. IFIP TC6 Conf. on Optical Netw. Design and Modeling (ONDM2007), pp. 127-136 | inproceedings |
| Abstract: This paper presents results from the IST Phosphorus project that studies and implements an optical Grid test-bed. A significant part of this project addresses scheduling and routing algorithms and dimensioning problems of optical grids. Given the high costs involved in setting up actual hardware implementations, simulations are a viable alternative. In this paper we present an initial study which proposes models that reflect real-world grid application traffic characteristics, appropriate for simulation purposes. We detail several such models and the corresponding process to extract the model parameters from real grid log traces, and verify that synthetically generated jobs provide a realistic approximation of the real-world grid job submission process. | ||||
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| K. Christodoulopoulos, E. Varvarigos, C. Develder, M. De Leenheer and B. Dhoedt, "Job demand models for optical grid research", in Proc. 11th Int. IFIP TC6 Conf. on Optical Netw. Design and Modeling (ONDM2007), Athens, Greece, 29-31 May 2007, pp. 127-136. doi:10.1016/j.comcom.2009.03.004 | ||||
| Colle, D.; Cheyns, J.; Develder, C.; Van Breusegem, E.; Ackaert, A.; Pickavet, M. & Demeester, P. |
GMPLS extensions for supporting advanced optical networking technologies
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2003 |
Vol. 1 Proc. 5th Int. Conf. on Transparent Optical Networks (ICTON 2003), pp. 170-173 |
inproceedings |
| Abstract: In response to the need for higher flexibility in optical networks, a generalised multiprotocol label switching (GMPLS) protocol suite is currently under standardisation. However, in these standards a label switched path (LSP) hierarchy is defined that only considers circuit-switched optical networks. The paper aims at broadening the scope of this hierarchy to more advanced optical networking technologies. | ||||
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| D. Colle, J. Cheyns, C. Develder, E. Van Breusegem, A. Ackaert, M. Pickavet and P. Demeester, "GMPLS extensions for supporting advanced optical networking technologies", Vol. 1, in Proc. 5th Int. Conf. on Transparent Optical Networks (ICTON 2003), 2003, pp. 170-173. doi:10.1109/ICTON.2003.1264604 | ||||
| Colle, D.; De Maesschalck, S.; Develder, C.; Groebbens, A.; Pickavet, M. & Demeester, P. Dubendorf, Switzerland |
Design and dimensioning issues in survivable data-centric optical networks (Invited)
[BibTeX] [PDF] [plain text citation] |
2001 | Proc. 1st COST270 Workshop on Reliability of Optical Netw., Systems and Components | inproceedings |
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| D. Colle, S. De Maesschalck, C. Develder, A. Groebbens, M. Pickavet and P. Demeester, "Design and dimensioning issues in survivable data-centric optical networks (Invited)", in Proc. 1st COST270 Workshop on Reliability of Optical Netw., Systems and Components, 12-13 Dec. 2001. | ||||
| Colle, D.; De Maesschalck, S.; Develder, C.; Van Heuven, P.; Groebbens, A.; Cheyns, J.; Lievens, I.; Pickavet, M.; Lagasse, P. & Demeester, P. |
Data-centric optical networks and their survivability
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2002 |
IEEE J. Sel. Areas Commun. Vol. 20 (1), pp. 6-20 |
article |
| Abstract: The explosive growth of data traffic-for example, due to the popularity of the Internet-poses important emerging network requirements on today's telecommunication networks. This paper describes how core networks will evolve to optical transport networks (OTNs), which are optimized for the transport of data traffic, resulting in an IP-directly-over-OTN paradigm. Special attention is paid to the survivability of such data-centric optical networks. This becomes increasingly crucial since more and more traffic is multiplexed onto a single fiber (e.g., 160×10 Gb/s), implying that a single cable cut can affect incredible large traffic volumes. In particular, this paper is tackling multilayer survivability problems, since a data- centric optical network consists of at least an IP and optical layer. In practice, this means that the questions "in which layer or layers should survivability be provided?" and "if multiple layers are chosen for this purpose, then how should this functionality in these layers be coordinated?" have to be answered. In addition to a theoretical study, some case studies are presented in order to illustrate the relevance of the described issues and to help in strategic planning decisions. Two case studies are studying the problem from a capacity viewpoint. Another case study presents simulations from a timing/throughput performance viewpoint | ||||
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| D. Colle, S. De Maesschalck, C. Develder, P. Van Heuven, A. Groebbens, J. Cheyns, I. Lievens, M. Pickavet, P. Lagasse and P. Demeester, "Data-centric optical networks and their survivability", IEEE J. Sel. Areas Commun., Vol. 20, No. 1, Jan. 2002, pp. 6-20. doi:10.1109/49.974658 | ||||
| Colle, D.; Develder, C.; Van Heuven, P.; De Maesschalck, S.; Groebbens, A.; Pickavet, M. & Demeester, P. |
Resilience in IP-over-WDM networks (Invited)
[BibTeX] [PDF] [plain text citation] |
2001 | Proc. 5th Working Conf. on Optical Netw. Design and Modelling (ONDM 2001) | inproceedings |
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| D. Colle, C. Develder, P. Van Heuven, S. De Maesschalck, A. Groebbens, M. Pickavet and P. Demeester, "Resilience in IP-over-WDM networks (Invited)", in Proc. 5th Working Conf. on Optical Netw. Design and Modelling (ONDM 2001), Vienna, Austria, 5-7 Feb. 2001. | ||||
| Colle, D.; Develder, C.; Van Heuven, P.; Pickavet, M.; Demeester, P.; Raptis, L.; Chatzilias, G.; Mas, C.; Manolessos, Y.; Comellas, J.; Rafel, A.; Prat, J.; Sol'e-Pareta, J.; Moyano, J.and Brunazzi, S.; Rotolo, S.; Stankiewicz, R. & Gladish, A. |
Recovery techniques for IP-over-WDM networks (Invited)
[BibTeX] [PDF] [plain text citation] |
2000 | Proc. IP over DWDM Conf. | inproceedings |
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| D. Colle, C. Develder, P. Van Heuven, M. Pickavet, P. Demeester, L. Raptis, G. Chatzilias, C. Mas, Y. Manolessos, J. Comellas, A. Rafel, J. Prat, J. Sol'e-Pareta, S. Moyano, J.and Brunazzi, S. Rotolo, R. Stankiewicz and A. Gladish, "Recovery techniques for IP-over-WDM networks (Invited)", in Proc. IP over DWDM Conf., Paris, France, 27-30 Nov. 2000. | ||||
| Colle, D.; Van Heuven, P.; Develder, C.; Van den Berghe, S.; Lievens, I.; Pickavet, M. & Demeester, P. |
MPLS recovery mechanisms for IP-over-WDM networks
[BibTeX] [DOI] [PDF] [plain text citation] |
2001 |
Photonic Netw. Commun. Vol. 3 (1-2), pp. 23-40 |
article |
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| D. Colle, P. Van Heuven, C. Develder, S. Van den Berghe, I. Lievens, M. Pickavet and P. Demeester, "MPLS recovery mechanisms for IP-over-WDM networks", Photonic Netw. Commun., Vol. 3, No. 1-2, Jan. 2001, pp. 23-40. doi:10.1023/A:1011479509986 | ||||
| Colle, D.; Van Heuven, P.; Groebbens, A.; Develder, C.; Pickavet, M. & Demeester, P. |
Dimensioning IP-over-WDM networks
[BibTeX] [PDF] [plain text citation] |
2000 | Proc. IP over DWDM Conf. | inproceedings |
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| D. Colle, P. Van Heuven, A. Groebbens, C. Develder, M. Pickavet and P. Demeester, "Dimensioning IP-over-WDM networks", in Proc. IP over DWDM Conf., Paris, France, 27-30 Nov. 2000. | ||||
| De Leenheer, M.; Buysse, J.; Develder, C.; Dhoedt, B. & Demeester, P. |
Design of multi-granular optical networks
[BibTeX] [PDF] [plain text citation] |
2009 | Proc. Eur. Conf. on Netw. and Optical Commun., in conjunction with 4th Conf. on Optical Cabling and Infrastructure (NOC/OC&I), pp. 107-114 | inproceedings |
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| M. De Leenheer, J. Buysse, C. Develder, B. Dhoedt and P. Demeester, "Design of multi-granular optical networks", in Proc. Eur. Conf. on Netw. and Optical Commun., in conjunction with 4th Conf. on Optical Cabling and Infrastructure (NOC/OC&I), Valladolid, Spain, 10-12 Jun. 2009, pp. 107-114. | ||||
| De Leenheer, M.; Buysse, J.; Develder, C. & Mukherjee, B. |
Isolation and Resource Efficiency of Virtual Optical Networks
[Abstract] [BibTeX] [PDF] [plain text citation] |
2012 | Proc. Int. Conf. Computing, Networking and Communications (ICNC 2012) | inproceedings |
| Abstract: Virtualization of optical networking infrastructure is considered a fundamental technology in the future Internet. A key principle is that virtual networks are isolated to coexist on a shared physical substrate without interference. Although a very attractive proposition for virtual network operators and users, in this paper we demonstrate that realizing complete isolation by partitioning resources is wasteful. Therefore, we propose to group virtual network requests in clusters: within a cluster, bandwidth can be shared, whereas different cluster are properly isolated. Results indicate that intelligent isolation and design of virtual networks can lead to substantial savings of optical network resources compared to a fully isolated approach. Finally, we demonstrate the trade-off between network resource utilization and control plane scalability. | ||||
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| M. De Leenheer, J. Buysse, C. Develder and B. Mukherjee, "Isolation and Resource Efficiency of Virtual Optical Networks", in Proc. Int. Conf. Computing, Networking and Communications (ICNC 2012), Maui, Hawaii, USA, 30 Jan. - 2 Feb. 2012. | ||||
| De Leenheer, M.; Buysse, J.; Mets, K.; Dhoedt, B. & Develder, C. |
Design and Implementation of a Simulation Environment for Network Virtualization
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 | Proc. 16th IEEE Int. Workshop Computer Aided Modeling, Analysis and Design of Commun. Links and Netw. (CAMAD 2011), pp. 87-91 | inproceedings |
| Abstract: Network virtualization has been proposed as a key enabler of the future internet, as it allows multiple networks to coexist on a shared physical infrastructure, and as such overcomes the difficulties in deploying novel technologies in the current Internet. However, much confusion still exists on the impact virtualization will have on performance, since we lack the necessary tools to study the behaviour of a virtualized network infrastructure. We report on the architecture and implementation of a simulation environment for virtualizing both (optical) network and IT infrastructures. We provide a detailed overview of the layered architecture, give insight in the design and implementation of the simulator, discuss potential use cases and finally include some preliminary results. | ||||
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| M. De Leenheer, J. Buysse, K. Mets, B. Dhoedt and C. Develder, "Design and Implementation of a Simulation Environment for Network Virtualization", in Proc. 16th IEEE Int. Workshop Computer Aided Modeling, Analysis and Design of Commun. Links and Netw. (CAMAD 2011), Kyoto, Japan, 10-11 Jun. 2011, pp. 87-91. doi:10.1109/CAMAD.2011.5941124 | ||||
| De Leenheer, M.; Develder, C.; Buysse, J.; Dhoedt, B. & Demeester, P. |
Dimensioning of combined OBS/OCS networks
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2008 | Proc. 5th Int. Conf. on Broadband Communications, Networks and Systems (Broadnets 2008), pp. 126-130 | inproceedings |
| Abstract: To cope with ever-increasing traffic demands in transport networks, all-optical switching is currently perceived as a potential solution to remove bottlenecks caused by optoelectronic conversions. An effective realization of this concept must support a wide range of traffic patterns, while remaining feasible to construct and deploy both in an economical and practical sense. In this paper, we propose the use of multi-granular optical cross-connects (MG-OXC), which support switching on both the wavelength and sub-wavelength level. To this end, the MG-OXCs are equipped with cheap, highly scalable slow switching fabrics, as well as a small number of expensive fast switching ports. The main goal of this work is to motivate the use of multi-granular switching, as this can reduce total network installation costs. To this end, we introduce an Integer Linear Programming model, and our evaluation demonstrates that multi-granular optical switching can be a cost-effective solution on the network level, in comparison to slow only or fast only approaches. Furthermore, we can achieve reduced costs of individual OXC nodes, which allows us to minimize scalability problems corresponding to emerging fast switching fabrics. | ||||
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| M. De Leenheer, C. Develder, J. Buysse, B. Dhoedt and P. Demeester, "Dimensioning of combined OBS/OCS networks", in Proc. 5th Int. Conf. on Broadband Communications, Networks and Systems (Broadnets 2008), London, UK, 8-11 Sep. 2008, pp. 126-130. doi:10.1109/BROADNETS.2008.4769055 | ||||
| De Leenheer, M.; Develder, C.; Dhoedt, B. & Demeester, P. |
Dimensioning of multi-granular optical networks
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2008 | Proc. 34th European Conf. on Optical Commun. (ECOC 2008) | inproceedings |
| Abstract: We present an ILP model for dimensioning optical networks that support wavelength and sub-wavelength switching. Results indicate significant reductions in cost and node-complexity with such multi-granular networks. | ||||
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| M. De Leenheer, C. Develder, B. Dhoedt and P. Demeester, "Dimensioning of multi-granular optical networks", in Proc. 34th European Conf. on Optical Commun. (ECOC 2008), Brussels, Belgium, 21-25 Sep. 2008. doi:10.1109/ECOC.2008.4729521 | ||||
| De Leenheer, M.; Develder, C.; Vermeir, J.; Buysse, J.; De Turck, F.; Dhoedt, B. & Demeester, P. |
Performance analysis of a hybrid optical switch
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2008 | Proc. Int. Conf. on Optical Network Design and Modelling (ONDM 2008), pp. 37-42 | inproceedings |
| Abstract: To cope with ever-increasing traffic demands in transport networks, all-optical switching is currently perceived as a solution to remove bottlenecks imposed by O/E/O conversions during data transfer. The successful realization of this concept is in large part dependent on the optical switch, which must support a wide range of traffic patterns, while remaining feasible to build both in an economical and practical sense. In this paper, we show a generic design for a hybrid optical switch composed of both slow and fast switching fabrics, and present a performance analysis to provide deeper insight in its behaviour. To this end, we propose and evaluate scheduling algorithms required at the edge of the network to map traffic on the different portions of the core switch, and present a simulation analysis covering a wide range of traffic parameters and switch design choices. These results show the effectiveness of the hybrid switch in catering for short-lived circuits (bursts) by only a limited amount of costly high-speed switching components. | ||||
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| M. De Leenheer, C. Develder, J. Vermeir, J. Buysse, F. De Turck, B. Dhoedt and P. Demeester, "Performance analysis of a hybrid optical switch", in Proc. Int. Conf. on Optical Network Design and Modelling (ONDM 2008), Catalonia, Spain, 12-14 Mar. 2008, pp. 37-42. doi:10.1109/ONDM.2008.4578401 | ||||
| De Leenheer, M.; Buysse, J.; Develder, C.; Dhoedt, B. & Demeester, P. |
Deflection routing in anycast-based OBS grids
[Abstract] [BibTeX] [PDF] [plain text citation] |
2009 | Proc. Int. Workshop on Optical Burst/Packet Switching (WOBS), in conjunction with Broadnets 2009 | inproceedings |
| Abstract: Deflection routing is a much-studied contention resolution technique in the context of Optical Burst/Packet Switching networks, as it promises to improve burst blocking performance and may reduce or even eliminate buffer requirements. An OBSbased Grid is frequently based on anycast routing, which holds even greater potential to use the deflection technique for succesful delivery of Grid jobs. As such, we propose an extension to deflection routing whereby jobs are rescheduled, to improve job blocking probabilities under various traffic parameters. We present a case study and perform simulation analysis to demonstrate the effectiveness of our proposal. | ||||
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| M. De Leenheer, J. Buysse, C. Develder, B. Dhoedt and P. Demeester, "Deflection routing in anycast-based OBS grids", in Proc. Int. Workshop on Optical Burst/Packet Switching (WOBS), in conjunction with Broadnets 2009, Madrid, Spain, 14 Sep. 2009. | ||||
| De Leenheer, M.; Develder, C.; Buysse, J.; Dhoedt, B. & Demeester, P. |
Performance analysis and dimensioning of multi-granular optical networks
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2009 |
Opt. Switch. and Netw. Vol. 6 (2), pp. 88-98 |
article |
| Abstract: Recent years have demonstrated the limited scalability of electronic switching to realize transport networks. In response, all-optical switching has been identified as a candidate solution to enable high-capacity networking in the future. One of the fundamental challenges is to efficiently support a wide range of traffic patterns, and thus emerges the need for equipment that is both practical and economical to construct and deploy. We have previously proposed the use of multi-granular optical cross-connects (MG-OXC), which support switching on both the wavelength and sub-wavelength level. To this end, the MG-OXCs are equipped with cheap, highly scalable slow switching fabrics, as well as a small number of expensive fast switching ports. The goal of this work is two-fold: first to demonstrate that a small number of fast switching ports suffices to support a wide range of traffic requirements, and second that multi-granular optical switching can offer cost-benefits on a network-wide scale. The first objective is studied through simulation analysis of a single switching node, and results indicate that a limited number of fast switching ports can significantly improve burst blocking performance over slow only switches. Furthermore, under certain circumstances, the MG-OXC can even approach the performance of a fast only switch design. Secondly, we introduce an Integer Linear Programming model for the total network installation cost, and our evaluation indicates that multi-granular optical switching can be a cost-effective solution on the network level, in comparison to slow only or fast only approaches. Furthermore, we can achieve reduced costs of individual OXC nodes, which allows us to minimize scalability problems corresponding to emerging fast switching fabrics. | ||||
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| M. De Leenheer, C. Develder, J. Buysse, B. Dhoedt and P. Demeester, "Performance analysis and dimensioning of multi-granular optical networks", Opt. Switch. and Netw., Vol. 6, No. 2, Apr. 2009, pp. 88-98. doi:10.1016/j.osn.2009.02.006 | ||||
| De Leenheer, M.; Develder, C.; De Turck, F.; Dhoedt, B. & Demeester, P. |
Erlang reduced load model for optical burst switched grids
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2007 | Proc. 3rd Int. Conf. Networking and Services (ICNS 2007) | inproceedings |
| Abstract: This paper presents an Erlang reduced load model to analyze optical burst switched grid networks. The model allows the evaluation of job blocking probabilities, in which blocking occurs in both the transport network and the resources where jobs are processed. Additionally, a novel routing strategy is introduced to improve the usage efficiency of the existing infrastructure. Simulation analysis is used to confirm the validity and accuracy of the model, and the effectiveness of the novel routing strategy is shown for grids over OBS. | ||||
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| M. De Leenheer, C. Develder, F. De Turck, B. Dhoedt and P. Demeester, "Erlang reduced load model for optical burst switched grids", in Proc. 3rd Int. Conf. Networking and Services (ICNS 2007), Athens, Greece, 19-25 Jun. 2007. doi:10.1109/ICNS.2007.62 | ||||
| De Leenheer, M.; Develder, C.; Stevens, T.; Dhoedt, B.; Pickavet, M. & Demeester, P. |
Design and control of optical Grid networks (Invited)
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2007 | Proc. 4th Int. Conf. on Broadband Networks (Broadnets 2007), pp. 107-115 | inproceedings |
| Abstract: Grid computing aims to realize a high-performance computing environment, while increasing the usage efficiency of installed resources. This puts considerable constraints on the network technology, and ultimately has led to the development of Grids over optical networks. In this paper, we investigate the fundamental question of how to optimize the performance of such Grid networks. We start with an analysis of different architectural approaches (and their respective technological choices) to integrate Grid computing with optical networks. This results in models and algorithms to design optical Grid networks, and we show the importance to combine both dimensioning (offline) and scheduling (online) in the design phase of such systems. Finally, the concept of anycast routing is introduced and motivated. Both exact and heuristic algorithms are proposed, and their performance in terms of blocking probability and latency is presented. | ||||
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| M. De Leenheer, C. Develder, T. Stevens, B. Dhoedt, M. Pickavet and P. Demeester, "Design and control of optical Grid networks (Invited)", in Proc. 4th Int. Conf. on Broadband Networks (Broadnets 2007), Raleigh, NC, 10-14 Sep. 2007, pp. 107-115. doi:10.1109/BROADNETS.2007.4550413 | ||||
| De Maesschalck, S.; Colle, D.; Groebbens, A.; Develder, C.; Lievens, A.; Lagasse, P.; Pickavet, M.; Demeester, P.; Saluta, F. & Quagliatti, M. |
Intelligent optical networking for multilayer survivability
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2002 |
IEEE Commun. Mag. Vol. 40 (1), pp. 42-49 |
article |
| Abstract: In recent years, telecommunication networks have faced explosive (IP) traffic growth. As traffic keeps growing, network reliability gains more and more importance. This article investigates to which extent switched connections and fast connection provisioning, typical for intelligent optical networks (IONs), can be used to provide resilience in an IP-over-optical multilayer network scenario. This solution, based on transport network flexibility, is compared with more traditional static multilayer resilience schemes in terms of cost (capacity) requirements and operational (dis)advantages | ||||
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| S. De Maesschalck, D. Colle, A. Groebbens, C. Develder, A. Lievens, P. Lagasse, M. Pickavet, P. Demeester, F. Saluta and M. Quagliatti, "Intelligent optical networking for multilayer survivability", IEEE Commun. Mag., Vol. 40, No. 1, Jan. 2002, pp. 42-49. doi:10.1109/35.978048 | ||||
| Demeester, P.; Ackaert, A.; Baert, E.; Cheyns, J.; De Maesschalck, S.; Develder, C.; Groebbens, A.; Pickavet, M.; Van Breusegem, E. & Verbrugge, S. |
Optical networking: basic concepts and recent evolutions (Invited)
[BibTeX] [PDF] [plain text citation] |
2002 | Proc. 28th European Conf. on Optical Commun. (ECOC 2002) | inproceedings |
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| P. Demeester, A. Ackaert, E. Baert, J. Cheyns, S. De Maesschalck, C. Develder, A. Groebbens, M. Pickavet, E. Van Breusegem and S. Verbrugge, "Optical networking: basic concepts and recent evolutions (Invited)", in Proc. 28th European Conf. on Optical Commun. (ECOC 2002), Copenhagen, Denmark, 8-12 Sep. 2002. | ||||
| Demeester, P.; Colle, D.; De Maesschalck, S.; Develder, C.; Pickavet, M. & Van Heuven, P. |
Resilience in IP over WDM based multilayer networks (Invited)
[BibTeX] [PDF] [plain text citation] |
2000 | Proc. 26th Eur. Conf. Optical Commun. (ECOC 2000) | inproceedings |
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| P. Demeester, D. Colle, S. De Maesschalck, C. Develder, M. Pickavet and P. Van Heuven, "Resilience in IP over WDM based multilayer networks (Invited)", in Proc. 26th Eur. Conf. Optical Commun. (ECOC 2000), Munich, Germany, 3-7 Sep. 2000. | ||||
| Demeester, P.; Colle, D.; De Maesschalck, S.; Develder, C.; Pickavet, M. & Van Heuven, P. |
Resilience in IP-over-WDM based multilayer networks (Invited)
[BibTeX] [PDF] [plain text citation] |
2000 | Proc. Optical Networks | inproceedings |
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| P. Demeester, D. Colle, S. De Maesschalck, C. Develder, M. Pickavet and P. Van Heuven, "Resilience in IP-over-WDM based multilayer networks (Invited)", in Proc. Optical Networks, Götheborg, Sweden, 7 Dec. 2000. | ||||
| Demeester, P.; De Leenheer, M.; Develder, C.; Vermeir, J.; Stevens, T.; De Turck, F. & Dhoedt, B. |
Optical grid networks (Invited)
[BibTeX] [PDF] [plain text citation] |
2007 | Proc. 11th Int. IFIP TC6 Conf. on Optical Netw. Design and Modeling (ONDM2007), pp. 127-136 | inproceedings |
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| P. Demeester, M. De Leenheer, C. Develder, J. Vermeir, T. Stevens, F. De Turck and B. Dhoedt, "Optical grid networks (Invited)", in Proc. 11th Int. IFIP TC6 Conf. on Optical Netw. Design and Modeling (ONDM2007), Athens, Greece, 29-31 May 2007, pp. 127-136. | ||||
| Develder, C.; Buysse, J.; De Leenheer, M.; Jaumard, B. & Dhoedt, B. |
Resilient network dimensioning for optical grid/clouds using relocation (Invited Paper)
[Abstract] [BibTeX] [PDF] [plain text citation] |
2012 | Proc. Workshop on New Trends in Optical Networks Survivability, at IEEE Int. Conf. on Commun. (ICC 2012) | inproceedings |
| Abstract: In this paper we address the problem of dimensioning infrastructure, comprising both network and server resources, for large-scale decentralized distributed systems such as grids or clouds. We will provide an overview of our work in this area, and in particular focus on how to design the resulting grid/cloud to be resilient against network link and/or server site failures. To this end, we will exploit relocation: under failure conditions, a request may be sent to an alternate destination than the one under failure-free conditions. We will provide a comprehensive overview of related work in this area, and focus in some detail on our own most recent work. The latter comprises a case study where traffic has a known origin, but we assume a degree of freedom as to where its end up being processed, which is typically the case for e.g., grid applications of the bag-of-tasks (BoT) type or for providing cloud services. In particular, we will provide in this paper a new integer linear programming (ILP) formulation to solve the resilient grid/cloud dimensioning problem using failure-dependent backup routes. Our algorithm will simultaneously decide on server and network capacity. We find that in the anycast routing problem we address, the benefit of using failure-dependent (FD) rerouting is limited compared to failure-independent (FID) backup routing. We confirm our earlier findings in terms of network capacity savings achieved by relocation compared to not exploiting relocation (order of 6–10% in the current case studies). | ||||
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| C. Develder, J. Buysse, M. De Leenheer, B. Jaumard and B. Dhoedt, "Resilient network dimensioning for optical grid/clouds using relocation (Invited Paper)", in Proc. Workshop on New Trends in Optical Networks Survivability, at IEEE Int. Conf. on Commun. (ICC 2012), Ottawa, Ontario, Canada, 11 Jun. 2012. | ||||
| Develder, C.; Buysse, J.; De Leenheer, M. & Dhoedt, B. |
Dimensioning resilient optical Grids
[BibTeX] [DOI] [PDF] [plain text citation] |
2009 | Proc. 5th Reliability Issues in Next Gen. Optical Netw. Workshop (RONEXT), co-located with 11th Int. Conf. on Transparent Optical Netw. (ICTON) | inproceedings |
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| C. Develder, J. Buysse, M. De Leenheer and B. Dhoedt, "Dimensioning resilient optical Grids", in Proc. 5th Reliability Issues in Next Gen. Optical Netw. Workshop (RONEXT), co-located with 11th Int. Conf. on Transparent Optical Netw. (ICTON), Island of São Miguel, Azores, Portugal, 28 Jun.-2 Jul. 2009. doi:10.1109/ICTON.2009.5185140 | ||||
| Develder, C.; Buysse, J.; Shaikh, A.; Jaumard, B.; De Leenheer, M. & Dhoedt, B. |
Survivable optical grid dimensioning: anycast routing with server and network failure protection
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 | Proc. IEEE Int. Conf. Commun. (ICC 2011) | inproceedings |
| Abstract: Grids can efficiently deal with challenging computational and data processing tasks which cutting edge science is generating today. So-called e-Science grids cope with these complex tasks by deploying geographically distributed server infrastructure, interconnected by high speed networks. The latter benefit from optical technology, offering low latencies and high bandwidths, thus giving rise to so-called optical grids or lambda grids. In this paper, we address the dimensioning problem of such grids: how to decide how much server infrastructure to deploy, at which locations in a given topology, the amount of network capacity to provide and which routes to follow along them. Compared to earlier work, we propose an integrated solution solving these questions in an integrated way, i.e., we jointly optimize network and server capacity, and incorporate resiliency against both network and server failures. Assuming we are given the amount of resource reservation requests arriving at each network node (where a resource reservation implies to reserve both processing capacity at a server site, and a network connection towards it), we solve the problem of first choosing a predetermined number of server locations to use, and subsequently determine the routes to follow while minimizing resource requirements. In a case study on a meshed European network comprising 28 nodes and 41 links, we show that compared to classical (i.e. without relocation) shared path protection against link failures only, we can offer resilience against both single link and network failures by adding about 55% extra server capacity, and 26% extra wavelengths. |
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| C. Develder, J. Buysse, A. Shaikh, B. Jaumard, M. De Leenheer and B. Dhoedt, "Survivable optical grid dimensioning: anycast routing with server and network failure protection", in Proc. IEEE Int. Conf. Commun. (ICC 2011), Kyoto, Japan, 5-9 Jun. 2011. doi:10.1109/icc.2011.5963385 | ||||
| Develder, C.; Cheyns, J.; Pickavet, M. & Demeester, P. |
Multistage architectures for optical packet switching using SOA-based broadcast-and-select switches
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2003 |
Vol. 2 Proc. Optical Fiber Commun./National Fiber Optic Engineers Conf. (OFC/NFOEC 2003), pp. 794-795 |
inproceedings |
| Abstract: Optical packet/burst switches can be scaled to high port counts using multistage architectures. To reduce the number of switching elements in SOA-based broadcast-and-select architectures, we deploy only a few stages while exploiting the WDM dimension. | ||||
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| C. Develder, J. Cheyns, M. Pickavet and P. Demeester, "Multistage architectures for optical packet switching using SOA-based broadcast-and-select switches", Vol. 2, in Proc. Optical Fiber Commun./National Fiber Optic Engineers Conf. (OFC/NFOEC 2003), Atlanta, GA, USA, 23-28 Feb. 2003, pp. 794-795. doi:10.1109/OFC.2003.1248577 | ||||
| Develder, C.; Cheyns, J.; Pickavet, M. & Demeester, P. |
Service differentiation mechanisms for variable length packets in an optical switch with recirculating FDL buffer
[BibTeX] [PDF] [plain text citation] |
2003 | Proc. Photonics in Switching (PS 2003), pp. 92-94 (paper PS.Mo.C8) | inproceedings |
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| C. Develder, J. Cheyns, M. Pickavet and P. Demeester, "Service differentiation mechanisms for variable length packets in an optical switch with recirculating FDL buffer", in Proc. Photonics in Switching (PS 2003), Versailles, France, 28 Sep.-2 Oct. 2003, pp. 92-94 (paper PS.Mo.C8). | ||||
| Develder, C.; Cheyns, J.; Van Breusegem, E.; Baert, E.; Ackaert, A.; Pickavet, M. & Demeester, P. |
Node architectures for optical packet and burst switching (Invited)
[BibTeX] [PDF] [plain text citation] |
2002 | Proc. Photonics in Switching (PS 2002), pp. 104-106 (paper PS.WeA1) | inproceedings |
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| C. Develder, J. Cheyns, E. Van Breusegem, E. Baert, A. Ackaert, M. Pickavet and P. Demeester, "Node architectures for optical packet and burst switching (Invited)", in Proc. Photonics in Switching (PS 2002), Jeju Island, South Korea, 21-25 Jul. 2002, pp. 104-106 (paper PS.WeA1). | ||||
| Develder, C.; Cheyns, J.; Van Breusegem, J.; Baert, E.; Colle, D.; Pickavet, M. & Demeester, P. |
Architectures for optical packet and burst switches (Invited)
[BibTeX] [PDF] [plain text citation] |
2003 | Proc. 29th Eur. Conf. Optical Commun. (ECOC 2003), pp. 376-377 (paper We.1.4.4) | inproceedings |
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| C. Develder, J. Cheyns, J. Van Breusegem, E. Baert, D. Colle, M. Pickavet and P. Demeester, "Architectures for optical packet and burst switches (Invited)", in Proc. 29th Eur. Conf. Optical Commun. (ECOC 2003), Rimini, Italy, 21-25 Sep. 2003, pp. 376-377 (paper We.1.4.4). | ||||
| Develder, C.; Colle, D.; De Maesschalck, S.; Pickavet, M. & Demeester, P. |
Influence of GMPLS recovery mechanisms on TCP performance
[BibTeX] [DOI] [PDF] [plain text citation] |
2002 |
Photonic Netw. Commun. Vol. 4 (3-4), pp. 321-345 |
article |
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| C. Develder, D. Colle, S. De Maesschalck, M. Pickavet and P. Demeester, "Influence of GMPLS recovery mechanisms on TCP performance", Photonic Netw. Commun., Vol. 4, No. 3-4, Jul.-Dec. 2002, pp. 321-345. doi:10.1023/A:1016064014931 | ||||
| Develder, C.; Colle, D.; Van Heuven, P.; Van den Berghe, S.; Pickavet, M. & Demeester, P. |
Influence of recovery time on TCP behaviour
[BibTeX] [PDF] [plain text citation] |
2001 | Proc. MPLS World Congress | inproceedings |
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| C. Develder, D. Colle, P. Van Heuven, S. Van den Berghe, M. Pickavet and P. Demeester, "Influence of recovery time on TCP behaviour", in Proc. MPLS World Congress, Paris, France, 6-9 Feb. 2001. | ||||
| Develder, C.; De Leenheer, M.; Dhoedt, B.; Pickavet, M.; Colle, D.; De Turck, F. & Demeester, P. |
Optical networks for grid and cloud computing applications
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2012 |
Proc. IEEE Vol. 100 (5), pp. 1149-1167 |
article |
| Abstract: The evolution towards grid and cloud computing as observed for over a decennium illustrates the crucial role played by (optical) networks in supporting today’s applications. In this paper, we start from an overview of the challenging applications in both academic (further referred to as scientific), enterprise (business) and non-professional user (consumer) domains. They pose novel challenges, calling for efficient interworking of IT resources, for both processing and storage, as well as the network that interconnects them and provides access to their users. We outline those novel applications’ requirements, including sheer performance attributes (which will determine the quality as perceived by end users of the cloud applications), as well as the ability to adapt to changing demands (usually referred to as elasticity) and possible failures (i.e., resilience). In outlining the foundational concepts that provide the building blocks for grid/cloud solutions that meet the stringent application requirements we highlight, a prominent role is played by optical networking. The pieces of the solution studied in this respect span the optical transport layer as well as mechanisms located in higher layers (e.g., anycast routing, virtualization), and their interworking (e.g. through appropriate control plane extensions and middleware). Based on this study, we conclude by identifying challenges and research opportunities that can enable future-proof optical cloud systems (e.g., pushing the virtualization paradigms to optical networks). | ||||
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| C. Develder, M. De Leenheer, B. Dhoedt, M. Pickavet, D. Colle, F. De Turck and P. Demeester, "Optical networks for grid and cloud computing applications", Proc. IEEE, Vol. 100, No. 5, May 2012, pp. 1149-1167. doi:10.1109/JPROC.2011.2179629 | ||||
| Develder, C.; De Leenheer, M.; Stevens, T.; Baert, J.; Thysebaert, P.; De Turck, F.; Dhoedt, B. & Demeester, P. |
Delivering the grid promise with optical burst switching (Invited)
[BibTeX] [PDF] [plain text citation] |
2006 | Proc. Int. Workshop on Optical Burst/Packet Switching (WOBPS East 2006), at the Joint Int. Conf. on Optical INternet and Next Generation Netwerks (COIN-NGN 2006) | inproceedings |
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| C. Develder, M. De Leenheer, T. Stevens, J. Baert, P. Thysebaert, F. De Turck, B. Dhoedt and P. Demeester, "Delivering the grid promise with optical burst switching (Invited)", in Proc. Int. Workshop on Optical Burst/Packet Switching (WOBPS East 2006), at the Joint Int. Conf. on Optical INternet and Next Generation Netwerks (COIN-NGN 2006), Jeju, South Korea, 9-13 Jul. 2006. | ||||
| Develder, C.; De Leenheer, M.; Stevens, T.; Dhoedt, B.; De Turck, F. & Demeester, P. |
Scheduling in optical grids: a dimensioning point of view
[BibTeX] [PDF] [plain text citation] |
2007 | Proc. Conf. on the Optical Internet - Australian Conference on Optical Fibre Technology (COIN-ACOFT) | inproceedings |
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| C. Develder, M. De Leenheer, T. Stevens, B. Dhoedt, F. De Turck and P. Demeester, "Scheduling in optical grids: a dimensioning point of view", in Proc. Conf. on the Optical Internet - Australian Conference on Optical Fibre Technology (COIN-ACOFT), Melbourne, Australia, 24-27 Jun. 2007. | ||||
| Develder, C.; De Leenheer, M.; Stevens, T.; Dhoedt, B.; Markidis, G. & Tzanakaki, A. |
Scalable impairment-aware anycast routing in multi-domain optical Grid networks
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2008 |
Vol. 3 Proc. 10th Int. Conf. on Transparent Optical Networks (ICTON 2008), pp. 150-153 |
inproceedings |
| Abstract: In optical grid networks, the main challenge is to account for not only network parameters, but also for resource availability. Anycast routing has previously been proposed as an effective solution to provide job scheduling services in optical grids, offering a generic interface to access grid resources and services. The main weakness of this approach is its limited scalability, especially in a multi-domain scenario. This paper proposes a novel anycast proxy architecture, which extends the anycast principle to a multi-domain scenario. The main purpose of the architecture is to perform aggregation of resource and network states, and as such improve computational scalability and reduce control plane traffic. Furthermore, the architecture has the desirable properties of allowing Grid domains to maintain their autonomy and hide internal configuration details from other domains. Finally, we propose an impairment-aware anycast routing algorithm that incorporates the main physical layer characteristics of large-scale optical networks into its path computation process. By integrating the proposed routing scheme into the introduced architecture we demonstrate significant network performance improvements. | ||||
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| C. Develder, M. De Leenheer, T. Stevens, B. Dhoedt, G. Markidis and A. Tzanakaki, "Scalable impairment-aware anycast routing in multi-domain optical Grid networks", Vol. 3, in Proc. 10th Int. Conf. on Transparent Optical Networks (ICTON 2008), Athens, Greece, 22-26 Jun. 2008, pp. 150-153. doi:10.1109/ICTON.2008.4598677 | ||||
| Develder, C.; De Leenheer, M.; Dhoedt, B. & Demeester, P. |
Evaluation of Optical Grid Scheduling through Dimensioning
[BibTeX] [PDF] [plain text citation] |
2007 | Proc. 33rd European Conf. and Exhibition on Optical Commun. (ECOC 2007) | inproceedings |
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| C. Develder, M. De Leenheer, B. Dhoedt and P. Demeester, "Evaluation of Optical Grid Scheduling through Dimensioning", in Proc. 33rd European Conf. and Exhibition on Optical Commun. (ECOC 2007), Berlin, Germany, 16-20 Sep. 2007. | ||||
| Develder, C.; Haerick, W.; Mets, K. & De Turck, F. |
Smart Grids and the role of ICT
[BibTeX] [PDF] [plain text citation] |
2010 | Proc. IEEE Smart Grid Comms Workshop, at IEEE Int. Conf. on Commun. (ICC 2010) | inproceedings |
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| C. Develder, W. Haerick, K. Mets and F. De Turck, "Smart Grids and the role of ICT", in Proc. IEEE Smart Grid Comms Workshop, at IEEE Int. Conf. on Commun. (ICC 2010), Cape Town, South Africa, 23 May 2010. | ||||
| Develder, C.; Lambert, P.; Van Lancker, W.; Moens, S.; Van de Walle, R.; Nelis, J.; Verslype, D.; Latré, S.; Staelens, N.; Vercammen, N.; Vermeulen, B.; Masschelein, B.; Van Leeuwen, T.; Macq, J.-F.; Struyve, K.; De Turck, F. & Dhoedt, B. |
Delivering scalable video with QoS to the home
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2012 |
Telecommun. Syst. Vol. 49 (1), pp. 129-148 |
article |
| Abstract: User satisfaction is a key factor in the success of novel multimedia services. Yet, to enable service providers and network operators to control and maximize the quality (QoS, QoE) of delivered video streams, quite some challenges remain. In this paper, we particularly focus on three of them. First of all, objectively measuring video quality requires appropriate quality metrics and methods of assessing them in a real-time fashion. Secondly, the recent Scalable Video Coding (SVC) format opens opportunities for adapting video to the available (network) resources, yet the appropriate configuration of video encoding as well as real-time streaming adaptation are largely unaddressed research areas. Thirdly, while bandwidth reservation mechanisms in access/core networks do exist, service providers lack a means for guaranteeing QoS in the increasingly complex home networks (which they are not in full control of). In this paper we offer a broad view on these interrelated issues, by presenting the developments originating in a Flemish research project (including proof-of-concept demonstrations). From a developmental perspective, we propose an architecture combining a real-time video quality monitoring platform, on-the-fly adaptation (optimizing the video quality) and QoS reservation in a heterogeneous home network based on UPnP QoS v3. From a research perspective, we propose a new subjective test procedure that revealed user preference for temporal scalability over quality scalability. In addition, an extensive study on optimizing HD SVC encoding in IPTV scenarios with fluctuating bandwidth showed that under certain bandwidth constraints (prohibiting sufficient fidelity) spatial scalability is a better option than quality scalability. | ||||
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| C. Develder, P. Lambert, W. Van Lancker, S. Moens, R. Van de Walle, J. Nelis, D. Verslype, S. Latré, N. Staelens, N. Vercammen, B. Vermeulen, B. Masschelein, T. Van Leeuwen, J.-F. Macq, K. Struyve, F. De Turck and B. Dhoedt, "Delivering scalable video with QoS to the home", Telecommun. Syst., Vol. 49, No. 1, Jan. 2012, pp. 129-148. doi:10.1007/s11235-010-9358-3 | ||||
| Develder, C.; Mukherjee, B.; Dhoedt, B. & Demeester, P. |
On dimensioning optical Grids and the impact of scheduling
[BibTeX] [DOI] [PDF] [plain text citation] |
2009 |
Photonic Netw. Commun. Vol. 17 (3), pp. 255-265 |
article |
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| C. Develder, B. Mukherjee, B. Dhoedt and P. Demeester, "On dimensioning optical Grids and the impact of scheduling", Photonic Netw. Commun., Vol. 17, No. 3, Jun. 2009, pp. 255-265. doi:10.1007/s11107-008-0160-z | ||||
| Develder, C.; Pickavet, M. & Demeester, P. |
On trains and wagons: switching variable length packets in a slotted OPS network
[BibTeX] [PDF] [plain text citation] |
2003 | Proc. Conf. on Optical Internet / Australian Conf. on Optical Fibre Technology (COIN/ACOFT 2003), pp. 233-236 (paper TuA2-6) | inproceedings |
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| C. Develder, M. Pickavet and P. Demeester, "On trains and wagons: switching variable length packets in a slotted OPS network", in Proc. Conf. on Optical Internet / Australian Conf. on Optical Fibre Technology (COIN/ACOFT 2003), Melbourne, Australia, 13-16 Jul. 2003, pp. 233-236 (paper TuA2-6). | ||||
| Develder, C.; Pickavet, M. & Demeester, P. |
Strategies for an FDL based feed-back buffer for an optical packet switch with QoS differentiation
[BibTeX] [PDF] [plain text citation] |
2002 | Proc. Conf. on Optical Internet (COIN2002), pp. 114-116 (paper COIN.TuD1) | inproceedings |
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| C. Develder, M. Pickavet and P. Demeester, "Strategies for an FDL based feed-back buffer for an optical packet switch with QoS differentiation", in Proc. Conf. on Optical Internet (COIN2002), Jeju Island, South Korea, 21-25 Jul. 2002, pp. 114-116 (paper COIN.TuD1). | ||||
| Develder, C.; Pickavet, M. & Demeester, P. |
Choosing an appropriate buffer strategy for an optical packet switch with a feed-back FDL buffer
[Abstract] [BibTeX] [NOTE] [PDF] [plain text citation] |
2002 |
Vol. 3 Proc. 28th European Conf. on Optical Commun. (ECOC 2002) |
inproceedings |
| Abstract: For an optical packet switch with a feed-back buffer consisting of Fibre Delay Lines (FDLs), we compare buffer configurations and strategies. We focus on achieved Packet Loss Ratio (PLR) for memoryless, bursty and self-similar traffic types. | ||||
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| C. Develder, M. Pickavet and P. Demeester, "Choosing an appropriate buffer strategy for an optical packet switch with a feed-back FDL buffer", Vol. 3, in Proc. 28th European Conf. on Optical Commun. (ECOC 2002), Copenhagen, Denmark, 8-12 Sep. 2002. | ||||
| Develder, C.; Pickavet, M. & Demeester, P. |
Assessment of packet loss for an optical packet router with recirculating buffer
[BibTeX] [PDF] [plain text citation] |
2002 | Proc. 6th IFIP Working Conf. on Optical Netw. Design and Modelling (ONDM2002) | inproceedings |
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| C. Develder, M. Pickavet and P. Demeester, "Assessment of packet loss for an optical packet router with recirculating buffer", in Proc. 6th IFIP Working Conf. on Optical Netw. Design and Modelling (ONDM2002), Torino, Italy, 4-6 Feb. 2002. | ||||
| Develder, C.; Pickavet, M.; Dhoedt, B. & Demeester, P. |
A power-saving strategy for Grids
[BibTeX] [PDF] [plain text citation] |
2008 | Proc. 2nd Int. Conf. on Networks for Grid Applications (GridNets 2008) | inproceedings |
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| C. Develder, M. Pickavet, B. Dhoedt and P. Demeester, "A power-saving strategy for Grids", in Proc. 2nd Int. Conf. on Networks for Grid Applications (GridNets 2008), Bejing, China, 8-10 Oct. 2008. | ||||
| Develder, C.; Stavdas, A.; Bianco, A.; Davide; Lonsethagen, H.; Gimenez, J.-P.; Van Caenegem, R.; Sygletos, S.; Neri, F.; Sole-Pareta, J.; Pickavet, M.; Le Sauze, N. & Demeester, P. |
Benchmarking and viability assessment of optical packet switching for metro networks
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2004 |
IEEE J. Lightwave Technol. Vol. 22 (11), pp. 2435-2451 |
article |
| Abstract: Optical packet switching (OPS) has been proposed as a strong candidate for future metro networks. This paper assesses the viability of an OPS-based ring architecture as proposed within the research project DAVID (Data And Voice Integration on DWDM), funded by the European Commission through the Information Society Technologies (IST) framework. Its feasibility is discussed from a physical-layer point of view, and its limitations in size are explored. Through dimensioning studies, we show that the proposed OPS architecture is competitive with respect to alternative metropolitan area network (MAN) approaches, including synchronous digital hierarchy, resilient packet rings (RPR), and star-based Ethernet. Finally, the proposed OPS architectures are discussed from a logical performance point of view, and a high-quality scheduling algorithm to control the packet-switching operations in the rings is explained. | ||||
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| C. Develder, A. Stavdas, A. Bianco, Davide, H. Lonsethagen, J.-P. Gimenez, R. Van Caenegem, S. Sygletos, F. Neri, J. Sole-Pareta, M. Pickavet, N. Le Sauze and P. Demeester, "Benchmarking and viability assessment of optical packet switching for metro networks", IEEE J. Lightwave Technol., Vol. 22, No. 11, Nov. 2004, pp. 2435-2451. doi:10.1109/JLT.2004.836773 | ||||
| Develder, C.; Van Caenegem, R.; Baert, E.; Pickavet, M. & Demeester, P. |
Active versus passive OPS architectures for metro rings: a network dimensioning point of view
[BibTeX] [PDF] [plain text citation] |
2003 |
Vol. 1 Proc. 29th Eur. Conf. Optical Commun. (ECOC 2003), pp. 100-103 (paper Mo.4.4.1) |
inproceedings |
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| C. Develder, R. Van Caenegem, E. Baert, M. Pickavet and P. Demeester, "Active versus passive OPS architectures for metro rings: a network dimensioning point of view", Vol. 1, in Proc. 29th Eur. Conf. Optical Commun. (ECOC 2003), Rimini, Italy, 21-25 Sep. 2003, pp. 100-103 (paper Mo.4.4.1). | ||||
| Develder, C.; Van Houdt, B.; Blondia, C.; Pickavet, M. & Demeester, P. |
Analytical MMAP-based bounds for packet loss in optical packet switching with recirculating FDL buffers
[BibTeX] [DOI] [PDF] [plain text citation] |
2004 |
Photonic Netw. Commun. Vol. 8 (2), pp. 149-161 |
article |
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| C. Develder, B. Van Houdt, C. Blondia, M. Pickavet and P. Demeester, "Analytical MMAP-based bounds for packet loss in optical packet switching with recirculating FDL buffers", Photonic Netw. Commun., Vol. 8, No. 2, Sep. 2004, pp. 149-161. doi:10.1023/B:PNET.0000033975.88406.28 | ||||
| Dittmann, L.; Develder, C.; Chiaroni, D.; Neri, F.; Callegati, F.; Koerber, W.; Stavdas, A.; Renaud, M.; Rafel, A.; Sole-Pareta, J.; Cerroni, W.; Leligou, N.; Dembeck, L.; Mortensen, B.; Pickavet, M.; Le Sauze, N.; Mahony, M.; Berde, B. & Eilenberger, G. |
The European IST project DAVID: a viable approach toward optical packet switching
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2003 |
IEEE J. Sel. Areas Commun. Vol. 21 (7), pp. 1026-1040 |
article |
| Abstract: In this paper, promising technologies and a network architecture are presented for future optical packet switched networks. The overall network concept is presented and the major choices are highlighted and compared with alternative solutions. Both long and shorter term approaches are considered, as well as both the wide-area network and multiple-area networks parts of the network. The results presented in this paper were developed in the frame of the research project DAVID (Data And Voice Integration over DWDM) project, funded by the European Commission through the IST-framework. | ||||
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| L. Dittmann, C. Develder, D. Chiaroni, F. Neri, F. Callegati, W. Koerber, A. Stavdas, M. Renaud, A. Rafel, J. Sole-Pareta, W. Cerroni, N. Leligou, L. Dembeck, B. Mortensen, M. Pickavet, N. Le Sauze, M. Mahony, B. Berde and G. Eilenberger, "The European IST project DAVID: a viable approach toward optical packet switching", IEEE J. Sel. Areas Commun., Vol. 21, No. 7, Sep. 2003, pp. 1026-1040. doi:10.1109/JSAC.2003.816388 | ||||
| Escalona, E.; Peng, S.; Nejabati, R.; Simeonidou, D.; García-Espín, J.A.; Ferrer, J.; Figuerola, S.; Landi, G.; Ciulli, N.; Jimenez, J.; Belter, B.; Demchenko, Y.; de Laat, C.; Chen, X.; Yukan, A.; Soudan, S.; Vicat-Blanc, P.; Buysse, J.; De Leenheer, M.; Develder, C.; Tzanakaki, A.; Robinson, P.; Brogle, M. & Bohnert, T.M. |
GEYSERS: A Novel Architecture for Virtualization and Co-Provisioning of Dynamic Optical Networks and IT Services
[Abstract] [BibTeX] [PDF] [plain text citation] |
2011 | Proc. Future Netw. Mobile Summit, pp. 1-8 | inproceedings |
| Abstract: GEYSERS aims at defining an end-to-end network architecture that offers a novel planning, provisioning and operational framework for optical network and IT infrastructure providers and operators. In this framework, physical infrastructure resources (network and IT) are dynamically partitioned to virtual resources and then composed into a Virtual Infrastructure offered to operators as a service. The operator will be able to operate a virtual infrastructure with an enhanced Network Control Plane (NCP) able to offer coupled, optimized and dynamic on-demand Network and IT provisioning services (i.e., interconnections between multiple IT resources and end-users). The scope and novelty of the GEYSERS architecture is focused on the functional definition and description of two innovative layers, the enhanced Network Control Plane (NCP) and the Logical Infrastructure Composition Layer (LICL). The Service Middleware Layer (SML) and the physical layer (PHY) are part of the overall GEYSERS architecture but are based on existing developments that will be appropriately adapted or extended. | ||||
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| E. Escalona, S. Peng, R. Nejabati, D. Simeonidou, J.A. García-Espín, J. Ferrer, S. Figuerola, G. Landi, N. Ciulli, J. Jimenez, B. Belter, Y. Demchenko, C. de Laat, X. Chen, A. Yukan, S. Soudan, P. Vicat-Blanc, J. Buysse, M. De Leenheer, C. Develder, A. Tzanakaki, P. Robinson, M. Brogle and T.M. Bohnert, "GEYSERS: A Novel Architecture for Virtualization and Co-Provisioning of Dynamic Optical Networks and IT Services", in Proc. Future Netw. Mobile Summit, Warsaw, Poland, 15-17 Jun. 2011, pp. 1-8. | ||||
| Groebbens, A.; Colle, D.; Develder, C.; De Maesschalck, S.; Pickavet, M. & Demeester, P. |
Use of backup trees to improve resource efficiency of MPLambdaS protection mechanisms
[BibTeX] [PDF] [plain text citation] |
2001 | Proc. 3rd Int. Workshop on Design of Reliable Commun. Netw. (DRCN 2001), pp. 152-159 | inproceedings |
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| A. Groebbens, D. Colle, C. Develder, S. De Maesschalck, M. Pickavet and P. Demeester, "Use of backup trees to improve resource efficiency of MPLambdaS protection mechanisms", in Proc. 3rd Int. Workshop on Design of Reliable Commun. Netw. (DRCN 2001), Budapest, Hungary, 7-10 Oct. 2001, pp. 152-159. | ||||
| Haerick, W.; Nelis, J.; Verslype, D.; Develder, C.; De Turck, F. & Dhoedt, B. |
Trust as Differentiator for Value-Adding Home Service Providers
[BibTeX] [DOI] [PDF] [plain text citation] |
2009 | Proc. 1st Int. Workshop on Comput.Trust for Self-Adaptive Systems (SelfTrust 2009), part of ComputationWorld 2009, pp. 693-700 | inproceedings |
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| W. Haerick, J. Nelis, D. Verslype, C. Develder, F. De Turck and B. Dhoedt, "Trust as Differentiator for Value-Adding Home Service Providers", in Proc. 1st Int. Workshop on Comput.Trust for Self-Adaptive Systems (SelfTrust 2009), part of ComputationWorld 2009, Athens, Greece, 15-20 Nov. 2009, pp. 693-700. doi:10.1109/ComputationWorld.2009.108 | ||||
| Haerick, W.; Wauters, T.; Develder, C.; De Turck, F. & Dhoedt, B. |
Transparent resource sharing framework for internet services on handheld devices
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2010 |
Ann. Telecommun. Vol. 65 (7-8), pp. 419-432 |
article |
| Abstract: Handheld devices have limited processing power and a short battery lifetime. As a result, computationally intensive applications cannot run appropriately or cause the device to run out of battery too early. Additionally, Internet-based service providers targeting these mobile devices lack information to estimate the remaining battery autonomy and have no view on the availability of idle resources in the neighborhood of the handheld device. These battery-related issues create an opportunity for Internet providers to broaden their role and start managing energy aspects of battery-driven mobile devices inside the home. In this paper, we propose an energy-aware resource-sharing framework that enables Internet access providers to delegate (a part of) a client application from a handheld device to idle resources in the LAN, in a transparent way for the end-user. The key component is the resource sharing service, hosted on the LAN gateway, which can be remotely queried and managed by the Internet access provider. The service includes a battery model to predict the remaining battery lifetime. We describe the concept of resource-sharing-as-a-service that allows users of handheld devices to subscribe to the resource sharing service. In a proof-of-concept, we evaluate the delay to offload a client application to an idle computer and study the impact on battery autonomy as a function of the CPU cycles that can be offloaded. | ||||
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| W. Haerick, T. Wauters, C. Develder, F. De Turck and B. Dhoedt, "Transparent resource sharing framework for internet services on handheld devices", Ann. Telecommun., Springer Paris, Vol. 65, No. 7-8, Aug. 2010, pp. 419-432. doi:10.1007/s12243-010-0168-0 | ||||
| Hoang, V.D.T.; Demeester, T.; Develder, C. & Shin, H. |
Effectiveness of learning to rank for finding user similarity in social media
[Abstract] [BibTeX] [PDF] [plain text citation] |
2012 | Proc. 12th Dutch-Belgian Information Retrieval Workshop (DIR 2012), pp. 30-33 | inproceedings |
| Abstract: This paper focuses on an automatic and accurate approach for finding similar users in social networks. Many types of social networks could benefit from such techniques, but the focus in this paper is on online photo services. The similarity between users needs to be considered on two different levels, i.e., the semantic similarity (or correspondence in tagging behavior), and the similarity in terms of social relations. In recent work, heuristic formulas were introduced for the tag commonness (TC) and the link strength (LS), with an adaptive combination scheme to describe how relevant each of these similarity aspects are for particular users, in order to define the user similarity. This paper presents an experiment, where a Learning-to-Rank approach is used to find suitable combinations of TC and LS related parameter values, hence taking into account the proficiency of users to tag their photos, and their noticeability in the online community, in order to obtain an overall user similarity. The user experiments show that the results with this learning-to-rank approach are significantly better than with a former, heuristic, approach. | ||||
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| V.D.T. Hoang, T. Demeester, C. Develder and H. Shin, "Effectiveness of learning to rank for finding user similarity in social media", in Proc. 12th Dutch-Belgian Information Retrieval Workshop (DIR 2012), Ghent, Belgium, 23-24 Feb. 2012, pp. 30-33. | ||||
| Jaumard, B.; Buysse, J.; Shaikh, A.; De Leenheer, M. & Develder, C. |
Column Generation for Dimensioning Resilient Optical Grid Networks with Relocation
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2010 | Proc. IEEE Global Telecommun. Conf. (Globecom 2010), pp. 1-6 | inproceedings |
| Abstract: Nowadays, the Quality of Service (QoS) in Optical Grids has become a key issue. An important QoS factor is resiliency, namely the ability to survive from certain network failures. Although several traditional network protection schemes were devised in the past, they are not optimized for Optical Grids. In an earlier work, we proposed relocation strategies providing backup paths to alternate destinations, exploiting the anycast routing principle of grids. To show the advantage of relocation (compared to traditional network protection) in terms of reduced network capacity, we formulated the network dimensioning problem as an Integer Linear Program (ILP). Yet, its solution exhibited very poor scalability and appeared not practical for reasonably large scale case studies. Therefore, we propose a novel formulation for the relocation protection scheme, using column generation (CG). This approach decomposes the original ILP into two parts, specifically a Restricted Master Problem (RMP) and a Pricing Problem (PP) which are iteratively and alternatively solved until the optimality condition is satisfied. Such a CG decomposition has a significant impact on the complexity of the model, leading to a significant improvement over previous ILPs in term of scalability and running times. We demonstrate that the CG method is highly scalable and generates nearly optimal solutions using case studies with up to 300 connections, showing it to be highly competitive with a previously proposed heuristic. We also perform some comparisons of the anycast scheme with the classical shared path protection on larger network instances. | ||||
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| B. Jaumard, J. Buysse, A. Shaikh, M. De Leenheer and C. Develder, "Column Generation for Dimensioning Resilient Optical Grid Networks with Relocation", in Proc. IEEE Global Telecommun. Conf. (Globecom 2010), Miami, FL, USA, 6-10 Dec. 2010, pp. 1-6. doi:10.1109/GLOCOM.2010.5684026 | ||||
| de Laat, C.T.A.M.; Develder, C.; Jukan, A. & Mambretti, J. |
Introduction
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2009 | 15th Int. Euro-Par Conf. Parallel Processing (Euro-Par 2009), pp. 1013-1014 | inproceedings |
| Abstract: his topic is devoted to communication issues in scalable compute and storage systems, such as parallel computers, networks of workstations, and clusters. All aspects of communication in modern systems were solicited, including advances in the design, implementation, and evaluation of interconnection networks, network interfaces, system and storage area networks, on-chip interconnects, communication protocols, routing and communication algorithms, and communication aspects of parallel and distributed algorithms. In total 15 papers were submitted to this topic of which we selected the 7 strongest papers. We grouped the papers in two sessions of 3 papers each and one paper was selected for the best paper session. We noted a number of papers dealing with changing topologies, stability and forwarding convergence in source routing based cluster interconnect network architectures. We grouped these for the first session. The authors of the paper titled: “Implementing a Change Assimilation Mechanism for Source Routing Interconnects” propose a mechanism that can obtain the new topology, and compute and distribute a new set of fabric paths to the source routed network end points to minimize the impact on the forwarding service. The article entitled “Dependability Analysis of a Fault-tolerant Network Reconfiguration Strateg” reports on a case study analyzing the effects of network size, mean time to node failure, mean time to node repair, mean time to network repair and coverage of the failure when using a 2D mesh network with a fault-tolerant mechanism (similar to the one used in the BlueGene/L system), that is able to remove rows and/or columns in the presence of failures. The last paper in this session: “RecTOR: A New and Efficient Method for Dynamic Network Reconfiguration” presents a new dynamic reconfiguration method, that ensures deadlock-freedom during the reconfiguration without causing performance degradation such as increased latency or decreased throughput. The second session groups 3 papers presenting methods, protocols and architectures that enhance capacities in the Networks. The paper titled: “NIC-assisted Cache-Efficient Receive Stack for Message Passing over Ethernet” presents the addition of multiqueue support in the Open-MX receive stack so that all incoming packets for the same process are treated on the same core. It then introduces the idea of binding the target end process near its dedicated receive queue. In general this multiqueue receive stack performs better than the original single queue stack, especially on large communication patterns where multiple processes are involved and manual binding is difficult. The authors of: “A Multipath Fault-Tolerant Routing Method for High-Speed Interconnection Networks” focus on the problem of fault tolerance for high-speed interconnection networks by designing a fault tolerant routing method. The goal was to solve a certain number of link and node failures, considering its impact, and occurrence probability. Their experiments show that their method allows applications to successfully finalize their execution in the presence of several faults, with an average performance value of 97% with respect to the fault-free scenarios. The paper: “Hardware implementation study of the Self-Clocked Fair Queuing Credit Aware (SCFQ-CA) and Deficit Round Robin Credit Aware (DRR-CA) scheduling algorithms” proposes specific implementations of the two schedulers taking into account the characteristics of current high-performance networks. A comparison is presented on the complexity of these two algorithms in terms of silicon area and computation delay. Finally we selected one paper for the special paper session: “A Case Study of Communication Optimizations on 3D Mesh Interconnects”. In this paper the authors present topology aware mapping as a technique to optimize communication on 3-dimensional mesh interconnects and hence improve performance. Results are presented for OpenAtom on up to 16,384 processors of Blue Gene/L, 8,192 processors of Blue Gene/P and 2,048 processors of Cray XT3. | ||||
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| C.T.A.M. de Laat, C. Develder, A. Jukan and J. Mambretti, "Introduction", in 15th Int. Euro-Par Conf. Parallel Processing (Euro-Par 2009), Delft, The Netherlands, 25-28 Aug. 2009, pp. 1013-1014. doi:10.1007/978-3-642-03869-3_93 | ||||
| Mertens, L.; Demeester, T.; Deleu, J.; Develder, C. & Demeester, P. |
Context-based person identification for news collections
[Abstract] [BibTeX] [PDF] [plain text citation] |
2012 | Proc. 12th Dutch-Belgian Information Retrieval Workshop (DIR 2012), pp. 26-29 | inproceedings |
| Abstract: In modern automated information extraction systems, Named Entity Disambiguation (NED) techniques are becoming increasingly important. The ambiguity of person names leads to a decrease in the output quality of search engines. This paper presents a two-stage rule-based NED model, based on a local and global context of the mentioned persons. A number of experiments with different scoring functions are reported, as well as a specific evaluation method to estimate the efficiency of the model on a real-life data collection in an unsupervised way. | ||||
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| L. Mertens, T. Demeester, J. Deleu, C. Develder and P. Demeester, "Context-based person identification for news collections", in Proc. 12th Dutch-Belgian Information Retrieval Workshop (DIR 2012), Ghent, Belgium, 23-24 Feb. 2012, pp. 26-29. | ||||
| Mets, K.; Haerick, W. & Develder, C. |
A simulator for the control network of smart grid architectures
[BibTeX] [PDF] [plain text citation] |
2010 |
Vol. 3 Proc. 2nd Int. Conf. on Innovation for Sustainable Production (i-SUP 2010), pp. 50-54 |
inproceedings |
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| K. Mets, W. Haerick and C. Develder, "A simulator for the control network of smart grid architectures", Vol. 3, in Proc. 2nd Int. Conf. on Innovation for Sustainable Production (i-SUP 2010), Bruges, Belgium, 18-21 Apr. 2010, pp. 50-54. | ||||
| Mets, K.; Nelis, J.; Verslype, D.; Leroux, P.; Haerick, W.; De Turck, F. & Develder, C. |
Design of a context aware multimedia management system for home environments
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2009 | Proc. 1st Int. Conf. on Adaptive and Self-adaptive Systems and Applications (Adaptive 2009), part of ComputationWorld 2009, pp. 49-54 | inproceedings |
| Abstract: We present the design, implementation and performanceanalysis of a multimedia management system for homeenvironments. It enables comprehensive access and controlof media that is distributed over multiple devices. Basedon automatic discovery of the media servers and renderers(i.e. audio or display devices) through UPnP, our applicationintegrates all content in a single view (merging contentand/or removing duplicate items). The application is tailoredto a mobile platform and features a context aware platformto automatically select the nearest display device. Adaptivecontent filtering can be applied to restrict the list to content supported by this device. Performance measurements on a proof of concept implementation are presented. | ||||
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| K. Mets, J. Nelis, D. Verslype, P. Leroux, W. Haerick, F. De Turck and C. Develder, "Design of a context aware multimedia management system for home environments", in Proc. 1st Int. Conf. on Adaptive and Self-adaptive Systems and Applications (Adaptive 2009), part of ComputationWorld 2009, Athens, Greece, 15-20 Nov. 2009, pp. 49-54. doi:10.1109/ComputationWorld.2009.111 | ||||
| Mets, K.; Strobbe, M.; Verschueren, T.; Roelens, T.; Develder, C. & De Turck, F. |
Distributed Multi-Agent Algorithm for Residential Energy Management in Smart Grids
[Abstract] [BibTeX] [PDF] [plain text citation] |
2012 | Proc. IEEE/IFIP Netw. Operations and Management Symp. (NOMS 2012) | inproceedings |
| Abstract: Distributed renewable power generators, such as solar cells and wind turbines are difficult to predict, making the demand-supply problem more complex than in the traditional energy production scenario. They also introduce bidirectional energy flows in the low-voltage power grid, possibly causing voltage violations and grid instabilities. In this article we describe a distributed algorithm for residential energy management in smart power grids. This algorithm consists of a market-oriented multi-agent system using virtual energy prices, levels of renewable energy in the real-time production mix, and historical price information, to achieve a shifting of loads to periods with a high production of renewable energy. Evaluations in our smart grid simulator for three scenarios show that the designed algorithm is capable of improving the self consumption of renewable energy in a residential area and reducing the average and peak loads for externally supplied power. | ||||
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| K. Mets, M. Strobbe, T. Verschueren, T. Roelens, C. Develder and F. De Turck, "Distributed Multi-Agent Algorithm for Residential Energy Management in Smart Grids", in Proc. IEEE/IFIP Netw. Operations and Management Symp. (NOMS 2012), Maui, Hawaii, USA, 16-20 Apr. 2012. | ||||
| Mets, K.; Verschueren, T.; De Turck, F. & Develder, C. |
Evaluation of Multiple Design Options for Smart Charging Algorithms
[BibTeX] [DOI] [PDF] [plain text citation] |
2011 | Proc. 2nd IEEE ICC Int. Workshop on Smart Grid Commun. | inproceedings |
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| K. Mets, T. Verschueren, F. De Turck and C. Develder, "Evaluation of Multiple Design Options for Smart Charging Algorithms", in Proc. 2nd IEEE ICC Int. Workshop on Smart Grid Commun., Kyoto, Japan, 5 Jun. 2011. doi:10.1109/iccw.2011.5963579 | ||||
| Mets, K.; Verschueren, T.; De Turck, F. & Develder, C. |
Exploiting V2G to Optimize Residential Energy Consumption with Electrical Vehicle (Dis)Charging
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 | Proc. 1st Int. Workshop Smart Grid Modeling and Simulation (SGMS 2011) at IEEE SmartGridComm 2011, pp. 7-12 | inproceedings |
| Abstract: The potential breakthrough of pluggable (hybrid) electrical vehicles (PHEVs) will impose various challenges to the power grid, and esp. implies a significant increase of its load. Adequately dealing with such PHEVs is one of the challenges and opportunities for smart grids. In particular, intelligent control strategies for the charging process can significantly alleviate peak load increases that are to be expected from e.g. residential vehicle charging at home. In addition, the car batteries connected to the grid can also be exploited to deliver grid services, and in particular give stored energy back to the grid to help coping with peak demands stemming from e.g. household appliances. In this paper, we will address such so-called vehicle-to-grid (V2G) scenarios while considering the optimization of PHEV charging in a residential scenario. In particular, we will assess the optimal car battery (dis)charging scheduling to achieve peak shaving and reduction of the variability (over time) of the load of households connected to a local distribution grid. We compare (i) a business-as-usual (BAU) scenario, without any intelligent charging, (ii) intelligent local charging optimization without V2G, and (iii) charging optimization with V2G. To evaluate these scenarios, we make use of our simulation tool, based on OMNeT++, which combines ICT and power network models and incorporates a Matlab model that allows e.g. assessing voltage violations. In a case study on a three- feeder distribution network spanning 63 households, we observe that non-V2G optimized charging can reduce the peak demand compared to BAU with 64 If we apply V2G to the intelligent charging, we can further cut the non-V2G peak demand with 17% (i.e., achieve a peak load which is only 30% of BAU). | ||||
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| K. Mets, T. Verschueren, F. De Turck and C. Develder, "Exploiting V2G to Optimize Residential Energy Consumption with Electrical Vehicle (Dis)Charging", in Proc. 1st Int. Workshop Smart Grid Modeling and Simulation (SGMS 2011) at IEEE SmartGridComm 2011, Brussels, Belgium, 17 Oct. 2011, pp. 7-12. doi:10.1109/SGMS.2011.6089203 | ||||
| Mets, K.; Verschueren, T.; Develder, C.; Vandoorn, T. & Vandevelde, L. |
Integrated Simulation of Power and Communication Networks for Smart Grid Applications
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 | Proc. 16th IEEE Int. Workshop Computer Aided Modeling, Analysis and Design of Commun. Links and Netw. (CAMAD 2011), pp. 61-65 | inproceedings |
| Abstract: Innovative architectures, control mechanisms and network technologies are being proposed to realize the future smart grid. To assess their impact and effectiveness, simulation is key. Simulation in both areas of communication networks as well as power systems has been widely adopted. However, the coupling of those two worlds calls for tools able to address both. In this paper, we propose an innovative integrated framework that models and simulates both the communication network and power networks. We discuss the design and operation of the simulation environment, and illustrate this by means of a case study that employs it. | ||||
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| K. Mets, T. Verschueren, C. Develder, T. Vandoorn and L. Vandevelde, "Integrated Simulation of Power and Communication Networks for Smart Grid Applications", in Proc. 16th IEEE Int. Workshop Computer Aided Modeling, Analysis and Design of Commun. Links and Netw. (CAMAD 2011), Kyoto, Japan, 10-11 Jun. 2011, pp. 61-65. doi:10.1109/CAMAD.2011.5941119 | ||||
| Mets, K.; Verschueren, T.; Haerick, W.; Develder, C. & De Turck, F. |
Optimizing Smart Energy Control Strategies for Plug-In Hybrid Electric Vehicle Charging
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2010 | Proc. 1st IFIP/IEEE Int. Workshop on Management of Smart Grids, at 2010 IEEE/IFIP Netw. Operations and Management Symp. (NOMS 2010), pp. 293-299 | inproceedings |
| Abstract: The electrification of the vehicle fleet will result in an additional load on the power grid. Adequately dealing with such pluggable (hybrid) electrical vehicles (PHEV) forms part of the challenges and opportunities in the evolution towards Smart Grids. In this paper, we investigate the potential benefits of using control mechanisms, that could be offered by a Home Energy control box, in optimizing energy consumption stemming from PHEV charging in a residential use case. We present smart energy control strategies based on quadratic programming for charging PHEVs, aiming to minimize the peak load and flatten the overall load profile. We compare two strategies, and benchmark them against a business-as-usual scenario assuming full charging starting upon plugging in the PHEV. The first, local strategy only uses information at the home where the PHEV is charged: as a result the charging is optimized for local loads. The local strategy is compared to a global iterative strategy which controls the charging of multiple vehicles based on global load information over a residential area. Both strategies control the duration and rate of charging and result in charging schedules for each vehicle. We present quantitative simulation results over a set of 150 homes, and discuss the strategies in terms of complexity and performance (esp. resulting energy consumption), as well as their requirements concerning infrastructure and communication. | ||||
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| K. Mets, T. Verschueren, W. Haerick, C. Develder and F. De Turck, "Optimizing Smart Energy Control Strategies for Plug-In Hybrid Electric Vehicle Charging", in Proc. 1st IFIP/IEEE Int. Workshop on Management of Smart Grids, at 2010 IEEE/IFIP Netw. Operations and Management Symp. (NOMS 2010), Osaka, Japan, 19-23 Apr. 2010, pp. 293-299. doi:10.1109/NOMSW.2010.5486561 | ||||
| Nelis, J.; Verslype, D.; Develder, C.; Brewka, L.; Wessing, H. & Dittmann, L. |
Bandwidth reservations in home networks: Performance assessment of UPnP-QoS v3
[BibTeX] [PDF] [plain text citation] |
2010 | Proc. 35th IEEE Conf. Local Computer Networks (LCN 2010), pp. 276-279 | inproceedings |
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| J. Nelis, D. Verslype, C. Develder, L. Brewka, H. Wessing and L. Dittmann, "Bandwidth reservations in home networks: Performance assessment of UPnP-QoS v3", in Proc. 35th IEEE Conf. Local Computer Networks (LCN 2010), Denver, CO, USA, 11-14 Oct. 2010, pp. 276-279. | ||||
| Peeters, E.; Develder, C.; Das, J.; Driesen, J. & Belmans, R. |
LINEAR: towards a Breakthrough of Smart Grids in Flanders
[BibTeX] [PDF] [plain text citation] |
2010 |
Vol. 3 Proc. 2nd Int. Conf. on Innovation for Sustainable Production (i-SUP 2010), pp. 3-6 |
inproceedings |
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| E. Peeters, C. Develder, J. Das, J. Driesen and R. Belmans, "LINEAR: towards a Breakthrough of Smart Grids in Flanders", Vol. 3, in Proc. 2nd Int. Conf. on Innovation for Sustainable Production (i-SUP 2010), Bruges, Belgium, 18-21 Apr. 2010, pp. 3-6. | ||||
| Pickavet, M.; Ackaert, A.; Baert, E.; Cheyns, J.; Colle, D.; De Maesschalck, S.; Demeester, P.; Develder, C.; Lievens, I.; Van Breusegem, E.; Verbrugge, S. & Yan, Q. |
Design of communication networks using heuristics (Invited)
[BibTeX] [PDF] [plain text citation] |
2002 | Book of abstracts of "Arbeitskreis Mathematik in Forschung und Praxis", 23rd Symp. on Mathematik in der Telekommunikation | inproceedings |
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| M. Pickavet, A. Ackaert, E. Baert, J. Cheyns, D. Colle, S. De Maesschalck, P. Demeester, C. Develder, I. Lievens, E. Van Breusegem, S. Verbrugge and Q. Yan, "Design of communication networks using heuristics (Invited)", in Book of abstracts of "Arbeitskreis Mathematik in Forschung und Praxis", 23rd Symp. on Mathematik in der Telekommunikation, Duisburg, Germany, 18-19 Mar. 2002. | ||||
| Pickavet, M.; Develder, C.; Baert, E. & Demeester, P. |
AI techniques for planning telecommunication networks
[BibTeX] [PDF] [plain text citation] |
2002 | Proc. Int. Conf. Artificial Intelligence (IC-AI 2002) | inproceedings |
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| M. Pickavet, C. Develder, E. Baert and P. Demeester, "AI techniques for planning telecommunication networks", in Proc. Int. Conf. Artificial Intelligence (IC-AI 2002), Las Vegas, NV, USA, 24-27 Jun. 2002. | ||||
| Pickavet, M.; Vereecken, W.; Demeyer, S.; Audenaert, P.; Colle, D.; Develder, C. & Demeester, P. |
Contribution and role of network architectures in the footprint reduction of ICT
[BibTeX] [PDF] [plain text citation] |
2009 | Proc. Eur. Conf. on Netw. and Optical Commun., in conjunction with 4th Conf. on Optical Cabling and Infrastructure (NOC/OC&I) | inproceedings |
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| M. Pickavet, W. Vereecken, S. Demeyer, P. Audenaert, D. Colle, C. Develder and P. Demeester, "Contribution and role of network architectures in the footprint reduction of ICT", in Proc. Eur. Conf. on Netw. and Optical Commun., in conjunction with 4th Conf. on Optical Cabling and Infrastructure (NOC/OC&I), 2009. | ||||
| Pickavet, M.; Vereecken, W.; Demeyer, S.; Audenaert, P.; Vermeulen, B.; Develder, C.; Dhoedt, B. & Demeester, P. |
Worldwide energy needs for ICT: the rise of power-aware networking
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2008 | Proc. 2nd Int. Symp. on Advanced Networks and Telecommun. Systems (ANTS 2008) | inproceedings |
| Abstract: As Information and Communication Technology (ICT) is becoming more and more wide-spread and pervasive in our daily life, it is important to get a realistic overview of the worldwide impact of ICT on the environment in general and on energy and electricity needs in particular. This paper reports on a detailed study to estimate this impact today and to predict how this will evolve in the future. From this survey, important conclusions for the future of ICT industry and the Internet will be drawn, and challenges and research directives will be deduced. | ||||
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| M. Pickavet, W. Vereecken, S. Demeyer, P. Audenaert, B. Vermeulen, C. Develder, B. Dhoedt and P. Demeester, "Worldwide energy needs for ICT: the rise of power-aware networking", in Proc. 2nd Int. Symp. on Advanced Networks and Telecommun. Systems (ANTS 2008), Mumbai, India, 15-17 Dec. 2008. doi:10.1109/ANTS.2008.4937762 | ||||
| Shaikh, A.; Buysse, J.; Jaumard, B. & Develder, C. |
Anycast routing for survivable optical grids: scalable solution methods and the impact of relocation
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 |
IEEE/OSA J. Opt. Commun. Netw. Vol. 3 (9), pp. 767-779 |
article |
| Abstract: In this paper, we address the issue of resiliency against single link network failures in optical grids and show how the anycast routing principle, which is typical of grids, can be exploited in providing efficient shared path protection. We investigate two different integer linear program models for the full anycast routing problem, deciding on the primary and backup server locations as well as on the lightpaths toward them. The first model is a classical integer linear programming (ILP) model, which lacks scalability. The second model is a large-scale optimization model which can be efficiently solved using column generation techniques. We also design two new heuristics: the first one is an improvement of a previously proposed one which, although providing near optimal solutions, lacks scalability, while the second one is highly scalable, at the expense of reduced accuracy. Numerical results are presented for three mesh networks with varying node degrees. They allow an illustration of the scalability of the newly proposed approaches. Apart from highlighting the difference in performance (i.e., scalability and optimality) among the algorithms, our case studies demonstrate the bandwidth savings that can be achieved by exploiting relocation rather than using a backup path to the original (failure-free) destination site. Numerical results for varying network topologies, as well as different numbers of server sites show that relocation allows bandwidth savings in the range of 7--21 | ||||
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| A. Shaikh, J. Buysse, B. Jaumard and C. Develder, "Anycast routing for survivable optical grids: scalable solution methods and the impact of relocation", IEEE/OSA J. Opt. Commun. Netw., Vol. 3, No. 9, Sep. 2011, pp. 767-779. doi:10.1364/JOCN.3.000767 | ||||
| Stevens, T.; De Leenheer, M.; Develder, C.; De Turck, F.; Dhoedt, B. & Demeester, P. |
ASTAS: Architecture for scalable and transparent anycast services
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2007 |
J. Commun. Netw. Vol. 9 (4), pp. 1229-2370 |
article |
| Abstract: Native information provider (IP) anycast suffers from routing scalability issues and the lack of stateful communication support. For this reason, we propose architecture for scalable and transparent anycast services (ASTAS), a proxy-based architecture that provides support for stateful anycast communications, while retaining the transparency offered by native anycast. Dynamic resource assignment for each initiated session guarantees that a connection is established with the most suitable target server, based on network and server conditions. Traffic engineering in the overlay can be realized in an effective way due to the dissemination of aggregated state information in the anycast overlay. To minimize the total deployment cost for ASTAS architectures, we propose optimized proxy placement and path finding heuristics based on look-ahead information gathered in network nodes. Contrary to a regular integer linear program (ILP) formulation, these heuristics allow to optimize proxy placement in large networks. A use case on a European reference network illustrates that lower proxy costs enable proxy deployment closer to the end-users, resulting in a reduced network load. |
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| T. Stevens, M. De Leenheer, C. Develder, F. De Turck, B. Dhoedt and P. Demeester, "ASTAS: Architecture for scalable and transparent anycast services", J. Commun. Netw., Vol. 9, No. 4, 2007, pp. 1229-2370. doi:1854/9884 | ||||
| Stevens, T.; De Leenheer, M.; Develder, C.; Dhoedt, B.; Christodoulopoulos, K.; Kokkinos, P. & Varvarigos, E. |
Multi-cost job routing and scheduling in Grid networks
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2009 |
Futur. Gener. Comp. Syst. Vol. 25 (8), pp. 912-925 |
article |
| Abstract: A key problem in Grid networks is how to efficiently manage the available infrastructure, in order to satisfy user requirements and maximize resource utilization. This is in large part influenced by the algorithms responsible for the routing of data and the scheduling of tasks. In this paper, we present several multi-cost algorithms for the joint scheduling of the communication and computation resources that will be used by a Grid task. We propose a multi-cost scheme of polynomial complexity that performs immediate reservations and selects the computation resource to execute the task and determines the path to route the input data. Furthermore, we introduce multi-cost algorithms that perform advance reservations and thus also find the starting times for the data transmission and the task execution. We initially present an optimal scheme of non-polynomial complexity and by appropriately pruning the set of candidate paths we also give a heuristic algorithm of polynomial complexity. Our performance results indicate that in a Grid network in which tasks are either CPU- or data-intensive (or both), it is beneficial for the scheduling algorithm to jointly consider the computational and communication problems. A comparison between immediate and advance reservation schemes shows the trade-offs with respect to task blocking probability, end-to-end delay and the complexity of the algorithms. | ||||
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| T. Stevens, M. De Leenheer, C. Develder, B. Dhoedt, K. Christodoulopoulos, P. Kokkinos and E. Varvarigos, "Multi-cost job routing and scheduling in Grid networks", Futur. Gener. Comp. Syst., Vol. 25, No. 8, Sep. 2009, pp. 912-925. doi:10.1016/j.future.2008.08.004 | ||||
| Stevens, T.; de Leenheer, M.; Develder, C.; de Turck, F.; Dhoedt, B. & Demeester, P. |
Anycast Routing Algorithms for Effective Job Scheduling in Optical Grids
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2006 | Proc. European Conf. on Optical Commun. (ECOC 2006), pp. 1-2 | inproceedings |
| Abstract: Effective job scheduling in optical grids requires concurrent optimisation of resource and network path selection. To enable this functionality, practical anycast routing algorithms are proposed, and simulation analysis is used to compare their performance to a pseudo-optimal bound and to several heuristics. | ||||
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| T. Stevens, M. de Leenheer, C. Develder, F. de Turck, B. Dhoedt and P. Demeester, "Anycast Routing Algorithms for Effective Job Scheduling in Optical Grids", in Proc. European Conf. on Optical Commun. (ECOC 2006), Cannes, France, 24-28 Sep. 2006, pp. 1-2. doi:10.1109/ECOC.2006.4801318 | ||||
| Stevens, T.; Vermeir, J.; De Leenheer, M.; Develder, C.; De Turck, F.; Dhoedt, B. & Demeester, P. |
Distributed Service Provisioning Using Stateful Anycast Communications
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2007 | Proc. 32nd IEEE Conf. on Local Computer Networks (LCN 2007), pp. 165-174 | inproceedings |
| Abstract: Notwithstanding IP anycast's introduction in Internet standards dates back to 1993 and its more recent adoption in IPv6 standards, its use in production environments is limited to date. This is mainly because native IP anycast lacks routing scalability and does not support session-based communications, thereby limiting its applicability to single request-response services such as DNS. For this reason, we propose a transparent anycast overlay architecture that retains the strengths of native anycast and neutralizes above-mentioned limitations. The resulting proxy infrastructure unleashes the power of anycast by opening up new opportunities for transparent distributed service provisioning. Taking into account user demands, available resources, network overhead and anycast infrastructure costs, we provide near- optimal heuristics for the placement of proxy nodes and dimensioning the infrastructure in large networks. We show that even modest overlay infrastructures, consisting of a small number of proxy routers, provide an effective stateful anycast solution where the detour via the proxy routers is negligible in terms of extra network load. Furthermore, simulation results illustrate that server state aggregation in the proxy nodes lessens control plane overhead, which contributes significantly to service robustness. | ||||
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| T. Stevens, J. Vermeir, M. De Leenheer, C. Develder, F. De Turck, B. Dhoedt and P. Demeester, "Distributed Service Provisioning Using Stateful Anycast Communications", in Proc. 32nd IEEE Conf. on Local Computer Networks (LCN 2007), Dublin, Ireland, 15-18 Oct. 2007, pp. 165-174. doi:10.1109/LCN.2007.26 | ||||
| Stevens, T.; Wauters, T.; Develder, C.; De Turck, F.; Dhoedt, B. & Demeester, P. |
Analysis of an anycast based overlay system for scalable service discovery and execution
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2010 |
Comput. Netw. Vol. 54 (1), pp. 97-111 |
article |
| Abstract: Support for anycast in the IP network layer allows one source node to contact a single member out of a group of destination nodes configured with the same IP address. Due to the stateless nature of the IP protocol, subsequent packets from the same source node targeted at the same anycast group may arrive at different group members. Consequently, native IP anycast cannot be applied directly to support distributed session-based services. For this reason, an anycast overlay architecture combining the transparency offered by native anycast with support for stateful communications has been proposed. In this paper, we investigate the operational impact of deploying this overlay architecture. Performance evaluation of a data plane prototype implementation for an anycast overlay node shows that high throughput and small latency can be achieved. Additionally, we show how threshold-based update triggering, in combination with an appropriate inter-proxy update strategy, delivers control plane accuracy with minimal network overhead. | ||||
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| T. Stevens, T. Wauters, C. Develder, F. De Turck, B. Dhoedt and P. Demeester, "Analysis of an anycast based overlay system for scalable service discovery and execution", Comput. Netw., Vol. 54, No. 1, Jan. 2010, pp. 97-111. doi:10.1016/j.comnet.2009.08.008 | ||||
| Tzanakaki, A.; Anastasopoulos, M.; Georgakilas, K.; Buysse, J.; De Leenheer, M.; Develder, C.; Peng, S.; Nejabati, R.; Escalona, E.; Simeonidou, D.; Ciulli, N.; Landi, G.; Brogle, M.; Manfredi, A.; López, E.; Ferrer Riera, J.; Garcia-Espin, J.A.; Figuerola, S.; Donadio, P.; Parladori, G. & Jiménez, J. |
Energy Efficiency Considerations in Integrated IT and Optical Network Resilient Infrastructures (Invited)
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2011 | Proc. 13th Int. Conf. Transparent Optical Netw. (ICTON 2011), pp. 1-4 | inproceedings |
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| A. Tzanakaki, M. Anastasopoulos, K. Georgakilas, J. Buysse, M. De Leenheer, C. Develder, S. Peng, R. Nejabati, E. Escalona, D. Simeonidou, N. Ciulli, G. Landi, M. Brogle, A. Manfredi, E. López, J. Ferrer Riera, J.A. Garcia-Espin, S. Figuerola, P. Donadio, G. Parladori and J. Jiménez, "Energy Efficiency Considerations in Integrated IT and Optical Network Resilient Infrastructures (Invited)", in Proc. 13th Int. Conf. Transparent Optical Netw. (ICTON 2011), Stockholm, Sweden, 26-30 Jun. 2011, pp. 1-4. doi:10.1109/ICTON.2011.5971045 | ||||
| Tzanakaki, A.; Anastasopoulos, M.; Georgakilas, K.; Buysse, J.; De Leenheer, M.; Develder, C.; Peng, S.; Nejabati, R.; Escalona, E.; Simeonidou, D.; Ciulli, N.; Landi, G.; Brogle, M.; Manfredi, A.; Lopez, E.; Ferrer Riera, J.; García-Espín, J.; Donaldio, P.; Parladori, G. & Jimenez, J. |
Energy Efficiency in integrated IT and Optical Network Infrastructures: The GEYSERS approach
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2011 | Proc. IEEE Infocom Workshop on Green Commun. Netw., pp. 343-348 | inproceedings |
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| A. Tzanakaki, M. Anastasopoulos, K. Georgakilas, J. Buysse, M. De Leenheer, C. Develder, S. Peng, R. Nejabati, E. Escalona, D. Simeonidou, N. Ciulli, G. Landi, M. Brogle, A. Manfredi, E. Lopez, J. Ferrer Riera, J. García-Espín, P. Donaldio, G. Parladori and J. Jimenez, "Energy Efficiency in integrated IT and Optical Network Infrastructures: The GEYSERS approach", in Proc. IEEE Infocom Workshop on Green Commun. Netw., Shanghai, China, 15 Apr. 2011, pp. 343-348. doi:10.1109/INFCOMW.2011.5928835 | ||||
| Van Caenegem, R.; Develder, C.; Baert, E.; Colle, D.; Pickavet, M. & Demeester, P. |
Architectures for OPS metro rings: comparing active versus passive nodes / A dimensioning point of view
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2004 | Proc. 8th IFIP Working Conf. on Optical Network Design and Modelling (ONDM 2004), pp. 101-120 | inproceedings |
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| R. Van Caenegem, C. Develder, E. Baert, D. Colle, M. Pickavet and P. Demeester, "Architectures for OPS metro rings: comparing active versus passive nodes / A dimensioning point of view", in Proc. 8th IFIP Working Conf. on Optical Network Design and Modelling (ONDM 2004), Ghent, Belgium, 2-4 Feb. 2004, pp. 101-120. | ||||
| Van Houdt, B.; Develder, C.; Pérez, J.F.; Pickavet, M. & Dhoedt, B. |
Mean Field Calculation for Optical Grid Dimensioning
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2010 |
IEEE/OSA J. Opt. Commun. Netw. Vol. 2 (6), pp. 355-367 |
article |
| Abstract: For traditional optical network dimensioning, a plethora of algorithms exists to design the amount of network resources required to accommodate a given amount of traffic, expressed as a (source, destination)-based traffic matrix. In optical Grid dimensioning, however, the anycast principle applies: Grid users do not really care where exactly their tasks (Grid jobs) end up being executed. Thus, the destination of traffic is not known beforehand and traditional dimensioning algorithms are not applicable. In this paper we propose a mean field calculation method to analytically derive the traffic matrix for given job arrival intensities at the originating Grid sites (the sources). We also indicate how it can be integrated in a stepwise dimensioning approach to compute not only the amount of network resources, but also Grid resources (computational and/or storage). Hence it forms part of a solution for Grid dimensioning: determining how many servers to provide, where to place them, and which network to install for interconnecting server sites and users generating Grid jobs. | ||||
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| B. Van Houdt, C. Develder, J.F. Pérez, M. Pickavet and B. Dhoedt, "Mean Field Calculation for Optical Grid Dimensioning", IEEE/OSA J. Opt. Commun. Netw., Vol. 2, No. 6, Jun. 2010, pp. 355-367. doi:10.1364/JOCN.2.000355 | ||||
| Vankeirsbilck, Bertand Develder, C.; Van Leeuwen, T.; Verslype, D. & Dhoedt, B. |
DLNA Interworking for Virtualized Set-top-boxes
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2010 | Proc. 8th Eur. Conf. Interactive TV and Video (EuroITV 2010) | inproceedings |
| Abstract: This paper proposes and evaluates a server centered approach to integrating personal content, residing in the user’s home network, in the Electronic Program Guide (EPG) of digital broadcast television. With this approach, a server located outside the home of the user takes the integration work for its account, leaving the set-top-box to only handle the interaction with the user. We compare this approach to the situation in which the set-top-box executes the EPG. The benefits of the server centered approach are mainly simplification of the settop- box leading to less maintenance, reduced energy consumption and lower cost while the functionality is boosted as it could connect in the same way to other services in-home and on the Internet. Another key benefit is that the central service can be easily upgraded without changing anything to the STB itself. We show that the overhead of sending the descriptions of the in-home content to the server is limited. The delay perceived by the user is limited to a typical value of 100 ms. The upstream bandwidth used for sending descriptions of in-home content to the integration server takes on average 100 Bytes per item, thanks to fairly simple compression techniques. |
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| C. Vankeirsbilck, Bertand Develder, T. Van Leeuwen, D. Verslype and B. Dhoedt, "DLNA Interworking for Virtualized Set-top-boxes", in Proc. 8th Eur. Conf. Interactive TV and Video (EuroITV 2010), 2010. | ||||
| Vankeirsbilck, Bertand Nelis, J.; Verlsype, D.; Develder, C.; Van Leeuwen, T. & Dhoedt, B. |
Integrating Personal Media and Digital TV with QoS Guarantees using Virtualized Set-Top Boxes: Architecture and Performance Measurements
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2010 | Proc. 35th IEEE Conf. Local Computer Networks (LCN 2010), pp. 504-511 | inproceedings |
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| J. Vankeirsbilck, Bertand Nelis, D. Verlsype, C. Develder, T. Van Leeuwen and B. Dhoedt, "Integrating Personal Media and Digital TV with QoS Guarantees using Virtualized Set-Top Boxes: Architecture and Performance Measurements", in Proc. 35th IEEE Conf. Local Computer Networks (LCN 2010), Denver, CO, USA, 11-14 Oct. 2010, pp. 504-511. | ||||
| Vereecken, W.; Deboosere, L.; Simoens, P.; Vermeulen, B.; Colle, D.; Develder, C.; Pickavet, M.; Dhoedt, B. & Demeester, P. |
Power efficiency of thin clients
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2010 |
Eur. Trans. Telecomm. Vol. 21 (6), pp. 479-490 |
article |
| Abstract: Worldwide, awareness for energy consumption is rising because of global energy production limits as well as because of environmental concerns. As the energy fraction currently consumed by ICT-related equipment is substantial (about 8 per cent of electricity consumption worldwide in the use phase) and the growth rate in this particular sector is spectacular, in the ICT sector, adequate solutions are needed to allow sustainable growth. In this paper we aim at reducing power consumption of desktop applications by applying a thin client approach and we analyse the conditions necessary. To this end, estimates on power consumptions in typical desktop scenarios and analogous thin client settings are made and analysed. The paper concludes with an experimental study on currently available equipment, to translate the generic conclusions into their current implications and trade-offs. | ||||
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| W. Vereecken, L. Deboosere, P. Simoens, B. Vermeulen, D. Colle, C. Develder, M. Pickavet, B. Dhoedt and P. Demeester, "Power efficiency of thin clients", Eur. Trans. Telecomm., Vol. 21, No. 6, Oct. 2010, pp. 479-490. doi:10.1002/ett.1431 | ||||
| Vereecken, W.; Deboosere, L.; Simoens, P.; Vermeulen, B.; Colle, D.; Develder, C.; Pickavet, M.; Dhoedt, B. & Demeester, P. |
Energy efficiency in thin client solutions
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2009 | Proc. 1st Int. ICST Workshop on Green Grids, co-located with GridNets 2009 | inproceedings |
| Abstract: In current society it is becoming more and more important to take energy efficiency considerations into account when designing solutions. In ICT, virtualisation is being regarded as a way to increase energy efficiency. This paper analyses the energy saving opportunities of the thin client paradigm. | ||||
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| W. Vereecken, L. Deboosere, P. Simoens, B. Vermeulen, D. Colle, C. Develder, M. Pickavet, B. Dhoedt and P. Demeester, "Energy efficiency in thin client solutions", in Proc. 1st Int. ICST Workshop on Green Grids, co-located with GridNets 2009, Athens, Greece, 8 Sep. 2009. doi:10.1007/978-3-642-11733-6_12 | ||||
| Verschueren, T.; Mets, K.; Haerick, W.; Develder, C.; De Turck, F. & Pollet, T. |
Architectures for smart end-user services in the power grid
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2010 | Proc. 1st IFIP/IEEE Int. Workshop on Management of Smart Grids, at 2010 IEEE/IFIP Netw. Operations and Management Symp. (NOMS 2010), pp. 316-322 | inproceedings |
| Abstract: The increase of distributed renewable electricity generators, such as solar cells and wind turbines, requires a new energy management system. These distributed generators introduce bidirectional energy flows in the low-voltage power grid, requiring novel coordination mechanisms to balance local supply and demand. Closed solutions exist for energy management on the level of individual homes. However, no service architectures have been defined that allow the growing number of end-users to interact with the other power consumers and generators and to get involved in more rational energy consumption patterns using intuitive applications. We therefore present a common service architecture that allows houses with renewable energy generation and smart energy devices to plug into a distributed energy management system, integrated with the public power grid. Next to the technical details, we focus on the usability aspects of the end-user applications in order to contribute to high service adoption and optimal user involvement. The presented architecture facilitates end-users to reduce net energy consumption, enables power grid providers to better balance supply and demand, and allows new actors to join with new services. We present a novel simulator that allows to evaluate both the power grid and data communication aspects, and illustrate a 22% reduction of the peak load by deploying a central coordinator inside the home gateway of an end-user. | ||||
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| T. Verschueren, K. Mets, W. Haerick, C. Develder, F. De Turck and T. Pollet, "Architectures for smart end-user services in the power grid", in Proc. 1st IFIP/IEEE Int. Workshop on Management of Smart Grids, at 2010 IEEE/IFIP Netw. Operations and Management Symp. (NOMS 2010), Osaka, Japan, 19-23 Apr. 2010, pp. 316-322. doi:10.1109/NOMSW.2010.5486557 | ||||
| Verschueren, T.; Mets, K.; Meersman, B.; Strobbe, M.; Develder, C. & Vandevelde, L. |
Assessment and mitigation of voltage violations by solar panels in a residential distribution grid
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2011 | Proc. 2nd IEEE Int. Conf. Smart Grid Communications (SmartGridComm 2011), pp. 540-545 | inproceedings |
| Abstract: Distributed renewable electricity generators, such as solar cells and wind turbines introduce bidirectional energy flows in the low-voltage power grid, possibly causing voltage violations and grid instabilities. The current solution to this problem comprises automatically switching off some of the local generators resulting in a loss of green energy. In this paper we study the impact of different solar panel penetration levels in an residential area and the corresponding effects on the distribution feeder line. To mitigate these problems, we assess how effective it is to locally store excess energy in batteries. A case study on a residential feeder serving 63 houses shows that if 80% of them have photo-voltaic (PV) panels, 45% of them will be switched off, resulting in 482 kWh of PV-generated energy being lost. We show that providing a 9 kWh battery at each house can mitigate some voltage violations, and therefor allowing for more renewable energy to be used. | ||||
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| T. Verschueren, K. Mets, B. Meersman, M. Strobbe, C. Develder and L. Vandevelde, "Assessment and mitigation of voltage violations by solar panels in a residential distribution grid", in Proc. 2nd IEEE Int. Conf. Smart Grid Communications (SmartGridComm 2011), Brussels, Belgium, 17-20 Oct. 2011, pp. 540-545. doi:10.1109/SmartGridComm.2011.6102381 | ||||
| Verslype, D.; Nelis, J.; Verschueren, T.; Haerick, W.; De Turck, F. & Develder, C. |
Framework for Ubiquitous Discovery and Access to Home Services
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2009 | Proc. 1st Int. Conf. on Advanced Service Computing (Service Computation 2009), part of ComputationWorld 2009, pp. 398-403 | inproceedings |
| Abstract: To relieve the end user of the configuration burdenthat arises when new devices are installed in the (home)network, service discovery protocols (SDP) have been devised. These enable automatic discovery of the services these devices offer. Yet, the existing SDPs are not compatible or interoperable. In this paper, we propose a framework that automatically translates between the various SDPs. We also solve the problem of current SDPs that only enable discovery within a single local (sub)network. Through a remote access component, we enable sharing of the services between multiple home networks. Hence we realize sharing of services over the boundaries of SDPs and home networks. Results of performance measurements on a proof-of-concept implementation illustrate that the frameworkoperates transparently to the various SDPs: translation has no significant impact on response times compared to native SDP services. | ||||
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| D. Verslype, J. Nelis, T. Verschueren, W. Haerick, F. De Turck and C. Develder, "Framework for Ubiquitous Discovery and Access to Home Services", in Proc. 1st Int. Conf. on Advanced Service Computing (Service Computation 2009), part of ComputationWorld 2009, Athens, Greece, 15-20 Nov. 2009, pp. 398-403. doi:10.1109/ComputationWorld.2009.109 | ||||
| Vicat-Blanc, P.; Figuerola, S.; Chen, X.; Landi, G.; Escalona, E.; Develder, C.; Tzanakaki, A.; Demchenko, Y.; García-Espín, J.A.; Ferrer, J.; López, E.; Soudan, S.; Buysse, J.; Jukan, A.; Ciulli, N.; Brogle, M.; van Laarhoven, L.; Belter, B.; Anhalt, F.; Nejabati, R.; Simeonidou, D.; Ngo, C.; de Laat, C.; Biancani, M.; Roth, M.; Donadio, P.; Jiménez, J.; Antoniak-Lewandowska, M. & Gumaste, A. Domingue, J. & others (Ed.) |
Bringing Optical Networks to the Cloud: an Architecture for a Sustainable future Internet (
The Future Internet
)
[Abstract] [BibTeX] [DOI] [PDF] [plain text citation] |
2011 |
The Future Internet Vol. 6656/2011 , pp. 307-320 |
inbook |
| Abstract: Over the years, the Internet has become a central tool for society. The extent of its growth and usage raises critical issues associated with its design principles that need to be addressed before it reaches its limits. Many emerging applications have increasing requirements in terms of bandwidth, QoS and manageability. Moreover, applications such as Cloud computing and 3D-video streaming require optimization and combined provisioning of di erent infrastructure resources and services that include both network and IT resources. Demands become more and more sporadic and variable, making dynamic provisioning highly needed. As a huge energy consumer, the Internet also needs to be energyconscious. Applications critical for society and business (e.g., health, finance) or for real-time communication demand a highly reliable, robust and secure Internet. Finally, the future Internet needs to support sustainable business models, in order to drive innovation, competition, and research. Combining optical network technology with Cloud technology is key to addressing the future Internet/Cloud challenges. In this context, we propose an integrated approach: realizing the convergence of the IT- and optical-network-provisioning models will help bring revenues to all the actors involved in the value chain. Premium advanced network and IT managed services integrated with the vanilla Internet will ensure a sustainable future Internet/Cloud enabling demanding and ubiquitous applications to coexist. | ||||
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| P. Vicat-Blanc, S. Figuerola, X. Chen, G. Landi, E. Escalona, C. Develder, A. Tzanakaki, Y. Demchenko, J.A. García-Espín, J. Ferrer, E. López, S. Soudan, J. Buysse, A. Jukan, N. Ciulli, M. Brogle, L. van Laarhoven, B. Belter, F. Anhalt, R. Nejabati, D. Simeonidou, C. Ngo, C. de Laat, M. Biancani, M. Roth, P. Donadio, J. Jiménez, M. Antoniak-Lewandowska and A. Gumaste, "Bringing Optical Networks to the Cloud: an Architecture for a Sustainable future Internet", in: "The Future Internet", Springer, LCNS, Vol. 6656/2011, 2011, pp. 307-320. doi:10.1007/978-3-642-20898-0_22 | ||||
| Willner, A.; Ferrer Riera, J.; Garcia-Espin, J.A.; Figuerola, S.; De Leenheer, M. & Develder, C. |
An analytical model of the service provisioning time within the Harmony network service plane
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2010 | Proc. 2nd IEEE Int. Workshop on Management of Emerging Networks and Services (IEEE MENS 2010), pp. 514-518 | inproceedings |
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| A. Willner, J. Ferrer Riera, J.A. Garcia-Espin, S. Figuerola, M. De Leenheer and C. Develder, "An analytical model of the service provisioning time within the Harmony network service plane", in Proc. 2nd IEEE Int. Workshop on Management of Emerging Networks and Services (IEEE MENS 2010), Miami, FL, USA, 10 Dec. 2010, pp. 514-518. doi:10.1109/GLOCOMW.2010.5700373 | ||||
| Zervas, G.; Nejabati, R.; Simeonidou, D.; Rafaelli, C.; Savi, M.; Develder, C.; De Leenheer, M.; Colle, D.; Ciulli, N.; Carrozzo, G. & Schiano, M. |
Programmable multi-granular optical networks: requirements and architecture
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2009 | Proc. 6th Int. Conf. on Broadband Commun., Netw. and Systems (Broadnets 2009) | inproceedings |
| Abstract: This paper presents a programmable multi-granular optical cross connect (MG-OXC) and network architecture deployable in multi-service and multi-provider networks. The concept of programmable MG-OXC is introduced to provide a way of utilizing multiple switching/transport granularities to efficiently support the emerging traffic demands in both core and metro networks. For this reason, the supported bandwidth granularities include full lambdas, sub- and super-lambdas and multiple transport formats such as bursts, flows and packets. The programmability is envisaged by a software/hardware platform that simplifies network control, re-planning at the logical level and end-to-end service transparency, by translating the technology-specific information to technology independent services in an abstracted and logical manner. | ||||
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| G. Zervas, R. Nejabati, D. Simeonidou, C. Rafaelli, M. Savi, C. Develder, M. De Leenheer, D. Colle, N. Ciulli, G. Carrozzo and M. Schiano, "Programmable multi-granular optical networks: requirements and architecture", in Proc. 6th Int. Conf. on Broadband Commun., Netw. and Systems (Broadnets 2009), 14-17 Sep. 2009. | ||||
| Zervas, G.S.; De Leenheer, M.; Sadeghioon, L.; Klonidis, D.; Qin, Y.; Nejabati, R.; Simeonidou, D.; Develder, C.; Dhoedt, B. & Demeester, P. | Multi-Granular Optical Cross-Connect: Design, Analysis, and Demonstration | 2009 |
IEEE/OSA J. Opt. Commun. Netw. Vol. 1 (1), pp. 69-84 |
article |
| Abstract: A fundamental issue in all-optical switching is to offer efficient and cost-effective transport services for a wide range of bandwidth granularities. This paper presents multi-granular optical cross-connect (MG-OXC) architectures that combine slow (ms regime) and fast (ns regime) switch elements, in order to support optical circuit switching (OCS), optical burst switching (OBS), and even optical packet switching (OPS). The MG-OXC architectures are designed to provide a cost-effective approach, while offering the flexibility and reconfigurability to deal with dynamic requirements of different applications. All proposed MG-OXC designs are analyzed and compared in terms of dimensionality, flexibility/reconfigurability, and scalability. Furthermore, node level simulations are conducted to evaluate the performance of MG-OXCs under different traffic regimes. Finally, the feasibility of the proposed architectures is demonstrated on an application-aware, multi-bit-rate (10 and 40 Gbps), end-to-end OBS testbed. | ||||
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| G.S. Zervas, M. De Leenheer, L. Sadeghioon, D. Klonidis, Y. Qin, R. Nejabati, D. Simeonidou, C. Develder, B. Dhoedt and P. Demeester, "Multi-Granular Optical Cross-Connect: Design, Analysis, and Demonstration", IEEE/OSA J. Opt. Commun. Netw., Vol. 1, No. 1, Jun. 2009, pp. 69-84. doi:10.1364/JOCN.1.000069 | ||||
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