| Name | Co-authors | Talk | Session |
Guillaume Amand
Université de Liège | | Stackleberg game in transportation | Friday 09:25:00 | |
Francis Bach
INRIA - Ecole Normale Superieure
France | | Discriminative Clustering for Image Co-segmentation | Thursday 14:00:00 | |
Justyna Bakowska
Hasselt University
| An Caris, Katrien Ramaekers,Gerrit Janssens, Tom Bellemans | Developments in Freight Modeling | Thursday 16:10:00 | |
Jeroen Beliën
hogeschool universiteit brussel | Dries Goossens, Daam Van Reeth, Liesje De Boeck | Using mixed integer programming to win a cycling game | Thursday 14:00:00 | |
Lotte Berghman
Katholieke Universiteit Leuven | Roel Leus | Using Lagrangian relaxation to solve a dock assignment problem | Thursday 16:10:00 | |
Burak Bilgin
Kaho Sint-Lieven | Patrick De Causmaecker, Greet Vanden Berghe | Modelling questions in nurse rostering | Friday 11:00:00 | |
Raymond Bisdorff
University of Luxembourg
Luxembourg | | On detecting and enumerating chordless circuits in a digraph | Friday 15:10:00 | |
Pierre Borckmans
UCL (INMA) | Pierre-Antoine Absil | Fast Oriented Bounding Box Computation Using Particle Swarm Optimization | Thursday 14:00:00 | |
Kris Braekers
Universiteit Hasselt | Gerrit K. Janssens and An Caris | Integrating empty container allocation with vehicle routing decisions | Thursday 14:00:00 | |
Willem K. Brauers
University of Antwerp | R. Ginevicius, R. Bisdorff | Regional Development in a Well-Being Economy: The Case of Lithuania | Friday 09:00:00 | |
Jasmine Buré
KULeuven | Pieter Vansteenwegen, Dirk Cattrysse | The mobile repairman problem: classification of existing models | Friday 15:10:00 | |
Sylvie Busschaert
University of Antwerp | | Evaluation of multi-criteria techniques for project portfolio management | Friday 09:00:00 | |
Dario Campagna
University of Perugia
Italy | | A CLP engine for product configuration | Friday 11:00:00 | |
Wouter Charle
K.U.Leuven
| Francesco Viti, Chris M.J. Tampère | A clustering approach to estimate route travel time distributions | Friday 09:25:00 | |
Herman Crauwels
campus De Nayer, Hogeschool voor Wetenschap & Kunst | | Educational course timetabling: a case study | Thursday 11:00:00 | |
Stefan Creemers
K.U.Leuven
| Roel Leus | R&D project planning with multiple trials in uncertain environments | Thursday 16:10:00 | |
Frans De Rooij
AIMMS
The Netherlands | | Fast optimization modeling with AIMMS | Friday 15:10:00 | |
Stijn De Vuyst
Ghent University | Dieter Fiems (first author), Stijn De Vuyst, Herwig Bruneel. | Queueing analysis of outpatient scheduling in health care | Friday 11:00:00 | |
Boris Defourny
University of Liege | Damien Ernst and Louis Wehenkel | Extra-Small Scenario Trees for Multistage Stochastic Programming | Friday 09:25:00 | |
Peter Demeester
KaHo Sint-Lieven | | A hyper-heuristics approach to solve a real-world and a benchmark examination timetabling problem | Thursday 11:00:00 | |
Peter Demeester
KaHo Sint-Lieven | G. Vanden Berghe, P. De Causmaecker | Educational timetabling, an overview of a mature research domain | Thursday 11:00:00 | |
Thomas Demoor
Ghent University | Dieter Fiems and Herwig Bruneel | Simulation study of outpatient scheduling with unpunctual patients | Friday 11:00:00 | |
Reginald Dewil
Katholieke Universiteit Leuven | Pieter Vansteenwegen, Dirk Cattrysse | The generalized sequential ordering problem for laser cutting toolpath generation | Thursday 14:00:00 | |
Jérémie Dubois-lacoste
IRIDIA, CoDE, Université Libre de Bruxelles | Manuel López-Ibáñez and Thomas Stützle | A Hybrid Algorithm for Bi-objective Flowshop Scheduling | Thursday 16:10:00 | |
Wout Dullaert
University of Antwerp | B. Raa | Aggregate production-distribution planning with shared production resources | Friday 09:25:00 | |
Julien Dupuis
UCLouvain | Pierre Schaus, Yves Deville | Failure Detection for the Bin-Packing Constraint | Thursday 16:10:00 | |
Céline Engelbeen
Université Libre de Bruxelles | Antje Kiesel | Binary matrix decompositions without tongue-and-groove underdosage for radiation therapy planning | Friday 11:00:00 | |
Mahsa Faizrahnemoon
Islamic Azad University, Tehran Science and Research Branch
| A. Davoodi | Sensitivity analysis of the additive model in data envelopment analysis while inputs and outputs are fuzzy data | Friday 09:00:00 | |
Bart Feyaerts
Ghent University
| Stijn De Vuyst, Sabine Wittevrongel, Herwig Bruneel | Modelling data traffic performance in file servers: session-based arrivals | Friday 11:00:00 | |
| | Abstract:
Abstract
Contemporary communication networks are faced with increasingly heterogeneous traffic characteristics. In order to get reliable predictions about the network performance, adequate models for both data traffic and network components are indispensable. In this paper we focus on the session-based arrival process, a novel model for data traffic. This model considers users that can start and end sessions, during which data are transported over the network. We then use the model to obtain analytical and numerical results for the mean delay of a session in a network buffer.
1 Introduction
Packet buffers are crucial components in many communication networks, where they provide for temporary storage of data packets. A sound understanding of these buffers and how they behave, is therefore crucial to study the network performance as a whole. An essential factor of the performance measures of a packet buffer, is the nature of the arrival process that generates the data packets. Session-based arrival streams form a new approach for modelling data traffic in modern communication networks. Users from an infinite population can start and end sessions, during which data are sent over the network.
In this paper, we focus on a packet buffer, modelled as a discrete-time, single-server queueing system with infinite buffer capacity, geometric service times and session-based arrivals. Per time slot, each of the sessions generates a random but strictly positive number of information packets. The sessions all last for a random, but yet again, strictly positive number of time slots. This session-based packet generation scheme counts as a generalization of the train arrival process, where sessions (in this context referred to as messages) have a fixed bandwidth of 1 packet per slot.
All data traffic arriving to the buffer can be divided into an arbitrary number T of session types. Each of these session types is characterized by three stochastic components. The session generation process of a particular type describes the number of new sessions of that type during a random slot. The session bandwidth denotes the number of packets generated by a session during a random slot. Finally, the session length corresponds to the number of slots a session lasts.
2 Description of the analysis
In previous work [1], a Markovian system state description with an infinite-length system state vector was constructed. This vector contains the buffer content at the end of a certain slot and for each session type, the number of active sessions during that slot, grouped by the amount of slots the sessions are already active. Also the steady-state probability generating function of this system state vector has been obtained, as well as analytical expressions for the mean buffer content and the mean packet delay.
Based on these preliminary results, we now investigate the mean value of the session delay. The delay of a session is defined as the integer number of slots, starting at the end of the slot in which the session's first packet arrives to the buffer, until the end of the slot in which the session's final packet leaves the system. The first step is then to obtain the mean session delay of sessions of a given type and length. This derivation is very different for single-slot and multiple-slot sessions. In the next step we produce the mean session delay of sessions of a given type by taking the sum of the conditional means obtained in the former step, weighted over the corresponding session length probability. In the final step, an analogous weighted sum yields the overall mean session delay.
Numerical examples show both some intuitive and some more intriguing results. As expected, an increasing system load leads to an increasing mean session delay; this result is also obtained for an increasing variance in the arrival process. A more counterintuitive result is that the mean session delay can be smaller than the mean packet delay for some configurations. This can occur when there is unbalanced traffic: frequent few-packet sessions in combination with unfrequent many-packet sessions where the major part of the packets arrive during the unfrequent sessions. Although these unfrequent sessions have little effect on the mean session delay, they have a crucial effect on the mean packet delay.
3 Application
A possible application of our model is to study the behaviour of the output buffer of a file server. Considering each file transfer as a single session, the traffic to such an output buffer can be well described by our session-based model. Since the model allows for general distributions of both the session lengths and the session bandwidths, it enables us to take into account actual traffic characteristics, as observed from a real traffic trace.
References
[1] S. Wittevrongel, S. De Vuyst and H. Bruneel, Analysis of discrete-time buffers with general session-based arrivals, Proceedings of ASMTA 2009 (Madrid, June 2009), Lecture Notes in Computer Science, 2009, vol. 5513, pp. 189-203.
|
Kevin Ghislain
ULB
Limal | B. Fortz, S. Zampelli, P. Schaus, A. Zanarini | DynaUniversity2009 | Thursday 14:00:00 | |
Dries Goossens
Katholieke Universiteit Leuven | F.C.R. Spieksma | The carry-over effect does not exist in football | Thursday 11:00:00 | |
Maria Govorun
ULB, Belgium | | Financial flow modeling for non-state pension funds | Thursday 16:10:00 | |
Marie-anne Guerry
Vrije Universiteit Brussel
Brussel | | Multicriteria decision making in a multi-level manpower system | Friday 09:00:00 | |
Sophie Hautphenne
Université Libre de Bruxelles | Guy Latouche | Extinction Probability of a Branching Process in a Markovian Random Environment | Friday 09:25:00 | |
Trong Viet Ho
UCL, Belgium | Yves Deville, Olivier Bonaventure | Implementation in COMET of a Traffic Engineering technique that Preserves IP Fast Reroute | Thursday 14:00:00 | |
Olivier Hudry
Ecole nationale supérieure des télécommunications
France | Lucile Belgacem, Irène Charon | Independent sets and the routing and wavelength assignment problem | Thursday 11:00:00 | |
Mariya Ishteva
Université catholique de Louvain, Department of Mathematical Engineering | PA. Absil, S. Van Huffel, L. De Lathauwer | On the best low multilinear rank approximation of higher-order tensors | Thursday 11:00:00 | |
Imed Kacem
UNIVERSITY PAUL VERLAINE METZ
France | Hans Kellerer | No-Wait Scheduling of a Single-Machine to Minimize the Maximum Lateness | Friday 09:00:00 | |
Sandeep Karmarkar
India Institute of Management, Ahmedabad
India | G. Dutta, T. Bandyopadhyay | Impact of Demand Unconstraining and Dependency on Airlines Revenue Performance | Thursday 16:10:00 | |
Ben Lauwens
Royal Military Academy
| | Stochastic Hybrid Simulation | Friday 11:00:00 | |
Vianney Le Clément
UCLouvain | Yves Deville, Christine Solnon | Constraint-Based Graph Matching | Thursday 14:00:00 | |
Sabine Limbourg
HEC-ULg
Liège | B. Jourquin | Location and market area of rail-road terminals | Thursday 11:00:00 | |
Thibaut Lust
Faculté Polytechnique de Mons | Jacques Teghem | Combining metaheuristics and exact methods to solve the multiobjective multidimensional knapsack problem | Friday 09:00:00 | |
Guoxuan Ma
K.U. Leuven | Erik Demeulemeester | Evaluating the impact of case mix decisions on capacity utilizations through discrete-event simulation | Friday 11:00:00 | |
Tabitha Maes
Hasselt University
Beligië | Katrien Ramaekers, An Caris, Tom Bellemans, Gerrit Janssens | Incorporating logistics decisions in activity-based freight modeling | Thursday 11:00:00 | |
Thierry Marchant
Ghent University | | Score-based bibliometric rankings of authors | Friday 11:00:00 | |
Jean-luc Marichal
University of Luxembourg
Luxembourg | P. Mathonet | Measuring the interactions among variables of functions over the unit hypercube | Friday 11:00:00 | |
Pierre Mathonet
University of Luxemboug,
Luxembourg | JL. Marichal | Weighted Banzhaf interaction indexes and weighted least squares | Friday 11:00:00 | |
Pablo Andres Maya Duque
University of Antwerp | K. Sorensen, P. Goos | A GRASP metaheuristic for allocating resources to improve the accessibility in a road network after a natural disaster | Thursday 11:00:00 | |
Tommy Messelis
KULeuven Campus Kortrijk | Stefaan Haspeslagh, Patrick De Causmaecker | On expressing nurse rostering constraints as propositional satisfiability problems | Thursday 16:10:00 | |
Stephane Aimé Metchebon Takougang
UMONS, Faculté Polytechnique de Mons | M. Pirlot | Assessing the evolution of a situation based on GIS | Friday 11:00:00 | |
Gilles Meyer
University of Liège | Gilles Meyer, Silvère Bonnabel and Rodolphe Sepulchre | Regression on fixed-rank positive semidefinite matrices: a geometric approach | Thursday 11:00:00 | |
Mustafa Misir
KaHo Sint-Lieven - Katholieke Universiteit Leuven | Katja Verbeeck, Greet Vanden Berghe, Patrick De Causmaecker | Hyper-heuristics learning a varying set of low-level heuristics | Friday 09:00:00 | |
Jean-noël Monette
Université catholique de Louvain | Yves Deville, Pascal Van Hentenryck | Just-In-Time Scheduling with Constraint Programming | Friday 11:00:00 | |
Sébastien Mouthuy
Université Catholique de Louvain | Y.Deville and P.Van Hentenryck | Constraint-based Very Large-Scale Neighborhoods | Thursday 14:00:00 | |
Giang Nguyen
Universite Libre de Bruxelles
| | Markov Chains to solve the Hamiltonian Cycle Problem | Thursday 11:00:00 | |
Sergio Perelman
Université de Liège | Tomas Serebrisky | Measuring the Technical Efficiency of Airports in Latin America and the Caribbean | Thursday 16:10:00 | |
Quang Dung Pham
UCLouvain | Yves DEVILLE, Pascal van HENTENRYCK | Constrained Optimum Paths Problems with LS(Graph) | Thursday 16:10:00 | |
Thierry Pironet
Université de Liège | Amand, Arda, Crama, Kronus, Pironet | Vehicle loading optimization with stochastic supply | Thursday 11:00:00 | |
Michael Poss
Université Libre de Bruxelles | L.S. Moulin, C. Sagastizabal | Transmission Expansion Planning with Re-design | Thursday 11:00:00 | |
Birger Raa
Ghent University | W. Dullaert | An integrated solution method for order batching and picking | Friday 15:10:00 | |
Patrick Schittekat
University of Antwerp
| Frederik Michieks | Searching for reliable routes in case of customer demand dependence | Thursday 14:00:00 | |
Frederic Semet
Ecole Centrale de Lille
France | B. Gendron, P.-V. Khuong | Variable Neighborhood Approaches For a Multi-Echelon Capacitated Location-Distribution Problem | Friday 09:25:00 | |
Rodolphe Sepulchre
Université de Liège
| Michel Journée, Peter Richtarik, Yurii Nesterov | Generalized Power Method for Sparse Principal Component Analysis | Thursday 11:00:00 | |
Megha Sharma
Indian Institute of Management Ahmedabad
India | D. Gosh | Design of Reliable Networks | Thursday 11:00:00 | |
Thomas Stützle
Université Libre de Bruxelles (ULB)
Brussels | Prasanna Balaprakash, Mauro Birattari, Marco Dorigo | Effective Estimation-based Stochastic Local Search Algorithms for Stochastic Routing Problems | Friday 11:00:00 | |
Kenneth SÖrensen
Universiteit Antwerpen | Dirk Cattrysse | A Variable Neighbourhood Search metaheuristic for scheduling the hot rolling operations at a steel mill | Thursday 16:10:00 | |
Fabrice Talla Nobibon
Katholieke Universiteit Leuven | C. Hurkens, R. Leus, FCR. Spieksma | Coloring Graphs to Avoid Monochromatic Cycles | Friday 15:10:00 | |
Philippe Toint
Fac. Universitaires Notre-Dame de la Paix | | BFO: a simple "brute-force" optimizer | Thursday 14:00:00 | |
Konstantinos Triantis
Virginia Tech/Northern Virginia Center
Usa | Warren Vaneman, Kalyan Pasupathy | Dynamic Performance Measurement and Evaluation: Will Bridging Paradigms Lead to Improved System Design? | Thursday 16:10:00 | |
Natalya Usotskaya
Maastricht University
Netherlands | A.Berger, A.Grigoriev | The time-optimal helicopter trajectory is a circle segment | Thursday 14:00:00 | |
Joos Van Den Bergh
University of Antwerp | Kenneth Sorensen | Effective routing for couriers: a divide and conquer strategy | Thursday 14:00:00 | |
Rowan Van Schaeren
Antwerp Maritime Academy | | Tank allocation for liquid bulk vessels using a hybrid constraint programming approach | Friday 11:00:00 | |
Sofie Van Volsem
Ghent University
Zwijnaarde | S. Neirynck | Using the PlayStation3 for speeding up metaheuristic optimization | Friday 09:00:00 | |
Wim Vancroonenburg
KaHo Sint-Lieven | T. Wauters, G. Vanden Berghe | A real world 1D stock cutting problem: exact and heuristic algorithms | Thursday 14:00:00 | |
Pablo Vanegas
Katholieke Universiteit Leuven | Dirk Cattrysse, Jos Van Orshoven | Budget Constraint in Reforestation for Sediment Flow Minimization | Thursday 14:00:00 | |
Jannes Verstichel
KaHo Sint-Lieven | G. Vanden Berghe, H. Callens | A pooling approach for the feed mixing problem | Thursday 11:00:00 | |
Joris Walraevens
Ghent University - UGent
| Tom Maertens. Herwig Bruneel | Generalization of preemptive and non-preemptive priority queues | Friday 11:00:00 | |
Tony Wauters
KaHo Sint-Lieven | Jannes Verstichel, Katja Verbeeck, Greet Vanden Berghe | A hybrid learning and combinatorial optimization approach for automotive maintenance scheduling | Thursday 16:10:00 | |
Pieter Wuille
KULeuven | Tom Schrijvers | Finite Domain Modeling and Solving in the Monadic Constraint Programming Framework | Thursday 16:10:00 | |
80 talks
