Performance Evaluation and Planning Methods for the Next by Andre Girard, Brunilde Sansò, Felida Vazquez-Abad

By Andre Girard, Brunilde Sansò, Felida Vazquez-Abad

GERAD celebrates this yr its twenty fifth anniversary. the heart was once created in 1980 via a small staff of professors and researchers of HEC Montreal, McGill collage and of the Ecole Polytechnique de Montreal. GERAD's actions completed adequate scope to justify its conversion in June 1988 right into a Joint study Centre of HEC Montreal, the Ecole Polytechnique de Montreal and McGill collage. In 1996, the U- versite du Quebec a Montreal joined those 3 associations. GERAD has fifty individuals (professors), greater than twenty examine affiliates and publish doctoral scholars and greater than 1000s grasp and Ph.D. scholars. GERAD is a multi-university middle and a necessary discussion board for the devel- ment of operations learn. Its undertaking is outlined round the following 4 complementarily ambitions: • the unique and professional contribution to all learn fields in GERAD's uniqueness; • The dissemination of study leads to the simplest medical retailers in addition to within the society often; • the learning of graduate scholars and submit doctoral researchers; • The contribution to the industrial neighborhood via fixing very important difficulties and offering transferable instruments.

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However, it is very important that the chosen traffic descriptor is able to capture burstiness of the packet arrivals, 1 Design of IP Networks with End-to-End Performance Guarantees 21 as real IP traffic exhibits such characteristic. The dimensioning model applied for the solution of the CA problem in the proposed framework, incorporates procedures that allow burstiness of multi-class IP traffic to be effectively modelled. , GI arrival process, for this purpose, represents a reasonable balance between the accuracy and the efficiency required by a network design tool, especially when large networks, as well as large aggregates of individual flows into service classes are considered.

Algorithm LP2 and/or the cost function of some common links is steeply decreasing then keeping the routes fixed may not be a good idea. The LP2 heuristic manages to solve the overall OPQR-G problem with standard LP techniques. 2), both x^v and di are unknowns, therefore, this formulation is not linear, and cannot be solved by LP solvers. 3. We have reformulated the OPQR-G problem as an LP problem (problem OPQR-G-LP2), defined below, which the algorithm LP2 must solve at each iteration step. 4) leE Subject to: J2 dl - X7DUV + i1 ~ x f ) M V G RUV «?

It will become clear when we present algorithm LP2 that without any knowledge of the routes, it is impossible to describe the problem OPQR-G as an LP problem2. 3b) The algorithm LP1 and the heuristic OPQR-G are conceptually the same. Both LP1 and the heuristic use INITIALISATION to compute the routes for all OD pairs and then re-adjust the delay partition such that the new partition does not violate end-to-end delay constraints. The only thing that differentiates between the two algorithms is how re-adjustment of the delay partition is achieved.

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