Autor: Climaco, J. N. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Implementation and performance of a new multiple objective dynamic routing method for multiexchange networks
Autorzy:: Martins, L.
Craveirinha, J.
Climaco, J.N.
Gomez, T.
Powiązania:: https://bibliotekanauki.pl/articles/307696.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: dynamic routing
multiple objective routing
multiexchange telecommunication network performance
Opis:: The paper describes new developments of a multiple objective dynamic routing method (MODR) for circuit-switched networks previously presented, based on the periodic calculation of alternative paths for every node pair by a specialised bi-objective shortest path algorithm (MMRA). A model is presented that enables the numerical calculation of two global network performance parameters, when using MMRA. This model puts in evidence an instability problem in the synchronous path computation model which may lead to solutions with poor global network performance, measured in terms of network mean blocking probability and maximum node-to-node blocking probability. The essential requirements of a heuristic procedure enabling to overcome this problem and select "good" routing solutions in every path updating period, are also discussed.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 3; 60-66
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: On the performance analysis of a heuristic approach dedicated to a multiobjective dynamic routing model
Autorzy:: Craveirinha, J.
Martins, L.
Climaco, J. N.
Jorge, L.
Powiązania:: https://bibliotekanauki.pl/articles/309018.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: multiple criteria analysis
routing
heuristics
telecommunications
Opis:: In previous works the features and a complete formulation for circuit-switched networks of a multiple objective dynamic routing method (MODR) of periodic state dependent routing type were presented. The aim of the model is to resolve a very complex network bi-objective dynamic routing problem, by recurring to a heuristic for synchronous path selection enabling to obtain a good compromise solution in terms of two network performance measures. In this paper we present a study on the performance of variants of the MODR heuristic of synchronous path selection by using relaxations of the values previously calculated for the two network objective functions. This study permitted the development of an improved version of the initial heuristic. Also a comparison of the analytical values of the network objective functions obtained with selected variants of the initial heuristic with the corresponding results from a known reference method, the real time network routing (RTNR) method, given by a discrete-event simulator for single-service networks, is presented.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 3; 14-23
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A new multiple objective dynamic routing method using implied costs
Autorzy:: Craveirinha, J.
Martins, L.
Antunes, C.H.
Climaco, J.N.
Powiązania:: https://bibliotekanauki.pl/articles/307698.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: dynamic routing
multicriteria decision support systems
traffic management
Opis:: There are advantages in considering the routing problem in integrated communication networks as a multiobjective shortest path problem, having in mind to grasp eventual conflicts and trade-offs among distinct objectives and quality of services (QoS) constraints. On the other hand the utilisation of dynamic routing methods in various types of networks is well known to have significant impact on network performance and cost, namely in overload and failure conditions. This paper presents the detailed formulation of a proposal of a multiple objective dynamic routing method (MODR) of periodic state dependent routing type, enabling to represent distinct QoS related metrics and requirements in a consistent manner. The MODR method present formulation is based on a multiple objective shortest path model with constraints and is prepared to use implied costs as one of the metrics. Alternative paths tor each traffic flow are changed as a function of periodic updates of certain QoS related parameters estimated from real time measurements on the routes and trunks of the network. Such paths are computed by a specialised and efficient variant of a bi-objective shortest path constrained algorithm, developed for the MODR, enabling to incorporate flexible requirements on the QoS metrics. The architecture of the routing system is discussed together with the features of its main modules. An illustrative example of application of the MODR path calculation module to a circuit-switched type network using blocking probability and implied cost as metrics, is also presented, considering different overload conditions.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 3; 50-59
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A note on the computation of ordered supported non-dominated solutions in the bi-criteria minimum spanning tree problems
Autorzy:: Silva, C. G.
Cli'maco, J. C. N.
Powiązania:: https://bibliotekanauki.pl/articles/308580.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: minimum spanning tree
supported non-dominated solutions
combinatorial problems
Opis:: This paper presents a new procedure for computing the set of supported non dominated solutions of bi-criteria minimum spanning tree problems in ordered manner. The procedure is based on the systematic detection of edges which must be replaced in one efficient solution to obtain the adjacent one, in the criteria space. This new approach avoids solving unnecessary problems and makes use of previous computations.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 4; 11-15
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Traffic splitting in MPLS networks - a hierarchical multicriteria approach
Autorzy:: Craveirinha, J. M. F.
Cli'maco, J. C. N.
Pascoal, M. M. B.
Martins, L. M. R. A.
Powiązania:: https://bibliotekanauki.pl/articles/308582.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: multicriterial optimization
multicriteria shortest paths
routing telecommunication networks
Internet/MPLS
Opis:: In this paper we address a new hierarchical multicriteria routing model associated with a two-path traffic splitting routing method in MPLS networks whereby the bandwidth required by a given node-to-node traffic flow is divided by two disjoint paths. The model has two levels of objective functions and several constraints. An algorithmic approach is presented for calculating non-dominated solutions and selecting good compromise solutions to this problem. Also a number of computational experiments are presented.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 4; 3-10
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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