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    Wyświetlanie 1-6 z 6
    Tytuł:
    Hyper-heuristics for power-aware routing protocols
    Autorzy:
    Pilski, M.
    Seredynski, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/92944.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
    Tematy:
    protocols
    ad hoc networks
    genetic algorithm
    hyper-heuristics
    Opis:
    The idea underlying hyper-heuristics is to discover some combination of straightforward heuristics that performs very well across a whole range of problems. In this paper we describe genetic algorithm-based (GA) approach that learns such a heuristic combination for solving energy-efficient routing problem in mobile ad hoc networks (MANETs).
    Źródło:
    Studia Informatica : systems and information technology; 2008, 2(11); 37-47
    1731-2264
    Pojawia się w:
    Studia Informatica : systems and information technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fairness considerations with algorithms for elastic traffic routing
    Autorzy:
    Cinkler, T.
    Laborczi, P.
    Pióro, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308189.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    elastic traffic
    routing
    fairness
    maximum throughput
    algorithms
    ILP
    heuristics
    Opis:
    The bit rate of modern applications typically varies in time. We consider the traffic elastic if the rate of the sources can be controlled as a function of free resources along the route of that traffic. The objective is to route the demands optimally in sense of increasing the total network throughput while setting the rates of sources in a fair way. We propose a new fairness definition the relative fairness that handles lower and upper bounds on the traffic rate of each source and we compare it with two other known fairness definitions, namely, the max-min and the proportional rate fairness. We propose and compare different routing algorithms, all with three types of fairness definitions. The algorithms are all a tradeoff between network throughput, fairness and computational time.
    Źródło:
    Journal of Telecommunications and Information Technology; 2004, 2; 3-12
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solving IRP using location based heuristics
    Autorzy:
    Hanczar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/406343.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    inventory routing problem
    optimization
    vendor managed inventory
    Opis:
    Inventory routing problems (IRPs) occur where vendor managed inventory replenishment strategies are implemented in supply chains. These problems are characterized by the presence of both transportation and inventory considerations, either as parameters or constraints. The research presented in this paper aims at extending IRP formulation developed on the basis of location based heuristics proposed by Bramel and Simchi-Levi and continued by Hanczar. In the first phase of proposed algorithms, mixed integer programming is used to determine the partitioning of customers as well as dates and quantities of deliveries. Then, using 2-opt algorithm for solving the traveling sales-person problem the optimal routes for each partition are determined. In the main part of research the classical formulation is extended by additional constraints (visit spacing, vehicle filling rate, driver (vehicle) consistency, and heterogeneous fleet of vehicles) as well as the additional criteria are discussed. Then the impact of using each of proposed extensions for solution possibilities is evaluated. The results of computational tests are presented and discussed. Obtained results allow to conclude that the location based heuristics should be considered when solving real life instances of IRP.
    Źródło:
    Operations Research and Decisions; 2014, 24, 2; 81-96
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Routing flow-shop with buffers and ready times - comparison of selected solution algorithms
    Autorzy:
    Józefczyk, J.
    Markowski, M.
    Balgabaeva, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/406986.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    manufacturing systems
    operations research
    complex systems
    optimization problems
    scheduling algorithms
    routing algorithms
    heuristics
    computer simulation
    Opis:
    This article extends the former results concerning the routing flow-shop problem to minimize the makespan on the case with buffers, non-zero ready times and different speeds of machines. The corresponding combinatorial optimization problem is formulated. The exact as well as four heuristic solution algorithms are presented. The branch and bound approach is applied for the former one. The heuristic algorithms employ known constructive idea proposed for the former version of the problem as well as the Tabu Search metaheuristics. Moreover, the improvement procedure is proposed to enhance the quality of both heuristic algorithms. The conducted simulation experiments allow evaluating all algorithms. Firstly, the heuristic algorithms are compared with the exact one for small instances of the problem in terms of the criterion and execution times. Then, for larger instances, the heuristic algorithms are mutually compared. The case study regarding the maintenance of software products, given in the final part of the paper, illustrates the possibility to apply the results for real-world manufacturing systems.
    Źródło:
    Management and Production Engineering Review; 2014, 5, 4; 26-35
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-saving Algorithms for the Control of Backbone Networks: A Survey
    Autorzy:
    Kamola, M.
    Niewiadomska-Szynkiewicz, E.
    Arabas, P.
    Sikora, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307968.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    green routing
    mixed-integer programming
    OSPF heuristics
    power-save networks
    Opis:
    The rapid growth of energy demand by wired IP networks can be mitigated on hardware and software levels. While upgrading to more efficient transmission media still brings biggest savings, we take a look here at power-saving algorithms that combine the capability of setting networking equipment in arbitrary energy states which, combined with profound knowledge of the network traffic matrix, leads to considerable complex optimization problem formulations. Alternatively, lightweighted heuristic approaches are presented, built on much simpler network model but still capable to perform energy-efficient traffic engineering.
    Źródło:
    Journal of Telecommunications and Information Technology; 2016, 2; 13-20
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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