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    Wyświetlanie 1-4 z 4
    Tytuł:
    Decision Support under Risk by Optimization of Scenario Importance Weighted OWA Aggregations
    Autorzy:
    Ogryczak, W.
    Śliwiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/308912.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    aggregation methods
    decisions under risk
    OWA
    scenarios
    WOWA
    Opis:
    The problem of evaluation outcomes under several scenarios to form overall objective functions is of considerable importance in decision support under uncertainty. The fuzzy operator defined as the so-called weighted OWA (WOWA) aggregation offers a well-suited approach to this problem. The WOWA aggregation, similar to the classical ordered weighted averaging (OWA), uses the preferential weights assigned to the ordered values (i.e., to the worst value, the second worst and so on) rather than to the specific criteria. This allows one to model various preferences with respect to the risk. Simultaneously, importance weighting of scenarios can be introduced. In this paper we analyze solution procedures for optimization problems with the WOWA objective functions related to decisions under risk. Linear programming formulations are introduced for optimization of theWOWA objective representing risk averse preferences. Their computational efficiency is demonstrated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 3; 5-13
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On equitable approaches to resource allocation problems: the conditional minimax solutions
    Autorzy:
    Ogryczak, W.
    Śliwiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/309239.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    sieci telekomunikacyjne
    telecommunication networks
    resource allocation
    equity
    minmax solution
    Opis:
    In this paper we introduce and analyze a solution concept of the conditional minimax as a generalization of the minimax solution concept extended to take into account the number of services (the portion of demand) related to the worst performances. Namely, for a specified portion of demand we take into account the corresponding portion of the maximum results and we consider their average as the worst conditional mean to be minimized. We show that, similar to the standard minimax approach, the minimization of the worst conditional mean can be defined by a linear objective and a number of auxiliary linear inequalities. We report some results of initial computational experience with the new solution concept.
    Źródło:
    Journal of Telecommunications and Information Technology; 2002, 3; 40-48
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fair resource allocation schemes and network dimensioning problems
    Autorzy:
    Ogryczak, W.
    Śliwiński, T.
    Wierzbicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307704.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    sieci telekomunikacyjne
    telecommunication networks
    network dimensioning
    resource allocation
    fairness
    Opis:
    Resource allocation problems are concerned with the allocation of limited resources among competing activities so as to achieve the best overall performances of the system but providing fair treatment of all the competitors. Telecommunication networks are facing the increasing demand for Internet services. Therefore, a problem of network dimensioning with elastic traffic arises which requires to allocate bandwidth to maximize service flows with fair treatment of all the services. In such applications, the so-called max-min fairness (MMF) solution concept is widely used to formulate the resource allocation scheme. This guarantees the fairness but may lead to significant losses in the overall throughput of the network. In this paper we show how multiple criteria optimization concepts can be used to generate various fair resource allocation schemes. The solution concepts are tested on the network dimensioning problem and their abilities to model various preferences are demonstrated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 3; 34-42
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Path Diversity Protection in Two-Layer Networks
    Autorzy:
    Dzida, M.
    Śliwiński, T.
    Zagożdżon, M.
    Ogryczak, W.
    Pióro, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308914.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    link dimensioning
    path diversity
    resilient routing
    two-layer network optimization
    Opis:
    The paper addresses an optimization problem related to dimensioning links in a resilient two-layer network. A particular version of the problem which assumes that links of the upper layer are supported by unique paths in the lower layer is considered. Two mixed-integer programming formulations of this problem are presented and discussed. Direct resolving of these formulations requirespre-selection of "good" candidate paths in the upper layer of the network. Thus, the paper presents an alternative approach which is based on decomposing the resolution process into two phases, resolved iteratively. The first phase subproblem is related to designing lower layer path flows that provide the capacities for the logical links of the upper layer. The second phase is related to designing the flow patterns in the upper layer with protection assured through diversity of paths. In this phase we take into account the failures of the logical links that result from the failures of the lower layer links (so called shared risk link groups).
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 3; 14-19
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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