Browsing by Subject "Multiple criteria analysis"
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Item Open Access Capturing preferences for inequality aversion in decision support(Elsevier, 2018-01-16) Karsu, Özlem; Morton, A.; Argyris, N.We investigate the situation where there is interest in ranking distributions (of income, of wealth, of health, of service levels) across a population, in which individuals are considered preferentially indistinguishable and where there is some limited information about social preferences. We use a natural dominance relation, generalised Lorenz dominance, used in welfare comparisons in economic theory. In some settings there may be additional information about preferences (for example, if there is policy statement that one distribution is preferred to another) and any dominance relation should respect such preferences. However, characterising this sort of conditional dominance relation (specifically, dominance with respect to the set of all symmetric increasing quasiconcave functions in line with given preference information) turns out to be computationally challenging. This challenge comes about because, through the assumption of symmetry, any one preference statement (“I prefer giving $100 to Jane and $110 to John over giving $150 to Jane and $90 to John”) implies a large number of other preference statements (“I prefer giving $110 to Jane and $100 to John over giving $150 to Jane and $90 to John”; “I prefer giving $100 to Jane and $110 to John over giving $90 to Jane and $150 to John”). We present theoretical results that help deal with these challenges and present tractable linear programming formulations for testing whether dominance holds between any given pair of distributions. We also propose an interactive decision support procedure for ranking a given set of distributions and demonstrate its performance through computational testing.Item Open Access A multicriteria facility location model for municipal solid waste management in North Greece(Elsevier, 2008) Erkut, E.; Karagiannidis, A.; Perkoulidis, G.; Tjandra, S. A.Up to 2002, Hellenic Solid Waste Management (SWM) policy specified that each of the country's 54 prefectural governments plan its own SWM system. After 2002, this authority was shifted to the country's 13 regions entirely. In this paper, we compare and contrast regional and prefectural SWM planning in Central Macedonia. To design the prefectural plan, we assume that each prefecture must be self-sufficient, and we locate waste facilities in each prefecture. In contrast, in the regional plan, we assume cooperation between prefectures and locate waste facilities to serve the entire region. We present a new multicriteria mixed-integer linear programming model to solve the location-allocation problem for municipal SWM at the regional level. We apply the lexicographic minimax approach to obtain a "fair" nondominated solution, a solution with all normalized objectives as equal to one another as possible. A solution to the model consists of locations and technologies for transfer stations, material recovery facilities, incinerators and sanitary landfills, as well as the waste flow between these locations.Item Open Access A supplier evaluation and selection system in Turk Tractor Factory(Bilkent University, 1995) Aktaş, PınarThe world is changing toward globalization. Therefore, the markets are becoming more and more competitive each day. It is harder for companies to be good performers. Realizing this fact, they are trying to have the highest contribution from different sources they have. This includes the financial sources as well as people. However, there is an important success key that should not be disregarded. These are the suppliers where 40- 60% of the total sales of manufacturing companies are spent. Knowing this, the companies should choose and use their suppliers at the highest maximum performance. This study establishes a system for the evaluation and selection of suppliers where an application will be carried out in a company in the automotive sector, Turk Tractor Factory.