Mina Riahee; Mostafa Zandieh
Abstract
Recovering, recycling, and remanufacturing end-of-life products (disassembly line) are appropriate methods of reducing the environmental impact associated with wastes. A disassembly line is a viable option for doing so. The objective of the disassembly line balancing problem (DLBP) is to coordinate disassembly ...
Read More
Recovering, recycling, and remanufacturing end-of-life products (disassembly line) are appropriate methods of reducing the environmental impact associated with wastes. A disassembly line is a viable option for doing so. The objective of the disassembly line balancing problem (DLBP) is to coordinate disassembly line activities so that total operating times of workstations are nearly equal. The disassembly process mainly aims to reuse components in end-of-life products and thus reduce adverse environmental effects. This paper employs an approach based on the Kano model, Fuzzy AHP, M-TOPSIS, and PROMETHEE. Furthermore, using AND/OR precedence relationships, the optimal sequence of disassembly is obtained. Tasks are assigned to workstations according to priority and precedence relationships. An illustrative example of the proposed method is solved using both M-TOPSIS and PROMETHEE. Both methods lead to a decrease of two seconds in total cycle time. Despite yielding equal results, PROMETHEE is superior to M-TOPSIS in terms of complexity and ease of use. However, it takes longer to complete.
seddigheh khorshid; samad nojavan
Volume 11, Issue 28 , April 2013, , Pages 61-97
Abstract
Competitiveness is core of businesses in market economics. It means the ability and performance of a firm, sub-sector or a country to sell and supply goods and/or service in a given market. Porter's competitiveness forces model is one of the most well-known framework for analyzing the competitiveness ...
Read More
Competitiveness is core of businesses in market economics. It means the ability and performance of a firm, sub-sector or a country to sell and supply goods and/or service in a given market. Porter's competitiveness forces model is one of the most well-known framework for analyzing the competitiveness of firms, that has been extensively used to develop and formulate the competitive strategies of firms in order to increase their competitive edge. The aim of this article is to be measure and analyze Irankhodro firm's competitiveness with using Porter's competitiveness forces model to select a competitive strategy. A questionnaire survey is conducted for collecting research data from Irankhodro firm's managers and expert employees. Then research data is analyzed by fuzzy model based on integrating fuzzy AHP and DEA.The findings of research show: a. the most important of competitive forces with which Irankhodro firm faces, are rival firms competitive intensity and the threat of entry of new competitors. B. Irandkhodro firm was fierce with high fix cost, perceived level differentiation, exist barriers allocation per value added, degree of differentiation of inputs, supplier concentration to firm concentration ratio, buyer propensity to substitutes, switching costs of suppliers relative to firms switching cost. These sub-factors can decrease Irankhodro firm's competitiveness level. C. Irankhodro firm's competitiveness level is moderate, and focus strategy based on cost leadership is the most proper of competitive strategy in order to sustain and enhance competitive power
