Identification and evaluation of congestion in two-stage network data envelopment analysis
- سال انتشار: 1402
- محل انتشار: فصلنامه بین المللی تحقیقات در مهندسی صنایع، دوره: 12، شماره: 1
- کد COI اختصاصی: JR_RIEJ-12-1_005
- زبان مقاله: انگلیسی
- تعداد مشاهده: 307
نویسندگان
Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of Applied Mathematics, Islamic Azad University, Rasht, Iran
Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Department of Mathematics, Central Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده
Congestion is one of the important concepts in data envelopment analysis that occurs when excessive inputs reduce the maximally possible outputs. Identification and elimination of congestion have a significant impact on reducing inputs along with increasing outputs. Hence, various studies have been conducted to detect and evaluate congestion. However, in today's world, no organization can achieve its final output with just one process of input. In other words, today's organizations have a network structure that consists of several subsections. Ignoring the existing influences among the subsections processes may lead to inadequate or even incorrect results for evaluating the congestion. While all of the existing methods only evaluate the congestion of each subsection or the whole system independently. Therefore, in this paper, the concept of congestion is developed for a specific and so practical case of network structure called “two-stage network structure”. This case of network structure consists of two series stage such that stage ۱ consume some primary inputs to produce some intermediate outputs. In the following, the intermediate outputs are used as the inputs of stage ۲ to produce the final output. Here, the concept of congestion is defined for systems with a two-stage structure. Then, to examine the congestion of each stage as well as the congestion of the whole system, a single linear programming model is proposed. The validity of the proposed model is investigated using several theorems and it is shown that the new definition is a generalization of the previous definitions of the congestion for the black-box systems. Finally, the proposed model is applied to a case study including ۲۴ non-life insurance companies in Taiwan.کلیدواژه ها
Network Data Envelopment Analysis, Two-stage network structure, Intermediate output, Congestionاطلاعات بیشتر در مورد COI
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