Efficient distribution of items resulting from supply contracts and public contributions in crisis

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Efficient distribution of items resulting from supply contracts and public contributions in crisis

ارائه دهنده: Provider: atiye naeeni

اساتید راهنما: Supervisors: parvaneh samouei

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Javad Behnamian_Nafiseh Soleimani

زمان و تاریخ ارائه: Time and date of presentation: 2026

مکان ارائه: Place of presentation: اتاق سمینار گروه صنایع

چکیده: Abstract: Efficient procurement and distribution of relief items in crisis situations is one of the fundamental issues in humanitarian supply chain management, which is of great importance and sensitivity due to demand uncertainty, resource limitations, time pressure, and the complexity of coordination among responsible organizations. Under such conditions, improving the efficiency of relief systems requires approaches capable of supporting the integrated coordination of strategic decisions made before a crisis and operational decisions made after its occurrence. Accordingly, the present study aims to provide a quantitative and integrated framework for improving the procurement and distribution process of relief items by developing a mathematical model in the field of humanitarian logistics, in which supply contracts, pre-positioned inventory, and public participation are simultaneously taken into consideration. In the proposed model, in addition to economic and operational considerations, the social dimensions of the problem are also incorporated through quantitative modeling, such that public trust and the capacity resulting from public donations are included in the model structure as two influential components affecting the performance of the relief system. To address uncertainty conditions, a robust fuzzy approach is employed. The augmented epsilon-constraint method in the GAMS environment is used to solve the model in small-scale instances. Furthermore, for large-scale problems, the metaheuristic algorithms NSGA-II and NRGA are applied, and their performance in obtaining efficient solutions is evaluated. The findings of the study indicate that integrating supply contracts with pre-positioned inventory and public participation can reduce dependence on costly emergency procurement while improving the level of preparedness and the speed of response in crisis situations. The results also show that simultaneously considering economic, operational, and social factors provides a more realistic and effective basis for decision-making in crisis management and leads to enhanced flexibility, resilience, and efficiency of relief systems.