The single vehicle routing problem with multiple routes is a variant of the vehicle routing problem where the vehicle can be dispatched to several routes during its workday to serve a number of customers. In this paper we propose a goal programming model for multi-objective single vehicle routing problem with time windows and multiple routes. To solve the model, we present a heuristic method wh...

This research presents a fuzzy multi-objective model for a machine selection problem in a flexible manufacturing system of a tire company. Two main objectives are minimization of an average machine error and minimization of the total setup time. Conventionally, the working team uses trial and error in selecting a pressing machine for each task due to the complexity and constraints of the proble...

Natural gas is a main source of energy in Iran, and optimal allocation to different sectors crucial, based on realities, geopolitical considerations, national security concerns. In this paper, multi-objective goal programming model developed study the resource various consumption sectors, including household business, industry, petrochemical power plants, injection oil fields, export from Iran ...