In the recent decade, special attention is paid to reverse logistic due to economic benefits of recovery and recycling of used products as well as environmental legislation and social concerns. On the other hand، many researches claim that separately and sequential planning of forward and reverse logistic causes sub-optimality. Effective transport activities are also one of the most important c...

Logistics Network Design includes network configuration decisions having long-standing influences on other tactical and operational decisions. Recently, regarding environmental issues and customer awareness and global warming closed-loop supply chain network design is taken into consideration. The proposed network for the integrated forward and reverse logistics is developed by formulating a cy...

Development of every society is incumbent upon energy sector’s technological and economic effectiveness. The electricity industry is a growing and needs to have a better performance to effectively cover the demand. The industry requires a balance between cost and efficiency through careful design and planning. In this paper, a two-stage stochastic programming model is presented for the design o...

This paper investigates the network location problem for single-server facilities that are subject to congestion. In each network edge, customers are uniformly distributed along the edge and their requests for service are assumed to be generated according to a Poisson process. A number of facilities are to be selected from a number of candidate sites and a single server is located at each facil...

As recognized by several authors, the design of a reverse logistics network is a complex problem and still relatively unexplored and underdeveloped. We propose a binary particle swarm optimization (BPSO)-based scheme for solving a NP-hard remanufacturing network design problem. The algorithm combines a traditional stochastic search with an optimal solution method for solving to optimality a rel...

this study investigated utilization of electronic learning facilities among agricultural students in michael okpara university of agriculture, umudike. one hundred and twenty (120) students undergoing training in different agricultural courses in the university were randomly selected. data were collected with a structured questionnaire and analyzed with descriptive statistics such as frequency ...

A p-facility location problems on a network N consist of locating p new facilities on N such that some function of distances among them and vertices of N is minimum. We consider a class of such problems where objective function is nondecreasing in distance. The median, the center and the centdian problems belong to this class. We prove that the optimal solution on the network and on the corresp...