this paper addresses a reliable facility location problem with considering facility capacity constraints. in reliable facility location problem some facilities may become unavailable from time to time. if a facility fails, its clients should refer to other facilities by paying the cost of retransfer to these facilities. hence, the fail of facilities leads to disruptions in facility location dec...

A significant and growing volume of global trade travels on container ships, and each year larger ships are introduced. For this reason, the Container Stowage Problem, a fundamental problem in marine cargo transportation involving the optimal assignment of shipping containers of various types to specific storage locations in container ship at each port in order to maximize loading and unloading...

This paper starts with the rapidity of new energy vehicles and hazards power battery disposal, puts forward importance construction a reverse logistics network for used batteries, then analyzes characteristics operating modes network. Based on results analysis, heuristic is proposed. The algorithm uses two-stage to solve problem waste location-transportation, proposes design so that recycling b...

In this article, equipment overhaul is considered in a multi-stage flow shop scheduling problem. problem, the equipments are disassembled first stage, and repairs done on parallel workshops second assembly operation third stage. Considering three-stage with machines stages new industry. The sequence of processing determined as well allocation should be such way that total completion time jobs m...

Institutional investors usually employ mean-variance analysis to determine optimal portfolio weights. Almost immediately upon implementation, however, the portfolio’s weights become sub-optimal as changes in asset prices cause the portfolio to drift away from the optimal targets. We apply a quadratic heuristic to address the optimal rebalancing problem, and we compare it to a dynamic programmin...

Available online 18 August 2009

Nowadays, a variety of information related to the distance between two wireless devices can be easily obtained. This paper presents a hybrid localization scheme that combines received signal strength (RSS) and round-trip time (RTT) information with the aim of improving the previous localization schemes. The hybrid localization scheme is based on an RSS ranging technique that uses RTT ranging es...

This paper presents, as a case study, the application of a two-phase heuristic evolutionary algorithm to obtain personalized timetables in a Spanish university. The algorithm consists of a two-phase heuristic, which, starting from an initial ordering of the students, allocates students into groups, taking into account the student’s preferences as a primal factor for the assignment. An evolution...