this paper considers the problem of scheduling hybrid flowshops with machine availability constraints (mac) to minimize makespan. the paper deals with a specific case of mac caused by preventive maintenance (pm) operations. contrary to previous papers considering fixed or/and conservative policies, we explore a case in which pm activities might be postponed or expedited while necessary. regardi...

This paper presents two metaheuristic algorithms, namely taboo search and simulated annealing, applied to the control of a flow rack automated storage retrieval system (AS/RS). These metaheuristic algorithms are developed to control the retrieval machine of the AS/RS in order to minimize the retrieval cycle time. Results of these metaheuristic algorithms are compared to classical heuristics and...

In this study, optimal operation of a reservoir by incorporation the hedging policy and Bat Algorithm (BA) is investigated. The deficit in water supply dam minimized as objective function monthly releases from are determined compared three hedging-based rules. first rule, which has single decision variable, constant release considered for all 240 months period. second scenario, one fixed each m...