In this paper we consider the so-called type-I assembly line balancing problem (ALBP-I), in which the objective is to minimize the number of workstations needed for a given cycle time. ALBP-I is one of the well-known NP-hard problems in operations management, and many optimal approaches (including 0-1 integer programming model, branch and bound algorithm, dynamic programming model, etc.) have b...

In this paper we motivate the use of a declarative programming style and the use of massive parallel computing systems to model control strategies in concurrent systems. The simpliied formulation of system components and their interaction permits to generate a rapid prototype of the system. Based on this prototype, a rst simulation of the modeled strategies and the system is done on a massive p...

In this paper, the problem of sequencing machines in the final assembly line with regard to the supply of parts has been investigated. For this reason, a basic integer linear programming model has been developed and based on this, the problem-solving algorithm is developed in accordance with the reaction-based approach based on the renewal of the sequence of operations. Also, due to the Np-hard...

In project scheduling studies, to the best of our knowledge, hyper-heuristic collaborative is first-time applied with random activity durations. A based ensemble genetic programming (HH-EGP) method proposed for solving stochastic resource constrained problem (SRCPSP) by evolving an priority rules (PRs). The approach features (1) integrating critical path into resource-based policy class generat...

mathematical modeling of supply chain operations has proven to be one of the most complex tasks in the field of operations management and operations research. despite the abundance of several modeling proposals in the literature; for vast majority of them, no effective universal application is conceived. this issue renders the proposed mathematical models inapplicable due largely to the fact th...

a linear programming model has been presented for finding an appropriate planning in order to maximize hotel revenue. in this model, a special planning horizon has been considered that includes several busy days of a year. there are several reservation periods that may start a few months earlier. each period of reservation may have different prices and so result different incomes. hotel custome...

This paper discussed the scheduling problem of outpatients in a radiology center with an emphasis on priority. To more compatibility to real-world conditions, we assume that the elapsed times in different stages to be uncertain that follow from the specific distribution function. The objective is to minimize outpatients’ total spent time in a radiology center. The problem is formulated as a fle...

Humanitarian organizations pre-position relief items in pre-disaster and distribute them to the affected areas in post-disaster. Improper planning of emergency operations causes more deaths in post-disaster. In this paper, the problem of relief item pre-positioning and multi-period distribution planning is addressed considering lateral transhipment among distribution centres to improve the effi...

In this paper we develop a multi-objective model to optimally control the lead time of a multistage assembly system. The multistage assembly system is modeled as an open queueing network, whose service stations represent manufacturing or assembly operations. The arrival processes of the individual parts of the product, which should be assembled to each other in assembly stations, are assumed to...