in this paper, we consider a flow shop scheduling problem with availability constraints (fsspac) for the objective of minimizing the makespan. in such a problem, machines are not continuously available for processing jobs due to preventive maintenance activities. we proposed a mixed-integer linear programming (milp) model for this problem which can generate non-permutation schedules. furthermor...

a significant portion of gross domestic production (gdp) in any country belongs to the transportation system. transportation equipment, in the other hand, is supposed to be great consumer of oil products. many attempts have been assigned to the vehicles to cut down greenhouse gas (ghg). in this paper a novel heuristic algorithm based on clark and wright algorithm called green clark and wright (...

Linda Gel85, CG89] is a coordination language providing generative communication via tuple spaces. Each tuple space is a global associative memory consisting of a bag (or multi-set) of tuples, where the tuples are variable-sized objects. Repeated insertions and removals of variable-sized tuples are liable to result in the memory containing several small areas of free memory to which larger, var...

This paper presents a novel, integer-linear programming (ILP) model for an identical parallel-machine scheduling problem with family setup times that minimizes the total weighted flow time (TWFT). Some researchers have addressed parallel-machine scheduling problems in the literature over the last three decades. However, the existing studies have been limited to the research of independent jobs,...

Key British scientists were invited to a 'power' breakfast last month to discuss with no less than five ministers their views on how science policy can be developed. And in the chancellor's later annual budget statement, the government underlined its wish to see investment in science as a key to future prosperity. But future money will not all be coming from the government: there are growing ef...

Lean Production is one of the current issues in logistics (Womack, 2004). Clocked production and transport effect an adjustment of the individual process steps. Today only large companies are able to raise enough transport volume for an individual transport solution and so assure the resulting advantages of decreasing storage costs and capital lockup. An individually clocked transport in small ...

Project portfolio selection is very important subject of decision-makers in project-based organizations. The best assignment of resources to the most appropriate projects is necessary as financing projects with low benefit is just waste of organization's resources. However, existing project selection models pay not much attention the structure and special features of projects as a selection cri...