in this paper a new problem of three stage disassembly-assembly scheduling is introduced and reviewed. this problem, which was arisen from the aviation industry characteristics, is a generalization of the two stage assembly scheduling problem. products (helicopters) in the aviation industry return to assembler for annual overhaul repair services. in the first stage helicopters are disassembled ...

In this paper we discuss stochastic Economic Lot Scheduling Problems (ELSP), i.e., settings where several items need to be produced in a common facility with limited capacity, under significant uncertainty regarding demands, production times, setup times, or combinations thereof. We propose a class of production/ inventory strategies for stochastic ELSPs and describe how a strategy which minimi...

In the process industry, both quality and consistency of mid-term planning and short-term scheduling are crucial. We propose a sequential approach consisting in three steps : planning, lot streaming-pegging, and scheduling. This paper focuses on the intermediate problem that consists in cutting up the planned production in several lots (lot streaming) and linking stocks, lots and demands by det...