帶運輸機的流水調度的復雜性研究
[Abstract]:The pipelining scheduling problem (flow shop) is the key problem model of scheduling algorithm research in recent decades, and it is also a kind of model involved in the workshop production process. Pipelining scheduling problem can be defined as: there are m processors to handle n jobs, each job has a certain processing time on each processor, all jobs have the same processing sequence, each processor only handles one process. And each processor can only deal with one job at a time. The goal of this problem is to obtain a feasible scheduling method to minimize the time it takes to complete all jobs. Many previous literatures have studied the problem, but most of the studies are hypothesized ideal model of the problem, either neglecting the transport time between two processors or considering that the capacity of the transport aircraft responsible for transport is infinite. In this paper, the transport time and capacity of the transporter are explicitly considered, and the computational complexity of the model is analyzed and studied. In this paper, the pipeline scheduling problem with two processors and one transporter is studied. In this problem, two processors A and B process n jobs, which are processed serially on each processor, and their processing time on each processor is determined, and all jobs must first be processed on processor A. Then it was transported to processor B for processing, and a transporter was responsible for transporting the operation from processor A to processor B. the transport time was independent of the operation. Each processor has unlimited cache areas to store pending and processed jobs. In this paper, the computational complexity of three problem models with capacity of 1, capacity of 2 and capacity of more than or equal to 3 is discussed. When the capacity of the transporter is 1 and the capacity is greater than or equal to 3, it has been proved to be a strong NP-hard problem in the previous research results. This paper reconstructs an example by changing the transportation time condition. The two models are proved to be strong NP-hard problems by a more detailed analysis process, and the equivalence of the two methods is also illustrated. The problem model with transport plane capacity of 2 has been an open problem in the past literature, and there is no special research on it, but I have already proved that this problem is a strong NP-hard problem in a paper to be published last year. This paper focuses on the equivalence of the proof method and the proof method of the model with capacity 1. Finally, the pipelining scheduling model with two processors is studied, in which the transport time depends on the processing time of the operation, and the transport time of each job is analyzed to be twice the processing time of each job on the first processor. We prove that the problem is solvable and give an algorithm to extend Johnson's rule to solve the problem.
【學位授予單位】:大連理工大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TB497
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