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Dedy Achmad Kurniady,Asep Denih,Tri Rijanto,Elena Igorevna Artemova,Huynh Tan Hoi,Liu Zhaojun,Lilis Holisoh Nuryani,Aan Komariah 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.2
In this paper, the scheduling of the flexible flow shop scheduling problem without unemployment is considered by considering the sequence-dependent preparation times with parallel and identical machines in each workstation in order to minimize the maximum completion time that has been done so far. The assumption of the existence of sequence-dependent preparation times has not been observed in the literature on the issue of flexible workflow without unemployment. In this study, a mixed integer programming model for the problem is first developed. Since the problem under study is one of the NP-hard problems and the mathematical model solving software is not able to obtain the optimal solution of relatively large problems at a reasonable time, to provide a meta-heuristic method of genetic algorithm to obtain optimal solutions or close to optimal for the problem. The computational results show the relatively good performance of the genetic algorithm for solving problems in less time than the mathematical programming model.
Yan Li,Naisen Yu,Haiou Li,Dedi Liu,Yunfeng Wu 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.6
In this paper, a novel individual multiple-junction network structure is fabricated using low temperature aqueous method. In comparison with the same growth method without NaF adding, the Fluorine doped ZnO photodetector presents multiplejunctionnetwork structure and ultraviolet (UV)/Blue dual band photoresponse performances. The results indicate the method can simultaneously promote self-assembled growth and improve the photoresponse properties. Moreover, it will provide a simple and low cost way to assemble multiple nanowires for photoresponse applications.