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콜드체인 시스템의 센서태그 운영 최적화를 위한 DEVS 기반 시뮬레이션 모델
류옥현(Okhyun Ryou),강용신(Yong-Shin Kang),진희주(Heeju Jin),이용한(Yong-Han Lee) 대한산업공학회 2015 대한산업공학회지 Vol.41 No.2
The application of radio frequency identification (RFID) sensor-tags in cold chain systems has recently received a great deal of attention. To design cold chain systems with RFID sensor-tags that minimize the initial investment and operational cost while fulfilling the functional and operational requirements, simulation study is one of the preferable and effective approaches. To simulate the possible design configurations, the individual components in a cold chain system can be extracted and implemented as a DEVS (Discrete Event System Specification) model. Based on the proposed DEVS model, a new cold chain simulation model can be efficiently created by simply connecting each DEVS model around the RFID sensor-tag of interest in sequence according to the structure of the cold chain system, and then executed (or simulated) on Java programming environments by the DEVSJAVA simulator. As a result of simulation, some key performance indexes such as reliability, accuracy or timeliness can be calculated and used to choose better components or to compare different system configurations of cold chain systems.
유비쿼터스 기술을 이용한 프레스 금형의 트라이아웃 관리시스템
최상수(SangSu Choi),양태호(TaeHo Yang),노상도(Sang Do Noh),진희주(HeeJu Jin),이용한(Yong-Han Lee),이인석(Inseok Lee),권성오(Sungoh Kwon) (사)한국CDE학회 2009 한국CDE학회 논문집 Vol.14 No.5
In these days, automotive companies are trying to develop new manufacturing technologies and paradigms for rapid product development and production. The press die development process account for 40% of entire vehicle development process, and tryout process usually takes 3 to 4 months, and it is the biggest time portion out of dies manufacturing. Therefore, the effective tryout management system is essential to reduce time and cost of automotive press die production. This paper suggests improved process and practical application of tryout management using ubiquitous technology, and shows the results such as shorten time, improved quality and supporting of lifecycle engineering of press die.