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Deciding the Optimal Shutdown time of a Nuclear Power Plant
양희중,Yang, Hee-Joong 대한산업공학회 2000 산업공학 Vol.13 No.2
A methodology that determines the optimal shutdown time of a nuclear power plant is suggested. The shutdown time is decided considering the trade off between the cost of accident and the loss of profit due to the early shutdown. We adopt the bayesian approach in manipulating the model parameter that predicts the accidents. We build decision tree models and apply dynamic programming approach to decide whether to shutdown immediately or operate one more period. The branch parameters in decision trees are updated by bayesian approach. We apply real data to this model and provide the cost of accidents that guarantees the immediate shutdown.
양희중(Hee-Joong Yang),임준민(June-Men Im) 한국산업경영시스템학회 2005 한국산업경영시스템학회지 Vol.28 No.4
RFID is a technique that plays an important role in identifying and tracking the movement of objects by inserting small chips in objects. It is somewhat similar to bar codes from the various points of applications, but is hopefully considered to lead to tremendous development by solving the present drawbacks of bar codes such as slow identification. Speed, low rate of identification, limitation on the distance of identification and on the amount of saving capacity. Through the development of RFID technique, revolutionary growth is anticipated in the area of logistics and commodity distributional systems. Futhermore, the self processing RFID makes the communications between man and objects possible, and through which introduction of ubiquitous atmosphere will be accelerated. Therefore RFID is considered as one of the most attracting area of investment by developed countries as well as Korea. In this paper, we analyze the world wide tendency on RFID, and propose the conditions for activating RFID industry and also suggest directions for national strategy for diffusing RFID.
양희중(Hee-joong Yang) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.3
We use influence diagrams to describe event trees used in safety analyses of low-probability high-risk incidents. This paper shows how the branch parameters used in the event tree models can be updated by a bayesian method based on the observed counts of certain well-defined subsets of accident sequences. We focus on the analysis of the shared branch parameters, which may frequently often in the real accident initiation and propagation to more severe accident. We also suggest the way to utilize different levels of accident data to forecast low-probability high-risk accidents.
A Forecasting and Decision Model that Incorporates Accident Risks
양희중(Hee-Joong Yang),이근부(Keun-Boo Lee),오세호(Se-Ho Oh) 한국산업경영시스템학회 2004 한국산업경영시스템학회지 Vol.27 No.4
사고 위험성올 고려한 예측 및 의사결정 모형을 구축한다. 시스템을 즉시 운행중지 할 것인지 혹은 계획된 일정 기간을 더 운행 한 후 다시 의사결정을 내릴 것인지를 판단하는 방법론에 대해 연구한다. 의사결정을 내라는데 있 어시 비용 및 위험에 대한 새로운 정보가 입수되는 대로 이를 반영한다. 예측 오형을 통해 분석된 결과들을 활용해 보다 나은 의사결정을 내리는 방법에 대해 연구한다.
오세호(Se-Ho Oh),이근부(Keun-Boo Lee),양희중(Hee-Joong Yang) 한국산업경영시스템학회 2005 한국산업경영시스템학회지 Vol.28 No.1
This paper deals with a batch processor model in which the batch processing times depend on the jobs assigned to the batch. Each job has a distinct processing time which is determined as not the exact value but the range from the lower limit to the upper, which makes it possible to group several jobs into the same batch. In point of this flexibility our model can be referred to as the generalization of the bum-in model in which the upper limit of each job is unbounded. The jobs to be scheduled may be available nonsimultaneously. Therefore they have different ready times. We develop the model to describe the problem situation and the heuristic methods to minimize the total tardiness. And our batching rule is compared with other dispatching ones.
양희중 청주대학교 산업과학연구소 2021 産業科學硏究 Vol.38 No.2
In the Korea Institute for Animal Products Quality Evaluation, several graders are making judgments on the grades of livestock. However, since the ratings of each graders are not complemented and corrected independently, there may be doubts about whether the fairness and consistency of ratings are secured. If a grader who is judged to have a problem in grading compared to other graders has been selected, they must be educated so that they can maintain consistent grade stringency with other graders in the future. As for the method of education, it is not the main purpose of this paper, but it is necessary to check whether graders who participated in education have improved their ability to make consistent judgments. In this paper, we present a method to check if the improvement after education has been achieved. It possible to select graders whose grade disposition is significantly different from other graders by applying the method for selecting abnormal graders suggested through this study. After the above graders are selected, education will be conducted, and the method of analyzing the results of this education has been developed. Efforts to reduce the deviation of grades among graders should be continued by repeating the selection and education presented in this paper.