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정석윤(Jeong Seok Yun),남세일(Nam Se Il),홍석(Hong Seok),한창희(Han Chang Hee) 한국전자거래학회 2006 한국전자거래학회지 Vol.11 No.1
과학기술의 발달과 산업의 변화에 따라 미래에 대한 연구가 중요시 여겨지고 있다. 그리고, 유비쿼터스 환경과 스마트 환경의 도래에 따라 어떠한 기술이 중요한지, 어떤 핵심기술이 발전할 것인지, 미래의 변화 모습은 어떠한지 등에 대한 미래예측이나 미래기술에 대한 예측이 필요한 실정이다. 이미 각 국에서는 국가차원에서 과학기술 전분야에 걸쳐 기술예측 활동을 추진해오고 있으나, 민간부문에서는 많은 시간과 비용이 소요되고 단기간에 성과를 내기가 힘들기 때문에 미래기술의 예측 활동을 추진하기가 쉽지 않은 것이 현실이다. 또한, 대부분의 미래기술의 예측 방법들이 국가 차원의 대규모 프로젝트에 적합하게 개발되어져 있어서 기업의 기술예측 활동에 별로 도움이 되지 못하고 있다. 이에 따라 본 연구에서는 기업입장에서 활용하기에 용이한 기슬예측 방법론을 개발하였으며. 제안된 방법론에 따라 직접 예측활동을 수행하고 사례로써 제시하고자 한다. 제시된 방법론은 FAR, Furture Wheel, 시나리오 기법등을 기초로 하여 개발되어졌으며, 미래기술의 수요자인 고객을 중심으로 방법론을 전개한다. Due to the technological developments and industrial changes, studying for the future has been attached great importance. According to the forthcoming ubiquitous computing environment or smart environment, it is necessary for a country and an enterprise to forecast the future or foresight the future technologies. Although many countries have been doing the foresight, it is difficult for the enterprise to try future foresight activity, because the foresight activity needs lots of the costs and time for good results. Also, almost methodologies used in foresight are suitable for country level foresight projects. In this research, a methodology is developed for an enterprise to use easily, and a case based on the proposed methodology is presented. The proposed foresight methodology is developed based on the traditional forecasting methods, FAR, Future Wheel, and Scenario. Especially, the methodology focused on the customers of a company.
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단일 및 이중명령을 수행하는 자동창고 시스템의 성능분석
남진규(Jin-Gyu Nam),허선(Hur Sun),정석윤(Seok-Yun Jeong),김정기(Jeong-Kee Kim) 한국산업경영시스템학회 2004 한국산업경영시스템학회지 Vol.27 No.3
We consider an AS/RS(Automated Storage/ Retrieval System) which performs both of single and dual commands. The service times of single and dual commands are assumed to be differently distributed. Steady-state probabilities at the service completion epochs are calculated. Then, we transform the arrival rates of storage and retrieval commands into those of single and dual commands. Using this, we propose a non-preemptive queueing model with priority for the performance analysis of an AS/RS, and obtain approximated means of queue lengths and waiting times.
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허선(Sun Hur),주국선(Kook-Sun Joo),정석윤(Seok-Yun Jeong),윤주덕(Joo-Deok Yun) 대한산업공학회 2010 대한산업공학회지 Vol.36 No.2
In this paper, we consider the information processing system, which organizes the collected data to meaningful information when the number of data collected from multiple sources reaches to a predetermined number, and performs any action by processing the collected data, or transmits to other devices or systems. We derive an analytical model to calculate the time until it takes to process information after starting to collect data. Therefore, in order to complete the processing data within certain time constraints, we develop some design criteria to control various parameters of the information processing system. Also, we analyze the discrete time model for packet switching networks considering data with no particular arrival nor drop pattern. We analyze the relationship between the number of required packets and average information processing time through numerical examples. By this, we show that the proposed model is able to design the system to be suitable for user’s requirements being complementary the quality of information and the information processing time in the system with time constraints.
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마코프 재생과정을 이용한 ATM 트래픽 모델링 및 성능분석
정석윤,허선 한국경영과학회 1999 韓國經營科學會誌 Vol.24 No.3
In order to build and manage an ATM network effectively under several types of control methods. It is necessary to estimate the performance of the equipments in various viewpoints, especially of ATM multiplexer. As for the method to model the input stream into the ATM multiplexer, many researches have been done to characterize it by, such as, fluid flow, MMPP(Markov Modulated Poisson Process), or MMDP(Markov Modulated Deterministic Process). We introduce and MRP(Markov Renewal Process) to model the input stream which has proper structure to represent the burst traffic with high correlation. In this paper, we build a model for aggregated heterogeneous ON-OFF sources of ATM traffic by MRP. We make discrete time MR/D/1/B queueing system, whose input process is the superposed MRP and present a performance analysis by finding CLP(Cell Loss Probability). A simulation is done to validate our algorithm.
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