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최소수리 블록교체 모형을 활용한 상태기반 보전 정책 연구
임준형,원동연,심현수,박철홍,고관주,강준규,김용수,Lim, Jun Hyoung,Won, Dong-Yeon,Sim, Hyun Su,Park, Cheol Hong,Koh, Kwan-Ju,Kang, Jun-Gyu,Kim, Yong Soo 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.2
Purpose: This study proposes a process for evaluating the preventive maintenance policy for a system with degradation characteristics and for calculating the appropriate preventive maintenance cycle using time- and condition-based maintenance. Methods: First, the collected data is divided into the maintenance history lifetime and degradation lifetime, and analysis datasets are extracted through preprocessing. Particle filter algorithm is used to estimate the degradation lifetime from analysis datasets and prior information is obtained using LSE. The suitability and cost of the existing preventive maintenance policy are each evaluated based on the degradation lifetime and by using a minimum repair block replacement model of time-based maintenance. Results: The process is applied to the degradation of the reverse osmosis (RO) membrane in a seawater reverse osmosis (SWRO) plant to evaluate the existing preventive maintenance policy. Conclusion: This method can be used for facilities or systems that undergo degradation, which can be evaluated in terms of cost and time. The method is expected to be used in decision-making for devising the optimal preventive maintenance policy.
임준형 ( Joon Hyoung Lim ),명성준 ( Sung-jun Myung ),김재영 ( Jae-young Kim ) 한국지식경영학회 2017 지식경영연구 Vol.18 No.3
As an interest in the efficiency of public sector expenditures has spread across the world, Korea has operated a self-evaluation system for government projects as a part of the performance-based budget system. However, an evaluation system for public information technology project has been criticized for its lack of validity, which stems from the uniformity of performance management. This study draws insight from knowledge management literature in an attempt to address the problems with the extant performance evaluation system in public agencies. To realize benefits from IT investment, an agency needs to develop its own performance management model for information systems projects, with a focus on the interaction of IT and organizational system. The knowledge management-based framework for IT projects was verified through a case study, with which we discussed the applicability of knowledge management to the evaluation of public information systems projects.
베이지안 기법에 기반한 수명자료 분석에 관한 문헌 연구
원동연(Dong-Yeon Won),임준형(Jun Hyoung Lim),심현수(Hyun Su Sim),성시일(Si-il Sung),임헌상(Heonsang Lim),김용수(Yong Soo Kim) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.3
Purpose: The purpose of this study is to arrange the life data analysis literatures based on the Bayesian method quantitatively and provide it as tables. Methods: The Bayesian method produces a more accurate estimates of other traditional methods in a small sample size, and it requires specific algorithm and prior information. Based on these three characteristics of the Bayesian method, the criteria for classifying the literature were taken into account. Results: In many studies, there are comparisons of estimation methods for the Bayesian method and maximum likelihood estimation (MLE), and sample size was greater than 10 and not more than 25. In probability distributions, a variety of distributions were found in addition to the distributions of Weibull commonly used in life data analysis, and MCMC and Lindley’s Approximation were used evenly. Finally, Gamma, Uniform, Jeffrey and extension of Jeffrey distributions were evenly used as prior information. Conclusion: To verify the characteristics of the Bayesian method which are more superior to other methods in a smaller sample size, studies in less than 10 samples should be carried out. Also, comparative study is required by various distributions, thereby providing guidelines necessary.
선물편의는 위험할증에 원인을 두는가? ( 경제학문헌목록 주제분류 : F3 )
모수원(Soo Won Mo),임준형(Jun Hyoung Lim) 한국경제학회 1999 經濟學硏究 Vol.47 No.1
본고는 선물편의의 원인이 어디에 있는가를 밝히는 데 목적을 두고 있다. 선물환율의 불편추정치가설은 무위험할증가설과 합리적 기대가설의 결합가설이기 때문에 선물편의는 시장의 기대가 비합리적인 경우와 위험할증이 존재하는 경우 그리고 양자의 결합으로 발생할 수 있 다. 이에 대한 답을 구하기 위하며 먼저 GARCH모형을 이용하여 위험할증이 존재하는가를 살펴본다. 아울러 공적분과 오차수정모형을 통하여 시장의 실패를 밝히는 기존의 문헌과 달 리 본고에서는 선물환율에서 위험할증을 제거하는 방법을 통하여 선물편의가 위험할증에 위 해서 뿐만 아니라 합리적 기대가설의 기각에 따르는 시장의 실패에도 원인을 둔다는 것을 밝힌다. 또한 공적분에 있어서도 기존의 정수차분의 Engle-Granger와 Johansen기법은 정상성 과 비정상성으로만 구분함으로써 추세회귀적 성향을 갖는 경우 비정상적 것으로 처리하는 단점이 있기 때문에 이러한 문제점을 극복하기 위하여 분수차분에 의한 GPH검정기법을 도입 한다.