• 대한안전경영과학회지
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• 제10권3호
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• pp.1-8
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• 2008

Risk is the probability of an adverse event given exposure to hazard. There are many reason for unsafety situation without safety operation. The reason is no safety evaluation system in small enterprise. And then this study purposes safety management activities that is evaluation system for total safety efficiency's maximization. Therefore, in this study, this model that can evaluate quantitative activities in small enterprise that maximize safety efficiency wishes to do design using balanced scorecard. In other words, this study aims to suggest a performance measurement model reflecting the characteristics of safety evaluation system, especially the model for return manufacturing related to safety, and to develop the S-BSC(Safety-Balanced ScoreCard) measurement model using a weight lifetime value to which a relative weight is applied by using AHP based on the BSC.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제5권4호
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• pp.310-315
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• 2005

This paper proposes a fast optimization method by combining queen-bee evolution and derivative evaluation in genetic algorithms. These two operations make it possible for genetic algorithms to focus on highly fitted individuals and rapidly evolved individuals, respectively. Even though the two operations can also increase the probability that genetic algorithms fall into premature convergence phenomenon, that can be controlled by strong mutation rates. That is, the two operations and the strong mutation strengthen exploitation and exploration of the genetic algorithms, respectively. As a result, the genetic algorithm employing queen-bee evolution and derivative evaluation finds optimum solutions more quickly than those employing one of them. This was proved by experiments with one pattern matching problem and two function optimization problems.

• 산업경영시스템학회지
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• 제21권46호
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• pp.173-180
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• 1998

In conventional probability-based quality evaluation of products with qualitative characteristics, many factors that affect the evaluation are not easily represented quantitatively, because the relation between reliability of human evaluator and each of these factors is not clear. In order to evaluate the quality of product with qualitative characteristics quantitatively, in this paper, the relation is represented as the shape of possibility distribution function of fuzzy set on the interval [0,1]. Furthermore, fuzzy reasoning is used to obtain the estimates of quality characteristics. And, it is supposed that many quality characteristics affected by the above factors are connected with the final characteristic through hierarchical structures. Finally, using the estimates gained from the final evaluation, qualitative characteristics are evaluated by use of concept of pattern recognition.

• 한국구조물진단유지관리공학회 논문집
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• 제2권4호
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• pp.194-200
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• 1998

Risk, probability of failure, which includes various uncertainties and influential factors of performance should be accounted for in engineering system. Recently, several different methods to analysis risk evaluation evolved and one of the practical method is FOSM (First Order Second Moment Method ). FOSM method is derived in terms of terms coefficient of variance to uncertainties which influence various factor. For risk evaluation and uncertainty analysis in hydraulic design system, load-capacity relationship is adopted in this paper. Sample catchment with design of sewer system is applied, which plots safety factor vs. risk. Risk evaluation and uncertainty analysis are very to important develop optimal design model in hydraulic system

• 한국안전학회지
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• 제11권4호
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• pp.42-48
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• 1996

Since the fatigue phenomenon is characterized as a probability feature and test data cannot be easily collected number its small sample data are uncertain. Therefore, statistical evaluation methods should necessarily be introduced into data evaluation. With such a basic concept in mind, this study attempted to apply conventional statistical processing methods to the fatigue data and thereby present a new evaluation method in consideration of the fact that the fatigue test is usually performed within a limited number. That is a package evaluation method was adopted which co-realtes parameters between different levels of capacity in E-N or S-N level. So far fatigue limits have been found by means of stiarcase method. But it was also disclosed that this new method has its own disadvantage because limited frequencies are not duely considered.

• 한국지능시스템학회논문지
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• 제13권4호
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• pp.439-447
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• 2003

본 논문에서는 유전자 알고리즘의 성능향상을 위한 비례-적분-미분 평가방법을 제안한다. 비례-적분-미분 평가방법에서는 평가함수에 의하여 계산된 적합도와 더불어 각 개체의 부모 적합도, 초기세대로부터 이전세대까지의 최소, 최대 적합도를 이용하여 평가함으로서 유전자 알고리즘의 성능저하를 가져오는 조숙수렴 (premature convergence) 확률을 줄여주어 결과적으로 유전자 알고리즘의 성능을 향상시키게 된다. 비례-적분-미분 평가방법의 성능을 보이기 위하여 유전자 알고리즘 성능 검증에 많이 사용되어온 대표적인 함수 최적화 문제들을 적용하여 실험해본 결과 제안한 방법이 유전자 알고리즘의 성능을 크게 향상 시킬 수 있음을 확인하였다. 제안한 평가방법은 다른 형태의 유전자 알고리즘의 성능향상을 위해서도 쉽게 적용될수 있다.

• 한국철도학회논문집
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• 제9권4호
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• pp.432-440
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• 2006

Prior to the service evaluation, many kinds of its attributes must be identified on the basis of rational decision owing to complexity and ambiguity inherent in logistics service. there are so many evaluation methods but they are not applicable to logistics service the have property of non-additivity and overlapped attributes. Therefore, probability measure can not used to evaluate logistics service but Fuzzy Measure is required. And the method should be easy to calculate it Recently Fuzzy theory has been applied in Various evaluation problem. Fuzzy evaluation based on Fuzzy theory can accommodate fuzziness in judgement with people through introducing Fuzzy Measure. In this paper, Hierarchical Fuzzy Process is applied to evaluate level of logistics service in Korail and the biggest six logistics companies in the korea which is called 3PL Company. Also Fuzzy Relation Equation which is problem identifying evaluation value at these fuzzy evaluation is applied to verify relation between Input and Output data through @-operation. Therefore, we apply this Fuzzy Relation Equation to Hierarchical Fuzzy Process and verify evaluation value which objects of evaluation are able to possess.

• 한국수자원학회논문집
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• 제42권10호
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• pp.857-866
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• 2009

본 연구에서는 전국의 30년 이상의 강우관측기록을 보유하고 있는 기상청 산하 56개 강우관측소의 연 최대치 강우자료들로부터 확률분포형에 대하여 모멘트법, 최우추정법, 확률가중모멘트법을 이용하여 모수를 추정하고, 그 모수의 범위와 확률변수의 범위에 대한 적정성을 알아보았다. 적정성이 있는 모수를 대상으로 적합도 검정법인 x$^2$-검정, K-S검정, Cramer von Mises (CVM)검정, Probability Plot Correlation Coefficient (PPCC) 검정을 실시한 결과 중, 최근 연구에서 많이 이용되고 있고 표본자료의 크기가 작거나 왜곡된 자료일 경우에도 비교적 안정적인 결과를 얻을 수 있는 확률가중모멘트법과 상관계수에 의한 검정인 PPCC검정을 통과한 분포형을 우선적으로 적합도 평가 대상 분포형으로 선정하였다. 선정된 분포형을 대상으로 적합도 평가기준인 SLSC, MLL, AIC를 적용하여 적합도 평가를 실시하여 대표확률분포형 후보군을 추출하였다. 대표확률분포형 후보군으로 선정된 확률분포형에 대하여 resampling방법인 Jackknife기법을 적용하여 변동성을 파악하고, 변동성이 가장 작게 나타난 분포형을 그 지점의 대표확률분포형으로 결정하였다. 본 논문에서는 분석 결과의 분량을 감안하여 대표적으로 서울, 강릉, 대구, 전주, 부산 지점에 대해 작성하였으며, 확률강우량의 변동성이 가장 작은 확률분포형을 56개 지점의 각 지점 대표확률분포형으로 제시하였으며, Gumbel 분포(GUM)의 선정 비율이 지속기간 12시간, 24시간에 대해 각각 41 %, 32 %로 가장 높게 나타났다. 본 연구에서는 적합도 평가를 함에 있어서 객관적 정량화가 가능한 세 가지 기준과 Jackknife기법을 이용한 새로운 확률분포형 선정의 가능성을 제시하였다.

• 한국정보과학회논문지:데이타베이스
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• 제28권4호
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• pp.688-701
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• 2001

웹 캐쉬는 웹 응용의 성능향상을 위한 중요한 문제가 되었다. 본 논문에서는 웹 데이타에 부여 되는 만기시간(expiration time을 활용하여 웹 캐쉬의 성능을 향상시키는 방법을 제안한다. 먼저, 기존 캐 쉬 교체 알고리즘에서 사용된 참조확률에 만기시간의 영향을 반영한 유효참조확률(effective referenceprobability)의 개념을 제시한다. 그리고, 유효참조확률을 정형적으로 정의한 후, 확률적 모델 하에서 이 론적으로 유도한다. 기존의 교체 알고리즘에서 참조확률을 유효탐조확률로 대체하면 기존 교체 알고리즘에만기시간의 영향을 반영할 수 있다. 성능평가 결과, 유효참조확률을 사용한 알고리즘이 그렇지 않은 알고 리즘보다 항상 우수한 결과를 보였다. 이것은 제안한 방법이 만기시간을 고려하여 캐쉬효과를 얻을 이론적 인 확률을 정확히 반영한 방법으로서, 만기시간의 영향을 보다 효과적으로 반영하기 때문이다. 특히, 유효 참조확률은 캐쉬비율이 0.05이고 갱신이 비교적 자주 일어날 경우(갱신횟구가 참조횟수의 1/10이상인 경우)에 LRU-2의 경우 30% 이상. Aggarwal의 방법(refresh overhead factor가 통합된 PSS)의 경우 13%이상 성능을 개선하였다. 이 같은 결과는 유효참조확률이 만기시간이 주어지는 웹 캐쉬에서 크게 성능을 개선할 수 있음을 보여주고 있다.

• 한국농공학회논문집
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• 제57권3호
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• pp.101-108
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• 2015

The purpose of this study was to evaluate the safety of the small reservoir, which is distributed in a rural area, based on systemic reliability. It has been estimated that safety of respective reservoir the calculation of failure probability for individual reservoirs can evaluate the safety of the reservoir of the study area. The change of safety for watershed could be figured out as that result. Probability of failure was increased from $3.90{\times}10^{-5}$ to $1.35{\times}10^{-4}$ in Naesu-inpyung reservoir, from $1.33{\times}10^{-5}$ to $4.77{\times}10^{-5}$ in Buyeon reservoir and from $4.24{\times}10^{-5}$ to $2.55{\times}10^{-2}$ in Dalakmal respectively. From the results, the collapse of the upper stream reservoir was analyzed qualitatively that may affect the safety of the reservoir on the downstream area.