• 제목/요약/키워드: empirical evaluation

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A Study on Feasibility Evaluation for Prognosis Systems based on an Empirical Model in Nuclear Power Plants

  • Lee, Soo Ill
    • International Journal of Safety
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    • 제11권1호
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    • pp.26-32
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    • 2012
  • This paper introduces a feasibility evaluation method for prognosis systems based on an empirical model in nuclear power plants. By exploiting the dynamical signature characterized by abnormal phenomena, the prognosis technique can be applied to detect the plant abnormal states prior to an unexpected plant trip. Early $operator^{\circ}{\emptyset}s$ awareness can extend available time for operation action; therefore, unexpected plant trip and time-consuming maintenance can be reduced. For the practical application in nuclear power plant, it is important not only to enhance the advantages of prognosis systems, but also to quantify the negative impact in prognosis, e.g., uncertainty. In order to apply these prognosis systems to real nuclear power plants, it is necessary to conduct a feasibility evaluation; the evaluation consists of 4 steps (: the development of an evaluation method, the development of selection criteria for the abnormal state, acquisition and signal processing, and an evaluation experiment). In this paper, we introduce the feasibility evaluation method and propose further study points for applying prognosis systems from KHNP's experiences in testing some prognosis technologies available in the market.

MEASURING THE INFLUENCE OF TASK COMPLEXITY ON HUMAN ERROR PROBABILITY: AN EMPIRICAL EVALUATION

  • Podofillini, Luca;Park, Jinkyun;Dang, Vinh N.
    • Nuclear Engineering and Technology
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    • 제45권2호
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    • pp.151-164
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    • 2013
  • A key input for the assessment of Human Error Probabilities (HEPs) with Human Reliability Analysis (HRA) methods is the evaluation of the factors influencing the human performance (often referred to as Performance Shaping Factors, PSFs). In general, the definition of these factors and the supporting guidance are such that their evaluation involves significant subjectivity. This affects the repeatability of HRA results as well as the collection of HRA data for model construction and verification. In this context, the present paper considers the TAsk COMplexity (TACOM) measure, developed by one of the authors to quantify the complexity of procedure-guided tasks (by the operating crew of nuclear power plants in emergency situations), and evaluates its use to represent (objectively and quantitatively) task complexity issues relevant to HRA methods. In particular, TACOM scores are calculated for five Human Failure Events (HFEs) for which empirical evidence on the HEPs (albeit with large uncertainty) and influencing factors are available - from the International HRA Empirical Study. The empirical evaluation has shown promising results. The TACOM score increases as the empirical HEP of the selected HFEs increases. Except for one case, TACOM scores are well distinguished if related to different difficulty categories (e.g., "easy" vs. "somewhat difficult"), while values corresponding to tasks within the same category are very close. Despite some important limitations related to the small number of HFEs investigated and the large uncertainty in their HEPs, this paper presents one of few attempts to empirically study the effect of a performance shaping factor on the human error probability. This type of study is important to enhance the empirical basis of HRA methods, to make sure that 1) the definitions of the PSFs cover the influences important for HRA (i.e., influencing the error probability), and 2) the quantitative relationships among PSFs and error probability are adequately represented.

경영정보학 연구에 나타난 실증적 연구방법 적용상의 문제: 평가를 통해 얻은 교훈 (Application of Empirical Research Methods in Information Systems Research: Gaining Lessons Through Evaluation)

  • 강신철;이중기;최정일
    • Asia pacific journal of information systems
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    • 제16권2호
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    • pp.1-25
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    • 2006
  • Application of appropriate research methods has assumed an important role in knowledge accumulation endeavors in the scientific research community. The current study reported here summarizes how we used the empirical methods in IS research, what we need to improve in using empirical study as research methodology through the set of comprehensive research guideline. From the survey and review of seminal and classical research guidelines, we developed our own 28 checklist for research design, statistical analysis, and conclusion, which can be commonly applied to all articles that employ inferential statistical methods in IS research. Then, we critically evaluated the usage of empirical research methods in major IS journals by using the checklist, with the goal of improving the quality of academic papers. In this study, we scrutinized four major IS journals which published empirical papers from 1991 to 2000: MIS Quarterly, Journal of MIS, Information Systems Research, and Decision Sciences. As a result of intensive evaluation work, we could highlight many areas that are lagging and call for greater attention with regard to the proper usage of empirical study in IS research. The research findings in this study can be referred as checklist and guideline when IS researcher applies the empirical method.

실증검증을 통한 N/A 점검항목이 보안 수준 결과에 미치는 영향에 관한 연구 (An Study on the Impact of N/A Check Item on the Security Level Result through Empirical Verification)

  • 이준호;성경상;오해석
    • 정보처리학회논문지:컴퓨터 및 통신 시스템
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    • 제3권8호
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    • pp.271-276
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    • 2014
  • 본 연구는 취약점 분석 평가 수행 시 N/A 점검항목이 보안 수준 결과에 미치는 영향 정도를 분석하였다. 이를 위하여, 본 논문에서는 취약점 분석 평가 범위 및 점검항목과 정량적 산출 방식을 이용하였으며, 항목의 중요성에 따른 등급과 가중치를 부여하였다. 또한, 주위 환경과 IT 기술 발달로 기관은 항상 위험에 노출되어 있으므로 위험 허용 수준을 적용하여 실증적 분석을 수행하였다. 분석한 결과, N/A 점검항목이 보안 수준에 영향을 미치는 요인으로 증명되었다. 즉, 취약점 분석 평가 수행 시 기관 특성상 연계성이 없는 점검항목은 제외시켜야 하는 것을 알 수 있었다. 본 연구에서는 실증검증을 토대로 기관 특성과 연계성을 갖지 않는 항목을 제외한 후 보안 수준 평가를 수행해야 함을 시사 하였으며, 기관 특성을 고려한 취약점 분석 평가 점검항목 정립 모델 연구가 필요함을 제시하였다.

문헌정보학분야의 논문평가에 관한 고찰 (Review on Library Science Research Evaluation in Korea)

  • 이승채
    • 한국도서관정보학회지
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    • 제36권4호
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    • pp.199-210
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    • 2005
  • 본 연구에서는 우리나라 문헌정보학 논문들에 대한 평가내용들을 제시하고 과학적 연구와 질적 연구, 비실증적 연구 등에 관하여 논의하였다. 현재의 논문생산시스템을 제도적으로 보완하기 위해서는 개관적 연구분야의 활성화가 필요하다. 향후 이 분야의 활성화를 위하여 학회차원이나 학술진흥재단 차원에서 노력할 수 있을 것이다. 예컨대 Annual Review of Information Science and Technology와 유사한 학술지를 연간으로 발행할 수도 있고 기존학회지에 개관논문들을 게재하도록 장려할 수 있을 것이다. 각 분야의 권위자들이 한국의 도서관계에 도움을 줄 수 있는 연구내용을 정리하고 향후의 연구방향을 제시하면 그 파급효과는 상당히 클 것으로 예상된다.

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Kano 품질속성 평가방법론들의 실증적 비교분석 (An Empirical Comparative Analysis Between Kano and Improved Kano Methods)

  • 윤재욱;이희영
    • 품질경영학회지
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    • 제37권4호
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    • pp.31-42
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    • 2009
  • Various studies have been undertaken in order to effectively understand customer requirements. Kano proposed a dualistic approach, physical fulfillment and customer satisfaction, to differentiate Attractive, Must-be, One-dimensional quality attributes. As there were a few limitations on the Kano's method, researchers have proposed improved methods. However, there have been few empirical evidences that the improved methods are superior to the original Kano's method for identifying relevant quality attributes. The objective of this study is to provide a comparative study on Kano and improved Kanomethods based on empirical analysis of quality attributes on University services. For the analysis of the questionnaire formats, the Kano's original 5 scale questionnaire is more effective than improved methods, direct and 3 scale questionnaire. For the analysis of evaluation methods, the original Kano and Timko's method using the evaluation table are more effective than quantifying methods, Domouchel and Lim's methods.

광파이프 시스템의 채광성능 예측모델의 검증 및 적용 (Evaluation and Application of Prediction Models for the Daylight Performance of a Light-Pipe System)

  • 윤근영;신주영;김정태
    • KIEAE Journal
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    • 제10권1호
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    • pp.65-72
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    • 2010
  • The use of natural light has the potential for improving both the energy efficiency and indoor environmental quality in buildings. A light-pipe system can introduce daylight to spaces that would otherwise not be able to benefit from the advantages of daylight penetration. For the light-pipe system to be widely used in Korea, it is important to quantify its daylighting performance with due consideration regarding the effects imposed by the local climate conditions. This paper presents the evaluation results of existing semi-empirical models to predict daylighting performance of a light-pipe system. The evaluation of the existing models was based on the monitoring data obtained from a underground parking lot in which the light-pipe system was installed. Comparisons were made between the predicted and the monitored data obtained from the study. The results indicated that semi-empirical models which was developed using the experimental data obtained under the Korean climatic conditions had a good prediction performance. We also quantified the effects caused by sky conditions, solar altitudes, room dimensions, and the aspect ratio of a light-pipe system on both the daylighting performance of the light-pipe system and the indoor illuminance distributions of the space using the semi-empirical model. Finally, this paper provides the design guideline of the light-pipe system for its application to an underground parking lot space.

정보시스템 평가지표 개발에 관한 실증적 연구 : 공공부문을 중심으로 (An Empirical Study on Development of IS Evaluation Indices : In Case of Public Sectors)

  • 정해용;김상훈
    • 한국경영과학회지
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    • 제28권4호
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    • pp.155-189
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    • 2003
  • In this research, the comprehensive evaluation model of IS(information systems) for public sectors is theoretically constructed through reviewing and integrating previous IS evaluation-related research. This model is hypothesized to consist of five sectors(System Sector, User Sector, Organization and Management Sector, Resource Management Sector and Strategic Contribution Sector), ten evaluation items belonging to these five evaluation sectors, and sixty two evaluation indices for these ten evaluation items. The results of empirical analyses to test the validity of the research model show that the evaluation sectors turn out to be the same ones as proposed in the hypothetical model. The evaluation items(System Quality, Information Quality, Service Quality) in System Sector proves to be consistent with the hypothetical model. However, in case of User Sector, two evaluation items(Perceived Usefulness and User Satisfaction) which are included in the hypothetical model are found to be merged into one item(User Satisfaction). And, it is shown that four evaluation items such as the Efficiency of Internal Process, Customer Satisfaction, Organizational Innovation, and the Degree of Informatization competence improvement are included in Organization and Management Sector, differently from the research model in which the items, Organizational innovation and the Degree of Informatization competence improvement, are not divided. As a final result, sixty two evaluation indices that comprise all the evaluation items belonging to five sectors are found to be reduced to fifty seven ones through factor analyses, criterion-related validity tests and reliability analyses.

강철도 복합교량 케이블의 장력 평가기법에 관한 연구 (A Study on Evaluation Method of Cable Tension for Railway Steel Composite Bridge)

  • 최정열;이수재;정지승
    • 문화기술의 융합
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    • 제8권4호
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    • pp.407-413
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    • 2022
  • 본 연구에서는 약 3년간의 장기계측을 바탕으로 공용중인 복층 교량인 상부 도로교의 신축이음 신축량과 하부 철도교의 케이블 장력 간의 상관관계를 입증함으로서 온도변화에 따른 케이블 장력 평가 경험식을 제안하였다. 본 연구에서 제안한 케이블별 장력 평가 경험식을 이용한 장력 예측결과는 진동법을 이용한 장력과 3% 이내로 잘 일치하는 것으로 나타나 공용중인 케이블의 장력 예측 및 평가에 실험적인 기법인 진동법과 함께 적용이 가능할 것으로 판단되었다. 본 연구에서 제안한 신축량 경험식으로 산출한 추정온도를 케이블 경험식에 적용한 결과, 현장시험 진동법 측정결과와 비교시 높은 신뢰수준을 확보할 수 있을 것으로 분석되었다. 따라서 본 연구에서 제안한 추정온도를 반영한 장력 평가 경험식은 향후 기후변화에 따른 케이블의 장력 예측 및 유지관리방안 수립에 활용될 수 있을 것으로 판단된다.

도서관장애인서비스 품질요인의 실증적 평가에 대한 연구 (A Study on the Empirical Evaluation of Quality Factor on Library Service for the Disabled)

  • 배경재
    • 한국문헌정보학회지
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    • 제50권2호
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    • pp.271-287
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    • 2016
  • 본 연구는 이용자 중심의 도서관장애인서비스 품질요인을 실증적으로 고찰하고자 하였다. 품질요인의 실증적인 고찰을 위해 기존 도서관서비스의 품질 측정도구와 장애인서비스 기준 및 지침을 분석하여 총 9개의 품질요인을 도출하였으며, 이 요인을 활용하여 설문조사와 사례의 질적 평가가 이루어졌다. 조사 결과, 공공도서관 장애인서비스에서 가장 핵심적이며, 또한 상대적으로 취약한 품질요인은 시설, 장서, 직원 등 기본적인 도서관 자원의 영역으로 나타났다. 또한 도서관장애인서비스 우수사례를 분석한 결과 독서문화프로그램과 정보서비스 품질요인에 강조를 두고 있음이 조사되었다.