• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.396-396
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• 2004

최근 국가 에너지 정책은 다양한 발전원들의 대중보건, 환경성, 경제성, 사회기여도 등을 고려하여 결정되고 있다. 이는 원자력을 포함한 여러 발전원들에 대한 종합 위험도 평가 체계에 기반을 두어 구체화된다. 세계적으로는 화석연료-의존 에너지 정책에서 벗어나 좀 더 지속가능 에너지 개발에 관심이 집중되고 있다. 이 연구의 목적은 국내 주요 발전원별 환경성 데이터베이스를 구축하고 LCA 방법론을 사용하여 발전원별로 건설, 운영(연료주기), 폐기단계 등 전반에 걸쳐서 전과정 환경영향을 평가하여 발전원의 환경적 영향부하를 비교하려는 것이다.(중략)

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.10
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• pp.1291-1296
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• 2013

Risk-based inspection (RBI) is a well-known method that is used to optimize inspection activities based on risk analysis in order to identify the high-risk components of major facilities such as power plants. RBI, when implemented and maintained properly, improves plant reliability and safety while reducing unplanned outages and repair costs. Risk is given by the product of the probability of failure (POF) and the consequence of failure (COF). A semi-quantitative method is generally used for risk assessment. Semi-quantitative risk assessment complements the low accuracy of qualitative risk assessment and the high expense and long calculation time of quantitative risk assessment. The first step of RBI is to identify important failure modes and causes in the equipment. Once these are defined, the POF and COF can be assessed for each failure. During POF and COF assessment, an effective inspection method and range can be easily found. In this paper, the calculation of the POF is improved for accurate risk assessment. A modified semi-quantitative risk assessment was carried out for boiler facilities of thermal power plants, and the next maintenance schedules for the equipment were decided.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.671-674
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• 2003

최근 정보보호에 대한 관심이 높아짐에 따라 그에 따른 기반 기술들이 요구되고 있다. 특히, 통신 인프라에 집중되었던 정보보호 산업이 이를 기반한 제품으로 관심이 부각되고 있다. 이러한 정보보호제품의 신뢰성은 매우 중요한 요소이며, 신뢰성 보장을 위한 보안 기능의 보증은 중요하다. 본 논문에서는 개발 단계에서 유지보수 단계에 이르는 생명주기 찰동의 보증과 품질보증 위한 방법 또한 중요하다는 것을 인식하고 이를 위해 소프트웨어 개발에 정보보호시스템 공동평가기준(정보통신부 고시 제2002-40호, 이하 공통평가기준)을 적용하여 개발할 수 있도록 프로세스를 제시한다 이를 통해 소프트웨어 개발자나 시스템 관리자들이 정보보호 인증을 보장하며, 안전한 소프트웨어를 개발하여 효율적으로 관리할 수 있도록 소프트웨어 개랄 및 변경시 발생할 수 있는 위험들과 이에 대한 통제들을 제안한다 향후 전산망 시스템에서 사용되는 정보보호 제품의 개발 및 관리에 도움 줄 것을 기대한다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.493-495
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• 2004

본 연구에서는 정보시스템의 상호운용성을 측정하기 위한 질의서를 설계하고 개발하였다. 상호운용 질의서는 상호운용 성숙도를 측정하는 평가모델인 LISI의 구성요소이다 LISI 기반의 상호운용성을 측정하기 위하여 필요한 정보들을 상호운용 질의서를 통하여 획득한 후 분석하여 상호운용 성숙도를 측정하게 된다. 정확한 상호운용성을 평가하기 위해서는 평가대상 체계의 상호운용 능력에 대한 정보를 정확하게 추출할 수 있는 질의서의 개발이 매우 중요하다 본 연구에서는 변형된 V-모델의 시스템 개발 생명주기에 따르는 상호운용성 평가 질의서의 개발 방안을 제시하고 평가 가능한 질의서를 개발하였다.

• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.358-361
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• 2001

인터넷의 발전으로 우리는 빠른 시간에 많은 정보를 접할 수 있을 뿐 아니라 웹을 이용한 동적인 개인 신상관리와 교육에서 교사와 학생간에 웹을 이용한 새로운 인터페이스를 열 수 있게 되었다. 형성평가는 교사가 기계적으로 채점하고, 틀렸을 때 이를 교정해 주기보다는 스스로 학습결과의 정답을 확인하고 틀렸을 때 이에 대한 정답을 학생 자신이 찾아내도록 함으로써 형성평가의 과정 그 자체가 학습과정의 일부가 되도록 하여야 한다. 본 연구에서는 멀티미디어저작도구로 형성평가 문항을 만들어, 교사와 학생 모두 빠르고 정확하게 채점하여 즉시 결과를 확인하고 feedback 효과를 얻고자 데이터베이스 연동을 이용한 웹 기반 형성평가 방안을 제안한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.2
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• pp.363-374
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• 2015

Instrumentation and control(I&C) system has been mainly designed and operated based on analog technologies in existing Nuclear Power Plants(NPPs). However, As the development of Information Technology(IT), digital technologies are gradually being adopted in newly built NPPs. I&C System based on digital technologies has many advantages but it is vulnerable to cyber threat. For this reason, cyber threat adversely affects on safety and reliability of I&C system as well as the entire NPPs. Therefore, the software equipped to NPPs should be developed with cyber security attributes from the initiation phase of software development life cycle. Moreover through cyber security assessment, the degree of confidence concerning cyber security should be measured and if managerial, technical and operational work measures are implemented as intended should be reviewed in order to protect the I&C systems and information. Currently the overall cyber security program, including cyber security assessment, is not established on I&C systems. In this paper, we propose cyber security assessment methods in the Software Development Life Cycle by drawing cyber security activities and assessment items based on regulatory guides and standard technologies concerned with NPPs.

• Journal of The Korean Association of Information Education
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• v.11 no.4
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• pp.483-495
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• 2007

In this paper, to establish a way controlling educational contents, range of contents for quality control are offered. And a life-cycle suitable for present circumstance has defined and successive quality control process has suggested supporting development and use of the contents through analyzing the life cycle of its software and previous contents. A life cycle is defined as whole process from formation of contents to its extinction. The developing process includes stages of planning, designing, manufacturing, and the applying process includes evaluation, circulation and management. Suitable quality control guidelines for each process have established and offered. Aim of this paper is also to develop a model which is applicable to developers as well as supporters who help the developing process.

• Journal of the Korean Society for information Management
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• v.40 no.4
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• pp.1-31
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• 2023

This study conducted user experience evaluation by introducing various text mining techniques along with topic modeling techniques for mobile menstrual cycle measurement applications that are closely related to women's health and analyzed the results by combining them with a honeycomb model. To evaluate the user experience revealed in the menstrual cycle measurement application review, 47,117 Korean reviews of the menstrual cycle measurement application were collected. Topic modeling analysis was conducted to confirm the overall discourse on the user experience revealed in the review, and text network analysis was conducted to confirm the specific experience of each topic. In addition, sentimental analysis was conducted to understand the emotional experience of users. Based on this, the development strategy of the menstrual cycle measurement application was presented in terms of accuracy, design, monitoring, data management, and user management. As a result of the study, it was confirmed that the accuracy and monitoring function of the menstrual cycle measurement of the application should be improved, and it was observed that various design attempts were required. In addition, the necessity of supplementing personal information and the user's biometric data management method was also confirmed. By exploring the user experience (UX) of the menstrual cycle measurement application in-depth, this study revealed various factors experienced by users and suggested practical improvements to provide a better experience. It is also significant in that it presents a methodology by combines topic modeling and text network analysis techniques so that researchers can closely grasp vast amounts of review data in the process of evaluating user experiences.

• Journal of the Korean Society for Railway
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• v.11 no.1
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• pp.107-113
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• 2008

As it recently appears that LCC (Life Cycle Cost) analysis may be considered as an essential method for economic evaluation of infrastructures. Many researches have been made to assess LCC of each facility based on reasonable methods. However, expected maintenance repair cost must be reasonably estimated to enhance the reliability of LCC analysis through systematic and rational methods. This study is intended to propose a rational approach to reliability-based LCC analysis of high-speed railway steel bridges considering lifetime corrosion and fatigue damage. However in Korea, since high speed railway steel bridges are only recently constructed, no direct statistical data are available for the account of the maintenance cost and thus their maintenance characteristics are not clear yet. In this paper, for the assessment of expected maintenance/repair cost, the fatigue system reliability analysis incorporating the corrosion effect is proposed by considering the corrosion and fatigue damage using measured data of high speed railway steel bridges. A model proposed by Rahgozar, of at for fatigue notch factor considering the corrosion effect is used in order to incorporate the corrosion effect into the fatigue strength reduction and S-N curve. Finally, the effectiveness of LCC model proposed for high-speed railway steel bridges is demonstrated by a numerical example.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.13 no.2
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• pp.1-18
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• 2017

Metal fatigue is an important aging mechanism that material characteristics can be deteriorated when even a small load is applied repeatedly. An accurate fatigue evaluation is very important for component structural integrity and reliability. In the design stage of a nuclear power plant, the fatigue evaluations of the Class 1 components have to be performed. However, operating experience shows that the design evaluation can be very conservative due to conservatism in the transient severity and number of occurrence. Therefore, the fatigue monitoring system has been considered as a practical mean to ensure safe operation of the nuclear power plants. The fatigue monitoring system can quantify accumulated fatigue damage up to date for various plant conditions. The purpose of this paper is to describe the fatigue monitoring procedure and to introduce the fatigue monitoring program developed by the authors. The feasibility of the fatigue monitoring program is demonstrated by comparing with the actual operating data and finite element analysis results.