• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.189-192
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• 2005

In this paper, we present a Petri Net (PN) model for reliability analysis of a shared database system. The system consists of components; a database, two processors, two memory and a bus. The database should be operational and at least one of the component should be also operational. Otherwise system will be down. Each component can be failed and repaired individually. Stochastic Reward Net (SRN) Model for reliability analysis is developed. SRN is potential to define various reward function and can be easily used to obtain performance measures. The modeling techniques using variable cardinality, enabling function, timed transition priority in SRN are shown.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.856-861
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• 1998

본 논문은 원자력 발전소 안전계통/기기의 신뢰도를 평가하는데 있어서 필요한 데이터들을 관리하는 프로그램인 RAM-PRO의 계발에 관하여 기술하였다. RAM-PRO는 크게 두 가지의 프로그램으로 구성하였는데, 먼저 발전과장일지를 전산화하여 안전계통/기기와 관련된 시험, 운전이력을 데이터베이스에 저장하는 프로그램인 RAM-NOTE와 그 데이터로부터 신뢰도를 자동으로 계산하여주는 신뢰도 감시 프로그램인 RAM-REL으로 구현하였다. 이의 구현으로 인하여 실제로 월성 원자력 발전소 1호기의 예비/비상디젤발전기의 실제 데이터를 RAM-NOTE를 이용하여 입력하여 보았으며, 그 입력된 데이터베이스로부터 RAM-REL을 이용하여 신뢰도를 계산하여 보았다. 현재는 원자력 발전소의 모든 안전계통/기기에 적용 할 수 있도록 확장중에 있다.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.315-319
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• 2005

In this paper, we present a Petri Net (PN) model for reliability analysis of fault-tolerant database system models that consists of components one shared memory, bus, processors and database (disk). Each component can be failed and repaired individually. The system is operational as long as database and one of component is operational. We develop Stochastic Reward Net (SRN) Model for reliability analysis of database system. SRN is potential to define various reward functions. and can be easily used to obtain performance measures. The modeling techniques using variable cardinality, enabling function, timed transition priority in SRN are shown.

• Plant Journal
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• v.12 no.2
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• pp.31-35
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• 2016

A method of failure data management for Reliability-Centered Maintenance was shown for a boiler feedwater pump of a power plant. The major part of it is an analysis of failure mode, failure cause, and failure effects, which is the main component of a failure data base like OREDA(Offshore Reliability Data). Case study shows main element of the preventive maintenance planning such as the maintenance period can be statistically determined from the failure data.

• Journal of the Korean Institute of Gas
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• v.10 no.1 s.30
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• pp.13-18
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• 2006

Chemical plants should perform Quantitative Risk Assessment that evaluates types of accident, frequency and damage which can happen through using the hazardous equipment and the hazardous materials for preventing and preparing industrial disasters. It is necessary that Chemical plants should include the reliability database which efficiently evaluate the Quantitative Risk Assessment. So in this study, we suggest a which methodology applies Quantitative Risk Assessment on the basis of the constructed data to imply the reliability of industrial facilities and equipment, collection of reliability data, system analysis and development of software.

• Digital Contents
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• no.11 s.54
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• pp.53-55
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• 1997

일본에서 데이터베이스 서비스는 산업분류 중 '정보서비스 산업'의 한 분야로 구분되어 있다. 산업레벨을 신뢰할 수 있는 자료로서, 통상산업성의 지정통계인 '특정서비스산업 실태조사'가 있으며, 시장규모 등의 기초적인 항목에 관한 조사가 매년 실시되고 있다. 여기에서는 상기자료의 1996년도판 보고서와 같은 통상산업성의 '1995년도 데이터베이스 대장총람' 등을 기초로 일본 데이터베이스 서비스 시장에 대하여 소개하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.377-379
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• 1998

본 논문에서는 서지데이터베이스 품질향상을 위해 사용자의 요구사항을 기초로 하여 논문형태의 데이터베이스 특성을 파악한 후 표준입력 필드에 해당하는 기준을 정하고 데이터베이스 구축에 적용하는 입력시스템 모델을 구현하고자 한다. 데이터베이스 제작자들의 오류를 최소화하여 정보사용자의 만족도를 충족하기 위한 데이터베이스 구축 방법을 제시하였다. 서지데이터 입력을 위한 표준화된 입력방법을 통해 기존의 편집기를 활용한 텍스트 형태의 데이터베이스 제작시 문제점들을 개선하였으며 사용자 만족도, 데이터 양, 품질향상을 웹을 통한 입력시스템으로 구현하여 서지데이터베이스에 대한 신뢰도를 크게 향상시킬 수 있었다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.15 no.1
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• pp.117-129
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• 1997

In recent years, the 1 : 5,000 scale Digital National Basemap(DNB) has been generated under National Geo-graphic Information System(NGIS) Project. The DNB database generated will be the backdrop data for thematic maps, underground facilities maps and so on. The DNB database will be distributed to the government and private sectors in near future so that it should meet the requirements as the basic data. In order to assure the quality of DNB database, the establishment of quality assurance process to database was in great need. In this study, we were mainly concerned with improving the quality of digital national basemap database in geomatric aspect as well as the processing time due to the amount of digital data generated. As a results of this study, the quality assuance process of DNB database is established and automatic quality assurance program is developed. Also, the program developed in this study is contributed to quality assurance of DNB database as well as economic aspects.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1541-1544
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• 2003

In this study, embodying reliability block diagram based on the web and reliability analysis technology are developed. RBD(reliability Block Diagram) represents the functional relation between elements in any product. Among relations between elements. there are serial, parallel, bridge, and stand by, etc. Advantages of developed system are integrated datum about reliability (NPRD, EPRD, MIL-HDBK 217F, NSWC. OREDA. Bellcore, and domestic institutes & companies datum). graphic user interface for convenience, and the various service analyzes the failure history data of parts.

• Proceedings of the Korean Nuclear Society Conference
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• 2001.05a
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• pp.245.1-245
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• 2001