• Proceedings of the Korean Reliability Society Conference
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• 2000.11a
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• pp.287-296
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• 2000

원자력 발전소에 사용되는 전자부품들은 원자력 발전소의 안전성 문제로 인하여 다른 곳에 사용되는 전자부품들보다 더욱 높은 신뢰성이 요구된다. 원자력 발전소에서는 주로 안전성이 검증된 외국 제조업체의 전자부품들을 사용해 왔는데, 외국에서 원자력 산업이 퇴조하면서 제조업체들이 원전용 전자부품의 생산을 중단하거나 인건비가 싼 다른 나라에서 주문생산을 하게 되면서 국내 원자력 발전소에서는 이들 외국 제조업체에서 구매한 전자부품들이 짧은 기간 내에 고장을 일으키는 경우를 종종 경험하게 되었다. 이와 같은 상황 하에서 외국 제조업체에서 구매한 전자부품들을 현장에 사용하기 전에 초기에 고장을 일으킬 결함을 제거한 후 사용하기 위하여 번인시험을 실시하였다. 본 논문에서는 원전 제어봉 제어계통에서 사용하는 다이오우드에 대하여 번인시험을 수행한 사례를 제시하고, 경제적으로 번인시험을 수행할 수 있는 방법을 제시하였다.

• Korean Journal of Occupational Health Nursing
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• v.2
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• pp.13-25
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• 1992

본 연구는 업종별 산업간호사의 보건관리업무의 내용과 수행정도를 측정하고 업종별 보건관리업무 수행정도를 비교 분석코저 한다. 연구방법은 산업간호사회에 등록된 산업장중 서울, 인천, 마산, 창원, 부산, 울산 지역에 있는 130개 산업장을 임의로 선정하여 산업간호사를 대상으로 설문조사하였다. 자료분석은 반도와 백분율, 업종간의 보건관리업무 내용별 수행정도는 일원분산분석과 다중검증 비교로 유의성을 검증하였다. 연구결과는 다음과 같다. 1) 업종별로 산업간호사의 업무수행에 유의한 차이를 보인 보건관리내용은 서비스업에 있어서 근로자의 건강사정에 대한 수행정도가 제조업과 기타제조업에서 보다 높게 나타났다.(F=4.23, P=.0167) 반면에 근로자의 건강진단과 계속관리, 작업환경 관리업무 수행정도는 제조업과 기타제조업에서 서비스업보다 높게 나타났다.(F=9.78, P=.0001 ; F=5.366. P=.005) 2) 업종간에 유의한 차이가 없는 보건관리내용은 산업장진단 또는 건강문제분석, 보건교육, 통상증상에 대한 투약, 기록과 보고, 건강관리실 운영 등이었으며 업무수행정도는 가끔 또는 필요시하는 정도로 나타났다. 반면에 조사, 연구 참여에 대한 수행정도는 세 업종 모두 가장 낮은 것으로 나타났다. 이러한 연구결과들은 산업장 간호사의 신규교육이나 직무교육과정운영이 업종별로 운영되어야 함을 시사해 준다고 볼 수 있으며 또한 산업간호사의 직무 중 보건 교육, 통상질환에 대한 투약, 기록 및 보고, 건강관리실운영등은 업종간에 유의한 차이가 없으나, 수행정도는 낮은것으로 나타나 이에 대한 실제적인 직무교육이 강화되어야 할 것으로 생각된다. 특히 보건교육도 업종별로 차이가 있으므로 다양한 보건교육교재의 개발이 필요하다고 생각된다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.3
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• pp.274-280
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• 2016

Hinge driving type holding and release mechanism based on the burn wire release for application of cubesat is main payload of STEP Cube Lab. (Cube Laboratory for Space Technology Experimental Project) to be launched at 2015. It has high constraint force, low shock level as well as surmounting drawbacks of conventional nichrome burn wire release method that has relatively low constraint force and system complexity for application of multi-deployable systems. In this paper, we have proposed a flight model of holding and release mechanism for the verification of the constraint force and deployment status signal acquisition. To validate the effectiveness of the flight model, launch and on-orbit environment verification test have been performed.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.3
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• pp.165-176
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• 2011

In this paper, we examine the reliability verification procedure of evidence analysis tools for computer forensics and test the famous tools for their functional requirements using the verification items proposed by standard document, TIAK.KO-12.0112. Also, we carry out performance evaluation based on test results and suggest the way of performance improvement for evidence analysis tools. To achieve this, we first investigate functions that test subjects can perform, and then we set up a specific test plan and create evidence image files which contain the contents of a verification items. We finally verify and analyze the test results. In this process, we can discover some weaknesses of most of analysis tools, such as the restoration for deleted & fragmented files, the identification of the file format which is widely used in the country and the processing of the strings composed of Korean alphabet.

• Journal of the Korea Society for Simulation
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• v.19 no.1
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• pp.153-160
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• 2010

Most part of errors in software development process are included during the stage of requirements definition and design. And correction or elimination of errors from those stages requires much more efforts and costs than those from the later part of software development process. However, despite of the importance of the validation of requirement definition and design stages, several kinds of problem have made it hard to be done successfully. Therefore, in this paper, we introduce a novel validation process for the preliminary design stage. The validation process is based on simulations of model and it can be used to validate requirements and model simultaneously. Models in the validation process will take only the behavior of software and be built on Ptolemy framework. The usability of our validation process is confirmed with a case study over DNS system environment. And the result of simulation shows well-known errors or vulnerabilities can be found with simulations of model which has the behavior of software. This means our validation process can be used as a process to validate requirements and models during the early stage of software development process.

• Journal of Aerospace System Engineering
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• v.16 no.1
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• pp.81-85
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• 2022

In this study, we conducted a structural design and analysis of air intake of aircraft engine using composite materials. First, an investigation on structural design requirement of target structure was carried out. The distributed pressure load and acceleration condition was applied to structural design. To evaluate the structural design result, finite element analysis was carried out. The stress, deflection and buckling analysis for structural safety evaluation was performed. Finally, it was confirmed that the air intake through structural analysis is safety.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.93-93
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• 2021

아날로그 기법은 대표적인 일기도분류 기반의 공간상세화 기법으로써 과거 기상 현상이 미래 재현된다는 가정 하에 공간상세화를 수행하는 방법이다. 대규모 공간범위에 대한 아날로그 기법 적용 시에 지역 구분을 기반으로 적용하는 것이 바람직하다고 알려져 있으며, 기상 변수 간의 선형 상관성을 기반으로 지역구분을 수행하는 기법이 제안된 바 있다. 다만 기존 방법은 아날로그 시점을 찾는 범위가 지나치게 넓어지거나, 공간적으로 불연속적인 구간이 발생할 수 있다. 따라서 지역 간 기후변동성이 크고 도서가 다수 위치한 아시아 지역에서는 부적합한 방법이다. 본 연구에서는 아시아 지역에 대해 지역별 기후특성을 반영할 수 있는 아날로그 공간상세화 기법(BCIA)을 제안하고 평가하고자 한다. 본 연구에서는 쾨펜 기후구분과 ETCCDI 지수를 활용하여 기후특성을 고려한 지역구분을 수행하였으며, 이를 기반으로 아날로그 상세화를 수행하고 평가하였다. 평가결과 BCIA는 기존 아날로그 기법에 비해 기후 특성을 재현하는데 효과적인 것으로 나타났으며, 특히 극치 계열의 기후 지수, 강수일수와 관련된 기후 지수의 재현성이 우수한 것을 확인하였다. 본 연구에서는 기존 일부 지역에서만 시도되었던 지역별 아날로그 적용 방법론을 아시아 지역에 맞게 새롭게 제안하였고 이에 대한 활용성을 검증하였다는 점에서 가치가 있다.

• Journal of Digital Convergence
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• v.15 no.11
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• pp.557-565
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• 2017

This study was to examine the influence of instructor's attractiveness recognized by participants in community sports on instructing effectiveness and adherence. In this research, 228 participants who participate in community sports in Seoul and Gyeonggido were collected and the collected data was analyzed by using SPSS 18.0 version. The results are as follows. First, the attractiveness of instructors recognized by participants in community sports has influence on the instructing effectiveness. Second, the attractiveness of instructors recognized by participants in community sports affects the adherence of participants. Third, the instructing effectiveness has an effect on the adherence of participants in community sports.

• Journal of Advanced Navigation Technology
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• v.28 no.1
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• pp.95-101
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• 2024

This paper aims to establish a reconfigurable flight simulation environment to conduct safety evaluation of various electric vertical take-off and landing (eVTOL) aircraft. Since the inceptor, aircraft dynamics model, and controller applied to each eVTOL aircraft are different, it was configured to be variable so that a simulation can be executed for each eVTOL aircraft. Test elements and performance indicators were set to perform safety evaluation of eVTOL aircraft. Ground auxiliary equipments were designed and implemented in a simulation environment according to test procedures for each test element. In addition, to analyze safety performance, a simulation flight data collection environment based on MATLAB/Simulink and a tool for safety performance analysis were implemented. Test flight and analysis were conducted in the implemented simulation environment in this paper. Finally, this study shows the environment was verified by confirming that it was performed normally.

• Journal of the Korea Society of Computer and Information
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• v.16 no.11
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• pp.123-135
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• 2011

The domestic market of database in Korea is estimated to be over 3.663 trillion won. The data migration is getting to be more important along with the continuous growth of the database industry. g-CRM and private recommending function are examples of the service that can be given through coupling among customer database, product database, geographic information database, and others. The core infrastructure is also the database which is integrated, perfect, and reliable. There are not enough researches on efficient way of data migration and integrating process and investigation of migrated data though trends of database in IT environment as above. In connection with this issue, we have made a model for data migration on scientific and technological contents and suggest the result of data migration process adapting that model. In addition, we verified migration's exhaustiveness, migration's consistency, and migration's coherence for investigation of migrated data and database. From the result, we conclude data migration based on proper model has a significant influence on the database consistency and the data values correctness and is essential to maintain high qualified database.