• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.436-440
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• 2009

자가 치유란 시스템에서 발생될 수 있는 에러나 오류를 미리 예상하거나 감지하고 시스템 스스로 치유함으로써 시스템의 오동작을 최소화하는 것을 의미한다. 자가 치유 시스템의 신뢰성을 높이기 위해서는 정확한 테스트 기법이 필요하다. 하지만 기존의 테스트 기법은 성공 또는 실패만으로 나타내기때문에 정량적인 평가가 불가능하다. 따라서 본 논문에서는 자가 치유 시스템이 달성해야 할 목표를 추출하고 관계에 따라 트리로 작성하여 이를 기반으로 시스템의 자가 치유 기법의 성공률을 정량적 측정하는 기법을 제안한다. 본 기법을 통해 자가 치유 시스템의 치유 결과를 정량적으로 평가 가능하고, 평가결과를 기반으로 치유 전략에 대한 문제점이 분석 가능하므로 자가 치유 시스템의 신뢰성 향상이 가능하다.

• 한국건설관리학회논문집
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• 제6권4호
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• pp.190-198
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• 2005

본 연구의 목적은 건설프로젝트에 관련된 기술문서(technical document)를 효율적으로 저장하고 웹(web)을 통하여 신속하고 정확하게 교환할 수 있도록 전자화(digitalization)하는 방안을 제시하는 것이다. 이를 위해 본 연구에서는 먼저 전자화 측면을 고려하여 기술문서의 여러 특성을 분석하였고 이를 바탕으로 저장에는 데이터베이스(database)를, 웹을 통한 교환에는 XML을 적용하여 기술문서를 전자화할 수 있는 방안을 도출하였다. 여기에는 기술문서의 저장과 검색, 부분적인 XML문서의 작성, 기술문서에 적합한 구성항목과 구성체계 설정, 웹에서의 수식과 그래픽 처리 방안이 포함된다. 마지막에는 전형적인 기술문서 중의 하나인 구조계산서(structural design sheets)를 대상으로 하여 데이터베이스에 저장하기 위한 자료구조(data structure) 정의, 실제 XML문서의 작성 및 웹을 통한 교환 등을 부분적으로 구현하여 본 연구에서 제안한 데이터베이스와XML에 기반한 기술문서 전자화 방안의 적정성을 검토하였다.

• 수산경영론집
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• 제47권1호
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• pp.63-86
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• 2016

The purpose of this study is to investigate production efficiency of Oceans and Fisheries Human Resources Development Programs Efficiency using Bootstrap-DEA. The study extracts 33 officials curriculum, 11 fisheries managers curriculum for its analytical. First, the study estimates technical, pure technical, and scale efficiency of each curriculums based on traditional DEA under the assumption of CRS and VRS. 8(official 7, managers 1) curriculums are identified as efficient DMUs under the CCR-model, and 13(official 10, managers 3) under the BCC-model. We provide inputs that allow inefficient curriculum to be efficient DMUs on a production frontier, and a reference set for their bench-marking. Second, rank test, Wilcoxon-Mann-Whitney test to find a statistical significance of heterogeneity existing in efficiences between Bootstrap-DEA tenical vs Bootstrap-DEA pure technical was no significant difference. We have identified that G10, 11, 12 13, 25, 31, 33, 39 curriculums are the most efficiently produced in the technical and pure technical efficiency. Also we managed to measure the inefficiency which exists in efficiently produced curriculums when estimating the bias corrected efficiency scores. In Technical efficiency, Operation and facility was significant at the 10%. In Pure technical efficiency, facility was significant at the 10%.

• 수산경영론집
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• 제41권3호
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• pp.21-44
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• 2010

The paper estimates changes in total factor productivity and technical efficiency change index and technical change index using Malmquist productivity index(MPI) in fisheries wholesale products over the time period of 2006 through 2008. The model considers a number of employees and operating costs as input factors, and sales and EBIT(earnings before tax and interest) as output factors. The results indicate that, between 2006 and 2007, there is in general technical progress in which TCI(Technical Change Index) indicates 2.7994 in the sale scale of 50 million won through 100 million won, while there are no efficiency in TECI(Technical Efficiency Change Index), PECI(Pure Efficiency Change Index) and SECI(Scale Efficiency Change Index) which are estimated to be around 1. Between 2007 and 2008 technical efficiency and technical progress are generally declined, compared to those of 2006 and 2007. Wilcoxon's rank-sum test shows that there are statistically significant difference of TCI and MPI between two periods at the level of 5%, while there are statistically significant difference of TECI, PECI and SECI between two periods at the level of 5%.

• 조명전기설비학회논문지
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• 제18권6호
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• pp.100-107
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• 2004

유희용전차는 유원시설 내에 설치된 놀이기구의 일종으로 산자부고시인 전기설비기술기준 제252조에서 별도로 규정하고 있다. 전기설비기술기준은 법적 최소요건으로 일본의 전기설비기술기준령을 토대로 제정된 이후 기술적 환경의 변화에 신속하게 대응하지 못함에 따라 유희용전차의 시설에 관한 규정에 있어서도 현실적인 문제점이 많이 내포되어 있다. 따라서, 본 논문에서는 이와 같은 현장 적용상의 기술적 문제점을 해결하기 위하여 전국에 있는 28개의 유희용전차를 대상으로 현장 적용실태 분석 및 실측을 통하여 현행 전기설비기술기준의 개선방안을 제시하였다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2009년도 춘계학술발표대회
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• pp.1326-1329
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• 2009

서비스 로봇이 발전함에 따라 인간이 직접 해결해야했던 작업들이 로봇에게 위임가능하게 되었으나, 서비스 로봇이 잘못된 행동을 하게 되는 경우 작업에 심각한 혼란이 야기되고, 사람의 안전과 직결될 수 있다. 이러한 문제점을 극복하기 위해 지능형 서비스 로봇을 위한 자가 치유 방법론 및 자가 치유시스템의 구조를 제안한다. 제안 방법론은 7단계로 설계 및 구현되며, 시스템 구조는 모니터링, 진단 및 평가, 치유전략 계획 및 실행 순으로 수행된다. 제안사항을 통해 로봇의 고장으로 인한 불편을 최소화 하며 관리를 위해 발생하는 비용 절감이 가능하다.

• 유통과학연구
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• 제22권1호
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• pp.37-46
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• 2024

Purpose: This study aims to address the overlooked micro-level aspects within Smart Manufacturing (SM) research, rectifying the misalignment in manufacturing firms' estimation of their technological adoption capabilities. Drawing upon the Social-Technical Systems (STS) theory, this paper utilises innovation capability as a mediating variable, constructing a human-centric organizational model to bridge this research gap. Research design, data and methodology: This study collected data from 233 Chinese manufacturing firms via online questionnaires. Introducing innovation capability as a mediating variable, it investigates the impact of social-technical system dimensions (work design, social subsystems, and technical subsystems) on SM adoption willingness. Smart PLS 4.0 was employed for data analysis, and Structural Equation Modelling (SEM) validated the theoretical model's assumptions. Results: In direct relationships, social subsystems, technical subsystems, and work design positively influence firms' innovation capabilities, which, in turn, positively impact SM adoption. However, innovation capability does not mediate the relationship between technical subsystems and SM adoption. Conclusions: This study focuses on the internal micro-level of organisational employees, constructing a human-centric framework that emphasises the interaction between organisations and technology. The study fills empirical gaps in Smart Manufacturing adoption, providing organisations with a means to examine the integration of employees and the organisational social-technical system.

• Nuclear Engineering and Technology
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• 제55권12호
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• pp.4465-4471
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• 2023

Hands-on education and training is a key part of fixing and developing technology knowledge and is an inherent part of many engineering and scientific curricula. However, access to large complex training facilities, such as nuclear reactor, could be limited by various factors, such as unavailability of those facilities in the region, high traveling costs or harmonization of the schedules of hands-on E&T with theoretical lectures and with the operational schedule of the facility. To handle the issue, several success stories have been reached with the introduction of the Internet Reactor Labs (IRL). The Internet Reactor Labs can strongly contribute to accessibility of training at research reactors and can contribute to improvements in their utilization. The paper describes the development of the Internet Reactor Lab at the VR-1 reactor of the Czech Technical University in Prague. Contrary to single-purpose IRLs, it presents various modalities of online teaching and training in experimental reactor physics and reactor operation in general as well as outreach activities that have been developed in recent years.

• 대한영상의학회지
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• 제85권3호
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• pp.596-606
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• 2024

Purpose To examine the technical considerations of endovascular treatment for aortoiliac occlusive disease (AIOD) based on a 10-year experience in Songklanagarind Hospital. Materials and Methods This retrospective cohort study included 210 patients who underwent endovascular treatment for symptomatic AIOD between January 2010 and December 2020. The patients' clinical and lesion characteristics, including technical considerations of the procedure, were collected, analyzed, and stratified using the Transatlantic Inter-Society Consensus (TASC). Results Most patients (80%) in this study had chronic limb-threatening ischemia lesions, with an occlusion rate of 37%. The technical success rate of TASC C & D was lower than that of TASC A & B, 84.4% vs. 99.2% p ≤ 0.001. A technical success rate of 93.3% (14/15) was found for the femoral and brachial approach, compared with a success rate of 89.0% (57/64) for the unibifemoral approach in TASC C & D, without a statistically significant difference (p = 0.076). However, the puncture site complications in this route were up to 17.6%, which is the highest rate compared with other techniques. These complications could be treated either conservatively or minimally invasively. Conclusion In cases of failed femoral access, simultaneous femoral and brachial approaches improved the technical success rate of endovascular recanalization of TASC C & D aortoiliac occlusions.

• Corrosion Science and Technology
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• 제23권4호
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• pp.289-295
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• 2024

Zn-Mg-Al alloy hot-dip galvanized steel sheet has high corrosion resistance. Compared to conventional Zn coating with the same coating thickness, the high corrosion resistance Zn-Mg-Al coating is more corrosion-resistant. Various coating compositions are commercially produced and applied in diverse fields. However, these steel sheets typically contain up to 3 wt% magnesium. In recent years, there has been a growing demand for higher corrosion resistance in harsh corrosive environments. Therefore, variations in Mg and Al contents were investigated while evaluating primary properties and performance. As a result, we developed new alloy-coated steel with ultra-high corrosion resistance. A Zn-5 wt%Mg-Al coated steel sheet was evaluated for its corrosion resistance and various properties. As the amount of Mg added increased, the corrosion loss tended to decrease. The corrosion resistance of the coated steel sheet in a particular composition, the Zn-5 wt%Mg-Al coating sheet, was about 1.5 to 2 times higher than that of the conventional Zn-3 wt%Mg-Al coating sheet. Ultimately, this ultra-high corrosion-resistance coated steel sheet will provide a robust solution to conserve Zn resources and contribute to a low-carbon society.