• 한국수자원학회논문집
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• 제48권8호
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• pp.647-657
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• 2015

본 연구는 국내 12개수계인 한강, 안성천, 금강, 삽교천, 영산강, 섬진강, 탐진강, 만경강, 동진강, 낙동강, 태화강, 형산강 유역에 대한 물이용 취약성 평가를 실시하였다. SWAT(Soil and Water Assessment Tool) 모형을 이용하여 국내 12개 수계의 연유출량을 도출하였고, 각 유역별 면적 및 인구당 유출량을 비교하였다. 취약성 평가를 위해 18개 지표로 구성하였고, 물이용의 수요, 손실 및 공급의 측면으로 구분하였다. 이때의 가중치는 객관적 가중치의 적용을 위해 엔트로피(Entropy)방법을 사용하였고 정량적인 물이용 취약성 평가를 위해 다기준 의사결정기법 중 하나인 TOPSIS(Technique for Order of Preference by Similarity to Ideal Solution) 기법을 적용하였다. 그 결과, 형산강의 물이용이 가장 취약하였고, 삽교천, 동진강, 섬진강, 안성천, 만경강, 낙동강, 탐진강, 영산강, 금강, 태화강, 한강 순이었다. 본 연구 결과는 향후 기후변화 취약성 평가를 위한 지표 개발에 이용할 수 있겠다.

• 디지털융복합연구
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• 제11권3호
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• pp.243-253
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• 2013

극심해지는 경쟁 환경 속에서 경쟁우위 확보를 위하여 SCM을 도입하는 기업들이 증가하고 있다. 공급망 프로세스의 복잡성과 SCM 도입에 투입되는 막대한 기업 자원을 감안할 때 성공적인 SCM 구축을 위해서는 자사의 공급망 수준에 대한 정확한 진단을 통해 취약점 및 개선점을 파악하는 것이 필수적이라 할 수 있다. 본 논문에서는 SCM 성과 측정지표에 관한 선행 연구를 살펴보고 대표적인 ETO 산업인 조선업을 대상으로 업종의 특성에 맞는 공급망 수준진단 프레임워크를 제안한다. 특히 가트너에서 제안한 공급망의 주요 3개 프로세스인 수요, 공급, 제품 관리를 기준으로 조선소의 공급망 프로세스를 세부 프로세스로 분해하고, 분해된 각 프로세스 별로 공급망 수준을 진단할 수 있는 측정지표를 제안한다. 또한 사례 연구를 통하여 제안된 공급망 수준진단 프레임워크를 실제 조선소의 공급망에 적용해 보고, 현실적 의미를 도출해 본다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제32권9호
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• pp.853-867
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• 2005

지금까지 많은 내용 기반 이미지 검색 방법들이 제안되고 있다. 이 시스템들은 각 시스템마다 다른 이미지 데이타를 이용하고, 다른 특징 추출방법에 따라 다른 특징 추출 데이타를 생성하므로, 각 시스템의 검색 성능을 비교 평가할 수가 없다 특히 웹상에서, 동일한 이미지 데이타를 서로 다른 사이트에 있는 내용 기반 이미지 검색 시스템에 적용하여 검색 성능을 비교 평가할 수 없는 문제점이 있다. 이와 같은 문제점을 해결하기 위해서, 각각의 특정한 검색시스템에서 생성된 특징 추출 데이타를 웹상의 다른 검색 시스템에서 인식할 수 있도록, XML 기반의 FEMAL을 제안한다. FEMAL을 이용한 실험에서, 특징 추출 데이타를 서로 통신하고 통합이 가능함을 보이고, 검색 성능의 비교 평가가 가능함을 보인다.

• Journal of the Optical Society of Korea
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• 제16권4호
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• pp.372-380
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• 2012

The optical method Digital Speckle Correlation Measurement (DSCM) has been extensively applied due its capability to measure the entire displacement field over a body surface. A formula of displacement measurement errors by the gradient-based DSCM method was derived. The errors were found to explicitly relate to the image grayscale errors consisting of sub-pixel interpolation algorithm errors, image noise, and subset deformation mismatch at each point of the subset. A power-law dependence of the standard deviation of displacement measurement errors on the subset size was established when the subset deformation was rigid body translation and random image noise was dominant and it was confirmed by both the numerical and experimental results. In a gradient-based algorithm the basic assumption is rigid body translation of the interrogated subsets, however, this is in contradiction to the real circumstances where strains exist. Numerical and experimental results also indicated that, subset shape function mismatch was dominant when the order of the assumed subset shape function was lower than that of the actual subset deformation field and the power-law dependence clearly broke down. The power-law relationship further leads to a simple criterion for choosing a suitable subset size, image quality, sub-pixel algorithm, and subset shape function for DSCM.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 춘계학술대회 논문집
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• pp.210-213
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• 2007

In this study accelerated aging test cycle and equipment was developed for aging test of polymer housed surge arresters under domestic weather condition In order to investigate aging characteristics of polymer surge arresters electrical and chemical analysis of the arresters which are used for accelerated aging test and outdoor exposure test were conducted. Through the analysis the capability of the proposed method was verified and characteristics data were presented for maintenance of domestic arresters. Based on these results long term reliability assessment method was proposed for polymer housed distribution surge arresters.

• 한국신뢰성학회지:신뢰성응용연구
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• 제10권1호
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• pp.73-91
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• 2010

All activities relate to railway traffic involve risk and that these arise from a combination of the nature of operating activities. Proper management system is required to provide the organizational capability to reveal, analyse and address these weaknesses over time and in reasonably practicable ways, which will determine the rate at which risks can be further reduced. This paper presents a systematic risk analysis approach to safety planning and decision making, informed by a range of risk assessment techniques. An railway organization's safety management system is also presented that shows the approaches taken to minimize the external risks, and identify the shared risks and explain how they will be controlled through collaboration with others.

• 마이크로전자및패키징학회지
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• 제22권2호
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• pp.1-4
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• 2015

Qualification includes all activities to demonstrate that a product meets and exceeds the reliability goals. Manufacturers need to spend time and resources for the qualification processes under the pressure of reducing time to market, as well as offering a competitive price. Failure to qualify a product could result in economic loss such as warranty and recall claims and the manufacturer could lose the reputation in the market. In order to provide valid and reliable qualification results, manufacturers are required to make extra effort based on the operational and environmental characteristics of the product. This paper discusses optimal interval censoring design for reliability prediction of electronic packages under limited time and resources. This design should provide more accurate assessment of package capability and thus deliver better reliability prediction.

• 산업경영시스템학회지
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• 제15권26호
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• pp.125-136
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• 1992

Primary prevention of low back injury in industry has focused on assessing the person's ability to perform physical labor. If the job to be performed is known to require lifting and moving of materials which could stress the low back, then special consideration is given to the health and functional capability of the person, s back. The major pursuit in lifting task of research is to provide objective criteria based upon all of the relevant mechanical parameters which describe both man art task so as to minimize the probabilities of injury within the economic constraints of each organization. The purpose of this study is to predict the back compression of persons asked to lift objects while assuming different position by computer simulation. The primary result of this study is that the incidence of low back injury is correlated with higher lifting strenth requirements as determined by assessment of both the location and magnitude of the load lifted. It is, therefore, recommended that load lifting be considered potentially hazardous, and the action limit and the maximum permissiable limit be used to guide corrective action.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.636-640
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• 2002

In contrast to conventional CNC, PC-NC opens a new era for machine tools to be more intelligent. For instance, machine tool with PC-NC can be a machine agent system with capability of reacting autonomously to changing operating conditions. This paper introduces a concept of intelligent machine agent system, composed of machine agent and cell manager. Machine agent performs the functions such as process monitoring, diagnosis, maintenance management, condition assessment and schedule negotiation, while cell manager coordinates the negotiation process among multiple machine agents.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 춘계학술발표회논문집(1)
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• pp.635-640
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• 1998

Thermal fluid mixing behavior during a postulated medium-size hot leg break loss of coolant accident is analyzed for the international comparative assessment study on pressurized thermal shock (PTS-ICAS) proposed by OECD-NEA. The applicability of RELAP5 code to analyze thermal fluid mixing behavior is evaluated through a simple modeling relevant to the problem constraints. Based on the calculation result, the onset of Thermal stratification is investigated using Theofanous's empirical correlation. Sensitivity calculations using a fine node model and crossflow model are also performed to evaluate the modeling capability on multi-dimensional characteristics related to thermal fluid mixing.