• 대한조선학회논문집
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• 제55권1호
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• pp.9-21
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• 2018

Survivability of naval vessels is defined as the ability to perform functions and missions in a combat environment. Survivability has close relationship with the spatial layout of naval vessels. In order to maximize survivability, it must be considered from the early stage of design. However the existing concept of survivability was intended to be applied to unit vessels. So it was not suitable for assessment of spatial layout results at the early stage of design. In this paper, a simplified assessment method which can evaluate the spatial layout considering the survivability in the early stage of design has been proposed. For this, assessment layers were defined on survivability components such as susceptibility, vulnerability, and recoverability. Assessment layers of each component were overlapped to deduce a survivability layer of spatial layout alternatives. In addition, the proposed method and optimization algorithm were used to derive optimal spatial layout alternatives considering survivability.

• 한국농공학회논문집
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• 제53권2호
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• pp.9-17
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• 2011

Based on the statistical annual report, there are 17,649 reservoirs are operating for the purpose of agricultural water supply in Korea. 58 % of entire agricultural reservoirs had been constructed before 1948 which indicate the termination of required service life and rest of those reservoirs have also exposed to the dam break risk by extreme flood event caused by current ongoing climate change. To prevent damages from dam failure accident of these risky small size dams, it is necessary to evaluate and manage the structural and hydrological safety of the reservoirs. In this study, a simplified evaluation method for hydrologic safety of dam is suggested by using Rational and Creager formula. Hydrologic safety of small scale dams has evaluated by calculating flood discharge capacity of the spillway and compares the results with design frequency of each reservoir. Applicability and stability of suggested simplified method have examined and reviewd by comparing the results from rainfall-runoff modeling with dam break simulation using HEC-HMS. Application results of developed methodology for three sample reservoirs show that simplified assessment method tends to calculate greater inflow to the reservoirs then HEC-HMS model which lead lowered hydrologic safety of reservoirs. Based on the results of application, it is expected that the developed methodology can be adapted as useful tool for small scale reservoir's hydrologic safety evaluation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.310-312
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• 2002

The development of IEC 61400-21 provides firm basis for assessment of the impact of wind turbines on voltage quality. This paper presents analysis and modeling of the flicker emission of wind turbines. The paper concentrates on the theoretical aspects of the flicker algorithm, wind turbine characteristics and the generation of flicker during continuous operation of wind turbines. It also introduces a simplified assessment to limit the flicker emission.

• 해양환경안전학회지
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• 제21권3호
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• pp.297-302
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• 2015

To prevent cargo accidents by repeated loads, a continuous monitoring for securing rope or additional safety measures are needed, but most of prevention measures have been conducted only by operator's own experience not a quantitative assessment. Hence, the Load-Displacement curve and approximation formula of securing rope were drawn in this research for a quantitative assessment and simplified measurement on a tension of securing rope using a tensiometer. Moreover, a com parison was conducted between m easuring tension and calculated tension on securing rope with portable tensiometer, 'Load-Displacement' approximation formula. The calculated tension of securing rope is obtained 153.3kfg using the formula and that result has not much difference with initial tension 150.0kgf. Lastly, an analysis of the characteristics of various ropes was suggested to enhance the reliability about quantitative assessment of securing rope's tension through further research.

• 대한간호
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• 제19권5호통권108호
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• pp.50-53
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• 1980

A new patient classification system, SLC System was introduced. It has been implemented in the Friendship Village Extended Care Facility in St. Louis, Missouri, USA, and it has shown that the system not only simplified the job but also increased the job e

• Communications for Statistical Applications and Methods
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• 제3권3호
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• pp.125-133
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• 1996

In this paper, we present a algebraic technique for computing system reliability for complex system. The method was originally developed as an aid to fault tree analysis but it applies to general problems of reliability assessment. A success expression which directly gives the reliability expression is formed and simplified by the procedure. Several algorithms and examples are illustrated.

• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 2003년도 춘계학술대회 및 제1회 한일 공동 학술대회
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• pp.99-99
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• 2003

• 대한기계학회논문집A
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• 제38권10호
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• pp.1163-1169
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• 2014

본 연구에서는 자동차 서스펜션 구조에 일반적으로 사용되는 용접부 형상에 대하여 굽힘 하중에 의한 피로수명을 예측할 수 있는 절차를 개발하였다. 이종 재료로 이루어진 실제 제품 용접 연결부의 피로수명 예측을 위해, 복잡한 형상의 제품을 단순화한 용접 시편을 설계하고 이에 대한 굽힘 피로 시험을 진행한 후 모멘트-피로수명(M-N) 선도를 제시하였다. 응력 집중에 의한 영향을 분석하기 위해 시편의 형상을 모델링 한 후 정적 하중에 대한 유한요소해석을 수행하여 균열 발생부의 응력을 구하고 응력-피로수명(S-N) 선도를 제시하였다. 유한요소해석을 통해 구한 응력과 이론 계산을 통해 구해준 응력을 이용하여 응력집중계수를 계산하였고, 응력집중부의 피로평가 방법 개선을 위해 보편적으로 사용되는 피로노치계수 평가법과 굽힘 피로 시험 결과를 비교 검토하였다. 그 결과, 이종 재질 용접 연결부의 정확한 피로 수명평가를 위해서는 기하형상을 고려한 피로노치계수 평가 분석뿐만 아니라 두 소재의 맞대기 용접 시편에 대한 피로 시험을 수행해 주어야 할 것으로 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 봄 학술발표회 논문집
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• pp.233-240
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• 2003

A GIS-based tunnelling risk management system (GIS-TURIMS) has been developed in this study The developed system uses ArcView 8.2 as a basic platform and the built-in interface(VBA) has been used to perform first-order simplified analyses for prediction of tunnelling-induced ground movements and building damage assessment. The main emphasis in this study was to develop a working framework that can be used in the perspective of tunnelling risk management. The developed system is capable of carrying out computationally intensive first-order analyses for ground movement prediction as well as building/utilities damage assessment with fully taking advantage of the GIS technologies. This paper describes the concept and details of the GIS-TURIMS development and implementation.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.311-318
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• 2002

A GIS-based tunnelling risk management system (GIS-TURIMS) has been developed in this study, The developed system uses ArcView 8.2 as a basic platform and the built-in interface (VBA) has been used to perform first-order simplified analyses for prediction of tunnelling-induced ground movements and building damage assessment. The main emphasis in this study was to develop a working framework that can be used in the perspective of tunnelling risk management. The developed system is capable of carrying out computationally intensive analyses for ground movement prediction as well as building/utilities damage assessment with fully taking advantage of the GIS technologies. This paper describes the concept and details of the GIS-TURIMS development and implementation