• Korean Chemical Engineering Research
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• v.60 no.3
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• pp.347-355
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• 2022

The safety valve (PSV) is a safety device that automatically releases a spring when the pressure generated by various causes reaches the set pressure, and is restored to a normal state when the pressure falls below a certain level. Periodic inspection and monitoring of safety valves are essential so that they can operate normally in abnormal conditions such as pressure rise. However, as the current safety inspection is performed only at a set period, it is difficult to ensure the safety of normal operation. Therefore, evaluation items were developed by finding failure modes and causative factors of safety valves required for safety management. In addition, it is intended to provide decision-making information for securing safety by deriving the priority of items. To this end, a Delphi survey was conducted three times to derive evaluation factors that were judged to be important in relation to the Failure Mode Cause Factor (FMCFs) of the safety valve (PSV) targeting 15 experts. As a result, 6 failure modes of the safety valve and 22 evaluation factors of its sub-factors were selected. In order to analyze the priorities of the evaluation factors selected in this way, the hierarchical structure was schematized, and the hierarchical decision-making method (AHP) was applied to the priority calculation. As a result of the analysis, the failure mode priorities of FMCFs were 'Leakage' (0.226), 'Fail to open' (0.201), 'Fail to relieve req'd capacity' (0.152), 'Open above set pressure' (0.149), 'Spuriously' 'open' (0.146) and 'Stuck open' (0.127) were confirmed in the order. The lower priority of FMCFs is 'PSV component rupture' (0.109), 'Fail to PSV size calculation' (0.068), 'PSV Spring aging' (0.065), 'Erratic opening' (0.059), 'Damage caused by improper installation and handling' (0.058), 'Fail to spring' (0.053), etc. were checked in the order. It is expected that through efficient management of FMCFs that have been prioritized, it will be possible to identify vulnerabilities of safety valves and contribute to improving safety.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.4
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• pp.47-55
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• 2009

This paper estimates interruption cost assessment for industrial load. For executing In this way first, we research customer interruption cost(CIC) for industrial load about 1,026 unit. And to assess industrial load in D/L calculate sector customer damage function(SCDF) using CIC. Second, we compute distribution reliability through annual failure rate, repair time and so on, and then, Third, distribution system that calculate VBDRA for industrial load per alternative assesses interruption cost.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.6D
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• pp.561-567
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• 2010

Recently, several number of Multi-Intermodal Transfer Center are nominated to improve convenience of public transportation user. Due to budget constraints, it should be defined which is the first consideration among the discussed many works. In this circumstance, there are some absurdities in the evaluation of validity of existing methods. Therefore, we suggested the Priority Order Valuation for Multi-Intermodal Transfer Centerer. The evaluation method, we suggested, is considered quantitative analysis and qualitative analysis. In this study, we find out that B/C ratio and construction costs are strongly related to the quantitative analysis so that Multi-Intermodal Transfer Centers in metropolitan area are evaluated the positive results. Therefore, both quantitative analysis and qualitative analysis are applied to the Priority Order, metropolitan area and other area are fairly evaluated the results for the Priority Order.

• Journal of the Korean Institute of Landscape Architecture
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• v.48 no.2
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• pp.34-44
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• 2020

The purpose of this study was to investigate the difference in perceptions between gardens and park functions as recognized by two groups, Group A and Group B, in order to confirm the distinction between concepts and functions and then establish the importance of individual functions. The AHP was used to analyze the importance of each group's perceptions by dividing them into garden and park, Group A and non-Group A, respectively. In Group A, the importance of garden functions were considered in descending order of importance to be cultural function, ecological function, and social function. In the general group, ecological function, cultural function, and social function also appeared, but in a different order of importance. As for the park functions, Group A recognized the importance of functions in a similar order of importance to the gardens: cultural function, ecological function, and social function. Group B thought that social function, ecological function, and cultural function have the same significance. At the major classification level, Group A and Group B emphasized the social function of the parks. Group A recognized the importance of the garden's cultural function as the most important, whereas the general group emphasized the importance of the garden's ecological function. As for the mid-class level, Group A recognized the aesthetic beauty, health, ecological environment protection, and water circulation as important functions of the garden. For Group B, the ecological environment protection, aesthetic beauty, water cycle, and health were important. The concepts and functions of gardens and parks are still largely mixed but are gradually becoming differentiated. As a follow-up study, it is important to systematically manage the functions of gardens by establishing design, construction, and monitoring DB techniques for the garden type and examine the hierarchy of various other gardens.

• Journal of Environmental Policy
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• v.13 no.1
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• pp.69-93
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• 2014

The aim of this research was to develop a climate change vulnerability index at the district level (Si, Gun, Gu) with respect to the health care sector in Korea. The climate change vulnerability index was esimated based on the four major causes of climate-related illnesses : vector, flood, heat waves, and air pollution/allergies. The vulnerability assessment framework consists of six layers, all of which are based on the IPCC vulnerability concepts (exposure, sensitivity, and adaptive capacity) and the pathway of direct and indirect impacts of climate change modulators on health. We collected proxy variables based on the conceptual framework of climate change vulnerability. Data were standardized using the min-max normalization method. We applied the analytic hierarchy process (AHP) weight and aggregated the variables using the non-compensatory multi-criteria approach. To verify the index, sensitivity analysis was conducted by using another aggregation method (geometric transformation method, which was applied to the index of multiple deprivation in the UK) and weight, calculated by the Budget Allocation method. The results showed that it would be possible to identify the vulnerable areas by applying the developed climate change vulnerability assessment index. The climate change vulnerability index could then be used as a valuable tool in setting climate change adaptation policies in the health care sector.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.208.2-208.2
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• 2010

폐기물 가스화는 생산된 합성가스를 이용하여 발전 등 직접적인 에너지원으로 이용할 수 있으며, 고부가가치 화합물의 원료 공급원으로도 이용할 수 있다. 폐기물 가스화를 이용한 고부가가치 화합물 제조의 경우 기존 화합물 제조공정에 폐기물 가스화 공정이 연계되어, 하나의 복합시스템으로 운영이 된다. 따라서 기존 공정과 최적으로 연계될 수 있는 폐기물 가스화 시스템의 개발 또는 선정이 필요하며, 이를 위하여 폐기물 가스화 시스템에 대한 분석 평가가 적절하게 이루어져야 한다. 본 연구에서는 시스템공학 개념을 적용하여 폐기물 가스화 시스템의 체계적인 분석 평가를 위한 프레임워크를 개발하였다. 시스템공학은 요건분석, 기능분석, 합성(통합), 분석/관리 프로세스를 통하여 시스템을 성공적으로 구현하기 위한 다학제적인 접근방법이다. 이러한 시스템공학의 개념 및 기본 프로세스를 적용 조정하여 폐기물 가스화 분석 평가 프레임워크를 개발하였으며, 개발된 프레임워크는 계층구조로 표현이 된다. 계층구조는 분석관점, 분석항목, 분석지표로 구성이 되며 분석된 데이터에 대한 평가는 AHP를 통하여 계산된 가중치를 적용하여 이루어진다.

• New & Renewable Energy
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• v.7 no.3
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• pp.83-91
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• 2011

The purpose of this study is to select appropriate location factors for wind power plant, provide detailed classification criteria, and find out appropriate sites for installing wind power plant in Gangwondo. In this study, the following 11 factors were extracted for site selection of wind power plant : wind resource, topography (valley angle, distance to the ridge), forest density, land use, preservation area, national park, Baekdu-Daegan, noise, shade, Transmission Line, and approaching roads. Each factor had relatively different level of importance so that AHP (Analytic Hierarchy Process) technique was used to calculated the weighted value per factor. For overlay analysis, classification criteria were prepared for each factor and each factor was classified into 3 grades : very appropriate, intermediate, poor. According to overlay analysis, the areas which received the highest grade (grade 5) was only in 0.16% of the total area of Gangwondo and had a tendency to exist along the mountain ridge over 600-meter elevation. Through analyzing the yearly average of wind power density, it was proved that the wind power density of areas with grade 4 or 5 had abundant wind resource over $400W/m^2$.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2004.05a
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• pp.215-219
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• 2004

본 연구에서는 다기관 통합전산센터의 다양한 운영모형 분석을 통한 효과적인 운영 대안을 수립하고, 최적 운영대안의 상시운영체계(BCP) 구성방향을 제시한다. 또한 현행 다기관 통합전산센터의 리스크 분석과 리스크 관리 특성을 모형화하여 다기관 통합전산센터의 상시운영계획 이행 절차의 자동화 시스템 구축 방안을 제시한다. 이를 위해 본 연구는 4가지 사항을 중점적으로 다루었다. 첫째, 통합전산센터와 관련한 다양한 용어에 대해 정리를 하고, 통합전산센터의 국내외 사례를 살펴봄으로써 통합전산센터의 중요요소를 도출하였다. 둘째, 다기관 통합전산센터의 논리적 운영모형을 분류하여 각 모형에 따른 장${\cdot}$단점과 실현가능성을 진단하고, 대표적인 모형에 대한 가상환경을 구성하여 운영비용 측면에서 비교하였다. 또한 AHP기법을 이용하여 관련 전문가 인터뷰를 통한 정성적인 측면에서의 비교도 실시하였다. 셋째, 운영모형분석을 통하여 도출된 최적대안에 대한 다기관 통합전산센터의 상시운영체계의 수립 방향에 대하여 기존의 정보시스템을 위한 방법론과의 비교를 통하여 설명하였다. 넷째, 다기관 통합전산센터의 상시운영체계의 구성방향을 반영한 자동화시스템의 기본적인 구축방안에 대하여 간략하게 정리하고 그 기대효과를 제시하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.62-65
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• 2006

가스하이드레이트의 국내 부존 가능성이 확인됨에 따라 가스하이드레이트 개발기술 및 부존 정보의 확보를 위한 가스하이드레이트 연구개발사업이 추진 중에 있다. 가스하이드레이트 개발사업과 같은 국가주도 연구개발사업의 경우 사업의 타당성 확보와 효율적인 추진을 위해서 사업 및 개발기술의 가치를 객관적으로 평가해야 할 필요성이 높아지고 있다. 본 연구에서는 가스하이드레이트 개발사업의 가치평가를 위한 주요 속성들을 결정하고 속성별 쌍대비교를 통해 중요도를 도출 할 수 있는 Fuzzy AHP 방법론을 사용하여 상대적 가중치를 도출하였다 연구 결과 가스하이드레이트 개발사업 및 기술의 가치는 상위계층으로 직접가치와 유발가치로 나눌 수 있고, 하위계층으로 총 8개의 속성으로 분류 할 수 있는 것으로 분석되었다. 중요도 분석결과 가스하이드레이트를 직접 개발함으로써 얻을 수 있는 개발가치가 사업시행으로 인한 탐사개발 기술의 확보로 유발되는 가치보다 높은 중요도를 가지는 것으로 평가 되었다. 또한 개발가치의 세부항목 중에는 에너지 안보 증진 효과가, 유발가치의 세부항목 중에는 인력양성효과가 가장 중요한 가치평가 요소로 나타났다

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.455-462
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• 2013

As the protection of personal information has been appeared as a main issue in educational institutions, the Ministry of Education, Science and Technology (currently the Ministry of Education) opened InfoSec Training Center to train personnels of educational institutions in 2012. To achieve the purpose of the establishment of the centers, each center needs to identify training target, make training roadmap and design specialized training curriculum. The paper aims to develop criteria to evaluate training and operating levels of InfoSec Training Centers using AHP.