• 컴퓨터교육학회논문지
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• 제13권2호
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• pp.71-80
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• 2010

본 연구에서는 대학정보공시제 사업을 통해 나타난 총괄관리기관과 항목별관리기관간의 자료연계의 문제점을 분석하여 총괄관리기관과 항목별관리기관의 자료연계 내실화 방안을 제시하는 것을 목적으로 한다. 관련된 문제를 규명하고 내실화를 위한 방안들을 도출해 내기 위해서 본 연구에서는 관련된 이전의 연구 자료를 분석하고 항목별관리기관인 한국사학진흥재단 정보공시 항목의 연계현황을 분석하여 문제점을 도출하고 심층면담을 통하여 항목별연계기관의 자료연계 내실화 방안을 도출하였다. 이를 토대로 한 내실화 방안으로 학교 및 학과코드 통합방안, 자료연계 자동화 방안, 정보의 신뢰성 확보 방안을 수립하였다. 본 연구의 결과를 통해 산출된 관리기관간 자료연계 내실화 방안들이 교육과학기술부, 총괄관리기관, 항목별관리기관 및 대학에서 신뢰성 있고 다양한 정보를 제공하는 정보공시사업이 되기 위한 기초 자료로 활용되기를 기대한다.

• 한국시뮬레이션학회논문지
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• 제29권2호
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• pp.95-103
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• 2020

본 논문에서는 경량구조 적용을 위한 구조 접합부 설계를 제시하였다. 압력에 대한 구조 안정성 연구를 위하여 용접부 접합부와 볼트 접합부에 대한 모델을 설계하였다. 확립된 모델의 신뢰성 검증을 위하여, 비선형 해석을 수행하였고, 실험결과와 비교하였을 때 유사한 결과를 확인하였다. 또한 비교연구를 통하여 구조설계 재료와 적합한 용접방법을 선택하였으며, 볼트의 개수와 위치에 따른 파단하중 시뮬레이션을 진행하여 응력에 따른 안정성을 분석하였다. 마지막으로, 접합부 모델을 기반으로 경량 구조를 모델링하고 구조 해석을 수행하였다. 그 결과, 용접부와 볼트체결을 적용하여 설계된 구조가 접합부를 적용하지 않은 구조에 비해 최대응력이 31.4% 감소함을 확인하였다. 이 결과를 토대로, 경량구조의 안정성 해석 시 접합부 모델링의 필요성을 확인하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1327-1335
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• 2011

Recently, also in railway vehicles, related products are being designed and manufactured through RAMS activities in order to secure their reliability, availability, maintainability & safety. Subway operators are conducting R&D on various preventive maintenance methods and applying them to the field so as to establish a reliability centered maintenance(RCM) system. In this connection, manufacturers shall carry out R&D based on reliability from the first design stage of development to provide high quality products to subway operators. And operators shall have the products operated properly to their particular operating environment and managed based on the standard maintenance manual. Not only that, but the related field data shall be fed back into the manufacturers to upgrade upcoming products by organic cooperation between manufacturer and operators. However, the mutually beneficial cooperative relationship is not still developed in the domestic railway industry. In terms of methodology for life prediction, this study was intended to analyze field data on relays used for rolling stocks considering operational characteristics in the position of subway operators and predict parts reliability using reliability prediction program from the standpoint of manufacturers as well.

• 기술혁신연구
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• 제12권1호
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• pp.67-114
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• 2004

This study attempts to integrate causal model with competitiveness evaluation model, both of which have developed independently of each other, in connection with many studies on PMES (performance measurement and evaluation system) including the BSC (balanced scorecard) of Kaplan and Norton (1992, 1996). For this attempt, this study is composed of four analyses : First, this study develops a structural model for evaluating and diagnosing corporate ‘comprehensive’ competitiveness including quality competitiveness, derive CCI (comprehensive competitiveness index) and QCI (quality competitiveness index) ; Second, this study analyzes the determinants of quality competitiveness, the impacts of quality competitiveness, on product design and product reliability, and the impacts of product design and product reliability on quality competitiveness in the comprehensive competitiveness evaluation model of this study. Third, this study empirically identifies the positioning of product design in the quality competitiveness evaluation model of this study and the functional relationship between product design and other functions : product development, manufacturing, marketing, and marketing, and sales in the same comprehensive competitiveness evaluation model, estimate the determinants of product design and its impacts, thereby providing some empirical findings for the foundation of design management theory, and Fourth, this study identifies the positioning of product reliability in the same quality competitiveness evaluation model, estimate the reliability function and the functional relationship between product reliability and other dimensions of product quality, and tests the hypotheses on the causality of product reliability.

• 한국콘텐츠학회논문지
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• 제9권1호
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• pp.45-52
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• 2009

본 논문에서는 통신망의 큐잉망 모델을 링크 고장을 고려한 신뢰도 모델과 함께 개발한다. 가상연결을 갖는 통신망에서 링크 고장시의 신뢰도 분석이 수행된다. 확장된 추계적 페트리 네트인 SRN은 시스템 분석을 위한 다양한 모델링 기능을 제공해 주며 적절한 보상율을 모델에 할당해 줌으로써 원하는 성능지표를 쉽게 구할 수 있다. 재경로를 갖는 신뢰도 분석을 위하여 모델 규격을 정하고 자동으로 모델을 생성하고 그 해를 구하는데 SRN 모델링이 적합함을 보여준다. 링크 고장에 따른 다양한 재경로 설정과 신뢰도 분석을 위하여 SRN을 이용한 마르코프 모델이 개발되고 그 해가 구해진다.

• 마이크로전자및패키징학회지
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• 제10권3호
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• pp.9-17
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• 2003

In this paper, thermo-mechanical and rheological properties of NCPs (Non-Conductive Pastes) depending on silica filler contents and diluent contents were investigated. And then, thermal cycling (T/C) reliability of flip chip assembly using selected NCPs was verified. As the silica filler content increased, thermo-mechanical properties of NCPs were changed. The higher the silica filler content was added, glass transition temperature ($T_g$) and storage modulus at room temperature became higher. While, coefficient of thermal expansion (CTE) decreased. On the other hand, rheological properties of NCPs were significantly affected by diluent content. As the diluent content increased, viscosity of NCP decreased and thixotropic index increased. However, the addition of diluent deteriorated thermo-mechanical properties such as modulus, CTE, and $T_g$. Based on these results, three candidates of NCPs with various silica filler and diluent contents were selected as adhesives for reliability test of flip chip assemblies. T/C reliability test was performed by measuring changes of NCP bump connection resistance. Results showed that flip chip assembly using NCP with lower CTE and higher modulus exhibited better T/C reliability behavior because of reduced shear strain in NCP adhesive layer.

• Earthquakes and Structures
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• 제24권2호
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• pp.141-153
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• 2023

The presented paper considers infill masonry walls' influence on the seismic reliability of precast concrete frames. The recent Bojnord earthquake on May 13th, 2017 in Iran (MW 5.4) illustrated that the infill masonry walls play a crucial role in the damage extent and life safety issues of inhabitants in the precast concrete buildings. The incremental dynamic analysis (IDA) approach was used to determine the fragility curves of the represented damaged precast frame. Then, by integrating site hazard and structural fragilities, the seismic reliability of the represented precast frame was evaluated in different damage limit states. Additionally, the static pushover analysis (SPA) approach was used to assess the seismic performance assessment of the precast frame. Bare and infilled frames were modeled as 2D frames employing the OpenSees software platform. The multi-strut macro-model method was employed for infill masonry simulation. Also, a relatively efficient and straightforward nonlinear model was used to simulate the nonlinear behavior of the precast beam-column joint. The outputs show that consideration of the masonry infilled wall effect in all spans of the structural frame leads to a decrease in the possibility of exceedance of specified damage limit states in the structures. In addition, variation of hazard curves for buildings with and without consideration of infilled walls leads to a decrease in the reliability of the building's frames with masonry infilled walls. Furthermore, the lack of infill walls in the first story significantly affects the precast concrete frame's seismic reliability and performance.

• 전기학회논문지
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• 제64권6호
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• pp.857-863
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• 2015

OF cable with excellent reliability and economic efficiency, has been used as the main cable of underground transmission in Korea. However, as XLPE cable is excellent in view points such as reduction of loss, convenience on the construction/operation, and manufacturing technology, it has been replaced as instead of OF cable. Also, when the aging occurs in some sections of OF cable, the section is replaced as XLPE cable without changing of whole cable line. However, there are some differences like electrical constants between both types of cables. Therefore if underground transmission system will be operated as combined connection composited of both cables, it should be proved that overvoltage is stable in steady and transient state. This paper describes the effectiveness of connection operation in combined OF and XLPE cable. For the evaluation of effectiveness, some important analysis such as sheath component voltage, lightning and switching overvoltage, single line-to-ground fault are carried out in steady and transient state. EMTP/ATPDraw is used for modeling and analysis of system.

• Journal of Advanced Research in Ocean Engineering
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• 제3권3호
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• pp.125-135
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• 2017

The paper considers the practical application of the FMEA(Failure Mode and Effect Analysis) method to assess the operational reliability of the LNG(Liquefied Natural Gas) transfer system, which is a potential problem for the connection between the LNG FPSO and LNG carrier. Hazard Identification (HAZID) and Hazard operability (HAZOP) are applied to identify the risks and hazards during the operation of LNG transfer system. The approach is performed for the FMEA to assess the reliability based on the detection of defects typical to LNG transfer system. FTA and FMEA associated with a probabilistic risk database to the operation scenarios are applied to assess the risk. After providing an outline of the safety assessment procedure for the operational problems of system, safety assessment example is presented, providing details on the fault tree of operational accident, safety assessment, and risk measures.

• 전기학회논문지P
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• 제60권3호
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• pp.133-137
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• 2011

The purpose of smart grid is the low $CO_2$ through expansion of renewable energy. To achieve the purpose of smart grid, typical radial power distribution system will be changed to loop power distribution system. The loop power distribution system have many advantages such as low power loss, low voltage drop, and increase of connection of renewable energy. In this paper, the algorithm for minimization of interrupted section of power distribution system is proposed through communication between circuit breaker and recloser in loop power distribution system. The proposed algorithm is proved through case studies about reliability evaluation