• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.376-378
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• 2003

소프트웨어 개발 중 분석과 설계 단계에서 만들어진 산출물을 이용하여 개발될 소프트웨어의 신뢰도를 예측하는 초기 소프트웨어 신뢰도 모델은 소프트웨어의 품질을 보증하는 유용한 도구로써 사용될 수 있다. 기존의 소프트웨어 신뢰도 모델은 개발될 소프트웨어의 품질에 한정하여 신뢰도를 예측함으로써 기존 시스템과 연계된 신뢰도를 예측하는데 한계가 있다는 단점과 개발자의 개발 능력이 개발될 소프트웨어 신뢰도에 미칠 영향을 고려하는데 한계가 있다는 단점이 있었다. 그러므로, 본 논문은 기존 시스템과의 연관성을 고려한 초기 소프트웨어 신뢰도 모델을 기준으로 개발자의 개발 능력을 고려한 종합적인 초기 신뢰도 모델을 제시하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.13 no.1
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• pp.13-20
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• 1995

Error analysis is important in horizontal positioning. In case of error analysis, standard error ellipse is generally used to establish the precision regions, but it will be replaced by 95% confidence ellipse. It is more effective than standard error ellipse in resection for measured procedures and establishment for criterias of relative error. Therefore, In this paper deals with analysis of application to 95% confidence ellipse in horizontal positioning. This study deals with error analysis of plane trilateration network which are various types of control point. also, this paper have studied for theory of error analysis in order to using least square adjustment. Thus, This paper's conclusion are as follows; 95% confidence ellipse could be used to establish of specification in korea, also, it is possible for us to predesign for optimum surveying network by 95% confidence ellipse.

• Journal of the KSME
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• v.51 no.8
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• pp.49-52
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• 2011

이 글에서는 선박 및 해양구조물 분야에서 신뢰성 기반 관련 내용을 정리하고, 특히 최종한계상태(Ultimate Limit State) 및 피로한계상태(Fatigue Limit State) 설계에 관해 이루어지고 있는 최근 연구결과를 요약 정리하였다.

• Proceedings of the Korean Reliability Society Conference
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• 2000.04a
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• pp.89-96
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• 2000

VTR 제품에 대해 소비자가 만족하는 신뢰성을 보증하기 위해, 내구수명시험을 10,000시간 실시하여 제품의 특성치 변화와 고장률이 만족하는지 검토하였다. 아울러 시간의 경과에 따른 제품의 특성치 변화를 관측하여 고장분포를 추정하였고 실험실에서의 고장유형과 시장에서의 불량유형과 일치여부를 분석하였다. 내구수명시험 결과에서 제품의 특성치 변화와 Field의 시장불량 관계등은 제품에 중요한 요인이기 때문에 이를 바탕으로 신뢰성 방향을 재검토하는 계기가 되었다. 제품의 신뢰성을 향상시키기 위해 시험을 많이 실시하지만, 시험으로 모든 것을 검출하기에는 한계가 있으며 또한 많은 시험 시간이 소요되기 때문에 현업에 적용하기에는 한계가 있었다. 본 연구에서는 제품의 신뢰성을 향상시키기 위해 내구수명시험과 더불어 제품의 설계 마진 분석, 그리고 고장분석을 같이 추진해야만 단시간 신뢰성을 향상시키는데 좋은 지름길임을 제시하였다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.32 no.6
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• pp.458-464
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• 2020

Calibration of load-resistance factors for the limit state design of perforated caisson breakwaters are presented. Reliability analysis of 12 breakwaters in nationwide ports was conducted. Then, partial safety factors and load-resistance factors were sequentially calculated according to target reliability index. Load resistance factors were optimized to give one set of factor for limit state design of breakwater. The breakwaters were redesigned by using the optimal load resistance factor and verified whether reliability indices larger than the target value. Finally, some load-resistance factors were proposed by changing target reliability index.

• Proceedings of the Korean DIstribution Association Conference
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• 2003.11a
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• pp.323-343
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• 2003

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.2
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• pp.21-29
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• 1993

In this paper, a probability-based reliability analysis was proposed based on a finite element method-based random vibration analysis and serviceability limit state of structures. The limit state model defined for the study is a serviceability limit state in terms of the more realistic crack failure that might cause the emission of radioactive materials. The SAP V-2 is used for a three-dimensional finite element analysis of concrete containment structure, and the reliability analysis is carried out by modifying HRAS reliability analysis program for this study. In this study, the load factors for the design of reinforced concrete cointainment structures in Korea are proposed by considering appropriate load combination criteria for design, and the results are compared with the present ASME code. The proposed load factors were proved to be in accordance with a set of code performance objective and showed consistency in the limit state probability.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.1
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• pp.158-166
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• 2008

Member force, strain and stress distribution of a section are obtained for prestressed steel and concrete(PSSC) composite bridge subjected to dead and live load in order to interpret the effect of prestressing and deformation of tendon. The stress and strain distribution and moment capacity are obtained for both noncomposite and composite section and for allowable stress limit state, yield limit state and strength limit state. Reliability analysis is conducted after assuming limit states for deflection, stress and flexural strength. Comparing that the reliability index for stress is near 0 for example section which is designed to satisfy the allowable stress exactly, the reliability indexes for deflection and flexural strength are high. Reliability of PSSC girder which is designed based on allowable stress of bridge design code is high for deflection and flexural strength.

• Journal of the Korean Society for Railway
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• v.19 no.2
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• pp.187-194
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• 2016

It is necessary to determine reliability indexes of existing railway bridges prior to setting up a proper target reliability index that can be used to introduce a reliability based limit state design method to design practice. Reliability is evaluated for a six PSC-I girder railway bridge, which is one of many representative types of double-track railway bridges. The reliability assessment is carried out for an edge girder subjected to bending moment. In the assessment, the flexural resistance and the fixed-load effect were obtained using existing statistical values from previous research on the introduction of limit state design to road bridge design. On the other hand, the live-load effect was determined using statistical values obtained from field measurement for the Joong-ang corridor, on which heavy freight trains are frequently passing. The reliability assessment is performed by AFOSM(Advanced First Order Second Moment method) for the limit state equation, and a sensitivity analysis for the reliability is performed for each factor of the load and resistance effects.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.33 no.6
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• pp.293-297
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• 2021

Calibration of load-resistance factors for the limit state design of front covered caisson breakwaters were presented. Reliability analysis of the breakwaters which are constructed in Korean coast was conducted. Then, partial safety factors and load-resistance factors were sequentially calculated according to target reliability index. Load resistance factors were optimized to give one set of factor for limit state design of breakwater. The breakwaters were redesigned by using the optimal load resistance factor and verified whether reliability indices larger than the target value. Finally, load-resistance factors were compared with foreign country's code for verification.