• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.194-197
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• 2004

본 논문에서는 송전 계통사고 시 부하차단 이후 우리나라 2005년 계통에 대하여 전력계통안정화장치(Power System Stabilizer : PSS)의 영향 및 효과를 캐나다 Powertech Labs Inc.,의 TSAT(Transient Security Assesment Tool)을 이용하여 분석하였다. 모의를 위한 송전선로의 사고는 765kV 선로와 345kV 선로를 대상으로 하였으며, 8개의 모선에 대하여 상정 사고를 발생시켜 선로 차단 및 재투입을 고려하여 실시하였다. 본 연구에서 TSAT에 대한 기존의 전통적인 형태인 IEEEST type과 보다 정교한 이중구조를 가진 PSS2A type의 두 가지를 검토한 결과를 살펴보면 절반의 경우가 발전단 인근 지점의 사고시 발전기가 안정을 회복하지 못하고 탈조하는 것으로 나타났다. 그 외의 지역의 모선 단의 PSS투입효과는 비교적 댐핑 효과가 있는 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.227-229
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• 2004

In a new competitive market environment, it is very important to determines how much power can be transferred through the network. It's known as Available Transfer Capability(ATC). This paper presents a technique to evaluate Reliability Assesment and the Available Transfer Capability of Haenam-Cheju HVDC transmission system using Well-being Method which is based on the probabilistic method. The system Well-being is categorized in terms of the system Healthy and Marginal in addition to the conventional Risk index. Haenam-Cheju HVDC system has been studied for the optimal ATC based in well-being categories.

• Journal of the Korean Statistical Society
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• v.19 no.2
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• pp.151-159
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• 1990

Regression diagnostics often involves assesment of the changes that result from deleting multiple cases. Diagnostic mehtodology based on global influence measure, however, needs prohibitive computing time. As an alternative, Cook (1986) developed influence approach in which it is checked whether a minor modification of specifiation influences key results of an analysis. In line with Cook's development, we propose and study an inflence derivative method that yields both the magnitude and direction of case influences. The utility of our methodology is highlighted when case influence derivatives are plotted in a lower demensional space. Such plots are especially effective in unmasking "masked" observations in least squares regression and in robust regression also. We give several illustrations.strations.

• Journal of Korean Society of Transportation
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• v.7 no.2
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• pp.71-87
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• 1989

The objectives of this study are first, to evaluate the actual performance of the Transportation Impact Assesment System of Korea, second, to find the institutional problems of the system, and third, to seek for the best improvement of the system. Total 70 assessment reports performed in 1988 and judgements of the municipal councils of the reports were inspected. And the legal system of all levels were reviewed. According to the results, there are some needs to expand the number of cities subject to the assessment system. And the several regulations about the qualification of the agents assessing transportation impacts, the composition and operation of the municipal councils, and the timing of assessing the impacts are turned out improper. A proper alternative of amendment of the regulations are recommended. And the establishment of central council for judging assessments of hudge facilities, adoption of joint assessment of facilities bellow the standard, post occupancy assess ent, and transportation fee system were also recommended.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1997.10a
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• pp.222-226
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• 1997

The reproducibility of measured level is a prior condition for the reliable assessment of the sound insulation performance. To review the reproducibility of impact sound level, 20 floors were selected in highrise apartment house, and then impact sound levels of two kinds of typical floors were measured with 10 times in each receiving point. The impact sound insulation class values were derived with a standard tapping machine and bang machine. Inspection of the result showed that smaller scale of the room caused to lower the reproducibility and that the higher values of standard deviation in lower frequency caused to deteriorate the reliability of assesment. Thus to enhance the reproducibility of the impact sound insulation class, greater allowable deviation of measured level is required in lower frequency than in higher one.

• Fire Science and Engineering
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• v.7 no.1
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• pp.17-29
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• 1993

The method has been proposed for the risk assessment of petro-chemical plant, specially which can evaluate relative risk levels on the materials and process-es. The each potential risk of materials and processes are derived numerically and combined these values, finally Fire and Explosion Index was found. Material factor was evaluated with the flammability and the reactivity and process factor with emprical factor called penalty. This F&EI can be performed for relative risk assesment at the whole plant and directely applicable at the line.

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.116.2-116
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• 1999

No Abstract, See Full Text

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.250-250
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• 2018

최근 기후변화의 영향으로 국지성 폭우 및 태풍 등의 발생횟수가 증가되고 있으며 이로 인하여 홍수피해 및 도시침수 등의 사고가 빈번히 발생하고 있다. 이 중 도시하천 및 중소규모의 하천에서 발생하는 피해는 단시간으로 발생하고 있으며 빠른 시간안에 침수면적 및 침수피해액을 산정하는 것이 어렵다. 따라서 본 연구에서는 Tuflow와 다차원법을 이용하여 침수피해액 산정 시스템을 개발하였으며 강우 및 지속시간에 대한 침수Database와 침수피해액 Database를 구축하였고 이를 이용하여 실제 발생하는 강우 및 레이더 예측강우를 이용하여 실시간으로 침수면적 및 피해액을 추정하였다. 본 연구를 통하여 실시간으로 발생하는 강우에 대하여 침수피해면적 및 피해액을 나타낼 수 있었으며 실시간 홍수부분에 활용성이 높을 것이라 판단된다.

• Journal of the Korea Safety Management & Science
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• v.14 no.4
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• pp.23-29
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• 2012

There are insufficient models that find problems and solutions for accident prevention through risk assessment and suggest safe work process and work instruction from foundation works to finish work for accident decrease. This paper presents a quantitative risk assessment model by analysis of risk factors in each process such as appurtenant works, temporary works, structural works, equipment work, finishing work and etc based on accident examples and investigation on actual condition in plants construction work. In addition, the safety management system was developed to perform risk assessment of plants construction and use it for effective safety training for labor.

• Proceedings of the KSR Conference
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• 1999.11a
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• pp.542-549
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• 1999

The purpose of this study is to investigate stability of a high speed train and to propose optimal design using sensitivity analysis of suspension design parameters. A form of equations of motion in tangent track and curve track is obtained based on each creep force. Tangent track and curve track equations include lateral, rolling and yawing motions of wheel sets, bogies, and carbodies. Three track cases have been chosen to stability assesment of a high speed train analysis. Sensitivity equations are set up by directly differentiating the equations of motion. This study def'.led Stability performance index of a high speed train in tangent track and curve track. The relative magnitude of the effect of suspension parameters on the critical speed is computed, and by adjusting these parameters, the increase of the critical speed is achieved.