• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1915-1916
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• 2006

Recently, for positioning a train and synchronizing between equipments in railway environment, the utilization of GPS(Global Positioning System) is increasing. But, the defects of GPS are pointed out. The risk of dependence on only GPS is not neglectable. Therefore, we prepare the implementation of the future railway system through the research on the safety and reliability of applying GPS to railway system.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.859-864
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• 2007

The rolling stock which is used the most frequently by public transportation has to secure reliability and safety. In these, vibration is the important factor which causes of serious problem of rolling stock. By the way, rolling stocks vibration test specific activity that is using translating JIS standard is serious mistake, but it is actuality that is used until present more than ten years. Study wishes to analyze problem of standard of domestic rolling stocks and present countermeasure.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.28-31
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• 1990

Electromagnetic levitation system became power-full because of Its high speed, safety, reliability, and so forth So, in this paper, various characteristics of magnet in electromagnetic levitation system were analyzed by Finite Element Method and its design parameters were proposed by simulation results.

• Journal of Ocean Engineering and Technology
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• v.11 no.3
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• pp.1-7
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• 1997

본 논문에서는 해얀구조물의 신뢰성을 평가할 수 있는 새로운 방법을 제시하였다. 우선 구조의 저항능력에 대한 응답면을 구축하였고, Person 곡선중 하나를 이용해서 응답면을 근사 시킨후 Monte-Carlo Simulation을 수행하였고, 최종적으로 수치적분법을 적용해서 파괴확률을 구하였다. 해양구조물에의 적용을 통해 본 논문의 방법이 갖는 정당성을 보였다.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3175-3177
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• 1999

In this study, the wireless communication system configuration and major equipments for KNGR will be introduced. Also the reliability and safety impact on the KNGR will be checked by reviewing /testing the EMI/RFI conditions of wireless communication system, The elements of the wireless communication system are radio exchange, base stations, portable telephone handsets.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.136-139
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• 2010

본 연구에서는 일반 건물에 적용되는 스프링클러시스템에 비해 보다 높은 신뢰도를 요구하는 클린룸에서의 스프링클러시스템에 대해 국내 L사, S사 클린룸 건설 현장의 방문 조사를 통하여 최적의 소화효과를 발휘하며 신뢰도 향상을 위한 설계 및 시공기술 실태조사를 분석하여 클린룸 화재로부터 안전성을 확보 하고자 한다.

• Journal of Industrial Convergence
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• v.1 no.1
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• pp.115-126
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• 2003

In order to examine the determinants of new product success, winning products are analyzed with a focus on merchantability. The specific dimensions of product advantage have not been studied as yet. As results of the analysis, the determinants are classified into function, aesthetics, economy, safety, usability, reliability, brand image, assurance, distribution channel, advertisement, DEF(design for the environment). This study augmented the data set through questionnaire survey to marketing professor in University. The results of this study would be a cue to the future direction of new product development and to management of exist product.

• Journal of Korea Water Resources Association
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• v.43 no.11
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• pp.967-976
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• 2010

AFDA (Approximate Full Distribution Approach) model of FORM (First-Order Reliability Model) which can quantitatively calculate the probability that storm sewer reach to performance limit state was developed in this study. It was defined as a failure if amount of inflow exceed the capacity of storm sewer. Manning's equation and rational equation were used to determine the capacity and inflow of reliability function. Furthermore, statistical characteristics and distribution for the random variables were analyzed as a reliability analysis. It was found that the statistical distribution for annual maximum rainfall intensity of 10 cities in Korea is matched well with Gumbel distribution. Reliability model developed in this study was applied to Y shaped storm sewer system to calculate the probability that storm sewer may exceed the performance limit state. Probability of failure according to diameter was calculated using Manning's equation. Especially, probability of failure of storm sewer in Mungyeong and Daejeon was calculated using rainfall intensity of 50-year return period. It was found that probability of failure can be significantly increased if diameter is decreased below the original diameter. Therefore, cleaning the debris in sewer pipes to maintain the original pipe diameter should be one of the best ways to reduce the probability of failure of storm sewer. In sewer system, two sewer pipes can flow into one sewer pipe. For this case, probability of system failure was calculated using multiple failure mode. Reliability model developed in this study can be applied to design, maintenance, management, and control of storm sewer system.

• Journal of the Korea Concrete Institute
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• v.17 no.6 s.90
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• pp.955-962
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• 2005

Still no accurate theory exists for predicting ultimate shear strength of deep reinforced concrete beams because of the structural and material non-linearity after cracking. Currently, the load capacity assesment is performed for the upper structure of the bridges and containing non-reliability in the applications and results. The purpose in this study is to evaluate analytically the complex shear behaviors and normal strength for the reinforced concrete deep beams and to offer the accuracy load capacity assesment method based on the reliability theories. This paper presents a method for the load capacity assesment of reinforcement concrete deep beams using nonlinear finite element analysis. A computer program named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material non-linearity is taken Into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. From the results, determine the reliability index for the failure base on the Euro Code. Then, calculate additional reduction coefficient to satisfy the goals from the reliability analysis. The proposed numerical method for the load capacity assesment of reinforced concrete deep beams is verified by comparison with the others methods.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.939-950
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• 2011

In this study, the load test of rubber tire bogie for monorail type LRT. Bogie for rolling stock in safety operation of the vehicle as an essential core unit before applying to the vehicle safety and reliability should be tested sufficiently. Rubber tire monorail type bogie compared to the traditional bogie wheel lots of formats, the complexity of the load acting static load test, the bogie of the vehicle operation conditions by structural analysis by considering the loading conditions was evaluated by calculating. Test methods and evaluation criteria based on urban rail vehicle performance testing by applying the test were welded parts and materials for the results leading to material fatigue endurance test by applying the result of evaluating the structure has been identified as safe.