• 한국음향학회지
• /
• 제18권1호
• /
• pp.92-96
• /
• 1999

CMOS 기술이 발달됨으로써 고집적화에 따른 합선고장이 상대적으로 증가하고 있다. IDDQ 테스트는 기능테스트로 검출하기 어려운 합선고장을 효율적으로 검출하여 회로의 신뢰성을 향상시키는 기법이다. 본 논문에서는 테스트 대상 논리회로의 각 게이트 내부에서 발생 가능한 합선고장에 대한 시뮬레이션을 수행하기 위한 IDDQ 테스트용 고장 시뮬레이터를 개발하였다.

• 대한전기학회논문지:전력기술부문A
• /
• 제48권6호
• /
• pp.712-718
• /
• 1999

When a fault occurs in power transmission systems, protective relays play a roles of protecting the power system according to there setting values. Therefor, it is important that protective relays have high selectivity and sensitivity by correct setting the involves a large volume of data and is a complicated and very tedious, therefore vulnerable to the human errors. Also, it is very difficult to verify that the relays have correct operating parameters before the fault occurs. This paper porposed a method to testify the reliability of realys by showing the operation response to faults in the simulation of the real power system operation environment.

• 한국항공우주학회지
• /
• 제35권9호
• /
• pp.843-849
• /
• 2007

최근 급속히 발전하고 있는 소프트웨어 엔지니어링, 특히 객체 지향 설계 개념은 위성 컴포넌트의 시뮬레이션 모델을 신뢰성과 재사용성의 측면에서의 발전이 가능하게 하였다. 이 논문은 시뮬레이션 서비스와 일반화된 모델 설계 방법에 기초한 유용한 위성 시뮬레이터 구조를 제안한다. 제안된 기법의 유용성은 .NET/C# 환경에서의 프로토타이핑을 통해 검증되었다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2001년도 춘계학술대회 논문집
• /
• pp.760-763
• /
• 2001

In this study, the graphical design system is developed and the digital mock-up is implemented for designing the spent fuel handling and disassembling processes. This system is used throughout the design stages from the conceptual design to the motion analysis. By using this system, all the processes involved in the spent fuel handling and disassembling precesses are analyzed and optimized. Also, this system is used in developing the on-line graphic simulator to enhance the reliability and safety of the spent fuel handling process by providing the remote monitoring function of the process. The graphical design system and the digital mock-up system can be effectively used for designing the process equipment, as well as the optimization of the main processes and maintenance processes of the spent fuel management.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 춘계학술대회 논문집
• /
• pp.1403-1407
• /
• 2007

The bogie of Rolling Stock is the basic rolling component. It operates the train body, guides the body considering various tracks and offers comfort to passengers. We can verify the safety level of bogie about all factors through the first -grade scenario of Preliminary Hazard Analysis, but especially the horizontal acceleration sensor, equipped in each power bogie and trailer bogie, is the device, which makes it possible to test bogie instability and uncomfortable body movements by the method, similar to actual train driving, and in this context the necessity of this device becomes important. This paper would classify the main functions of driving sub system and examine the reliability, availability, maintainability and safety, which are main factors of RAMS. Especially, we would realize the bogie instability sensor with a simulator and offer the content in analyzing the data by the statistical method, which are obtained through the connected test with OBCS.

• International journal of advanced smart convergence
• /
• 제5권2호
• /
• pp.1-7
• /
• 2016

Recently, with the development of advanced thin film devices comes the need for constant high quality vacuum as the deposition pressure is more demanding. It is for this reason our research seeks to understand how the variable design factors are employed in such vacuum systems. In this study, the effects of design factor applications on the vacuum characteristics were simulated to obtain the optimum design modeling of variable models on an ultra high vacuum system. The commercial vacuum system simulator, $VacSim^{(multi)}$, was used in our investigation. The reliability of the employed simulator was verified by the simulation of the commercially available models of ultra high vacuum system. Simulated vacuum characteristics of the proposed modeling aligned with the observed experimental behavior of real systems. Simulated behaviors showed the optimum design models for the ideal conditions to achieve optimal pressure, pumping speed, and compression ratio in these systems.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
• /
• pp.186-188
• /
• 2002

Recently, power system has a trend of sustaining increase of power demand and large-sized system. Also, consumers has required a high reliability for the power quality in deregulated power industry. For power system operator, the accurate decision for situations of power systems and the ability of the management for the faults are required. Therefore, in this paper we presents the development of simulator which can train the process of the recovery and the decision of contingency in the case of the occurrence of faults for generation, transmission, and distribution facilities.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 하계학술대회 논문집 A
• /
• pp.160-162
• /
• 2003

Recently, power system has a trend of sustaining increase of power demand and large-sized system. Also, consumers has required a high reliability for the power quality in deregulated power industry. For power system operator, the accurate decision for situations of power systems and the ability of the management for the faults are required. Therefore, in this paper we presents the development of simulator which can train the process of the recovery and the decision of contingency in the case of the occurrence of faults for generation, transmission, and distribution facilities.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1993년도 하계학술대회 논문집 A
• /
• pp.152-155
• /
• 1993

Protective Relay in power system play a prominent part in minimizing power delivery interruptions and help to get a fast and secure restoration when a failure occurs. In order to meet the higher functional requirements in power system, the performance tests on response characteristic of protective relay is essential to ensure reliability. The purpose of this study is as follows: In order to evaluate performance of protective relay, it is intended to develop performance of digital protective relay simulator which is composed of digital protective relay part, behaviour analysis part, waveform generation part and simulation program to simulate pour system in detail.

• Journal of Electrical Engineering and Technology
• /
• 제9권3호
• /
• pp.1072-1079
• /
• 2014

This paper introduces a coordinated droop control for the stand-alone DC micro-grid, which is composed of photo-voltaic generator, wind power generator, engine generator, and battery storage with SOC (state of charge) management system. The operation of stand-alone DC micro-grid with the coordinated droop control was analyzed with computer simulation. Based on simulation results, a hardware simulator was built and tested to analyze the performance of proposed system. The developed simulation model and hardware simulator can be utilized to design the actual stand-alone DC micro-grid and to analyze its performance. The coordinated droop control can improve the reliability and efficiency of the stand-alone DC micro-grid.