• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1294-1296
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• 2003

For this research, we developed the hardware and software of the measurement system for on-line test and evaluation. The software controls the hardware of the mesurement data and acts as interface between users and the system hardware. In this paper, we is studied for Aux. Block performance of railway vehicle. In order to this test is developed signal conversion system. Using this system. we obtained important result for battery voltage, Aux. Block temperature.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1323-1325
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• 2003

In field of Urban transit safely, It must be not only secured vehicle but also every areas like power, signal, communication, track, tunnel, operating facilities. Likewise it is very important not only hardware system like vehicles, facilities but also software system like action of engine driver, duty officer. In other to secure safety of hardware, soft ware, it is very important systemic process. In Korea, Many operating companies neglect to invest in safely and ignore technical development about safety because of management. Safely was considered in subway system and many studies were accomplished about safety in subway system in advanced county like U.K, USA. Hence, in this paper, Conditions and improvement of minimum considerable hardware and software are proposed for safe operation in Urban transit.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2459-2461
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• 2003

본 논문은 차량 내에 설치된 두 대의 CCD 카메라를 이용하여 도로 영상으로부터 주행차선내에 있는 장애물을 인식하는 새로운 알고리즘을 제시한다. 제안된 알고리즘은 주행하는 차선과 관련이 있는 차선 정보만을 이용하여, 스테레오 영상에서 변이도를 추출할 수 있는 변이도 함수인 DLI(Disparity of lane-related information)를 정의하였다. DLI는 선행 차량과 같은 장애물은 주위보다 상대적으로 큰 에지값을 가진다는 특성을 이용하여, 주행차선 내에 있는 장애물의 유무를 검출하고 위치를 유추한다. 제안된 방법은 특징점의 탐색공간을 현저히 줄여 실시간 처리문제를 해결한 수 있는 장점을 가지고 있다. 본 논문에서는 DLI를 이용한 선행차량 인식기법의 성능을 검증하기 위하여 다양한 환경의 도로영상에 알고리즘을 적용하여 제안한 방법의 우수함을 확인하였다.

• Proceedings of the KIEE Conference
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• 1996.11a
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• pp.19-21
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• 1996

In this paper, the experiment on the dynamic characteristics of LIM for the propulsion system UTM(Urban Transit Maglev) is threated. Untill now LIM has been mainly experimented by using the rotational arch type system, but this system compose of the test vehicle mounted LIM, which driven by PWM inverter. And the anlysis of the performance and the steady-state characteristics of the LIM is treated under various operation patterns. This paper may be available to compose the operating system of LIM driven by the open or closed loop control.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.271-273
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• 1993

One maglev vehicle is composed of 6 or 8 modules. Each module is composed of 4 staggered magnets attached to an aluminum bogie. In the view point of levitation control except propulsion-by LIM. 5 is the maximum degree of freedom to be controlled. But rolling control of the vhhicle depends on the bogie structure. We describe just anti-roll type bogie structure and 4 degree of freedom control is sufficient for levitation quality improvement. Multivariable pole-placement concept is used for controller design. Control experiment is performed on a specially designed test module as well as actual bogie system.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1341-1343
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• 2003

전동차는 운행중 다양한 정보를 차상의 각 컴퓨터장치에 저장한다. 수집된 차상정보는 계획수립 및 검수, 정비 등에 중요한 정보로 활용하기 위하여 지상의 컴퓨터로 이동 후 관리된다. 기존의 차상정보 수집방법은 인적, 시간적 손실이 많이 발생하며, 데이터의 관리가 어려워 실제적인 업무에 참고하기 위한 정보로 가공하기가 곤란하므로, 무선을 이용한 자동수집시스템에 대한 방안을 제안한다.

• Proceedings of the KIEE Conference
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• 2009.04b
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• pp.9-11
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• 2009

자동차 EPS(Electric Power Steering)용 소용량 표면부착형 영구자석 동기전동기(SPMSM : Surface mounted Permanent Magnet Synchronous Motor)의 설계에는 주로 토크리플 및 코깅토크 저감이 설계목표로 결정되는데, 토크리플과 코깅토크는 치폭, 요크폭, 자석 극호각 등 전동기 형상에 영향을 많이 받는다. 특히, 자석 극호각에 따라 변동이 극심한데, 이는 출력특성이 공극 자속밀도 변화량에 크게 의존하기 때문이다. 한편, 일반적으로 토크리플과 코깅토크의 최소점은 각각 다르기 때문에, 소용량 SPMSM 설계시 큰 어려움으로 작용한다. 따라서 본 논문은 이러한 현상을 효과적으로 고려한 소용량 SPMSM 최적설계를 목적으로 하며, 600W급 고전압 EPS용 전동기 설계를 통해 연구의 타당성을 검증한다.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.4
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• pp.37-43
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• 2003

The exhaust gas recirculation (EGR) is needed for one of various strategies to reduce NOx emission. But to get the proper EGR rate, the intake and exhaust system become complicated, also application of EGR system is difficult because of the penalty in fuel consumption and the increase in particulate matter. This study is focused on the development of EGR valve using the electrical method. The effects of EGR on the characteristics of NOx, CO, CO2 emissions and particulate mater have been investigated using small-displacement size 0.8-liters engine of diesel passenger car operating at several loads and speeds. After the analysis and comparison between conventional E-EGR valve and developed E-EGR valve performance by test bench, the estimation of vehicle application was executed through the EGR map and CVS-75 test result measured on the chassis dynamometer.

• Transactions of the Korean Society of Automotive Engineers
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• v.6 no.6
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• pp.166-173
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• 1998

The evaluation of joint fatigue strength of light weight materials for an electrical vehicle body has been performed through T-peel joint tests with the design parameters such as joint style, adherend type, adherend thickness, adhesive thickness, and various adhesives. Fatigue strength was evaluated through 5-Hz, tension-tension, load controlled test with the zero stress ratio. It was observed that the fatigue strength of the joint increases with the increase of the adherend thickness. With the increase of the adhesive thickness, however, the fatigue strength of the joint increases insignificantly. An aluminum-FRP adherend combination shows much higher fatigue strength than an aluminum-aluminum adherend combination. The results of fatigue tests were found to be consistent with those of static tests.

• Proceedings of the KIEE Conference
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• 2007.11a
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• pp.206-207
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• 2007

We developed a measurement system for on-line test and evaluation of performances of KHST. The measurement system is composed of software part and hardware part. Perfect interface between multi-users is possible. A new method to measure temperature was applied to the measurement system. By using the system, fault diagnosis and performance evaluation of electric equipment in Korean High Speed Train was conducted during test running.