• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2718-2725
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• 2011

The VAL 208 in Uijeongbu Light Rail system is a light railway vehicle which could be operated in driverless supported by Siemens. It is a Rubber Wheel Type AGT (Automatic Guideway Transit). It will be operated in two car train about 11km of Uijeongbu line. In this paper, the technical overview of the ATC system and the interface between the system and the way side control equipments are presented. It includes the main functions of OBCU(On Board control Unit) and its information sharing method with WCU(Way side control Unit). The testing procedure of OBCU is also discussed.

• Proceedings of the KIEE Conference
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• 1991.07a
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• pp.277-280
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• 1991

We have developed 154kV OF cable accessories from 1987. 4 to 1990. 10 by doing assembly design, investing equipment, manufacturing inspecting parts, type testing in labortary, in our company, in KEPCO. The one of those accessories. Oil Stop Joint, has been developed by using Shield Metal Embeded Type Epoxy Unit. This is More reliable than old type.

• The Korean Journal of Applied Statistics
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• v.7 no.1
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• pp.103-112
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• 1994

An asymptotic property of the estimated eigenvalues for multivariate AR(p) process which consists of vector of nonstationary process and vector of stationary process is developed. All components of the nonstationary process are assumed to reveal random walk behavior. The asymptotic property is helpful in understanding multiple unit roots. In this paper we show the stationay part in multivariate AR(p) process does not affect the limiting distribution of estimated eigenvalues associated with the nonstationary process. A test statistic based on the ordinary least squares estimator for testing a certain number of multiple unit roots is suggested.

• The Journal of the Acoustical Society of Korea
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• v.20 no.2E
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• pp.3-8
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• 2001

In this paper, we will examine a Korean large vocabulary continuous speech recognition (LVCSR) system for broadcast news speech. The combined vowel and implosive unit is included in a phone set together with other short phone units in order to obtain a longer unit acoustic model. The effect of this unit is compared with conventional phone units. The dictionary units for language processing are automatically extracted from eojeols appearing in transcriptions. Triphone models are used for acoustic modeling and a trigram model is used for language modeling. Among three major speaker groups in news broadcasts-anchors, journalists and people (those other than anchors or journalists, who are being interviewed), the speech of anchors and journalists, which has a lot of noise, was used for testing and recognition.

• Journal of the Korean Society of Safety
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• v.19 no.3 s.67
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• pp.118-123
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• 2004

The more the lift environment eastern idea, culture, factory automation system and information technology complicates, the more the various human error brings about. It brings about all kind of accidents and occupational diseases. Also the death and sickness or injury by psychological stress among the human error has increased every year. Therefore this paper describes the Korean lift change unit model through statistical testing with the proposed life change unit factors on the married workers living the middle area. The proposed model can be simply used in order to minimize the industrial accident and human error in real fields. Finally, the result will be helpful for the better safety management.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.116-117
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• 2013

The real time simulator for testing the high power inverter unit of a PM synchronous motor is proposed. The power converter of the real time simulator can replaces the dynamo test equipment that consists of a PMSM(PM synchronous motor) and load unit. It is verified by the simulation that the real time simulator has a similar electrical and mechanical characteristics of the PM synchronous motor.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1611-1614
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• 2002

하나의 보드에 대한 소자들의 테스팅을 위해서 IEEE 1149.1이 제안되었고 완전한 테스팅을 지원한다. 하지만 여러 보드에 대해서는 불가능하여 IEEE 1149.1을 확장한 시스템 레벨의 테스팅 방법이 제안되었다. 기존의 IEEE 1149.1을 확장한 방법은 보드 레벨의 테스팅과 시스템 레벨의 테스팅이 하나의 데이터 패스에 의해서 테스트 시간이 길고 비효율적이다. 본 논문에서는 보드 레벨 테스팅과 시스템 레벨 테스팅을 구분하여 불필요한 테스트 데이터 이동을 줄여 테스트 시간을 줄이고 효율적인 방법을 제시한다. 그리고 이를 지원하기 위한 Path Select Unit을 설계한다. 구현된 PSU는 작은 게이트 사이즈로 적은 테스트 비용으로도 효율적으로 시스템 레벨 테스팅이 가능해진다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.11a
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• pp.243-244
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• 2023

The quality of ready-mix concrete, a decisive factor in the performance of a structure, has recently been ensured by considering the unit water testing method, and this study experimentally examined the reliability of evaluation results based on this method.

• Journal of Welding and Joining
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• v.34 no.5
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• pp.13-18
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• 2016

Toshiba has developed a laser peening system for PWRs(pressurized water reactors) as well after the one for BWRs(boiling water reactors), and applied it for BMI(bottom-mounted instrumentation) nozzles, core deluge line nozzles and primary water inlet nozzles of Ikata Unit 1 and 2 of Shikoku Electric Power Company since 2004, which are Japanese operating PWR power plants. Laser pulses were delivered through twin optical fibers and irradiated on two portions in parallel to reduce operation time. For BMI nozzles, we developed a tiny irradiation head for small tubes and we peened the inner surface around J-groove welds after laser ultrasonic testing (LUT) as the remote inspection, and we peened the outer surface and the weld for Ikata Unit 2 supplementary. For core deluge line nozzles and primary water inlet nozzles, we peened the inner surface of the dissimilar metal welding, which is of nickel base alloy, joining a safe end and a low alloy metal nozzle. In this paper, the development and the actual application of the laser peening system for PWR power plants will be described.

• IEMEK Journal of Embedded Systems and Applications
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• v.8 no.4
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• pp.213-218
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• 2013

In this research, we report on the development of simulation system for performance verification of BMS(Battery Management System) which is utilized in electric vehicles. In the industrial circles, a manufacturer of BMS typically tests their system with real battery packs. However, it takes a long time to test all functions of BMS. Here, we develop BMU(Battery Managament Unit) as an embedded board, which will be installed in electric vehicle for controlling battery packs. All other environment factors for testing BMU are developed in softwares in order to reduce the term of test. Especially, the proposed system consists of cell simulator and CMU(Cell Management Unit) simulator which simulate real battery cells and control battery cells. These simulators enable the BMU to test more battery cells. In addition, proposed system provides diagnosis program in order to diagnose and monitor the condition of BMS which makes the test of BMS more easily. In order to verify the performance of the developed simulator, we have performed the experiment with real battery packs and our simulator. Through comparing two results of experiments, we verify that developed simulator shows better performance in terms of less amount of testing duration though having high reliability.