• 한국도로학회지:도로
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• v.19 no.4
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• pp.66-75
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• 2017

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.1037-1038
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• 2010

• 한국도로학회:학술대회논문집
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• 2003.10a
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• pp.35-40
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• 2003

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1537-1538
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• 2011

• International Journal of Highway Engineering
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• v.4 no.1 s.11
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• pp.161-170
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• 2002

This study is a fundamental research for recycling waste polyethylene film(WPF) in asphalt concrete for roadway pavement. The objective of this study is to develop technology of making waste polyethylene asphalt mixture and evaluate properties of the asphalt concrete containing WPF. Asphalt concrete for surface course of pavement was produced through an appropriate mix-design using dense-graded and gap-graded aggregates. Marshall mix design, indirect tensile strength test, wheel tracking test and tensile fatigue test were performed. Test result showed that some WPF asphalt mixtures had a high tensile property and good resistances against rutting and fatigue cracking, compared with normal asphalt mixture.

• Aerospace Engineering and Technology
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• v.1 no.1
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• pp.28-41
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• 2002

The purpose of this paper is to show and define the performance, the system mechanization and the algorithm of the Strapdown Inertial Navigation System(SDINS). First, navigation equations are derived in the Earth Fixed mechanization and this mechanization apply to the two kinds of inertial measurement units which consist of same fiber optic gyros and different accelerometers(SDINS-1 and SDINS-2). Those two accelerometers have the different bias. To evaluate its performance, two kinds of tests have been performed - static motionless test, and rectangle-route moving test. The results of the moving test are compared with the results of Differential GPS which has an accuracy with ±2.0mm. and are presented in this paper.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2373-2375
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• 2002

전자 제어식 미끄럼 방지 제동 장치(ABS, Anti-lock Brake System)를 장착한 차량의 실차 제동 시험은 시험용 차량을 비롯하여, 많은 분석장비를 필요로 한다. 이러한 고가의 장비는 구하기가 어려울 뿐만 아니라 사용방법을 학습하는 데에도 상당한 기간을 필요로 하므로, 개발중인 ABS에 대하여 적용해 보기에는 그 사용에 제약을 받는다. 본 논문에서는 개발중인 미끄럼방지 제동 알고리즘과 전자제어장치(ECU, Electronic Control Unit)를 대형 버스에 장착하여, 저 점착 노면에서 주행 시험을 시행하였고, 그 주행 기록의 분석을 위하여 DAS(Data Acquisition System)를 구현하였다. 개발 ABS 알고리즘 및 ECU의 기능과 성능 검증이 목적인 DAS는 부가적인 센서 및 고가의 장비를 사용하지 않고 제어보드와 휴대용 노트북 컴퓨터를 이용하였다. 고정밀도의 자료를 획득할 수는 없었지만, 개발 DAS를 이용한 차량 실차 제동 시험은 경제적이면서도 효과적인 ECU 및 알고리즘의 성능 분석을 이룰 수 있었다. 특히 개발 DAS는 제어 및 Data Acquisition을 동일한 보드를 사용하여 구현함으로써, ABS 장착 실차 주행 시험 결과를 제어알고리즘에 즉각적으로 반영시킨 수 있었다. 이러한 One Board System 및 On-Vehicle Programming을 이용한 방법은 개발 알고리즘의 빠른 Debugging 및 파라미터 조정(Tuning)을 가능하게 하였으므로, 실차 제동 시험을 위한 한정된 기간 내에 개발 ABS ECU 및 제어 알고리즘의 성능을 효과적으로 검증할 수 있었다.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.6
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• pp.491-499
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• 1999

This paper is on the high perfonnance propulsion IGBT VVVF inverter adopted new technique for railways. To prove the high performance and stabilit~r of traction, running tests are carried out under the simulated condition alike real field. The tests are perfonned on not only a steady states but also a transient states such a as input voltage variation using inertia load equivalent to 160tons train. The vector control technique is a adopted to improve traction for 4 motors. The low switching synchronous PW1\l method based on a space v voltage vector modulation is pro\XlSed as the optimal method for propulsion system railway. The output voltage l is controlled continuously to six step by prolxlsed ovennodu]ation technique without sudden torque variation.

• Journal of the Korean Society for Railway
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• v.13 no.2
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• pp.208-213
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• 2010

This paper describes the instruments used, and the test procedures adopted, and the findings obtained from a research project aiming to investigate, via full-scale field tests, the ground borne vibration caused by underground railway tunnel constructed in hard rock. The ground borne vibration induced by high-speed trains (i.e. the Korea Train eXpress (KTX) services) with a speed of approximately 200km/hr was measured inside the borehole constructed in the close proximity to the KTX tunnel using 3-component borehole seismographs in order to investigate the wave propagation of ground borne vibration. This paper also discusses the limitation associated with the current practice of measuring ground borne vibration using conventional borehole seismograph.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.6
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• pp.43-49
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• 2022

FMCW(Frequency Modulated Continuous Wave) Radar is very useful for vehicle collision warning system and autonomous driving sensor. In this paper, the design and implementation of FMCW radar based on two chip MMIC developed as an autonomous driving sensor was described. Especially, generation of frame-based and chirp-based waveform generation and signal processing are mixed to have the strength of maximum detection speed and compensation of speed. This implemented system was analyzed for performance and commercialization potential through lab. test and driving test in K-city.