• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.2
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• pp.349-354
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• 2015

This paper is about utilizing magnetic sensor to measure magnetic signal and analyze the form of magnetic signal for vehicle detection. For magnetic sensor, MR sensor from Honeywell company was used, and Helmholtz coil of which 3 axis' length is 1.2 m was manufactured to check the capability of the sensor and estimate its ability to detect the magnetic field. Vehicle detection was performed in following steps: installing sensor in road lane and non-road lane; estimating magnetic field when the vehicle is run by the driver; and estimating magnetic field of 7 different vehicles with different sizes. Also, sensor was installed at SUV and small-sized vehicle's park and non-park area to analyze the form of magnetic field. Lastly, the form of magnetic field made by different parts of the vehicle was analyzed. Based on the analysis, the form of magnetic field's magnetic peak value was bigger for road lane than non-road lane, complicated form was useful to distinguish the road lane above the installed sensor and the location of the running car, and the types of vehicle could be sorted because the variance of the magnetic field was bigger for bigger size of the vehicle. Also, it was confirmed that the forms of vehicle in parts-by-parts estimates.

• 전기의세계
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• v.43 no.6
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• pp.19-26
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• 1994

본 고에서는 고속철도에 사용된 자기진단기술의 특성 및 요소기술을 설명하고 프랑스 TGV의 차량용 On board 자기진단시스템의 기능과 열차제어 및 신호시스템에 적용된 자기진단 기능을 소개함으로써 관련 기술의 이해를 돕고자 한다.

• 한국ITS학회:학술대회논문집
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• 2008.11a
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• pp.103-108
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• 2008

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.7A
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• pp.554-561
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• 2009

In this paper, we propose a novel Vehicular Ad-hoc Network(VANET) which includes communication and ranging features, using Spread Spectrum(SS) multi-carrier modulation scheme. In existing methods, a spread spectrum technique was used to communicate with other vehicles and raging was possible by detecting phase difference between transmission/reception of the PN signal. However, the use of high-speed PN signals is mandatory to detect possible errors of phase difference and to increase the analysis capacity. In the proposed system, multi-carrier modulation scheme was used as solution of mentioned problem. The multi-carrier modulation scheme uses smaller PN signal and chip-rate than the single-carrier modulation, so it is possible to send multiple carrier waves using the same frequency range. This technique (multiple carrier waves) allows to have the Equal Gain Combing (EGC) diversity effect, providing better result in phase difference error detection and raging accuracy.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.245-249
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• 2010

Now normally using a contact method of vehicle Inhibitor Switch that is use direct voltage level signal. This method is good solution for signal deliverly. but The contacted method have a short lifetime because of deterioration of contact surface. so we suggest to non-contacted method using magnetic sensor. The magnetic sensor is used to non-contacted method that is solution for problem of contacted method. In this paper using that of magnetic sensor feature, so we applied to Vehicle Transmitter switch that of non-contacting method. Sensor voltage outputs have variable electric potential that normally 0 mV to 150 mV, and it is depend on Switch Angle. we used two differential sin wave for switching of 5 state signal.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.178-178
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• 2018

차량용 강우센서는 강우에 따라 와이퍼의 동작 속도를 제어하기 위해 만들어졌다. 따라서 강수의 크고 적음을 대략적으로 판단하여 와이퍼의 속도단계를 결정하기 위한 장치이다. 차량용 강우 센서는 동작원리는 송수신되는 광신호에 기반한다. 일반적인 강우관측기와 달리 물 입자가 커질수록 빛의 산란이 크게 일어나는 현상을 이용한다. 산란이 크게 일어나면 강우 센서에 수광부의 광신호 값이 줄고 이는 강수가 높다는 것을 의미한다. 따라서 센서의 감지신호(Signal)와 실제강우(R)과의 관계를 이용하여 강우량으로 환산할 수 있는 R-S관계식을 개발하였다. 센서의 감지 신호(Signal)를 강우량으로 환산하기 위하여 실내 강우발생 실험 장치를 이용하여 일정 강우(R)를 증가시키고 그때 발생된 센서 감지량(S)의 관계를 수치적으로 분석하여 상관식을 만들었으며 실제 AWS, 자기우량계와 비교 분석하였다.

• Journal of Korean Society of Transportation
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• v.27 no.1
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• pp.179-190
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• 2009

Travel time is one of the most important traffic parameters to evaluate operational performance of freeways. A variety of methods have been proposed to estimate travel times. One feasible solution to estimating travel times is to utilize existing loop detector-based infrastructure since the loops are the most widely deployed detection system in the world. This study proposed a new approach to estimate travel times for freeways. Inductive vehicle signatures extracted from the loop detectors were used to match vehicles from upstream and downstream stations. Ground-truthing was also conducted to systematically evaluate the performance of the proposed algorithm by recognizing individual vehicles captured by video cameras placed at upstream and downstream detection stations. A lexicographic optimization method vehicle reidentification algorithm was developed. Vehicle features representing the characteristics of individual vehicles such as vehicle length and interpolations extracted from the signature were used as inputs of the algorithm. Parameters associated with the signature matching algorithm were calibrated in terms of maximizing correct matching rates. It is expected that the algorithm would be a useful method to estimate freeway link travel times.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.793-795
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• 2008

최근 유비쿼터스 컴퓨팅과 유비쿼터스 네트워크를 활용하여 새로운 서비스들을 개발하려는 노력이 진행 중이며, 이에 관련된 기술의 중요성도 급증하고 있다. 특히 감시정찰 센서네트워크의 핵심 구성요소인 저가의 경량 센서노드에서 측정한 미가공 데이터(raw data)를 사용하여 침입 물체의 실시간 탐지, 식별, 추적 및 예측하기 위한 디지털 신호처리 기술은 주요 기술 중 하나이다. 본 논문에서는 감시정찰 센서네트워크의 핵심 구성요소인 자기 센서노드에서 측정한 자기 미가공 데이터를 사용하여 사람과 차량을 탐지할 수 있는 자기 센서 디지털 신호처리 알고리즘을 설계한다. 알고리즘의 주 목표는 감시정찰용 센서노드의 탐지 신뢰성을 높이기 위한 높은 침입물체 탐지 성공률(success rate)과 낮은 허위신고(false alarm) 횟수를 가지는 것이다.

• Proceedings of the KIPE Conference
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• 2017.11a
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• pp.67-69
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• 2017

본 논문에서는 철도차량용 매입형 영구자석 동기전동기의 저속영역에서 구동을 위해 센서리스 제어 기법을 적용하였다. 저속영역에서 센서리스 제어는 회전하는 전동기에 연속적인 고주파 신호를 인가하고 그 신호에 대한 응답을 이용한다. 매입형 영구자석 동기전동기의 회전자 인덕턴스 변화와 자기적 돌극성을 이용하므로 특정 전동기에 대해 우수한 성능을 나타낸다. 따라서 본 논문에서는 동기좌표계 d축 전압에 정현파 신호와 구형파 신호를 주입하여 두 방식에 대한 결과를 시뮬레이션을 통해 분석하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.10
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• pp.4739-4746
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• 2013

In position detection for super speed maglev propulsion control, the influence of position signal delay and transmit cycle on propulsion power degradation is investigated analytically and validated by test bed experiments. As a solution to the problem caused by signal transmit, position signal compensation and estimation method is proposed and applied to the test bed. Through experiments, it is confirmed that by adapting the proposed method, the propulsion power is increased remarkably, which results in acceleration and velocity performance improvement. This method could be effectively applied to position detection system of Korean super speed maglev which is under development.