• The Journal of the Korea Contents Association
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• v.17 no.11
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• pp.303-311
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• 2017

Safety accidents in railway work continue to increase every year; Engineer's negligence, trackside worker's sensory deprivation and signalman's mistake are the main reasons of such incidents. We consider this problem by far the most urgent matter in railway work because of its steady increase and risk of taking a person's life. Based on that account, a new alarm system has developed, that is called Railway Access Alarm System, to allow railway workers to sense the access of trains with not only vision, but also hearing. The detector device of this system is installed on both sides of the track locating 1.5km from the workplace. When the train enters the place, the detector device can sense the entering, sending the detect sign of train to the alarm unit, then the alarm unit warns the workers by the LED lighting and sirens. This system has several advantages compared to previous systems. First, it recognizes the train at a long distance. Secondly, there is no need for wiring work since it is a wireless system. At last, the system works by rechargeable batteries and solar charger so that it is installed in the work places where there is no external power supply. Moreover, it is proven that the system is 100% reliable by the successful on-the spot inspection evaluating the capability.

• Journal of Korean Society of Transportation
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• v.27 no.5
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• pp.97-111
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• 2009

Image-based traffic information collection systems have entered widespread adoption and use in many countries since these systems are not only capable of replacing existing loop-based detectors which have limitations in management and administration, but are also capable of providing and managing a wide variety of traffic related information. In addition, these systems are expanding rapidly in terms of purpose and scope of use. Currently, the utilization of image processing technology in the field of traffic accident management is limited to installing surveillance cameras on locations where traffic accidents are expected to occur and digitalizing of recorded data. Accurately recording the sequence of situations around a traffic accident in a signal intersection and then objectively and clearly analyzing how such accident occurred is more urgent and important than anything else in resolving a traffic accident. Therefore, in this research, we intend to present a technology capable of overcoming problems in which advanced existing technologies exhibited limitations in handling real-time due to large data capacity such as object separation of vehicles and tracking, which pose difficulties due to environmental diversities and changes at a signal intersection with complex traffic situations, as pointed out by many past researches while presenting and implementing an active and environmentally adaptive methodology capable of effectively reducing false detection situations which frequently occur even with the Gaussian complex model analytical method which has been considered the best among well-known environmental obstacle reduction methods. To prove that the technology developed by this research has performance advantage over existing automatic traffic accident recording systems, a test was performed by entering image data from an actually operating crossroad online in real-time. The test results were compared with the performance of other existing technologies.

• Korean Journal of Food Science and Technology
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• v.36 no.2
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• pp.345-348
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• 2004

Dried cabbage, spinach, carrot, mugwort and yam were irradiated at 1, 5 and 10 kGy using a $^{60}Co$ irradiator at room temperature. Effects of irradiation dose and storage time on irradiated dried vegetables were investigated through electron spin resonance (ESR) spectroscopy. Strong positive correlation coefficients ($R^{2}=0.9698-0.9915$) were obtained between irradiation dose and corresponding ESR signal intensity. ESR signal of mugwort was most stable at 9 weeks storage, followed by carrot, yam, and spinach, whereas that ESR signal of cabbage was not distinguishable.

• Korean Journal of Food Science and Technology
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• v.34 no.1
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• pp.18-23
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• 2002

The detection characteristics of gamma-irradiated $(0{\sim}4\;kGy)$ soybeans produced in Korea and China were investigated by thermoluminescene (TL), electron spin resonance (ESR), and DNA comet assay. The TL glow curves were shown at around $200^{\circ}C$ for irradiated soybeans, while that at $280^{\circ}C$ for the non-irradiated one. The normalization with a re-irradiation step at 1 kGy could verify the above detection results. The Korean soybean showed higher glow curves than Chinese did. The ESR spectroscopy for husks of irradiated soybeans revealed specific signals (g = 2.02374, 1.98715) derived from cellulose radical, which intensities were proportional to irradiation does, with the higher peaks in Chinese sample than Korean one. The DNA comet for the non-irradiated sample showed no or little tails, while those for irradiated samples above 0.5 kGy were remarkably changed in their length, size, and concentration, thus resulting in distinguishing non-irradiated from irradiated samples. As a result, TL, ESR, and DNA comet determinations were found suitable for the detection of irradiated soybean at 0.5 kGy or more, and negligible differences were observed between Korean and Chinese origins in their detection characteristics.

• Journal of Radiation Industry
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• v.2 no.1
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• pp.27-34
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• 2008

Photostimulated luminescence (PSL), electron spin resonance (ESR) and thermoluminescence (TL) analyses were conducted to detect whether 258 kinds of extracted and powdered forms food additives were irradiated or not. In a view of the PSL results, 9 kinds of the extracted and powdered samples (3.2%) showed over 5,000 photon counts $(60sec)^{-1}$ and these samples were judged to be irradiation-positive. Thirty nine kinds of the samples (15.6%) yielded 700~5,000 photon counts $(60sec)^{-1}$ and these samples were grouped into irradiation-potential, while the samples showed below 700 photon counts $(60sec)^{-1}$ sec were judged to be irradiation-negative. TL glow curves for minerals separated from 5 samples were detected at $150^{\circ}C$ with high intensity. However, TL analysis did not apply to other irradiation-positive and irradiation-potential samples because the minerals for TL detection were not separated from the samples. ESR measurements for irradiation-positive and irradiation-potential samples, judged by PSL detection, showed no specific signals to irradiation. The results indicated that PSL could be applied to identify irradiation treatment of extracted and powdered food additives, while TL was optional and ESR was not suitable for detection extracted and powdered food additives.

• 한국IT서비스학회:학술대회논문집
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• 2008.11a
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• pp.411-414
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• 2008

해상사고로 인한 송전선로의 보호를 위해 Scan Laser Range Finder를 사용하여 해상에서의 일정한 높이에서 수평으로 레이저빔을 조사한 후 높이 기준을 넘는 선박을 검지하여 좌표와 속도를 측정하여 경보방송 및 무선 통신으로 회항을 유도하여 송전선을 감시 및 보호하는 기술개발로 산업 현장에서의 적응력을 높이는데 기여할수 있을것으로 보인다.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.229-231
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• 2005

현재 철도 신호시스템 추세는 이동폐색 및 무인운전, 안전에 주안점을 두어 연구개발 되고 있다. 본 논문에서는 철도환경에 적합하고 경제성이 고려된 무선에 의한 새로운 열차검지기법인 토대로 이동폐색을 구현 및 평가하기 위하여 적용한 방법에 대하여 기술하고자 한다. 시험선에서 1편성의 열차 조건으로 이동폐색을 검증하기 위하여 선두열차를 모형열차(Dummy Train)로 시스템을 구성하여 정적인 상태에서 평가를 통해 검증하였다.

• Proceedings of the KIEE Conference
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• summer
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• pp.1454-1456
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• 2004

전기선로전환기는 분기기에 전환력을 공급하기 위한 장치로 전기선로전환기의 선택은 분기기에 연결되는 간류 구조, 침목, 밀착 쇄정기, 밀착 검지기, 연결간 및 벨 크랭크 등에 따른 제약 사항과 함께 검토된다. 본 논문에서는 현재 우리나라에서 사용 중인 전기선로전환기에 대한 특성을 분석한 후, 기존선 속도 향상 및 안전사고 예방을 위한 보안 설비의 추가적인 설치 필요성 분석 및 속도 향상을 위한 요구 사양을 분석하였다.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1366-1369
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• 2008

현재 운영 중인 대부분의 전자연동장치에서는 시스템을 이중계로 구성하고 있다. 전자연동장치 이중계 시스템은 동작계와 대기계등으로 이중으로 구성하여 시스템의 안전성을 확보하고 있다. 이중계시스템에서는 동작계 모듈의 고장 시 고장을 검지하여 대기계로 절체 하여 계속적인 연동장치의 업무를 수행할 수 있도록 하고 있다. 본 논문에서는 이러한 대기계로 절체 시 발생 할 수 있는 문제점들을 도출하고 그 문제점에 대하여 보안한 모델을 제시하고 문제점에 대한 실험을 통하여 문제점 해결에 대한 확인을 하고자 한다.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1020-1026
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• 2011

In this paper, we propose a method that measures the height and stagger of an catenary using the laser profile images. One line laser and area scanner CCD cameras are used. To quickly and accurately extract, from a photographed image, the area of the overhead line on which the line laser is shone, we consider the established fact that the catenary is the lowest among the electric wires. Here we are solving the the distance to the catenary if we know the distance the camera is from the ground and the angle of the catenary in the field of view. The angle will be related to the number of pixels in the image. This pixels per degree is a constant for the camera. Also, because of the different pixel resolution of the camera according to the overhead line position, we compensate the measurement result through camera calibration.