• 전기학회논문지
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• 제62권12호
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• pp.1813-1819
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• 2013

Existing level crossing obstacle detecting system was installed using a laser beam. Level crossing obstacle detecting system using a laser beam that has been a problem in relation to safety and maintainability failure according to weather conditions. We proposed laser radar level crossing obstacle detecting system as a way to overcome problem, and we developed an algorithm for this. Level crossing obstacle detecting system using a laser radar sensor algorithm is robust to external environment and a shadow zone does not exist. Sensor part of the laser radar level crossing obstacle detecting system of these is made up by the image processing unit and laser radar sensor, it operations by receiving train entering information from the control unit. In this paper, we proposed a detecting algorithm with calculation of the size of the laser radar sensor. Based on this, we were performance test on the basis of the scenario by making a prototype. In the future, laser radar level crossing obstacle detecting system to ensure the safety and reliability through the field test.

• The Journal of Korean Physical Therapy
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• 제27권2호
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• pp.112-117
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• 2015

Purpose: The purpose of this study was to examine the effects of a task-specific obstacle crossing rehabilitation program on functional gait ability in patients with cerebellar ataxia. Overall, we sought to provide ataxia-specific locomotor rehabilitation guidelines for use in clinical practice based on quantitative evidence using relevant analysis of gait kinematics including valid clinical tests. Methods: Patients with cerebellar disease (n=13) participated in obstacle crossing training focusing on maintenance of dynamic balance and posture, stable transferring of body weight, and production of coordinated limb movements for 8 weeks, 2 times per week, 90 minutes per session. Throughout the training of body weight transfer, the instructions emphasized conscious perception and control of the center of body stability, trunk and limb alignment, and stepping kinematics during the practice of each walking phase. Results: According to the results, compared with pre-training data, foot clearance, pre-&post-obstacle distance, delay time, and total obstacle crossing time were increased after intervention. In addition, body COM measures indicated that body sway and movement variability, therefore posture stability during obstacle crossing, showed improvement after training. Based on these results, body sway was reduced and stepping pattern became more consistent during obstacle crossing gait after participation in patients with cerebellar ataxia. Conclusion: Findings of this study suggest that task-relevant obstacle crossing training may have a beneficial effect on recovery of functional gait ability in patients with cerebellar disease.

• Geomechanics and Engineering
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• 제20권2호
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• pp.103-112
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• 2020

The dynamic response of crossing tunnels under heavy-haul train loads is still not fully understood. In this study, based on the case of a high-speed tunnel underneath an existing heavy-haul railway tunnel, a model experiment was performed to research the dynamic response characteristics of crossing tunnels. It is found that the under-crossing changes the dynamic response of the existing tunnel and surrounding rock. The acceleration response of the existing tunnel enhances, and the dynamic stress of rock mass between crossing tunnels decreases after the excavation. Both tunneling and the excitation of heavy-haul train loads stretch the tunnel base, and the maximum tensile strain is 18.35 µε in this model test. Then, the measured results were validated by numerical simulation. Also, a parametric study was performed to discuss the influence of the relative position between crossing tunnels and the advanced support on the dynamic behavior of the existing tunnel, where an amplifying coefficient of tunnel vibration was introduced to describe the change in acceleration due to tunneling. These results reveal the dynamic amplifying phenomenon of the existing tunnel during the new tunnel construction, which can be referred in the dynamic design of crossing tunnels.

• 대한교통학회지
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• 제27권1호
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• pp.83-95
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• 2009

철도 건널목은 구조상 궤도와 도로가 물리적으로 만나는 공간으로 사고위험도가 매우 높다. 궤도와 도로가 물리적으로 만나는 공간이므로 철도 건널목의 안전 기준은 철도관련 법령과 도로관련 법령에 각각 제시되고 있다. 철도 관련 법령으로는 '건널목 개량촉진법', '건널목 개량촉진법시행령', '철도건설규칙', '철도시설 안전기준에 관한 규칙', '삭도 궤도법시행규칙'이 있고 도로 관련 법령으로 '도로교통법', '도로교통법 시행규칙', '도로의 구조 시설 기준에 관한 규칙', '농어촌 도로의 구조 시설 기준에 관한 규칙', '자전거 이용 시설의 구조 시설 기준에 관한 규칙'등이 있다. 그러나 이러한 법령들은 서로 상충되는 내용이 있었으며, 현재 추가 설치 운영되고 있는 안전설비에 대한 내용은 포함되지 않고 있었다. 이에 본 연구에서는 사고 위험도를 줄이기 위해 기존의 안전기준을 보완한 새로운 안전기준을 제안한다.

• 한국ITS학회 논문지
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• 제7권5호
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• pp.77-89
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• 2008

자전거도로가 설치된 교차로 빛 횡단도로에서 자전거, 차량 및 보행자 간에 상충이 발생하게 된다. 이와 같이 자전거 도로와 여타 교통류가 교차되는 구간에서 자전거와 자동차, 자전거와 보행자와의 상충을 분리해주어야 하는데, 이런 방법 중 하나가 자전거전용신호라고 할 수 있다 자전거도로 시설 및 이용자 특성조사에 따르면 자전거도로가 횡단보도와 연 계하여 설치되어 있고, 자전거이용자 대부분이 횡단보도신호를 이용하고 있으며, 횡단보도시간 내에 횡단을 종료하는 것으로 조사되었다. 따라서 횡단보도와 자전거도로가 인접된 자전거횡단도로에서는 보행신호등과 연계한 운영방안 즉, 영국의 TOUCAN Crossing 형태의 적용이 제안된다. 이와 같은 자전거전용신호 운영체계는 현재 자전거횡단도로의 위치가 횡단보도와 인접하여 설치되어 있고, 대부분의 자전거이용자들이 보행신호에 따라 도로를 횡단하고 있으며, 보행선호시간동안 횡단할 수 있기 때문이다. 반면에 자전거횡단도로가 보행도로와 이격되어 설치된 경우 및 자전거의 통행속도 등을 고려하여 전용도로 형태로 자전거도로가 설치된 경우에는 차량신호와 연계한 자전거신호등 형태 (3색 등화체계)가 제안된다. 이와 같은 자전거신호등의 운영형태는 기존 자전거도로 시설과 자전거이용자의 도로횡단특성을 수용하고, 교통 신호제어기의 기능변경 없이 신호시간의 조정만으로 적용이 가능한 이점이 있다.

• 대한교통학회지
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• 제13권2호
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• pp.43-58
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• 1995

This paper discusses some of the results of investigation of railroad-highway grade crossing accidents and accident-related inventory information that was collected from the Pusan District Office of the Korean National Railroads. Established statistical techniques were applied to tabulated data to obtain an accident prediction equation that estimates the expected probability of accidents at each crossing under various grade crossing situations. It was found that the most significant factor that influences the railroad crossing accidents was flagger. The other factors were train and traffic volumes, number of tracks. crossing angle, maximum timetable train speed, algebraic grade difference, and lighting facility. No significant effects was identified with railroad crossing gates. The results of the analysis and the uses of the prediction equation for the development of warrants for safety improvements are also discussed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.175-177
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• 2008

The level crossing collision accident which comprises more than 90 percent of all level crossing accidents is one of the most serious safety problems. There is a critical need for providing safe strategy and is focusing on the level crossing information rather than measures at a grade crossing. This study is intended to develop technology for accident prevention and damage reduction based on accident cases analysis result and improvement direction to complement shortcomings of safety equipment of conventional level crossing and to establish safety of travelers(train, motor vehicle, person).

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.88-91
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• 2007

Turnout system is a mechanical installation enabling trains to be guided from one track to another which is consists of point blades, common crossing and guard rail etc. These structural feature causes vibration, noise and damages while railroad car wheel is passes by. A tilting train is a train with a tilting mechanism that enables increased speed on regular railroad tracks. The aim of this paper is to study a characteristics of the shock-vibration and noise of tilting and existing train passes by turnout systems. To analyze and assesment, noise and vibration measurement was carried out at the Naesu-station of Chungbuk-line which equipped with cast manganese crossing and built-up crossing and Illo-station of Honam-line which equipped with cast manganese crossing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1197_1198
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• 2009

The development of Technology study for preventing of accident and reducing the risk through the intelligence of level crossing is provide the detection of stopped car at railway crossing with the most advanced intelligence technology such as sensor, computer, communication and date processing and transmit to the operational staff on broad for reaction or make the train stopped automatically through the connection with train. Also this study include that showing the situation of crossing railway when the train is approached and prevent the accident and reduce the risk through the connection of road transit signal system. On this study is performed the test through the date from spot level crossing and the development of video detection algorism for stopped road transit vehicle at level crossing with intelligent system.

• 한국작물학회지
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• 제38권6호
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• pp.495-508
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• 1993

연초 종자생산의 기초자료를 얻기 위하여 임성품종과 웅성불임 품종을 공시하여 격리거리 및 이식시기에 따른 자연교잡율을 조사하였다. 1. 임성품종간의 인접재배시 자연교잡율은 평균 1.6%이었고 0.9～2.5%범위로 나타났다. 2. 임성품종과 웅성불임 게통의 인접재배시 자연교잡율은 29%로 임성품종에 비하여 현저히 높게 나타났다. 3. 이식시기따른 자연교잡율은 4월20일 이식한 처리구가 5월 5일 및 5월20일 이식한 처리구보다 현저히 높았다. 4. 격리거리에 따른 자연교잡율은 격리거리가 멀수록 낮았고 300m 격리구에서도 자연교잡이 0.8%로 나타났다.