• 전기의세계
• /
• v.42 no.9
• /
• pp.12-19
• /
• 1993

재래식 철바퀴 철도에서는 바퀴가 레일을 단락시킴으로써 열차의 위치를 알아낼 수 있으나 자기부상식 철도나 고무타이어식 철도에서는 이런 단락회로를 얻을 수 없기 때문에 공간적으로 분리된 유도무선식에 의한 위치검지가 채택되고 있다. 유도무선방식에 의한 열차위치검지는 자기부상식이나 고무타이어식 철토에서만이 이용되는 것이 아니라 열차의 보다 정밀한 위치정보를 얻기 위하여 철바퀴식 철도에서도 사용될 수 있는 범용적인 위치검지방식이다. 따라서 이 방식에 대한 연구가 지속되어 재래식 철도와 자기부상식 철도에서 공통으로 사용될 수 있는 신호시스템으로 개발되기를 바란다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.8
• /
• pp.5534-5540
• /
• 2015

This In the railway signaling system, applications of axle counter in addition to track circuit goes on increasing for detecting train position. Consequently, this paper compares sensor methods of axle counter with between geo-magnetism method and proximity sensor method. And it presents differences and results, to improve reliabilities of train detection and axle counting. Also, this article presents an applied result which is based on field experience, with regard to installation, considering attachment condition of sensor part for accurate axle counting. This study acquires expandability that is able to perform not only axle counting function but also various other functions (direction detection of train, speed detection of train, and so on). It was a result of a change of design in order to judge phase difference of sensors, to improve reliability of axle counting. Furthermore, it does not subordinate to characteristics (type, weight of train). And it is confirmed that the omission of axle counting was not occurred in 350km/h. This was the result of Lab test after the construction of transfer equipment of trial axle and Test Bed for axle counting. Both of them are self-productions. Through this, it prepares foundation which is able to apply not only to train detection but also to speed of passing trains, formation number of trains, detector locking condition - when the train passes the section of switch point, and level crossing devices. Furthermore, it would be judged to contribute safety train operation if proximity sensor method applies to the whole railway signaling system from now on.

• Proceedings of the KSR Conference
• /
• 2006.11b
• /
• pp.802-810
• /
• 2006

For a thorough train control, the precise train position detection is necessarily required. The widely used current way for train position detection is the one of using track circuits. The track circuit has a simple structure, and has a high level of reliability. However trains can be detected only on track circuits, which have to be installed on all ground sections, and much amount of cost for its installation and maintenance is needed. In addition, for the track circuit, only discontinuous position detection is possible because of the features of the closed circuit loop configuration. As the recent advances in telecommunication technologies and high-tech vehicle-based control equipments, for the train position detection, the method to detect positions directly from on trains is being studied. Vehicle-based position detection method is to estimate train positions, speed, timing data continuously, and to use them as the control information. In this paper, the features of GPS navigation and DR navigation are analyzed, and the navigation filters are designed by constructing vehicle-based train position detection method by combining GPS navigation and DR navigation for their complementary cooperation, and by using kalman filter. The position estimation performance of the proposed method is also confirmed by simulations.

• Nuclear industry
• /
• v.5 no.11 s.33
• /
• pp.66-70
• /
• 1985

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.11 no.5
• /
• pp.125-135
• /
• 2012

This paper proposes the new object detection system with two laser-scanners and a camera for classifying the objects and predicting the location of objects on road street. This detection system could be applied the new C-ITS service such as ADAS(Advanced Driver Assist System) or (semi-)automatic vehicle guidance services using object's types and precise position. This study describes the some examples in other countries and feasibility of object detection system based on a camera and two laser-scanners. This study has developed the heterogenous sensor's fusion method and shows the results of implementation at road environments. As a results, object detection system at roadside infrastructure is a useful method that aims at reliable classification and positioning of road objects, such as a vehicle, a pedestrian, and obstacles in a street. The algorithm of this paper is performed at ideal condition, so it need to implement at various condition such as light brightness and weather condition. This paper should help better object detection and development of new methods at improved C-ITS environment.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.15 no.6
• /
• pp.150-158
• /
• 2016

This paper is on a design of a new balise system which has a new functional part of a micro-power inductive wireless loop vehicle detector. The field test has processed and the data has analyzed for check the solar energy operable ability of the detect data interconnect sub-system which includes repeaters and field controllers. Instead of a railroad environment, 12 individual parking-lots are used for field test environment. As a result, in the condition of the designed system and the test environment, it is assumed that under 200 passing vehicles(train or tram) per day can be processed only with solar energy.

• Journal of Korean Society of Transportation
• /
• v.22 no.4 s.75
• /
• pp.159-173
• /
• 2004

This study utilizes the fuzzy logic and genetic algorithm to improve the existing incident detection models by addressing the problems associated with "crisp" thresholds and model transferability (applicability). The model's major components were designed to be a set of the fuzzy inference engines, and for the self-adaptation capability the genetic algorithm was introduced in optimization(or training) of the fuzzy membership functions. This approach is often called "the hybrid of fuzzy-genetic algorithm" The model performance was tested and found to be compatible with that of the existing well-recognized models in terms of performance measures such as detection rate, false alarm rate, and detection time. This study was not an effort for simple improvement of the model performance, but an experimental attempt to incorporate new characteristics essential for the incident detection model to be universally applicable for various roadway and traffic conditions. The study results prove that the initial objective of the study was satisfied, and suggest a direction that the future research work in this area must follow.

• Journal of Korean Society of Transportation
• /
• v.23 no.5 s.83
• /
• pp.105-112
• /
• 2005

This paper not only tests VIDS(Video Image Detection System) performance by vehicle speed group but also suggests optimal VIDS height considering road and cost condition. The VIDS spreads over freeway and national highway and plays an important role in ITS(Intelligent Transportation Systems). As a result, speed data accuracy drops form 50kph vehicle speed and volume and occupancy data accuracy drop from 30kph. Lowest speed data accuracy is only 88%, but volume and occupancy accuracy are 75% and 77% respectively. The reason VIDS data accuracy drop by vehicle speed is gap distance decrease between vehicles. Therefore, this paper suggests $17m{\sim}21m$ for optimal VIDS height considering road and cost condition.

• Journal of Korean Society of Transportation
• /
• v.19 no.4
• /
• pp.109-121
• /
• 2001

본 연구는 공간적 정보를 수집할 수 있는 영상검지기를 이용하여 주어진 대기행렬길이를 기반으로 하는 최적주기 알고리즘을 개발함으로써 교통신호 제어에 대한 새로운 신호계획을 제공한다. 본 연구에서는 교통수요의 공간적인 정보를 획득하는 방안으로서 영상검지기 기반의 대기행렬길이를 사용한다. 전략적 측면에서 다양한 교통상태를 적용하였으며, 주요 결과는 아래와 같다. 1. 영상검지기 기반의 대기행렬길이 계산방안을 제안한다. 이 방법은 한 링크의 상류부와 하류부에 2대의 영상검지기를 설치하여 대기행렬길이를 산출하는 방안이다. 2. 신호제어 변수인 주기 계산모형이 개발된다. 이 방법 역시 영상검지기를 기반으로 하는 대기행렬길이를 사용한다.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.1242-1243
• /
• 2011

차량 검지 시스템은 실시간으로 교통상황 자료를 수집하는 시스템으로, 관리대상 구간의 자료를 수집하여 시시각각 변하는 교통상황에 대한 효과적인 교통관리를 수행하도록 한다. 현재 차량 검지 시스템은 상당한 안정성과 정확성을 확보 하고 있기는 하나, 시스템 구성시 검지 시스템 자체의 구성에 드는 비용과 시간 보다는 센터와의 통신에 필요한 시스템 구축이나 전원 확보를 위한 전원선 공사등과 같은 주변 환경 요건 구축에 더욱 많은 비용과 시간이 드는 문제점이 있다. 이는 정보수집의 방식이 현재까지는 센터와 1:1 연결을 통한 정보교환에 의한 것이어서 전국단위의 N개 총신회선의 정보교환을 위해서는 1:N개의 통신회선이 필요하기 때문이다. 따라서 본 논문에서는 이러한 문제점 해결을 위한 레이더 차량 검지 시스템용 통합 프로토콜 제어기의 개발을 수행한다.