도시철도 시스템에서 화상처리기술 역사 적용방안

오세찬(Oh Seh-Chan),박성혁(Park Sung-Hyuk),여민우(Yeo Min-Woo) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-

Passenger safety is a primary concern of railway system but, it has been urgent issue that dozens of people are killed every year when they fall off from train platforms. Recently, advancements in IT have enabled applying vision sensors to railway environments, such as CCTV and various camera sensors. The objective of this work is to propose technical and system requirements for establishing intelligent monitoring system using camera equipments in urban transit system. We suppose the system is to determine automatically and in real-time whether anyone or anything is in monitoring area. To achieve the goal, we analyze recent image processing technologies for detection and recognition, and suggest possible direction of system development for applying urban transit system. According to the results, we expect the proposed system requirements will play a key role for establishing highly intelligent monitoring system in railway.

한국형 무선통신기반 열차제어시스템 표준체계 구축을 위한 ATP 개발사양 연구

오세찬(Oh Seh-Chan),윤용기(Yoon Yong-Ki),김용규(Kim Yong-Kyu) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10

The train control system is a facility to ensure safe train operation and its safety is the most important factor for system introduction. Therefore in order to improve practical usability in the business safety analysis and evaluation of train control system and train control related core technologies are needed. Korea Railroad Research Institute has carried out standard development of radio-based train control system as a government research and development project. In this paper we present a system specification of ATP a core part of train control system for standard system of Korean radio-based train control system(KRTCS). The paper present a operation environment and primary ATP functions and functional requirement specifications.

비전기반 철도승강장 자동감시시스템 검지성능평가

오세찬(Seh-Chan Oh),김길동(Gil-Dong Kim),정의진(Eui-Jin Joung) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6

Vision based Railroad Platform Monitoring System is a new type of safeguard which detects possible accidents on railway platform, and immediately reports detection results with alarm to the operators. Moreover, it provides automatic functions, such as automatic train stop, information broadcasting. In this paper, we presented the system configuration, detection process and the evaluation results for the system detection performance.

무선통신기반 열차간격제어를 위한 전처리 기반 속도프로파일 계산 알고리즘

오세찬(Oh, Seh-Chan),김경희(Kim, Kyung-Hee),김민수(Kim, Min-Su) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.9

무선통신기반 열차제어시스템은 차상과 지상과의 양방향 무선통신을 기반으로 실시간 열차간격제어가 가능하므로 운전시격 단축 효과가 있으며 궤도회로를 사용하지 않기 때문에 설비투자를 절감 할 수 있다. 무선통신기반 열차제어시스템 에서 가장 중요한 부분인 자동열차방호(ATP: Automatic Train Protection)는 실시간 열차위치 추적을 기반으로 선행열차와 후행열차간의 안전한 간격제어를 수행한다. 본 논문은 도시철도용 무선통신기반 열차제어시스템의 열차간격제어를 위한 전 체적인 ATP 열차간격제어 알고리즘과 ATP의 처리속도 향상을 위해 전처리 기반 속도프로파일 계산 알고리즘을 제안한다. 제안된 속도프로파일 계산 알고리즘은 사전에 선로와 열차의 영구속도제한에 해당하는 프로파일을 미리 계산하여 가장제한 적인 속도프로파일로 활용한다. 만약 운행 중 특정 노선 구간에 임시속도제한이 발생하는 경우 미리 계산된 영구속도프로파 일에 임시속도제한을 반영하여 해당 구간의 속도프로파일을 업데이트함으로써 계산효율을 높일 수 있다. 제안된 속도프로파 일 계산 알고리즘의 성능을 평가하기 위해 시간복잡도 O-notation으로 분석하였으며 그 결과 기존에 비해 시간 복잡도를 개선 할 수 있음을 확인하였다. 또한 ATP 열차간격제어 검증을 위해 열차간격제어 시뮬레이터를 제작하였으며 실험결과를 통해 다양한 운영상황에서 안전한 열차간격제어가 이루어지고 있음을 확인하였다. Radio-based train control system has driving headway shortening effect by real-time train interval control using two-way radio communication between onboard and wayside systems, and reduces facility investment because it does not require any track-circuit. Automatic train protection(ATP), the most significant part of the radio-based train control system, makes sure a safe distance between preceding and following trains, based on real-time train location tracing. In this paper, we propose the overall ATP train interval control algorithm to control the safe interval between trains, and preprocessing-based speed profile calculation algorithm to improve the processing speed of the ATP. The proposed speed profile calculation algorithm calculates the permanent speed limit for track and train in advance and uses as the most restrictive speed profile. If the temporary speed limit is generated for a particular track section, it reflects the temporary speed limit to pre-calculated speed profile and improves calculation performance by updating the speed profile for the corresponding track section. To evaluate the performance of the proposed speed profile calculation algorithm, we analyze the proposed algorithm with O-notation and we can find that it is possible to improve the time complexity than the existing one. To verify the proposed ATP train interval control algorithm, we build the train interval control simulator. The experimental results show the safe train interval control is carried out in a variety of operating conditions.

스테레오비젼기반 승강장 모니터링시스템

오세찬(Oh Seh-Chan),김길동(Kim Gil-Dong),박성혁(Park Sung-Hyuk),이한민(Lee Hanmin) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

Passenger safety is a primary concern of railway system but, it has been urgent issue that dozens of people are killed every year when they are fallen from train platforms. Recently, advancements in IT have enabled applying vision sensors to railway environments, such as CCTV and various camera sensors. In this paper we propose a stereo vision based platform monitoring system which automatically determines in real-time whether human or object is in preset monitoring area or not. The system uses stereo image processing technique employed in ITS technology to improve detection rate. This paper introduces system overview, configuration and detection process of the system. According to the results, we expect the proposed system requirements will play a key role for establishing highly intelligent monitoring system in railway.

영상처리를 이용한 철도 승강장 영역에서의 열차상태 검지방법

오세찬(Oh, Seh-Chan),윤용기(Yoon, Yongki),백종현(Baek, Jong-Hyen),조현정(Jo, Hyun-Jeong) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.12

현재 철도 역사의 승객 위험영역과 보안영역 등의 감시를 위해 수십대의 CCTV를 널리 이용하고 있다. 그 중에서 가장 빈번한 사고가 발생되는 곳은 승객의 열차 승하차가 이루어지는 승강장 영역이다. 하지만 사고 예방과 신속한 대응을 위해 역무원이 여러 대의 CCTV를 항시 모니터링 하기는 불가능하다. 따라서 위험상황을 자동으로 인지할 수 있는 영상처리 기술을 이용한 승강장 모니터링 시스템이 요구되며, 이를 위해서는 우선적으로 승강장에서 의 정확한 열차상태 판단이 필요하다. 본 논문은 비전기반 승강장 모니터링 시스템을 위한 승강장에서의 열차상태에 대한 검지방법을 제안한다. 제안된 검 지 방법은 승강장에서의 열차 점유영역을 분석하여 열차의 진입(IN), 진출(OUT), 정지(ON), 없음(OFF)의 4가지 생태 를 판별한다. 제안된 검지방법의 성능 평가을 위해 서울메트로 4호선 동작역과 남태령역을 대상으로 열차상태 검지 결과를 제시하였다. Currently, dozens of CCTVs are widely used in railway station for monitoring passengers in danger and security areas. The most frequent accidents occur at the platform area where passengers boarding the train. However, It is almost impossible that station operator monitors dozens of CCTV screens and recognizes immediately accidents and handle them. Therefore, railway platform monitoring system using image processing technology which automatically detects platform accidents is needed, and in order to that, preferentially, accurate determination of train state in the platform is required. In the paper, we propose train state detection algorithm for vision based railway platform monitoring system. the proposed algorithm determines four different states i.e. trains approach(IN), departure(OUT), stop(ON), and empty(OFF) of the train, in the platform. To evaluate the proposed algorithm, we present the train detection results for the Seoul Metro Line 4 Dongjak and Namtaeryeong Station

무선통신기반 열차제어시스템에서의 운전시격 계산과 간격제어 성능개선을 위한 열차간격제어 알고리즘

오세찬(Oh, Seh-Chan),김경희(Kim, Kyung-Hee),이성훈(Lee Seong-Hoon),김자영(Kim, Ja-Young),전종화(Quan, Zhong-Hua) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.10

무선통신기반 열차제어시스템은 관할영역 내에 운행 중인 열차의 위치정보를 지상시스템에서 실시간으로 수신하고 다시 각각의 열차의 차상시스템에 새로운 이동권한을 제공함으로써 안전한 간격제어를 수행한다. 열차제어시스템의 성능은 최소 운전시격으로 평가되며 그것은 열차제어시스템의 간격제어 성능뿐만 아니라 운영특성 그리고 열차의 특성을 반영하여 계산된다. 본 논문은 무선통신기반 열차제어시스템의 운전시격 계산과 운전시격을 개선하기 위한 새로운 열차간격제어 알고 리즘을 제안한다. 제안된 운전시격 계산 방법은 열차제어시스템 간격제어 성능을 반영한 안전마진 추정을 통해 각각 역간 운전시격과 역 운전시격을 정의한다. 또한 제안된 열차간격제어 개선 알고리즘은 간격제어 개선을 위해 거리와 속도를 포함 하는 이동권한을 새롭게 정의하며 선행열차에서 필연적으로 발생하는 제동거리를 이용함으로써 열차의 운전시격을 향상시 킬 수 있다. 제안된 운전시격 계산방법을 한국형 무선통신기반 열차제어시스템의 간격제어 성능을 대상으로 시뮬레이션을 수행하며 개선된 열차간격제어 알고리즘과 비교분석 한다. 시뮬레이션 결과에 따르면 제안된 운전시격 계산방법은 향후 무 선통신기반 열차제어시스템의 성능 지표로 활용이 가능하며 제안된 간격제어 알고리즘은 기존의 무선통신기반 열차제어시 스템의 역 운전시격과 역간 운전시격을 개선할 수 있음을 확인한다. Radio based train control system performs train safe interval control by receiving in realtime the position information of trains driving in the control area of the wayside system and providing onboard system in each train with updated movement authority. The performance of the train control system is evaluated to calculate the minimum operation headway, which reflects the operation characteristics and the characteristics of the train as well as the interval control performance of the train control system. In this paper, we propose the operation headway calculation for radio based train control system and a new train interval control algorithm to improve the operation headway. The proposed headway calculation defines line headway and station headway by the estimation the safety margin distance reflecting the performance of the train control system. Furthermore the proposed Enhanced Train Interval Control(ETIC) algorithm defines a new movement authority including both distance and speed, and improves the train operation headway by using braking distance occurring inevitably in the preceding train. The proposed operation headway calculation is simulated with Korean Radio-based Train Control System(KRTCS) and the simulated result is compared to improved train interval control algorithm. According to the simulated results, the proposed operation headway calculation can be used as performance indicator for radio based train control system, and the improved train control algorithm can improve the line and station headway of the conventional radio based train control system.

화상처리식검지시스템 대구역 현장시험을 통한 성능평가

오세찬(Oh Seh-Chan),이장무(Lee Chang-Mu),이한민(Lee Han-Min) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월

The vision based monitoring system detects possible accidents in railway platform area by using multiple cameras and sensors, and immediately reports the detection results with alarm message to the station and train. Moreover, the system makes train emergency stop to handle immediately by using a connection mechanism, which links vision based monitoring system with railway signal system. KRRI(Korea Railroad Research Institute) have developed the vision based monitoring system as a national research and development project since 2005. In this year, we have finished the system installation in Dae-gu station and tested in real operation condition. This paper presents the system overview with configuration, detection algorithm, and evaluation of the system detection performance.

지하철 사고 감시를 위한 스테레오 비디오 부호화 기법

오세찬(Seh-Chan Oh),김길동(Gil-Dong Kim),박성혁(Sung-Hyuk Park),이한민(Hanmin Lee) 한국철도학회 2005 한국철도학회논문집 Vol.8 No.6

In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed scheme is designed for providing flexible video among various displays, such as control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC coding scheme for predicting the P- and B-types of frames of the right-view sequence. The IBMDC coding scheme predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service, we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. The experimental results show the efficiency of proposed coding scheme by comparison with already known methods and the advantages of disparity estimation in terms of scalability overhead. According to the experimental results, we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.

철도 승강장 승객안전을 위한 비전기반 물체 검지 알고리즘 연구

오세찬(Oh Seh-Chan),박성혁(Park Sung-Hyuk),정우태(Jeong Woo-Tae) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

Advancement in information technology have enabled applying vision sensor to railway, such as CCTV. CCTV has been widely used in railway application, however the CCTV is a passive system that provide limited capability to maintain safety from boarding platform. The station employee should monitor continuously CCTV monitors. Therefore immediate recognition and response to the situation is difficultin emergency situation. Recently, urban transit operators are pursuing applying an unattended station operation system for their cost reduction. Therefore, an intelligent monitoring system is need for passenger"s safety in railway. The paper proposes a vision based monitoring system and object detection algorithm for passenger’s safety in railway platform. The proposed system automatically detects accident in platform and analyzes level of danger using image processing technology. The system uses stereo vision technology with multi-sensors for minimizing detection error in various railway platform conditions.