• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.123-126
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• 2005

Recently many accidents have been occurred on track workers, these accidents have strong relationship with increase of train speed, electrification and multiple track portion. As a first step for the safety management, domestic and abroad track worker accidents data are analysed for the risk estimation of track worker. Analysis results shows that contact between track worker and train is the dormant reason. In order to reduce dormant reason fault trees are constructed in this study.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.263-268
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• 2004

In many countries safety management on track worker have been carried out alter serious accidents and drastic safety improvement have been achieved as a result of safety management. In order to improve track worker safety in Korea, recent 5-year accident data were analysed and other countries' safety management systems were reviewed. As an result of this study 5-basic requirements for the safety improvement on track worker are derived: education, certification, clear responsibility definition, work planning and upgrade of train warning system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.247-253
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• 2004

For the preparation of KTX operation and electrifying the conventional line, many accidental fatalities were occurred in recent year. In order to improve track worker safety as low as possible, risk assessments are carried out in this study. As an input of risk assessment 5-year accident data were analyzed into frequency and fatality. As a result risk of track worker based on equivalent fatality is derived.

• 한국안전학회지
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• 제35권3호
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• pp.72-78
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• 2020

The accident fatality rate has decreased by more than 90% compared to 2006, due to the safety management and safety investment based on the Rail Safety Act. Most railway safety indicators, including fatality rates, have improved significantly from 60% to 80%, reaching the level of developed countries in terms of most railway safety indicators. However, the only staff fatality rate at work is not improved, and it is 3 to 5 times higher than that of developed countries. Most of the fatality occurred during employee's work recently occurred due to accidents hit by train while track work. In principle, when operating track need to check or maintenance, the operation of the train should be stopped and the work carried out. However, in Korea, due to the highest passenger density and train operating density in the world, it is caused by a structural problem that requires workers to enter the track while the train is running and perform various tasks such as maintenance and inspection. In this study, we analyzed the risk of accidents caused by hit by trains on the track, which is the biggest cause of staff fatality, using the main statistics of the last 10 years. In detail, the scenarios of the main causes of hit by trains and workers were formed to suggest the effectiveness of the current preventive measures and supplementary.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.252-257
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• 2003

It is necessary to have a maintenance of track and its equipment for safety and s the railroad transportation. In the paper, we examine the safety problems, protecti and composition of protection system for safety within the track which RTRI develo system consists of a mobile business tool carried by each worker. a terminal of t platform temporarily installed in the maintenance car. a connector attached to signalling system and a central administrative device installed at the control cen used independently to detect positions of workers and maintenance cars. Each m correctly grasp the geometrical relations with other workers cars and other objects conditions based on the state information exchanged between the machines by the control protocol. the track occupancy monitor information broadcast by th administrative device and the line information. The protection system executes its f this basic structure.

• 한국인터넷방송통신학회논문지
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• 제24권2호
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• pp.41-49
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• 2024

본 논문은 선박 건조 현장에서 작업자 위치 추적 시스템의 모델링 및 구현 내용을 다룬다. 산업 현장에서 작업자의 위치 파악은 안전사고 예방을 위한 중요한 요소로 강조된다. 이에 본 논문에서는 전력선 통신과 비컨 통신을 결합한 시스템을 활용하여 작업자의 위치를 정확하게 추적하는 방법을 제시한다. 주요 구성 요소인 비컨 스캐너와 외부 모니터링 서버 시스템 구현을 다루며, 실험을 통해 시나리오별로 작업자의 위치 변화를 확인하고, 관리자 웹 서비스를 통해 작업자 위치 현황을 확인하는 방법을 제시한다. 이를 통해 안전 관리자에게 실시간 위치 정보를 제공하여 작업자의 안전을 보다 효과적으로 관리할 수 있는 시스템을 제안한다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.205-206
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• 2023

This paper presents a new method for indoor localization track workers in construction sites. While GPS and NTRIP are effective for outdoor positioning, they are less accurate when used indoors. To address this issue, the proposed method utilizes Aruco markers to measure the distance between workers and the markers. By collecting data values, the location of each worker can be determined in real-time with high accuracy. This approach has the potential to enhance work efficiency and safety at construction sites, as it provides more precise indoor positioning compared to conventional methods, leading to improved work efficiency.

• 한국BIM학회 논문집
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• 제7권1호
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• pp.45-53
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• 2017

Continuous research efforts have been made on acquiring location data on construction sites. As a result, GPS and RFID are increasingly employed on the site to track the location of equipment and materials. However, these systems are based on radio frequency technologies which require attaching tags on every target entity. Implementing the systems incurs time and costs for attaching/detaching/managing the tags or sensors. For this reason, efforts are currently being made to track construction entities using only cameras. Vision-based 3D tracking has been presented in a previous research work in which the location of construction manpower, vehicle, and materials were successfully tracked. However, the proposed system is still in its infancy and yet to be implemented on practical applications for two reasons. First, it does not involve entity matching across two views, and thus cannot be used for tracking multiple entities, simultaneously. Second, the use of a checker board in the camera calibration process entails a focus-related problem when the baseline is long and the target entities are located far from the cameras. This paper proposes a vision-based method to track multiple workers simultaneously. An entity matching procedure is added to acquire the matching pairs of the same entities across two views which is necessary for tracking multiple entities. Also, the proposed method simplified the calibration process by avoiding the use of a checkerboard, making it more adequate to the realistic deployment on construction sites.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1656-1664
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• 2007

본 논문에서는 고속선에 사용 중인 UM71C 궤도회로의 결함진단을 위한 개선방안을 연구하였다. 고속선 궤도회로는 구간이 길어 유지보수자에 의한 점검 시 많은 시간과 노력이 소요된다. 따라서 주기적으로 검측차를 운행하고 있다. 그러나, 궤도회로 결함 시 차상검측데이터의 변화를 정확히 알 수 없으므로 실제, 고속선 운행선상의 샘플개소를 선정하여 환경에 따른 선로정수를 구하고 전송라인의 특성임피던스와 전파정수를 반영시켜 단락전류에 대한 시뮬레이션을 수행하였으며, 임의의 지점에 결함을 발생시켜 측정한 결과와 시뮬레이션 수행한 결과를 비교하였다. 이렇게 검증된 시뮬레이션 프로그램을 이용하여 보상콘덴서의 기능저하 수량 및 용량변경에 따른 차상검측데이터를 예측하였다. 이것은 보상콘덴서의 기능저하를 사전 예측하여 열차의 안전운행을 확보하기 위해 필요하다. 또한 차상검측시스템에서 얻어진 검측데이터와의 비교를 통해 유지보수에 활용 가능한 활용지침 및 분석기준을 작성하기 위해 필요하다.

• 한국BIM학회 논문집
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• 제5권2호
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• pp.46-54
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• 2015

Vision-based tracking has been proposed as a means to efficiently track a large number of construction resources operating in a congested site. In order to obtain 3D coordinates of an object, it is necessary to employ stereo-vision theories. Detecting and tracking of multiple objects require an entity matching process that finds corresponding pairs of detected entities across the two camera views. This paper proposes an efficient way of entity matching for tracking of construction workers. The proposed method basically uses epipolar geometry which represents the relationship between the two fixed cameras. Each pixel coordinate in a camera view is projected onto the other camera view as an epipolar line. The proposed method finds the matching pair of a worker entity by comparing the proximity of the all detected entities in the other view to the epipolar line. Experimental results demonstrate its suitability for automated entity matching for 3D vision-based tracking of construction workers.