• Journal of Navigation and Port Research
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• v.34 no.10
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• pp.833-838
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• 2010

The Supreme Court in Korea judged the conduct of vessels in narrow channel was applied in order to prevent a ship collision in narrow channel, regardless of kind of a ship or weather situation, as application was not excluded as vessel restricted in her ability to manoeuvre without other special circumstances such as receiving the right of keep her course and speed from the other vessel, any priority was not guaranteed for vessel restricted in her ability to manoeuvre in regard to the other vessel following the conduct of vessel in narrow channel. In this judgement, there is concern to cause disorder to interpretation in the rule of narrow channel and responsibility between vessels. Therefore, this study aims to suggest correct interpretation about the rule concerned.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.1
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• pp.17-22
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• 2013

If we were in a head-on or crossing situation with a target ship and did not know the target ship's intention to change her course, we might be confused about our decision making to change our course for collision avoidance and be in a danger of collision. In order to solve these problems, we need to develop an automatic system which enables mariners to easily detect a change in the target ship's course and efficiently avoid being on a collision course. In this paper, we proposed an early detection method on altering course of a target ship using the steering wheel signal. This method will contribute to the reduction of collision accidents and also be used to the VTS system and the analysis of marine accidents.

• Computational Structural Engineering
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• v.7 no.2
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• pp.89-99
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• 1994

The nonlinear dynamic behaviors of guardrail established on the local or high way have been investigated using BARRIER VII program with respect to four design variables such as section type of beams and posts, impact angle, impact velocity and vehicle weight. Computer simulation programs are sophisticated analytical models for analyzing dynamic vehicle/barrier interactions and provide a relatively inexpensive alternative to full scale crash testing. This study has been focused on the structural adequacy, occupant risk, and vehicle trajectory. For this purpose, the maximum defection and impact force have been calculated to design the clear zone and to analyze effect of impact attenuation. Also, the acceleration of vehicle and exit angle after collision have been computed to estimate the occupant risk. From this study, it is suggested that we should strengthen the design criteria of guardrail to prevent from disastrous traffic accidents.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.9
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• pp.1259-1265
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• 2022

Recently, AI, big data, and IoT technologies are being used in various solutions such as fire detection and gas or dangerous substance detection for safety accident prevention. According to the status of occupational accidents published by the Ministry of Employment and Labor in 2021, the accident rate, the number of injured, and the number of deaths have increased compared to 2020. In this paper, referring to the dataset construction guidelines provided by the National Intelligence Service Agency(NIA), the dataset is directly collected from the field and learned with YOLOv4 to propose a collision risk object detection system through object detection. The accuracy of the dangerous situation rule violation was 88% indoors and 92% outdoors. Through this system, it is thought that it will be possible to analyze safety accidents that occur in industrial sites in advance and use them to intelligent platforms research.

• Journal of Digital Convergence
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• v.10 no.6
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• pp.225-230
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• 2012

When a car accident happened, the accident vehicle should broadcast a safe message to its neighbors in multi-hop. However, the pure flooding is difficult to protect a chain-reaction collision because of the frequent collision and the communication delay. To solve this problem, we proposes a back-off algorithm applied to the estimation of the neighbor node count using the t-distribution. And we proposes a MAC protocol preventing the communication delay by separating the neighbor's count collection channel and data channel. As a result, we show the frame reception success rate of our protocol improved more 10% than the previous protocol.

• Korean Journal of Construction Engineering and Management
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• v.12 no.5
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• pp.71-80
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• 2011

Flying net should be installed on every 3 or 4 construction floor from 8m above ground according to the rule. In the apartment housing construction, flying net installation work has been recognized the most dangerous work among the whole works because a small mistake of labors might make their death accident. Sub-contractors specialized in flying net have been developing various flying net types. However, most works of installing flying net as working with the developed system are performed outside the apartment housing, so that the risk of fall in works of installing supports and unfolding net is still high. Furthermore, as using the previously developed flying net labors might bump into the frame or the wire rope for supporting so that it makes secondary accidents. The objective of this research is to produce the proto-type of anti-collision flying net system based on the result of problem analysis on the installation and detachment process and suggest the improved anti-collision flying net system, which is able to improve safety and field applicability by conducting field experiment and analyzing performance.

• Journal of the Korean Society of Marine Environment & Safety
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• v.22 no.1
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• pp.98-107
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• 2016

The purpose of this study is for Human error prevention to acquire Collision Risk Perception Index (CRPI) sensed by the Officer Of the Watch (OOW) when the approaching distances are reduced in six types of ship encountering situations (Head on, $045^{\circ}$, $090^{\circ}$, $135^{\circ}$, Overtaking, Overtaken) between own ship and a target ship and then to predict CRPI fitting coefficients with polynomials in the curve-fitting process. CRPI acquisition experiments are carried out on two coast-guard ships and with the total of 30 crew members. Analysing results shows that CRPI data have goodness of fit to the six types of encountering situation. Futhermore, the One-Way ANOVA results show that CRPI has a negative affect to the OOW's age, career and license grade as the approaching distances is reduced. The availability of CRPI curve fitting with 3 degrees of polynomial was testified through the RMSE as 1.19 to Head on, 0.87 to $045^{\circ}$, 0.81 to $090^{\circ}$, 0.71 to $135^{\circ}$, 1.29 to Overtaking and 0.87 to Overtaken.

• Journal of the Korean Society for Railway
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• v.16 no.2
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• pp.122-128
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• 2013

As a result of investment in railway safety focusing on passenger safety, the train accident rate has been reduced by half domestically and we have reached a high level of safety compared to other countries and other transportation modes. However, accidents related to staff are still at a high ratio compared to other countries. There have been few studies on staff safety and no relevant systematic safety measures have been implemented. More than 90% of staff fatalities occurred from rolling stock in motion and electrification, which are representative railway accidents. In this study, causes of accidents, and current safety measures for staff are analyzed focusing on trains in motion. The results can be utilized for developing new safety measures.

• Proceedings of the Safety Management and Science Conference
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• 2010.11a
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• pp.601-607
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• 2010

비신호교차로 사고를 대상으로 신호기 운영방법과 차로폭에 따른 고령운전자 교통사고 특성을 파악하기 강화군, 무주군, 원주시, 보령시의 3년간(2007년-2009년) 교통사고 데이터를 사용하여 일반운전자와 고령운전자의 사고를 비교, 분석하였다. 그 결과, 고령운전자 교차로 교통사고는 점멸신호기로 운영되는 교차로사고는 일반운전자보다 다소 높았으며, 정면충돌사고 일반운전자 사고의 8배나가 높게 나타났다. 또한 고령운전자 교차로 교통사고는 차로폭이 6m초과 13m이하의 교차로에서 41.0%가 발생하여 왕복 3-4차로에서의 교차로에서 고령운전자의 교통사고 발생률이 높은 것으로 나타났다. 따라서 고령운전자의 교차로 교통사고 예방을 위해서는 6m초과 13m이하의 도로에 대한 대책이 마련되어야 할 것이며, 점멸신호기로 운영되는 교차로에 대한 점검이 필요하다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.490-492
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• 2012

우리나라에는 현재 항만 및 연안의 15개 VTS시스템이 설치되어 있으며 연안 VTS는 우리나라 연안에 추가하여 지속적으로 설치를 예정하고 있다. 이러한 VTS 시스템에 대한 H/W적 설치는 선진항만에 뒤지지 않지만, 표준화된 관제정보 제공의 부재, 운항자 및 관제사와의 위험도 견해 차이가 발생할 뿐만 아니라 관제사별로 이러한 위험도에 대한 견해 차이가 존재하고 있어 Human Error를 유발할 수 있다. 또한 이로 인하여 09년 12월 인천항 부근의 XING GANG호 충돌사고와 같은 해양사고가 발생할 수 있어 관제의사 결정을 위하여 통항 위험선박 표시 방법 시스템에 대한 구축 기반 마련 및 이에 대한 개발을 수행하여 해양사고 예방에 기여하고자 한다.