• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2013년도 추계학술대회
• /
• pp.56-57
• /
• 2013

This paper is mainly concerned with the interaction effects between two vessels and sidewall with a mound. Experimental study on hydrodynamic forces between ship and sidewall with a mound was already shown in the previous paper, measured by varying the distances between ship and sidewall. The ship maneuvering simulation was conducted to find out the minimum safe distance between vessels, which is needed to avoid sea accident in confined waters.

• 산업경영시스템학회지
• /
• 제13권22호
• /
• pp.71-78
• /
• 1990

Some problems to assess the safety of automated man-machine system are studied in many ways. The difficulty occurred in this system is the vagueness of human behavior. Fuzzy set theory is used to assess the human behavior in safety analysis. The unsafe behavior listed top 10 in accident statistics would be explained as the factors of human vagueness. Three cases are considered, which consist of man-machine system as man-man, man-machine, machine-machine types. For the design of safe task, using characteristics of work performance, each motion cycle time is required to know the rate of learning. Approach of human behavior to the standard motion means more safe motion. It is important to design the works as to minimize the time performance to the standard motion's, which utilize the control of risk potential with easy. In that process, use of fuzzy set theory is appropriate to analyze the human behavior to identify its vagueness.

• 한국항해항만학회지
• /
• 제38권6호
• /
• pp.561-565
• /
• 2014

This paper is mainly concerned with the interaction effects between two vessels and sidewall with a mound. Experimental study on hydrodynamic forces between ship and sidewall with a mound was already shown in the previous paper, measured by varying the distances between ship and sidewall. The ship maneuvering simulation was conducted to find out the minimum safe distance between vessels, which is needed to avoid sea accident in confined waters. From the inspection of this investigation, it indicates the following result. When and if one vessel passes the other vessel through the proximity of sidewall with a mound, the spacing between two vessels is needed for the velocity ratio of 1.2, compared to the case of 1.5. Also, for the case of ship-size estimation, the ship maneuvering motion is more affected by interaction effects for the overtaken small vessel, compared to the overtaking large vessel.

• 한국정보통신학회논문지
• /
• 제25권1호
• /
• pp.160-163
• /
• 2021

In this paper, we present a path search scheme for the safe movement of the swarm of unmanned systems in unknown dangerous areas. Some of the swarm searches for the primary and secondary paths before the majority of swarm move through dangerous areas. In terms of rapid movement from the dangerous area and preparation for an accident, the primary path is searched first in the destination's direction. The secondary path is searched by considering the distance between the paths to guarantee a safe distance. The computer simulations show that the proposed scheme is suitable for the swarm of unmanned systems.

• 한국항해항만학회지
• /
• 제30권1호
• /
• pp.29-34
• /
• 2006

연구는 1997년부터 2003년까지 우리나라 전국에서 발생한 스쿠버 잠수 사고 자료를 수집 및 분석하고 일본 및 미국에서 발생한 잠수 사고와 비교 분석하여 우리나라 스쿠버 잠수 사고의 특성을 밝혀내었다. 연구 결과는 잠수 사고 예방에 큰 기여를 할 수 있을 것으로 기대된다. 사고 자료는 대한수중협회의 기술위원회에 보고된 자료와 해양경찰청의 자료, 스쿠버 잠수 전문점에 전화 통화 및 방문 조사를 실시하여 얻은 정보, DAN(Diver Alert Network)에서 발행한 잠수 사고 보고 자료집, 월간 잡지에 수록된 잠수 사고 보고 자료, 그리고 세미나 발표 자료 등을 참조하였다. 자료 분석은 사망 사고에 국한하였으며 분석 결과 우리나라의 사망률이 일본의 2.8배, 미국의 2.2배 수준인 것으로 나타났다.

• Safety and Health at Work
• /
• 제10권1호
• /
• pp.54-60
• /
• 2019

Background: Increasing the establishment of integrated management systems (IMSs) is done with the purpose of leaving traditional management methods and replacing them with modern management methods. Thus, the present study sought to analyze the events and investigate the impact of IMS on health and safety performance indices in an Iranian combined cycle power plants. Methods: This case study was conducted in 2012 in all units of the Yazd Combined Cycle Power Plant on accident victims before and after the implementation of IMS. For data analysis and prediction of indices after the implementation of IMS, descriptive statistics and Kolmogorov-Smirnov test, Chi-square, linear regression, and Cubic tests were conducted using SPSS software. Results: The number of people employed in the power plant in an 8-year period (2004-2011) was 1,189, and 287 cases of work-related accidents were recorded. The highest accident frequency rate and accident severity rate were in 2004 (32.65) and 2008 (209), respectively. Safe T-score reached to below -3 during 2010-2011. In addition, given the regression results, the relation between all predictor variables with outcomes was significant (p < 0.05), except for the variable $X^1$ belonging to the accident severity rate index. Conclusion: The implementation of safety programs especially that of IMS and its annual audits has had a significant impact on reducing accident indices and improving safety within the study period. Accordingly, health and safety management systems are appropriate tools for reducing accident rate, and the use of regression models and accident indices is also a suitable way for monitoring safety performance.

• 한국실내디자인학회논문집
• /
• 제36호
• /
• pp.84-92
• /
• 2003

Schools should be a safe and comfortable environment for learning and studying. However, school facilities are usually used by many students during restricted time. These conditions such as many people, restricted time and space mold a chain of school accidents. In Korea, the school accidents are increasing annually and many students experience 'big or small incidents' and are exposed to 'potential accidents'. In this study, I investigated the present situation of the elementary schools' accidents in In-Cheon area, and analyzed the various characteristics of them. The accidents in elementary school have tendencies of occuring frequently in higher grade and boy students relatively. As analyzed in the place of accident, classrooms have a set of factors of accident, on the other hand, corridor and staircase show single distinct cause of safety problem. And also, the major portion of accidents is associated with the door in restroom and entrance space. In order to reduce the severity and frequency of school accidents, there should be needed multilateral and interdisciplinary approach. To achieve the safe school environments, this study focused on establishing a foundation of practical directions in designing elementary schools.

• 디지털융복합연구
• /
• 제10권6호
• /
• pp.225-230
• /
• 2012

교통사고가 발생하면 사고 차량은 주변 차량에게 안전 메시지를 멀티 홉으로 브로드캐스트 해야 한다. 하지만, 순수한 플러딩 방식을 사용하면 잦은 충돌로 인해 통신 지연이 유발되고 이로 인해 연속 추돌 사고 예방이 어렵다. 본 논문에서는 이러한 문제점을 해결하기 위해 속도에 따른 이웃 노드의 수를 t-분포를 이용하여 추정하고 이를 백오프 알고리즘에 적용한다. 그리고 멀티채널을 이용하여 이웃 노드 개수의 수집 채널과 데이터 채널로 분리하여 통신 지연을 예방하는 MAC 프로토콜을 제안한다. 결과적으로, 기존 기법보다 제안된 프로토콜이 프레임 수신율이 10% 이상 개선되었음을 확인하였다.

• 수산해양기술연구
• /
• 제55권2호
• /
• pp.145-151
• /
• 2019

The coastal composite fishery has the highest rate of around 30.0% in registered fishing vessels of Korea for the last three years. The risk analysis for the fisher's safety of coastal composite fishing vessels was conducted to serve as a basic data for improving the healthy and safe working environment of fisher using fisher's occupational accidents of the national federation of fisheries cooperatives (NFFC) from 2016 to 2018 (n = 1,105). As a result, the occupational accident occurrence rate of coastal composite fishery was 3.76% in all industries, 7.8 times the rate of that. In addition, death and missing rate was found to have a serious level management to 10.10‱. Among the accidents, 76.0% occurred at sea. The slipping, others and contact with machinery or fishing gear occurred more frequently in order in the frequency of accident occurrence pattern. In the risk assessment using frequency and severity, slipping, contact with machinery and others showed high risk during fishing. The results are expected to contribute to identification and assessment of safety hazard occurred in coastal composite fishing vessels.

• 한국재난정보학회:학술대회논문집
• /
• 한국재난정보학회 2023년 정기학술대회 논문집
• /
• pp.129-130
• /
• 2023

The From COVID-19 until recently, the demand for hiking has been rapidly increasing due to the popularization of mountain seekers.,On weekends and holidays, people who do not hike frequently while hiking in large and small mountains to see wildflowers and foliage in the mountains are more likely to be exposed to safety accidents due to an increase in sudden muscle use.,If you fall or get muscle damage during a hike, you can prevent a major accident with a simple treatment. In some cases, the error of first aid may permanently damage the important function of the body.,In particular, during a safety accident on a mountain, while climbing in light clothes, the body temperature rises due to the sweat that was shed at the beginning, and the blood pressure rises due to the contraction of the blood vessels due to the drop in body temperature from the top, resulting in an emergency such as cardiac arrest.,According to statistics from the National Park Service, nearly half (48%) of deaths in national parks are known to be sudden cardiac deaths.,There are many safety accidents that occur frequently in the mountains, but among them, we will study how to cope with acute diseases such as cardiac arrest due to increased blood pressure due to insufficient body temperature control, chest pain or dyspnea, and heart burden due to excessive hiking.