• Journal of the Korean Association of Geographic Information Studies
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• v.21 no.3
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• pp.127-137
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• 2018

Recently, UAVs and Drones have been used for various applications. In particular, in the field of surveying, there are studies on the technology for monitoring the terrain based on the high resolution image data obtained by using the UAV-equipped digital camera or various sensors, or for generating high resolution orthoimage, DSM, and DEM. In this study, we analyzed the accuracy of GCP(Ground control point) matching using UAV and VRS-GPS. First, we used VRS-GPS to pre-empt the ground reference point, and then imaged at a base altitude of 150m using UAV. To obtain DSM and orthographic images of 646 images, RMSE was analyzed using pix4d mapper version As a result, even if the number of GCP matches is more than five, the error range of the national basic map(scale : 1/5,000) production work regulations is observed, and it is judged that the digital map revision and gauging work can be utilized sufficiently.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.4
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• pp.346-355
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• 2020

The purpose of this study was to suggest measures to improve safety and health training by analyzing trainees who participated in the training programs. A survey was administered to 226 trainees who participated in and completed the safety and health training programs provided by the Korea Occupational Safety and Health Agency. The study results showed that the level of satisfaction of employers for the training programs was the lowest compared to the middle managers and employees. Moreover, the middle managers' job competencies were increased, and they applied newly acquired knowledge and skills to their jobs. However, there were significant differences between industries. Finally, although all levels of trainee agreed on the effectiveness of safety and health training, the perceptions of employers were lower than those of employees. Based on these study results, several implications to improve the safety and health training were suggested.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2017.05a
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• pp.73-73
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• 2017

환경부는 화학물질로 인한 국민건강 및 환경상의 위해(危害)를 예방하고 화학물질을 적절하게 관리하고, 화학물질로 인하여 발생하는 사고에 신속히 대응함으로써 화학물질로부터 모든 국민의 생명과 재산 및 환경을 보호하기위한 법률인 "화학물질관리법"을 2015년 1월 1일부터 시행하였다. 화학물질관리법에서는 유해화학물질의 취급기준과 유해화학물질 취급시설의 설치 및 관리 기준을 준수토록 하고 있으며, 유해화학물질 취급시설을 설치 및 운영 시에는 사전에 화학사고 발생으로 사업장 주변 지역의 사람이나 환경 등에 미치는 영향을 평가하여 유해화학물질 취급시설의 설치단계에서 안전성을 확보하기 위한 유해화학물질 화학사고 장외영향평가서를 작성 및 제출하도록 하고 있다. 또한 사고대비물질을 규정 수량이상 취급하는 경우 위해관리계획서를 작성하여 지역사회에 고지하도록 하고 있다. 법 시행 이전에 유해화학물질 취급시설을 설치한 사업장은 사업장 규모에 따라 장외영향평가서의 제출 유예기간인 2019년 12월 31일까지 제출하여야 하며, 사고 대비물질의 영업허가를 득해야하는 사업장은 2017년 내 장외영향평가서를 제출하여야 한다. 장외영향평가(off-site risk assessment(ORA)) 제도는 유해화학물질 취급시설의 기본평가정보(공정 정보), 장외평가정보(사고 시나리오 선정 및 위험도 분석), 타 법령과의 관계정보로 구성되어 있다. 장외영향평가의 효율적인 작성을 위하여 현장과 일치된 공정정보(공정개요 및 공정도면 등의 자료)의 확보가 필수적이다. 본 발표에서는 복잡한 장외영향평가 제도로부터 기업의 대응을 위한 장외영향평가 운영 절차와 장외영향평가서의 효율적인 작성을 위한 사전 준비 자료 및 작성 방안을 제시하여, 사업장에서 장외영향평가 제도를 이행하는데 도움을 주고자 한다.

• Fire Science and Engineering
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• v.15 no.2
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• pp.13-19
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• 2001

The OECD defines regulatory reform as both better regulation and deregulation, and emphasizes that governments must continue to regulate in areas such as environmental quality and safety. In contrast, Korean regulatory reform in fire services in the 1990s shows quite a strange trend, having been carried out only to the direction of softening and abolishing regulations. In the UK, fire prevention legislation has been strengthened since the enactment of the Fire Precautions Act 1971, and the Building Regulations 1991, which apply to all new buildings including a private house, require that there should be at least one smoke alarm on each floor. This research shows that the tightening of fire prevention legislation in the UK has promoted fire safety, which is very instructive for Korean fire services. In order for Korean fire services to protect citizens'lives and property from fires, one of basic directions of regulatory reform, to improve the quality of regulations relating to safety, health and the environment, should be observed strictly. Moreover, the flexibility of the basic direction of regulatory reform should be ensured so that the regulations concerning safety could be even increased under the overall reform strategy of reducing all regulations.

• International Journal of Highway Engineering
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• v.12 no.2
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• pp.63-69
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• 2010

Since speed limit enforcement in school zones is the most important to reduce the occurrence of severe child related accidents, school zones typically have a speed limit of 30km/h. However, it is found that the majority of vehicles passing school zones are traveling over 30km/h. This indicates that school zones are not being effectively operated to achieve the main objective which is the reduction of child related accidents. This study aims to identify the factors affecting the violation of speed limits in school zones through the results of field survey from 8 elementary schools. The results showed that time period, the number of lanes, the width of sidewalks, and the status of colored pavement were found to be highly associated with the violation of speed limits in school zones at the 95% significance level. The results of this study may provide some insights for making safe environments around schools.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.4
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• pp.354-363
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• 2012

Now there are a lot of expired satellites or space debris around the earth orbit and they threaten the operating satellites and manned space missions. KOMPSAT-2 that scheduled to operate the mission by July, 2013 also has to consider the space debris. This paper introduces the '25 years rules' that must be re-entered within 25 years after the space mission for LEO satellites and describes the removal trajectory design that satisfies the '25 years rules' and minimizes fuel consumption. And this paper suggests monte-carlo simulation for risk analysis that causes the approaching object to the removal trajectory. The result shows that the collision probability of worst case presents 6.0741E-07 and it need to more analysis about precise satellite safety during removal maneuver because there is no information about the object size that approaching to the satellites.

• Korean Journal of Construction Engineering and Management
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• v.5 no.4 s.20
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• pp.115-121
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• 2004

The purpose of this study is to develop checklist and manual in order to control and manage military construction project in an environmentally friendly way during each stage in construction. The main contents of the study are as follows. 1) Checklists and manual are developed for reviewing the construction project in advance to meet environment codes and regulations during each stage of project. 2) Critical check points of environment management program focused on waste are identified. 3) A new construction paradigm in harmony with sound environment is established through the application of program for proactive waste control. The study also recommends that, as a future research, the development of a web-based manual be developed for more easy applications in general construction project.

• Journal of the Korea Society of Computer and Information
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• v.13 no.3
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• pp.237-242
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• 2008

This study aims to provide theoretical base in criminal law for engineers in the viewpoint of jurists to encourage interdisciplinary studies on cyber crimes. Apart from seriousness of discussion on torrent cyber crimes, a good effect of the internet networks such as sharing of information has bee emphasized while the evil influence of its side effect has been neglected. Therefore, this study suggests that we need to consider reinforcement of cyber ethics, and legal mind of IT technicians, strict security by managers, active efforts to develop legitimate contents by managers of web hardware and P2P, and reinforcement of punishments against crimes by internet users. And this study approaches new norms on computer and cyber crimes in interpretational sense of criminal law, and provides the theoretical base of the criminal law focusing on traditional theories, assumptions, and precedents involved in regulations against computer virus distribution.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.11
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• pp.1091-1097
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• 2015

Graphite material has been widely used for making the rocket nozzle throat because of its excellent thermal properties. However, when compared with typical structural materials, graphite is relatively weak with respect to both strength and toughness, owing to its quasi-brittle behavior, and gets oxidized at $450^{\circ}C$. Therefore, it is important to evaluate the thermal and mechanical properties of this material for using it in structural applications. This study presents an experimental method to investigate the fracture behavior of ATJ graphite at elevated temperatures. In particular, the effects of major parameters such as temperature, loading, and oxidation conditions on strength and fracture characteristics were investigated. Uniaxial compression and tension tests were conducted in accordance with the ASTM standard at room temperature, $500^{\circ}C$, and $1,000^{\circ}C$. Fractography analysis of the fractured specimens was carried out using an SEM.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1696-1700
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• 2010

현재 국내에서 적용하고 있는 관내 최대유속기준 3.0m/s의 타당성을 평가하고자 SWMM 모형을 이용하여 최대유속 적용기준에 대한 우수관거 수리분석 연구를 수행하였다. 강우시 모니터링 지점의 우수유입에 따른 관내 실측결과와 검 보정을 통하여 모형을 구축하였으며, 설계빈도(10년 빈도) 홍수 유입시 관내 수리특성을 분석하였다. 관 최적 설계안 수립을 위한 관거 모델링 수행을 통해 관 경사, 조도계수 변화에 따른 관내 최대유속 민감도 분석을 수행하고 최대유속 기준 변화에 따른 최적설계안을 제시하였다. 일반적으로 우수관거 수리계산시 실무에서는 MAKESW 프로그램을 사용하고 있다. 본 연구에서는 MAKESW가 반영하지 못하는 호우시 관거내 유속, 유량변화 시계열을 SWMM 모형을 통하여 우수관거 수리분석을 수행하였다. 실제 사업지구의 경우 MAKESW를 이용하여 설계된 관내 최대유속이 3.0m/s 이하 일지라도 월류, 압력류, 배수영향을 종합적으로 고려하는 SWMM 모형의 수행결과는 일부 관거에서 설계기준 이상의 유속이 발생하는 것으로 나타났다. 설계빈도 홍수량 유입시 관 경사, 조도계수 변화에 따른 관거 내 최대유속 민감도 분석을 수행한 결과, 관 경사가 5‰ 증가할 때 관내 최대유속은 약 4~26% 증가했으며, 관경사가 완만한 경우 관 경사 증가에 따른 최고유속의 증가 민감도는 더 커졌다. 관 조도계수에 따른 최고유속 분석결과 관 조도계수가 0.005 커질 때 최고유속은 약 30% 증가하는 것으로 분석되었다. 현재 국내의 최대 유속기준을 준수하려면 규정보다 훨씬 많은 맨홀 또는 암거의 낙차공을 설치해야 하기 때문에 공사비 증대를 초래할 수 있다. 아직 기본적인 연구단계지만 본 연구결과와 보완연구를 통하여 최적의 관내 최대유속 기준조건을 우수관거 설계계획에 반영한다면 공사비 절감, 공기단축 등의 효과가 있을 것으로 판단된다.