• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.267-268
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• 2022

Jeju coastal waters are limited to high-risk areas due to the passage of international cruise ships, passenger ships, with a large number of people and fishing boats, or to the jeju port and the jeju civilian-military combined port and near by seas, so a VTS system will be established along jeju and seogwipo coast. There is no accurate standard for determining the number of people required by the maritime traffic control center. Therefore, this study calculated the required operating personnel for control seats on the coast of jeju and seogwipo by using VTS big data to efficiently calculate the workload of maritime traffic control. It is judged that this study can be used basic data for research that sets the standard for calculating the control workload.

• Journal of Navigation and Port Research
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• v.34 no.3
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• pp.213-220
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• 2010

Following the application of Formal Safety Assessment(FSA) to bulk carriers, crude oil tankers and large passenger ships, an urgent need to consider the safety of general cargo ships has recently been raised through the International Maritime Organization(IMO)(IMO, 2006a), and related FSA studies are being carried out by International Association of Classification Societies(IACS) as a preparatory work for the discussion on the issue of general cargo ship safety in the IMO committee. FSA is a structured and systematic methodology which is based on the techniques of risk analysis and cost benefit assessment to assist in the decision-making process, and aims at enhancing maritime safety, including protection of life, health, the marine environment and property. FSA can be used as a tool to facilitate the development of regulatory changes equitable to the various parties, with a view to aiding the achievement of consensus, and to help in the evaluation of new regulations and in making a comparison between existing and possibly improved regulations(IMO, 2007). This study aims at verifying the usefulness of FSA methods as a tool to conduct a safety assessment of general cargo ships flying the Korean flag, and providing useful information on 'the safety of general cargo ships' for IMO committee's discussion on the matter at a future session. FSA comprises five steps, however, steps 1(Hazard identification) and 2 (Risk analysis) from the FSA study for the Korean-flagged general cargo ships are discussed in this paper.

• The Journal of the Convergence on Culture Technology
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• v.8 no.3
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• pp.191-201
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• 2022

In this study, we are going to derive problems for fire and safety management in multiple-user Buildings and suggest improvement measures to prevent recurrence through analysis of legal operation status for safety management of multiple-user Buildings and case studies of large-scale fires in multiple-user Buildings. For this study, first, the current state of the industry and fire occurrence status were investigated through theoretical considerations of the multi-use industry, and then the previous research on the multi-use industry was analyzed. and by analyzing the legal and institutional status of multiple-user Buildings, problems were derived through cases such as the Jecheon fire in Chungcheongbuk-do, the Inhyeon-dong fire in Incheon, and the Songpa-gu fire in Seoul. As a result, first, the necessity of strengthening the initial fire response capability. Second, thorough maintenance and management of emergency exits. Third, the need for rational regulation of upholstery. Fourth, reinforcement of fire safety education and training. Fifth, strengthening of installation standards for firefighting and safety facilities. Sixth, we derive the result that it is necessary to raise awareness about safety management, compare and analyze it with legal and institutional contents, and suggest solutions accordingly. When looking at the causes of fires in multi-use buildings, building owners, business owners, and employees think that there is no possibility of a fire occurring in their business premises, so there is a lack of awareness. It is necessary to raise awareness through education and publicity of firefighters and related administrative agencies.

• Journal of Korean Society of Disaster and Security
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• v.9 no.2
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• pp.15-21
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• 2016

According to the disaster statistics issued by the Ministry of Public Safety and Security, traffic accidents, fire, collapses and others are classified into twenty-three (23) categories. In the past, disasters were mainly caused by the influence of nature, such as typhoon or drought. On the other hand, as society has become city-centered, social disasters' types, frequencies and scales are becoming more diversified and ever-increasing. However, there are no specific criteria and assessment methods that can measure degrees of social disasters-related risks objectively. Therefore, this study targeted traffic accidents, fire and collapses from major social disasters, utilized data that are related to occurrence rate, scale of casualties and scale of property loss in past eight years, and calculated the disaster risk index using the distance (Euclidean distance) between two points on the 3D spatial coordinates, in order to make the objective assessment by social disaster type possible. These results will enable the objective evaluation of risk index of major social disaster to be used as the foundational data when building the national disaster management system.

• Journal of the Korean Geosynthetics Society
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• v.14 no.3
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• pp.43-51
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• 2015

In seasonal frozen areas which have a temperature difference in the winter and spring season like south korea, if stiffness reduction by repeated freezing and thawing occurs to slopes adjacent to private facilities or mountain slopes, safety factor is insufficient to design criteria and landslide could be occurs due to rainfall or snowfall. It can lead to large damage of human life and property. In this study, in order to examine the safety changes of mountain slopes by repeated freezing and thawing, soil samples series of SP and SM by USCS distributed in surface soil of mountain slopes were collected for specimens. Through the direct shear test, the characterestics of frozen soil shear strength were analyzed and by utilizing numerical methods, chracteristics of strength reduction of weathered granite soil according to repeated action of freezing and thawing, changes in the stability of the slopes when applying freezing and thawing of the soil samples were examined. As a result, the maximum shear stress decreased approximately 10%, and slope stability analysis confirmed that required safety factor is less than compare with the non-frozen samples.

• 연구논문집
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• s.29
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• pp.39-48
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• 1999

This paper deals with the lobby pressurization for smoke control in building fires. A computer program and related modeling technique are presented. The pressure difference between a lobby and a fire area is not able to be same among building floors because an injection fan can not be installed in each floor. The most remote area from the injection fan has therefore the smallest pressure difference if flow areas are not different through all floors. An adjacent floor from the injection fan has possibly too large pressure difference because the most remote lobby must also meet the required pressure difference over the fire area. Moreover this problem will lead to a larger capacity of the fan. It is showed that the fan capacity can be decreased by adjusting the flow area of air supply duct in each floor.

• Fire Science and Engineering
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• v.30 no.5
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• pp.108-115
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• 2016

Fire detectors play an important role in alerting the related people to the initial stages of fire to protect assets and life. Therefore, the performance in detecting fires in the early stages without the risk of false alarms is important. Owing to a recent revision of the national fire safety standards to install smoke detectors in living rooms used for sleeping, staying, hospitalizing in apartment house/efficiency apartment/lodging facility/medical facility/facility for elderly and young, the application of smoke detectors is increasing. On the other hand, there is lack of research in preventing false alarms. This study improved algorithms to prevent false alarms in analog photoelectric smoke detector's due to sudden dust and better classify pollution and fire signals through a self-compensatory function. Through this study, alternatives are suggested to reduce the number of false alarms of Analog Photoelectric smoke detectors, and prevent financial losses due to false alarms.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.7
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• pp.863-869
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• 2018

Due to recent changes in the maritime traffic environment, naval warship accidents are constantly occurring. Especially in 2017, serious loss of life was caused by a US navy destroyer accident. The purpose of this study is to analyze the characteristics of naval warship accident cases and construct an accident scenario by using naval training materials, adjudication of naval warship accidents and US navy destroyer accident reports. Based on the surveyed data, the status of accidents was identified and cases were analyzed. We reproduced 17 accident cases in accordance with accident reproduction procedure and constructed naval warship accident scenarios. As a result of analyzing the CPA, TCPA and PARK model for risk, reproducing 17 naval ship accident cases, collision risk increased on average 5-6 minutes before an accident. The result of this study represents basic data for naval and simulation education materials, contributing to the prevention of marine accidents.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.115-115
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• 2022

2020년 역대 최장의 기간을 기록한 장마는 8월초 기록적인 폭우와 홍수로 이어지면서 전국 곳곳에 많은 인명과 재산피해 등 커다란 상처를 남겼다. 최근의 재해 발생 및 특성을 살펴보면 수자원 시설물의 운영·관리 기준의 한계를 벗어난 극단적 기후 현상의 규모와 발생빈도가 급격하게 증가하는 추세가 나타나고 있다. 이처럼 기후위기의 영향으로 집중호우, 극한가뭄 등의 발생빈도와 그 강도가 급증하는 상황에서 실제상황을 보다 신속, 정확하게 모니터링하고 예측하여 물관련 재해를 예방하고 대처하는 것은 무엇보다 시급한 과제라 할 수 있다. 또한 세계 각국은 코로나19로 인한 패러다임의 변화에 대응하고 경제위기 극복을 위해 산업 전반에 걸쳐 디지털 전환을 가속화 하고 있다. 정부도 코로나19로 촉발된 위기 극복을 위해 한국판 뉴딜의 대표과제로 디지털 트윈 사업을 추진하고 있다. K-water는 정부의 디지털 전환 정책에 발맞추어 기후위기에 따른 물관리의 복잡성, 불확실성에 대응하고 효율성과 신뢰도를 제고하기 위해 섬진강유역을 대상으로 디지털 트윈 물관리 플랫폼 구축을 추진하였다. 본 플랫폼은 유역내 기상·수문 관측자료를 실시간으로 모니터링하고 홍수, 가뭄, 수질, 댐안전 등 다양한 이슈를 사전에 시뮬레이션하여 결과를 3차원 지형에 표출하고 이에 대한 피드백을 통해 최적의 의사결정을 지원하는 체계로 구성되어 있다. K-water는 물관리 디지털 전환을 위하여 섬진강유역 구축을 기반으로 5대강 유역을 대상으로 플랫폼 구축을 확대할 예정이며, 댐하류·지류 합류부 등 재해 취약지역까지 아우르는 종합적인 물관리 의사결정의 One-System 플랫폼 구축을 확대할 예정이다. 이를 통해 유역 전체의 수문상황을 실시간으로 파악 및 신속하게 대응하고, 정확성이 향상된 의사결정으로 보다 효율적이고 안전한 물관리 기반을 마련하고자 한다. 또한 본 플랫폼에 기반한 디지털 물관리 기술 선도로 새로운 물산업 생태계를 조성하고, 민간기업과의 핵심기술 공동개발 등 기술협력을 통해 디지털 물산업 기술 경쟁력 확보에도 기여하고자 한다.

• Journal of Navigation and Port Research
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• v.46 no.4
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• pp.338-343
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• 2022

As the revitalization of the global maritime industry continues, the number of foreign ships navigating the maritime territories of maritime neighboring countries has rapidly increased. However, large-scale marine accidents have occurred, caused by the insufficient establishment of a system for management and operation relative to vessels' safety-condition. To address that, the IMO has granted the right to exercise port state control, especially for foreign vessels, to countries with jurisdiction over maritime territories with strengthening regulations and guidelines. In particular, the Republic of Korea, as a member of the TOKYO MOU, is conducting PSC, but as of 2020, the proportion of foreign ships was three times higher than that of national ships that called in domestic ports. However, the inspection rate was low at 9% which has not met the recommended level by the TOKYO MOU. Thus, this study conducted an IPA analysis as well as content analysis, by collecting the practical opinions and views of PSCO through objective questionnaires and written expert interviews, for improving the efficiency and effectiveness of domestic PSC. As a result, it was derived that the importance and performance related to human factors such as life on board, working environment, and response to safety accidents should be improved in to raise the quality of PSC inspection. Additionally, the work environment and performance of PSC in domestic ports for foreign vessels could be improved, if multifaceted support bases are established, for administrative unification of related tests for PSC, recruitment of PSCO, activation of the defection-reporting system, reorganization of the PSC execution group, etc.