• Title/Summary/Keyword: The causes of fire

Search Result 508, Processing Time 0.031 seconds

A Numerical Study on the Design of Water Mist Lance for Fire Suppression in Container (컨테이너 내부 화재진압을 위한 물분무창 설계에 관한 수치적 연구)

  • Han, Sang-goo;Choi, Jae-hyuk;Lee, Won-Ju
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.23 no.7
    • /
    • pp.941-947
    • /
    • 2017
  • Increasing marine transportation of dangerous goods using containers causes fire accidents on ships due to leakage of dangerous materials. In IMO (MSC.93), all vessels that are to be loaded five or more containers on weather deck area after 1 January 2016 are required to have a fire extinguishing system called Water Mist Lance (WML) on board. In this study, numerical analysis is performed to design WML with optimal edge radius of curvature using LS-DYNA. The analysis results for the three models with 10 mm, 15 mm and 20 mm lengths of the edge part showed that the only model with 15 mm length penetrated the wall of the container and did not cause damage to the edge of the WML. In the future, based on the results of this study, we will make a WML of prototype and conduct a performance test. And we will continue to improve the problems.

A Study on the Improvement of Chemical Accident Response System in View of the National Disaster Management System (국가재난관리체제 관점의 화학사고 대응체계 개선방안에 관한 연구)

  • Lee, Jae-Seok;Choi, Don-Mook
    • Fire Science and Engineering
    • /
    • v.29 no.5
    • /
    • pp.73-78
    • /
    • 2015
  • Since the hydrofluoric acid spill accident in Gumi in 2012, the current situation has continued to suffer from makeshift responses or feeble national system maintenance in preparing real countermeasures against chemical accidents, regardless of their repeated occurrence and seriousness. Industrial chemical accidents have an enormous ripple effect on the whole country and society. The purpose of this study is to propose ways of establishing directions for the national disaster management system against repeated occurrence of chemical accidents. To achieve this goal, the present study proposed improvement measures of response system for industrial chemical accident through the analysis of the current response system and structural causes of disaster control failure for chemical accidents.

Design and Implementation of Local Forest Fire Monitoring and Situational Response Platform Using UAV with Multi-Sensor (무인기 탑재 다중 센서 기반 국지 산불 감시 및 상황 대응 플랫폼 설계 및 구현)

  • Shin, Won-Jae;Lee, Yong-Tae
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
    • /
    • v.10 no.6
    • /
    • pp.626-632
    • /
    • 2017
  • Since natural disaster occurs increasingly and becomes complicated, it causes deaths, disappearances, and damage to property. As a result, there is a growing interest in the development of ICT-based natural disaster response technology which can minimize economic and social losses. In this letter, we introduce the main functions of the forest fire management platform by using images from an UAV. In addition, we propose a disaster image analysis technology based on the deep learning which is a key element technology for disaster detection. The proposed deep learning based disaster image analysis learns repeatedly generated images from the past, then it is possible to detect the disaster situation of forest-fire similar to a person. The validity of the proposed method is verified through the experimental performance of the proposed disaster image analysis technique.

U-Bulguksa: Real-Time and Online Early Fire Detection Systems (U-불국사 : 실시간 온라인 화재조기감지시스템)

  • Joo, Jae-Hun;Yim, Jae-Geol
    • The Journal of Society for e-Business Studies
    • /
    • v.12 no.3
    • /
    • pp.75-93
    • /
    • 2007
  • This paper presents real-time online early fire warning systems developed for preserving cultural properties of Bulguksa which is a world heritage designated by UNESCO. The system is based on the ubiquitous sensor network employing 900MHz and 2.4GHz bands. In this paper, we analyze requirements that should be considered in building effective management systems of cultural heritages by using wireless sensor network. Finally, we introduce the architecture, sensor and network design, and software design of the fire warning systems which is an initial version of U-Bulguksa. The current version of systems has been operating in Bukguksa for a few months. U-Bukguksa project sponsored by National Information Society Agency is ultimately aimed at developing an integrated system of U-cultural heritage management and U-tourism. The former aims to conserve and manage intangible cultural properties by providing a variety of environmental information such as erosion, crack, and gradient as well as fire which are important causes of loss and damage in real-time and online. The latter refers to the intelligent tourism information and guidance systems allowing tourists to get the personalized content on cultural heritages and help guidance with mobile devices in Bulguksa.

  • PDF

Predicting and Preventing Damages from Gas Leaks at LPG Stations (LPG 충전소의 가스누출에 따른 피해예측 및 감소방안)

  • YANG-HO YANG;HA-SUNG KONG
    • The Journal of the Convergence on Culture Technology
    • /
    • v.9 no.4
    • /
    • pp.577-585
    • /
    • 2023
  • This study applied ALOHA Program to predict the damage caused by fire and explosion predicted to occur from gas leakage at LPG stations and presented plans to prevent damages by diagramming the impact range and distance. The propane gas leakage from LPG stations causes human damage like breathing issues and property damage, including building destruction to residents in the surrounding areas. As a way to reduce this, first, the hazardous substance safety manager of the LPG station needs to check frequently whether the meters and safety valves are working properly to prevent leakage in advance. Second, the LPG stations' storage tanks should be worked by the person who received "hazardous substance safety manager training" under the provisions of the Act on the Safety Control of Hazardous Substances and has been appointed as a "hazardous substance safety manager" by the fire department. Third, LPG station's various safety device functions, such as overfill prevention devices, must be checked on a regular basis. Finally, wearing work clothes and shoes that prevent static electricity at LPG stations is highly recommended, as static can cause a fire when gas leaks.

A Study on the Thermal Degradation Properties of Epoxy Resin for Cast Resin Transformer (몰드변압기용 에폭시 수지의 열 열화특성에 관한 연구)

  • Lim, Kyung-Bum;Nam, Ki-Dong;Kim, Ki-Hwan;Park, Su-Hong;Hwang, Myung-Hwan
    • Fire Science and Engineering
    • /
    • v.22 no.2
    • /
    • pp.44-48
    • /
    • 2008
  • In this paper, we measured a contact angle, surface resistivity and XPS to study the thermal aging characteristics of the epoxy resin for cast resin transformer. As a result of this experiment, we found that the contact angle increases up to $200^{\circ}C$ as it causes a re-crosslinking on the surface, but starts decreasing at $250^{\circ}C$ as it causes heat condensation. As a result of examining the oxygen/carbon peaks through the XPS analysis, we obtained a higher oxygen peak vs. carbon in the first untreated sample, but it showed the opposite trend after heat treatment. That rise in the carbon peak continued up to $200^{\circ}C$, but decreased again at the temperatures above. That's because it kept forming a stable surface structure up to $200^{\circ}C$ but its carbon combination got destroyed due to a rapid oxidization at $250^{\circ}C$. And a conduction path was formed easily with the hydrophile property caused by rapid surface activation.

Case Analysis of the Harmful Chemical Substances' Spill (유해화학물질 유출의 사례 분석)

  • You, Jisun;Chung, Yeong-Jin
    • Fire Science and Engineering
    • /
    • v.28 no.6
    • /
    • pp.90-98
    • /
    • 2014
  • Lately accidents of harmful chemical substance in korea were repeatedly replaying. We studied problems and preparation plan in 2008 years~2014 years through analysis cases of harmful chemical substance. Leakage of chemical substance's accident situation shows that leakage in the workplace is the most 10 cases, accounting for 58.6% is the largest proportion in 2009. Leakage according to explosion accounting for 50% (5 cases) in 2004, 25% (4 cases) in 2007 and 33.3% (4 cases) in 2011 has very irregular change. Therefore, A major cause of accidents is lack of safety management. Harmful chemical substance showed various aspects, high residual substance and non-visible characteristic so response and recovery was easy. And the second damage to move a distance causes environment pollution. So a mutual-assistance system and integrated system of related organization have to build and expert of chemical incident response and therapist of chemical substance response have to establish to do efficient and rapid response.

A Study on the Current Fire Insurance Subscription and Solutions for Ensuring the Safety of the Traditional Market (전통시장 안전성 확보를 위한 개선방안: 화재보험 가입실태를 중심으로)

  • Kim, Yoo-Oh;Byun, Chung-Gyu;Ryu, Tae-Chang
    • Journal of Distribution Science
    • /
    • v.9 no.4
    • /
    • pp.43-50
    • /
    • 2011
  • Concerning the risk factors of the outbreak of a fire in a traditional market, most of those markets are located in downtown areas or residential areas; thus, although their location may be favorable in terms of marketability, they face a potential risk in that a fire may develop into a large blaze owing to poor environment or the absence of facilities prepared for disaster during a fire. Moreover, as many people are densely poised in the markets, it is very probable that a fire may occur owing to the excessive use of heaters in the winter as well as the reckless use of electric and gas facilities. It seems that traditional markets encounter difficulty being insured against fire, because of their vulnerability and that the vast majority of small-scale sellers are likely to suffer mental anguish and tremendous physical injury in case of a fire. However, most of those sellers in the traditional markets are hand-to-mouth sellers, and they lack awareness of safety concerns and have insufficient experience in safe facility management. As small-scale sellers constitute the majority in the traditional market, the subscription rate of fire insurance in most of the traditional markets is low for the reasons of their needy circumstances and their financial burden. Statistically, the subscription by street vendors is non-existent; therefore, these vendors have a fairly limited access to indemnification after fire damage. Because of these problems, this study's purpose is to identify the current level of insurance subscription by these markets, which are exposed to poor facilities and vulnerability to fire. In order to fix this, it appears that shop owners and consumers will have to band together. For this study, we executed a fire policyholder fact-finding mission at traditional markets with approximately 108 and 981 stores. The research method was executed by an investigation using one-on-one individual interviews using a questionnaire. The contents investigated current insurance subscriptions. The method of analysis looked at the difference of insured amount according to volume size through cross-tabulation of the difference of insured amount by possession form, difference of insured amount by market form, difference of insured amount by category of business, difference of insured amount by market size, etc. Furthermore, the study should be used to propose solutions for problems through theoretical review with the use of a literature research, because the field case study was through interviews with the persons concerned, and the survey of the current insurance subscriptions by traditional market shopkeepers. The traditional market would generally have difficulty affording fire insurance. Fire insurance subscription rates of most of the market proved to be inactive, because of the economic burden of payment. Lack of funds is thought to be the main factor that causes a lack of realization about the necessity of fire insurance. In addition to expensive insurance premiums, sometimes, the companies' valuation of the businesses is lower than their actual valuations, and they do not pay out enough during a claim. The research presents an improvement plan that, when presented at the traditional markets, may strengthen their ability to procure fire insurance through the help of the central government. Researchers connected with the traditional market mainly accomplish the initial research. However, although this research has its limitations, it offers considerable benefits. For future researchers, I would suggest looking at several regions for comparison.

  • PDF

A Bibliographical Study of Oriental Medical Records on Alopecia (탈발(脫髮)에 관한 한의학(韓醫學) 문헌적(文獻的) 고찰(考察))

  • Lee, Yeong-Jong
    • The Journal of Korean Medicine
    • /
    • v.16 no.1 s.29
    • /
    • pp.141-159
    • /
    • 1995
  • The causes and treatment of alopecia are concluded based on the records found successive oriental medicine in order to persuade new treatments for alopecia as following : 1. In the context of modern medical science male-dominated alopecia was referred as dok-rak(禿落), cho-dok(早禿), chon-dok(全禿), pal-ju-tal-bal, chu-bal-sun and pal-sun(髮癬) alternatively, while alopecia areata was refereed as yu-pung(油風), pan-dok(斑禿), kwi-ji-du and kwi-che-du(鬼剃頭). 2. The causes of alopecia is related with condition of Gi(vital energy) and Hyul(blood) in the twelve channels, such as weakening of vital energy in the conduits, condition of internal organs as heat in the lung, weak kidney or liver vitality, and eating habits such as severe ingestion of bitter taste or sweet taste food. Other distinct reasons are penetration of wind and dryness into a head due to weakening Gi and Hyul inside human body, flaring up of the asthenic fire due to excessive eatings, hard labour or psychological sufferings deficiency of blood, deficiency of vital essence of kidney, phlegm caused by dampness and heat, and stagnated blood. 3. According to demonstration of alopecia, the causes of alopecia areata are listed as internal wind due to heat of blood, deficiency of liver and kidney, blookage of channels and collaterals by stagnated blood, and causes of male-dominated alopecia are listed as wind dryness caused by heat of blood, dampness and heat, and heat, wind and dryness due to deficiency of blood.

  • PDF

Electrical and Fire Prevention Measures through Improvement of Indoor Wiring, Outlets and Plugs (옥내배선, 콘센트 및 플러그 개선을 통한 전기화재 예방대책)

  • Jeung, Sueng Hyo;An, Hui-Seok;Lee, Yong-Su;Kim, Chang-Eun
    • Journal of the Korea Institute of Construction Safety
    • /
    • v.1 no.1
    • /
    • pp.31-39
    • /
    • 2018
  • It is reported that about 20 % of all fires in Korea are caused by the electric equipment and installations. In complex and large-scale buildings, the sizes of electric fires are becoming larger as property damage and casualties increase. Among the causes of various electric fires, fire by short circuit accounts for about 71.5% of overall fires, and in the classification by electric equipment and installation, fire caused by wiring and wiring equipment accounts for approximately 38.3% of overall fires. The purpose of this study is to propose methods to prevent electric fires due to short circuit by improving indoor wiring currently in use and to find the fundamental measures to prevent wiring equipment caused fires by improving the socket and plug which are commonly used in wiring equipment. It is expected that the electric fire prevention measures presented through this study can be used as a measure to protect many people and properties by eliminating the root cause of electric fire.