• Title/Summary/Keyword: 방화시간

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A Study on Fire Prevention Capability Performance Evaluation of the Phosphate Flame Retardant Honeycomb Core (인계 난연 허니컴 코아의 방화성능평가에 관한 연구)

  • Moon, Sung-Woong;Lim, Kyung-Bum;Rie, Dong-Ho
    • Fire Science and Engineering
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    • v.24 no.3
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    • pp.72-77
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    • 2010
  • Honeycomb core structure with its excellent stiffness and strength is being utilized in many fields such as interior building material. Because it is inexpensive and renewable, honeycomb paper production is economically and environmentally helpful. However, the paper needs to be fireproofed because it is vulnerable to fire. In this study, we have undergone the performance evaluation process of the honeycomb paper which is widely used as interior material of a fire door and packing material. Four kinds of honeycomb (a honeycomb made of flame-resistant paper; a honeycomb attached with conventional flame-resistant film made in the laboratory; honeycomb impregnated with flame retardant; a honeycomb attached with flame-resistant film after impregnating fire retardant) were used in the study to compare the fire retardant performance. As a result, the honeycomb with impregnated flame retardant showed the highest performance. The flame-resistant film was effective in delaying the igniting time but had a negative effect on the rate of heat and smoke production.

Pressure Differentials in the Elevator Lobby Depending on the Evacuation Scenarios (피난 시나리오에 따른 승강장 부속실 차압 특성 연구)

  • Park, Yong-Hwan
    • Fire Science and Engineering
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    • v.21 no.4
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    • pp.38-43
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    • 2007
  • The aim of this paper is to investigate the change of pressure differential and smoke propagation characteristics in the elevator lobby with the resident's evacuation scenarios using fire modelling technique. The results showed absolute pressures in the fire room and elevator lobby can significantly increase to cause fire door to the stairway unclosed once it is open. This is due to constant pressure differentials, the increasing reference pressure of fire lobby and pressure leak from elevator lobby to fire lobby. Smoke exhaust mechanism was needed to prevent the continuous pressure rise in the living room. Over 200 Pa was expected upon closing the door during pressurization, which provide difficulties in opening the door for next refugee. Opening both fire door and entrance door may induce smoke flow from fire room to elevator lobby and stairway.

For Improving Security Log Big Data Analysis Efficiency, A Firewall Log Data Standard Format Proposed (보안로그 빅데이터 분석 효율성 향상을 위한 방화벽 로그 데이터 표준 포맷 제안)

  • Bae, Chun-sock;Goh, Sung-cheol
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.30 no.1
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    • pp.157-167
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    • 2020
  • The big data and artificial intelligence technology, which has provided the foundation for the recent 4th industrial revolution, has become a major driving force in business innovation across industries. In the field of information security, we are trying to develop and improve an intelligent security system by applying these techniques to large-scale log data, which has been difficult to find effective utilization methods before. The quality of security log big data, which is the basis of information security AI learning, is an important input factor that determines the performance of intelligent security system. However, the difference and complexity of log data by various product has a problem that requires excessive time and effort in preprocessing big data with poor data quality. In this study, we research and analyze the cases related to log data collection of various firewall. By proposing firewall log data collection format standard, we hope to contribute to the development of intelligent security systems based on security log big data.

Effect on the Pollinating Activities of Honeybee, Apis mellierfa L.(Hymenoptera: Apidae) and Bumblebee, Bombus terrestris L. in Paprika Vinyl-Houses (시설파프리카에서 양봉꿀벌과 서양뒤영벌의 화분매개활동 효과)

  • Lee, Sang-Beom;Ha, Nam-Gyu;Yoon, Hyung-Joo;Park, In-Gyun;Lee, Kyeong-Yong;Gang, Ho-Sung;Hwang, Seok-Jo
    • Korean journal of applied entomology
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    • v.47 no.3
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    • pp.293-298
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    • 2008
  • This study was surveyed the effects by pollinating activity of Apis mellifera and Bombus terrestris released in the paprika vinyl-houses. The foraging activity and behaviour of A. mellifera and B. terrestris visited on the paprika flowers were nearly alike. The pick times of pollinating activity by A. mellifera and B. terrestris were showed the hightest at 11:00 and 15:00, and 09:00 to 11:00, respectively. The rate of fruit set by A. mellifera and B. terrestris released for pollinating paprika were same level with 94%, and these rate were higher than the fruit setting rate which was 92% by fan operated. The qualities of paprika produced by pollinators released were higher than those by fan operated. And weight per fruit, number of seeds per fruit and economical profit per 2,310 $m^2$ were over 10% higher than those by fan operated. Therefore the economical effects by the pollinating activities of A. mellifera and B. terrestris released in the paprika vinyl-houses were obviously demonstrated.

The Effect of Negative Pressure Phase in Blast Load Profile on Blast Wall of Offshore Plant Topside (해양플랜트 Topside 방화벽에 폭발압의 부압구간이 미치는 영향)

  • Kang, Ki-Yeob;Choi, Kwang-Ho;Ryu, Yong-Hee;Choi, Jae-Woong;Lee, Jae-Myung
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.27 no.4
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    • pp.281-288
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    • 2014
  • As a gas explosion is the most fatal accident in shipbuilding and offshore plant industries, all safety critical elements on the topside of offshore platforms should retain their integrity against blast pressure. Even though many efforts have been devoted to develop blast-resistant design methods in the offshore engineering field, there still remain several issues needed to be carefully investigated. From a procedure for calculation of explosion design pressure, impulse of a design pressure model having completely positive side only is determined by the absolute area of each obtained transient pressure response through the CFD analysis. The negative pressure phase in a general gas explosion, however, is often quite considerable unlike gaseous detonation or TNT explosion. The main objective of this study is to thoroughly examine the effect of the negative pressure phase on structural behavior. A blast wall for specific FPSO topside is selected to analyze structural response under the blast pressure. Because the blast wall is considered an essential structure for blast-resistant design. Pressure time history data were obtained by explosion simulations using FLACS, and the nonlinear transient finite element analyses were performed using LS-DYNA.

The design of the blocking system against file infected with virus on router (라우터기반 바이러스 감염파일에 대한 블록킹 시스템 설계)

  • 정종근;이윤배
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.7
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    • pp.1232-1237
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    • 2001
  • The technology of the internet has made advanced progress the number of users increase rapidly. but, the technology doesn't only show users good and beautiful sides. the immoral hackers containing even children create computer viruses, and then spread them over network. so it makes the threat of viruses more serious. In this paper, we designed an improved blocking system against the infected file with viruses on router after analysing blocking systems against virus previously developed. comparising with other systems, the system designed is more efficient in terms of communication in complexity since it omits the transmission time between router and blocking system.

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A Design of ATM Firewall Switch using Cell Screening (셀 스크리닝 방식에 기반한 ATM Firewall Switch의 설계)

  • Hong, Seung-Seon;Jeong, Tae-Myeong;Park, Mi-Ryong;Lee, Jong-Hyeop
    • The KIPS Transactions:PartC
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    • v.8C no.4
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    • pp.389-396
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    • 2001
  • 기존의 라우터 기반의 패킷 스크리닝 방식은 ATM 네트워크 상에서는 패킷 수준의 스크리닝 기능의 적용을 위하여 SAR(Segmentation And Reassembly) 과정을 필요로 하기 때문에 고속의 셀 처리를 수행하는 ATM Switch의 셀 처리 속도를 저하시킨다는 문제점을 안고 있다. 본 논문에서는 셀 스크리닝 방식에 기반한 병렬 처리 구조의 ATM Firewall Switch를 제안한다. 제안된 Enhanced ATM Firewall Switch는 셀 단위로 분할된 패킷의 1, 2번 셀들에 대한 검사만을 통하여 스크리닝 기능을 수행하기 때문에 셀 단위의 스크리닝 수행이 가능하며, 정책 캐쉬의 도입을 통해 셀 스크리닝 수행속도를 향상하였다. 또한 독립적인 User Cells Filter 기능 블록의 설계를 통하여 병렬 처리 구조의 셀 스크리닝 수행이 가능하도록 구성하여 셀 지연 시간을 최소화하였다.

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위험관리정보2 - 산소저감방식 : 보험자 관점에서 본 가능성, 한계, 그리고 경험

  • 한국화재보험협회
    • 방재와보험
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    • s.124
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    • pp.41-47
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    • 2008
  • 산소저감에 대한 프로젝트는 여러 가지 다른 이해관계와 의견 등을 종합적으로 고려해야 한다. 고객은 무엇보다도 안전하면서 비용적으로 효율적인 설비를 원한다. 도급자는 신기술을 신뢰하고 의지한다. 최신 기술이라도 이미 시간이 지난 것이라는 사실을 건축 계획자는 기억하지 못한다. 관할기관은 추가적 안전, 즉 비상시 보완적 수단을 원한다. 보험회사는 또 다른 위험을 감수하기를 원치 않는다. 신기술은 최첨단 기술과 신뢰할 만하고, 시험되고 인증된 설비를 반영한 문서의 초안을 요구한다. 안전요구 사항이 너무 낮다면 관할기관과 보험회사는 방화 수준을 향상시키는 것이 어렵다는 것을 지각한다. 우리는 권고사항을 알려주는 것만이 아니라 우리가 스스로 만들어낸 실수들을 부보하는 것이다. 자동차산업에서 리콜은 비용도 많이 들고 기업이미지 훼손도 심각하므로 고객들은 그들 스스로의 경험에 의지한다. 산소저감설비의 설치는 고객, 계획자, 보험회사에게 미래지향적이면서 안전한 설비를 선택했다는 확신을 심어줄 수 있다.

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Simulation Analysis of the BACnet-based Fire Detection/Monitoring System (BACnet 기반 화재감지/모니터링 시스템의 시뮬레이션 분석)

  • Song, Mu-Seok;Hong, Seung-Ho
    • Proceedings of the KIEE Conference
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    • 2001.11c
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    • pp.319-322
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    • 2001
  • 본 논문에서는 고층빌딩의 화재감지/모니터링 시스템에 대한 기준 모델을 제시하고 제시된 모델의 성능을 시뮬레이션을 통하여 검증하였다. 본 논문에서 제시하는 화재감지/모니터링 시스템 모델은 CSMA/CD 방식으로 동작하며 100 Mbps의 전송속도로 동작하는 Fast Ethernet을 백본망으로 사용하고 하부망으로는 MS/TP를 사용한다. 또한 시스템의 확장성과 유연성을 확보하기 위하여 현재 국내 빌딩 자동화 통신망의 표준 프로토콜로 제정된 BACnet을 기반으로 동작한다. 본 논문에서는 제시된 화재감지/모니터링 시스템 모델의 성능을 분석하기 위하여 이산사건 시스템 모델링 전용 툴인 ARENA를 사용한 시뮬레이션 모델을 개발하였다. 개발된 시뮬레이션 모델을 이용하여 네트워크 지연시간이 화재감지/모니터링 시스템의 성능에 미치는 영향을 분석하였으며, 분석된 결과를 바탕으로 본 논문에서 제시한 화재감지/모니터링 시스템 모델이 고층빌딩의 방화 설비 요구사항을 만족시킬 수 있음을 검증하였다.

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Improvement of fire suppression capability by use of air early release equipment (공기조기방출장치를 이용한 가스계 소화설비 성능 개선)

  • Jee, Moon-Hak;Moon, Chan-Koon;Kim, Hyung-Tack
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2012.04a
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    • pp.143-146
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    • 2012
  • 가스계 소화설비의 배관이 장거리 배관인 경우 소화약제 저장탱크의 선택밸브가 개방된 다음 소화약제가 화재지역에 방출될 때 까지 일정시간이 소요된다. 또한 소화약제 배관 내부의 공기와 소화약제가 함께 화재지역에 방출되어 소화약제 농도가 희석되므로 소화효과가 감소한다. 이러한 문제점을 해결하기 위하여 소화약제 배관이 방화지역으로 연결되는 지점에서 대기로 연결되는 공기 방출배관과 방출장치를 설치하여 가스계 소화설비의 소화효과를 높일 수 있는 설비 개선방안을 마련하였다.

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