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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Fire Science and Engineering
Journal Basic Information
Journal DOI :
Korea Institute of Fire Science and Engineering
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Dec 2004
Volume 18, Issue 3 - Sep 2004
Volume 18, Issue 2 - Jun 2004
Volume 18, Issue 1 - Mar 2004
Selecting the target year
A Study on Eire Data Analysis in Korea, Japan and USA (2) Direct Property Losses Due to Fires
Lee Eui-Pyeong ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 1~15
The following matters were confirmed through the analysis of property losses due to fires in Korea, the U.S., and Japan. 1. Korean statistics on property losses are not the most detailed of the three centuries, and they have a lot of limitations to analyze the actual condition of property losses due to fires. 2. The percentage which takes up property losses due to fires in GDP is on the decrease in the U.S. and Japan, but increase in Korea. In addition, from 1994, it has occupied almost the same rate in Korean ad compared with the U.S. and Japan. 3. When inflation are taken into consideration, property losses due to fires in the U.S. and Japan have decreased, but in Korea, they have increased except for the recent 2 years.
A Study on the Actual Condition for Air Respirators Using Air-breathing
Lee Chang-Woo ; Lee Young-Jae ; Hyun Seong-Ho ; Seong Jae-Man ; Song Yun-Suk ; Choi Don-Muk ; Yoon Myung-O ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 16~21
This paper has investigated influences of pollutants in air-breathing on the respirators and it by year of disused air respirators that fire fighter is using in domestic cutting done air respirators after collection observed state of cylinder material through instrumental analysis, and cut open pipe to confirm pollution degree of pipe from cylinder of air respirators to airline mask and confirm pollution availability. The metal surface inside the air respirators was corroded by moisture included in the compressed air. The material generated by corrosion is white powder of less then 100㎛, which is analyzed as aluminum hydroxide corroded by moisture. This aluminum hydroxide powder may get into the lung while one breathes in, and it is easy to be attached to the lung so it will cause a serious influences to human health. This study suggests that Korea should set out the standards for components and composition of breathing air as soon as possible.
A Study on the Inflammable Gas Explosion Triggered by the Electric Discharge Static Eliminator on Voltage Application Type
Lee Chun Ha ; Ok Kyoung Jea ; Kim Jum-Ho ; Kwon Byung-Duck ; Cha Ha-Na ; Yun Kea Won ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 22~26
The static eliminator is used for prevention of disasters by static discharge, improvement of production efficiency, protection of a sensitive electronic element on the discharge of static, and it is handled for elimination of static in the painting plant, the film manufacturing plant, the producing semi-conductor factory. This study described on the explosion appearance by discharge phenomena on the voltage input type eliminator's ion generation bar of inflammable gas through an experimental tests. It was used Hydrogen, Ethylene, Propane, Methane gas with the inflammable gas and it was studied on the ignition phenomena by the length of ion-generation static bar, the number of ion-generation electrode and the variation of input voltage to the ion-generation electrode. As a result of this study it was confirmed that the shorter of the bar's length, the greater of explosion danger. And it is considered that there will not ignite at general using inflammable gas, in case of more than 900 mm bar and one electrode.
The Effect of the Distance Between
Agent Nozzle and Wall
Park Chan-Su ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 27~34
We have conducted a numerical simulation under three-dimensional unsteady conditions in order to analyze the effect of flow and CO₂ mass transfer according to the distance between the CO₂ nozzle of CO₂ fire fighting system and the rear wall in a protection space. Flow fields and CO₂ concentration fields were measured. The different recirculation flow form and wall jet was developed according to increasing the distance between CO₂ nozzles and rear wall. In all the case, CO₂ mass transfer was generated toward the center of a protection space from each walls, but the CO₂ mass fraction of front and rear areas based on CO₂ nozzles showed higher or lower by increasing the distance between CO₂ nozzle and rear wall.
Directional Water Spray Characteristics of Sprinkler Heads
Park Yong-Hwan ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 35~41
The water spray characteristics of the sprinkler heads is a very important factor affecting the fire suppression performance, and it is largely dependent on the shape of the head nozzle. This study investigated shape factors and spray distribution performances for the sprinkler heads of four domestic companies with big market shares. The experimental results revealed that all flow constants exceeded the required regulation limits, however showed big differences between head types although they have the same design limit. They were however relatively consistent regardless of the pressure increases. The spray distribution of some head samples showed severe directional eccentricity, which suggests more study for the improvement.
A Fire Detection System Using Fuzzy Logic with Input Variables of Temperature and Smoke Density
Hong Sung-Ho ; Kim Doo-Hyun ; Kim Sang-Chul ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 42~51
This paper presents a study on the analysis of fire detection system using fuzzy logic with input variables of temperature and smoke density. The input variables for the fuzzy logic algorithm are measured by fire experiment of small scale with temperature detector and smoke detector. The antecedent part of fuzzy rules consists of temperature and smoke density, and the consequent part consists of fire possibility. Also the triangular fuzzy membership function is chosen for input variables and fuzzy rules to simplify computation. In order to calculate fuzzy values of such fuzzy system, a computer program is developed with Matlab based on graphics user interface. The experiment was conducted with paper and ethanol to simulate flaming fire and with plastic and sawdust to model smoldering fire. The results showed that the fire detection system presented here was able to diagnose fire very precisely. With the help of algorithms using fuzzy logic we could distinguish whether fire or not.
A Study on the Characteristics of Pyrolysis of Methyl Ethyl Ketone Peroxide with Addition of Sulfuric Acid
Jung Doo-Kyun ; Choi Jae-Wook ; Lee In-Sik ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 52~56
An experiment to examine the characteristics of pyrolysis of Methyl Ethyl Ketone Peroxide was conducted in an air-present environment, using TG-DTA. Decomposition starting temperature was decreased as the increase of 98% concentrated H₂SO₄ to the MEKPO and the maximum decomposition temperature of MEKPO was 116.8℃. The activated energy calculated from differential method of pure MEKPO, MEKPO with 1 wt%, 3wt%, and 5wt% of H₂SO₄ were 0.576㎉/mo1, 0.355㎉/㏖, 0.284㎉/㏖ and 0.258㎉/㏖ respectively.
A Study on the Analysis of Heat and Metallurgical Structure of Connection Parts for Residual Current Protective Devices
Choi Chung-Seog ; Shong Kil-Mok ; Kim Dong-Ook ; Kim Dong-Woo ; Kim Young-Seok ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 57~63
We investigated heat properties of connection terminal in residual current protective devices(RCD) according to contact pressure for low voltage appliance. And we analyzed voltage and current waveform and oxide propagation when the poor-contact happened between terminal and wire. When contact pressure between terminal and connection wire was not applied, the heat was generated and an oxide was formed on the surface of the wire. The temperature of the insulation surrounding terminal was ascended sharply by poor-contact, micro-sparks and continuous arc sound happened in interior terminal. When the poor-contact by vibration occurred inner conductor of terminal and wire, an oxide was propagated on contact surface and the temperature was increased at 869℃. Thus, we found that the risk of electrical disaster is high in terminal and connection wire parts.
CCDP Evaluation of the Eire Area of NPPs Using Eire Model CEAST
Lee Yoon-Hwan ; Yang Joon-Eon ; Kim Jong-Hoon ; Noh Sam-Kyu ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 64~71
This paper describes the result of the pump room fire analysis of the nuclear power plant using CFAST fire modeling code developed by NIST. The sensitivity studies are performed over the input parameters of CFAST: the constrained or unconstrained fire, Lower Oxygen Limit (LOL), Radiative Fraction (RF), and the opening ratio of the fire doors. According to the results, a pump room fire is the ventilation-controlled fire, so it is adequate that the value of LOL is 10% which is also the default value. It is anlayzed that the Radiative Fraction does not affect the temperature of the upper gas layer. It is appeared that the integrity of the cable located at the upper layer is maintained except for the safety pump at the fire area and the Conditional Core Damage Probability (CCDP) is 9.25E-07. It seems that CCDP result is more realistic and less uncertain than that of Fire Hazard Analysis (FHA).
A Study on the Short-Circuit Characteristics of Vinyl Cords Damaged by External Flame
Choi Chung-Seog ; Kim Hyang-Kon ; Shong Kil-Mok ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 72~77
In this paper, we studied on the short-circuit process, surface structure, and component variation of vinyl cords. In the results of high speed imaging system (HSIS) analysis, as soon as wire covering was damaged by heat, the conductor of wire came in contact with the other conduct of wire, and the short-circuit occurred. Stereomicroscope and SEM analysis indicated that the source part of wire showed V-type form. The molten beads of load part were bigger than those of source part. In the results of EDX analysis, Cu and O were detected in the source part, whereas covering material (Cl, Ca), Cu and O were detected in the load part. The results will help us to find out the cause of electrical fire.
A Study on Safety by Risk Assessment of Clean Room
Song Yun-Suk ; Yoon Myong-O ; Hyun Seong-Ho ; Lee Chang-Woo ; Yoon Yo-Song ; Kim Sung-Min ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 78~85
This research analyzes Clean Room accidents, and presents research Clean Room, major fire prevention standards of Clean Room (FM, IRI, and NFPA Code), various results from Fire Simulation of analysis. The results are : the smoke diffusion is very quick coupled with the Heating, Ventilating, and Air Conditioning (HVAC) systems under fire ; the possibility of getting the result and the possibility the role of the Sprinkler systems to reduce the diffusion of the smoke. We learn about the importance to stop operating Heating, Ventilating, and Air Conditioning (HVAC) systems and to operate the Sprinkler system for securing safety with fire detection. Therefore, This research will be contributing to secure safety of Clean Room.
A Study on Charring Rate of Wood Exposed to a Constant Incident Radiation Heat Flux
Park Hyung-Ju ; Kim Hong ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 86~92
We tested five specimens of each species at each of five constant external heat flux levels (10, 15, 20, 25. and 35㎾/㎡). An Cone heater was used to expose the wood specimens to the heat flux. The 100-by 100-by 50-㎜ specimens were of four species: Redwood, White oak, Douglas fir, Maple. In result of test, charring of wood exposed to a constant external heat flux can be considered a linear with function of time. As compared with the charring rates Redwood is most rapidly, but on the other hand Douglas fir is most slowly. When the external heat flux is 35㎾/㎡, the charring rate is rapidly about twice then 10㎾/㎡. Using the Equation (2), the estimates for u were 1.02, 1.16, 1.23, 1.32, and 1.44 for the 10, 15, 20, 25, and 35 kw/m2 constant external exposure levels, respectively.
A Study on Assessment of Penetration Seals Performance of Nuclear Power Plants
Cho Hong-Seok ; Park Jun-Hyen ; Son Bong-Sae ; Im Jung-Soon ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 93~102
The function of fire barrier penetration sealing is highly important to confine a fire propagation a fire severity within a fire area where the fire started. Especially for the penetration seals at the nuclear power plants with the long-term operated history, it is needed to make it clear that the conformance to the sealing requirements has been proven to guarantee the fire-resistive performance of fire barrier penetration parts. If there are any parts of fire barrier penetration sealing which can not meet the required rating for the fire endurance performance, the relevant parts must be modified to meet regulatory requirements. At this paper, the engineering analysis methodology was established to approximate the fire endurance rating for the fire barrier penetration seals. With this study, the method of engineering analysis to decide fire endurance rating for the fire barrier penetration seals was established and this way can be utilized to check the performance of the fire rating for the penetration seal at the domestic nuclear power plants.
A Study on the Risk Assessment of the Underground Space -The Estimation of Smoke Reservoir Screen for Smoke Control in Subway Station Platform
Roh Sam-Kew ; Hur Jun-Ho ;
Fire Science and Engineering, volume 18, issue 4, 2004, Pages 103~109
The risk of underground space become an important issue of life safety thought the Taeku subway line Accident. It is essential to study of smoke control screen to minimize the damage of human life because of smoke passage and passenger evacuation routes are on the same vertical and dispersion movement. The Fire modeling result shows the effect of fire control screen can save the evacuation time about 2-2.5 times compare to existing the system However, The designs of fire control screen need to be complied with smoke control ventilation system to present optimum design and the position of installation.