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  • Title/Summary/Keyword: post-fire

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A Study on the Corrosion According to Post-Forming Treatment of a Horizontal Side Wall Sprinkler Head Deflector (측벽형 스프링클러 헤드 디플렉터의 성헝후처리에 따른 부식특성에 관한 연구)

  • 민인홍;전동일;김형종;박종연
    • Fire Science and Engineering
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    • v.16 no.1
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    • pp.77-83
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    • 2002
  • The objective of this study is to propose a method to prevent the possible stress corrosion cracking of a horizontal side-wall sprinkler head deflector in the same atmosphere of ammonia gas as it regulated in the UL (Underwriters Laboratory). A corrosion test is carried out for three types of specimen according to post-forming treatment, one of which is annealing, another sand blasting and the other no treatment. The observation of the test specimens with a metal micro-scope says that the tensile residual stress is a major factor causing corrosion cracking, and that a proper heat treatment can remove or reduce the residial stress and prevent a crack from occurring even in a severe corrosive atmosphers.

Estimation of Biomass of Pinus densiflora Stands Burnt Out by the 2005 Yangyang Forest Fire (2005년 양양산불 피해 소나무림의 연소량 추정)

  • Lee Byung-Doo;Chang Kwang-Min;Chung Joo-Sang;Lee Myung-Bo;Lee Si-Young;Kim Hyung-Ho
    • Korean Journal of Environment and Ecology
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    • v.20 no.2
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    • pp.267-273
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    • 2006
  • The biomass of Pinus densiflora stands burnt out by the 2005 Yangyang forest fire was estimated based on the grades of fire severity; light, moderate and heavy. In order to measure the post-fire ground biomass in kg/ha, the ground fuels including shrub layer were collected and weighted and the crown biomass was estimated using allometric regressions and leaf area index for dry weight of P. densiflora. The pre-fire biomass was assumed to be equal to that of non-damaged P. densiflora stands having the same characteristics. The results indicated that the forest fire burnt out fuels of stands; 3,693 kg/ha in the light-damaged, 8,724 kg/ha in the moderately-damaged, and 17,451 kg/ha in the heavily-damaged forest stands.

The Influence of the Motivational Incentive Program on the Learning Achievement of New Firefighters (동기유발 프로그램이 신입 소방공무원의 학습성취도에 미치는 영향)

  • Lee, Geun-Chul
    • Journal of the Korean Society of Industry Convergence
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    • v.23 no.2_2
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    • pp.191-198
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    • 2020
  • The purpose of this study is to examine the impact of synchronous induction programs on new fire-training students' grits and learning outcomes. The research target selected 108 new firefighters from Fire & Marine School. 108 is composed of 54 experimental and control groups and isexecuted once a week, 60 minutes per session, and 10 sessions of synchronous inducement program.The research tools used grids to conduct pre- and post-test, and the mid-term and final-term tests were compared and analyzed. The data analysis was conducted using the SPS 22.0 program.The results showed that the motivational program showed statistically significant differences in the grids and had a significant impacton the final exam results of new firefighters. So, you have a passion for long-term goals and a passion for long-term goals. Research will need to be conducted continuously to raise the level of effort and provide fire-fighting school programs that can help with academic achievement.

Integrate-and-Fire Neuron Circuit and Synaptic Device using Floating Body MOSFET with Spike Timing-Dependent Plasticity

  • Kwon, Min-Woo;Kim, Hyungjin;Park, Jungjin;Park, Byung-Gook
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.15 no.6
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    • pp.658-663
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    • 2015
  • In the previous work, we have proposed an integrate-and-fire neuron circuit and synaptic device based on the floating body MOSFET [1-3]. Integrate-and-Fire(I&F) neuron circuit emulates the biological neuron characteristics such as integration, threshold triggering, output generation, refractory period using floating body MOSFET. The synaptic device has short-term and long-term memory in a single silicon device. In this paper, we connect the neuron circuit and the synaptic device using current mirror circuit for summation of post synaptic pulses. We emulate spike-timing-dependent-plasticity (STDP) characteristics of the synapse using feedback voltage without controller or clock. Using memory device in the logic circuit, we can emulate biological synapse and neuron with a small number of devices.

Biomass Structure and Dry Matter Dynamics in a Fire Influencing Montane Subtropical Humid Grassland, Western Ghats Southern India

  • Paulsamy, S;Manian, S.;Udaiyan, K.;Arumugasamy, K.;Nagarajan, N.;Kil, B.S.
    • The Korean Journal of Ecology
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    • v.24 no.4
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    • pp.227-232
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    • 2001
  • The biomass structure for three major components viz., the dominant grass, Chrysopogon zeylanicus Thw., the 'other grasses' and the'remaining species'and dry matter dynamics for total community were studied over a period of one year in an annual fire influenced subtropical humid grassland community in Western Ghats, India. The biomass of aboveground, belowground and litter compartments were high as in other humid grasslands and generally have positive correlation with rainfall, rainy days and relative humidity with the exception of litter parts. The above and belowground net primary productions (4,561 and 722 g/㎡, respectively) were also higher and were comparable with other humid tropical grasslands. The turnover of organic matter was rapid, Of the total input of 14.47 g/㎡ into the system, about 86.3% was allocated to above ground parts and 13.7% to below ground parts. The total disappearance was 2.56 g/㎡ and it was accounted to be 17.68% of the total output. The net surplus of dry matter (82.32%) in the post fire community indicates that the grassland was maintained in a seral stage. Hence it is suggested that prescribed burning may keep this ecosystem in a highly productive and seral stage.

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The Relationships among Experiences of Traumatic Events, Post-traumatic Stress and the Needs for Health Promotion Programs of 119 Paramedics (119구급대원의 외상사건 경험, 외상후 스트레스와 건강증진 프로그램 요구도와의 관계)

  • Kang, Mi Suk;Kim, Young Im;Geun, Hyo Geun
    • Research in Community and Public Health Nursing
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    • v.28 no.4
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    • pp.524-536
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    • 2017
  • Purpose: This study aims to examine the relationships among experiences of traumatic events, post-traumatic stress (PTS), and the needs for health promotion programs of 119 paramedics. Methods: Experiences of traumatic events, PTS, and needs for health promotion programs were measured using a structured questionnaire. The subjects were 193 paramedics in Jeju Island. Data were analyzed using descriptive statistics, t-test and x2 test. Results: The most experienced event out of the 16 different traumatic events was 'retrieve a suicide's body.' A high-risk classification of PTS was observed in 36.2% of the subjects. The rates of experiences were higher than those of the actual needs for all 26 health promotion programs. The programs reported as highly needed by respondents were stress management (75.5%) followed by exercise (74.6%) and PTS management (72.5%). Subjects with longer career periods, a fire sergeant, perceived obesity, numerous experiences of traumatic events, and in the PTS risk group had a higher need for a stress management program. Conclusion: These findings indicate that a significant number of 119 paramedics experienced PTS. They also show that onsite strategic management is strongly required. In addition, implementation of health promotion programs based on the needs of 119 paramedics is highly needed.

Incident shock and Related Factors in Rescue Workers (구조대원의 사건충격 정도와 관련 요인 분석)

  • Yoo, Eui-Tae;Cho, Sung-Je
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.5
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    • pp.2225-2233
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    • 2013
  • This study was designed to identify the extent of incident shock who are in high risk of post traumatic shock stress, and analyze the related factors that affect the extent of incident shock. The subjects are 415 rescue workers from Seoul Metropolitan Fire & Disaster Headquarters, who are in high frequency of fire outbreaks and rescue mobilization. With a reliability of Cronbach's α=.975, the results show invasion, avoidance, sleep disorder and emotional paralysis, dissociative symptom, hyper arousal as foremost causes respectively. Moreover, the results imply that the extent of incident shock was higher in people with more age or being married. Also, from the occupational perspective, the number of years as fire fighters, as rescue workers, mobilization and experiences at work in proportion to incident shocks has risen exponentially. It is notable that the groups who alleviate stress by consuming liquors had higher extent of incident shock. In conclusion, to deal with groups in high risk, management system and prevention care programs for incident shocks need to be introduced immediately and put into effect.

Analysis of Psychological and Physiological Changes According to the Experience of the Care Farm of Fire-fighters (소방공무원의 치유농장 체험 활동에 따른 심리·생리적 변화 분석)

  • Jang, Hye Sook;Yoo, Eunha;Kim, Jeong Hee;Jeong, Sun-Jin;Kim, Jae Soon;Ryu, Doo Young
    • Journal of Korean Society of Rural Planning
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    • v.27 no.1
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    • pp.71-83
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    • 2021
  • This study conducted a survey and analysis of saliva cortisol and psychological questionnaire in order to find out the psychological and physiological changes according to the experience of the care farm targeting fire-fighters. In the program to experience care farms, the total cortisol concentration as a stress hormone decreased after participation, and there was a statistically significant difference (z = 2.858, p <.01). As a result of the risk distribution analysis of the level of post-traumatic stress symptoms of firefighting officials who participated in the program to experience care farms, the high-risk group was found to be as high as 31.2%. In addition, the relative explanatory power of the independent variables that influence the loyalty of the care farm experience activity was found to have an effect in the order of program satisfaction, age, and reliability, and among them, program satisfaction was found to be the most influential variable. Therefore, it is believed that the care farm experience activities as the application of the healing program will have a positive effect on the activation of care farms in each region and the relief of stress symptoms of fire-fighters.

The Study on the Countermeasure Plans about Leakage, Explosion and Fire Accidents of Atmospheric Storage Tank (옥외저장탱크 누출, 폭발 및 화재사고 대응방안에 관한 고찰)

  • Lee, Gab-Kyoo
    • Fire Science and Engineering
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    • v.30 no.6
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    • pp.48-56
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    • 2016
  • A crude oil leakage from a large atmospheric storage tank occurred on 4 April 2014 at 14:50 in Ulsan City, while storing the crude oil in the tank. Emergency Rescue Control Group was deployed in the scene. The company, Fire Service Headquarters and associated agencies got together in Command Post (CP) for discussing an effective corresponding strategy. Many solution plans were drafted in the debate such as power down, stopping the facilities, checking the density of inflammable gas, suppressing oil evaporation, moving the leaked crude oil to a nearby tank and a processing plant and avoiding marine pollution. All the solutions were carried out in cooperation with several agencies and partners. The oil leakage accident was successfully settled up within the process of responding, The Fire Service Headquarters and the company thought that the most important thing was the suppression of oil evaporation and the elimination of ignition source. With Fire Service Headquarters and several agencies' every effort, an explosion and a fire didn't occurred in the scene. This study suggest the improvement of the operating system in Emergency Rescue Control Group in case of petroleum leakage, explosion and fire accidents of atmospheric storage tank, different from a ordinary disaster. Assuming that petroleum leakage in atmospheric storage tank develop the explosion and fire accidents, the spreading speed of the flame and the burning time was experimented and compared with each other. Furthermore, this study concentrates on the effective field response plan prepared for the afterward explosion and fire accidents from petroleum leak in a storage tank, with the database experimented and analyzed in accordance with the angle of radiation in the foam nozzle and the pressure of pumping in a fire engine.