• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.10 no.3
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• pp.359-367
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• 1999

The analysis of a surface wave antenna with the corrugated ground plane fed by a parallel-plate waveguide is considered. An equivalent theorem Is employed to subdivide the original problem into three regions for the simple analysis : one concerning the geometry inside the shorted parallel-plate(Internal region 1), one concerning the geometry of the corrugation(Internal region 2), and one concerning the geometry of the conducting wedge(External region). The hybrid method of moment(MOM)/uniform geometrical theory of diffraction(UTD) method is applied to analyze a corrugated surface wave antenna with the end-fire radiation. Our numerical results are very well matched with those of the previous experiment, better results are obtained when compared with those of the previous simple equivalent current approach. Also, we can obtain the parameters to design an effective end-fire corrugated surface wave antenna.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.1244-1250
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• 2009

In this study it is intended to review the moving characteristics of smoke by performing visualization for the calculation of the optimal smoke exhaust air volume in case a fire occurs in tunnels where transverse ventilation is applied, and to obtain basic data necessary for the design of smoke exhaust systems by deriving optimal smoke exhaust operational conditions under various conditions. As a result of this study, when the critical velocity in the tunnel is 1.75 m/s and 2.5 m/s, the optimal smoke exhaust air volume has to be more than $173\;m^3/s$, $236\;m^3/s$ for the distance of the smoke moving which can limit the distance to 250m. In addition, in case of uniform exhaust the generated smoke is effectively taken away if the two exhaust holes near the fire region are opened at the same time.

• Journal of Korean Society of Forest Science
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• v.85 no.1
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• pp.15-23
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• 1996

Preparing the era of forest resources management requires studies on forest fire. This study attempted to develop forest fire occurrence model using meteorological characteristics for the practical purposes of forecasting forest fire danger rate. To accomplish this goal, the relationships between forest fire occurrence and meteorological characteristics are estimated. In the process, the forest fire occurrence pattern of the study region(Taegu-Kyungpook) is categorized by employing qualification IV method. The study region was divided into three areas such as, Taegu, Andong and Pohang area. The meteorological variables emerged as affective to forest fire occurrence are relative humidity, longitude of sunshine, and duration of precipitation. To estimate the probability of forest fire danger, forest fire occurrence of three areas are regressed on the time series data of affective meteorological variables using logistic and probit model. The effectiveness of the models estimated are tested and showed acceptable degree of goodness. Those models developed would be helpful to increase the efficiency of forest fire management such as detection of forest fire occurrence and effective disposition of forest fire fight equipments.

• Steel and Composite Structures
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• v.15 no.6
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• pp.679-703
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• 2013

This paper presents experimental investigations of the fundamental behavior of concrete filled steel tube (CFT) beam-columns under fire loading. A total of thirteen specimens were tested to determine the axial force-moment-curvature-temperature behavior of CFT beam-columns. The experimental approach involved the use of: (a) innovative heating and control equipment to apply thermal loading and (b) digital image correlation with close-range photogrammetry to measure the deformations (e.g., curvature) of the heated region. Each specimen was sequentially subjected to: (i) constant axial loading; (ii) thermal loading in the expected plastic hinge region following the ASTM E119 temperature-time T-t curve; and (iii) monotonically increasing flexural loading. The effects of various parameters on the strength and stiffness of CFT beam-columns were evaluated. The parameters considered were the steel tube width, width-tothickness ratio, concrete strength, maximum surface temperature of the steel tube, and the axial load level on the composite CFT section. The experimental results provide knowledge of the fundamental behavior of composite CFT beam-columns, and can be used to calibrate analytical models or macro finite element models developed for predicting behavior of CFT members and frames under fire loading.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.166-166
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• 2023

Compound hazards (CHs) are two or more extreme climate events combined which occur simultaneously in the same region at the same time. Compared to individual hazards, the combination of hazards that cause CHs can result in greater economic losses and deaths. While several extreme climate events have been recorded across Asia for the past decades, many studies have only focused on a single hazard. In this study, we assess the spatiotemporal pattern of dry compound hazards which includes drought, heatwave, fire and wind across Asia for the last 42 years (1980-2021) using the historical data from ERA5 Reanalysis dataset. We utilize a daily spatial data of each climate event to assess the occurrence of such compound hazards on a daily basis. Heatwave, fire and wind hazard occurrences are analyzed using daily percentile-based thresholds while a pre-defined threshold for SPI is applied for drought occurrence. Then, the occurrence of each type of compound hazard is taken from overlapping the map of daily occurrences of a single hazard. Lastly, a multivariate assessment are conducted to quantify the occurrence frequency, hotspots and trends of each type of compound hazard across Asia. By conducting a multivariate analysis of the occurrence of these compound hazards, we identify the relationships and interactions in dry compound hazards including droughts, heatwaves, fires, and winds, ultimately leading to better-informed decisions and strategies in the natural risk management.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.25 no.6
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• pp.1-11
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• 2022

Recently, climate change has been regarded as a major cause of large-scale forest fires worldwide, and there is concern that more frequent and severe forest fires will occur due to the level of greenhouse gas emissions. In this study, the daily Keetch and Byram Drought Index (KBDI) of the Baekdudaegan in Chungcheong region including Sobaeksan, Songnisan, and Woraksan National Parks were calculated to assess effect of climate change on the forest fire potential- severity of annual maximum KBDI and frequency of high KBDI days. The present (2000~2019) and future KBDI(2021~2040, 2041~2060, 2081~2090) were calculated based on the meteorological observation and the ensemble regional climate model of the SSP1-2.6 and SSP5-8.5 scenarios with a spatial resolution of 1-km provided by Korea Meteorological Administration(KMA). Under the SSP5-8.5 scenario, 6.5℃ increase and 14% precipitation increase are expected at the end of the 21st century. The severity of maximum daily KBDI increases by 48% (+50mm), and the frequency of high KBDI days (> 100 KBDI) increases more than 100 days, which means the high potential for serious forest fires. The analysis results showed that Songnisan National Park has the highest potential for forest fire risk and will continue to be high in intensity and frequency in the future. It is expected that the forest vulnerability of the Baekdudaegan in the Chungcheong region will greatly increase and the difficulty in preventing and suppressing forest fires will increase as the abundance of combustible materials increases along with climate changes.

• Fire Science and Engineering
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• v.23 no.5
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• pp.138-142
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• 2009

The system of The Volunteer Fire Brigade is the Civil autonomic one which was set up from The Chosun Dynasty and has been active. Having suffered from several dificulties from Japanese control in the Chosun Dynasty, The Volunteer Fire Brigade was established by the enactment 1958 Fire Law and we have had it up to this time. The Volunteer Fire brigade played an important role in the period of the past Fire fighting personnel and equipment which we did not have. It has carried out the assistance of the Fire extinction, the early extinction of a fire in the rural region, the extinction of the forest fire, and lots of social volunteering actions etc. but, today's Fire fighting system has made the surprising developments, such as the improvement of national economic power, the increase of knowledge about the safety of the people, the openness of The Fire Fighting Department of Korea. I will try to check out the role of The Volunteer Fire Brigade which filled up the lacking part the fire fighting in the past and make the measures which can activate in these days, looking for the new field of the movement.

• Korean Journal of Occupational Health Nursing
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• v.22 no.3
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• pp.218-227
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• 2013

Purpose: The purpose of this study was to investigate the factors influencing health promotion behavior of fire officers in Korea. Methods: It was a descriptive study. The subjects were comprised of 104 fire officers by self-reported questionnaires from January to February 2012. The instruments used for this study were a health belief, self-efficacy and health promotion lifestyle profile II. The data were analyzed using SPSS/WIN 14.0. Results: The scores of health promotion behavior of fire officers were 2.76 (on a 4-point scale) and of health belief were 2.98 (on a 4-point scale), followed by perceived benefits at 3.45, perceived seriousness at 3.02, perceived sensitiveness at 2.82, perceived barriers at 2.23, and self-efficacy at 3.04 (on a 4-point scale). The health promotion behavior was very closely correlated with the health belief (r=0.49, p<.001). In the sub region, perceived benefit was correlated (r=0.28 p=.005) and the perceived seriousness (r=0.38, p<.001), the perceived sensitiveness (r=0.36, p<.001), and self-efficacy (r=0.55, p<.001) were correlated. Two significant variables influencing health promotion behavior of fire officer were self-efficacy and perceived seriousness (explained 41.0%). Conclusion: It suggested that self-efficacy and perceived seriousness should be considered when developing a fire officers's health promoting program.

• Journal of Physiology & Pathology in Korean Medicine
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• v.23 no.1
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• pp.1-6
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• 2009

Many of our contemporaries suffer from the symptoms of phlegm-fire, which is caused by stress, processed food, heavy diet, and unseasonal fruits and vegetables. With consultations from 'Euihaklpmoon', 'DongeuiBogham', and 'Ji-San's clinical lectures' this research, which is mainly focused on phlegm-fire, concluded as following. Phlegm-fire is caused by congestion of seven emotions, congestion of qi, complication of phlegm on fire, depletion of body fluids after long periods of disease, heavy diet, or congenital unbalance of yin-yang and qi-hyul. Concentration of phlegm-fire on the head causes headache, dizziness, frontal headache, tinnitus, and auditory dysfunction. The patient usually complains breaking pain. Dhamhwabang of Yijin-tang, Chunghoonhwadham-tang, and Yijin-tang variation for right headache can be used. Concentration of phlegm-fire on the thorax causes insomnia, palpitation, and insanity. Samhoohndham-tang variation, Chungsimgondhanhwan can be used. Concentration of phlegm-fire on the gastric region causes reflux of gastric acid, eructation, vomiting, abdominal discomfort, dysmenorrhea, and fluor gentalis. Yijin-tang variation for abdominal discomfort, Yanghyulsamul-tang, Hwadhamchunghwa-tang can be used. Shin type or Gi type, female with prevalence of qi and tendency of fire, female with dark facial color, female with raised eye tails and large noses, female with pointed noses, and male or female with large noses and mouths are likely to possess phlegm-fire. Abdominal discomfort of male with thick eyebrow and headache of Gi type female is usually caused by phlegm-fire.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.424-428
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• 2010

본 연구에서는 통계적 분석방법을 이용하여 수도권지역(서울특별시, 인천광역시, 경기도)의 화재발생 유형에 대한 분석을 통하여 체계적이고 효율적인 소방정책을 수립하기 위한 기초 자료를 확보하는데 주안점을 두었다. SPSS와 Clementine 프로그램을 이용하여 소방방재청 국가화재정보시스템의 2007년과 2008년 화재발생 자료를 대상으로 기초통계분석(교차분석, 빈도분석)을 비롯하여 의사결정트리 분석 등을 수행하였다. 분석결과로서, 수도권지역의 화재건수는 2007년 이후부터 감소하거나 유지하는 경향을 보이고 있으며, 화재유형은 50% 이상이 건축/구조물에 의한 것으로 나타났다. 또한, 인명피해를 보면 서울시는 다른 수도권지역과 달리 2007년 대비 2008년 부상자와 사망자 수가 감소하였으며, 재산피해의 경우, 서울을 비롯한 대부분의 수도권지역에서 감소한 것을 확인할 수 있었다.