• The KSFM Journal of Fluid Machinery
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• v.18 no.1
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• pp.5-10
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• 2015

The "Ondong tunnel" is not used now where is one of the tunnels in the Janghang line which is from Cheonan to Iksan. The length of the tunnel is 214 m. The location of the fire source is center of the tunnel and the pool fire with heptane is for the fire source. Tests are carried out for the various fire sizes, the height and obstructed/open condition of the fire source. Temperature on the top of the tunnel is measured. Even if the fire size is same, the maximum temperature on the ceiling of the tunnel for the elevated fire source is very larger than the maximum for the ground fire source. As the fire size is lager the maximum temperature on the ceiling is higher. These test results can be very useful for design and guidelines of fire detectors in tunnels.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.04a
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• pp.325-331
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• 2007

• Proceedings of the SAREK Conference
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• 2008.11a
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• pp.89-94
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• 2008

In this study it was evaluated that hybrid air conditioning and ventilation system to reduce energy consumption and keep on comfortable indoor environment in an underground shopping center. Room temperature by hybrid HAVC system was controled as $1.8{\sim}2.1^{\circ}C$ low and indoor humidity was controled as $4.1{\sim}5.0%RH$ low, and response was fast in $2.0{\sim}2.5$ times compared with conventional system. And also transportation efficiency of hybrid HVAC system was improved in about 27%, and total energy consumption rate of hybrid HVAC system is decreased in 16% compared with conventional system.

• Safety and Health at Work
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• v.5 no.3
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• pp.161-164
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• 2014

Obesity is a significant problem affecting United States (US) firefighters. While body mass index (BMI) is widely used to diagnose obesity, its use for this occupational group has raised concerns about validity. We examined rates and types of misclassification of BMI-based obesity status compared to body fat percentage (BF%) and waist circumference (WC). Male career firefighters (N = 994) from 20 US departments completed all three body composition assessments. Mean BMI, BF%, and WC were $29kg/m^2$, 23%, and 97 cm, respectively. Approximately 33% and 15% of BF%- and WC-defined obese participants were misclassified as non-obese (false negatives) using BMI, while 8% and 9% of non-obese participants defined by BF% and WC standards were identified as obese (false positives) using BMI. When stratified by race/ethnicity, Pacific Islanders showed high rates of false positive misclassification. Precision in obesity classification would be improved by using WC along with BMI to determine firefighters' weight status.

• Fire Science and Engineering
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• v.33 no.1
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• pp.138-146
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• 2019

The present article reports the results of a basic study for improving the fire safety of postpartum care centers. In the case of postnatal care center facilities, newborn babies and mothers reside 24 hours a day, and as they are located in high-rise and multi-use facilities, measures for fire safety are necessary, but there are no domestic manuals. This study examined the problems of fire safety through an analysis of fire cases of postpartum care facilities and related regulations, and conducted surveys on the fire safety consciousness of employees and mothers regarding postpartum care management. The fire safety consciousness of the mother was analyzed.

• Journal of Hydrogen and New Energy
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• v.18 no.4
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• pp.374-381
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• 2007

In order to verify the feasibility of expansion of back-fire limit equivalence ratio in the hydrogen-fueled engine with external mixture, the characteristics of performance and combustion are experimentally analyzed with change of intake/exhaust valve timings under the fixed valve overlap period of $0^{\circ}$ CA(non-valve overlap period). These characteristics are also tested for the change of exhaust valve closing timing while intake valve opening timing is fixed to clear the main cause of back-fire occurrence. As the results, the less valve overlap period center is retarded, the more back-fire limit equivalence ratio increases and back-fire does not occurred after TDC. In addition, it was shown that the control of back-fire is dependent on intake valve opening timing than valve overlap period.

• Journal of the Korean Society of Industry Convergence
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• v.27 no.4_2
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• pp.861-868
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• 2024

The COVID-19 pandemic poses a serious threat to health and safety worldwide, significantly adding to the work burden of fire officials. Fire officials experience high levels of physical and mental pressure in various situations, and such stress can lead to psychological exhaustion. The goal of this study is to investigate the level of psychological exhaustion among fire officials according to gender, age, and years of service and specific roles. In this study, a questionnaire survey was conducted on fire officials in various regions of Korea, and the degree of psychological exhaustion by position was analyzed. The results indicated a difference in the level of psychological exhaustion across different roles, such as fire suppression, rescue, and emergency services. In particular, paramedics exhibited higher levels of psychological exhaustion compared to those in rescue, fire suppression, and administrative roles. This study contributes to identifying specific measures to improve the mental health of fire officials and emphasizes the need for differentiated stress management and support programs tailored to each role. Based on the results, this research provides foundational data to address the mental health issues of fire officials and will contribute to future research and policy development.

• Journal of the Korean Society of Safety
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• v.19 no.3 s.67
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• pp.9-13
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• 2004

To confirm the previous finding that FDS predicts a fire growth rate too rapid compared with an experiment in a center fire in a room with an opening, the same computational fluid dynamics was applied to two types of fires, wall fire and comer fire. First the grid size was chosen to eliminate possible numerical errors due to a coarse grid system. Then the two types of fires were simulated for three different fire sizes, 7.65, 21.25, and 51.57kW for each type, which are the same as in the experiment to be compared with. The fires were predicted to grow too fist although the average temperatures and heights of the neutral planes were in good agreement with measurement.

• Fire Science and Engineering
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• v.26 no.6
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• pp.78-84
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• 2012

In this study, we have conducted a fire resistance experiment under loading condition on standard fire to evaluate the fire resistance performance according to applying reinforcement of methods for reinforcing the lateral confinement of reinforced bars (Wire Rope) and fire resistance reinforcement (Fiber-Cocktail) for 100 MPa high strength concrete column. In the result of the experiment, in case of the test objects applied by hoop, it has been shown as not possible to be applied as the fire resistance structure after satisfying the fire resistance performance for 43 minutes. In case of applying the wire rope as lateral confinement of reinforced bar, instead of hoop in identical volume ratio, it has been shown as possible to apply it to the buildings with under 4 floors after satisfying the fire resistance performance fro 69 minutes with any separate fire resistance process. Also, in case of applying with mixing wire rope method, instead of hoop, and Fiber-Cocktail mix method to prevent spall, it has been shown as possible to apply to the buildings with over 12 floors after satisfying the fire resistance performance for 180 minutes.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.11a
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• pp.219-224
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• 2007