• Fire Science and Engineering
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• v.19 no.4 s.60
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• pp.7-17
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• 2005

On this paper, the actual conditions of home accidents by investigating rescue and emergency reports at fire stations in Gwangju Metropolitan city and annual report on the cause of death statistics in the National Statistical Office were analyzed, and actual conditions about home accidents in developed countries were studied. As a result, the following matters were confirmed: 1) Infants and older adults are the main victims of home accidents, especially the older adults. 2) The more older adults we have in our society, the more deaths caused by home accidents take place. 3) We must study the home accident of our society in the level of developed countries. And we must have the prevention policy about the home accidents.

• Nuclear Engineering and Technology
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• v.52 no.12
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• pp.2803-2811
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• 2020

With the aging of nuclear reactors, embrittlement of the reactor pressure vessel (RPV) steel, as a consequence of routine operations, is highly probable. To ensure operational integrity and safety, prediction and mitigation of compromising damage, brought on by pressurized thermal shock (PTS) following an emergency procedure, is of utmost importance. Computational fluid dynamics (CFD) codes can be employed to predict these events and have therefore been an acceptable method for such assessments. In this paper, CFD simulations of a density driven ECC state in the ROCOM facility are analyzed. Obtained numerical results are validated with the experimental measurements. Considerable attention is attributed to the boundary conditions and their influence, specifically outlet definitions, in order to determine and adequately replicate the non-active pumps in the facility. Consequent analyses focused on initial conditions as well as on the temporal discretization and inner iterations. Disparities due to different turbulent modelling approaches are investigated for standard RANS models. Based on observed trends for different cases, a definitive simulation setup has been established, results of which have been ultimately compared to the measurements.

• The Korean Journal of Emergency Medical Services
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• v.15 no.3
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• pp.81-96
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• 2011

Purpose : The purpose of this study was to analyse early childhood teachers' perspectives and actual conditions of earthquakes and tsunami safety education. Methods : A total of 119 teachers were recruited from kindergarten and child-care center located in J city, all of whom gave consent to take part in these research. The data have been collected for 45 days from May to July in 2011. The data was analyzed by SPSS (version 17.0) and chi-square test. Results : The results of this study are summarized as follow. 1. 97.5% of the subjects considered earthquakes and tsunami safety education necessary, however, only 34.6% of them were given the education related to earthquakes and tsunami. 2. 63.9% of the early childhood teachers provided children in the kindergarten or childhood center with earthquakes and tsunami safety education, however, 30.3% of them were found to be without any experiences of earthquakes and tsunami safety education. 3. 68.5% of the teachers were informed earthquakes and tsunami safety knowledge. 4. 35.0% of respondents answered that the single session of earthquake and tsunami education was not efficient, thus expecting to receive continuing education. Conclusions : The study suggested that more teachers necessarily provide earthquake and tsunami safety education to reduce children's mortality rate in earthquakes and tsunami. The education program should be developed and systematized to improve teacher's knowledge. Moreover, the program should be continuously provided to teachers and children in the kindergarten or childhood center.

• The Korean Journal of Emergency Medical Services
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• v.13 no.1
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• pp.97-114
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• 2009

Purpose : This study was performed to identify the knowledge and educational wants for first-aid and its related factors of senior students in elementary schools. Methods : From July 11-25, 2008, this study surveyed 437 elementary school students using a structured questionnaire. Result : Of the study subjects, 47.6% of the subjects had experienced first-aid conditions 25.4% had injuries, 11.0% had indigestion, 10.5% had sprains, 6.2% had acute abdominal pains, 5.9% had brash, and 5.7% had fractures. The experience rates of first-aid conditions were significantly different according to gender, mothers' educational status, means of school attendance and amount of exercise. The experience rate of first-aid education was 71.4%. There was a significant difference with grade, and school reports. They had education about cardiopulmonary resuscitation (52.5%), injury treatment and desmology(48.7%) in a good order. The score of knowledge about first-aid was $13.95{\pm}4.1$ and it was converted on the basis of 100 points, the results were below 50points, and there was a significant difference in grades. Educational wants for first-aid was 64.3%, and as a result of multi-logistic regression analysis of characteristics relating to educational wants, there was a significant difference between gender, grade, mothers' educational status, and amount of exercise. Conclusion : The rate of first-aid experience of elementary school students was high, but as their recognition and knowledge on first-aid was low, the importance of first-aid education and educational wants should be reflected for practical and organized education.

• Fire Science and Engineering
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• v.29 no.5
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• pp.79-87
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• 2015

The placement of Korean fire-fighting administrative power in urban areas shows regional unbalance. In an ideal system, all citizens would be provided with equal fire protection and rescue services, but this is usually difficult to realize due to regional conditions or budget problems. In the case of Busan Metropolitan City, we deduced that it is impossible for half of the buildings to receive rescue services within 5 min, and the conditions are much worse for areas with long or wide fire-fighting service regions. The approach vulnerability for the existing emergency rescue squad locations was assessed. The results revealed that if a rescue team's location is shifted, the improvement effect will be virtually insignificant because of their geographical position. Therefore, this study suggests the establishment of additional rescue squads. It is proven that adding 5 rescue centers in the following locations could solve the problem of approach vulnerability: Bukbu, Gangseo, Geumjeong, Gijang, and Haeundae, in order of effectiveness. The number of buildings in the areas is 53,546.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.175-182
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• 2011

This study proposes CAOPI(Computer Aided Organ Prediction Index) system based on APACHE II(Acute Physiology And Chronic Health Evaluation) for classifying disease severity and predicting the conditions of patients' major organs. The existing ICU disease severity evaluation is mostly about calculating risk scores using patients' data at certain points, which has limitations on making precise treatments. CAOPI system is designed to provide personalized treatments by classifying accurate severity degrees of emergency patients, predicting patients' mortality rate and scoring the conditions of certain organs.

• Fire Science and Engineering
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• v.23 no.3
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• pp.1-10
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• 2009

This paper presents a study on the evacuation analysis in underground arcade. In this study, the effect of the exit with a windbreak door has been investigated by using evacuation simulation program (building EXODUS). Also, the simulation has included the impact of smoke, heat and toxic gases by fire simulation program (CFAST). The results were obtained for the conditions of without and with door of the two exit with 1,088 evacuation population. As a results, for non-fire evacuation, there was only a little difference of evacuation time for both conditions. However, for fire emergency evacuation, the evacuation time for the condition with door increased more 110 seconds than for the condition without door. When the auto door not opened, the evacuation time was increased more 670 seconds than for the condition without door. Consequently, in case of fire, the automatic door should be operating by the signal of fire detector and keep open when the fire accidents. To lead the evacuees well to the escape route the luminaries for an emergency exit sign have to be reinforced to the wall and floor around the exit.

• Fire Science and Engineering
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• v.23 no.3
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• pp.93-102
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• 2009

Recently, the number of child care facility and social demand for high quality child care service increase suddenly. Especially, social atmosphere about fire safety is more sensitive in Korea. The majority of the residents in a child care facility are composed of early childhood having difficulty to evacuate, and therefore the number of stories of a building and the appropriateness of a evacuation equipment play an important role in the evacuation safety. In this study, problems and improvements for the evacuation safety are dealt with the present conditions of child care facilities, the comparative analysis between domestic and foreign standards, the research on the actual condition of evacuation equipments, and so on. The study brings to a conclusion that it is necessary to systematize the regulations regarding fire safety, to connect fire-fighting facilities for design standards and operations of emergency preparation equipments, to improve the regulations for fire protection system such as the sprinkler system, and to restrict the facilities having fire hazards.

• Nuclear Engineering and Technology
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• v.53 no.5
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• pp.1436-1445
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• 2021

To obtain the dynamic characteristics of reactor secondary circuit under transient conditions, the system analysis program was developed in this study, where dynamic models of secondary circuit were established. The heat transfer process and the mechanical energy transfer process are modularized. Models of main equipment were built, including main turbine, condenser, steam pipe and feedwater system. The established models were verified by design value. The simulation of the secondary circuit system was conducted based on the verified models. The system response and characteristics were investigated based on the parameter transients under emergency shutdown and overload. Various operating conditions like turbine emergency shutdown and overspeed, condenser high water level, ejector failures were studied. The secondary circuit system ensures sufficient design margin to withstand the pressure and flow fluctuations. The adjustment of exhaust valve group could maintain the system pressure within a safe range, at the expense of steam quality. The condenser could rapidly take out most heat to avoid overpressure.

• Journal of the Korean Society of Systems Engineering
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• v.16 no.2
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• pp.97-109
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• 2020

On March 11, 2011, an earthquake followed by a tsunami caused an extended station blackout (SBO) at the Fukushima Dai-ichi NPP Units. The accident was initiated by a total loss of both onsite and offsite electrical power resulting in the loss of the ultimate heat sink for several days, and a consequent core melt in some units where proper mitigation strategies could not be implemented in a timely fashion. To enhance the plant's coping capability, the Diverse and Flexible Strategies (FLEX) were proposed to append the Emergency Operation Procedures (EOPs) by relying on portable equipment as an additional line of defense. To assess the success window of FLEX strategies, all sources of uncertainties need to be considered, using a physics-based model or system code. This necessitates conducting a large number of simulations to reflect all potential variations in initial, boundary, and design conditions as well as thermophysical properties, empirical models, and scenario uncertainties. Alternatively, data-driven models may provide a fast tool to predict the success window of FLEX strategies given the underlying uncertainties. This paper explores the applicability of Artificial Intelligence (AI) to identify the success window of FLEX strategy for extended SBO. The developed model can be trained and validated using data produced by the lumped parameter thermal-hydraulic code, MARS-KS, as best estimate system code loosely coupled with Dakota for uncertainty quantification. A Systems Engineering (SE) approach is used to plan and manage the process of using AI to predict the success window of FLEX strategies under extended SBO conditions.