Earticle

Fire investigation is an important activity that investigates the cause and process of fire occurrence and develops prevention and response measures. However, it takes effort and time to conduct actual fire investigation and reproduction experiments and verification is difficult. Therefore, in this study, we intend to test the reliability of fire investigation results using a fire simulation program that simulates an actual fire. As a result of comparative analysis of domestic actual fire investigation results and fire simulation simulation results, the suitability of the fire investigation to the objective investigation results was evaluated and after a verification process, the reliability of the fire investigation could be confirmed in advance and a conclusion could be drawn, so the accuracy of the fire investigation played a major role in raising the Through this study, The accuracy and efficiency of fire investigations will be improved and provide useful guidelines and system improvement data to experts and government agencies related to fire prevention and policy.

The August 4, 2020 explosion in Beirut port, Lebanon, was a national level catastrophe. Ammonium nitrate is at the center of this accident, as revealed by the accident investigation and fire investigation at the UN/OECD level. Ammonium nitrate is classified as First-class oxidizing soilds, ‘nitrates’, under the Act on the safety control of dangerous substances and is managed with a ‘specified quantity of 300kg’ and classified as Third-class oxidizing solids, under global standards such as UN GHS and TDG. The purpose of this study is to analyze the mechanisms of major accidents by ammonium nitrate, research ammonium nitrate safety management systems in major countries, and compare the oxidizing hazard of ammonium nitrate by use types. Through this study, it is expected that it can be used as basic data to understand the type of fire caused by ammonium nitrate when identifying heat source or fire mechanism at the fire site because it is widely used in our daily lives without being aware of it.

When the neutral conductors ares floated from the three-phase four-wire distribution power system, the three-phase voltage is distributed to the single-phase load device connected to the system in proportion to the impedance. An over-voltage is applied to a single-phase load device with a high internal impedance, and a fire may occur due to deterioration of an internal device of the load devices to which the over-voltage is applied, or dielectric breakdown of a coil or wire insulation coating. Therefore, in this study, the heating characteristics that appear in the process of applying an unbalanced voltage due to the departure of the neutral line and the risk of ignition through electrical signal analysis were confirmed with two types of load devices installed in the three-phase four-wire distribution system.

There are not a few fire accidents occurring around us, and fire types are also occurring in various ways. Among the various fire accidents, this study tried to find out about fire accidents related to portable butane gas. Portable butane gas, which is most commonly used by many people around (home, general restaurant, outdoor, etc.), has established itself as an essential cooking utensil in Korea. Because of the high frequency of use, it is not uncommon for accidents to occur. So, in this study, I became interested in the safety of the portable butane gas burner, which has been firmly established as a cooking utensil, and at the same time reached the stage of confirming its danger through empirical experiments. Therefore, we investigated what factors could cause a fire accident when using a portable butane gas cooker, such as using an excessive fire plate, and conducted a numerical analysis of the risk through a verification experiment tailored to it. As a result, it was found that the risk of explosion of butane gas due to negligence in use still exists.

Waste organic solvents are designated waste discharged after use at workplaces, and about 90% are generated by manufacturing, followed by sewage, waste treatment, raw material regeneration and environmental restoration, transportation, and professional, science, and technology services, and the generation and recycling rate of waste organic solvents are increasing every year. As a result, the number of fires and accidents at recycling companies for waste organic solvents is also increasing, and fires are occurring due to various causes such as carelessness (welding and cutting operations) and chemical factors (natural ignition, horn ignition, etc.). In addition, if a fire occurs, it may lead to a large fire accompanied by an explosion, and it is a great threat to the safety and health of citizens because it generates a large amount of harmful chemicals harmful to the human body. Therefore, this study was conducted to contribute to the prevention of fire and explosion accidents caused by waste oil solvents and to suggest ways to improve fire-related identification techniques and systems through the risk study and fire cases.

When point of origin was not directly photographed by the CCTV camera, but reflection image reflected on a reflector was photographed, a formula for estimating point of origin using the reflection law of light and the trigonometric function was derived. At this time, three data to be collected are basically required: CCTV camera height(H), height of reflective image(h), and horizontal distance between the CCTV camera and reflective image(d). In addition, the horizontal distance between point of origin and reflective image(d') and the height of point of origin(h') are also required, but if we know one of these two, we can know the other through the formula. In other words, if we know the horizontal distance between point of origin and reflective image(d′), we can know the height of point of origin(h′) through Formula 2, and if we know the height of point of origin(h′), we can know the horizontal distance between point of origin and reflective image(d′) through Formula 3. The significance of this formula is an indicator of the direction of where point of origin is. In addition, it can also be used as a tool to verify whether the location presumed to be point of origin is correct.