Earticle

Finding a fire point at a fire site is the first and most important step in identifying the cause of the fire. Ignition point means the room or area where the fire started. This means the exact physical position in which heat sources and combustibles come into contact with each other and start the fire. Ignition point in fire investigation is a very important point of investigation in deducing the cause of fire and securing evidence. But the reality is that building such as sandwich panel, structural steel and concrete, when fully burned, are hard to find not only the ignition point but also the direction of combustion. The ignition point was estimated through elemental analysis of scientific building materials instead of the subjective identification method of individuals. The purpose of this study is to test the combustion characteristics of sandwich panels and to present the possibility of ignition point estimation by experimenting with burnt tissue of sandwich panels in several ways.

In this study, we studied the application usefulness of a wired drone system capable of obtaining power and data and communication relay in order to prepare for release of control rights due to power cut off or damage to repeaters in disaster areas due to disasters or because there are no relays in mountainous areas or at an altitude of 150m or higher. In order to temporarily connect the repeater developed using the 800MHz band of LG U+ domestic telecommunications company to nearby available base stations and restore the communication network, it is mounted on a wired drone system that can take off at an altitude of 20m and fly for more than an hour to strengthen canceller characteristics and delay time. For the analysis, a wired drone system and a drone-mounted repeater were manufactured to maintain an altitude of 20m for more than an hour, and a small drone-mounted repeater secured stable communication quality around 500m. Shrinkage was tested. Therefore, as a follow-up study, the evaluation of securing the right to control by linking the wired communication repeater drone system with the disaster drone is proposed.

The electrical fire is one of the high rates among fire occurences. The electrical fire is reported as the highest rate with 23% of total fire occurence rate, and the industrial facility fire is known as the second highest rate with 17.3% of total fire rate. This study is focused on the development of more effective self triggered fire extinguishing system to protect the fire of high value facility and equipment such as electrical distributed system. The fire extinguishing raw material is the condensed aerosol which does not yield the corrosion and fault of fire equipments and facilities. The fire at the supply system of electricity such as electrical distributed system produce the large loss of not only the whole system but also the other fields relating to the distributed system. The electrical system therefore should be guaranteed for both safety and supply capacity together with the fire occurrence and earthquakes. It is accordingly to be triggered for fastest fire suppression and prepared for the minimum loss at the emergent situation. Based on these circumstances the fire extinguishing system of condensed aerosol has been known for the very effective measure particularly at the small size of enclosure. The self triggered system of condensed aerosol must however have the requirement of fast response capability. The heat type fire extinguishing system has not been enough to sense the total thermal value inside the enclosure. This paper is therefore to describe the advancement of self triggered smoke type extinguishing system of aerosol including more accurate and fast capability. The developed smoke type system provide the fast automatic suppression method with accurate test results for the electrical distributed system.

Research was conducted to obtain a fire investigation database by observing the evolution of lithium ion batteries and debris according to each solvent. Hot water, room temperature water, water with ice, and water with dry ice are placed in each tank, a torch is used to activate a fully charged 18650 lithium-ion battery, then each tank is placed on fire. As a result of the study, the lower the temperature, the shorter the extinguishing time, the time taken for extinguishing, the temperature difference before and after the experiment, the percentage of residual value of lithium ion, the remaining battery after runaway, whether or not an explosion occurred during the fire, the duration of the explosion, and the residual value in the wreckage increased, and it was confirmed that the fire suppression time and the residual rate in ice water were high.