• Proceedings of the KSR Conference
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• 2006.11b
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• pp.207-212
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• 2006

In this study we conducted computer simulation with FDS V4.0.5 for the subway carriage of Seoul Metro to the replacement of interior materials. We tried to use the real data for the simulation by testing the interior materials in our Lab. From the result of the simulation we could confirm the fire resistance of the new interior replaced car to the chosen arson scenario case.

• Journal of Korean Institute of Fire Investigation
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• v.9 no.1
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• pp.61-64
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• 2006

지난 2005년 8월 18일 대전광역시 중구 문화동 가옥에서 발생한 화재를 사례로 하여 현재 발생되고 있는 보험범죄의 잔인하고 반인륜적인 모델을 제시하였다. 동 사례는 일가족 4명이 화재로 인하여 사망하였으며, 초기에는 전기누전에 의한 단순한 화재로 오인되었으나, 현장의 정밀감정, 소사체의 정밀 부검 및 면밀한 수사를 통하여 보험금을 노린 살인 방화사건으로 밝혀진 사례이다. 본 고찰에서는 화재현장의 상황, 가옥 내부의 연소형태, 전기적인 특이점, 연소매개체, 피의자의 행위, 연소지연시간의 발생 및 수사 자료를 근거로 제시하고, 종합적으로 고찰하여 일가족 4명을 살해한 후, 시너를 연소매개체로 사용한 방화에 의해 화재가 발생한 것으로 판단한 사례이다.

• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.1205-1208
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• 2006

Today, our city structure is being complicated from the development of industry. Invisible losses, life and fortune loss caused by arson is embossed in our society. The preparation of counter plan about increasing factors of fire damage is not easy. With respect to mankind life, however, it is very important. Therefore, the focus of this research examine refuge degree in each smoke density level when a fire break out in the space. I evaluated auditory guide facility thorough real scale test. In this thesis, I will propose the efficient refuge deriving facilities.

• Analytical Science and Technology
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• v.34 no.5
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• pp.231-239
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• 2021

Detection of fire accelerants from fire residues is critical to determine whether the case was arson or accidental fire. However, to develop a standardized model for determining the presence or absence of fire accelerants was not easy because of high temperature which cause disappearance or combustion of components of fire accelerants. In this study, logistic regression, random forest, and support vector machine models were trained and evaluated from a total of 728 GC-MS analysis data obtained from actual fire residues. Mean classification accuracies of the three models were 63 %, 81 %, and 84 %, respectively, and in particular, mean AU-PR values of the three models were evaluated as 0.68, 0.86, and 0.86, respectively, showing fine performances of random forest and support vector machine models.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.431-433
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• 2021

In this paper, abnormal behavior monitoring system using YOLO AI platform was implemented and had superior response characteristics compared to the conventional monitoring system using two-shot detection by using one-shot detection of YOLO system. The YOLO platform was trained using image dataset composed of abnormal behaviors such as assault, theft, and arson. The abnormal behavior monitoring system consists of client and server and can be applicable to smart cities to solve various crime problems if it is commercialized.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.6
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• pp.143-151
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• 2014

Recently, as smartphones are widespread, a variety of user's information is created and managed in smartphones. Especially the location information can show the user's position at a specific time and the user's area of interest, which could be very useful during criminal investigation. Although the location information plays an important role in solving the crimes such as serial murder, rape and arson cases, there is a lack of research on location information for digital forensics. In this paper, we analyze the location information from logs, images, and applications on android, and we suggest the integrated model for analyzing location information. The proposed model may be useful in criminal investigation by improving the efficiency of data analysis and providing information about a criminal case.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.30 no.9 s.252
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• pp.1148-1153
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• 2006

This paper deals with the effect of the direct heating method(DHM) for straightening the micro wire. Straightened micro wires have been widely used in the fields of the medicine and the semi-conductor. We have developed a micro wire straightening system by using the direct wire heating method. To controling the tension of the micro wire during the heating and straightening process, a precision tension sensor was set up. In order to avoid the surface oxidation during the heating process, the argon inert gas was supplied to the vicinity of the wire. And, this paper shows the correlation between the tension and the current when arson gas supplied to the tungsten wire. Through several experiments, the optimal tension and current were found. Also, higher straightness $({\approx}1{\mu}m/1000{\mu}m)$ and roundness$(<{\Phi}{\pm}2{\mu}m/100{\mu}m)$ founded when $500{\mu}600gf$ tension and 1.5 ampere.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.11a
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• pp.473-476
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• 1997

Focused Ar ion laser beam can be utilized to fabricate microstructures on silicon substrate as well as other materials(e.g. such as ceramic). The laser using in this study is an argon ion laser with maximum power of 6 W, wavelength of 514 nm. This laser beam is focused by objectives with a high numerical aperture, a long working distance. We have achieved line width about 1 ${\mu}{\textrm}{m}$ with high scan speed. The resolution for Si machining is determined by the selectivity of the chemical reaction rather than the laser spot size. In this study, we have obtained the maximum etch rate of 434.7 ${\mu}{\textrm}{m}$/sec with high aspect ratio. The characteristics of etched groove was investigated by scanning electron microscope(SEM) and auger electron spectroscopy(AES). It is assumed that the technique using arson ion laser is applicab1e to fabricate microstructures.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.36 no.2
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• pp.63-70
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• 2020

In the ancient Buddhist temple area, various metal artifacts are still excavated. Therefore, the aim of this study is to approach the characteristics of ancient architecture through ancient metal artifacts. First, metal decoration of ancient architecture appears for the purpose of structure, decoration, arson. Then, as the method of wood structure is developed, the application is separated into structural, functional and decorative purposes. In ancient times, metal decoration has reduced the role of structure, but its decorative role has expanded. Second, various metallic ornaments were used on the roof of ancient architecture. As the wooden technology developed, the metal decoration was gradually omitted while applying the curve to the roof. Third, the metal ornaments used on the roof of ancient architectures include the ridge central decoration, roof top decoration, a nine-ring decoration, gable board Ornamental Metal, corner flower decoration, eaves nail, wind bell. And subsequent research requires a terminology that can link the results of archeology and Buddhist art through excavation as a result of architecture.

• Fire Science and Engineering
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• v.26 no.6
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• pp.85-91
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• 2012

To reduce human life and property damage at the fire in a building, it is most critical to control flame spread in the early stage. Fire spread prevention measure generally includes fire resistance performance securing of structure member in the arson zone and use limitation based on combustion performance of finishing material. The latter is most fundamental fire safety design to determine flame spread, but domestic combustion test determines combustion performance by specimen sized fire test method. Thus, there are many restrictions in the determination of combustion performance by composite material such as sandwich panel. Especially, outer finishing material uses a variety of composite material such as dry bit, aluminum composite panel, and metal panel compared to inner finishing material. Therefore, this study would determine vertical fire spread features by a full scaled fire experiment through the test method of ISO 13785-2, an international test standard.