• Journal of the Society of Disaster Information
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• v.19 no.3
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• pp.608-623
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• 2023

Purpose: Recently, the number of logistics warehouses has been on the rise. In addition, as the number of such logistics warehouses increases, number of fire accidents also increases every year, increasing the importance of preventing fires in large logistics warehouses. Method: investigated aspirating smoke detectors that are emerging as adaptive fire detectors in logistics warehouses. Then, through fire simulation (FDS), logistics warehouse modeling was conducted to compare and analyze the detection speed of general smoke detectors and aspirating smoke detectors according to four stages of fire growth and three locations of fire in the logistics warehouse. Result: Growth speed in Slow-class fires and Mediumclass fires, the detection speed of aspirating smoke detectors was faster regardless of the location of the fire. However, in Fast-class fires and Ultra-Fast-class fires, it was confirmed that the detection speed of general smoke detectors was faster depending on the location of the fire. Conclusion: It was confirmed that the detection performance of the aspirating smoke detector decreased as the fire growth speed increased and the location of the fire occurred further than the receiver of the aspirating smoke detector. Therefore, even if an aspirating smoke detector is installed in a warehouse that stores combustibles with high fire growth rates, it is judged that an additional smoke detector is attached far away from the receiver of the general smoke detector to increase fire safety.

• Fire Science and Engineering
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• v.19 no.1 s.57
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• pp.99-103
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• 2005

This study is the mono signal detector and the multitype detector of mono signal On/Off circuit type. The multi functional base circuit focused on which is made of compatible with exiting fire detector base. The multi functional base circuit generates two fire signals at the same time, so it can link the existing fire alarm system with security system. The base circuit is easily able to be connected to exiting HA or OA facilities, having stability and reliability. As a result of the study, the multi functional base circuit has met the acceptance criteria of related national standards. Also, the security system of input signal can contribute to the smallest loss of lives and the property.

• Fire Science and Engineering
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• v.30 no.5
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• pp.108-115
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• 2016

Fire detectors play an important role in alerting the related people to the initial stages of fire to protect assets and life. Therefore, the performance in detecting fires in the early stages without the risk of false alarms is important. Owing to a recent revision of the national fire safety standards to install smoke detectors in living rooms used for sleeping, staying, hospitalizing in apartment house/efficiency apartment/lodging facility/medical facility/facility for elderly and young, the application of smoke detectors is increasing. On the other hand, there is lack of research in preventing false alarms. This study improved algorithms to prevent false alarms in analog photoelectric smoke detector's due to sudden dust and better classify pollution and fire signals through a self-compensatory function. Through this study, alternatives are suggested to reduce the number of false alarms of Analog Photoelectric smoke detectors, and prevent financial losses due to false alarms.

• Fire Science and Engineering
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• v.16 no.4
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• pp.28-32
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• 2002

The performance based design in fire detection system, the effect of high airflow and dilution of smoke produced in any fire situation serve to increase the response time of point-type smoke detectors. This study investigated the smoke density of ceiling, under the air stream and in normal status when fire type is smoldering fires. The result of study, smoke generated in the fire was swept away from nearby spot type smoke detector which failed to actuate because dispersed in diluted form around the room. The concept of performance based design in fire detection system of protected area influenced by high airflow provided the need of active fire detection system such as air sampling smoke detection system.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2002.05a
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• pp.82-87
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• 2002

지금까지의 화재감지시스템은 하나의 입력요소에 대하여 화재, 비화재로 판단하는 단순한 형태의 신호를 발신하여 하나의 요소로만 화재를 판단하여 왔다. 또한 기존의 화재감지시스템은 화재 시에 발생되는 열, 연기, 불꽃 등에 대하여 감지기회로에서의 미리 지정한 고정값과의 비교를 통하여 정해진 기준을 넘을 경우 화재로 판정한다. 그러나 고정값을 기준으로 신호를 발신하게 되어있는 화재감지기의 동작은 상황에 따라 불확실한 경우가 발생한다.(중략)

• Fire Science and Engineering
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• v.23 no.4
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• pp.98-103
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• 2009

In this paper, in order to analyze the response characteristics of the smoke detectors which is suitable with the residential fire detector, the paper fire and flammable liquid fire experiment came to be accomplished according to UL Standard for safety for smoke detector for fire alarm signaling systems, UL 268. Also Photoelectric smoke detector, the Analog smoke detector and the single station alarm device came to be used with the specimen and the response characteristics of the smoke detectors which follows in these two types(paper, flammable liquid) test fire came to be analyzed. As a result, according to test fire there was some difference to response characteristics of the smoke detectors.

• Fire Science and Engineering
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• v.34 no.4
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• pp.36-44
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• 2020

It is necessary to predict the activation time of fire detectors accurately to improve the reliability for evaluating the required safe egress time (RSET) in performance-based fire safety design. In this study, problems of the plunge test, which is widely applied in assessing fire detectors, were examined through experiments and numerical simulations. In addition, a new shield-cup test method was proposed to address these problems. A fire detector evaluator (FDE) developed in a previous study was applied to ensure measurement accuracy and reproducibility. During the plunge tests, a significant measurement error was observed in the activation time of the smoke detector because of the rapid flow change when the detector was input. However, during the shield-cup tests, slight changes occurred in the flow inside the FDE when the detector as exposed to smoke. In conclusion, the proposed shield-cup test method is expected to be useful for evaluating the response characteristics of fire detectors more accurately in simulated fire environments.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.96-101
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• 2010

본 연구에서는 터널 내부에서의 화재 사고 시 화재를 자동으로 조기 발견 경보하여 화재 초기에 대응력을 확보시킬 수 있게 하는 화재 감지기의 성능 평가를 위해 터널 내부에서의 실물 화재 실험을 실시하였다. 실물화재실험은 일반적으로 도로 터널에 적용 중인 공기관식, 반도체식 감지기를 대상으로 "도로터널 방재시설 설치지침(2004, 건설교통부)"의 터널 내부의 화재 감지기 성능 실험 기준에 따라 메탄올을 이용한 풀버너와 소형 승용차를 이용하였다. 실험결과 메탄을 풀화재(단면적 $4m^2$)의 경우 약 36초 안에 모두 화재를 감지하였으며, 실물자동차화재실험의 경우는 1분 이내에 모두 화재를 감지하는 결과를 나타내었다.

• Fire Science and Engineering
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• v.17 no.2
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• pp.6-9
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• 2003

Recently, forced ventilating air conditioning system has been widely used in modern buildings. However, It is obvious that this kind of system may affect on the response of fire detectors at real fire incidents, especially, on the ionization smoke detector, which is critically influenced by air stream. Therefore we studied to verify the response characteristics of air stream by ionization smoke detector for the design of facilities in practice. In this study, experiments were executed to examine the correlation between air velocity and the ionization detector's responses with var-ious air velocity and smoke densities in the simulated test room. As a result of experiments, ionization detector's operating time is in reverse proportion to air velocity. And the detector shows more sensitive reaction when the velocity of smoke stream increase over 60 cm/s. In addition, it was shown that ionization smoke detector is more sensitive to smoldering fires in paper than that in petro-chemicals.

• Journal of the Korea Society of Computer and Information
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• v.16 no.4
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• pp.43-52
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• 2011

With the rapid development of technology, skyscrapers are widely spread and they are tightly coupled. If fire occurs in a building, it is easily spread to neighboring buildings, resulting in the large number of victims and property damages. To remove fire disasters, the need for early fire detection techniques is increasing. To detect fire, detecting devices for heat, smoke, and flame have been used widely. However, this paper surveys and presents the latest research which focuses on early smoke and flame detection algorithms and systems with camera's input images. In addition, this paper implements and evaluates the performance of these flame and smoke detection algorithms with several types of movies.