• Title/Summary/Keyword: 연기 제거

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Study on the Effectiveness of Nanostructured Particles and Other Potential Materials in Clearing Smoke (나노결정입자의 연기 제거 효과 가능성 평가 및 신규 물질 검토에 관한 연구)

  • Han, Dong-Hun;Chun, Sung-Soo
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.11a
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    • pp.49-54
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    • 2008
  • 나노결정입자와 일반 입자를 이용하여 $60cm{\times}60cm{\times}180cm$의 밀폐 공간에서 연기제거 성능을 평가해보았다. MgO, $CeO_2$, $Al_2O_3$, ZnO, $TiO_2$등의 나노결정입자와 $NaHCO_3$ 등의 일반입자를 사용하였다. 실험은 입자를 30초, 1분, 2분 간격으로 연기에 분사하여 시간에 따른 연기 제거 성능을 관찰해 보았고, 아울러 3, $6\;kgf/cm^2$등의 입자 분사 압력 변화에 따른 연기 제거 성능도 평가해 보았다. 평가 결과, $TiO_2{\fallingdotseq}MgO$ > ZnO > $CeO_2$ > $NaHCO_3$ > $Al_2O_3$의 순으로 연기 제거 성능이 우수하였다. MgO와 $TiO_2$를 분사한 경우 자연스럽게 연기가 제거 되는 속도보다 약 10배 정도로 빠르게 연기가 제거되었다. 분사압력이 $6\;kgf/cm^2$에서 $3\;kgf/cm^2$로 감소하면, 입자가 연기와 부딪히는 힘이 약하고 분출양이 작아서 연기 제거 성능도 아울러 감소한 것으로 판단된다. 연기 제거 성능은 입자의 특성, 분출 압력, 분출 양, 분사 노즐의 크기 등에 영향을 받는다. 따라서 효과적인 연기제거를 위해서는 이러한 조건을 최적화하는 것이 중요하다. 본 연구는 이러한 연기 제거 입자가 실제 화재에 적용하는 것을 최종적 목표로 한다.

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Removal Efficiency of Harmful Substances in Side-stream Tobacco Smoke by the Doping Components of Commercial TiO2 Photocatalysts (시판용 TiO2 광촉매의 doping 성분에 따른 비주류 담배연기의 유해물질 제거효율)

  • Kim, Tae-Young;Cho, Yeong-Tae;Moon, Gi-Hak;Kim, Jae-Yong
    • Applied Chemistry for Engineering
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    • v.28 no.5
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    • pp.565-570
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    • 2017
  • Tobacco smoke emitted during smoking is divided into a main-stream and side-stream smoke. Most of the tobacco smoke that spreads to a room while smoking is a side-stream one. The side-stream tobacco smoke is two to three times more harmful than that of the main-stream tobacco smoke. In this study, the removal efficiency of CO, $H_2S$, $NH_3$ and HCHO in a side-stream tobacco smoke using the doping component of $TiO_2$ photocatalysts was confirmed. As a result, CO was removed up to 78.37%, which indicated that the $TiO_2$ photocatalytic process is effective for CO removal. Also, the removal efficiencies of CO, $H_2S$ and HCHO were greatly affected by the amount of doped O and Si components of the $TiO_2$ photocatalyst. In conclusion, the more doped O and Si components had, the higher removal efficiencies of harmful substances were achieved.

Smoke Removal Effect by Water Mist Spraying (미분무수 분사의 제연효과)

  • Park, Tae-Sung;Kong, Ha-Sung;Kim, Myung-Chul
    • Fire Science and Engineering
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    • v.29 no.3
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    • pp.43-47
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    • 2015
  • Water mist was sprayed on small compartment areas filled with smoke that formed from two different combustibles. The water-mist injection pressure and time were varied, and changes in the light extinction coefficient were measured over time. The smoke removal effect was analyzed with a light sensing smoke meter in different experimental conditions. Using the meter, the changes in smoke density were converted to changes in DC voltage over time to obtain the changes in the light extinction coefficient. The water mist was more effective in eliminating the smoke formed from glowing compared to flaming combustion. The smoke removal effect was significantly better with greater injection pressure and injection time.

Image-based fire area segmentation method by removing the smoke area from the fire scene videos (화재 현장 영상에서 연기 영역을 제외한 이미지 기반 불의 영역 검출 기법)

  • KIM, SEUNGNAM;CHOI, MYUNGJIN;KIM, SUN-JEONG;KIM, CHANG-HUN
    • Journal of the Korea Computer Graphics Society
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    • v.28 no.4
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    • pp.23-30
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    • 2022
  • In this paper, we propose an algorithm that can accurately segment a fire even when it is surrounded by smoke of a similar color. Existing fire area segmentation algorithms have a problem in that they cannot separate fire and smoke from fire images. In this paper, the fire was successfully separated from the smoke by applying the color compensation method and the fog removal method as a preprocessing process before applying the fire area segmentation algorithm. In fact, it was confirmed that it segments fire more effectively than the existing methods in the image of the fire scene covered with smoke. In addition, we propose a method that can use the proposed fire segmentation algorithm for efficient fire detection in factories and homes.

Smoke Detection using Region Growing Method (영역 확장법을 이용한 연기검출)

  • Kim, Dong-Keun
    • The KIPS Transactions:PartB
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    • v.16B no.4
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    • pp.271-280
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    • 2009
  • In this paper, we propose a smoke detection method using region growing method in outdoor video sequences. Our proposed method is composed of three steps; the initial change area detection step, the boundary finding and expanding step, and the smoke classification step. In the first step, we use a background subtraction to detect changed areas in the current input frame against the background image. In difference images of the background subtraction, we calculate a binary image using a threshold value and apply morphology operations to the binary image to remove noises. In the second step, we find boundaries of the changed areas using labeling algorithm and expand the boundaries to their neighbors using the region growing algorithm. In the final step, ellipses of the boundaries are estimated using moments. We classify whether the boundary is smoke by using the temporal information.

A CycleGAN-Based Image Preprocessing for Detailed Flame Detection (디테일한 화염 감지를 위한 CycleGAN 기반의 이미지 전처리 기법)

  • Subin Yu;Jong-Hyun Kim
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2023.07a
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    • pp.573-574
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    • 2023
  • 화염 영역 검출을 위해 이전 기법에서는 화재 이미지에서 연기제거 및 색상보정을 통해 이미지를 전처리하였다. 그러나 이 기법은 임계값에 영향을 많이 받고, 밝기채널을 이용하여 검출하기 때문에 밤에 일어난 화재 이미지에서는 평균이상의 퍼포먼스를 수행하지만, 주변이 밝은 대낮의 화재 이미지에서는 퍼포먼스가 줄어드는 문제가 있다. 이를 보완하고자 본 논문에서는 CycleGAN을 이용하여 낮 이미지를 밤 이미지로 바꾸어 이미지 전처리를 진행하는 기법을 제안함으로써 화염 감지의 정확도가 개선되었음을 실험을 통해 보여준다.

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1960's Acting Method of Experimental Theater (1960년대의 실험극 연기 메소드 연구)

  • Park, Ho-Young
    • The Journal of the Korea Contents Association
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    • v.9 no.11
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    • pp.184-191
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    • 2009
  • Ideas regarding acting among new theater groups In the 1960s can be summarized in two major trends. The first trend was characterized with the pursuit of identity in a play. The second trend was characterized with the pursuit of creating a play that strongly and passionately explores internal human reality. In their pursuit of the goal of the second trend, they shockingly and strongly destroyed anything by rising in revolt against the existing spatial language. They believed that acting beyond acting as pursued by Stanislavski is not to implant a new type of human, but to develop the self hidden within the actor or to remove the actor's mask. Based on such recognition, the first thing that actors have to do is to remove or break free from the shell or skin that surrounds them. Accordingly, they sought a method that helped them act while taking off their shell or mask during acting and finally got the answer from "improvisation." One thing with improvisation is its way of stimulating the unconscious world of the actors in order to allow them to strongly express the hidden instinctive emotion from deep within them.

Effect of Positive Pressure Ventilator Tilting Angle on the Flame Suppression and Smoke Density (Positive Pressure Ventilator 경사각 변화에 의한 화염억제 효율과 연기농도 변화)

  • Kim, Sung-Won;Lee, Kyoung-Duck;Shin, Chang-Sub
    • Fire Science and Engineering
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    • v.20 no.4 s.64
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    • pp.135-142
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    • 2006
  • The experiment applied Positive Pressure Ventilation to rapidly exhaust heat and smoke inside the construction in the fire was done. Changes of heat discharge and smoke density were measured, with the various blowing condition like a fan tilting angle to find the effect of the parameter. Experimental apparatus were with PPV and water mist system for better efficiency, and investigate the effect of heat discharge and smoke removal. In the experiment, flame temperature has decreased when PPV was applied. Smoke density, generated from fire also decreased dramatically and the efficiency showed the highest rate at $0^{\circ}$ tilting angle. In addition, combination of PPV and water mist system highly improved the efficiency of evacuation on heat and smoke density, clearly was influenced by the tilting angle.