• Feed Journal
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• v.2 no.10
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• pp.110-113
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• 2004

계사의 환기량 기준에 유해가스 농도의 조절을 위한 환기량 기준은 없다. 그 까닭은 적정하게 환기(Proper Ventilation)가 이루어지면 유해가스도 허용한계내로 유지되기 때문이다. 계사내 공기의 유해가스나 기타 유해성분 관리는 환기 목적중 한 부분(부수적으로 이루어지는)일 뿐이다.(중략)

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.396-398
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• 2010

밀폐된 공간으로 이루어진 작업장은 여러 가지 유해가스가 많이 발생된다. 이로 인해 환기가 불충분한 작업공간에서는 산소결핍 및 유해가스로 인한 건강장해와 인화성 물질에 의한 화재, 폭발 등의 위험이 존재한다. 따라서 유해가스 정보를 작업장 내의 센서를 통해서 실시간으로 모니터링하고, 위험으로부터 작업자의 안전을 보장할 수 있는 모니터링 시스템이 필요하다. 특히, 상황에 맞는 의사결정이 가능하도록 하기 위해 상황인식 시스템의 도입이 필요하다. 이 논문에서는 작업장의 유해가스 정보를 모니터링하기 위한 추론 규칙을 JESS를 기반으로 설계한다.

• Applied Chemistry for Engineering
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• v.25 no.2
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• pp.193-197
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• 2014

The electrode for gas sensor was prepared by using pitch-based activated carbon fibers and polyvinyl alcohol (PVA) to investigate the toxic gas sensing characteristics. The physicochemical properties of activated carbon fibers electrode for gas sensor were analyzed with SEM and BET. Toxic gases sensing property of the electrode was also identified by different toxic gases such as $NH_3$, NO and $CO_2$. The specific surface area of activated carbon fibers electrode for gas sensor was decreased by 33% owing to PVA used as a binder compared with the activated carbon fibers. However, its pore size distribution of the ACF electrode was not greatly influenced by PVA. The activated carbon fibers electrode for gas sensor responded to toxic gases by electron hopping unlike semiconductor based gas sensors. In this study, activated carbon fibers electrode was decreased to 7.5% in resistance for the NH3 gas of the 100 ppm concentration and its $NH_3$ gas sensing property was confirmed the most excellent compared with other toxic gases.

• Journal of the Korean Institute of Gas
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• v.17 no.4
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• pp.18-25
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• 2013

It may occur health hazards or death by suffocation or acute poisoning in case of oxygen deficiency in ambient or exposure to harmful gas. As a part of accident prevention, we studied the change of activity and lethal dose by changing the concentration of several hazardous gas with inhalation exposure chamber and laboratory animals. We investigated the lethality and motility change during either the 4 hrs whole body exposure to oxygen, nitrogen, toluene, $H_2S$, CO and 48 recovery. As results, it is estimated that 5% oxygen concentration as lethal concentration and 5.5% as $LC_{50}$ (rat, 4 hrs) with statistics for dose-response. The results of lethality in oxygen deficient condition (approximately 6%), the lethalities were 40%, 20% with 20 ppm $H_2S$, 600 ppm CO respectively, and was not increased the lethality with 8% CO. Thus, it was confirmed that the $H_2S$, CO had influence to lethal dose, while toluene had low fluence.

• Prospectives of Industrial Chemistry
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• v.23 no.3
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• pp.32-41
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• 2020

사람들은 대부분의 시간을 실내에서 보내고 있으며, 실내에 존재하는 유해가스는 미량의 농도에도 불구하고 심각한 질환을 일으킬 수 있다. 금속산화물 반도체 가스센서는 감도가 우수하고, 구조가 간단하며, 초소형화가 가능한 장점이 있어 고가의 대형 장비를 사용하지 않고 실내 유해가스를 측정하는 데 효과적으로 이용될 수 있다. 본 기고문에서는 금속산화물 반도체를 이용한 가스 센서의 검지 원리를 고찰하고, 나노 구조 조절, 마이크로 리액터 및 이중층 구조를 이용한 가스 개질 등 실내 유해가스 측정을 위한 다양한 센서 설계방법을 소개하고자 한다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.178-179
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• 2003

가스 상태의 반응 공정을 이용하는 반도체, 플라즈마, 연소 및 촉매를 이용한 유해가스처리와 대기환경 등에서는 반응을 주도하는 활성기(radical)의 역할 그리고 극미량(sub-ppm 수준)으로 존재하는 유해가스 성분등을 실시간으로 추적하는 것은 매우 중요하다. 현재 사용되고 있는 비 광학적 미량 가스 측정 장비들은 측정 대상 가스성분과 측정 장치의 프로브 사이의 물리적인 접촉이 요구되므로 감지시간이 늦고, 프로브 오염에 따른 hysteresis, 회복시간(recovery time)의 지연, 활성(부식성) 가스 샘플에 의한 감지기능 저하 등을 유발한다. (중략)

• Environmental engineer
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• s.121
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• pp.46-49
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• 1996

반건식 세정기는 기존습식처리 설비의 단점인 폐수 및 백연의 발생, 설비의 내구성 저하 등을 보완한 유해가스 처리설비로 탁월한 가스 및 중금속 제거효율, 백연 및 폐수의 발생이 전무하며, 반응생성물의 분리제거로 후단집진설비의 부하를 최대한 줄 일 수 있는 21세기 첨단 유해가스 제거기술의 결정체이다.

• Journal of the Korean Institute of Gas
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• v.17 no.2
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• pp.28-35
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• 2013

The number of large and complex buildings is growing and they are usually concentrated in metropolitan cities. There is a possibility in such buildings that a small accident can expand to a massive disaster since their scale and complexity. To deal with this issue, a research on gas sensors which can detect multiple gases and early-warning systems has been conducted. Proper criteria or standards are necessary for effective application and operation of such sensor-based disaster monitoring system. In this study, we have proposed the alarm criteria of concentration of hazardous gases for the detection and the alarm release. For each alarm level, systematic disaster response plans consist of responsive actions and information delivery have been prepared. These disaster monitoring criteria can help the detection of hazardous gas-related disaster in the early stage of accident and the provision of appropriate emergency responses.

• Journal of Korean Society of Environmental Engineers
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• v.38 no.5
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• pp.249-254
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• 2016

In this study, we investigated the main characteristics of off-gas generated from melting process and off-gas treatment system operation example to provide some primary data for commercial vitrification facility design. The purpose of vitrification facility operation is to treat hazardous materials in the radioactive wastes and harmful off-gas containing a variety of chemical species generated in the glass melting process. Constructing and operating vitrification facility essentially need to be licensed through safety analysis; it is very important to treat radionuclide and hazardous materials below the legal environment emissions regulation level. We must accurately understand the characteristics of off-gas and apply an appropriate off-gas treatment process accordingly. Thus, to design the appropriate off-gas treatment there must be a wide range of elements taken into account such as characteristics of waste and melter, regulation guidance of off-gas, characteristics of generated off-gas and off-gas treatment system performance assessment.

• KSBB Journal
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• v.19 no.3
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• pp.231-235
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• 2004

This paper was investigated to clarify the possibility of ammonia gas removal by essential oil. First of all, the chemical analysis was peformed to analyze the composition of an essential oil by GC-MS. The monoterpenes in an essential oil react with ammonia by neutralization and their reaction mechanism was elucidated. Based on their chemical neutralized reaction, the removal efficiencies of ammonia gas were studied to derive the optimal conditions in the scrubber tower such as optimal temperature and pH. The experimental result shows that the removal efficiency of ammonia gas was achieved over 98 % by the misty aerosol dispersion of scrubber tower.