• 한국방재학회:학술대회논문집
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• 2007.02a
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• pp.565-570
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• 2007

The explosionproof apparatus is a devices that is enclosed in a case capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby This kind of exeplosionfproof devices should be installed suitable for the characteristics of the space or process condition that should be protected to prevent explosion or fire. But, due to the lack of information and techniques on the explosionproof technology, some dangerous area is not properly protected from an explosion or it cost too much to implement the explosionproof devices. In this report, the basic guidelines and several case studies of explosionproof devices installation will be introduced to be of help to field safety engineer.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.303-306
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• 1999

For the purpose of Military means, explosion proof concrete, which protect the structures from the damage due to the explosion of bomb and maintain its shape, is required to develop. Therefore, in this paper, mechanical and explosionproof properties of concrete are tested under various steel fiber contents and member size. According to the experimental results, compressive, tensile and flexural strength go up with the increase of fiber contents. Energy bearing capacities is higher with the increase of fiber contents. Especially, it is confirmed that slurry infiltrated fiber concrete (SIFCON) gains in high strength and has high energy bearing capacities. SIFCON is expected to apply in the construction of explosion proof structures.

• 전기의세계
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• v.17 no.2
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• pp.27-31
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• 1968

최근 각종 회전전기의 설계제작에 있어서 그경제성과 신뢰성을 높이고저 가능한 한고속화 내지는 단일화 경향에 있다. 예로써 1,500MV급 주발전기라면 8MW라는 려자전력이 필요하므로 이를 종래의 직결직류려자기방식으로서는 정류조건에서 제한을 받게된다. 고로이러한 난문제의 해결책으로서 직류여자기의 감속, 별치의 M-G Set, 또는 이중전기자법등이 고찰되고 있으나 역시 과담한 경제문제를 수반하게 된다. 또한 각종산업의 발달에 따라 요구되는 부하특성과 가혹한 환경조건에서 운전되어야할 경우가 증가되고 있다. 즉 염소Gas, 아유산 Gas, 인화유기 또는 공해상등을 막론한 주위조건에서 방식방폭의 안정성과 소형경량화의 경제성등을 설계의 주요목적으로 본다. 이것은 회전전기의 고정자와 회전자간에 전달되는 전기적 Energy가 회전기계의 가장 약점인 탁동부분을 통과하기 때문이다. 여기에서 탁동부를 제거할 수단으로 Brushless 려자방식이 고안되었으며 오래전부터 그 Idea가 창안되어 있었으나 최근 갑자기 극소용량급에서 초대용량급에 이르기까지 Brushless화 되었음은 재료과학에서 본 자기증중기 또는 반도체공학의 발달이 크게 영향하였다. 필자는 여기에 발전기를 중심으로 Brushless 려자방식의 종류와 문제점을 검토하여 금후 발전될 전망에 대하여 간단히 논한다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1997.11a
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• pp.135-142
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• 1997

For lighting of dark and hazardous workplaces such as compartments of ships under construction, workers should use hand lamps of explosion-proof type. However, the heavy weight of such lamps has prevented most impatient workers from using such types of lamps extensively. In this paper, ire developed a light weight hand lamp of intrinsic safety type which reduced the weight a lot while maintaining or improving the lighting and explosion-proof function. We made a Prototype which consisted of lamp fixture and low/high frequency power supply. Testing results show that the hand lamp meets well all the explosion-proof testing requirements of the Korea Industrial Safety Corporation.

• Journal of the Korean Society of Safety
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• v.29 no.6
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• pp.49-54
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• 2014

Electrostatic eliminators are essential in various areas of manufacturing industries to protect electrostatic hazards and to reduce inferior products. For ion sources used in the charge neutralizers, there are corona discharge, soft X-ray, and ultraviolet and glow discharge. Among them, corona discharge is generally used, because the corona discharge can easily and economically produce positive and negative ions including electrons in air at atmospheric pressure. But it is necessary to equip explosion-protection electrostatic eliminators wherever hazardous atmosphere. The electrostatic eliminators and their testing method of explosion-protection type have been developed in this research. The contents and scope of the research as follows; developing the type 'Ex s IIB T4' electrostatic eliminator of explosion-protection; developing the type 'Ex s d IIB T4' electrostatic eliminator of explosion-protection; developing the explosion-protection performance testing method of electrostatic eliminator for using AC power source.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.583-587
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• 1998

본 논문에서는 대형 탱커선의 의무 장비인 유배출 감시 장비 (Oil Discharge Monitoring Equipment)를 위한 유분 농도계의 설계에 대하여 연구하였다. ODME는 국제해사기구 (IMO)에서 일정 ton 이상의 대형 선박에 의무적으로 설치하도록 규정하고 있으며 이는 날로 심각해지는 해양 오염을 방지하는데 목적이 있다. ODME의 구성 요소는 중앙 제어 장치, 유분 농도계, 유량계, 선속계, Sampling System, 배출 제어 장치로 이루어져 있으며 이중 가장 중요한 것은 유분 농도계이다. 이는 선박에서 배출되는 물에 포함된 유 성분을 ppm 단위로 계측하는 것이다. 이를 위한 탁도 측정 방법에는 여러 가지가 있지만, 본 연구에서는 선박에서 사용이 용이한 광산란 방식과 방폭성을 가지는 광섬유를 이용하여 탁도를 측정하는 유분 농도계를 설계하였으며 아울러 이에 대한 탁도 계산 알고리즘에 대하여 고찰하였다. 측정의 정밀도는 0-999ppm 범위에서 $\pm$5%의 오차 이내로 측정이 가능함을 보였다. 이는 IMO의 규격 ($\pm$10%의 오차)에 만족하는 수치이다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1063-1066
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• 2003

A flow-meter and its measurement controller was developed for a hydraulic system. This study, for development of positive displacement flow-meter, consist of PIC(Peripheral Interface Controller) controller with MR(Magneto-resistive) sensors. This flow-meter is used valve position indicator for valve control system by hydraulic. The MR sensors are used for the rotation of OVAL gear that detecting device. In the ship environments, consideration that necessary explosive proof. Thus electro device or electro flow-meter needs explosion design for electric circuit. We designed noncontact type flow-meter and evaluated the safety and measuring abilities.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1513-1514
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• 2015

전력설비가 열화, 서지에 의해 절연이 파괴되었을 경우 밀폐기기 경우 폭발, 화재를 일으킴으로써 일반인에게 피해를 입히거나 인근 설비로 파급이 확대될 가능성이 있다. 최근 전력설비는 대용량화 추세인 반면 콤팩트 사이즈를 요구하고 있어 절연문제로 인한 폭발 가능성은 더욱 커지고 있다. 이러한 전력설비의 폭발을 방지하고 피해확대를 줄이기 위해 방압변, 순간압력상승 방지장치 등이 설치되고 있으나, 예방에는 한계가 있다. 이에 최근, 국외를 중심으로 전력기기 특히, 지상설치기기의 안전성 확보를 위해 고속투입 접지스위치(Arc Eliminator)를 개발하여 설치 의무화를 고려하고 있다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.88-89
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• 2017

Due to the increase in the usage of explosive materials and terrorism, the interest towards the superior explosion protective HPFRCC has risen. In existing research, the optimum ratio for solving the problematic problems such as the optimum fiber incorporation rate and the self-shrinkage crack of HPFRCC had been derived. However, there had been few or even no research upon how effective HPFRCC would perform protective explosion-proof in actual explosion. Therefore, this research compared the explosion-proof performance of HPFRCC according to fiber commination and mixing ratio. As a result, the combination of steel fiber and organic fiber showed excellent flow and strength, and it also improved the explosion resistance.

• Journal of the Korea institute for structural maintenance and inspection
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• v.4 no.3
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• pp.129-136
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• 2000

In the side of military purpose, the explosion proof concrete, which contributes to protect the military facilities from damages due to the explosion of bomb and to maintain their shapes, is required to develop, Therefore. in this paper, mechanical and explosion-proof properties of concrete are tested under various steel fiber contents and member size. According to the experimental results, compressive, tensile and flexural strength gain higher levels with an increase in fiber contents. It shows that energy bearing capacities are higher with an increase in fiber contents. Especially. it is confirmed that slurry infiltrated fiber concrete(SIFCON) gains high strength and has high energy bearing capacities. SIFCON is expected to be applied in the construction of explosion proof structures.