• Fiber Technology and Industry
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• v.8 no.4 s.32
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• pp.365-377
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• 2004

• Proceedings of the Korean Fiber Society Conference
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• 2007.11a
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• pp.217-218
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• 2007

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.47 no.5
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• pp.33-42
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• 2010

In this study, we have proposed a simple cardiorespiratory monitoring method based on displacements of human body which occurs due to periodic heartbeat and breathing. The proposed system consists of an aircushion, pressure sensing hardware and heartbeat and respiration signals extraction algorithm. The aircushion was used for unconstrained measurement of the respiration and heartbeats without a sensor attached on the subject's skin surface. The displacements of subject sitting on the aircushion cause small pressure variations. These variations are amplified and filtered with the pressure sensing hardware. Finally, heart rate and respiration rate are extracted by signal processing algorithm based on frequency domain filter. To evaluate the performance, extracted respiration and heart rate from proposed system were compared with conventional methods. The average sensitivity of respiration and heart rate are 98.67% and 99.24%, respectively. These results show the proposed method has advantages of installing and processing simplicity so as to be used easily in unconstrained respiration and heart rate monitoring in daily life.

• Defense and Technology
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• no.3 s.145
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• pp.58-69
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• 1991

제2차 세계대전중 "폰 라빈스타인" 장군이 말한대로, 사막은 전술가에게는 천국이지만, 병참장교에게는 악몽과 같다는 명구가 사막전투의 어려움을 그대로 일러주고 있다. 사막은 높은 열과 습도로 인해 장병들의 작전효율을 크게 감소시키며, 특히 이번 걸프전의 경우 먼지와 모래바람은 첨단장비의 한계를 인식시켜주고 있다. AH-64 "아파치" 헬기는 매일 엔진을 세척하고 있으며, M1A1 "에이브람스" 전차는 가스터어빈 엔진의 에어필터를 이틀에 한번씩 교체하고 있다. 또한 무전기등이 고온에서의 장시간 사용으로 빈번하게 고장이 발생하며, 높은 온도는 "패트리어트" 제어장치의 공기정화장비에 과동력을 공급하여 오동작이 일어나기도 하였다

• Proceedings of the SAREK Conference
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• 2004.06a
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• pp.60-60
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• 2004

• Electrical & Electronic Materials
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• v.6 no.4
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• pp.302-310
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• 1993

일렉트렛트이란 자석과 대칭한 호칭으로 영구전기분극을 갖는 절연체를 말한다. 일랙트렛트는 1919년 강구에 의해 창제되었는데 이것은 왁스와 송지를 등량으로 혼합하여 만든것이었으나 최근에는 테프론이나 마이러, 폴리프로필렌등의 고분자 필름으로 만들게 되었다. 많은 고분자 재료는 절연성이 좋고 가공 성형도 용이하기 때문에 일랙트렛트로 하기에 편리하다. 그중에서도 합성고분자 필름에 의한 일랙트렛트는 마이크로폰이나 카트리지 등의 음향소자에 쓰이는 외에 정전모우터, 릴레이스위치, 에어필터나 의용재료에 널리 이용될 가능성이 나오고 있다.

• Proceedings of the SAREK Conference
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• 2005.06a
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• pp.22-22
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• 2005

• Proceedings of the Korean Nuclear Society Conference
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• 2002.10a
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• pp.347.2-347
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• 2002

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.18 no.4
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• pp.436-441
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• 2009

An air filter is a device to remove dust from the air supplied to the automotive engine. A requirement for the optimum air filter is to improve the capability to remove particles from the air it takes in, that is the efficiency and amount of dust collection. By removing dust from the air, the air filter prevents the engine cylinder from wear, reduces ventilation resistance, and thus improves engine output and guarantees intake performance. In order to guarantee such air filter performance, it is very important to properly seal the air filter. For passenger cars made in Korea, the air filters are fabricated with steel caps as their frames are large and their engine capacity is big. Recently however, European countries and Japan started using urethane for manufacturing the air filter, so that all foreign-made cars now have urethane filters. The urethanes used for air filters are applied in two ways: One is to use soft urethane for both top and bottom of the air filter and the other is to use soft urethane for the top and hard urethane for the bottom. Each of these method has unique problems. In this study, hard urethane is used for both top and bottom of the filter in order to improve those problems and increase the sealing efficiency. Especially for the top, NBR (rubber mold) is pre-settled in tough urethane and then the urethane is solidified through foaming, which makes it possible to develop a solid and double-sealed filter.

• Transactions of the Korean Society of Automotive Engineers
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• v.13 no.2
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• pp.114-117
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• 2005

Air cleaners in all of the automotive engines have been used for decades. In the early 1920's the oil bath type was the popular shape of air cleaners. The air cleaners of the oil wetted bath type were introduced in 1940's. The shape of the dry pleated paper type media was introduced in the 1950's. This trend still continues with new and innovative media being introduced. Engine air cleaners should have effectively removed and reduced harmful contaminants being ingested into engines. This studies show that both, the ingested contaminant size and concentration need to be controlled. This paper com pare and analyze the characteristics over the economics, engine performances and reduction of noises of power-plus air filters with wet paper which were sticked to heavy duty diesel engine.