• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.174-176
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• 2019

최근 미세먼지(PM10 또는 PM2.5)로 인한 인체 유해성 및 실제 피해사례가 인터넷, TV 매체 등에 의해 화두가 됨에 따라 각종 제조, 사업장 및 발전소에서는 미세먼지 배출기준을 충족하기 위한 고효율 집진 기술이 필요로 되고 있는 상황이다. 고압 코로나 방전에 의해 미세먼지를 포집하는 고전압 하전방식 집진장치의 경우 전류를 광범위로 조절 가능하며 역전리 방지에 탁월하여 고효율의 집진이 가능하다. 본 논문에서는 기존의 다전원(펄스전원, 기본전원)을 이용한 마이크로 펄스 하전방식이 아닌 공진형 컨버터와 고압 트랜스포머, 배전압 회로를 적용한 고전압 단전원 제어 하전방식 및 이를 이용한 고전압 전압원의 저속 스위칭 제어기법을 제안하고, 실제 측정을 통해 제안 방식의 실효성을 검증하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.426-428
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• 2021

반도체 디스플레이 기술과 정보통신 기술의 발전으로 디지털 사이니지는 기존의 단순 옥외 광고매체에서 탈피하여 이용자 맞춤 광고나 정보를 제공 및 스마트폰과 연동하여 콘텐츠 제공 가능한 시스템으로 발전하고 있다. 본 연구에서 디지털 사이니지의 작동오류의 위험성을 낮추며 비용절감을 할 수 있도록 제어 서버의 역할을 축소시키고 엣지 영역으로 서버의 역할을 최대한 분담하는 서버리스 기반 디지털 사이니지 시스템 구축 가능성에 대해 연구한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.683-686
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• 2008

최근 홈 네트워크라는 용어가 대중매체에 등장하고, 해외 선진국은 물론 세계 여러 나라들은 수년 동안 이러한 분야에 중점을 두고 연구 개발에 집중하고 있다. 현재 우리나라에서도 홈 네트워크에 관한 다양한 연구 개발이 이루어지고 있다. 특히 홈은 개인이 사용할 수 도 있지만, 다수의 가족이란 구성원이 존재하는 공간이다. 따라서 가정환경에 맞추어 능동적인 홈 네트워크 시스템이 작동하려면 다양한 상황과 각각의 상황에 맞는 서비스를 제공 받을 수 있어야 한다. 이를 위해 상황 인식 기반 홈 네트워크 개발 연구가 활발히 진행 중이다. 본 논문에서는 효율적인 홈 네트워크 구성을 위한 상황 인식과 컴퓨팅에 관해 고찰하고 이를 통해 보다 개선된 상황 인식 시스템을 설계한다.

• The Journal of the Korea Contents Association
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• v.10 no.3
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• pp.294-300
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• 2010

With the development of media technology, UCC actively working through the medium of the Net, the Internet space, which can influence politics instead of TV is drawing attention as the new leading media. As the one-sided media influence of TV is dwindling in the times of the Internet, the hegemony of the media is rapidly changing into UCC marked by two-way interaction. Especially, UCC has the characteristic that it has changed the people performing a role as the receptor of the media into the agent of enormous political influence as well as the freshness specific to its contents. This study was intended to investigate the types of diverse political influences of UCC in political practice as well as daily politics with a focus on the fact that it can newly project the world led by the media and their changes and exercise strong power in changing the society. Therefore, it attempted to investigate the political influence and ripple effect that UCC can exert by attempting to analyze what political influence UCC can exercise at diverse political situations including election. As a result, UCC led to four situations such as incentive-exploding type, issue-leading type, dispersion-switching type, direction-obeying type. This can be said to lead to the positive effect at the political field, such as implementing direct democracy through digital technology.

• Journal of Energy Engineering
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• v.11 no.3
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• pp.276-282
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• 2002

The process of energy separation in a low Pressure vortex tube with compressed air as a work-ing medium is studied in detail. Experimental data of the temperature of the cold and hot air leaving the vortex tube are presented. The variation of the maximum wall temperature along the inner surface of the vortex tube and the temperature distribution in a vortex tube provide useful information about the location of the stagnation point of the flow field at the axis of the vortex tube. Analysis of the results enabled to find the optimum length of the vortex tube, the optimum shape of the Throttle and the usefulness of the Sleeve. In this study Outer tube is used for the exhaust application. The hot gas flow is turned 180$^{\circ}$and passes the out-side of the vortex tube a second time heating it. From this geometric setup of a vortex tube He effects of energy separation and the prediction of the ignition of Diesel Soot is presented by experimental data.

• Journal of the Korean Institute of Gas
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• v.5 no.4 s.16
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• pp.33-39
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• 2001

This paper was studied on corrosion behavior of absorption refrigeration systems using $LiBr-H_2O$ working fluids. In the various concentration of lithium bromide solution, polarization test of SS 400, Cu(C1220T-OL) and Al-Ni bronze is carried out. And the corrosion behavior of materials forming absorption refrigeration systems is investigated. The main results are as following: 1) As concentration of lithium bromide solution increases, polarization resistance of materials of each kinds is low. And open circuit potential becomes less noble, the corrosion current density is high drained 2) Open circuit potential of SS 400 is less noble than that of Cu and Al-Ni bronze, corrosion current density of SS5 400 is high drained than that of Cu and Al-Ni bronze. 3) Anodic polarization of Cu and Al-Ni bronze in $62\%$ LiBr solution continues the active state. that of Cu and Al-Ni bronze in the natural sea water maintains the active state and the critical current for passivation appears.

• Solar Energy
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• v.18 no.3
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• pp.185-195
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• 1998

The high viscosity of a LiCl(lithium chloride) solution as an absorbent in a solar energy regenerator causes a channeling phenomenon on the solar powered absorber plate surface when the solution is trickling down for regenerating itself. As this channeling phenomenon affects badly the heat and mass transfer, it is pertinent that this phenomenon be studied. Since regenerating performance of the solar energy regenerator depends on how the solution uniformly flows on the plate surface, an experiment on the structure of the plate surface for a model regenerator was conducted. Various shapes and structures of the plat surface down which the LiCl solution trickled were tested, and it was found that a tiered surface showed the highest water evaporation rate leaving more potential energy concentrating LiCl on the plate. It was also observed that the water evaporation rate depended largely on the pitch and height of the disturbing rods. In addition, the wider the contact area is and the longer the solution's flow time, the better the solar energy regenerator's performance.

• Korean journal of communication and information
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• v.46
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• pp.420-448
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• 2009

This paper aims at advancing the understanding of human communication by reflecting the role of the consciousness of time in television communication. As the past, the present and the future are not independent realities, but co-exist in the human consciousness, the 'experience' and the 'expectation' are used as two essential conceptual tools which explain the mechanism of operation of the consciousness of time. The man anticipates the future based on the experience updated in the present, and chooses a present action and feels an emotion according to the expectation. The consciousness of time is extended to the symbolic instrument of time and the dominant vision of the world in the process of the socialization. The role of the consciousness of time in television communication is analyzed in both genres of information and fiction based on the media characteristics of television. The information and the fiction genres oppose to each other according to their relationships to the reality, but it turned out that their effects of communication such as enjoyment and novelty depends in common on the way of using the televiewer's consciousness of time.

• Journal of the Korean Institute of Gas
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• v.6 no.1 s.17
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• pp.92-97
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• 2002

This paper was studied on corrosion characteristics of gas absorption refrigeration & hot water system using $LiBr-H_2O$ working fluids. In the $62\%$ lithium bromide solution at $60^{\circ}C$, polarization test of Cu, $10\%$ cupronickel($90-10\%$ Cu-Ni) and $30\%$ cupronickel($70-30\%$ Cu-Ni) tube was carried out. And polarization behavior, polarization resistance characteristics, open circuit potential, anodic polarization of heat exchanger tube for gas absorption refrigeration & hot water system were considered. The main results are as following: 1) Polarization resistance of heat exchange tubes appears high in order of $30\%$ cupronickel tube > $10\%$ cupronickel tube > Cu tube. B) Open circuit potential of cupronickel tube is more noble than that of Cu tube, and corrosion current density of cupronickel is controlled than Cu tube. 3) Potential of passive region of $30\%$ cupronickel tube is more wide than that of $10\%$ cupronickel tube, and the passivation critical current of $30\%$ cupronickel tube is lower than that of $10\%$ cupronickel tube.

• Applied Chemistry for Engineering
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• v.30 no.1
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• pp.43-48
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• 2019

This study investigated the feasibility of $CaSnO_3$ particles as an oxygen carrier in chemical looping combustion (CLC). $CaSnO_3$ particles had a perovskite crystal structure and showed the structural stability after repeated reduction-oxidation reactions. The oxygen transfer capacity was 15.4 wt% almost the same as the calculated theoretical value from the crystal structure transformation during reduction. After $10^{th}$ cycles of reduction and oxidation, the oxygen transfer capacity and rate were still maintained constantly at an operating temperature. In conclusion, $CaSnO_3$ particles could be a good alternative material as an oxygen carrier in CLC.