• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1996.04a
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• pp.44-48
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• 1996

본 연구는 석탄가스화복합발전(IGCC) 시스템중 핵심 단위 장치중의 하나인 가스화기 내부에서 일어나는 석탄의 가스화 반응 연구를 PCGC-2 프로그램을 통해 수행하였으며 일차적인 목표로 반응장에서의 선회 강도에 따른 가스화기내 유동 및 반응 특성을 파악하고자 하였다.

• Clean Technology
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• v.15 no.2
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• pp.130-136
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• 2009

Commercial catalyst (Cu-Zn/$Al_2O_3$, Johnson Matthey Co., 83-3 Catalyst) was applied to the hydrogen production by steam reforming of methanol in the micro-channel reactor (MCR). The steam reforming of methanol was tested over Cu-Zn catalyst at temperatures in the range of 200 and 300$^{\circ}C$, the catalyst size of 0.05${\sim}$2.2 mm, the space velocity of 3,000${\sim}$10,000 $hr^{-1}$ in a fixed bed continuous flow reactor. The conversion of methanol and the yield $H_2$ preferred high temperatures and low space velocities, and had optimal results with the particle size of 0.35 mm. Based on the results from experiments with fixed bed reactor, two types of MCR, boat bed and stacked bed MCRs, were studied. The stacked bed type MCR showed better methanol conversion compared with the boat type one.

• Korean Chemical Engineering Research
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• v.60 no.1
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• pp.116-124
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• 2022

In this study, waste air containing ethanol and hydrogen sulfide, was treated by an integrated hybrid system composed of two alternatively-operating UV/photocatalytic reactor-process and biofilter processes of a biofilter system having two units with an improved design (R reactor) and a conventional biofilter (L reactor). Both a pressure drop (△p) per unit process of the integrated hybrid system and a microbe-population-distribution of each biofilter process were observed. The △p of the UV/photocatalytic reactor process turned out very negligible. The △p of the L reactor was observed to increase continuously to 4.0~5.0 mmH₂O (i.e., 5.0~6.25 mmH₂O/m). In case of R reactor, its △p showed the one below ca. 16~20% of the △p of the L reactor. Adopting such microbes-carrying biofilter media with high porosity as waste-tire crumb media, and the improved biofilter design, contributed to △p of this study, reduced by ca. 37~50% and 40~53%, respectively, from the reported △p of conventional biofilter packed with biofilter media of the mixture (50:50) of wood chip and wood bark. In addition, the △p of R reactor in this study, reduced by ca. 80% from the reported △p of conventional biofilter packed with biofilter media of the mixture (75:25) of scoria with high porosity and compost, was mainly attributed to adopting the improved biofilter design. On the other hand, in case of L reactor, the CFU counts in its lowest column was analyzed double as much as those in any other columns. However, in case of R reactor, its CFU counts were bigger by 50% than the one of L reactor and its microbes were evenly distributed at its higher and lower columns of R_dn reactor and R_up reactor. This phenomena was attributed to an even moisture distribution of 50~55% of R reactor at its higher and lower columns. Therefore, R reactor showed superb characteristics in terms of both △p and microbe-population-distribution, compared to L reactor.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.66-68
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• 1999

본 논문에서는 정보여과 시스템에서 웹 페이지를 수집하고 여과하는 과정과 사용자 프로파일을 학습하는 과정에 하이퍼링크 정보를 이용하는 방법을 제안한다. 사용자가 원하는 웹 페이지를 추천하기 위해 사용자 프로파일을 하이퍼링크 정보를 이용해 만들고 사용자의 반응(feedback)에 따라 사용자 프로파일을 조정한다. 가중치 조정에 있어서 학습 효과를 높이기 위해 사용자가 반응을 보인 웹 페이지에서 출발해 링크로 연결된 모든 페이지에 대해 깊이에 따라 가중치를 조정하는 가중치 전파 알고리즘(Weight Propagation Algorithm)을 제안한다. 적은 사용자의 반응으로도 프로파일 내의 많은 페이지에 영향을 줄 수 있어 높은 학습 효과를 기대할 수 있다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2001.11a
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• pp.48-49
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• 2001

광촉매 분해반응시 광원으로서 기존의 UV램프의 사용에서 벗어나 인공적인 에너지가 필요없는 태양광을 VOCs 광분해에 solar simulator에서 타당성을 검토하고 태양광에 직접 적용하여 확인하였다. $TiO_2$-UVA 시스템에서 보다 $TiO_2$-태양광을 적용한 실험에서 분해반응속도의 증가를 보였다. 결과적으로 VOCs처리에 있어서 태양광의 적용이 가능하며 최대 4.514${\times}$$10^{-5}$ Einstein $min^{-1}$의 photon flow를 필요로 하는 광촉매분해반응에서 $TiO_2$ UVA시스템보다 태양광을 이용한 적용이 더 효과적인 것으로 사료된다.

• Journal of Internet Computing and Services
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• v.17 no.2
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• pp.59-65
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• 2016

The result of analyzing the cognitive reaction due to the color environment has been applied to various filed especially in medical field. Moreover, the study about the identification of patient's condition and examination the brain activity by collecting the bio-signal based on the color environment is being actively conducted. Even though, there were a variety of experiments by convention the color environment using a light or LED color, it still has a problem that affects the psychological information. Therefore, our proposed system using a HMD (Head Mounting display) to provide a completed color environment condition. This system uses the BMS(Biomedical System) to collect the biometric information which responds to the specific color condition and the human body response information can be measured by the development the Memory and Attention test on Mobile phone. The collection of Biometric information includes electro cardiogram(ECG), respiration, oxygen saturation (Sp02), Bio-impedance, blood pressure will store in the database. In addition, we can verify the result of the human body reaction in the color environment by Memory and Attention application. By utilizing the reaction of the human body information that is collected thought the proposed system, we can analyze the correlation between the physiological information and the color environment. And we also expect that this system can apply to the medical diagnosis and treatment. For future work, we will expand the system for prediction and treatment of Alzheimer disease by analyzing the visualization data through the proposed system. We will also do evaluation on the effectiveness of the system for using in the rehabilitation program.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.659-661
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• 1998

다목적위성 관제 시스템의 한 부분만 위성운용 서브시스템의 실시간 처리 성능을 분석하기 위한 알고리즘과 이를 구현한 프로그램이 개발되었다. 이 프로그램은 위성운용 서브시스템에서 발생되는 event들과 이에 대한 response들의 속성에 관한 파라미터 값이 입력되었을 때, 각 event의 반응 시간과 스케줄 가능성을 계산하고 스케줄된 event들을 시각화한다. 실험 결과, event의 blocking delay, 주기 및 첫 action의 우선 순위가 해당 event 또는 다른 event의 반응 시간에 많은 영향을 준다는 것이 밝혀졌다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.05a
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• pp.147-147
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• 2012

스퍼터링을 이용한 증착 시스템은 인가된 전력의 대부분이 타겟의 가열에 사용되어 에너지 효율이 낮다는 단점이 있고, 저항 가열을 이용한 증발 증착 시스템은 대전류를 필요로 하고 증발 물질이 보트 물질과 반응하지 말아야 한다는 제약이 있고 질화물을 형성하는 반응성 프로세스에서 증발량을 일정하게 조절하기 어렵다. 두 가지 공정의 장점을 살린 스퍼터-승화 시스템을 고안하고 이를 위한 수치 해석을 CFD-ACE+를 이용하여 실시하였다.

• Korean Chemical Engineering Research
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• v.51 no.4
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• pp.455-459
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• 2013

The fuel processor for the portable fuel cell includes multi-step processes consisting of hydrogen generator, heat generator and several CO clean-up stages. One of requirements of the fuel processor for portable fuel cell system is a rapid start-up time. Especially, the warm-up time for WGS reactor is crucial factors for total start-up time. In this paper, active heating protocol, which is the heating protocol of WGS reactor supplied by the oxidation of CO rich reformate in the initial stage, is used for a rapid start-up. The air stream fed to the inlet of WGS reactor rapidly oxidize the CO rich reformate in the WGS reactor. Therefore, CO concentration in reformate quickly stabilized at the desired concentration without CO surges.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.587_588
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• 2009

본 논문에서 전력 시스템 운영자의 trigger poin와 수요 반응 프로그램 참여자의 가격 탄력성에 따라 수요 반응 이후의 전기 가격을 예측하여 경제성 수요 반응 프로그램에 어떤 영향을 끼치는 지 살펴보고 운영자가 수요 반응 프로그램 반응 정보를 쉽게 파악할 수 있게 PR을 제안한다.