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Cha, Woojoon,Yun, Seong-Taek,Jurng, Jongsoo The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.33
<P>In this article, we describe the investigation and surface characterization of a chemical vapor condensation (CVC)-TiO<SUB>2</SUB> support material used in a V<SUB>2</SUB>O<SUB>5</SUB>/TiO<SUB>2</SUB> catalyst for enhanced selective catalytic reduction (SCR) activity and confirm the mechanism of surface reactions. On the basis of previous studies and comparison with a commercial TiO<SUB>2</SUB> catalyst, we examine four fundamental questions: first, the reason for increased surface V<SUP>4+</SUP> ion concentrations; second, the origin of the increase in surface acid sites; third, a basis for synergistic influences on improvements in SCR activity; and fourth, a reason for improved catalytic activity at low reaction temperatures. In this study, we have cited the result of SCR with NH<SUB>3</SUB> activity for removing NO<SUB><I>x</I></SUB> and analyzed data using the reported result and data from previous studies on V<SUB>2</SUB>O<SUB>5</SUB>/CVC-TiO<SUB>2</SUB> for the SCR catalyst. In order to determine the properties of suitable CVC-TiO<SUB>2</SUB> surfaces for efficient SCR catalysis at low temperatures, CVC-TiO<SUB>2</SUB> specimens were prepared and characterized using techniques such as XRD, BET, HR-TEM, XPS, FT-IR, NH<SUB>3</SUB>-TPD, photoluminescence (PL) spectroscopy, H<SUB>2</SUB>-TPR, and cyclic voltammetry. The results obtained for the CVC-TiO<SUB>2</SUB> materials were also compared with those of commercial TiO<SUB>2</SUB>.</P> <P>Graphic Abstract</P><P>In this article, we describe the investigation and surface characterization of a chemical vapor condensation (CVC)-TiO<SUB>2</SUB> support material used in a V<SUB>2</SUB>O<SUB>5</SUB>/TiO<SUB>2</SUB> catalyst for enhanced selective catalytic reduction (SCR) activity and confirm the mechanism of surface reactions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp02025a'> </P>
Cha, Woojoon,Ehrman, Sheryl H.,Jurng, Jongsoo Elsevier 2016 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.304 No.-
<P><B>Abstract</B></P> <P>In this study, our purpose was to investigate and research in depth the different physico-chemical properties and the surface phenomenon mechanism of the CeO<SUB>2</SUB>-added V<SUB>2</SUB>O<SUB>5</SUB>/TiO<SUB>2</SUB> catalyst prepared via the chemical vapor condensation (CVC) and impregnation method for enhanced NH<SUB>3</SUB>-selective catalytic reduction activity. In addition, we performed surface analyses of the materials using various techniques, such as X-ray photoelectron spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, and electron energy loss spectroscopy, and used some data from previous research. CeO<SUB>2</SUB> on the surface of V<SUB>2</SUB>O<SUB>5</SUB>-CeO<SUB>2</SUB>/CVC-TiO<SUB>2</SUB> contained a higher ratio of Ce<SUP>3+</SUP> ions. This was because many free carriers on the surface of the CVC-catalyst moved toward the surface of the loaded material that had higher binding energy (eV). Secondly, V<SUB>2</SUB>O<SUB>5</SUB>-CeO<SUB>2</SUB>/CVC-TiO<SUB>2</SUB> had very little amorphous-phase CeO<SUB>2</SUB> because of the inherent physical and structural properties. Finally, the CVC-catalyst showed higher reducibility and acidity when V<SUB>2</SUB>O<SUB>5</SUB> and CeO<SUB>2</SUB> were loaded onto CVC-TiO<SUB>2</SUB> because of a higher number of oxygen species and hydroxyls on the catalyst surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> V<SUB>2</SUB>O<SUB>5</SUB>-CeO<SUB>2</SUB>/CVC-TiO<SUB>2</SUB> contained a higher ratio of Ce<SUP>3+</SUP> ions. </LI> <LI> Many free carriers of the CVC-catalyst moved toward the higher binding energy (eV). </LI> <LI> V<SUB>2</SUB>O<SUB>5</SUB>-CeO<SUB>2</SUB>/CVC-TiO<SUB>2</SUB> had very little CeO<SUB>2</SUB> in the amorphous phase. </LI> <LI> Higher reducibility and acidity because of more oxygen species and hydroxyls. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
강우준(Woojoon Kang),추호성(Hosung Choo),김영기(Younggi KIim),강호원(Howon Kang) 大韓電子工學會 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.12
본 논문에서는 FM 라디오 송수신을 위한 항공기용 글래스 안테나를 제안하였다. 제안된 안테나는 광대역 주파수 특성을 얻기 위해 다중 루프 구조를 채택하였으며 탑승자의 시야확보를 극대화하기 위해 창틀 구조를 모사한 안테나 형상을 선택하였다. 세부적인 설계 변수는 Pareto 유전자 알고리즘을 이용하여 최적화하였으며 설계된 글래스 안테나를 실제 한국형 기동헬기조종석 측면 유리에 인쇄한 후 성능을 측정하였다. 측정결과 FM 주파수 대역에서 63.3%의 반전력 대역폭과, 전면방향(bore-sight direction)에서 평균 ?12.98 dBi의 수직편파 복사이득을 보였다. In this paper, we propose an aircraft on-glass antenna for FM radio reception. To obtain broad matching bandwidth, we employed a multiple loop as the basic antenna structure, and the shape of the loops mimics the frame of a window in order to ensure pilots’ field of view as large as possible. The detailed design parameters of the multi-loop structure were determined using a Pareto genetic algorithm with a full wave EM simulation tool. The optimized on-glass antenna was built and installed on a Korean utility helicopter (KUH). The measurement results showed a half power matching bandwidth of about 63.3 %, average vertical bore-sight gain of about -12.98 dBi in the FM band.
Design of vertical lines for vehicle rear window antennas
Kang, Woojoon,Choo, Hosung Wiley Subscription Services, Inc., A Wiley Company 2010 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.52 No.6
<P>In this article, we propose the design of a rear on-glass antenna for a commercial sedan. We focus on optimizing the vertical lines of the antenna and propose the optimum design parameters to maximize the matching bandwidth and improve the average vertical gain for the entire FM radio band. The detailed design parameters are determined using the Pareto genetic algorithm with an EM simulation tool. The optimized rear on-glass antenna was built and installed on a commercial sedan. The measurement results showed a matching bandwidth of about 15%, an average bore-sight gain of about −2.86 dBi in the entire FM band, and an average gain of about −14 dBi along the azimuth direction. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1445–1449, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25184</P>
기술신용평가기관(TCB)의 기술평가는 기업의 성장가능성을 예측할 수 있는가? : `양호 이상` 기업들 사례 중심으로
차우준 ( Woojoon Cha ) 한국경영공학회 2017 한국경영공학회지 Vol.22 No.1
In this study, the purpose was to confirm that TCB technology evaluation predicted the enterprise growth potential. First, the correlation between the technology grade and the financial performance after technology management is not close. However, in case of `T2` technology grade, the enterprises have the higher probability of the growth potential in nearby future. Second, the TCB technology grade is more affected from an enterprise infrastructure(called `the capability of technical commercialization`), such as the tangible and/or the intangible assets, the corporation history, the contracted buyers, and so on, because of the property of TCB technology evaluation model. Third, the capability of technical commercialization on TCB technology evaluation model has very close correlation with the credit grades of the evaluated enterprises. On the basis of the above mentioned conclusions, the current TCB technology evaluation model has some limitations to predict the enterprise growth potential in future, so the model needs some improvements.