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다양한 방법으로 제조된 CuO/CeO<sub>2</sub> 촉매에서의 벤젠의 연소반응
정원영,송영인,홍성수,Jung, Won Young,Song, Young In,Hong, Seong-Soo 한국청정기술학회 2013 청정기술 Vol.19 No.2
$CeO_2$에 담지된 구리산화물에서 벤젠의 촉매연소 반응에 대해 연구하였다. 담지된 구리산화물 촉매들은 볼밀법과 함침법으로 제조하였고, XRD, FT-IR, TEM 및 TPR에 의해 특성분석을 하였다. 볼밀법으로 제조된 CuO/$CeO_2$ 촉매는 높은 담지량에서도 잘 분산된 CuO를 얻었다. 볼밀법으로 제조된 CuO/$CeO_2$ 촉매는 함침법으로 제조된 촉매에 비해 높은 활성을 보여주었다. CuO의 담지량이 증가할수록 촉매 활성이 증가하였으며, 10 wt%로 담지된 촉매에서 가장 높은 활성을 나타내었다. 또한, 10 wt% CuO/$CeO_2$ 촉매에 소량의 $Fe_2O_3$와 CoO의 조촉매 첨가는 CuO의 분산도를 높여 반응활성을 증가시켰다. Catalytic combustion of benzene over $CeO_2$-supported copper oxides has been investigated. The supported copper oxides catalysts were prepared using ball mill method and characterized by XRD, FT-IR, TEM and TPR. In the CuO/$CeO_2$ catalysts prepared using ball mill method, highly dispersed copper oxide species were shown at high loading ratio. The CuO/$CeO_2$ prepared using ball mill method showed the higher activity than those prepared using impregnation method. The catalytic activity increased with an increase in the CuO loading ratio, 10 wt% loaded CuO/$CeO_2$ catalyst giving the highest activity. In addition, the promoting of 10 wt% loaded CuO/$CeO_2$ catalyst with $Fe_2O_3$ and CoO enhanced the dispersion of CuO and then increased the catalytic activity.
정원영,박종수,김판기,이정희,이용석,Chung, Won-Young,Park, Jong-Su,Kim, Pan-Ki,Lee, Jung-Hee,Lee, Yong-Surk 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.2B
현재 광대역통합망(BcN: Broadband convergence Network)에 대한 연구가 계속 진행 중에 있으며, 망의 규모가 커짐에 따라 가입자에 대한 서비스 품질(QoS: Quality of Service) 관리는 더욱 중요해 지고 있다. 3계층에서 QoS를 관리하는 것은 메모리의 크기나 소비전력의 비중이 크기 때문에 2계층에서의 Qos 관리가 필요하게 되었다. 또한 BcN에서는 여러 사용자가 제한된 서비스 자원을 공유하므로 최선(Best-Effort)의 서비스를 지향하는 방식으로 발전되어 왔다. 그러나 현재는 가입자들이 최선의 서비스 보다는 비싼 요금을 내더라도 차별화 된 서비스를 요구하고 있다. 따라서 가입자를 구별할 수 있는 멀티서비스 스위치에서 각 가입자는 과금에 따라 다른 대역폭을 할당 받게 된다. 기존의 대역제한기(Rate Limiter)는 포트별로 대역을 제한하기 때문에 가입자별로 공평한 대역을 보장하기 어렵다. 하지만 본 논문에서 제안한 대역제한기는 가입자별로 대역을 제한하므로 모든 가입자가 스위치의 구조와는 상관없이 공평한 대역을 제공받게 된다. 또한 가입자는 과금에 따라 가입자별로 다른 대역폭을 할당받으며, 학습된 가입자의 수에 따라 이더넷 스위치의 상향 링크 대역폭에 맞추어 학습된 가입자의 대역폭이 같은 비율로 조정된다. 그러므로 이더넷 스위치의 최대성능을 유지하며 QoS도 효율적으로 관리해 준다. Recently, a study of BcN(Broadband convergence Network) is progressing continuously, and it is important to improve the quality of the service according to subscribers because a scale of network is about to be larger. It is more important to manage QoS(Quality of Service) of all subscribers in layer 2 than layer 3 network since managing it in layer 3 network cost both additional processes and large hardware. Moreover, QoS based on Best-Effort service has been developed because tots of subscribers should use limited resource in BcN. However, they want to be supplied with different service even though they pay more charge. Therefore, it is essential to assign the different bandwidth to subscribers depending on their level of charge. The method of current Rate Limiter limits the bandwidth of each port that does not offer fair service to subscribers. The Rate Limiter proposed in this paper limits bandwidth according to each subscriber. Therefore, subscribers can get fair service regardless of switch structure. This new Rate Limiter controls the bandwidth of subscribers according to the information of learning subscriber and manages maximum performance of Ethernet switch and QoS.
정원영,안효진,도성준,임정남,임대영,최영옥,김기영,Jeong, Won Young,An, Hyo Jin,Doh, Song Jun,Im, Jung Nam,Lim, Dae Young,Choi, Yeong Og,Kim, Ki Young The Korean Fiber Society 2013 한국섬유공학회지 Vol.50 No.6
The purpose of this study is to develop a lightweight and environmentally friendly nonwoven fabric to substitute polyurethane (PU) foams in automotive interiors. Two types of hollow fibers-polyethylene terephthalate (PET) hollow fiber and polylactic acid (PLA) hollow fiber-and bicomponent binder fibers were used to manufacture the nonwoven fabrics for seat cushions by carding, needle punching, thermal bonding, and air through bonding processes. The ideal characteristics required for automotive seat cushions were evaluated, and the significant changes with the structural components were analyzed. The nonwoven fabrics showed better air permeability, compressional resilience, ball rebound resilience, and non-flammability in comparison with PU foams. The characteristics were affected by the manufacturing processes.
MoO3-SnO2-CeO2 촉매에 의한 대두유로부터 바이오디젤의 합성
정원영 ( Won Young Jung ),이만식 ( Man Sig Lee ),홍성수 ( Seong Soo Hong ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
The production of biodiesel by transesterification of soybean oil was performed on MoO3, SnO2 and CeO2 mixed oxides. The catalysts were characterized using XRD and NH3-TPD. MoO3 showed the highest activity among the three metal oxides. When 7 wt% of catalysts was introduced into the reactants, the highest activity was obtained and the water added to reactant decreased the catalytic activity. MoO3 and SnO2 mixed with 50:50 showed the highest activity and CeO2 added with 20% on the MoO3-SnO2 mixed oxide also showed the highest activity. The catalytic activity showed to have a good relationship with the amount of acid site of catalysts. When the waste soybean oil was used as a reactant, the conversion was decreased about 30%.
정원영(Won-young Jung),박은지(Eun-Ji Park),이주연(Joo-Youn Lee),김찬종(Chan-Jong Kim),박지은(Ji-Eun Park) 한국환경교육학회 2009 環境 敎育 Vol.22 No.2
We assumed that natural history museums have rooms for functioning as institutions for the environmental education, especially in aspects of multi-disciplinary, informal education. So we set goals of this research as finding 1) how much environmental education contents are reflected in exhibits of natural history museums, and 2) what those characteristics in aspects of dimension, range, and topic are. First, we developed a framework for analyzing of environmental education contents. Second, we applied the framework to seven major natural history museums. As the result, environmental education contents are reflected by 69.1 % totally. Especially, the 'knowledge' dimension covered mostly, and among them the range of 'elements of Ecosystem' occupied more than other ranges. With inferring our results, we suggested that characteristics of natural history museums in environmental education are followed; spatial-temporal expansion of bio-diversity concept, visualizing impacts of human activity against nature.
마이크로파 공정으로 제조된 LaMnO3 페롭스카이트형 촉매에서 벤젠의 연소반응
정원영 ( Won Young Jung ),홍성수 ( Seong Soo Hong ) 한국공업화학회 2013 공업화학 Vol.24 No.5
Perovskite-type oxides were successfully prepared using microwave-assisted process, and by XRD, XPS, BET, and H2-TPR. Their catalytic activities for the combustion of benzene were also examined. Most of catalysts studied showed the perovskite crystalline phase with the particle size of 21∼35 nm. The LaMnO3 catalyst showed the highest activity and the conversion reached almost 100% at 250 ℃. The catalysts prepared by microwave-assisted process showed higher activity compared to those prepared sol-gel method. In addition, the catalytic activity was increased with an increase of calcination temperature of LaMnO3-type catalyst. The TPR results on the measurement of redox property showed a good correlation with the order of catalytic activity on the benzene combustion reaction.
우레탄 아크릴 코팅 소재의 표면 색상 및 모폴로지가 긁힘 거동에 미치는 영향
정원영(Won Young Jung),원종일(Jong Il Weon) 한국고분자학회 2014 폴리머 Vol.38 No.1
표면 색상과 모폴로지가 우레탄-아크릴 코팅 소재 표면의 긁힘 거동에 미치는 영향을 조사하였다. 동일한 실험 조건에서, 흰색, 적색, 검정색 시험편의 순으로 긁힘 저항성이 우수함을 보였다. 이런 결과는 명암 대비효과를 가지고 설명될 수 있다. 즉 검정색 시험편의 경우, 긁힘이 생성된 손상 영역은 빛을 확산 반사하여 백화현상이 일어나고, 그 결과 주변 검정색과 대비되어 더욱 뚜렷이 구별된다. 반면, 흰색 시험편은 주변 흰색이 보호색 역할을 하여,긁힘 손상 부위를 인지하기 어렵게 된다. 광택도가 높은 시험편 표면일수록 에틸렌, 실리카 성분 및 카르보닐 그룹의 증가를 관찰할 수 있었다. 실리카 입자에 의한 표면 강성의 증가와 산화에 의한 카르보닐기 생성은 긁힘 저항성의 증가를 유도하고, 폴리에틸렌 왁스의 증가는 표면을 매끄럽게 하여 광택도의 향상에 기여한 것으로 보인다. 연구결과를 바탕으로 우레탄-아크릴 코팅 소재의 긁힘 저항성을 향상시킬 수 있는 기술적 접근 방법에 대해 토의하였다. The effects of surface color and morphology on the mar behaviors of urethane-acrylate coated surfaces wereexamined. The superiority of mar resistance was observed in the order of white, red and black-colored samples. This canbe explained by a contrast effect. In other words, in case of black colored sample, it takes place the defuse reflection ofthe incident light on the damaged region where mar damage exerts, leading to whitening phenomenon. Therefore, thedamaged region is easily recognized by contrasting the black background. On the other hand, it is difficult for the whitecoloredsample to perceive the mar-damaged area by the white background acting as protecting coloration. As the glossof urethane-acrylate coated surface increases, it is observed that there is an increase in the number of carbonyl (-C=O)function group, amount of ethylene and silica. The enhancements of surface rigidity by adding the silica particles and formationof carbonyl function groups by the surface oxidation lead to the increase in mar resistance, while the increase ofpolyethylene wax is responsible for the improved gloss and smooth-faced surface. Based on the above findings, technicalapproaches leading the improvement of mar resistance of the urethane-acrylate coated surface are discussed.