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Jun Ho Cheon,Jaeheung Lim,Sung Min Seo,Jun-Myung Woo,Seok Hyang Kim,Yongjoo Kwon,Jung Woo Ko,Tae June Kang,Yong Hyup Kim,Young June Park IEEE 2010 IEEE transactions on electron devices Vol.57 No.10
<P>A carbon nanotube network device having concentric-shaped electrodes (source and drain) is analyzed to examine the 'self-gating' effect of various pH buffer solutions on its electrical properties. Using the 2-D homogeneous percolation theory, current-voltage characteristics of the devices are described as the classical MOSFET formula, in which the device is modeled as the p-type transistor with positive threshold voltage and the gate is tied with the drain (at positive bias) or source (at negative bias). To determine the apparent threshold voltage change due to the corresponding pH value, the ∂V<SUB>D</SUB>/∂I<SUB>D</SUB> (V<SUB>D</SUB>:drain voltage; I<SUB>D</SUB>:drain current) curve is extracted from the measured current-voltage characteristics to find V<SUB>D</SUB>_SAT(= -V<SUB>TH</SUB>, V<SUB>QS</SUB> = 0). A threshold voltage shift according to the pH value is observed without an external gate electrode, showing the possibility of relaxing the requirement of the external gate electrode. By grafting protonation/deprotonation which occurs in the carboxylated single-walled carbon nanotubes, the decaying current as pH increases is explained. Better sensitivity according to the operation regime is examined by the device modeling.</P>
Towards high-performance DPP-based sensitizers for DSC applications
Yum, Jun-Ho,Holcombe, Thomas W.,Kim, Yongjoo,Yoon, Junghyun,Rakstys, Kasparas,Nazeeruddin, Mohammad K.,Grä,tzel, Michael The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.87
<P>A novel, asymmetric DPP bridge/core was synthesized and tested in DSC devices. By desymmetrising the DPP core/bridge, a remarkable IPCE of >80% and a maximum power conversion efficiency of 7.7% were achieved. With the use of a wide-bandgap co-sensitizer, 8.6% PCE was realized under standard AM1.5G sunlight.</P> <P>Graphic Abstract</P><P>An asymmetric diketopyrrolopyrrole core and bridge for use in dye-sensitized solar cells achieves enhanced photon-to-electron conversion efficiency. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc35597c'> </P>
지역사회 중독관리서비스 현황 : 중독관리통합지원센터를 중심으로
전교연(KyoYeon Jun),이루리(Luri Lee),박우리(Woori Park),황우석(Wooseok Hwang),이용주(YongJoo Rhee),오홍석(Hong Seok Oh),김용진(Yong Jin Kim),이해국(Hae Kook Lee),노성원(Sungwon Roh) 한국중독정신의학회 2017 중독정신의학 Vol.21 No.2
Objectives : The number of patients withsubstanceuse disorders, gambling disorder, and Internet gaming disorder is estimated atabout 5 million. However, only 1-8 percent of them receive treatment. This study identified the current situation of the Community Addiction Management Centers (CAMC) in Korea, and suggested a way to improve addiction management. Methods : The research investigated the current status of CAMC and individual tasks. It reviewed the addiction management system of the Substance Abuse and Mental Health Administration (SAMHSA) in the United States. Results : The subjects consisted of 255 employees. In most centers, more than 95 % of registered subjects were patients with alcohol use disorder, whereas patients with drug use disorders were 16.9% in Gwangju/Jeonnam. Patientswith gambling disorder were 10.9% in Jeonbuk, and 12.7% in Jeju. Large-scale centers with 8 or higher full time equivalent deal with addictions other than alcohol and have higher work efficiency. Conclusion : In order to improve the standard of addictionmanagement, a large-scale center is advantageous, and each center should set its task goal considering the size and regional characteristics of the center. It is necessary to establish a systematic liaison with local agencies and secure funds for preventing the breakaway of experienced workforce.
802.11 Wireless LAN 환경에 적합한 프로세서 구조
전성재(Sungjae Jun),홍인표(Inpyo Hong),이용주(Yongjoo Lee),이용석(Yongsurk Lee),정진우(Jinoo Joung) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅰ
최근 휴대폰 , PDA. 노트북 등의 모바일 제품의 인기에 따라 모바일에 대한 소비자의 관심이 증대되고 있으며, 대형 네트워크 장비보다 소형의 개인 휴대용의 모바일 제품의 성장세가 두드러지고 있다. 이러한 추세에 따라 무선랜에 대한 관심도 증대되고 있다. 본 논문에서는 기존의 ARM 프로세서를 기반으로 802..11 무선랜 환경에 맞는 네트워크 프로세서 구조에 대한 연구를 수행하였다. 그 결과 전송과 수신이 빈번하게 동시에 밀어나는 무선랜 환경에서는 multi-threading을 처리할 수 있는 프로세서가 구조(SMT)가 superscalar 구조에 비해 높은 성능 향상폭을 보여주었다.
Kim, Hyeong Jun,Kim, Jin-Seong,Kim, Youngkwon,Jung, Yeon Sik,Kim, Bumjoon J.,Kim, YongJoo Elsevier 2019 Polymer Vol.178 No.-
<P><B>Abstract</B></P> <P>In this study, we developed a simple coarse-grained simulation model framework to investigate the effect of regioregularity (RR) on the crystallization behavior of poly(3-hexylthiophene) (P3HT). To describe the regio-chemistry of P3HT, two different coarse-grained beads were designed to contain either regio-regularly substituted head-to-tail (HT) orientations or regio-irregularly substituted non-HT orientations, and two beads were randomly incorporated in a single polymer where the total RR was tuned from regio-random (RR = 50%) to regio-regular (RR = 100%). Based on our modeling, the crystallization behaviors in both bulk and solution states were investigated. As the number of irregularly substituted non-HT orientations increased, crystallization temperature in the bulk shifted to a lower temperature. When the RR of P3HT was lower than a critical RR value, which was 72.2% in our study, the crystallization of the P3HT chains was eventually suppressed. In the solution state, most of high RR P3HT chains stacked in parallel to produce nanowire (NW) structure to maximize the number of π-stackings in the system, whereas the P3HTs formed a globule structure when the RR value decreased below critical RR. To experimentally validate our simulation results, we synthesized a series of P3HTs having precisely controlled RRs from 66% to 95% with comparable molecular weights to the simulation. Well-matched experimental results suggested that our simplified model provides efficient computational guidance to describe the RR effect on crystalline feature of P3HTs for the various possible applications in organic optoelectronics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple coarse-grained model is developed to describe the effect of regioregularity (RR) on crystallization of P3HT. </LI> <LI> Experimental validation with a series of P3HTs having a wide range of RR from 66% to 95% is followed. </LI> <LI> Our model predicts critical RR value for crystallization of P3HT in bulk and solution. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>