http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Lee, Kyu Cheol,Song, Seyeong,Lee, Junghoon,Kim, Dong Suk,Kim, Jin Young,Yang, Changduk WILEY‐VCH Verlag 2015 ChemPhysChem Vol.16 No.6
<P>To be meaningful to guide the rational design of novel high-performance conjugated semiconductors, we prepared three benzo[1,2-b:4,5-b]dithiophene (BDT)-based polymers by systematically moving the branching point of the alkyl chain. The effect of side-chain engineering was thoroughly investigated by a range of techniques. We demonstrate that a subtle change in the branching position in the BDT core can have a critical impact on polymer packing and preferential backbone orientation in thin films; copolymers made from BDT and thieno[3,4-c]pyrrole-4,6-dione units (TPD) adopt more of a face-on orientation as the branching point is shifted closer to the backbone, which can be correlated with a dramatic difference in solar-cells performance. The high short-circuit current density (11.6 mAcm(-2)) for the copolymer with one carbon atom between the alkoxylated oxygen atom and the branching point results from its predominantly face-on orientation and smoother surface in thin films, which results in power conversion efficiencies as high as 4.56%.</P>
호스트 기반 분산형 이동성 관리 기술에서 안전하고 효과적인 바인딩 업데이트
이세영(Seyeong Lee),최형기(Hyoung-Kee Choi),김이진(EJin Kim) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.2
모바일 트래픽이 급격히 증가함에 따라 모바일 기기가 끊김 없이 통신하기 위한 이동성 관리 기술로써 DMM(Distributed Mobility Management)이 제안되었다. DMM은 코어 네트워크에서 엣지 네트워크로 이동성 관리를 분산하여 낮은 지연으로 안정적인 바인딩 업데이트를 가능하게 한다. 그러나 DMM 시스템에는 여전히 네트워크상의 지연 문제와 세션에 대한 보안상의 문제가 존재한다. 본 논문에서는 기존 DMM 시스템에 존재하는 문제점을 지적하고, 이를 해결하기 위해 MN (Mobile Node)이 직접 인증에 참여하여 올바른 상호 인증이 이루어지는 새로운 프로토콜을 제안한다. 또한, 성능 분석을 통해 보안상의 향상뿐만 아니라 성능상의 향상이 존재함을 확인하였다. As mobile traffic increases rapidly, DMM (Distributed Mobility Management) has been proposed as a mobility management technology for seamless communication of mobile devices as mobile traffic increases rapidly. the DMM distributes mobility management from the core network to the edge network, enabling stable binding updates with low latency. However, the DMM still have network delay and security problems for sessions. In this paper, we point out the problems existing in the DMM and propose a new protocol in which the MN (Mobile Node) directly participates in authentication and mutual authentication is correctly performed to solve this problem. We demonstrate not only security improvements but also performance improvements with performance analysis
자히드,Seyeong Lee,Nasir Arsalani,Kurt E. Geckeler,홍석원,윤명한 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.2
In this study, commercially available cellulose membranes were hybridized with conjugated polymer via vapor-phase polymerization using pyrrole and iron chloride as a monomer and oxidant, respectively. The iron (III) chloride layer dip-coated on the hydrophilic cellulose surface oxidized the vaporized pyrrole monomer leading to the polypyrrole–cellulose hybrid membrane. The conductivity of hybrid membrane was optimized by varying the oxidant concentration and the monomer vapor exposure time. The various surface characterizations of polypyrrole–cellulose hybrid membrane show that the conductive polypyrrole layer was uniformly deposited onto the surface of cellulose fibrous networks unlike the polypyrrole–nylon hybrid membrane prepared in the similar way. The polypyrrole-incorporated cellulose networks exhibits steeper electrical conductance increase over the vertical pressure than its nylon counterpart. Our result suggests that the polypyrrole–cellulose hybrid membrane can be applicable for a disposable high-load pressure sensor.
Song, Seyeong,Lee, Kang Taek,Koh, Chang Woo,Shin, Hyebeom,Gao, Mei,Woo, Han Young,Vak, Doojin,Kim, Jin Young The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.11
<P>Hot solution deposition has emerged as a promising strategy to achieve high performance polymer solar cells and many state-of-the-art devices have been recently fabricated by this approach in research laboratories. Currently, a major challenge in the photovoltaics community is translating such methodologies into industrially relevant processes so that progress can be made beyond the research community. In this work, hot deposition is developed <I>via</I> a slot die coating process, using a thermally robust and thickness tolerant photovoltaic polymer and a 3D printer-based slot die coater. This method uses not only hot substrates but also hot solutions. We find that controlling solution and substrate temperatures is critical to achieve optimum morphology and high device performance. Analysis of nano-morphology and molecular packing shows a clear influence of both solution and substrate temperatures. At optimal temperature conditions (80 °C head−80 °C substrate), slot die coated devices with an inverted configuration exhibited up to a 7.61% power conversion efficiency without using additives or other processing treatments, which are detrimental to stability and processing efficiency. The optimum temperature combination was readily scaled up using roll-to-roll processing equipment without further optimization, yielding flexible polymer solar cells with a 7.06% power conversion efficiency, demonstrating the potential of the hot slot die coating method from an industrial perspective.</P>
Song, Seyeong,Heo, Jungwoo,Lee, Tae Kyung,Park, Soojin,Walker, Bright,Kwak, Sang Kyu,Kim, Jin Young American Chemical Society 2017 The Journal of Physical Chemistry Part C Vol.121 No.33
<P>The application of localized surface plasmon resonance (LSPR) phenomena is an effective strategy to enhance the performance of polymer solar cells (PSCs) because of their ability to efficiently scatter light and dramatically increase light absorption in the active layer of PSCs. Unlike previous reports investigating LSPR materials in PSCs, we have approached the LSPR phenomenon from a physical perspective by examining the influence of the surrounding environment on LSPR properties. Uniformly ordered two-dimensional 10 nm Ag quantum dot arrays (2D Ag QAs) were prepared and utilized in PSCs. The 2D Ag QAs were incorporated into electron transport layers with different refractive indices, which showed a significant bathochromic shift as the refractive index increased and excellent agreement with theoretical calculations taking intrinsic size effects, nonlocal response, and plasmon coupling effects into account. When incorporated into PSCs, power conversion efficiencies of up to 8.51% were realizeda 12.5% enhancement compared to devices without Ag QAs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2017/jpccck.2017.121.issue-33/acs.jpcc.7b03763/production/images/medium/jp-2017-03763v_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp7b03763'>ACS Electronic Supporting Info</A></P>