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김현홍,김성환,김강용,박종남 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Owing to a recent push toward one-dimensional nanomaterials, in this study, we report a seed-mediated synthetic strategy for copper nanowires (Cu NWs) production involving thermal decomposition of metal-surfactant complexes in an organic medium. Ultra-long Cu NWs with a high aspect ratio and uniform diameter were obtained by separating nucleation and growth steps. The underlying mechanism for nanowire formation was investigated, in addition, properties of the obtained Cu NWs were also characterized using diverse analysis techniques. The performance of resulting Cu NWs as transparent electrodes was demonstrated for potential application. This article can provide information on both new synthetic pathway and potential use of Cu NWs.
김현홍,김성환,나희경,손진경,이태걸,박종남 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Appropriate surface designs and precise characterizations of nanoparticles (NPs) are important for biomedical applications of nanomaterials. We report a facile synthetic approach to the preparation of Fe<sub>3</sub>O<sub>4</sub> NPs with different surface charges through exchange with polymeric ligands. An accurate analysis method for characterization of the surface-modified Fe<sub>3</sub>O<sub>4</sub> NPs using a combination of the ToF-SIMS and FT-IR techniques is demonstrated. A comparison of the spatial distribution of the ligand and core particles with ToF-SIMS and FT-IR verified the successful modification and purification. In addition, the surface was shown to play an important role in interactions with live cells in terms of cytotoxicity, cellular uptake, and even gene transfection.
金鉉烘(Hyun-Houng Kim),金眞鎬(Jin-Ho Kim),金亨中(Hyeong-Jung Kim),朴宗培(Jong-Bae Park),愼重麟(Joong-Rin Shin) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
This paper presents a new approach of a evaluation of location marginal prices(LMPs) considering demand response resources in the competitive electricity market. The stabilization of the electric power supply and demand balance has been one of the major important activities in electric power industry. Recently, much attention is paid to the demand-side resources which are responsive to incentives or time-varying prices and existing power system planning and operation activities are incorporated with the so-called demand response resources. In this paper, we first present an analytical method for calculation of LMPs considering demand response resources and then break down the LMPs into three components. In this study, we assume that Korean power system consists of two major regions, one which is the metropolitan and the other is non-metropolitan region. In the case study, we have considered several LMPs cases with different use of locational demand response resource and we can obtain a locational signal to demand response resources. Also, the economics of demand response resources are evaluated, compared with the increase of transmission line capacity and of generation capacity.
金鉉烘(Hyun-Houng Kim),曺基善(Ki-Seon Cho),鄭允源(Yun-Won Jeong),朴宗培(Jong-Bae Park),愼重麟(Joong-Rin Shin) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents a graphical windows-based software for the education and training of transmission network charge. The motivation for the development of the simulator is to provide students with a simple and useable tool for gaining an intuitive feel for transmission network charge. The developed simulator consists of the main module (MMI,GUI), the power flow module (PF), the power flow tracing module (PFT), and usage cost DB module (UCD). Each module has a separate graphical and interactive interfacing window. The developed simulator provides with two power system analysis methods (i.e., DC-PF and Modified DC-PF) and supports the PSS/E input data format to load input data of power system. Also, power flow tracing can be calculate using four methods such as "Felix Wu", "Modified Felix Wu", "DCLF ICRP", and "Reverse MW mile". Results of calculation for transmission usage cost are displayed and compared on the window through the table and/or chart. Therefore, the developed simulator can be utilize as a useful tool for effective education and training of transmission network charge.