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One-Nanometer-Scale Size-Controlled Synthesis of Monodisperse Magnetic Iron Oxide Nanoparticles
Park, Jongnam,Lee, Eunwoong,Hwang, Nong-Moon,Kang, Misun,Kim, Sung Chul,Hwang, Yosun,Park, Je-Geun,Noh, Han-Jin,Kim, Jae-Young,Park, Jae-Hoon,Hyeon, Taeghwan WILEY-VCH Verlag 2005 Angewandte Chemie Vol.44 No.19
<B>Graphic Abstract</B> <P>Accurate to size: Monodisperse magnetic iron oxide nanoparticles with a continuous size spectrum of 6–13 nm have been synthesized by a procedure similar to seed-mediated growth and characterized by transmission electron microscopy (see picture) and magnetic measurements. This method yields monodisperse nanoparticles directly without a size-selection process. <img src='wiley_img/14337851-2005-44-19-ANIE200461665-content.gif' alt='wiley_img/14337851-2005-44-19-ANIE200461665-content'> </P>
디젤 하이브리드 전기자동차의 엔진 정지 및 시동 기능의 개발
박종남(Jongnam Park),박진우(Jinwoo Park),박상민(Sangmin Park),임훈섭(Hunseob Lim),김현옥(Hyunok Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid Electric Vehicle (HEV) has two power sources, one is an internal combustion engine, the other one is an electric motor, and HEV is developed for reducing fuel consumption and emission. The main driving strategy of HEV is start & stop mode and boosting & regeneration mode done by electric motor. Therefore, the effect for fuel consumption by engine start & stop function should be evaluated and optimized in HEV. This paper introduces mild type Diesel HEV and evaluation results of engine start algorithm by electric motor. In addition that, this paper evaluates the contribution of fuel consumption by engine start & stop function based on test results in chassis dynamometer by FTP mode.
Synthesis of Monodisperse Spherical Nanocrystals
Park, Jongnam,Joo, Jin,Kwon, Soon ,Gu,Jang, Youngjin,Hyeon, Taeghwan WILEY-VCH Verlag 2007 Angewandte Chemie. international edition Vol.46 No.25
<P>Much progress has been made over the past ten years on the synthesis of monodisperse spherical nanocrystals. Mechanistic studies have shown that monodisperse nanocrystals are produced when the burst of nucleation that enables separation of the nucleation and growth processes is combined with the subsequent diffusion-controlled growth process through which the crystal size is determined. Several chemical methods have been used to synthesize uniform nanocrystals of metals, metal oxides, and metal chalcogenides. Monodisperse nanocrystals of CdSe, Co, and other materials have been generated in surfactant solution by nucleation induced at high temperature, and subsequent aging and size selection. Monodisperse nanocrystals of many metals and metal oxides, including magnetic ferrites, have been synthesized directly by thermal decomposition of metal–surfactant complexes prepared from the metal precursors and surfactants. Nonhydrolytic sol–gel reactions have been used to synthesize various transition-metal-oxide nanocrystals. Monodisperse gold nanocrystals have been obtained from polydisperse samples by digestive-ripening processes. Uniform-sized nanocrystals of gold, silver, platinum, and palladium have been synthesized by polyol processes in which metal salts are reduced by alcohols in the presence of appropriate surfactants.</P> <B>Graphic Abstract</B> <P>All the same: The synthesis of monodisperse nanocrystals is of key importance for many future applications, because their physical properties depend strongly on their dimensions. Mechanistic studies reveal that monodisperse nanocrystals are produced when a burst of nucleation is combined with a subsequent diffusion-controlled growth process. This Review summarizes recent progress made on the synthesis of monodisperse spherical nanocrystals (TEM image: iron oxide nanoparticles). <img src='wiley_img/14337851-2007-46-25-ANIE200603148-content.gif' alt='wiley_img/14337851-2007-46-25-ANIE200603148-content'> </P>
박종남(Jongnam Park),박상민(Sangmin Park),김현옥(Hyunok Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Much attention and effort are being done by government for environmentally friendly vehicle development and production owing to CO2 emission regulation against warming earth and rising oil price. One of the important things is to develop more fuel efficient and equivalent or better performance vehicle in addition to the development of alternative energy vehicles in case of automotive manufacturers. While USA and Japanese automakers are focusing on the development of gasoline, automakers have been developing new technologies of diesel engine that is more efficient than gasoline engine for CO2 emission regulations and market trends. However, European automakers are releasing the outcomes of diesel hybrid key components that are developed by themselves. This paper intends to analyze and compare the overseas HEV development examples and effects and to review the appropriateness of diesel HEV development through coming technology development trends, system efficiency and performance, etc.
박종남(Jongnam Park),김재호(Jaeho Kim),차경옥(Kyungok Cha) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
With the ever increasing demanded on automatic transmission, improve performance, add air<br/> conditioning, meet noise and pollution legislation the need to evaluate and improve cooling system<br/> performance at the design stage is becoming increasingly important. ATB is the abbreviation for Air-to-<br/> Boil. This is the extrapolated ambient temperature at which the coolant would boil. ATB is the measure<br/> of cooling system capability. Coolant temperature control insures durability and long engine life in<br/> vehicle users application. A numerical simulation is conducted to compare the various experimental<br/> results by the "e-NTU" method.<br/> The purpose of this paper is to suggest the matching technique of vehicle cooling system including<br/> automatic transmission by means of various experimental results and comparing with simulation results.
디젤 하이브리드 전기자동차 연비 및 차량성능에 관한 실험적 고찰
박상민(Sangmin Park),박종남(Jongnam Park),임훈섭(Hunseob Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Many countries intensify the emission regulation to cope with increasing environmental pollution. The need for reducing environmental pollution asks the modification of conventional vehicle technologies and auto manufacturers and institutes are trying to develop environmentally friendly vehicles. There are several types of environmentally vehicles being developed by auto manufacturers. Hybrid technology is most applicable one among them in actuality. Main power source of HEV (Hybrid Electric Vehicle) is diesel engine and assistant power source is electric motor. Electric motor has high torque characteristics at low speed, so it assists torque at low rpm range where engine has low torque. In addition that electric motor has torque boosting functionality at normal driving in case of full acceleration or uphill driving. etc. Electric power for operating electric motor is supplied by high voltage battery charged by electric motor during driving with surplus power. More fuel economy and less emission can be achieved by these driving mechanism. Ssangyong Motor Company developed diesel HEV to meet emission regulation and higher performance using hybrid technologies mentioned above. We analyze hybridization effect for fuel economy and performance, and intend to utilize the analyzed data for optimized further hybrid system development.