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김일진 ( Il Jin Kim ),박기배 ( Kee Bae Park ) 한국센서학회 2010 센서학회지 Vol.19 No.2
Hydrogen gas sensors were fabricated using PdOx loaded with SWNTs. The nanoparticle powders of SWNTs-PdOx composite were deposited on Si wafer substrates by a vacuum filtering deposition method. The fabricated sensors were tested against hydrogen gas. The composition ratio that exhibited the highest response to hydrogen gases was SWNTs:PdOx=98:2 in wt% ratio at operating temperature of about 150 oC. The response and recovery times were shorter than 1.0 min. in presence of 1000 ppm hydrogen.
리튬전지용 에테르가 기능화된 이온성 액체 기반 이온성 액정 전해질의 전기화학적 특성
김일진 ( Il Jin Kim ),김기수 ( Ki Su Kim ),이진홍 ( Jin Hong Lee ) 한국공업화학회 2020 공업화학 Vol.31 No.3
본 연구에서는 에테르가 기능화된 이온성 액체인 [DMIm][MPEGP] (1,3-dimethylimidazolium (2-methoxy(2-ethoxy(2-ethoxy)))- ethylphosphite)와 리튬염인 LiTf2N (lithium bis(trifluoromethanesulfonyl)imide)을 혼합하였고, 리튬염의 함량을 조절하여 전해질을 특성을 조사하였다. 제조된 전해질은 리튬염 혼합에 따라 불투명해지고 흐름성이 제한된 열방성 액정을 형성하였으며, 이때 리튬염의 함량에 따라 형성되는 이온성 액정의 자기조립구조와 이온 전도 현상을 다양한 분광학적 분석을 통해 조사하였다. 그 결과 이온성 액정의 향상된 이온전도도는 정렬된 구조를 통한 이온 전도 특성과 관계가 있음을 확인하였으며, 리튬이온전지 특성 평가에서 우수한 전기화학적 특성을 나타냄을 확인하였다. In this study, a series of ionic liquids based electrolytes for lithium batteries were prepared by mixing the anion functionalized ionic liquid, [DMIm][MPEGP] (1,3-dimethylimidazolium (2-methoxy(2-ethoxy(2-ethoxy)))-ethylphosphite), with the lithium salt, LiTf2N (lithium bis(trifluoromethanesulfonyl)imide), and the concentration of lithium salt was varied between 0 and 3.0 molar ratio. We observed the ionic mixtures became opaque and spontaneously aggregated to form a thermotropic ionic liquid crystal. Extensive spectroscopic examinations of the ionic liquid crystals were carried out to investigate their self-organized structures and the ion transport behavior depending on the concentration of lithium salt. An increase in the ionic conductivity was observed for the ionic liquid crystals related to the ability to form ion diffusion pathways along the ordered structures, resulting in improved electrochemical performances of lithium batteries.
효율적인 멀티미디어 데이터 전송을 위한 CDMA - 2000망의 특성 분석 연구
김일진(Kim Il-Jin),정진환(Jeong Jin-Hwan),유혁(Yoo Chuck) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
휴대전화는 기존의 음성 통신 기기에서 데이터 통신 기기로 확대 발전하고 있으며 지원되는 데이터 통신대역폭도 점차 고속화되어 가고 있다. 최근에는 이러한 대역폭을 이용한 멀티미디어 서비스가 시작되고 있으나, 무선망에 대한 정확한 분석 없이 기존 유선망의 특성에 기반하여 서비스를 제공하고 있다. 본 논문에서는 효과적인 멀티미디어 데이터 서비스를 위해, CDMA-2000 무선망을 대역폭, 패킷 지연 시간 및 에러율 측면에서 측정하고 그 결과를 분석한다.
양종인,김일진,임한조,한상도,정관수 ( Jong In Yang,Il Jin Kim,Han Jo Lim,Sang Do Han,Kwan Soo Chung ) 한국센서학회 1998 센서학회지 Vol.7 No.3
The sensing and electrical characteristics of WO₃-based n-type semiconductor gas sensors are investigated. In normal air condition, TiO₂(4 wt.%)-doped WO₃-based sensor fabricated without any binder shows the grain boundary (GB) potential barrier height of 0.26 V. Sensors fabricated with alumina, PVA and silica sol binders show 0.17, 0.22 and 0.26 V of GB potential barrier height, respective In the ambience of 120 ppm NO_x concentration, the GB potential barrier height of the sensor fabricated without binder is increased to 0.59. The sensors were fabricated with alumina, PVA, silica sol binders show 0.43. 0.66 and 0.52 V of potential barrier, respectively. Thus the variation of the potential barrier at GB is largest in the sensor fabricated with the PVA binder. This is found to be the main reason why the sensor fabricated with the PVA binder shows the best sensitivity. It is also found that the decrease of sensitivity at a temperature higher than the optimum operation temperature is due to the temperature dependence of the sensor resistance in normal air condition rather than the desorption of the adsorbed NO_x, gas particles. In the ambience of 250 ppm CO concentration, the GB potential barrier heights of the sensors fabricated without binder and with PA binder are about 0.2 V showing negligible change compared to the case of normal air ambience. This fact indicates that these sensors are good candidates for the selective detection of NO_x, gas in the mixture of CO and NO_x gases.
스마트 윈도우용 가교 열감응성 폴리(N-이소프로필아마이드) 겔 소재의 제조 및 특성 - 물/글리세롤 혼합용매 중의 글리세롤 함량의 영향 -
박재형,김일진,이동진,심재학,송민섭,이영희,유중환,김한도,Park, Jae-Hyong,Kim, Il-Jin,Lee, Dong-Jin,Sim, Jae-Hak,Song, Min-Seop,Lee, Young-Hee,Yoo, Jung-Whan,Kim, Han-Do 한국청정기술학회 2018 청정기술 Vol.24 No.2
온도 변화에 따라 상 전이를 나타내는 열 감응성 고분자는 외부 온도 감응으로 태양광 투과 조절이 가능하므로 스마트 윈도우용 소재로 적용 가능하다. 넒은 온도 범위에서 사용 가능한 스마트 윈도용 열감응성 고분자의 개발은 바람직하다. 고 성능스마트 윈도우용 소재를 얻기 위하여, 단량체 N-isopropylacrylamide, 가교제 N, N'-methylenebisacrylamide (MBAm), 산화개시제 ammonium persulfate (APS)/촉매 tetramethylene diamine 및 혼합용매(물/글리세롤)을 사용하여 3차원의 열감응성(thermoresponsive) poly(N-isopropylacrylamide) (PNIPAm) 겔을 제조하였다. 본 연구에서는 혼합용매 중의 글리세롤의 함량이 가교된 PNIPAm 겔 필름의 하한임계온도(low critical solution temperature, LCST), 어는점 및 태양광의 투광도에 미치는 영향을 조사하였다. 글리세롤 함량이 0 wt%에서 10 wt%로 증가하면 PNIPAm 겔 필름의 LCST/어는점은 각각 $34.3/6.3^{\circ}C$에서 $28.2/-6.5^{\circ}C$로 감소함을 알 수 있었다. LCST보다 낮은 $25^{\circ}C$에서는 본 연구에서 합성한 모든 PNIPAm 겔 필름은 투명(광 투과)하지만 LCST보다 높은 $45^{\circ}C$에서는 불투명하다는 것을 알 수 있었다. 이러한 결과는 본 연구에서 합성한 PNIPAm 겔 소재는 $-6.5^{\circ}C$ 부근에서도 스마트 윈도우용 소재로 활용할 가능성이 높음을 알 수 있다. Thermo-responsive polymers that exhibit phase transition in response to temperature change can be used as materials for smart windows because they can control solar light transmission depending on the outside temperature. The development of thermo-responsive polymers for smart windows that can be used over a wide temperature range is desirable. To obtain high performance smart windows materials, three-dimensional thermo-responsive poly(N-isopropylacrylamide) (PNIPAm) gels were prepared by free radical polymerization from monomer N-isopropylacrylamide, N, N'-methylenebis acrylamide (MBAm) as a crosslinking agent, ammonium persulfate (APS) as a strong oxidizing agent/tetramethylene diamine as a catalyst, and a mixture of two solvents (water/glycerol). This study examined the effect of glycerol content on the lower critical solution temperature (LCST), freezing temperature and the solar light transmittance of crosslinked PNIPAm gel films. The LCST and freezing temperature of PNIPAm gel films were found to be significantly decreased from 34.3 and $6.3^{\circ}C$ to 28.2 and $-6.5^{\circ}C$ with increasing glycerol content from 0 wt% to 10 wt%, respectively. It was found that the transparent PNIPAm gel films at $25^{\circ}C$ (temperature < LCST) were converted to translucent gels at higher temperature ($45^{\circ}C$) (temperature > LCST). These results suggested that the crosslinked PNIPAm gel materials prepared in this study could have high potential for application in smart glass materials.
한국 전통마을의 형성과 발전에 관한 연구 -경남 산청 단계마을을 중심으로-
이규성,김일진,Lee, Kyu-Sung,Kim, Il-Jin 한국건축역사학회 1993 건축역사연구 Vol.2 No.1
The objective of this study is to describe more positively and concretely the entity of traditional village through the quantitative and scientific analysis process using positive data. Dan-Gye, a traditional village in San-Cheong, has been populated since more than 500 years ago because of its ideal conditions for settlement. In this study, the fluctuations on the numbers of households in Dan-Gye were analyzed from the first settlement era to the present, and the transformations of housing sites and roads since 1913 were also analyzed. The results are as follows. 1) The village Dan-Gye has a history of more than 500 years, and the first inhabitants were the Ryus. As time went by, the Ryus' power became weak gradually, but the powers of the Kwons and the Parks who had flowed later into this village became prosperous to make up a prominent family village in the late period of Cho-Sun dynasty. Such powers had reached the peak in the early period of Japanese occupation, and although the powers became weak gradually after that time, those two families have overwhelmed other families in population and possession of large houses until now. But as the confucianism in every-day life fell off and the inhabitants moved to cities, the existence of a family community became meaningless. 2) The Kwons and the Parks have possessed the large parts of the village's housing sites. As time went by, the sites have been divided and fields have been changed to housing sites for the increasing families, and such division and change have been made chiefly on perimeter areas. 3) The characteristics of the road in Dan-Gye where traditional roads existed began to be destroyed by Japanese construction of new roads, and such destruction has continued due to the bank construction after a flood and the road constructions after 1970s.