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Stable antimony-doped tin oxide nano-sols and their films produced by a sol-coating method
구상만,Seong Je Jeon,Jai Joon Lee,Jun Tae Kim 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.4
The preparation of ethanol-based antimony-doped tin oxide (ATO) nano-sols and their films are described. Aggregates of antimony-doped tin oxide (ATO) nanoparticles were synthesized by a hydrothermal method in an autoclave. After peptization with tetramethylammonium hydroxide and solvent-exchange to ethanol, highly stable ethanol-based ATO nano-sols with solid contents up to 20 wt% were prepared. Transparent ATO films were formed on polyethylene terephthalate (PET) films using the ATO nano-sol by a spin coating method. The effects of antimony content and solid content on packing density and the resistivity of the ATO films were studied. The preparation of ethanol-based antimony-doped tin oxide (ATO) nano-sols and their films are described. Aggregates of antimony-doped tin oxide (ATO) nanoparticles were synthesized by a hydrothermal method in an autoclave. After peptization with tetramethylammonium hydroxide and solvent-exchange to ethanol, highly stable ethanol-based ATO nano-sols with solid contents up to 20 wt% were prepared. Transparent ATO films were formed on polyethylene terephthalate (PET) films using the ATO nano-sol by a spin coating method. The effects of antimony content and solid content on packing density and the resistivity of the ATO films were studied.
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Silver complex inks for ink-jet printing: the synthesis and conversion to a metallic particulate ink
구상만,Jai Joon Lee,Jin Chul Park,Min Hwan Kim,Tae Sun Chang,Sun Teak Kim,Young Chul You,Sang Jin Lee 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
A solution ink of a silver complex was prepared by dissolving silver neodecanoate in xylene up to a concentration of 25% silver (Ag-SI). Spun-coated Ag-SI films were thermally decomposed to metallic silver films with resistivity values of less than 4.5× 10−5 Ω·cm, after sintering above 160oC. In addition, a silver nanoparticle ink (Ag-PI) could be prepared by removing a large amount of neodecanoic acid from the Ag-SI by reduction with phenylhydrazine. The sintering temperature for Ag-PI with a resistivity below 1×10−4 Ω ·cm was reduced from 160oC to 130oC by using Ag-PI instead of Ag-SI. However, Ag-PI was rather unstable, as a precipitation occurred in one week at room temperature. Finally, Ag-SI was tested for production of a metallic film on a polyamide as a metal complex ink in a drop-on-demand ink jet printer. The results indicated that it would be very suitable as a conducting ink.
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Sol-Gel Process를 이용한 SiO<sub>2</sub>/TiO<sub>2</sub> 복합 미립자의 합성
구상만,이동현,류창석,이용은,Koo, S.M.,Lee, D.H.,Ryu, C.S.,Lee, Y.E. 한국공업화학회 1997 공업화학 Vol.8 No.2
응집이 없는 단분산의 $SiO_2/TiO_2$ 복합 미립자를 얻기 위하여 $TiO_2$seed가 분산되어 있는 에탄올 수용액과 TEOS (Tetraethyl Orthosilicate)를 에탄올에 녹인 용액을 혼합하여 $TiO_2$ 주위에서 TEOS가 가수분해 및 축합 반응이 일어나도록 유도하여 복합 미분말을 제조하였다. 촉매로 암모니아를 사용하였고, 반응온도는 실온이었다. 반응변수는 TEOS의 농도, 암모니아의 농도, $TiO_2$ seed의 크기 및 양이었다. 응집이 없는 복합 미립자를 얻기 위한 최적조건은 [TEOS]=0.3M, [$NH_4OH$]=0.7M, $TiO_2$ seed의 크기가 200~300 nm이었고, 이때 $0.8{\sim}0.9{\mu}m$의 입자크기를 갖는 복합입자를 얻을 수 있었다. Monodisperse, spherical $SiO_2/TiO_2$ composite fine powders were prepared by modified Sol-Gel process which $TiO_2$ fine Powders was used as a seed particles for condensation of TEOS (Tetraethyl Orthosilicate). The reaction was carried out under $N_2$ atmosphere at ambient temperature using $NH_3$ as a catalyst. Ethanol was used as a solvent. Drying process was carried out with vacuum trap which cooled by liquid $N_2$. The reaction variables were the concentration of TEOS, the concentration of ammonia, the size of $TiO_2$ seed and molar ratio of $SiO_2/TiO_2$. The optimum condition for the preparation of $SiO_2/TiO_2$ composite fine powders without agglomeration was [TEOS]=0.3M, [$NH_3$]=0.7M, size of $SiO_2/TiO_2$ seed = 200~300nm.
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구상회,이현희,Koo, Sang Hoe,Lee, Hyun-Hee 한국교육시설학회 2019 敎育施設 Vol.26 No.3
As the information age matures, the learning style of youth is changing rapidly. Students study at a variety of places such as cafe or lobbies utilizing various digital learning devices. Along with the place changes, learning methods are also changing. Student-centered learning methods such as smart learning, collaborative learning, and activity-based learning are increasingly being utilized instead of the traditional instructor-centered learning in which knowledge is unilaterally delivered. Accordingly, many universities are remodeling central libraries, and they are also transforming lobby spaces of the college buildings into simple but useful learning spaces. In this study, we analyze the characteristics of learning spaces in universities from the standpoint of the students. According to the analysis, overall satisfaction is high in terms of comfortable physical learning environments such as Wi-Fi, furniture, lighting, etc. But the spaces are still optimized for individual and intensive learning. There seems to be a lack of effort to support collaborative learning or activity-based learning. This observation is confirmed by the characteristics of the central library, and it is considered that the reason why the college buildings are preferred by students is that college buildings are more suitable for collaborative or activity-based learning than libraries.
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구상회(Koo, Sang Hoe),이찬희(Lee, Chan Hee),구자헌(Koo, Ja Heon),정준(Jeong, Jun Ho) 대한부동산학회 2021 大韓不動産學會誌 Vol.39 No.1
산업단지는 국가경제성장과 국토균형발전의 정책수단으로서 지역 및 국가발전에 많은 기여를 해왔지만, 조성 후 30년 이상된 노후산업단지 비율이 높아지면서 산업단지의 혁신이 요구되고 있는 실정이다. 이에 본 연구는 전국의 1,220개 산업단지 중, 단지면적이 30만㎡ 이상인 157개 국가·일반산업단지의 생산성과에 영향을 주는 내외부의 영향요인을 탐색하고, 산업단지 생산액에 미치는 영향도를 분석하였다. 산업단지 생산성과는 산업단지 자체의 속성요인 뿐만 아니라 산업단지 위치에 따른 지역요인 및 산업단지 지원정책과, 상위수준 요인인 산업별 경기변동 요인에 의해 포섭되는 계층적 구조의 데이터 특성을 감안하여 위계선형모형을 통해 분석한 결과는 다음과 같다. 첫째, 산업단지들의 생산성과는 각 산업단지의 내부속성(계획적, 물리적, 입지특성, 노후도)에 앞서 각 산업단지가 위치한 지역과 입주업종에 교차분류된(cross-classified) 형태로 내포되어 있다. 둘째, 생산성과에 긍정적인 영향을 미치는 요소로는 업종별 총 생산액, 산업단지별 산업시설용지 면적, 산업단지 소재지역의 인구수, 조성완료 후 경과년도가 있으며 공공시설 면적률이 커질수록 생산성과를 낮추는 것으로 분석됐다. 산업단지별 생산성과를 측정하기 위해서는 상위수준의 외적요인 통제하에 산업단지 자체의 내부속성 요인들의 영향력을 추정할 때 정확도를 더 높일 수 있다. Industrial complexes have contributed crucially to regional and national development as a policy tool for national economic growth and balanced national development, but as the ratio of old industrial complexes that have been built more than 30 years ago has increased, an innovation of industrial complexes is required. Therefore, this study is conducted with 157 national and general industrial complexes with an area of over 300,000㎡ out of 1,220 industrial complexes nationwide. The internal and external factors affecting the production performance of general industrial complexes were studied, and the degree of influence on the output value of each industrial complex was analyzed. The production performance of industrial complex is the data of a hierarchical structure that is covered not only by the attribute factors of the industrial complex itself, but also by regional factors and industrial complex support policies according to the location of the industrial complex, and economic fluctuations by industry, which is a higher-level factor to the production performance of industrial complex. The results of analysis through the hierarchical linear model considering the characteristics are as follows. First, the production performance of industrial complexes is implicit in the form of cross-classified in the region where each industrial complex is located and the main tenant business type of the industrial complex beside the internal properties of each industrial complex. Second, factors that have a positive effect on the production performance are the total production output by the industry, the area of the industrial facility site by the industrial complex, the number of population in the industrial complex, and the year after completion. When external factors are controlled in the model, it is possible to estimate the impact of internal factors on industrial site production performance more accurately.
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Sol - Gel process 를 이용한 SiO2 / TiO2 복합 미립자의 합성
구상만,이동현,류창석,이용은 ( S . M . Koo,D . H . Lee,C . S . Ryu,Y . E . Lee ) 한국공업화학회 1997 공업화학 Vol.8 No.2
응집이 없는 단분산의 SiO₂/TiO₂ 복합 미립자를 얻기 위하여 TiO₂ seed가 분산되어 있는 에탄올 수용액과 TEOS(Tetraethyl Orthosilicate)를 에탄올에 녹인 용액을 혼합하여 TiO₂ 주위에서 TEOS가 가수분해 및 축합 반응이 일어나도록 유도하여 복합 미분말을 제조하였다. 촉매로 암모니아를 사용하였고, 반응온도는 실온이었다 반응변수는 TEOS의 농도, 암모니아의 농도, TiO₂ seed의 크기 및 양이었다. 응집이 없는 복합 미립자를 얻기 위한 최적조건은 [TEOS]=0.3M, [NH₄OH]=0.7M, TiO₂seed의 크기가 200∼300 nm이었고, 이때 0.8∼0.9㎛의 입자크기를 갖는 복합입자를 얻을 수 있었다. Monodisperse, spherical SiO₂/TiO₂ composite fine powders were prepared by modified Sol-Gel process which TiO₂ fine powders was used as a seed particles for condensation of TEOS (Tetraethyl Orthosilicate). The reaction was carried out under N₂ atmophere at ambient temperature using NH₃ as a catalyst. Ethanol was used as a solvent. Drying process was carried out with vacuum trap which cooled by liquid N₂. The reaction variables were the concentration of TEOS, the concentration of ammonia, the size of TiO₂ seed and molar ratio of SiO₂/TiO₂. The optimum condition for the preparation of SiO₂/TiO₂ composite fine powders without agglomeration was [TEOS]=0.3M, [NH₃]=0.7M, size of TiO₂ seed = 200∼300nm.
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