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이시우,박혁상 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.4
열플라즈마를 발생시켜 얻은 초고온 아르곤기체에 삼염화메틸사일린 [Si(CH₃)Cl₃]과 수소기체를 주입시켜 고온 화학반응에 의해 탄화규소 미세분말을 합성하였다. 이 때 최적 수소 농도는 3-4와 몰%로 나타났다. 이보다 적은 경우는 미반응 탄소분이 섞인 무정형의 탄화규소가 생성되는 것을 알았으며 큰경우는 미반응 규소가 생성됨을 알았다. 이 공정에서 얻은 분말은 20-60㎚의 크기를 가진 β-탄화규소로 나타났다. Ultrafine silicon carbide powders were chemically synthesized by introducing trichloromethyl silane and hydrogen into the high temperature thermal plasma argon gas. The optimum concentration of hydrogen was found to be about 3-4 mole%. Free carbon was included when the hydrogen concentration was lower than optimum and free silicon was formed when it was higher than optimum. It was also found out that powders synthesized were β-SiC with size distributions between 20 to 60㎚.
X-ray Nanoscopy Study on Metal Nano-Structure Formation at a Metal-Organic Interface
이시우,조정형,김효정,이수용,이현휘,김남동,신현준,전태열 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
Scanning transmission X-ray microscopy (STXM) with ∼30-nm spatial resolution revealed at annealing effect on the metal-organic interface of an Al layer with a poly (3-hexylthiophene) (P3HT) organic semiconducting layer with and without phenyl-C61-butyric acid methyl ester (PCBM). In the case of a P3HT/Al layer with a high-tensile-strain organic over-layer, the overall interface changed to a zagged morphology with Al nano pillars after thermal annealing. On the contrary, a P3HT:PCBM/Al layer with a less-tensile-strain organic over-layer showed a smooth interface except for a few nano pillars. These interfacial morphology changes were related to the initial strain status and to the relaxation process and the phase separation of P3HT crystals relating to the PCBM. Grazing-incident wide-angle X-ray scattering (GI-WAXS) measurements were also conducted to examine the residual strain and the crystalline properties of P3HT in the presence of PCBM.
이시우,이승영,이기성,우상국,김도경,Lee, Shi-Woo,Lee, Seung-Young,Lee, Kee-Sung,Woo, Sang-Kuk,Kim, Do-Kyung 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.10
고상 반응법을 통해 $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ 페롭스카이트계 산소투과 분리막을 제조하였으며, 미세구조에 따른 산소투과 특성 및 기계적 특성을 고찰하였다. 분리막의 미세구조는 소결온도 및 소결 유지시간을 달리함으로써 조절하였으며, 미세구조에 따른 평균 입경 및 상대밀도의 변화를 평가하였다. 입계 분율의 감소에 따라 산소투과유속이 증가하는 경향을 나타내었으며, 본 연구에서 고찰한 소결조건 중에서는 1300${\circ}C$에서 10시간 유지하여 제조한, 상대밀도가 높고 비교적 입경이 조대한 분리막 시편의 경우, 최대 0.37 ml/$cm^2$${\cdot}$min의 산소투과유속이 특정되었다. 파괴강도는 소결체의 상대밀도에 의존적이었으며, 파괴인성은 결정립의 크기에 따라 증가하는 경향을 나타내었다. Oxygen permeability and the mechanical properties of mixed ionic-electronic conductive $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ perovskite-type membrane, fabricated by solid state reaction, were investigated with regard to microstructure. The microstructure of the membrane was controlled by changing the sintering temperature and holding time. The average grain size and relative density were evaluated as a function of sintering conditions. As the fraction of grain boundary decreased, oxygen permeability showed a tendency to increase. Especially the maximum oxygen flux of 0.37 ml/$cm^2$${\cdot}$min was measured for the specimen sintered at 1300${\circ}C$ for 10 h, which has high density and relatively large grain size. Fracture strength was dependent on the relative density of sintered body, while fracture toughness increased with average grain size.
IT중소기업의 연구개발(R&D) 촉진을 위한 모듈화된 인력지원 시스템 제안
이시우 (사)디지털산업정보학회 2010 디지털산업정보학회논문지 Vol.6 No.2
In this paper, I propose the modular support of IT small companies that assigns specialist on each module and create the module corresponding to R&D processes to small companies in order to support technical difficulties arising in a R&D process of IT small companies. The number of applied target companies is 149 IT small companies and altogether 45 specialist who had supported 10 modules. As a result of observing for two years, I identified that the system helps the technical difficulties.
독일학교의 기본구조와 학교분쟁 해결을 위한 법적 제도에 관한 연구
李時佑 대한교육법학회 2002 敎育 法學 硏究 Vol.14 No.2
1. Die rechtliche Organisation der Deutchen Schulen in den Deutschen Bundesla¨ndern ist in ihren Grendzu¨gen die gleiche. Die Grundstruktur der Deytschen Schulen sind Schulleitung, Lehrerkonferenz und Schulkonferenz, unterscheiden freilich in seinen Akzentuisierungen: hier mehr, dort weniger Autonomie der Schule; hier ein sta¨rkerer Schulleiter, dort eine mit weitreichenden Zusta¨ndigkeiten ausgestattete Lehrerkonferrnz; hier Mitwirkungsrechte der Schu¨ler und Eltern bis hin zur Mitbestimmung, dort auf Anho¨rung oder Beratung Beschra¨nkte Beteiligung; hier Trennung, dort Verzahnung der Organe. 2. In Deutschland beruht die Abgrenzung zwisschen staatlicher Schulaufsicht und kommunaler Schultra¨gerschaft auf der herko¨mmlichen Unterscheidung zwischen inneren und a¨ußeren Schulangelegenheiten. Wa¨hrend der Staat danach fu¨r die Schule verantwortlich ist, sorgen die Gemeinden als Schultra¨ger fu¨r die Errichtung, Organisation, Unterhaltung und Verwaltung der einzelnen Schule. 3. Deutschen Schu¨ler und Eltern sind der Schule und den Schulbeho¨rden nicht schutzlos ausgeliefert. Wenn sie sich durch das Verhalten eines Lehrrers, durch eine Entscheidung der Klassenkonferenz, durch eine Maßnahme der Schulaufsicht oder des Schultra¨gers, durch einen Ablehnungsbescheid des Amtes fu¨r Ausbildungsfo¨rderung usw. beeintra¨chtigt fu¨hlen, konnen sie sich außergerichtlich und gerichtlich dagegen zur Wehr setzen. Sie haben die Mo¨glichkeit, einen formlosen Rechtsbehelf wie Gegenvorstellung und Aufsichtsbeschwerde einzulegen. Gegen einen Verwaltungsakt ko¨nnen sie mit dem fo¨rmlichen Rechtsbehelf des widerspruchs vorgehen. Vor allem aber steht ihnen aufgrund der Gewa¨hrleistung des Art. 10 Abs. 4 Grundgesetz der Rechtsweg zu den Gerichten offen. Von herausragender Bedeutung im Schulverha¨ltnis ist das verwaltungsgerichtliche Verfahren. Außerdem kommen Klagen vor dem Zivilgericht und vor dem Sozialgericht in Betracht.