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Bi계 고온초전도체 2223상의 생성과 미세조직에 미치는 하소회수와 소결시간의 영향
주광철,이완재 한양대학교 공학기술연구소 1995 공학기술논문집 Vol.4 No.1
The Bi-Sr-Ca-Cu-O system precursor powders were synthesized by the thermal decomposition of an organic acid salt to get the homogeneous composition. These powders were milled by a planetary mill to make them fine grains. After milling, calcination was carried out at 750℃ for 8 hours in air. The milling and calcination were repeated twice. The grain size and shape were examined by Laser particle size analyzer and SEM. Annealing was done at 860℃ for 20, 40, 60 hours in air. The Tc of specimens annealed at 860℃ for 60 hours were measured with changes of resistance by a DC four-probe method. The results attained were as follows ; 1) The synthesized powders were fine and homogeneous in composition. 2) The finer the grain size the faster the grain growth during annealing. 3) Bi-2201 phase was produced by the calcination. 4) Bi-2223 phase formation was suppreseed by the excess absorption of oxygen. 5) The production of high-Tc 2223 phase was expected by controlling the annealing atmosphere, time and cooling rate.
6개원소로 이루어진 짝이중결합화합물과 AsCl_3와의 반응
주완철,육명화,김용주 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.2
6개의 원소로 이루어진 오르토히드록시짝이중결합화합물, 즉 시남알데히드-오르토-히드록시아닐(cinnam-aldehyde-ortho-hydroxyanil), 벤질모노히드록시아닐(benzil-mono-hydroxyanil), 오르토-히드록시벤잘아세톤페논(ortho-hydroxy benzalacetophenone)과 알진트리클로라이드(AsCI_3)와의 반응으로부터 고체반응생성물을 분리해 냈다. 이들 반응생성물의 적외선 및 자외선분광학으로부터, 이들 모든 반응생성물은 비소의 전하이동착물임을 획인했다. 이 반응으로부터 3원자가 비소화합물의 화학적거동이 인의 3원자가 화합물과 유사하지 않다는 것을 알 수 있었다. Solid products were isolated by the reaction of orthohydroxy-6-membered conjugated system such as cinnamaldehyde-ortho-hydroxyanil, benzil-mono-orthohydroxyanil and ortho-hydroxybenzalacetophenon with AsCl_3. All of these products were confirmed to be Charge-transfer complexes of As from the examination of IR and UV spectra. It could be found that the chemical behavior of trivalent As is not analogous with that of triv alent P.
주완철,박경래 成均館大學校 1979 論文集 Vol.26 No.-
Previous investigators have prepared carbamates by the Hoffmann-like rearrangement of amides using lead tetraacetate as an oxidation agent. Almost of these investigations are concerned mainly with the procedures of the carbamate preparations. For the formation of carbamates by the Hoffmann-like rearrangement of amides it seems very important to know the influences of the character of amides and also the acidity of alcohols. In this work we have studied at first the influences of amides with electron withdrowing and donating character upon the formation of carbamates. From our results we have found that there is no remarkable influence of amides on account of the yield or the reactivity. We have also found that this reaction does not initiate without base. Therefore we have concluded that the formation of isocyanate intermediate in the process of carbamate preparation occurs by a spontaneous intramolecular synchronous rearrangement and not by the free nitrene formation, and that the catalytic effect of a base, which acts to displace a nitrogen bonded proton of the amide and initiates the reaction, must be accounted as an important factor.
새로운 방법에 의한 1,1-R,R'-2,3,4,5-테트라페닐-1-실라사이크로펜타디엔의 합성
주완철,흥장환,최석봉 성균관대학교 기초과학연구소 1988 論文集 Vol.39 No.1
A new synthesis of 1,1-R, R',-2, 3, 4, 5-tetraphenyl-1-silacyclopentadiene was described. It was synthesized from one-pot reaction of 1,4-dilithio-1, 2, 3, 4-tetraphenylbutadiene with R_nSiCl_4-n (n=0, 1, 2), where 1, 4-dilithio-1, 2, 3, 4-tetraphenyl butadiene was prepared from the reaction of diphenyl acetylene and lithium metal in ether solution with good yield (80∼85%).
6개 원소로 이루어진 짝이중결합화합물과 R_2AsCI와의 반응
주완철,이용암,유응철 성균관대학교 기초과학연구소 1986 論文集 Vol.37 No.2
From the reactions of orthohydroxy-6-membered conjugated system, benzil-mono-orthohydroxyanil, with Me_2AsCl and chloro [Toluene-(2, 3)-dithiolato(2)] arsenic (Ⅲ), reaction products was isolated. From the IR and NMR-spectroscopic analysis for these reaction products, it is confirmed that reaction products are charge-transfer complexes of As. From these results, we found that the chemical behaviour of trivalent As is not analogous to trivalent P.
1,1-dichloro-2,3,4,5-tetraphenyl-1-silacyclopentadiene의 합성과 이에 대한 Mass Spectroscopic Study
주완철,이동석 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.2
1, 1-Dichloro-2, 3, 4, 5-tetraphenyl-l-silacyclopentadiene is synthesized from the reaction of diphenylacetylene with metal and tetrachlorosilane, where the optimal reaction conditions are also studied. From-the mass spectroscopic study of this 1,1-dichloro-2, 3, 4, 5-tetraphenyl-l-silacyclopentadiene the elimination of meta-stable dichlorosilylene species is confirmed.
이완옥,이용주,김익수 木浦大學校沿岸生物硏究所 1990 沿岸生物硏究 Vol.7 No.1
Marine fishes collected the inshore waters of the Kohung Peninsula, southern part of Chollanam-do from June to November in 1990 was studied. They were classified into 41 families and 93 species. The list of the collection including collected date, nember of specimen and Korean name was represented in this paper.
컴퓨터 비젼 방법을 이용한 3차원 물체 위치 결정에 관한 연구
장완식,김경석,이성민,주철,김재확,김대현 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
This study shows an alternative method for the determination of object's position, based on a computer vision method. This approach develops the vision system model to define the reciprocal relationship between the 3-D real space and 2-D image plane. The developed model involves the bilinear six-view parameters, which is estimated using the relationship between the camera space location and real coordinates of known position. Based on the estimated parameters in independent cameras, the position of unknown object is accomplished using as sequential estimation scheme that permits data of unknown points in each of the 2-D image plane of cameras. This vision control method is the robust and reliable, which overcomes the difficulties of the conventional research such as precise calibration of the vision sensor, exact kinematic modeling of the robot, and correct knowledge of the relative positions and orientation of the robot and CCD camera. Finally, the developed vision control method is tested experimentally by performing determination of object position is the space using computer vision system. These results show the presented method is precise and compatible.