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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%).
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.
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.
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.
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.
IAEA의 기준모델과 MASCOT 프로그램을 이용한 중저준위방사성폐기물 천층처분시설 안전성평가
김현주,박주완,김창락 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.2
IAEA가 제시한 중·저준위 방사성폐기물 천층처분시설 기준 안전성평가 사례에 대해 MASCOT프로그램을 이용하여 안전성평가를 수행하였다. 이를 위해 기준시나리오에 대한 개념 모델을 개발하였다. 지질계와 생태계의 연결매체인 우물을 통한 지하수 이동경로에 대한 평가를 수행하였고 생태계 모델에서는 구획모델을 적용하여 인간활동을 통한 최종 방사선적 영향을 평가하였으며, 다른 평가 결과와의 비교를 통해 기준시나리오에 대한 개념모델의 적합성을 조사하였다. 본 연구 결과는 구획모델을 이용한 지하수 유동경로에 대한 대표적인 개념모델을 총체적인 처분시스템의 안전성평가에 만족스럽게 이용할 수 있다는 것을 보여주었다. 또한 MASCOT프로그램을 이용하여 복잡하고 다양한 이동경로를 통한 천층처분시설의 방사선적 안전성평가가 가능함을 보였다. A reference scenario of vault safety case prepared by the IAEA for the near-surface disposal facility of low-and intermediate-level radioactive wastes is assessed with the MASCOT program. The appropriate conceptual models for the MASCOT implementation is developed. An assessment of groundwater pathway through a drinking well as a geosphere-biosphere interface is performed first, then biosphere pathway is analysed to estimate the radiological consequences of the disposed radionuclides based on compartment modeling approach. The validity of conceptual modeling for the reference scenario is investigated where possible comparing to the results generated by the other assessment. The result of this study shows that the typical conceptual model for groundwater pathway represented by the compartment model can be satisfactorily used for safety assessment of the entire disposal system in a consistent way. It is also shown that safety assessment of a disposal facility considering complex and various pathways would be possible by the MASCOT program.
이완주 용인대학교 자연과학연구소 2004 自然科學硏究所論文誌 Vol.8 No.2
In the recognition system of vehicle number plate, it is very important to correctly extract the character from the number plate. For the extraction of vehicle number plate in a vehicle image, we used the method which extracts vehicle plate area from a vehicle image using binary with multi- thresholding. The plate image is partitioned into regions of predefined size and a threshold is computed for each regions. computed thresholds are further refined through relaxation with thresholds of neighboring regions. Learning vector quantization, one of practical neural network, is used to recognize extracted numbers and characters in the plate. Successful extraction of number plate records about 96% over 1000 test plates and recognition rate showed above 85% for the whole rest set images regardless of types of number plates.
Sm₂O₃doped CeO₂의 미분말 합성 및 소결특성
김동완,박민우,이주신 경성대학교 2000 論文集 Vol.21 No.1
10mol% Sm₂O₃ CeO₂fine powders were synthesized by the coprecipitation method and then their powder characteristics and sintering behavior were studied. The characterization of powders has been investigated using thermogravimetry and differential thermal analysis for thermal analysis, X-ray diffraction for phase identification, Brunauer-Emmett-Teller, X-ray diffraction-line broadening and transmission electron microscopy for particle size and morphology determination. The sintering behavior were investigated by means of the sintering density measurements. The characteristics of powders prepared by the coprecipitaion method and their sintering behavior are discussed.