n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구

유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.

연속파형 Nd:YAG 레이저를 이용한 SM45C 용접특성

유영태,노경보,오용석 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2

The Nd:YAG laser in combination with the optical fiber increase the automation and the flexibility of a whole industry. The Nd:YAG laser welding process in one of the most advanced manufacturing technologies owing to its high speed and penetration. This paper describes the weldability of SM45C carbon steel for machine structural use by Nd:YAG laser. Major process parameters were position of focus, travel speed and laser power. The results showed that peneration depth of the weld was increased with increasing applied laser power. Microstructural examinations and calculations and indicated that the microstructure of the laser weld, which experienced very high heating and cooling cycle during welding process. The results of this study provide application possibility of Nd:YAG laser welding for SM45C carbon steel

건강한 한국인에서의 배변 조영술 소견

나용호,장명규,김태현,김형언,유광현,진경민 大韓消化器病學會 1995 大韓消化器病學會誌 Vol.27 No.3

원발성 하지정맥류에 대한 임상적 고찰

김형태,조원현,박흥수,이상목,정기용,김유사 大韓脈管外科學會 1995 大韓脈管外科學會誌 Vol.11 No.2

그람양성구균에 대한 Teicoplanin과 Vancomycin의 시험관내 항균력

최태열,김경숙,전용관,서일혜,김정욱,이웅수,안정열,김홍석,정재용,최효선,김덕언,유진우 대한감염학회 1994 감염 Vol.26 No.1

An increasing frequency of methicillin resistant S. aureus(MRSA), methicillin resistant coagulase negative staphylococci(MRCNS) and Enterococcal infection have been observed in recent years. Teicoplanin is a new glycopeptide antibiotic obstained from the Actinoplanes teicomycetius. The molecular structure and spectrum of antimicrobial activity of teicoplanin is simillar to those of vancomycin, and has been reported to have an excellent in vitro and in vivo effect against various gram-positive infections. Therefore, we evaluated the in vitor susceptibility of gram positive cocci, such as, S. aureus, coagulase negative Staphylococci(CNS), and Enterococci to teicoplanin and vancomycin. The total 253 strains consisted of MSSA(40), MRSA(53), MSCNS(47), MRCNS(48), and Enterococci(65). They were assayed by disc diffusion and agar dilution. During the study, 57% of S. aureus and 49% of CNS showed resistance to methicillin. The inhibitory diameter of teicoplanin was 15-20mm in MSSA, 12-19mm in MRSA, 13-24mm in MSCNS, 11-23mm in MRCNS, and 15-22mm in Enterococci respectively, and showed sensitivity in all but 8 strains(3.2%). The range of the minimum inhibitory concentration (MIC) of teicoplanin to MSSA, MRSA, MSCNS, MRCNS and Enterococci were 9.12-2.0㎍/ml, 0.25-2.0㎍/ml, & 0.25-32㎍/ml, 0.12-1.0㎍/ml respectively. One case of S. haemolyticus was resistant to teicoplanin (32㎍/ml) by the agar dilution method. Eight minor (3.2%) and one major(0.4%) error was observed when the MIC and disk diffusion data were correlated with teicoplanin. As for vancomycin the inhibitory diameter was 17-21mm in MSSA, 15-21mm in MRSA, 18-26mm in MSCNS, 18-25mm in MRCNS, and 16-22mm in Enterococci respectively. The range of the MIC of vancomycin to MSSA, MRSA, MSCNS, MRCNS, and Enterococci were 0.25-1.0㎍/ml, 0.25-4.0㎍/ml, 0.5-2.0㎍/ml and 0.5-2.0㎍/ml respectively. One minor error (0.4%) was seen with the vancomycin disk. The MIC90 of MSSA and MRSA exhibited the same results in teicoplanin (1.0㎍/ml, 1.0㎍/ml), and vancomycin(2.0㎍/ml, 2.0㎍/ml). MSCNS and MRCNS exhibited greater MIC90 with teicoplanin(4.0㎍/ml, 8.0㎍/ml) than vancomycin(2.0㎍/ml, 2.0㎍/ml). Incontrase Enterococci were more susceptible to teicoplanin(0.5㎍/ml) than to vancomucin (2.0㎍/ml). Results from this analysis indicated that both teicoplanin and vancomycin were very excellent for gram positive infections, especially those resistant to methicillin.

비호지킨 림프종의 임상적 고찰

김태원,조은택,조기섭,정재용,허재봉,장영,박유환,정춘해 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1

A retrospective clinical and histologic study of 30 non-Hodgkin's lymphomas diagnosed at the Department of Hemato-oncology of the Chosun University from January 1989 to December 1993 is presented. Among total 30 cases whose sexes were mentioned, male were 18 and female were 12 and the ratio is 1.5:1. The peak incidence of non-Hodgkin's lymphoma was found in the third decade. The case distributions by Working formulation were summarized in table 3. The most common histopathologic type of non-Hodgkin's lymphoma was the diffuse large cell type of intermediate grade. The presenting symptoms at the time of first visit to the hospital were summarized in table 4. The most common symptoms were palpable mass. Lymph node enlargements were found in 87 %, and most frequently on cervical area(35%). The incidence of primary nodal lymphoma is more frequent than extranodal lymphoma, 1.2:1. The most common primary site of extranodal lymphoma is the gastrointestinal tract. In the laboratory findings, the data of hemoglobin and hematocrit were summarized in table 8, 9, Values of hemoglobin and hematocrit of female patients greater than those of male patients. The results of the immunophenotypings of nodal and extranodal lymphoma indicates that the B-cell lymphoma are predominant(B:T=1.4:1). The clinical stage was Ⅱ in 9 cases(30%) Ⅲ in 9 cases(30%), Ⅳ in 8 cases(26.7%), Ⅰin 4 cases(13.3%), 28 cases were treated with CHOP regimen. Among them, 17 cases(60.8%) achieved a complete remission. 5 cases had a partial response. The most frequent toxicities were toxic hepatitis.

첫 삽화 정신분열병의 전구증상과 치료 전 경로 : 한국과 중국 연변간의 횡 문화 예비연구 Preliminary transcultural Study between Korea and China

정영철,박태원,유일한,현길용 대한정신분열병학회 2003 정신분열병 클리닉 Vol.6 No.2

慶南地域 中小企業 體質改善에 關한 硏究

金學壽,金容萬,尹泰烈,許南秀,元裕東 慶南大學校 産業經營硏究所 1988 産業經營 Vol.11 No.-

산국 (Chrysanthemum boreale) 휘발성 추출액 및 EDTA가 미생물 및 인체 치은 섬유아세포에 미치는 영향

차정단,김태영,우원홍,전병훈,김해경,유용욱,김강주,길봉섭 원광대학교 생체재료·매식연구소 2000 원광생체재료·매식 Vol.9 No.1

Chrysanthemum boreale (C. boreale) has been used for the treatment of furuncles, carbuncles, sores, conjunctivitis, headache, vertigo and swollen throats as a folk medicine in Korea, but there is little report about experiment evidence of antimicrobial activity. To investigate the antifungal and antibacterial activity of Chrysanthemum boreale(C. boreale) volatile substance and EDTA, the growth inhibition against Aspergillus nidulans (A. nidulans), Fusarium oxysporum (F. oxysporum), Alternaria mali(Al. mali), Candida albicans (C. albicans), staphylococcus aureus (S. aureus), Streptococcus pyogenes(S. pyogenes), streptococcus mutans (S. mutans), Escherichia coli(E. coli), Helicobacter pylori (H. pylori) and Porphyromonas gingivalis (P. gingivalis) was monitored by agar dilution and broth microdilution method. The antifungal effect of C. boreale on A. nidulans, F. oxysporum, Al. mali and C. albicans was shown at the concentration of 0.04%. The antibaterial effect of C. boreale on S. aureus, S. pyogenes, S. mutans and H. pylori was shown at the concentration of 0.04%. However, the growth was inhibited at the concentration of 0.04% irrespective of the presence of EDTA 0.125% was much higher than higher than that of several concentration of volatile substance. The minimum inhibitory concentrations of volatile substance were 0.16% against S. aureus, 0.04% against S. pyogenes, 0.02% against S. mutans, 0.40% against E. coli, and 0.18% against C. albicans. The growth of human gingival fibroblasts was not affected by C. boreale volatile substances at the concentration of 0.04%. These results indicate that volatile substance from C. boreale may have biologically toxic activities to the microorganisms.

科學敎師敎育의 實態調査와 그 改善方案 : 物理敎師 敎育을 中心으로

朴泳喆,宋寅命,權寧駿,趙泰環,金英猷 공주대학교 사범대학 과학교육연구소 1986 과학교육연구 Vol.18 No.1

The presnt study is concerned with too purposes. One, immedi-ately, is to use the new physics (science) curriculum revision in the physics (science) teacher preparation institution. The other, ultimately, is to throw some suggestions in curriculum revision and the related agencies and persons. The problems set-up, in detail, are educational objectives, the contents of subject-matter, the methods of instruction, management of curriculum, teacners' problems and opinions to the future education of physics teacher. Not only to analyze the present curriculum but also to develop the new curriculum, three dimensions, theoretical background reflected recent advancement and current topics in science educa-tion, the present status of the secondary school curriculum, the literature survey, and the status quo of college and graduate school curricula preparing qualified science teacher of secondary school are considered in criteria of analysis. The results are the following. The educational objectives set-up are not clear-cur and not appropriate. The contents of subject are not so validated to objectives reflected current science curric-lum of secondary school and philosophy of science teacher educa-tion, and are not made into structure. The methods of assertion and proof and the creative thinking information processing, problem-solving, decision-making are encouraged in the present teaching. In conclusion, the new physics (science) teacher preparation curriculum model appropriate to our situation is presented. The new model emphasized the flexibility of the curriculum managem-ent and stressed the achievement of excellence in teaching of open-competence, the concept of science for all and multi-aspect of modern science and technology.