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황금(Scutellaria baicalensis)의 열수 추출물이 병원성 세균에 미치는 항균활성
김은님,백종윤,김용현,한만덕 순천향대학교 기초과학연구소 2008 순천향자연과학연구 논문집 Vol.14 No.1
This study was investigated antibacterial activity of aqueous fractions from ScuteItaria baicalensis against various pathogenic bacteria. Extracts were obtained from the roots of 5. baicatensis which has shown selective antibactehal effects on various strains of bacteria. The aqueous extract of S. baicatensis was tested on 19 species of human pathogenic bacteria. The bacteria were cultured in nutrient broth, and YM broth then incubated aerobically at 37℃ for 18-24 hours. Antimicrobial activities tested by paper disc and radial diffusion assay methods. The aqueous extracts of 5. baicatensis inhibited the growth of most human pathogenic bacterial and showed 62.5㎎/㎖ of MIC values against StaphyIococcus aureus SG511 and 125㎎ /㎖ of MIC values against Staphytococcus aureus 285 and Staphylococcus aureus 503. These results suggest that S. baicaIensis extract can be used as an effective natural antibiotics.
DC방전에 대한 전류 및 전압 조건에서 1차원 전산모사
김희정,김형용,권득철,윤남식 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.1
여러 그룹들의 연구 결과로서 DC 방전 전산모사를 위한 여러 가지 수치해석적 방법들이 보고되어 왔다. 대부분의 방법들은 전극에 전압을 경계 조건으로 가정하고 전류를 구하는 방법인데, 때로는 전류값을 조건으로 주고 전극의 전압이 결정되는 방법이 필요한 경우도 있다. 본 연구에서는 전류값이 조건으로 주어진 경우에 전극의 전압이 결정되는 방법을 적용했으며, 1차원 전산모사를 통해 두 가지 방법에 의한 결과를 비교하였다. Various numerical simulation algorithms for simulating DC discharge were reported from many research groups. Most of reported methods uses terminal electrode voltage as a boundary condition to obtain current density. However, in some case, we need to obtain terminal voltage from boundary condition of current. In this paper, the method which obtain voltage under current condition is applied, and we compared the results of two methods through one-dimensional simulations.
中等學校 敎師가 參與하는 非公式組織의 類型, 動機 및 機能 分析
金容周,裵容得 경상대학교 중등교육연구소 1994 현대교육연구 Vol.6 No.-
The purpose of this study was to analyze the types. motives, and functions of teacher’s informal organizations in secondary schools. For the purpose of this study. the reseachers examined the characteristics of school organization and the concepts. formation factors, Types, and functions of the informal organization through reviewing previous studies and relative literatures. For this study, 500 questionnaires were distributed to teachers of 20 secondary schoools in Gyeong Nam Province, and 451 of them were used for the analyses of data. The questionnaire used in this study was developed by the reaearchers. It was composed of 25 questions on the types, Motives, and functions of teacher’s informal organizations. Conclusions of this study were as follows. First, the types of informal organization in which secondary school teachers participated were mainly for satisfying individual needs and having membership. This fact revealed that teachers’ informal organizations in schools are organized by the same reasons as the general formation factors of informal organization in other social organizations. Second, the main motives of participation in informal organization were for maintaining good human relationships, satisfying individual needs, enjoying hobbies, relaxing personal tensions and stresses, and enlarging mental capacity. This fact can be explained that teachers in secondary schools recognized the informal organization as a dicice to satisfy their psychological needs, to improve communications among colleagues, and to form the coorporative organizational atmosphere. Third, teachers recognized the function of informal organization positively. That is, they agreed in general that informal organizations have following functions: improving the teachers’ task performance; encouraging human relationships among colleagues; understanding of actual school situations: and decreasing organizational rigidity. Finally, on the basis of the above conclusions, three points can be suggested to school administrators for the efficent school management: the administrators should 1) recognize that teachers’ participation in informal organization is a universalized phenomenon; 2) pay continuous attentions to teachers’ informal organizations; and 3) attempt to take necessary measures that the informal organization would be a complementary subgroup in a school organization which alleviates negative aspects of formal organization, such as organizational stiffness and lack of personal interactions.
신축 공동주택의 VOCs와 알데히드류 성분에 대한 실태조사
임득용,김지현,황인조,김동술 경희대학교 2004 環境硏究 論文集 Vol.13 No.-
In comparison with other studies, in particular, the emission of indoor HCHO in new apartments were very serious and Vacs showed below the Japan's guidelines (260 ㎍/㎥) excepting toluene (324.31 ㎍/㎥). Concentration of volatile organic compounds (VOCs) including aldehydes in indoor air was analyzed at 3 new apartments (at the lower, middle and upper floors of each apartment) during the Spring in 2004. The sample gases of Vacs and aldehydes were collected by Silicon canister (6 L) and 2,4-DNPH cartridges, and the analysis was made by the GC/MSD and PLC. As a result of the analysis, formaldehyde (HCHO) amongst aldehydes was found the highest (874.63 ppb) at the upper floor of C Apt., and the aldehydes' concentrations were S > C > K Apt. each. Also it did not show an apparent variation of characteristics according to floor. The concentration of VOCs was the highest (819.22 ppb) at the upper floor of C Apt. which exhibited in proportion with height.
재사용 가능한 소프트웨어 컴포넌트 시스템의 설계에 관한 연구
이종득,김용성 全北大學校 1990 論文集 Vol.32 No.-
Development environments which effectively promote reuse of Software Components are dominant concern of Software Engineering. In this paper, we propose classification methods of Software Components in order to improve Software quality and productivity, and so present reusable Software Components system model to evaluate Components system.
함승시,김미남,정용진,이득식 동아시아식생활학회 2001 동아시아식생활학회지 Vol.11 No.1
This study was performed to examine the antimutagenic and cytotoxic effects of potato vinegar and commercial vinegars(cider, brown rice, persimmon vinegars) on Salmonella typhimurium TA98. TA100 and cancer cell lines using Ames test and cytotoxicity assay, respectively. In Ames test, all vinegars did not exhibit any mutagenicity, but showed substantial inhibitory effects against N-methyl-N-nitro-N-nitrosog-uanidine(MNNG), 4-nitroquinoline-1-oxide(4NQO), 3-amino-1.4-dimethyl-5H-pyrido[4,3-b] indol(Trp-P-1) and benzo(a)pyrene(B(a)P). The number of revertants per plate decreased significantly when these vinegars(80㎍/plate) were added to the assay system using TA100 strain. Especially, potato vinegar(80㎍/plate) showed high inhibition rate of 69.9% against mutagenicity of B(a)P on TA100 strain. In the cytotoxicity assay, these vinegars also showed prominent cytotoxic activity against human cancer cell lines. Potato vinegar(10㎍/showed the strongest cytotoxic effect against HT1080 (fibrosacoma cell) and K562 (myelogenous leukemia) at the same concentration when compared with other vinegars.