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工業界 高等學校 金屬加工(Ⅰ)의 實習指導 指針書 開發에 관한 硏究
權赫茂,林榮彦,申世均 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1
The purpose of metal working(1) laboratories of a technical high school curriculum is to prepare the student efficient work performance in the field of foundry engineering. In order to achieve this purpose, a teaching guide book should be written by the teacher in actual charge of the course under consideration, needs of local industry, practice -equipment of schools and students pre-condition. In this study, the process of development of metal working (1) laboratory is investigated and a teaching guide book for melting operation of cast iron was developed. When a teaching guide book is developed, the following items are necessary to be taken into account: 1) Setting up practice-plan, job analysis of the section should be done and the operations plan to be developed step by step. 2) Student arrangement for each job should be planned. 3) The teacher should provides the subject-library with work-standard and require prelimihome work about each job. 4) The teacher should prepare audio-visual aid to as to understand the relationship between theory and practice. 5) A teaching guide book includes ⅰ) preliminary home-work relative to each operation, ⅱ) the point of observation and recording form, ⅲ) the point of discussion after practice, ⅳ) the evaluation standard.
Enhanced vertical diffusion coefficient at upper layer of suspended sediment concentration profile
Kim, Hyoseob,Jang, Changhwan,Lhm, Namjae Techno-Press 2012 Ocean systems engineering Vol.2 No.4
Assume fluid eddy viscosity in the vertical direction is parabolic. Sediment particles diffuse with the given fluid eddy viscosity. However, when the vertical diffusion coefficient profile is computed from the suspended sediment concentration profile, the coefficient shows lager values than the fluid mixing coefficient values. This trend was explained by using two sizes of sediment particles. When fine sediment particles like wash load are added in water column the sediment mixing coefficient looks much larger than the fluid mixing coefficient.
Lim, Jong Tae,Park, Jin Woo,Kwon, Jae Wook,Yeom, Geun Young,Lhm, Kyuwook,Lee, kyoung Jae The Electrochemical Society 2013 Journal of the Electrochemical Society Vol.160 No.1
<P>A rubidium carbonate (Rb<SUB>2</SUB>CO<SUB>3</SUB>)-mixed fullerene (C<SUB>60</SUB>) layer was used as the electron ohmic-contact layer and the effect of Rb<SUB>2</SUB>CO<SUB>3</SUB> mixing concentration on the optoelectronic properties of organic light-emitting diodes (OLEDs) was investigated. The performance of an electron-only device, with a glass/ITO/Rb<SUB>2</SUB>CO<SUB>3</SUB>-mixed C<SUB>60</SUB> (10 nm)/Al structure, was strongly dependent on both the thickness and the mixing concentration of the Rb<SUB>2</SUB>CO<SUB>3</SUB> layer in the Rb<SUB>2</SUB>CO<SUB>3</SUB>-mixed C<SUB>60</SUB> thin films. The ultraviolet photoemission spectra of the Rb<SUB>2</SUB>CO<SUB>3</SUB>-mixed fullerene (C<SUB>60</SUB>) layer showed the formation of new Fermi level crossing states, below the Fermi level caused by a chemical interaction between Rb species and C<SUB>60</SUB>, and which led the n-mixing effect to the contact. The emergence of new FLCSs contributed to the formation of an electron ohmic-contact between the cathode and the organic layer by increasing the number of electron carriers. The OLED device with Rb<SUB>2</SUB>CO<SUB>3</SUB>-mixed C<SUB>60</SUB> as an electron ohmic contact layer, and composed of a glass/ITO/MoO<SUB>3</SUB>-mixed NPB (25%, 5 nm)/NPB (63 nm)/Alq<SUB>3</SUB> (39 nm)/Rb<SUB>2</SUB>CO<SUB>3</SUB>-mixed C<SUB>60</SUB> (75%, 3 nm)/Al (150 nm) structure, showed better optoelectronic properties than the OLED fabricated with C<SUB>60</SUB> (5 nm)/LiF (1 nm) as the electron ohmic-contact layer.</P>
Microbial degradation of th persistent pollutnat TCAB
Lee, Jae Koo,Kyung, Kee Sung,Oh, Kyeong Seok,lhm, Yang Bin,Cho, Yong Gyun,Kim, Nam 한국농화학회 1990 Applied Biological Chemistry (Appl Biol Chem) Vol.33 No.4
In order to investigate the possibility of the microbial degradation of the persistent pollutant TCAB(3, 3', 4, 4'-tetrachloroazobenzene) in our environment, four strains of microorganisms were isolated from industrial wastes by the enrichment technique. They were identified as Achromobacter group VD, Pseudomonas testosteroni/alcaligenes, Maraxella spp., and Alcaligenes faecalis, respectively. These microorganisms utilized TCAB as a sole carbon source in the MM₂ salt medium. When ^(14)C-TCAB was added to the medium as a sole carbon source and incubated, some radioactive metabolites were detected by autoradiography. No ^(14)CO₂ was evolved from ^(14)C-TCAB which was added as a sole carbon source to an organic matter-free soil inoculated by one of the isolates(Achromobacter group VD), wetted with the MM₂ medium, and incubated at 30℃. One of the metabolites in pure culture of these microorganisms was tentatively identified as a compound of m/z 250 by means of GC/MS. The possible pathways for its formation are thought to include dechlorination from TCAB structure, hydroxylation, ortho fission of the two benzene rings, and reduction of the resulting carboxyl group.
김남철,김상훈,임홍규,김정호,정형식,박종철,김영심,Kim, Nam Cheol,Kim, Sang Hoon,Lhm, Hong Kyu,Kim, Jung Ho,Jung, Hyung Shik,Park, Jong Chul,Kim, Young Shim 한국정신신체의학회 2015 정신신체의학 Vol.23 No.1
Objectives:The aim of this study is to investigate any differences between non-medical and medical college students for : 1) a level and the nature of perceived stress, 2) a level of life satisfaction, and 3) the related factors affecting to life satisfaction. Methods:We measured self-reported questionnaires of stress, satisfaction with life, health behavior including happiness, alcohol use, nicotine dependency and depressive symptoms in 1,714(863 non-medical and 851 medical) college students. Results:Non-medical college students had significantly higher total stress scores than medical college students(${\chi}^2$=7.66, p<.001). In non-medical college students, employment problem score was significantly higher than medical college students(t=4.07, p<.001). In medical college students, the scores of academic achievement (t=-3.81, p<.001), change of social life(t=-2.03, p<.05), death(t=-2.05, p<.05) or sickness(t=-2.60, p<.05) of friends were significantly higher than non-medical college students. And non-medical college students showed significantly lower life satisfaction scores than medical college students(${\chi}^2$=-19.05, p<.001). We also found that life satisfaction were significantly related to happiness in non-medical college students(${\beta}$=.410, $R^2$=.325, p<.001) and depressive symptoms in medical college students(${\beta}$=-.435, $R^2$=.326, p<.001) by stepwise multiple regression analysis. Conclusions:In this study, a level and the nature of perceived stress, a level of life satisfaction, and the related factors affecting to life satisfaction showed definitely differences between non-medical and medical college students. We suggest with our findings that specified mental health promotion program need for the college student's mental health management. 연구목적 일반대학생과 의과대학생이 경험하는 스트레스 정도와 유형, 삶의 만족도, 삶의 만족도에 영향을 미치는 관련요인 등을 비교해보고자 하였다. 방 법 2013년 11월과 2014년 3월부터 4월까지 광주광역시, 전라남도, 전라북도 소재 4개 대학교의 일반대학생 863명, 의과대학생 851명, 총 1,714명을 대상으로 일반적 정보와 스트레스, 삶의 만족도, 행복도, 음주, 니코틴 의존, 우울증상 등을 포함하는 건강 관련 요인들에 대해 자기보고 질문지를 이용하여 현장 조사하였다. 결 과 첫째, 일반대학생은 의과대학생보다 스트레스 총점이 유의하게 높았다. 일반대학생은 의과대학생에 비해 취업문제에서, 의과대학생은 일반대학생에 비해 학업성취도, 사교 활동의 변화, 친구의 죽음이나 질병에서 유의하게 스트레스를 많이 경험하고 있었다. 둘째, 일반대학생은 의과대학생에 비하여 삶의 만족도가 유의하게 낮았다. 셋째, 삶의 만족도에 영향을 미치는 요인 분석에서 일반대학생은 행복도가, 의과대학생은 우울증상이 가장 설명력이 높은 변인이었다. 결 론 본 연구에서, 일반대학생과 의과대학생이 경험하는 스트레스의 수준과 유형, 삶의 만족도 정도 그리고 삶의 만족도에 미치는 관련요인 등에서 차이가 있음을 확인하였다. 이와 같은 결과는 대학생들에게 스트레스를 해소하고 정신건강과 삶의 만족도를 향상 시킬 수 있는 정신건강 증진 프로그램이 필요함을 시사하고 있다.