발전기 고정자 권선용 마이카/에폭시 수지의 표면 및 구조분석

이상교,심재선,정의남,송우창,박하용,심상흥,임윤희,박종국,심낙순 三陟大學校 1998 論文集 Vol.31 No.1

The purpose of this study is to determine the ageing mechanism of Mica/Epoxy composite material for large generator stator windings in order to estimate remaining life of generator. X-ray analysis is performed to investigate the position and structure of mica crystal in insulation materials. The phase change of aged and sound specimen under each atmosphere isn't observed. Surface analysis of insulation materials by optical microscope also show that the sound and aged specimen, sliding phenomenon by shear and thermal stress is observed both interface between mica and epoxy.

고양이 위 평활근에서 KCI에 의한 근수축에 대한 Protein Kinase의 조절

심상수,김승록,심혜선,이덕주,한상준,윤신희,조양혁,김명석 大韓消化器病學會 1998 大韓消化器病學會誌 Vol.32 No.3

고양이 위 평활근 수축에 대한 Vanadate와 Pervanadate의 효과

심상수,최효봉,심혜선,이덕주,윤신희,한상준,김명석,조양혁 大韓消化器病學會 1999 大韓消化器病學會誌 Vol.33 No.1

건설현장 근로자들의 안저예방실태와 사고예방과의 개선요인 조사연구

심규범,남철현,최상복,이송권,이정희,이순자,문기내,김문환 慶山大學校 保健福祉硏究所 2003 保健福祉硏究 Vol.8 No.-

This study was conducted to examine aspects of health and safety education and demand level of safety education in construction job sites in order to provide direction of safety education development. The subjects of this study were 566 workers who were working in construction job sites located in Daegu City and Kyungbuk Province. Data were collected from June 1, 2002 to August 30, 2002. The results of this study can be summarized as follows. 1. According to safety education by experience methods, the proportion of education by lecture was highest (90.6%). The proportion of education by field practice was 13.1%. 2. Among the education methods which they thought as the most desirable method, the proportion of audio-visual education was 39.4% and the proportion of education by experience was 37.5%. Those who had more monthly income and higher education level preferred audio-visual education, while those who were younger and less educated preferred education by experience. 3. In the case of the contents of the safety education which they thought as the most important one, the proportion of enhancement of safety awareness and education of risk factors was highest (24.7%). The groups of older workers, having longer working period, and belonging to higher education level preferred these contents. 4. According to the factors which were most important to increase effectiveness of the safety education were workers' voluntary participation (27.7%), 40 to 49 years old (27.7%), and monthly income of one million, five hundred thousand won to one million, nine hundred ninety thousand won (32.0%). The proportions of lower educated workers and working as daily workers were also high. 5. The variable which most influenced the safety education was age. The safety awareness of construction job sites was the second highest influential variable. From above results, it is clear that the workers' participation in the safety education was low since most of the safety educations were formal education by lecture. Although they participated in the education, the education was also not effective because they compulsorily participated in it. Therefore, it can be concluded that effective alternative policies must be formulated.

紅景天(Rhodiola sachlinensis)에서 항균성 물질의 분리 및 동정

심창주,이규희,정재홍,이상덕,김영호,오만진 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2004 한국식품저장유통학회지 Vol.11 No.1

홍경천의 천연 보존료로서의이용성을 검토하기 위하여 각종 용매로 홍경천 추출물을 제조하고 극성에 따라 순차분획, silica-gel chromatography, thin-layer chromatography, high perfomance liquid chromatography의 분리과정을 거쳐 순수 분리된 각 물질을 GC/MS(EI) spectrum, ¹H-NMR spectrum, ¹³C-NMR spectrum을 이용하여 항균물질을 동정하여 다음과 같은 결과를 얻었다. 홍경천에 대해 acetone, ethyl acetate, ethanol, methanol, chloroform, water의 각 용매로 추출한 결과 항균성분의 추출 용매로는 methanol이 가장 우수하였다. 홍경천 methanol 추출물을 n-hexane, chloroform, ethyl ether, ethyl acetate, n-butyl alcohol로 분획한 결과 ethyl acetate와 n-butyl alcohol 분획에서 우수한 항균력을 나타내었다. 홍경천 methanol 추출물은 그람양성 4균주와 그람음성 4균주에 대해 고체 배지의 경우 대체로 500 μg/mL에서 최소저해를 나타냈으며, 액체배지의 경우 100 μg/mL 내외에서 최소저해를 나타내었다.] Silica gel column chromatography에서 용매의 배율을 높여가며 용출한 결과 chloroform : methanol(8:2, v/v)의 비율에서 항균력이 가장 높게 나타났다. 분리된 항균성분을 silica-gel TLC plate에 용매의 비율을 높여가며 전개시켜 chloroform : methanol(9:1, v/v)에서 9개의 물질군을 얻을 수 있었으며, 그 중 항균력이 확인된 3개의 물질군을 HPLC와 NMR spectrum을 분석한 결과 gallic acid, (-)-epicatechin 및 kaempferol로 동정되었다. gallic acid, (-)-epicatechin 및 kaempferol의 항균물질 각각의 최소저해농도는 Staphylococcus aureus와 Listeria monocytogenes에 대해 gallic acid와 kaempferol 이 500 μg/mL, (-)-epicatechin이 100 μg/mL에서 저해를 나타내었다. The antimicrobial substances from Rhodiola sachalinensis were extracted, isolated and identified. The highest level of antimicrobial activity and its yield were obtained in methanol extract. The minimum inhibition concentrations of the methanol extract were 500 μg/mL on agar plate and 100 μg/mL in broth media for four gram positive and four gram negative microbials. The methanol extract was fractionated by n-hexane, chloroform, ethyl ether, ethyl acetate, and butanol, orderly. The separate was developed on the TLC plate with different solvent system ratio of chloroform and methanol. Nine substances were isolated from chloroform and methanol mixture(9:1, v/v). Among them, three isolates showed antimicrobial activity. Three substances separated by HPLC were identified by GC/MS(EI) spectrum and ^(1)H, ^(13)C-NMR spcetrum. They were gallic acid, (-)-epicatechin and kaempferol. The antimicrobial activites of each substances were shown gallic acid, (-)-epicatechin, kaempferol, orderly.

플라스마 융합연료 공급시스템 개발

심명화,정홍석,김창석,백승우,안도희,이민수,김광락,임성팔 한국공업화학회 2005 응용화학 Vol.9 No.1

The main purpose of fusion fuel supply system is to store and supply hydrogen isotopes needed for operation of ITER and to provide the necessary infrastructure for short and long term storage of large amount of hydrogen isotopes. The storage of tritium as metal tritide on hydride forming metals or intermetallic compounds is recognized as the most reliable and safe method. Considering the advantages and disadvantages of several hydrogen isotope getter materials, the authors suggest the use of ZrCo on the basis of its ideal P-T-C characteristics and its non pyrophoricity. The authors also suggest the hydrogen isotope storage beds design appropriate to the fusion fuel supply system.

韓國 輸出企業의 인터넷을 이용한 사이버貿易 具現 및 成果에 관한 연구

심상렬,문희철 한국통상정보학회 2000 통상정보연구 Vol.2 No.2

인터넷의 급속한 보급 및 확산은 국제무역에 있어 일대 혁신을 초래하고 있으며, 특히 해외시장조사, 해외홍보 및 마케팅, 거래선 발굴, 신용조사, 거래협상 등 계약 체결 이전까지의 거대경로에 있어 시간과 공간의 제약이 없이 저렴하고 신속하게 글로벌 비즈니스를 수행할 수 있게 하고 있다. 본 연구에서는 한국 수출기업들이 어떠한 업무에 어느 정도나 인터넷을 활용하고 있는지, 실제로 어떠한 활용성과를 거두고 있는지 등을 설문조사에 의한 실증분석을 살펴 봄으로써 국내 수출기업들의 인터넷을 활용한 전자상거래, 즉 사이버무역 내지 전자무역의 활성화 및 국제경쟁력 제고 방안을 모색하고 있다.

Clinical Significance of Tissue Levels of Matrix Metalloproteinases and Tissue Inhibitors of Metalloproteinases in Gastric Cancer

심기남,정성애,주양희,유권 이화여자대학교 의과대학 2005 EMJ (Ewha medical journal) Vol.28 No.2

목적: 본 연구는 암의 침윤과 전이에 필수적인 기질단백분해효소(matrix metalloproteinases, MMPs)와 억제인자(tissue inhibitor of metalloproteinase, TIMPs)의 발현정도를 위암의 생검조직에서 확인하고 임상적, 병리학적 소견과의 상관관계를 분석하여 임상적 유용성을 평가하고자 하였다. 방법: 2003년 8월부터 2004년 7월까지 본원에서 위암으로 진단되어 근치적 치료를 받은 30명의 환자를 대상으로 하였다. 조직은 위내시경 검사시 정상 점막 및 암으로 진단한 병변에서 생검겸자를 이용하여 얻었다. 역전사중합효소연쇄반응(RT-PCR)을 이용하여, 정상조직을 기준으로 암조직에서의 MMP-W, MMP-9, MT1-MMP, TIMP-1, TIMP-2의 발현정도를 반정량법으로 비교하였다. 결과: MT1-MMP의 발현정도는 위암의 분화도, 림프혈관계 침윤, 림프절 전이 및 암의 병기와 유의한 상관관계가 있었다.(p<0.05). 그 외의 MMP-2, MMP-9, TIMP-1,TIMP-2의 발현은 임상적 소견과 유의한 관계를 보이지않았다. 결론: 반정량적 역전사중합효소연쇄반응을 이용하여 MT1-MMP의 발현 증가 유무를 확인하는 것은 위암의 공격적 특성을 예측하는데 유용할 것으로 생각되며, 이러한 검사는 수술 전에 얻어진 생검조직을 이용하여 가능하므로 암의 공격성에대한 정보를 수술 전에제공할 수 있을 것으로 사료된다.

HPLC를 이용한 농약코빈(thiophanate-methyl)의 측정법에 대한 연구

沈凞祥,金昌世 순천향대학교 1990 논문집 Vol.13 No.1

The best conditions were described for the measurements of kobin, which was a group of carbamate pesticide, by HPLC. The following results were obtained. 1. The eluates were detected with Dupont model 850 UV detector at 254nm. 2. Analyses were performed using Dupont model 8800, Bondapak C18 ODS column, linear gradient was increased from 10% to 100% with methanol-0.04% acetic acid at a flow rate of 1.5㎖/ min., 35℃ and a chart speed of 0.5㎖/min. 3. The relationships between the concentration and absorbance of pesticide kobin were linear 10 to 100ppm. 4. Deproteinization could be used satisfactorily in all of Folin-Wu, trichloroacetic acid and perchloric acid, and the recovery rate was found to 100% for perchloric acid and Folin-Wu except TCA.

저탁도시 PAC와 Ca-PAX의 입자제거 및 슬러지 탈수성 비교

심유섭,유명진,조희경,이상수,곽종운 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4

This study was accomplished to evaluate the characteristics of particle removal and sludge dewatering and to find out the optimal condition of coagulation depending on the dosage of different coagulants (PAC, Ca-PAX) in low turbidity water. The experiments were carried out at a pilot plant of conventional rapid sand filtration system using artificial raw water. There was no large difference in the removal efficiencies of turbidity and total particle counts for both coagulants. However, Ca-PAX was required less than PAC to obtain the same efficiency of removal, and the initial head loss in a filter increased more fastly in case of PAC. The results on the evaluation of sludge from settling tank indicated that specific resistance of sludge was decreased inversely to the dose of both coagulant and specific resistance of Ca-PAX sludge was lower than that of PAC, therefore dewatering of sludge in case of Ca-PAX was better.