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한억수,이상규,구희조 한국정보전략학회 1999 추계공동학술대회 논문집 Vol.- No.01
This study firstly aims to review the discussions among major nations and international organizations on removal of tariff wall in EC. Secondly, it is analyzed how the trend of tariff reduction of removal will affect an individual economy in a partial balance analysis model on an assumed small-size economy. In closing, political implication for removal of tariffs in EC will be presented. The study concluded that tariff removal on Internet EC has both positive and negative effects on the importing economy. It can improve the efficiency in utilization of economic resources by the importing economy in the long term while cut the financial revenue and aggravate the trade balance of importing country. It is inferred from such a conclusion that tariff removal can lead to trade imbalance between the Information haves and the have-nots.
사람 갑상선자극호르몬 수용체를 발현하는 Chinese Hamster Ovary(hTSHR-CHO)세포를 이용한 자극형 갑상선자극호르몬 수용체 항체 활성 측정의 임상적 유용성
한희정,원진호,채수홍,김현진,송민호,김영건,노흥규 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.1
Detection of thyroid stimulating hormone receptor(TSHR) autoantibodies has clinical value in establishing the diagnosis of Graves ' disease, and in predicting its clinical course with high sensitivity and high specificity. Especially, TBII using radioreceptor assay has been widely used. Recently, for detecting thyroid stimulating antibody(TSAb), a sensitive method using human TSH receptor-transfected Chinese Hamster Ovary(CHO) cells has been developed and clinically used. The aims of this study are to determine the change and discrepancy of 2 TSHR autoantibodics in clinical course and to evaluate the correlation between 2 autoantibodies. We measured TSAb and TBII in 30 newly diagnosed and untreated patients and in 73 previously diagnosed as Graves ' disease and treated with antithyroid drug. Also we compared the changes of the antibodies in clinical course and correlation between 2 antibodies. Thes results are summarized follows. 1. In newly diagnosed patients, all of the 30 patients had positive TBII and/or TSAb. None of them had negative TBII and negative TSAb. And in newly diagnosed patients, mean TBII and mean TSAb values are 46.8% and 361%, respectively. In 73 treated patients mean values are 18. 7% and 196% each other. Therefore, newly diagnosed group has significant greater TBII and TSAb than antithyroid drug-treated group. 2. TBII was significantly different between euthyroid group and thyrotoxic group in antithyroid drug-treated patients, but TSAb was not. 3. TBII was sequentially decreased as increased medication duration, but TSAb was not shown sequential decrease as increased medication duration. 4. There was significant negative correlation between cumulative doses of antithyroid drug and TBII, but no significant correlation between cumulative doses and TSAb. 6. There was significant positive correlation between TBII and TSAb in total patients group and in antithyroid drug medication group, but not in newly diagnosed group. In conclusion, in Graves ' disease patients, detection of TSHR antibodies are clinical values in establishing the diagnosis and prediction of clinical course. A method detecting TSAb using hTSHR-CHO cells should be further studied for standardization of measurement, and for detecting the changes of TSAb in clinical course, long-term follow-up of patients are important.
플라즈마를 이용한 유리섬유강화 복합절연재료의 표면처리에 관한 연구
이규철,남창우,김희대,황영한,김경석 울산대학교 1997 공학연구논문집 Vol.28 No.1
본 연구에서는 에폭시계 복합 절연재료 Glass-cloth/Epoxy 의 계면 접착특성을 향상시키기 위하여 표면처리 조건에 따라 각각 복합 절연재료를 제작하였고, 전기·기계적특성의 상관관계를 다음과 같은 실험을 행하여 비교하였다. Glass의 젖음의 정도를 평가하기 위하여 표면처리 조건에 따라 주위온도 80[℃]에서 접촉각을 측정하였고, 주위온도 및 인가전압을 변화시키면서 비유전율(εr), 유전정접(tanδ) 및 전기적 절연강도를 측정하였다. 기계적 특성을 측정한 후에 파단면의 형상을 SEM으로 분석, 검토하였다. 실험 결과, (1) 주위온도가 상승함에 따라 비유전율 및 유전정접은 증가하였고, 전기적 절연강도는 감소하였으며 플라즈마 처리함으로서 전기·기계적특성은 전반적으로 향상되었다. (2) 접촉각 측정 주위온도가 80[℃]일 때, 표면처리 조건에 따른 젖음성은 각각 다르게 나타났고 플라즈마 처리효과는 표면세정, 미세요철, 표면대전 및 젖음성의 감소와 같은 복합효과로 볼 수 있다. (4) 전기·기계적특성의 관점에서 복합 절연재료의 경화온도가 80[℃]일 때, Glass-cloth/Epoxy복합 절연재료의 최적처리시간은 3분 정도로 나타났다. The Glass-cloth/Epoxy composite insulating materials for this study have been prepared with several different surface treatmenttechniquen such as untreatment ultrasonic treatment and plasma treatment, and their electrical and mechanical characteristics have been compared each other. It has been found that plasma-treated glass has the smallest contact angle with a drop of epoxy. The plasma-treated composite materials have superior dielectric strength and mechanical tensile-strength compared to the materials subjected to other surface treatments. Also, the experiment showed that there exists an optimum plasma treatment duration for improving the interfacial characteristics of the composite insulating materials. The optimum plasma treatment durations are about 3 minutes for Glass-cloth/Epoxy at 80[℃]. Longer plasma treatment has been appeared to degrade the interfacial characteristics.
백서의 원위부 피편에 동맥유입의 중요성에 관한 실험적 연구
최규남,최희윤,강희문,김한중 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.2
Microsurgery and myocutaneous flap have been developed recently for wide employment in plastic and reconstructive surgery. Therefore, the delay procedure has been declined in its use recently, because it has many difficult problems. If the flap is longer and larger, it should be delayed for complete survival, but delay requires considerable time. Therefore, as a substitute for delay, vascular anastomosis in the distal part of a flap will theoretically give the same effect. In this study, we investigated the importance of arterial inflow in the distal side of a flap in rats. The experiment was done in 3 different groups according to the design of flaps and in each group 3 subgroups were made. In A flap, the superficial epigastric artery was preserved or anastomosis. In V flap. the superficial epigastric vein was preserved or anastomosis. In C flap, as a control flap, both artery and vein were severed. In result, A flaps in all 3 groups were completely survived. Both V and C flaps in all 3 groups were showed distal necrosis. But C flaps were showed more necrosis than V flaps. In conclusion, we suggest the possibility that a large flap may be transposed in one stage with vascular anastomosis in the distal part-preferably artery and vein, or artery only.