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공동주택 중량바닥충격음의 차단성능 실태분석에 관한 연구
신훈,국찬 대한건축학회지회연합회 2010 대한건축학회연합논문집 Vol.12 No.3
본 연구에서는 현장에서 측정한 중량바닥충격음 결과를 바탕으로 현재의 바닥충격음 차단성능 현황을 분석하였다. 슬래브 두께 180mm 바닥구조 29개, 슬래브 두께 210mm 바닥구조 34개의 현장 측정자료 63개를 이용하여 현행 중량바닥충격음의 평가방법을 검토한 결과는 다음과 같다. 1) 중량충격음 차단성능에 대한 주파수 특성에 있어서 슬래브 두께 210mm의 바닥구조는 슬래브 두께 180mm의 바닥구조 보다 125Hz 이상의 중음역에서 보다 급격히 감쇠하는 특성을 나타냈다. 2) 대상구조별 단일수치평가량 현황분석 결과 슬래브 두께 180mm의 경우 최소 기준치 50dB를 만족하는 비율이 약 27.5%에 불과하였고, 슬래브 두께 210mm의 경우에는 약 65%를 만족하는 것으로 나타났다. 3) 역 A특성 단일수치 평가량의 결정주파수 대역의 기여정도는 63Hz이 가장 크게 나타났으며, 특히 슬래브 두께 210mm에서는 63Hz의 기여비율이 상대적으로 커지는 경향을 보였다.
신훈,정인근,Sin, Hun,Jeong, In-Geun 한국경영정보학회 1991 Asia Pacific Journal of Information Systems Vol.1 No.1
This paper presents a developmental approach undertaken by Asiana Airlines to implement computerized reservation system (CRS), Asiana Airlines is a new entrant into the once monopolized airline business in Korea. As a new entrant, it was absolutely necessary to develop CRS fast to begin the business in a relatively short period of time. By taking the risk of choosing Airline Control System which no airlines has yet implemented CRS with, Asiana Airlines was able to shorten development time considerably as well as integrate CRS with internal management information systems. This enhances system flexibility greatly. It is initially viewed that developing CRS is not to get competitive advantage but to overcome competitive disadvantage at Asiana Airlines. The paper also surveys the changing environment of CRS in general and the future implementation plan for ARTIS(Asiana Airline Reservation and Travel Information System) to be more of a competitive weapon in increasingly competitive international air travel market.
종양 표지 인자로서 혈장 Transforming Growth Factor-β1에 대한 연구
신훈,임창기,최인영,이두연,노동영,류민희,이효석,방영주,박종섭,진승원,Shin, Hoon,Lim, Chang Ki,Choi, In Young,Lee, Doo Yun,Noh, Dong Yong,Ryu, Min Hee,Lee, Hyo Suk,Bang, Yung Jue,Park, Jong Sup,Jin, Seung Won 대한면역학회 2001 Immune Network Vol.1 No.2
Background : Many investigators have found transforming growth factor-${\beta}1$ (TGF-${\beta}1$) to be elevated in tumors. Changes in responsiveness to TGF-${\beta}1$ have been linked to malignant transformation, tumor progression and tumor regression. Many malignant cell lines of epithelial or hematopoietic origin are refractory to the antiproliferative effects of TGF-${\beta}1$. However, a little is known about the association of TGF-${\beta}1$ with progression of malignant tumor. Methods : In this study, we measured the plasma level of TGF-${\beta}1$ in various cancer patients and evaluated the utility of plasma TGF-${\beta}1$ as a possible tumor marker. Plasma TGF-${\beta}1$ levels were measured using enzyme-linked immunosorbent assay in cancer patients and normal controls. Carcinoembryonic antigen (CEA) and alpha-fetoprotein (AFP) as tumor marker were compared with TGF-${\beta}1$ in the aspects of sensitivity and specificity. Results : The mean of plasma TGF-${\beta}1$ levels was $1.219{\pm}0.834ng/ml$ in normal controls, $5.491{\pm}3.598ng/ml$ in breast cancer, $12.670{\pm}10.386ng/ml$ in lung cancer, $5.747{\pm}3.228ng/ml$ in hepatocellular carcinoma and $10.854{\pm}7.996ng/ml$ in cervical cancer. In comparison with CEA and AFP, TGF-${\beta}1$ is more sensitive. Conclusion : We conclude that the high levels of TGF-${\beta}1$ are common in the plasma of cancer patients. These results suggest that the plasma TGF-${\beta}1$ level can be a potent tumor marker in various cancer patients.