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Adriamycin 이 培養 鷄胚 筋細胞의 分化過程에 미치는 影響에 關한 硏究
劉泰煥,金在玟,崔玟圭,鄭然泰 圓光大學校 醫科學硏究所 1987 圓光醫科學 Vol.3 No.2
This study was performed to investigate the cytotoxicity of Adriamycin on the cultured chicken embryonic skeletal muscle cells. The effect of A-driamycin on the morphological differentiation, cell fusion and the total amount of protein in cultured myoblasts was investigated at higher doses (0.1, 0.5, 1μg/ml) and lower doses(0.05, 0.1μg/ml) of Adriamycin. The results were as follows : 1. When cultured myoblasts were exposed to lower concentrations of Adriamycin, 0.05μg/㎖ and 0.1μg/ml, cell proliferation was inhibited partially and cell fusion index was decreased slightly than that of the control group. Cultured myoblasts were treated with higher concentrations of Adriamycin, 0.1, 0.5 and 1μg/ml for 1 hour and then incubated in Adriamycin-free medium. Cell proliferation and cell fusion index were similar to those of the control groups in 0.1μg/ml of Adriamycin, and at 0.5μg/ml and 1μg/ml of Adriamycin, cell proliferation was inhibited slightly but cell fusion index was more increased than that of the control group in myoblasts exposed to Adriamycin for 120 hours. 2. In the total amount of protein of myoblasts cultured in lower con-centrations of Adriamycin, 0.05μg/ml and 0.1μg/ml. The longer the myoblasts exposed to Adriamycin, the more total amount of protein of myoblasts decreased, dose-dependently. In the total amount of protein of myoblasts exposed to higher concentrations of Adriamycin, 0.1μg/ml, 0.5μg/ml and 1μg/ml, the total amount of protein in 0.1μg/ml of Adriamycin was similar to that of the control group but at 0.5μg/ml of Adriamycin, the total amount of protein was decreased remarkably than that of the control group. From the above results it is suggested that Adriamycin decreaes the total amount of protein and inhibits the cell fusion of the cultured myoblasts.
A Gravity Model Analysis of Measuring Services Trade Barriers
유태환,박순찬 한국무역학회 2011 Journal of Korea trade Vol.15 No.4
For the past several decades, economic development in Korea has depended heavily on an export-led growth strategy focused on manufacturing. Services industries are less developed and less productive due to numerous protection policies interrupting competition. In recent years, the Korean government has developed a plan for service sector reform geared towards the development of the services industry. Achieving this goal requires strengthened competition through the reduction of trade barriers. The objective of this study is to measure the barriers to cross-border trade in Korean service sectors. Services trade barriers do not take the form of import tariffs, but rather of a complex variety of quantitative restrictions, prohibitions, and regulations. This study estimates tariff equivalents using a gravity model for overall services industries and for three traded service sectors of each of 47 countries. The estimate of tariff equivalents in overall Korean services is 73.3%, higher than the average tariff equivalent of 48.8% for 24 high-income Organization for Economic Cooperation and Development (OECD) member countries, but lower than values for most developing countries. Specifically, we show that Korean business and financial services are comparatively sheltered from international competition, resulting in low levels of import penetration. However, Korea’s transportation services are more open than the other sectors.
유태환,이형호 한국광학회 2002 광학과 기술 Vol.6 No.2
현재, 가입자들은 다양한 매체 접속의 호환성과 통신 시장의 변화에 있어서 가장 적절한 기술과 제반사항을 지원하며, 또한 현 통신 시장의 흐름을 적소에서 요구되어지는 새로운 시스템 설치 및 새로운 망을 구성시 비용절감 효과를 누릴 수 있는 새로운 기술을 요하고 있다. 새로운 변화에 부응하여 IEEE 802.3 에서는 현 통신 시장에서 앞으로 나아갈 제 4세대라고 불리울 수 있는 NGN(Next Generation Networks) 시장에 새로운 향방을 제시하고 있으며, xDSL 표준안 과 이미 상호 호환하는 이더넷 기반의 제품들을 선보이고 있다. 회선기반의 네트워크에서 패킷기반으로서의 전환이 전화서비스를 포함하여 새로운 사업모델을 포함하는 데이터 서비스와 기타 부가서비스 분야에서 매우 빠르게 이루어지고 있는 가운데, 기존의 회선 기반 네트워크와 새로운 패킷기반의 네크워크의 상호 보완적 진화차원의 액세스 전송기술에 대한 필요성이 높아지고 있다. 본 고에서는 차세대 전송기술이라고 불리고 있는 다양한 솔루션에 대해 기술적인 현안을 짚어 보고 향후 통합액세스기반의 광가입자망 전송기술 적용방안에 대해 살펴본다.