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윤창한 대한의용생체공학회 2017 Biomedical Engineering Letters (BMEL) Vol.7 No.4
The purpose of this study is to investigate aspectrum analysis technique for detecting and monitoringred blood cell (RBC) aggregation using a high-frequencyarray transducer. To assess the feasibility of this approach,the backscattered radio-frequency signal from non-aggregatedand aggregated RBC samples with two hematocritlevels were acquired by using a 30-MHz linear arraytransducer and analyzed in frequency domain. Threeparameters such as spectral slope, midband fit and Y interceptwere extracted in a static condition. Fresh porcineblood was used and degrees of aggregation were changedby diluting plasma concentration. From the experiments, itwas demonstrated that the spectral slope related to a size ofscatterer progressively declined as the level of aggregationincreased; its mean values at hematocrit of 40% were 1.10and -0.22 dB/MHz for RBCs suspended in isotonicphosphate buffered saline and solution with 70% plasmaconcentrations, respectively. For the midband fit and Y intercept,the mean values were increased by 9.1 and46.4 dB, respectively. These results indicated that thespectrum analysis technique is useful for monitoring RBCaggregation and can be potentially developed for assessingaggregation in clinical applications.
WTO의 전자상거래(電子商去來) 논의동향(論議動向)과 시사점(示唆點) - GATS의 논의를 중심으로 -
윤창인,Yoon, Chang-In 한국무역상무학회 2000 貿易商務硏究 Vol.13 No.-
Electronic commerce facilitates trade and lower transaction cost can help firms make use of the opportunities of globalization of production and markets. Electronic commerce has broad implications for future trade. These implications include the effect on trade policy making and enforcement. And it is important to ensure that the present and future trading system de jure and de facto allows electronic commerce to realize its potentials as an alternative or a complement to conventional trade. The comprehensive work program had been implemented to examine all trade-related issues relating to global electronic commerce before the Seattle 3rd Ministerial Conference which was suspended. In general, Member countries recognized the need to ensure that electronic commerce in all its forms is conducted in full conformity with WTO principles and rules. But, there are still major issues to be solved such as access to relevant electronic systems, competition policy in telecomnunications services, WTO provisions relating to the protection of IPRs, the clarification of a number of key concepts and definitions, etc.
질산염이 다량 축적된 Italian ryegrass 급여에 따른 면양의 혈액중 Methemoglobin 농도의 경시적 변화
윤창,전우복,송명희 ( C . Yoon,W . B . Chun,M . H . Song ) 한국축산학회 1989 한국축산학회지 Vol.31 No.12
This study was conducted to investigate the influence of nitrate accumulation in Italian ryegrass feeding on the change of methemoglobin and hemoglobin in sheep. 12 Corriedale wethers(average body weight 33kg) were fed Italian ryegrass containing average 0.469% N0₃ N. Blood samples were taken at l hour before feeding and 4, 5, 6, 7, 8, 9, 10 hours after feeding, and then hemoglobin and methemoglobin concentration in blood were determined. The results obtained were summerized as follows ; 1. No significant difference was observed in the changing pattern of hemoglobin concentration in blood. 2. There were large variations among the test animals in the capacity of methemoglobin formation of the Italian ryegrass feeding.