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경두개 도플러 초음파(TCD) 검사를 이용한 뇌동맥류 파열 환자의 임상적 분석
정용태 인제대학교 1994 仁濟醫學 Vol.15 No.1
1992년 3월 1일부터 1992년 6월 30일까지 4개월간 본원 신경외과에 내원하여 수술시행하였던 뇌동맥류 파열 환자 52례 중 만족할만하게 뇌혈류 속도가 측정되지않았던 12례를 제외한 40례에서 중대뇌동맥의 평균혈류속도를 TCD를 이용하여 측정하였다. With the transcranial ultrasonic Doppler(TCD) technique described 1982 by Aasild et al, it is possible to record the blood flow velocities in the basal arteries through the intact cranium. The clinical material for this study consists of 40 patients with ruptured aneurysms who were operated from March 1992 through June 1992. Sixteen individuals(Group A) were operated within 3 days, while the other 24(Group B) had surgery between 4 and 11 days after subarachnoid hemorrhage (SAH), TCD was used to evaluate flow velocities within middle cerebral artery(MCA) at least every other day for one month. To prevent symptomatic vasospasm, Nimodipine was intravenously infused in doses of 2mg/hour for 2 weeks in all patients. In the first 3 days post-SAH, no increased flow velocities suggestive of arterial narrowing or vasospasm were recorded. There was no significant difference in preoperative flow velocities between the groups but a tendency of early peak velocity in the Group A while late peak in the Group B.
정용태,김경완 順天靑巖大學 1994 論文集-順天靑巖大學 Vol.18 No.-
The stochastic structures of water quality time series were examined. These time series include daily observations in streamflow, water temperature, BOD, and dissolved oxygen deficit. Autoregressive integrated moving average(ARIMA) models were used to describe the random components of these time series. It was found that except for the BOD the Arima models could provide very satisfactory results.
유로만곡부(流路彎曲部)의 곡율비(曲率比)와 곡율계수(曲率係數)에 관한 연구(硏究)
정용태,이진은,송재우,Chung, Yong Tai,Lee, Jin Eun,Song, Jai Woo 대한토목학회 1991 대한토목학회논문집 Vol.11 No.1
운동량방정식을 이용한 하천만곡부 외측제방에 작용하는 단위면적당 수류력은 흐름의 특성, 토사의 특성 및 만곡부의 기하학적 인자의 함수인 곡률계수로 표현할 수 있다. 일반적으로 곡률비가 2.0~4.1인 경우에 외측제방에 작용하는 수류력이 가장크게 나타나는데 한강하류부의 경우 곡률비가 2.0~4.0에 집중된 것은 전구간에서 제방침식을 받게될 가능성이 높을 것으로 사료되어 하천개수계획수립시 필수적으로 고려되어야 하며 철저한 호안공 등의 방법으로 보완되어야 할 것이다. 한편 곡률계수가 최대인 곡률비의 범위가 1963년의 경우 2.21~4.42이고 1981년에는 1.93~3.54이며, 인위적인 하천개 보수공사를 고려한 년간 평균유로이동률이 1967년까지 4.68m/yr이고 1981년까지는 10.48m/yr이다. Based on the momentum equation for the flow in a stream bend, the force per unit area which the flow exerts on the outer of a bend is directly proportional to a certain curvature coefficient, $C{\alpha}$. This coefficient is dependent on the ratio of bend radius(R) to flow width(W), as well as on the coefficient of dynamic bedload friction, $tan{\alpha}$. According to the results of the data analysis for the downstrream at the Han river, the range of R/w values is between 2.0 and 4.0. Exploring the variations of $C{\alpha}$ with R/w values a functional relationship which, for the known values of $tan{\alpha}$, shows maximum values of $C{\alpha}$ for R/w values between 2.21 and 4.42 in 1963, while in 1981 its values lied between 1.93 and 3.54.