방사성 同位元素를 이용한 小溜池堤防의 浸透水 측정에 관한 연구

이순혁 忠北大學校 1968 論文集 Vol.2 No.-

대퇴 경부 골절에서의 stress와 strain에 관한 연구

이순혁,박상원,이홍건 고려대학교 의과대학 1990 고려대 의대 잡지 Vol.27 No.1

To study change of stress on the femoral neck after internal fixation of femoral neck fractures, comparison of strain on the fernoral neck between before and after femoral neck osteotomy was performed. The author used fourteen embalmed femora, two as control group and twelve as experimental group, which was further divided into two groups by difference of fixation method, and measured strains during loading along the weight-bearing axis with Instron. In two femora of the control group, five strain-gauges were bonded on five spots around the femoral neck and strains on five spots were measured. In twelve femora of the experimental group, two strain-gauges were bonded on selected two spots, each showed the highest amount of compressive or tensile strain according to experimental results of the control group among five spots, and strains were measured during loading. Then twelve femora in the experimental group, once loaded, were fixed with Knowles pins(six femora with three Knowles pins longitudinally and six femora with four Knowles pins quadriangularly) after femoral neck osteotomy and were loaded until internal fixation of femoral neck osteotomy failed(maximal loading force), while measuring strains on two spots of femoral neck. The ratio of strain on the same spot of the same femur between after and before femoral neck osteotomy was calculated. The author also observed the relationship between maximal loading force, difference of fixation method of Knowles pins and the ratio of strain between after and before femoral neck osteotomy. The results obtained are as follows : 1. In the femora of normal state, the tensile strain is higher on the antero-superior neck and the compressive strain on the poster on inferior neck of the femur. The strain on the mid-posterior neck was minimal. 2. In the twelve femora before femoral neck osteotomy, the ratio between the tensile strain on the antero-superior neck and the compressive strain on the postero-inferior neck in the same femur ranged from 29% to 92%, the mean value being 62±20.2%. 3. The ratio of the compressive strain on the cortex of the postero-inferior neck of the femur between after fixation of osteotomy and before osteotomy ranged from 47% to 210%, the mean value being 124±90.9% in six femora with three Knowles pins longitudinally and 128±70.6 % in the femora with four Knowles pins quadriangularly. 4. The ratio of the tensile strain on the cortex of the antero superior neck of seven femora, excluding five femora of disproportionally developed tensile strain, between after fixation of osteotomy and before osteotomy ranged from 25% to 80%. 5. The mean value of maximal loading force was 260±45.9Kp in six femora fixed with three Knowles pins longitudinally and 265±41.0Kp in six femora fixed with four Knowles pins quadriangularly. 6. The ratio of the compressive strain on the cortex of the posteroinferior neck of the femur between after fixation of osteotomy with and before osteotomy had close relationship with the maximal loading force. The maximal loading force had the mean value of 303±12.5Kp in six femora with the ratio less than 100%(47%70%) and the mean value of 221±16.9Kp in six femora with the ratio more than 100% (180%210%).

設計洪水量의 誘導를 위한 冪變換과 頻度分布分析의 比較

李淳赫,羅性均 충북대학교 농업과학기술연구소 1990 農業科學硏究 Vol.8 No.2

This study was conducted to pursue the normalization of frequency distribution by approaching the coefficient of skewness to zero through power transformation to the annual maximum series of four watersheds along Han, Guem, Nag Dong river basin. Analysis for the comparison of design flows according to the return periods were carried out between the best fitted probability distribution and power transformation. The results were analyzed and summarized as follows. 1. Power transformation has found to be best one in comparison with log and square root transformation for being the coefficient of skewness into closer zero as a means of getting the normalization of frequency distribution in the annual maxium series for the applied watersheds. 2. The best fitted probability was acknowledged as three paramater lognormal destribution for Jeong sun of Han, Im Ha of Nag Dong river basin and type 1 extremal distribution for Seok Hwa, Gyu Am of Geum river, respectively. 3. Empirical formulas for the probable flood flows and design flows according to the return periods were derivated for the applied watersheds. 4. Relative errors of three parameter lognormals and type 1 extermal distribution to power transformation which was acknowledged as a best fitted probable flows were shown to be within 10 percent in common for all watersheds from two to two hundred years of return period. 5. The part of higher nonexceedance probabilities, i.e. probable flood flows for power transformation leas found to be more approached to the observed data in comparison with the results of other fitted distributions in view of relative suitability.

年流出量의 模擬發生에 관한 硏究

李淳赫,孟昇辰,朴明根 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.10 No.2

This study was conducted to get best fitting frequency distribution for the annual runoff and to simulate long aeries of annual flows by single-season first order Markov Model with comparison of statistical parameters which were derived from observed and synthetic flows at three watersheds in the Yeong San river basin. The results summarized through this study are as follows. 1.Hydrologic persistence for three watersheds were acknowledged by the correlogram analysis. 2.Normal distribution of the annual runoff for the applied watersheds was confirmed as the best by Kolmogorov-Smirnov test. 3.Statistical parameters were calculated from synthetic flows simulated by normal distribution. It was confirmed that those are very similar to statistical parameters of observed data. 4.Hydrologic persistence between observed flows and synthetic flows simulated was confirmed by the correlogram analysis. 5.It is to be desired that generation technique of synthetic flow in this study would be compared with other simulation techniques for the objective time series.

Weibull分布에 의한 確率渴水量의 誘導

李淳赫,趙成甲 충북대학교 농업과학기술연구소 1991 農業科學硏究 Vol.9 No.2

Derivation of probable drought flow was attempted for getting the hydrologic design criterion of various hydraulic structures which can be contributed to the planning of water utilization. Weibull distribution was used for the analysis of drought flow frequency with annual drought flow of three watersheds at Geum, Nak Dong and Yeong San river basin. The results were analyzed and summarized as follows. 1.Basic statistics were calculated for the analysis of extremal distribution to the research watersheds. 2.Necessary parameters were derivated by weibull distribution for the research watersheds. 3.Formulas for the probable drought flow were derivated by the method of weibull distribution and probable drought flow for the applied watersheds were calculated by above mentioned formulas to the return periods of 2, 5, 10, 20, 50 and 100 years. 4.Probable drought flows by weibull method were shown to be much closer to the observed at the research watersheds in general. 5.It is to be desired that weibull distribution used in this study would be compared with other transformation methods for getting the drought flow could be acknnowleged as it estimated in accurate.

TypeⅠ 極値分布의 頻度分析 및 確率圖示法에 의한 設計降雨量의 誘導

李淳爀,孟昇辰,朴明根 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.12 No.1

Derivation of reasonable design rainfall was attempted by comparative analysis of design rainfall derived by frequency analysis of Type I extremal distribution and probability plotting technique for annual maximum 1-day, 1-hour and 10-minute rainfalls observed at Cheong Ju. The results were analyzed and summarized as follows : 1.Basic statistics were calculated for the analysis of Type I extremal distribution with annual maximum 1-day, 1-hour and 10-minute rainfalls at Cheong Ju. 2.Necessary parameters were derived by frequency analysis of Type I extremal distribution for annual maximum 1-day, 1-hour and 10-minute rainfalls at Cheong Ju. 3.Design annual maximum 1-day, 1-hour and 10-minute rainfalls in mm were derived by frequency analysis of Type I extremal distribution and probability plotting technique respectively at Cheong Ju. 4.Design annual maximum 1-hour and 10-minute rainfalls were derived by frequency analysis of Type I extremal distribution and probability plotting technique are shown to be much closer to the observed data but design annual maximum 1-day rainfall is not to be closer to the observed data. 5.Design annual maximum rainfalls following the duration derived by Type I extremal distribution are seemed to be more reasonable than those of probability plotting technique owing to the difference of individual eyefitting.

조형(造形)에 기능(機能) 및 기능주의(機能主義)에 관한 고찰(考察)

이순혁 이화여자대학교 도예연구소 1983 陶藝硏究 Vol.- No.5

Nonoperative Treatment and Closed Reduction and Percutaneous Fixation including External Fixator in the Management of Fractures of Proximal Humerus

이순혁 대한골절학회 1998 대한골절학회지 Vol.11 No.2

N/A

月流出量의 推計的 模擬發生에 관한 硏究

李淳赫,孟昇辰 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.11 No.1

This study was conducted to simulate long series of monthly flows by Harmonic synthetic model and to compare with statistical parameters which were derived from synthetic flows and the observed data at two watersheds in the Geum river basin. The results summarized through this study are as follows. 1. Arithmetic mean values of synthetic monthly flows simulated by Harmonic synthetic model are much closer to the results of the observed data in July. On the other side, relative errors for those of the dry season of January, April and December at Gyu Am watershed and January, February, April and December at Gong Ju watershed make a little defference between the observed data and synthetic monthly flows. 2. In comparison with the coefficients of variation, index of fluctuation for monthly flows simulated by Harmonic synthetic models are much closer to the results of the observed data in July. But, relative errors of May and June at Gyu Am and Gong Ju watersheds make a little defference between the observed data and synthetic monthly flows. 3. It was found that synthetic monthly flows based on Harmonic synthetic model are considered to give better results during July and August. But, the other synthetic monthly flows are seemed to be larger than observed data in the applied watersheds. 4. Continuation studies by comparison with other simulation techniques are to be desired for getting reasonable generation technique of synthetic monthly flows for the main river systems in Korea.

회전축(回轉軸)에 의한 조형성(造型性) 고찰(考察)

이순혁 이화여자대학교 도예연구소 1980 陶藝硏究 Vol.- No.2