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하키 페널티 코너 시 슈팅 방향에 따른 고등학교 선수의 플릭 슈팅 동작 비교
우상연;최성범;김호묵 순천향대학교 기초과학연구소 2010 순천향자연과학연구 논문집 Vol.16 No.1
The purpose of this study was to compare and analyze flick shooting motion in penalty comer according to the stroke direction. Five high school players participated in this study. The 3D kinematic data were collected for each subject performing the penalty comer stroke. The results of the study were as follows: 1) step length and drag length of ball(at the X axis) were larger in right side attacks than in left side attacks, 2) drag length of ball(at the Y axis) were larger in left side attacks than in right side attacks, 3) stick velocity were larger in downward side attacks than in upward side attacks, 4) range of shoulder rotation were lower in right upward side attacks than in the other sides, 5) hip angle were larger in left upward side attacks than in the other sides.
저질에 따른 꼬막(Tegillarca granosa)의 염분내성
한경호,진동수,추은경,이우범,이원교 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-
The present study was conducted to know the salinity tolerance of the bloody clam, Tegillarca granosa (Linnaeus) caught in Gang-jin Bay from May to June in 2000. In the experimental groups of sandy-mud, the survival and infiltration rate were not bad at 20~40ppt, but all the bloody clam, Tegillarca granosa died at more than 50ppt and less than 10ppt before the experiment finish. In the experimental groups of muddy, the survival and infiltration rate wrer not bad at 20~35ppt and then 40ppt, 45ppt. All the bloody clam, Tegillarca granosa died at more than 50ppt and less than 10ppt. The infiltration rate was high at 25~35ppt in the both of two experimental groups. In the sandy-mud, the bloody clam, Tegillarca granosa infiltrated less than half of their shells at 25ppt, 30ppt but in the muddy, they infiltrated more than half of their shells at 25ppt, 30ppt, 35ppt.
테니스 포핸드 스트로크 시 왼팔의 이용 유무가 스트로크의 정확성에 미치는 영향
우상연,최성범,김호묵 순천향대학교 기초과학연구소 2011 순천향자연과학연구 논문집 Vol.17 No.1
The purpose of this study is to analyze and compare accuracy and kinematic characteristics of forehand strokes upon using the left-hand and non the using left hand in tennis. Six unskilled collegiate players who complied primary tennis course participated in this study. Subjects were requested to hit 10 balls with 4 types each: first, it was two directions(down the line, cross), second, it was two velocities(slow ball, fast ball) and then it was type of using left hand. Variables such as accuracy, time, distance, angle and velocity variables were measured by USPTA method and video cameras. The results of this study are as follows: 1) accuracy of hitting balls was not different according to the type of using left hand. While there was an interaction between ball velocity and hitting direction. 2) impact positions of hitting ball were not different according to the type of using left hand. While impact positions were done near by target direction in cross direction then down the line direction. 3) shoulder rotation angle was not different according to the type of using left hand. While shoulder rotation angle was grater in down the line direction than cross direction. 4) the maximum velocity of racket head was faster in using left hand than non using left hand.
비선형 광섬유 신호의 수치해석을 위한 단계분할 유한요소법
鄭白鎬,李範雨,李鎬俊 湖西大學校工業技術硏究所 1999 工業技術硏究所論文集 Vol.18 No.-
In this paper, nonlinear Schrodinger equation have been analyzed to predict signal propagation in optical fiber using split-step finite element method (SS-FEM). Formulation was employed to take into consideration of dispersion, absorption and nonlinearity together. Also, higher-order term (β₃) in dispersion parameters could be treated by using cubic elements. Results obtained from SS-FEM were accurate comparing with some analytic solutions.
저질에 따른 바지락(Ruditapes philippinarum)의 염분내성
한경호,오성현,장선익,이우범,이원교 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-
Salinity tolerance of the manila clam, Ruditapes philippinarum in Gang-jin Bay on the from May to June was investigated in two different types of sedimentary composition. In the experimental groups of sandy-mud, the survival and infiltration rate were good at 20~40ppt, but all the manila clam, Ruditapes philippinarum died at more than 50ppt and less than 10ppt before the experiment finish. In the experimental groups of muddy, the survival and infiltration rate were the best at 25~35ppt and then 20ppt, 40ppt. All the manila clam, Ruditapes philippinarum died at more than 45ppt and less than 15ppt. The survival rate in the experimental groups of sandy-mud was higher than muddy ones, and the infiltration rate was the highest at 20~35ppt in the both of two experimental groups. In the sand-mud, the manila clam, Ruditapes philippinarum infiltrated half of their shells but in the muddy, they infiltrated more then half of their shells.
강윤호,이우범 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-
A three-dimensional water quality-layer integrated-model has been developed to calculate distribution of solute concentration including nutrients(N, P), phytoplankton, etc. In the governing equation for the model, advection terms are treated using the QUICKEST scheme and ULTIMATE algorithm, which are of 3rd order accuracy in space and time, and highly stable for nonlinear terms, respectively. In this study, the model has applied to Paldang dam, Korea. For the model calibration and verification, measured levels of various water quality parameters are compared at various points along the study region during 1999.3~12. In particular, bed fluxes from bottom sediments are focused to accommodate spatial variation of pollution. The model results in good agreements with the measured. Hence, it is concluded that the developed model can be very useful in predicting reservoir water quality with a high accuracy.
강윤호,이우범,이삼노 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-
Water quality in a reservoir is subject mainly to hydrodynamic structure. Paldang reservoir can be classified into a riverine-type, with small storage capacity and short residence time. Bukhan and Namhan rivers and Kyongan stream join at the Paldang reservoir. In particular, the confluence area with Kyongan strean and main channel of the reservoir has limited exchange rate of mass due to shallow depth and little discharge of inflow. It has been reported in recent 10 years that water quality was deteriorated, in the confluence area, with the reason believed due to high pollutant load and low exchange rate. Hence, investigation is required to understand the processes of pollutant transport along the region and provide solution to reduce pollutant levels. In this study, a particle tracking/random walk model is used to calculate residence time. The simulation results in residence time of 35, 22 and 8 days, respectively, for low, median and fruitful water levels. However, it was found that there was little difference between the cases with and without peak load from Chungpyung Dam upstream the Bukhan river. This result is not identical with the calculated using hydrological records. This is belived to be caused by that hydrological data cannot correctly give residence time when flow travels upward, yielding water mass increase and corresponding mixing effects.
鄭白鎬,李華鎔,李範雨 호서대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.19 No.-
In this paper, an investigation of microwave coupling between waveguide and cavity with a lossy dielectric material by the Finite- Difference Time-Domain (FDTD) method is undertaken. We have assumed that the waveguide is excited by the magnetron which is modeled as a monopole with a delta gap source or frill generator. Numerical simulation indicates that the shape of cavity becomes very important when predicting the dissipated power distribution for a lossy dielectric material inside a cavity.
이준우,박범진,최윤호 충남대학교 농업과학연구소 1998 농업과학연구 Vol.25 No.1
Three major trails of campus forest in Chungnam National University were selected to investigate the use impacts on environmental deterioration of trail according to the different amount of use. Rook-exposed, root-exposed, deepening, widening, diverged points as the deterioration types of trail which were surveyed at total of 92 points in major trail of campus forest in Chungnam National University. Major deterioration types of trail were widening, rock-exposure, root-exposure, in order of frequency. And trail conditions(trail slope and maximum depth) of deteriorated points were significantly different from those of non-deteriorated points.