흡연자에서 내피세포 의존성 혈관이완 반응과 비타미 C의 단기효과

최락경,고충원,임달수,황흥곤 世宗醫學硏究所 2000 世宗醫學 Vol.17 No.2

골프 클럽의 스윙궤도와 스윙면에 대한 고찰

성낙준 한국운동역학회 2004 한국운동역학회지 Vol.14 No.1

R. J. Sung. A Study on the Swing Path and Plane of the Club in Golf Swing. Korean Journal of Sport Biomechanics, Vol. 14, No. 1, pp. 99-115, 2004. In order to know the correct swing methods in golf swing, it is important to understand the whole swing path but also the concept of swing plane. But, most amateur golfers don't know the concept of swing plane well. Therefore this study was trying to make a good material that makes the concept of swing plane easy to understand. A good swing motion data was obtained from a professional golfer using the three dimensional DLT method. This swing motion was divided into 10 phases and evaluated using the concept of swing plane. The result of the analyze show a good matches between the path of the club and swing plane. This result was summarized as a 3 dimensional graphics to provide a good material to teach the golf swing well.

家庭環境이 學業成績에 미친 影響에 관한 硏究 : 국민학생과 중학생을 중심으로

柳珞柱 광주대학교 1989 論文集 Vol.6 No.-

What the writer has attemptad in this study is to find out any effect of the student's(premary and middle school students) achivement on the home envirnment. The results of this study were as follows ; 1. The students with the higher academic achiuement scores are more prominent in the aspect of family members' affection, their mutual aceptence and physical environment than those with lower ones. 2. The most important factor which imfluenced the academic achivements is found to be the role expectation for primary school children and the physical environment for middle school students. 3. The degree of prediction which home envirorment factors predict the academic achivements indicates 12% in primary school children and 14% in middle schood students. In conclusion, the analysis of the preceding data seems to support a coulusion that the home environments are positively related to one's academic achivements.

AISI 4340 ?? 鋼의 衝擊에너지와 ??값 사이의 相互關係에 관한 硏究

성낙원,심봉식 東亞大學校 大學院 1986 大學院論文集 Vol.11 No.-

Charpy V-notch impact test and compact tension test in the enviroment of high and low temperature on the specimens of N?C?M? steel have been conducted. This paper is to evaluate the correlation between CVN and K? test results as a function of temprature. The results of this study are as follows. 1. The transition temperature by the effect of impact absorption energy from lower shelf to upper shelf have the tendencies of increasing with the incrase of temperature. 2. The value of K? measired from compact test is linearly increased with the increase of temperature. 3. The empirical correlation between impact energy and value of K? is obtained as K?/E=3.2545(CVN)-5.0064 and the rates of the erro from the test results are within 7pe cent.

複合組織鋼의 低 및 高 사이클 疲勞特性에 관한 硏究(Ⅱ) : 高사이클 疲勞特性

成洛元 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-

In this study, a series of experiments on the dual phase steel with different grain size are performed to investigate high cycle fatigue properties. Specimen of SM 20C steel, matrix material and the dual phase steel consisting of three different sized grains were subjected to a series of high cycle fatigue test. The crack propagation rate in the high cycle fatigue region also has been examined taking in to consideration of crack closure effect. The test results in high cycle region show that the propagation rate in most range of stable crack propagation, second stage, are linealy aranged by using the effective stress intensity factor range. Dual phase steel are superior to SM 20C steel in fatigue limit and has longer fatigue life. The ratio of fatigue propagation life and fatigue limit are decreased as it approches to the value of fatigue limit. The aspect ratio of the surface crack length and the depth show constant slope between 0.68 and 0.78. The curve of U, the ratio of effective stress intensity factor range versus crack length show an asymptote to the constant value as the crack length increase. Through above mentioned experimental results, it is also found that the crack propagation rate is quite dependent to the crack length and stress amplitude in the local range. And fatigue life of the dual phase steel in the region of stable crack propagation could be predicted in term of effective stress intensity factor range.

작물 수량과 쏘스-씽크 관계

성락춘,최규훈,박세준 高麗大學校 自然資源科學硏究所 1996 自然資源科學硏究 Vol.4 No.-

인체 공중 동작 시뮬레이션 프로그램 개발

성낙준,권영후 한국운동역학회 1994 한국운동역학회지 Vol.4 No.2

A comprehensive simulation software package was developed in C base on the work done by Yeadon et al.(1990) and Kwon (1993a) in the aim of making it easy to apply the experimental simulation technigues to the human airborne movement studies. This package consists of 3 programs: simulation variable computation program (PREP), simulation program (SIM) and the 3-dimensional graphic program (3DMAN). All programs are driven by an easy-to-use menu system and written compatible to KWON3D Motion Analysis Package Version 2.1 (Kwon, 1993b). Program PREP consists of 4 menus: `Edit Data´, `Prepare´ `Angular Momentum´ and `Optimization´. The `Edit Data´ environment is an editor for the lengths of the segments and body lines. The `Prepare´ menu computes the internal orientation angles of the segments while the `Angular Momentum´ menu computes the mean airborne angular momentum of the body and other initial conditions such as the initial position and velocity of the body CM and the initial external orientation of the body. The `Optimization´ menu performs angular momentum optimization proposed by Kwon (1993a). A geometric 15-segment body model - Yeadon-Kwon model (Kwon, 1993b) - with at most 38 degrees of freedom including 3 external orientation angles (somersault, inclination and twist angles) was employed to compute the simulation variables. SIM consists of 2 menus: `Edit Angles´ and `Simulate´. The `Edit Angles´ environment is an editor for the internal orientation angles of the segments. Users can intentionally manipulate the internal orientation angles for the simulation of modified trials. The program displays time-angle curves segment by segment. The `Simulate´ menu actually performs simulation. The initial conditions can be directly manipulated in the program menu environment. The simulation program was tested by several theoretical configurations to screen out the flaws in the theory and to isolate coding mistakes. The simulated results were compared with the predicted results and the program showed good agreements between the simulated results and the theoretical predictions. The simulation program was then applied to several gymnastic maneuvers and springboard dives for testing. 3DMAN was developed in the extension of the traditional `Stick Figure´ graphics. The program is segment-oriented and the 3-D shape of each segment is defined defined independently in a graphic model file to allow the users to use different body models with different, combinations of segments. The model file was designed easy to edit so as to allow the users to change the graphic model easily to meet their specific needs. The graphic model file can be edited using any text editor such as `EDIT´ of DOS. Once the `3-D Graphics´ option is activated followed by the registration of the graphic model files, the program draws the 3-D shapes of the segments whose model files are registered. All the graphics-related menus including registration of the segment graphic model files are accessible within the graphic environment.

高溫疲勞에서 싸이클依存型 및 時間依存型 疲勞크랙傳播의 遷移 : 싸인應力波 및 사디리꼴應力波에 대하여

成洛元,周原植,韓根祚 東亞大學校 大學院 1984 大學院論文集 Vol.8 No.2

A study on the nonlinear fracture mechanics was made on the low-cycle fatigue crack growth in SUS304 stainless steel under trapezoidal and sine stress wave at 650℃. The high temperature low cycle fatique crack growth behavior was classified into two categories: cycle-dependent and time dependent. The cycle-dependent crack growth rate correlated well with J integral range ?J, whereas the time dependent crack growth rate was characterized by modified J integral Jex. A parameter βwas found useful in predicting the transition from the cycle-dependent crack growth to the time-dependent crack growth. Conducting the experiment of high temperature fatigue crack propagation in trapezoidal, and sine stress wave, following conclusions were obtained. 1. Crack propagation behavior can be classified into cycle-dependent and time-dependent. 2. The transition of cycle-dependent crack propagation to time dependent one could be predicted bt either parameter βor ?J/ ?J?.

旋削時 떨림振動抑制用 動吸振器에 관한 硏究

成洛元,安贊祐,金賢洙 東亞大學校 大學院 1984 大學院論文集 Vol.8 No.2

This searched for conditions of the optimum absorber to eliminate the chatter vibration by the computer and its effects were confirmed experimentally. The results are as follows. 1. The amplitude ratio of workpiece according to mass ratio was obtained in the optimum absorber by computer. 2. The forced frequency ratio at maximum amplitude ratio according to mass ratio was obtained in the optimum absorber by computer. 3. By direct contact between workpiece and absorber the effects on the elimination of chatter vibration were confirmed.

지식의 구조적 표현의 문제점과 그 개선방안에 관한 연구

鄭樂宇 서강정보대학 1992 論文集 Vol.11 No.-

Computer system, understanding a part of the syntactic knowledge of our natural language, can be thought as a reasonable message maker. The basic of developing this kind of system, being able to understand a part of our spoken or written language, is on the principles of Artificial Intelligence technology that can present a syntactic structure and reason something from it. The purpose of this study is to observe the presenting way of the syntactic structure and to find its problem, and to present a improving method for it.