Drosophila quinaria Species Group의 遺傳的 近緣關係

成耆昌,金正洙,金大鎰,金彧,金溶聲 성균관대학교 기초과학연구소 1985 論文集 Vol.36 No.2

The genetic relatedness among the Korean Drosophila quinaria species group, including D. nigromaculata, D. unispina, D. brachynephrose, and D. angularis, has been examined by using horizontal starch gel electrophoresis. The results showed that none of the ten isozyme patterns examined for these four species was identical. The average genetic similarity among the four species was found to be 0.440. The similarity among three species. D. unispina, D. brachynephrose, and D. angularis was 0.466. The relatedness was found to be closest between D. nigromaculata and D. unispina, showing 0.640. D. nigromaculata and D. angularis showed relatedness of 0.258. The results suggested that these four species appear to be genetically related at the level of sibling species. The percent polymorphism in D. brachynephrose was found to be 76.9%, showing significant genetic variations.

Wilson θ 법에 의한 橋梁의 動的應答 解析

김기대,홍병희,박성규 大邱大學校 科學技術硏究所 2000 科學技術硏究 Vol.7 No.1

This study presents the use of transfer matrix method to determine the natural frequencies of bridges, and the application of Wilson B method to the analysis of dynamic response of the bridges caused by moving loads. To check the reliability of the theory introduced and the computer program developed, the dynamic responses of single-span and multi-span bridges subjected to moving vehicle loads with constant velocity were studied. The results obtained were compared with the field test results of existing information. It was found that good agreement was achieved, and the conclusions obtained from the observations of analysis inform that can use as rational approach to the dynamic analysis for these problems.

휠체어농구선수의 심리기술과 자기관리 특성 분석

김대현,최승권,김운기 용인대학교 2009 특수체육연구 Vol.6 No.-

본 연구는 휠체어농구선수와 장애가 없이 휠체어농구를 하는 선수 간 심리기술 및 자기관리의 수준과 심리기술이 자기관리에 미치는 영향력을 알아보고자 하는데 목적이 있다. 본 연구는 2008년 현재 대한장애인농구협회에 등록된 모든 선수를 대상으로 실시하였으며, 응답이 부실한 설문지를 제외한 총 106명의 설문지를 대상으로 자료를 분석하였다. 설문에 응답한 106명 중 휠체어농구선수 집단은 59명, 장애가 없는 휠체어농구선수 집단은 47명이었다. 본 연구의 조사도구는 유진(1996)의 운동선수 심리기술 검사지와 허정훈(2003)의 운동선수 자기관리 검사지를 사용하였다. 조사도구에 대한 타당성 검증은 탐색적 요인분석을 실시하였고 신뢰도 검증은 Cronbach's α를 실시하였다. 조사한 자료의 분석은 two-way ANOVA, Multiple Regression analysis를 실시하였으며, 유의수준은 α<.05로 설정하였다. 자료 분석 결과, 첫째, 장애유무와 포지션에 따른 심리기술에서는, 휠체어농구선수집단이 집중력과 불안조절에서 장애가 없는 휠체어농구선수 집단보다 높은 수준을 나타냈다. 둘째, 장애유무와 경력에 따른 심리기술 중 목표설정과 심상에서 경력이 짧은 집단은 장애가 없는 휠체어농구선수집단이 높은 수준을 나타냈고, 그와 반대로 경력이 오래된 집단에서는 휠체어농구선수집단이 높은 수준을 나타냈다. 또한, 경력 4-6년 집단이 목표설정과 심상에서 제일 높은 수준을 나타냈다. 셋째, 선수들의 심리기술이 자기관리에 미치는 영향에서는 몸관리에서 목표설정과 팀조화가 영향을 미쳤고, 대인관리에서는 팀조화, 심상, 의지력이 영향을 미쳤으며, 훈련관리에서는 의지력, 심상, 목표설정, 팀조화가 영향을 미치는 것으로 나타났다. 이에 따라, 경기력 향상을 위해서는 휠체어농구 선수들에게 체력훈련과 기술훈련 외에 심리훈련을 병행 실시해야 할 것이다. The purpose of this study was to examine the level and relative influence of the psychological skills and self-management of wheelchair basketball athletes and able-bodied wheelchair basketball athletes. The subjects in this study were carried with every athlete who registered with the Korea Wheelchair Basketball Federation. After a survey was conducted, the answer sheets from 106 participants were analyzed except for incomplete ones. Out of the 106 respondents, 59 persons were WA group, and 47 persons were AWA group. The instruments used in this study were Yu Jin's Athlete Psychological Skills Inventory and Heo Jeong-hun (2002)'s Athlete Self-Management Inventory. To verify the validity of the instruments, an exploratory factor analysis was carried out, and Cronbach alpha coefficient was utilized to test their reliability. For data analysis, two-way ANOVA, one-way ANOVA and multiple regression analysis were employed, and the level of significance was set at α<.05. As a result of data analysis, First, as for the relationship of the presence or absence of disabilities and position to psychological skills, the WA group was ahead of the AWA group in concentration and anxiety-control. Second, concerning the relationship of disabilities and career to psychological skills, the less-experienced athletes of the AWA group excelled their counterparts of the WA group at goal-setting and imagery, which were two of psychological skills. In the event of the experienced athletes, however, the WA group surpassed the AWA group in those regards. The athletes who had served as athletes for four to six years were most excellent in goal-setting and imagery. Third, the grade of skills made no difference to their level of psychological skills and self-management. Fourth, as to the impact of psychological skills on self-management, their healthcare was under the influence of goal-setting and teamwork; and teamwork, imagery and will-power had an impact on interpersonal skills. Training-management was affected by will-power, imagery, goal-setting and teamwork. Consequently, in aim to advance the athletic performance, it should co-apply psychological practice for the wheelchair basketball players in accordance with physical training and technical skill.

골프 라운딩 환경이 스포츠 몰입과 경기결과에 미치는 영향

김장환,임대욱,박진기 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The present study analyzed change in golf players' performance and their immersion in sports according to golf rounding environment and change in golf players' performance according to their immersion in sports, with the object of providing basic materials for improving the quality of golf participants' golf activities. The subjects of this study were golfers who had just finished their golf rounding, A total of 250 golfers were selected through random sampling. Data were analyzed statistically through factor analysis, t-test, one-way ANOVA and regression. First, the condition of golf course and fairway and the manner of companions affect the player's psychological expectation in the golf rounding, preference for golf, desire to play golf, and perception on golf. Second, weather, the condition of golf course and fairway, the difficulty of golf course and the manner of companions affect the player's psychologcal expectation in the golf rounding, preference for golf, desire to play golf, perception on golf, information about golf, and interest in golf related imaginary acts. Third, immersion in acts according to the type of golf rounding was higher in competition than in leisure, This suggests that golf players who play golf for competition is more interested in golf acts than those who play for leisure. Fourth, golfers' performance is expected to be higher ft they have a good sleep on the previous night, if the condition of golf course and tee ground is satisfactory, and if they play with well-mannered companions. Fourth, golfers' performance is expected to be higher ft they have a good sleep on the previous night, if the condition of golf course and tee ground is satisfactory, and if they play with well-mannered companions. Fifth, golfers' performance is expected to be higher if they have high psychological expectation in the golf rounding, strong preference for golf, strong desire to play golf, and high immersion in golf competition.

水平曲線 H形보의 Warping의 影響에 關한 硏究

김기대 대구대학교 산업기술연구소 1986 産業技術硏究 Vol.5 No.-

The virtual work method for the analysis of horizontally curved girders is adopted in the present research. The girders were used continuous spans having constant circular-are curvature in a span, H-shaped constant cross sections, constant moments of inertia, and concentrated loadings. The virtual work method was in which the effect of warping restraint is not considered. Numerical examples were compared with the values of the differential equation method. It is found that shear force and bending moment were slightly effected, but deflections were more greatly.

익수환아의 예후에 영향을 미치는 인자에 관한 연구

김용배,정대봉,조수형,조남수,박영봉,박상기,김춘호,양은석,문경래 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3

Drowning is the second most common cause of accidental death of children in Korea. But the study of near-drowning is very rare in Korea. The purpose of our study is to determine the factors that may influence survival on the basis of submersion time, consciousness state upon admission to hospital, the kinds of water, laboratory findings and neurological outcomes. The survey was performed by a retrospective cohort study on 28 near-drowning victims of less than 15 years of age who were admitted to the emergency room in the Chosun University Hospital between May 1988 & May 1997. The results were as follows :1)Sex distribution was 22 males and 6 females. 2) Submersion time was <5 minutes in 9 cases, 5-9 minutes in 6 cases, 10-14 minutes in 5cases, 15-19 minutes in 3 cases, ≥20 minutes in 5cases. 3) Comatose patients upon arrival were 6/7 cases in the death group(86%) and 2/21 cases in the improved group(10%). They had unfavorable outcomes(P<0.05). 4) The first PH value was mean 7.02±0.12 in the death group and mean 7.31±0.13 in the improved group. There was a statistically significant difference between the death and the improved group(P<0.05) 5) The patients who gad increased blood glucose concentration were all 7 cases in the death group and 12/22 cases in the improved group(54%). The mean blood glucose concentration was mean 424.7235.6㎎/㎗ in the death group and mean 140.182.7㎎/㎗ in the improved group. There was a statistically significant difference between the death and the improved group(P<0.05). 6) The patients who had pulmonary edema upon arrival were all 7 cases in the death group and 1/21 cases in the improved group(46%). They had unfavorable outcomes(P<0.05). 7) The patients who had been submerged more than 15 minutes were all 7 cases in the death group and 6/21 cases in the improved group(5%). They had unfavorable outcomes(P<0.05). We conclude that pediatric victims of near-drowning can be assigned to high or low likelihoods of unfavorable our outcomes with the use of five variables ; comatose mentation upon arrival decreased initial blood pH, increased initial blood glucose concentration, pulmonary edema, and maximum submersion time estimated longer than fiften minutes. This prediction rule may be useful if it can be validated in another cohort.

多目的 計劃法에 의한 合成PC橋의 最適化

金基大,朴聖圭,林鍾國 大邱大學校 科學技術硏究所 1999 科學技術硏究 Vol.6 No.2

This paper is to propose optimum Design with the multiobjective function for the composite PCI girder algorithm by the SLP method, which is able to get a optimum solution easily by the use of the linear programming method in order to design a practical composite PCI girder bridges. To verify, the reliability of results, this method was applied to the composite PCI girder bridge which is being used in fields now. As a result, the algorithm of this paper was revealed easy and practical to get the PCI girder space, the optimum prestress, and the eccentric space.

초등학교용 웹 기반 교수-학습 자료 개발 전략

김홍래,정인기,신준식,이대형 춘천교육대학교 과학교육연구소 2001 과학교육연구 Vol.25 No.-

耕耘實驗을 爲한 人工土壤의 物理的 特性에 關한 硏究

金基大,許潤根,金滿秀,金聲來 충남대학교 농업과학연구소 1978 農業技術硏究報告 Vol.5 No.2

For improvement and new design of tillage equipments, indoor test is very useful and more desirable than outdoor because the experiment of ourdoor is very difficult and its cost is expensive. This study was carried out to determine the physical properties of artificial soil suitable for the indoor test with the soil bin manufactured at the workshop of the Dept. of Agricultural Machinery Engineering. The artificial soil being studied was made with very similarity to the natural soil of the experimental plots of Chungnam National University, and it consist of 39.35 percent, by weight of bentonite and 48.10 percent of sand with 12.55 percent of SAE 10W oil. The results are summarized as follows: 1. Bulk density increased with increasing number of rolling, and its relationship could be expressed. y=1.073200+0.07080x-0.002263x^2 where, y=bulk density(g/㎤), x=number of rolling. These results could be explained that the effect of rolling velocity on the bulk density was not singnificant in the range of 4.5∼10.4 cm/sec. 2. The absolute soil hardness depended directly upon number of rolling, and their relationship could be expressed by the equation. y=37.74(0.64+0.17x-0.0054x^2)/(3.36-0.17x-0.0054x^2)^3. where, y=absolute soil hardness(kg/㎤), x=number of rolling. 3. Relationship between the bulk density and absolute soil hardness could be expressed by the equation; y=37.74(2.46 x-2.02)/(6.02-2.46x)^3. where, y=absolute soil hardness, x=bulk density. 4. The cohesion and the angle of internal friction of artificial soil were increased with increasing its bulk density. According to the cohesion and angle of internal friction, at the range of 1.60∼1.75(g/㎤) of bulk density, this artificial soil was similar with sandy loam of 29.5% moisture content of natural soil. 5. Sliding-fricfion coefficient of steel plate on the artificial soil was 0.3∼0.4 and rubber plate on it is 0.64∼0.72. Those values were very similar with those of natural soil being studies by many others.

직렬 리액터를 이용한 계통연계형 태양광 발전 시스템

金大均,鄭春炳,全基英,李丞煥,吳鳳煥,李勳九,金容珠,韓慶熙 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-

Since the residential load is an AC load and the output of solar cell is a DC power, the photovoltaic system needs the DC/AC converter to utilize solar cell. In case of driving to interact with utility line, in order to operate at unity power factor, converter must provide the sinusoidal wave current and voltage with same phase of utility line. Since output of solar cell is greatly fluctuated by insolation, it is necessary that the operation of solar cell output in the range of the vicinity of maximum power point. In this paper, DC/AC converter is three phase PWM converter with smoothing reactor. And then, feedforward control used to obtain a superior characteristic for current control and digital PLL circuit used to detect the phase of utility line.