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이종훈,이상돈,Lee, Chong-Hun,Rhee, Sang-Don 대한생리학회 1969 대한생리학회지 Vol.3 No.1
Tissue homogenates of 10 kinds of human cancer tissues were incubated in medium containing either one of $C^{14}-1,\; C^{14}-2,\;or\; C^{14}-3-lactate $ as a substrate in order to observe the oxidative pathway of lactate in cancer tissues. Lactate concentration in incubation medium was maintained at 50 mg%. At the end of incubation period, gas samples and incubation media were analyzed for total $CO_2$ production rates, radioactivities of respiratory $CO_2$, lactate uptake rates and pyruvate appearance rates. The following results were obtained. 1. Lactate uptake rates in all of cancer tissues examined were less than $2.5\;{\mu}M/hr/gm$ and much lower than those in normal tissues. 2. In the 10 kind of human cancer tissues, total $CO_2$ production rates were less than $10\;{\mu}M/hr/gm$, in all cases. These lower values impressed that oxidative metabolism in tumor tissues generally inhibited as compared with that in normal tissue. On the other hand, fractions of $CO_2$ derived from lactate to total $CO_2$ production rates were less than 15% except one case These facts showed that oxidation of lactate into $CO_2$ was greatly inhibited in tumor tissues. 3. Respiratory $CO_2$ yields from C-1 carbon of lactate in various cancer tissues were mean of 77.7% of total $CO_2$ yield from lactate and $CO_2$ yields from C-2 and C-3 carbon of lactate were mean of 9.1% and 12.6% respectively. These facts showed that carboxyl carbon of lactate oxidized more easily than ${\alpha}\;and\;{\beta}$ carbon of lactate. 4. In 10 kinds of cancer tissues, fractions of disappeared lacteate from media into $CO_2$ and pyruvate, which expressed as RLD $co_2$ and RLDpy respectively, were about 5% in except 3 cases and less than 3% except one case. These fact showed that almost of disappeared lactate from media were degraded into compounds other than $CO_2$ and pyruvate. From the above date, it was suggested that in the oxidative pathway of lactate in cancer tissues $CO_2$ was easily Produced from carboxyl carbon of lactate by oxidative decarboxylation as in the normal tissue, and further oxidation of 2 carbon unit via TCA cycle was inhibited.
남ㆍ여 탁구선수의 백핸드 파워 드라이브동작에 대한 운동학적 분석
이용식(Lee Young-Sik),이종훈(Lee Chong-Hun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.4
The purpose of this study was to analyze kinematic quantitative factors required to Backhand power drive in table tennis through 3-D analysis. Four national table tennis players participated in this study. The results of the study were as follows. 1) COM(Center of mass) of subject moved to forward after back swing. It allows more power and spin to the ball during impact. Low COM during back swing is considered to increase stability and allow greater accuracy. 2) Elapsed time for each phase uses reaction force of opponent’s ball. Effective back swing needs to be short and simple. 3) Resultant velocity of racket-head was the fastest at impact, it generates a greater impulse allowing more speed and spin of the ball. 4) Right knee joint angle stayed low from address to back swing position. With the beginning of forwarding movement, knee joint angle started to increase. It becomes upright posture at impact and COM shifted to the forward leg. To propel body into forward and up position, knee angle kept increasing.
신체충실지수와 체력요인의 상관에 관한 연구 : 서울시내 남자 중학생을 중심으로
이종훈 師範大學 體育硏究所 1990 서울大學校 體育硏究所論集 Vol.11 No.2
The purpose of this study was to examine the validity of the Rohrer Index which was being used in a school. The subjects participated in this study were 534 middle school boys in Seoul. The score of physical fitness factors(1,000m run, 100m run, and standing broad jump) of a physical examination which was executed in 1989 was collected. The analysis of data was conducted to Pearson’s r, multiple R. The data was analyzed by using the subprograms(correlation, regression) of the SPSS/PC+. The results were as follows. The validity of Rohrer Index as index of physique is high, but the validity of the Rohrer Index as a index of physical fitness is low.