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Tensiomyography를 이용한 볼링 선수의 하지 근 수축 특성 분석
박정관(Park, Jeong-Kwan),이희종(Lee, Hee-Jong),박희근(Park, Hee-Geun) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.1
The purpose of this study was to analyse the contractile properties of lower extremity muscles in collegiate bowling players using tensiomyography(TMG). Fourteen male bowling players was divided into 2 groups: ELT(excellent muscular function group, n=7), NELT(non-excellent muscular function group, n=7). TMG was recorded from the biceps femoris(BF), semitendinosus(ST), vastus medialis(VM), vastus lateralis(VL), rectus femoris(RF). The TMG parameters obtained for each muscle were maximal displacement(Dm), contraction time(Tc), contraction velocity(Vc), delay time(Td), half-relaxation time(Tr), sustained time(Ts). The result of this study were as follows: Dm in ELT group was significantly lower than NELT group on BF and ST muscle(p<.05). TC and Vc in ELT group was significantly lower than NELT group on BF muscle(p<.05). In this results may provide important information for lower extremity training and injury prevention program designing for collegiate bowling players.
Proper Tree Vigor and Crop Load in High Density Planting System for 'Fuji'/M.9 Apple Trees
Moo-Yong Park(박무용),Jeong-Kwan Park(박정관),Sang-Jin Yang(양상진),Hyun-Hee Han(한현희),In-Kyu Kang(강인규),Jae Kyun Byun(변재균) (사)한국생물환경조절학회 2008 생물환경조절학회지 Vol.17 No.4
본 연구는 2001년부터 2003년까지 '후지'/M.9가 재식된 밀식사과원에서 적정 수세와 적정 착과량을 조사하였다. 엽과비는 평균 과중(y=1.715x+205.02, R²=0.66)과 수량(y=-35.156x+5963.7, R²=0.44)에서 고도로 유의한 상관이 있는 것으로 나타났고, 주당엽수와 평균 과중 또한 상관이 있었다. 그러나 착과량에 따른 수체생육, 과실품질 요인중 당도 및 착색도에서는 처리간 차이가 없었다. 격년결실이 발생하지 않으면서 300g 이상의 과실을 생산하는 기준은 엽과비는 55 수준에서 착과량이 주당 약 55~64개의 수준이 적합하였다. '후지'M.9 밀식재배시 성목기의 안정된 수세 기준은 평균 신초장이 20~25㎝, 신초 정지율이 95% 이상 수준을 보여야 되는 것으로 판단되며, 보다 세부적으로는 2차 생장이 거의 발생되지 않으며 과대지 비율은 적어도 20~30% 정도 되어야 할 것으로 판단되었다. Proper tree vigor and crop load were determined for 'Fuji'/M.9 apple trees in high density planting system from 2001 to 2003. Leaf/fruit ratio was highly correlated to mean fruit weight (y = l.715x+205.02, R²=0.66) and yield (y=-35.156x+5963.7, R²=0.4). In addition, there was a significant correlation between the number of leaves per tree and mean fruit weight. However, crop load did not affect tree growth, soluble solids content of fruit, and Hunter a value. To harvest the fruits heavier than 300 g without biennial bearing, it was appropriate to crop 55 to 64 fruits in a tree with 55 leaves per fruit of adult tree. The good indices for proper tree vigor could be 20 to 25 ㎝ of mean shoot length and above 95% of shoot termination rate. Moreover, no secondary growth and 20 to 30% of spur formation could be the indices for highly productive tree vigor.
포도 ‘캠벨얼리’의 웨이크만과 개량일자형 수형에서의 노동력과 생장특성 비교
박서준(Seo-Jun Park),조은경(Eun-Kyung Cho),김수진(Su-Jin Kim),허윤영(Youn-Young Hur),남종철(Jong-Chul Nam),황해성(Hae-Sung Hwang),박정관(Jeong-Kwan Park),정성민(Sung-Min Jung) (사)한국생물환경조절학회 2016 생물환경조절학회지 Vol.25 No.3
개량일자형 수형과 웨이크만식 수형은 우리나라에서 가장 널리 사용되는 수형으로 ‘캠벨얼리’와 같은 단초전정형 품종에 장점을 가지고 있다. 본 시험에서는 웨이크만식 수형과 개량일자형 수형에서의 노동시간과 노동강도를 비교하였다. 그 결과, 송이다듬기는 웨이크만식 수형에서 17.3 시간/10a, 개량일자형 수형에서 12.3/10a 시간이 소요되었다. 봉지씌우기는 웨이크만식 수형에서 10.1 시간/10a, 개량일자형 수형에서 8.2 시간/10a가 소요되었다. REBA index를 이용하여 송이다듬기와 봉지씌우기의 노동강도를 확인한 결과 웨이크만식 수형에서 13점, 개량일자형 수형에서 8.6점을 나타내었다. 한편, 개량일자형 수형에서는 포도나무 신초들의 절간장과 절간굵기의 강한 생장도 감소하였다. 결과적으로 개량일자형 수형은 우리나라의 포도과원 생력화에 더욱 편리한 수형이다. Modified T trellis (MT) and Wakeman trellis (WT) were widely used Korean vineyard because they had an advantage for spur pruning type cultivar such as Campbell Early. In this experiment, we compared labor time and intensity for bunch management between MT and WT trellis systems in ‘Campbell Early’ grapes. As a result, berry thinning was required 17.3 hours (10a) on the WT trellis but was required 12.3 hours (10a) on the MT trellis. In like manner, bagging was required 10.1 hours (10a) on the WT trellis but was required 8.2 hours (10a) on the MT trellis. On the other hand, labor intensity measured on berry thinning and bagging practices using REBA (Rapid Entire Body Assessment) index, then WT trellis was scored 13.0, but MT trellis was scored 8.6. Meanwhile, MT trellis reduced vigorous growing of internodes length and width on grapevine shoots. Consequently, MT trellis is more convenience trellis for working ergonomically in Korea vineyard.
남원군 산내면 일대에 분포하는 편마암류의 미량성분에 의한 그 기원암에 관한 연구
박정관,조규성,남기상 全北大學校 基礎科學硏究所 1989 基礎科學 Vol.12 No.1
This research aims to study origin by trace elements (Cu, Cr Pb, Ni, Mn, Li,Zn) of 225 samples of the gneisses that receive high metamorphism in sannae-myeon area, Namwon-gun. I have studied average abundance, abundance range and frequency distribution of each elements, and considered geochemical feature of the trace elements in the shale and granite. Abundance of Cu, Cr, Ni, in the shale of sedimentary origin is higher than that in the granite of igneous origin. Abundance of the trace elements in the porphyroblastic gneiss, granitic gneiss and pegmatitic gneiss is very similar to the that in the shale with the biotite gneiss, but that in the leucocratic gneiss is less than in the shale and it is similar to the granite. Frequency distribution of the rocks of sedimentary origin is irregularly widely dispersion, but that of igneous origin is distributed narrowly around maximum frequency. Therefore the porphyroblastic gneiss, granitic gneiss and pegmatitic gneiss is paragneiss with the biotite gneiss, and the Leucocratic gneiss is orthogneiss. This result is in accord with geological field survey and study on the metamorphism(Kim O.J. etal.,1964;Kim H.S., 1970,1973; Lee S.M., 1980,1981)
남원 지역에 분포하는 화강암류와 풍화토양의 화학성분 변화에 관한 연구
조규성,박정관 全北大學校 科學敎育硏究所 1999 과학과 과학교육 논문지 Vol.24 No.-
This study aims at clarifying the variation of chemical composition according to weathering of granitic rocks in the Namwon area. The results are obtained from the analysis and examination of chemical composition of the basement and weathered rocks. The abundance of Na_2O and FeO decreased according to weathering of rocks from the Harker variation diagram. As weathering proceeds, the ratio of K_2O/Na_2O, Al_2O_3/CaO, SiO_2/Na_2O shows increasing but that of FeO/Fe_2O_3, (Na_2O+K_2O/Al_2O_3 decreasing. The chemical weathering potential index of me granitic rocks is small. The reason is that the granite is strong on the chemical weathering.