태권도 540도 뒤후려차기 동작의 운동역학적 분석

강동권 ( Dong Kwon Kang ),강서정 ( Suh Jung Kang ),유연주 ( Yeon Joo Yu ) 한국운동역학회 2013 한국운동역학회지 Vol.23 No.1

본 연구의 첫 번째 목적은 540° 뒤후려차기 동작의 운동역학적 변인들을 정량화 하는 것이고, 두 번째 목적은 지상동작이 공중동작에 미치는 영향을 밝혀내는 것이다. 지상회전 구간에서의 수직지면반력(GRF)을 분석한 결과 지상에서 180° 회전하면서 나타나는 수직지면반력(GRF)이 체중보다 낮아지는 것을 발견할 수 있었다. 이러한 결과는 반동(counter movement)을 사용하여 높게 점프하려는 전략으로 반동 동작시 발생하는 신장성수축으로 인한 근육과 건에 저장된 탄성에너지를 사용하여 높게 점프하는 SSC(stretch shortening cycle)시스템(Komi, 2003)을 사용하는 것이다. 이렇게 반동을 사용하는 것이 반동을 사용하지 않았을 때보다 높게 점프할 수 있다(Bobbert, Gerritsen, Litjens & Soest, 1996). 즉, 지상에서 회전하는 동안에는 반동 동작을 수행하지 않는 것으로 보이지만 실제로는 반동 동작을 하는 것으로 나타났다. 540° 뒤후려차기에서 각 구간에서 중요하다고 판단되어 정의한 8개의 변인들을 분석한 결과 8개의 변인에서 비슷한 패턴과 적은 표준편차를 나타냈다. 이러한 결과는 11명의 엘리트 시범단원들이 540° 뒤후려차기를 수행하는데 있어서 모두 비슷한 전략을 가지고 있는 것으로 해석할 수 있으며, 이러한 결과는 추후 540° 뒤후려차기를 연구하는 데 유용한 기초자료로 활용 될 수 있을 것이다. 540° 뒤후려차기는 돌개차기와 뒤후려차기가 결합된 복합 기술이다. 즉, 540° 뒤후려차기는 돌개차기로 점프하여 뒤후려차기로 차기기술을 수행한다. Kang과 Kim(1996)은 엘리트 선수의 돌개차기 동작을 연구하였는데, 엘리트 겨루기 선수들의 돌개차기 동작 수행시 지상회전 구간의 소요시간은 0.59±0.06 sec로 나타나 본연구의 지상회전 구간의 소요시간인 0.4±0.04 sec보다 길게 나타났다. 이는 득점을 위하여 빠르게 동작을 수행하는 엘리트 겨루기 선수들보다 540° 뒤후려차기를 전문적으로 수행하는 엘리트 시범단원들이 지상회전 구간에서 더 빠른 지상회전 동작을 수행하는 것으로 사료된다. 540° 뒤후려차기는 차기 구간에서 뒤후려차기를 동작을 수행한다. 이러한 뒤후려차기는 공을 던지는 듯 한 동작의 돌려차기(Throw-like motion)와 미는 형태의 옆차기(Pushlike motion)의 특징이 혼합된 복합운동(Kim, Jin & Shin, 1995; Choi, Lee, Kim & Kim, 2007)으로 복잡한 메커니즘을 가지고 있고, 돌려차기에 비해 뒤후려차기의 발끝 속도는 느리다(Kim, Y. K. & Kim, Y. H., 2010). Ha와 Kim(2009)은 엘리트 시범단원 3명을 대상으로 뒤후려차기의 발끝 속도를 분석한 결과 14.43±2.00 m/sec로 본 연구의 8.78±0.76 m/ses 보다 빠르게 나타났다. 하지만 선행연구는 한발을 지면에 딛고 기술을 수행한 것이고, 본 연구의 뒤 후려차기는 공중에서 수행 했다는 차이점을 가지고 있다. 본 연구의 두 번째 목적인 지상동작이 공중동작에 미치는 영향을 알아보기 위하여 각 구간별 변인들로 상관분석을 실시한 결과 예상하지 못한 결과가 나타났다. 기본적으로 체공시간(FT)과 충격량(impulse)으로 수직점프높이를 추정 할 수 있다(Richter, Rapple, Kurz & Schwameder, 2012; Yuktasir & Kaya, 2009). 따라서 두 변인간의 상관은 높게 나타나는데 본 연구의 결과에서는 체공시간(FT)과 충격량(impulse)에서 상관이 유의하게 나타나지 않았다. 또한 수직신체무게중심(COG)과 충격량(impulse)도 상관관계가 높을 것으로 예상하였으나, 본 연구의 결과 유의한 상관이 나타나지 않았다. 이는 점프동작 이외에 회전동작의 개입으로 인한 결과(Lee & Kim, 1996)로 판단된다. 또한 차기동작인 뒤후려차기를 수행하기 위하여 상체를 숙이는 것에 기인하여 수직신체무게중심(COG)과 충격량(impulse)의 상관이 나타나지 않은 것으로 사료된다. The aim of the study was a quantitative analysis of elite athlete`s 540o Dwihuryeochagi and effects of ground movements to the jumping height and kicking velocity. Eleven elite players(Taekwondo demonstration team) participated in this study. In order to get the kinetic and kinematic variables, ten Vicon cameras and a force plate were used. Foot segment velocity(FSV), vertical ground reaction force(GRF), impulse, ground time(GT) in phase 1, trunk angular velocity(TAV), vertical center of gravity(COG), flight time(FT) in phase 2 and kicking leg segment velocity(KSV) in phase 3 were measured and analyzed. Results indicated that there were similar patterns of variables among phases between subjects. Non-significant correlation(r=.145) between flight time(FT) and impulse was found. Also non-significant correlation(r=.119) between center of gravity(COG) and impulse was found. In conclusions, there were similar strategies in phase 1, phase 2, and phase 3 between subjects.

Hepatic Cirrhosis Occurring in a Young Woodchuck(Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus(WHV)

Kyu-shik Jeong,정원일,Jae-yong Chung,Mi-young An,Chae-yong Jung,Gyoung-jae Lee,Jong-soo Kang,Byeong-cheol Kang,Young-heun Jee,Bruce H Williams,Young-oh Kwon,Da-hee Jeong 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

Cirrhosis Occurring in a Young Woodchuck (Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus (WHV)Da-hee Jeong, Won-il Jeong, Jae-yong Chung, Mi-young An, Chae-yong Jung, Gyoung-jae Lee1, Jong-soo Kang1, Byeong-cheol Kang2, Young-heun Jee3, Bruce H Williams4, Young-oh Kwon5 and Kyu-shik Jeong*College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Korea1Shinwon Scientific Co., LTD, Research Institute, Suwon, Korea2Clinical Research Institute, Seoul National University, Seoul 110-744, Korea3College of Veterinary Medicine, Jeju National University, Jeju 690-756, Korea

Comparative AFLP Profiles among Strains of Korean Races of Xanthomonas oryzae pv. oryzae.

Kang,Mi-Hyung,Lee,Du-Ku,Noh,Tae-Hwan,Shim,Hyeong-Kwon,Na,Seung-Yong,Kim,Jae-Duk 한국자원식물학회 2004 Plant Resources Vol.7 No.1

We used an amplified fragment length polymorphism (AFLP) analysis, a novel PCR-based technique, to differentiate Xanthomonas oryzae pv. oryzae (Xoo) of Korean races. The 6 strains of Xoo K1, K2, K3 races were tested with 81 AFLP primer combinations to identify the best selective primers. The primer combinations were selected according to their reproducibility, number of polymorphic bands and polymorphism detected among Xoo strains. 18 strains of Xoo K1, K2 and K3 races were analyzed with the selected combinations of primer set. Some primer combinations (Eco R I +1 / Mse I+1) could differentiate Xoo of Korean races that were not distinguished by other fingerprinting analysis. Thus AFLP fingerprinting permitted very fine discrimination among different races.

연 X-선 현미경을 이용한 금 나노입자 세포영상

권영만,김한경,김경우,김선희,윤홍화,천권수,강성훈,박성훈,정선관,윤권하 韓國電子顯微鏡學會 2008 Applied microscopy Vol.38 No.3

연 x-선 현미경은 ‘물의 창’ 영역(2.3~4.4 nm)의 파장을 이용하여, 수십 nm의 분해능으로 세포를 파괴하지 않고 살아있는 상태에서 세포의 내부구조를 관찰할 수 있어 가시광선현미경과 전자현미경을 단점을 보완하는 특징을 갖는 세포 생물학 연구에 적합한 현미경이다. 그러나 기존 연 x-선 현미경은 광원으로 방사선 가속기를 이용하기 때문에 사용이 제한적이었다. 이에, 본 연구에서는 2.88 nm의 연 x-선을 광원으로 사용하는 소형 연 x-선 현미경을 이용하여, 내포작용에 의해 금 나노입자를 포획한 HT1080과 MDA-MB 231 세포의 영상을 약 60 nm 분해능으로 획득하였다. 금 나노입자의 세포에 대한 독성을 제거하기 위하여 폴리에틸렌 글리콜을 캡핑하였고, 2.88 nm 파장의 연 x-선에 대하여 충분한 조영효과로 인하여 세포영상에서 뚜렷한 대조도를 나타내었다. 내포작용에 의해 액포에 포함되어 있는 다양한 크기의 금 나노입자 군집을 확인하였으며, 세포내부의 액포의 분포상태도 관찰할 수 있었다. 따라서 고분해능을 가진 소형 연 x-선 현미경을 이용하여 금 나노입자를 세포내의 미세기관이나 특정 단백질에 표지하면 연 x-선에 대한 조영효과의 증가에 의하여 더욱 유용한 정보를 획득할 수 있을 것으로 생각한다. A compact soft x-ray microscope operated in the ‘water window’ wavelength region (2.3~4.4 nm) was used for observing cells with nano-scale spatial resolution. To obtain cellular imaging captured with colloidal gold nanoparticles using a compact soft x-ray microscope. The colloidal gold nanoparticles showed higher contrast and lower transmission more than 7 times than that of cellular protein on the soft x-ray wavelength region. The structure and thickness of the cell membrane of the Coscinodiscus oculoides (diatome) and red blood cells were seen clearly. The gold nanoparticles within the HT1080 and MDA-MB 231 cells were seen clearly on the soft x-ray microscopy. The gold nanoparticles were aggregated within vesicles by endocytosis.

알카리성 부여제 도포에 의한 중성화된 콘크리트의 알카리성 회복성능에 관한 실험적 연구

김무한,권영진,강석표,유재강,이강우 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1

Concrete is the most commonly used material in construction field and it is the permanent construction material with respect to civil property. But, if concrete loses its alkalinity by CO2 gas, it loses its structural characteristics and results in total collapse in construction field. Therefore. it is needed to be studied the alkali-recovery performance by alkalization agent on carbonated concrete by accelerated carbonation test. In this paper, we investigate recovery performance by impregnating alkalization agent in carbonated concrete, then we evaluate alkali maintenance performance by pH survey in each kinds of finishing materials. The results of this paper can be summarized as follows. 1)Carbonated concrete under pH 10 was recovered its alkalinity to pH 11 at first stage by spreading alkalization agent on its outer surface. 2)After spreading alkalization agent, there is a difference due to types of moreover effect of anti-rust paint and ordinary cement paste were excellent.

HMM을 이용한 韓國語 숫자음 認識에 관한 硏究

權榮郁,金一,金康彦,柳志久 釜山工業大學校 1994 論文集 Vol.36 No.-

One of the ultimate purposes in speech recognition is to recognize all of the arbitrary natural-sentences spoken by arbitrary speakers under any noisy environment. This paper describes how HMM is applied to speech recognition and specific parameters are estimated, and vector quantization(VQ) is obtained. Also some experiments of speech recognition are performed for digit that are pronounced four times by twenty Korean adults. The results show that recognition accuracy are 99.7% and 96.0% in closed-test recognition and open-test recognition, respectively.

BCH 부호의 2중 오류정정을 위한 CODEC 설계

강민섭,임권묵 안양대학교 산업기술연구소 2000 自然科學硏究 Vol.7 No.-

본 논문에서는 VHDL을 이용하여 이중 오류정정이 가능한 (31,21)BCH CODEC의 설계에 관하여 기술한다. 제안한 방법은 고속 복호를 수행하기 위해서 오류정정에 사용되는 종래의 순회치환회로와 σ(x)를 구하기 위해 필요한 모든 연산기를 조합논리회로로 재설계하였다. 제안하는 (31,21)CODEC은 VHDL을 이용해 구조적수준 및 행위적 수준으로 모델링하였으며, SYNOPSYS^TM의 VHDL 시뮬레이터상에서 기능레벨 시뮬레이션을 한 결과 단지 1클럭 사이클을 사용해서 r(x)로부터 c(x)를 구할 수 있음을 확인하였다. 논리합성은 SYNOPSYS^TM CAD툴에서 삼성 SOG 셀 라이브러리를 이용하여 수행하였다. Altera^TM MAXFLUSⅡ 타이밀 시뮬레이터 상에서 수행한 시뮬레이션 결과로부터 설계된 CODEC이 정확히 동작함을 확인하였다. 합성 결과, 부호기의 총 게이트 수는 299개이며 복호기는 1600개이다.

사과 열과(裂果)의 원인과 그 방지에 관한 연구

권병규,강영호,이우승,성민웅,한강원 경북대학교 1971 生産技術 Vol.5 No.-

On the basis of our hypothesis about the causes of cracking has obtained in our 1969's study, we investigated the relations among the cracking and the microelements, the environmental factors, and the treatment of IAA and GA in two selected orchards. We analyzed and compared with the contents of microelements (Mn, B, zn, and Cu) in leaves and soils of two test orchards (Taegu and Yungju). The results of the study which the causes of cracking of apples are examined through the above three procedures, are as follows: 1. The contents of Mn in soil of Taegu test orchard were total Mn 435.9 ppm, soil sol'n Mn 6.2ppm, and total Mn 284.6 pm in leaves. That of Yungju test orchard were total Mn 595.1ppm, soil sol'n Mn 6.2ppm and total Mn 144.2ppm in leaves. Comparing with Mn optimum contents in leaves Mn contents of Taegu test orchard were higher than the optimum concentration, while those of Yungju were approximately satis-factory. 2. The contents of B in leaves were 3.7ppm in Taegu and 4.6ppm in Yungju. These contents were lower ten times than the optimum contents and were the same deficiency in both test orchards. 3. The contents of Zn in leaves were 5.7ppm in Taegu and 3.8ppm in Yungju. Those contents were both the same deficiency as comparing with the optimum contents. 4. The contents of Cu in leaves were 29.3ppm in Taegu test orchard and 10.6ppm in Yungju test orchard. Comparing with the optimum contents, the contents of Cu were excess in Taegu test orchard, while that of Cu were approximately satisfactory in Yungju 5. The diameter of Ralls apple fruits were increased 1.1% in IAA spraying treatment and 3.1% in GA spraying treatment as comparing with control group 6. The thickness of cuticle layer of Ralls apple fruits were highest and the cuticle treated with IAA and GA was thinner than the control group. 7. New branches of tree with higher cracking rate tended to decrease in length, in figure and size of leaves. 8. The change of diameter in fruits were decreased in higher cracking fruits during day and night. The change of that in IAA and GA group were increased 6.1% and 1.2% respectively compared with the control group. 9. The application of IAA and GA solution slowed the cracking rate by 2.2 and 0.8% respectively compared with the control group 10. In 1970 year the cracking rate of Ralls apple fruit were 6.53% in Taegu and 4.31% in Yungju test orchard. 11. We obtained linear regression of rate of cracking and the summation of temperature during May to August in Taegu area. The summation of temperature was 2428.1℃ during June to August in 1970. When the summation of temperature was increased more than above that of tempera ture, we could expect that it was possible to increase the rate of cracking Ralls apple. An equation in the summation of temperature and the rate of cracking fruits during May to August were obtained y=0.074x-157.50. 12. The investigation indicates that a method of preventing the cracking of Ralls apple is: a. to spray at the optimum time growth hormone which increases the elasticity and elongation of cell wall. b. to alter the composition of soil by putting the organic fertilizer deeply in the ground. c. to replace Ralls apples with new varieties which is strong against cracking and have high quality and economical productivity.

21C 신지식인 양성을 위한 Eng@internet 교육프로그램

강병우,조권수,이기정,이강노,홍남희 광주보건대학 2000 論文集 Vol.25 No.-

This study is an educational program chiefly designed for teaching all the students in Kwang-ju Health College English and internet at the same time, which was applied for the fourth field of a specializing program required by the Ministry of Education. The program is a knowledge enhancement one aimed at training men and women who will become the leaders with advanced knowledge for the 21st century. The International Education Cooperation Center established in the College will manage and supervise all the procedures, especially in developing curriculums and in training the students. There are three kinds of detailed courses in this program; the basic, the applied, and the one for qualifications. 1. The basic course, a grounding one for cultivating the men and women with advanced knowledge, consists of the education for practical use of a computer, internet English, and netiquette. This is a required course for the applied one, and the president in the college gives certification to the students who complete this course satisfactorily. 2. In the applied courses, there is the E-mail penpal--one that offers each student the opportunity to communicate with a native speaker, and the subject discussion course in which the students are able to exchange their ideas or thoughts at a time with multi-people with the same or similar interests or majors. The former is a required one for the latter. The students who complete this course satisfactorily the certified by the president at the college. 3. This course for the diversification of the student employment after graduation is classified into the six classes for the qualifications; the 1st and the 2nd grade data referer(or processor) throuhg internet, the specialized intelligence processor, the tourist guide, the 3rd grade English translater, and the simultaneous English interpretor. This course must be taken by the students who complete or are in the E-mail penpal or subject discussion course. To gain this, the programs offer various learning motivations; English speech, TOEIC, and English data referring contests, international exchange program, and so on. This program is expected to improve all the education at the college, especially curriculums and teaching methods, and have a mulitplier effect on various fields for other colleges, communities, and industries.

라이시안 페이딩 환경하에서 이동위성 통신채널상에서 도플러 효과에 의한 DS/CDMA-PSK 신호의 오율성능

강희조,이권현 동신대학교 환경연구소 1997 환경연구 Vol.2 No.1

본 논문에서는 육상 이동 통신채널과 저궤도 (LEO : Low Earth Orbit) 이동위성통신에 적용할 수 있는 라이시안 페이딩 환경에서 도플러 위상에러와 다중접속 간섭이 동시에 부가될 경우 DS/CDMA-PSK신호의 성능 분석을 하였다. 성능평가는 신호전력 대 잡음전력비(SNR), 도플러위상에러(dp), 라이시안 페이딩 지수(K), 다중접속 사용자 간섭수(U), 그리고 확산 코드길이(N)에 따른 분석을 한다. 성능 분석 결과 라이시안 페이딩 지수와 화산 코드의 길이가 증가함에 따라 성능이 좋으며, 도플러 위상 에러와 다중접속 사용자수가 증가하면 성능이 열화 됨을 알 수 있었다. In this paper, It was studied on the performance of DS/CDMA-PSK signal over land mobile satellite communication channel. The analysis model selected communication using a low earth orbit mobile satellite. The Doppler phase error due to the relative velocity between the earth station and a satellite in communications using a low earth orbit mobile satellite is detected. As for the doppler phase error and the direct wave to reflex wave ratio and the MAI(Multi Access Interference) user number and the PN code length, the performance of DS/CDMA-PSK signal in the presence of the Rician fading channel environment with the Doppler phase error and noise was compared with the error performance.