• Journal of Plant Biology
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• v.19 no.2
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• pp.49-61
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• 1976

A survey was conducted on the vegetation of Judo and Gamagseum in warm temperate zone of Southern Korea. They are covered with natural vegetation, evergreen forest dominated with Castanopsis cuspiadata in Judo and Machilus thunbergii in Gamagseum. Judo is a small island, ca. 1.75 ha, located within the Wando port. Since the flora of Wando including the Judo was reported in 1924, some investigator have reported evergreen trees of Judo. But the list of plant species of Judo is still unavailable. Gamagseum, located at the 15km morth of Judo, is a small island, ca. 1.45 ha, cosisting of two islands, Dae-o-do and So-o-do in low tide, and the report of its flora and any other survery on its is almost none. The vegetatons of Judo and Gamagseum are an example of natural forest vegetation occured rarely in warm temperate zone because of human disturbance in the southern coast zone of the Korean Peninsula. However, the ecological study of those vegetation has not ever been made, and the ecological or plant geographical situations of their vegetation is not clear. To determine the vegetation type, listing of plant species in the islands, calculation of basal area of trees over DBH=4.5cm, Raunkiaer's life form, leaf size class, Pte.-Q and etc., were studied. Total plant species of Judo was 110 species and that of Gamagseum was 99 species. In Judo, Castanopsis cuspidata was 1384 individuals among 2359 individuals over DBH=4.5cm, and in Gamagseum, Machilus thunbergii was remarkably abundant and Castanopsis cuspidata could not be found.

• Journal of Life Science
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• v.14 no.4
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• pp.573-576
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• 2004

The purpose of the present study is to investigate the lipid peroxidation, creatine kinase activity and cortisol hormone levels following the training intensity in elite judo players. Six elite Judo players participated in the experiments (3h repetition judo program), which include stretching, judo skill practice and cool down without recess. Blood sampling were taken at the judo gymnasium at the time of resting, 1h training, 2h training, 3h training, 2h recovery, and 24h recovery time and this were analyzed for CK, MDA and Cortisol levels. The results obtained were analyzed via repeated measures of ANOVA using SPSS package program (ver.10.0) and a value of p<.05 was considered statistically significant. The results from this study were as follows. In the CK levels, which reflect the contribution of creatine phosphate and muscle damage degree, there was a significant difference (p<.05) after judo training in every period. Recovery 24h showed the highest level. In the MDA levels, which reflect lipid peroxidation, there was a significant difference (p<.05) after judo training. Recovery 2h showed the lowest level. In the cortisol hormone levels, which reflect stress status, there was a significant difference (p<.05). In this study, we can conclude that For the trained athletes, MDA level was lower at the time of exercise compare to the other period, this is caused by the increased antioxidant defence mechanism.

• Journal of the Korea Society of Computer and Information
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• v.25 no.10
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• pp.203-209
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• 2020

The purpose of this study is to define how middle school students' motivation of participation in Judo as a recreational sport activity influences their exercise flow and psychological happiness. To achieve that, this researcher conducted a questionnaire survey with middle school students who participated in 2020 National Amateur Judo Event held in Donghae-si, Gangwon-do from Jan. 18 to 20, 2020, for three days. Of the collected questionnaire copies, the questionnaire copies with insincere or insufficient answers were excluded, and 253 copies were used for data analysis. The results of the study are presented as follows: Firstly, middle school students' participation motivation in Judo as a recreational sport activity positively influenced their exercise flow. Secondly, participation motivation in Judo as recreational sport activity positively affected psychological happiness. Thirdly, middle school students' exercise flow to Judo as a recreational sport activity positively influenced their psychological happiness. Therefore, instructors for the recreational sport activity need to develop detailed methods or programs to improve students' personality and leadership beyond Judo skills in order to achieve positive and smooth communication with participants.

• Korean Journal of Computational Design and Engineering
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• v.15 no.5
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• pp.383-392
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• 2010

The purpose of this study is to develop three Judo-doll systems for enhancement of Judo's performance. Traditional Judo training requires a human training partner. Unfortunately it is not always easy to find one. Multifunctional Judo-doll training system has therefore been developed, and is described here. The system consists of a dummy, a power generating mechanism, and kinematic links. The power-generating mechanism generates forces similar to those of a human, by adjusting deadweights and controlling powderbrake's forces. The powderbrake force is controlled by the microprocessor according to the exercise scenario. The kinetic links, which mimic a human training partner's motions, has been developed based on a $Vicon^{TM}$ system's analysis of the movement of human training partners. This mechanism whose name is "L link-wire" consists of L type links, wire, roller, and dead weight. This mechanism generates the force that leads the link to the neutral position regardless the link is pushed or pulled. The lifting mechanism that lifts the doll when the one-armed shoulder throw skill is applied is also developed. A 32-bit microprocessor controls the whole system; it reads the loadcell data, controls the electromagnetic force, and communicates with a PC via Bluetooth. The training history, including loadcell data, date, and training time, is stored in the PC for analysis. This training system can be used to enhance the Judo performance of any self training player.

• Journal of the Korean Applied Science and Technology
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• v.35 no.1
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• pp.55-61
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• 2018

The purpose of this study was to analyze the biomechanical differences of lower extremity joints of the frontal plane during sidestep cutting in male and female Judo athletes. In the knee and hip joint, the female group showed a smaller angle than the male group at the time of IC(initial contact). But peak knee joint adduction moment of female group was greater than male group(p<.05). Therefore, female Judo athletes were more likely to injure their knees at the point where their initial foot contacted the ground than male athletes during sidestep cutting.

• Korean Journal of Applied Biomechanics
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• v.17 no.2
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• pp.197-205
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• 2007

The purpose of this study is to analyze the muscle activations and Ground Reaction Force(GRF) in university judo players, and provide the guide of training in Judo. Using surface electrode electromyography(EMG), we evaluated muscle activity in 5 university judo players during the Judo Uke Movements. Surface electrodes were used to record the level of muscle activity in the Tibialis Anterior, Rectus Femoris, Elector Spinae, Gluteus Maximus, Gastrocnemius muscles during the Uke. These signals were compared with %RVC(Reference voluntary contraction) which was normalized by IEMG(Integrated EMG). The Uke was divided into four phases : Kuzushi-1, Kuzushi-2, Tsukuri, Kake. The results can be summarized as follows: 1. The effective Uke Movements needs to short time in the Kake Phase 2. The Analysis of Electromyography of Uke Movements in Supporting Leg; TA(Tibialis anterior) had Higher %RVC in the Kuzushi Phase, RF(Rectus Femoris) had Higher %RVC in the Tsukuri Phase, GM(Gluteus Maximus) had Higher %RVC in the Kake Phase 3. The ground reaction force for Z(vertical) direction was showed increase tendency in Kuzushi phase, Tsukuri phase and decrease tendency in Kake phase.

• Journal of the Korean Society of Food Culture
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• v.10 no.5
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• pp.449-455
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• 1995

This study was undertaken to investigate dietary status, food habits, and nutritional knowledge of university students majoring in judo (n=239) and to evaluate the effect of dietary behavior on their athletic activities. Mean daily dietary intakes (3,854.0 kcal) were similar to mean daily energy consumptions (3,975.5 kcal). Average daily intakes of most vitamins and minerals were higher than Korean Recommended Dietary Allowances except for the intake of vitamin A. Self-confidence on judo affected dietary behavior of the subjects: Subjects who had more self-confidence on judo showed more interest in good nutrition and concerned more about foods which could promote their athletic activities. Many side effects were manifested after sudden weight control for judo competition during school days. Therefore, it is suggested that good education on nutrition is necessary not only for athletic students, but also for coaches and trainers of the students. Ten weeks of education on nutrition significantly improved both food habits and nutritional knowledge of the subjects. Food habits were positively correlated with self-confidence on judo. Therefore, it is suggested that improvement of food habits through good education on nutrition would be helpful to improve athletic activities of the students.

• Journal of Digital Convergence
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• v.14 no.12
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• pp.545-553
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• 2016

The purpose of this study is finding out the effect of self-confidence and stress on University Judo Athletes performance. For this study, 249 participants of University Judo team athletes were sampled using convenient sampling method. To process data, AMOS 23.0 and SPSS PC+23.0 Version statistical program for WINDOWS were used and frequency analysis, confirmatory factor analysis, reliability, correlations and structural equation model analysis were conducted. Through such processes and method of the study as above, the results of this study are as follows. Firstly, it was discovered that self-confidence had static influence to athletes performance. Secondly, the stress did not affect the athletes performance.

• Journal of International Academy of Physical Therapy Research
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• v.9 no.4
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• pp.1669-1675
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• 2018

The present study aimed to investigate rapid weight loss (RWL) and consequent physical and psychological challenges among judo athletes at the national athlete training center in 2017. The following results were obtained. Judo athletes used weight loss methods such as "gradually reduce meal portion," "skip meals," "limit water intake," "wear sweat suit for training," and "use sauna," and had physical and mental distress from such unhealthy weight management practices. Information about weight loss was obtained from "colleagues or senior athletes," "Internet," and "head coach or coach," and not experts such as nutritionists or physicians. Thus, athletes are recommended to employ healthy weight control methods based on advice from experts, such as nutritionists and physicians.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.12
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• pp.7110-7117
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• 2014

This study examined 149 referees participating in the field of Judo judgment in 2013. 98 referees of the 1st level (65.8%), 18 referees of the 2nd level (12.1%) and 33 international referees (22.1%) were used as the final valid sample. To evaluate the basic background of referees, 7 categories, such as gender, age, Judo, and a referee career, a coaching career, the level of referee, and occupation were examined. In addition, 25 questions in 6 categories, such as misjudgment 4 questions, special consideration 4 questions, claims for judgment 9 questions, physical fitness burden 3 questions, disloyalty at home 3 questions, a lack of conditions 2 questions were tested for the stress of a judo referee. 20 questions in 4 categories, such as peer satisfaction 5 questions, salary satisfaction 5 questions, atmosphere satisfaction 6 questions, and working satisfaction 4 questions, were examined for job satisfaction as a referee in the field of Judo judgment. In particular, the effects of the factors causing stress for a referee and efforts to release the stress are explored. Based on the methods and data mentioned above, the results of this analysis were determined.