노르딕워킹의 속도에 따른 하지 관절의 운동역학적인 분석

양대중 ( Dae Jung Yang ),이용선 ( Yong Seon Lee ),박승규 ( Seung Kyu Park ),강정일 ( Jeong Il Kang ),이준희 ( Joon Hee Lee ),강양훈 ( Yang Hoon Kang ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.3

In this study, 26 normal subjects were studied to compare the biomechanical Analysis of Lower Limbs on Speed of Nordic Walking. The biomechanical variables were determined by performing three-dimensional gait analysis, and the measurements items were spatial and temporal parameters; vertical ground reaction force; and moments of the hip, knee, and ankle joints. The purpose of this study based on the speed of Nordic Walking to the vertical ground reaction force and joint moments of each were analyzed. Nordic Walking with poles while being whether this weight is reduced to load, not the improvement of muscle activity by identify Nordic walking is to allow efficient. The results of the analysis were follows. The spatial parameters of step length, stride length significantly increased with increase in velocity(p<0.001). The temporal parameters of step time, stride time, the duration of double support use, and the duration of single support use also significantly decreased with increase in velocity(p<0.001), but cadence significantly increased(p<0.01). Analysis of the changes in ground reaction force revealed that vertical ground reaction force significantly increased at the initial contact and the terminal stance and decreased at the mid stance with increase in velocity(p<0.001). Moments of the hip and knee joints significantly in creased with increase in velocity whereas that of the ankle joint did not. Gait analysis revealed that weight-bearing decreased and moments of the hip and knee joints increased with increase in velocity(p<0.01). The results of this study may help people perform Nordic walking efficiently and Nordic walking can be used in the gait training of people with an abnormal gait.

초고압 GCB용 Al 알루미늄 주물탱크 개발

양대일(Yang Dae Il),한동영(Han Dong Young),서경보(Seo Kyoung Bo),김정배(Kim Jung Bae),송원표(Song Won Pyo) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

컴퓨터화된 자세조절훈련이 뇌졸중 환자의 균형 및 근활성도에 미치는 영향

양대중,박승규,강전일,이준희,엄요한,Yang, Dae-Jung,Park, Seung-Kyu,Kang, Jun-Il,Lee, Jun-Hee,Uhm, Yo-Han 대한물리치료학회 2012 대한물리치료학회지 Vol.24 No.5

Purpose: This study examined the effects of computerized feedback postural training on the balance and electromyography activity of subjects with stroke. Methods: A total of 30 chronic stroke patients were enrolled in this study. Subjects were divided into an experimental group (n=15) and a control group (n=15). Computerized feedback postural training was used in the experimental group. Both groups received intervention for six weeks, 5 times per 30 minutes period. Data analysis was performed using analysis of covariance for determination of statistical significance. Results: Significant difference in static and dynamic balance was observed in the experimental group, compared with the control group (p=0.05), and a significant difference in muscle activity was observed in the gastrocnemius muscle, quadriceps muscle, and elector spinae muscle. However, the hamstring muscle showed no significant difference. Conclusion: Computerized feedback postural training is more effective in improving the ability of balance and muscle activity than neurological physical therapy.

저온에서 녹기연장의 한국잔디 ‘한라그린 7’ 품종 개발

양대화(Dae-Hwa Yang),선현진(Hyeon-Jin Sun),정옥철(Ok-Cheol Jeong),강홍규(Hong-Gyu Kang),송인자(In-Ja Song),진일두(Il-Doo Jin),강시용(Si-Yong Kang),이효연(Hyo-Yeon Lee) 한국육종학회 2021 한국육종학회지 Vol.53 No.4

The ‘Halla Green 7’ cultivar is a hybrid of Zoysia matrella and Zoysia japonica. The inflorescences of Z. matrella lines werecollected from Jeju Island near the border between Z. matrella and Z. japonica wild plants, respectively. After their harvest, the seeds weresown and various interspecific lines were obtained. In 2021, a line with greening period extending phenotype during the low temperaturesof winter was registered under the cultivar name of ‘Halla Green 7’ (Registration No. 245). The main morphological characteristics of the‘Halla Green 7’ variety are as follows: genetically short length of plant (12.2±0.58 cm), very wide angle of leaf (68.6°), short length ofleaf blade (8.38±0.37 cm), medium-leaf (3.29±0.09 mm), and very low leaf sheath (2.18±0.19 cm). The short length of leaf sheath makesit easy to manage the turf grass with low height. A very wide leaf angle has a high photosynthetic efficiency. The ‘Halla Green 7’ cultivaris morphologically classified as Z. matrella × Z. japonica hybrid line by medium-width of leaf blade and the presence of trichomes on theleaf surface. The colors of the leaf blade, leaf sheath, and stolon are green, light green, and light purple, respectively. During the low temperatureperiod of winter, chlorophyll content of the leaves of ‘Halla Green 7’ shows a 10.1-fold from that of the control Z. japonia ‘Yaji’ and about4.2-fold from that of the control Z. matrella Zm-6. This greening period extending phenotype is expected to contribute to the industrializationof zoysiagrass (Registration No. 245).

OBD 규제 대응 위한 촉매 열화법 개선 연구

양대성(Dae-Sung Yang),송영일(Young-Il Song),송진우(Jin-Woo Song),강희천(Hee-Chun Kang) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

편마비 환자의 반 무릎서기 자세가 일어서기 동작 수행에 미치는 영향

양대중,장일용,박승규,이준희,강정일,천동환,Yang, Dae-Jung,Jang, Il-Yong,Park, Seung-Kyu,Lee, Jun-Hee,Kang, Jung-Il,Chun, Dong-Hwan 대한물리치료학회 2011 대한물리치료학회지 Vol.23 No.5

Purpose: The purpose of this study was to investigate the kinematic characteristics and muscle activities during the following two conditions: transition from half-kneel to standing on the affected leg and non-affected leg. Methods: Twenty-one hemiplegic patients participated in the study. A motion analysis system was used to record the range of motion and angle velocity of the hip, knee and ankle from the half-kneel to the standing position. Electromyography was used to record the activity of 4 muscles. Results: The statistical analysis showed that the minimum ROM of the hip joint was less on the affected leg during transition from half-kneel to standing. However, the minimum ROM of the knee and ankle joints was less on the non-affected leg during transition from half-kneel to standing. The angle velocity of the knee and ankle joints was less during transition from half kneeling to standing on the non-affected leg. Muscle activity of the rectus femoris and tibialis anterior was less while moving from half-kneel to the standing position on the affected leg. Conclusion: These results show that greater active ROM of the knee and ankle was required on the affected leg for transition from half-kneel to the standing position than for normal gait. Muscle activity of the rectus femoris and tibialis anterior is normally required for movement from the half-kneel to the standing position during normal gait. Further studies are needed to investigate the antigravity movement in healthy subjects and hemiplegic patients in order to completely understand the normal and abnormal movement from the half-kneel to the standing position.

신경근 훈련이 기능적 발목 불안정성 축구선수의 자세조절과 점프 수행력에 미치는 영향

양대중 ( Dae Jung Yang ),강정일 ( Jeong Il Kang ),박승규 ( Seung Kyu Park ),이민기 ( Min Ki Lee ),정용식 ( Yong Sik Jeong ) 한국운동역학회 2014 한국운동역학회지 Vol.24 No.3

The purpose of this study was to investigate the effects on jump performance and balance in soccer player with functional ankle instability of difference of neuromuscular training. In 33 male college soccer player with functional ankle instability subjects of this study randomization, combined training group (group I, n=11) , balance training group (group II, n=11) and control group (group III, n=11) that included in the plyometric training and balance training was classified group. The intervention was conducted three times a week for 8 weeks. Before and after intervention, measured in surface area ellipse and countermovement jump and countermovement jump with arm swing. Showed a significant improvement in postural control and jump performance from the combined training group and balance training group compared to the control group. Showed a significant improvement in countermovement jump from the combined training group compared to the balance training group. Combined training and balance training showed the increased jump performance and postural control in soccer player with functional ankle instability.

한국잔디 ‘한라그린 10’ 품종의 개발

양대화(Dae-Hwa Yang),정옥철(Ok-Cheol Jeong),선현진(Hyeon-Jin Sun),강홍규(Hong-Gyu Kang),진일두(Il-Doo Jin),이효연(Hyo-Yeon Lee) 한국육종학회 2021 한국육종학회지 Vol.53 No.4

This superior zoysiagrass line was selected from the zoysiagrass genetic resources collected in the Republic of Korea. Inflorescencesof Zoysia matrella lines were collected near the border between wild Zoysia japonica and wild Z. matrella on Jeju Island. Various Z. matrella× Z. japonica lines were obtained using the seeds from the collected inflorescences. In 2021, one of the lines that extended the greeningperiod during the low temperatures of winter was registered under the name of ‘Halla Green 10’. The main morphological characteristicsof this cultivar, which were analyzed using the test guidelines of the Korea Forest Service, are as follows: short length of plant (12.01±0.57cm), short length of leaf blade (8.83±0.68 cm), and short length of leaf sheath (1.71±0.20 cm). The short length of leaf sheath makes iteasy to manage the turf grass with low height. Due to the presence of trichomes on the leaf surface and medium-leaf type (leaf blade width:3.0±0.16 mm), ‘Halla Green 10’ is morphologically classified as Z. matrella × Z. japonica. As the leaf angle is very wide at 77.7°, it hasa high photosynthetic efficiency. The colors of the leaf sheath, leaf blade, and stolon are light green, green, and light purple, respectively. In particular, during the low temperature period of winter, the chlorophyll content of the leaves of ‘Halla Green 10’ shows about 7.5-foldfrom that of the control Z. japonia ‘Yaji’ and about 3.2-fold increase from that of the control Zm-6. Extending the greening period phenotypeis expected to be commercially useful (Registration No. 246).

뇌졸중 환자에서 자세정렬변화가 족저압 및 균형에 미치는 영향

양대중,박승규,강정일,박성빈,Yang, Dae-Jung,Park, Seung-Kyu,Kang, Jeong-Il,Park, Seong-Bin 대한물리치료학회 2014 대한물리치료학회지 Vol.26 No.4

Purpose: This study was conducted in order to investigate the exercise limit that may occur depending on changes in postural alignment by examining the significance of postural alignment changes, foot pressure, and balance of patients with stroke. Methods: In this study, 50 patients diagnosed with a stroke were selected as subjects. Imbalance of postural alignment of the trunk, pelvic tilt of trunk rotation of the body, angle of kyphotic curving of the thoracic, and angle of lordotic curving of the lumbar vertebra were measured. Foot pressure was examined by measuring average pressure and weight bearing. Balance was examined by measuring the center of pressure and limit of stability. Results: The significance of postural alignment, foot pressure, and weight bearing of the non-paretic side was examined. In addition, the significance between postural alignment and balance was examined. Conclusion: It is thought that limits of foot pressure and balance in the standing position can be caused by postural alignment. Thus, both a therapeutic intervention program and postural alignment training should be provided together in order to improve the function of patients with stroke.

뇌졸중 환자의 누운 자세에서 앉기 동작의 생체 역학적 분석

박승규,양대중,강정일,이준희,윤종혁,Park, Seung-Kyu,Yang, Dae-Jung,Kang, Jung-Il,Lee, Jun-Hee,Yoon, Jong-Hyeouk 대한물리치료학회 2013 대한물리치료학회지 Vol.25 No.2

Purpose: This study was conducted in order to suggest an effective method of daily life movement training for stroke patients by comparison and analysis of the biomechanic characteristics of sitting up from a lying posture in stroke patients and healthy elderly participants. Methods: Fifteen stroke patients and 15 age-matched elderly participants were included in the study. The movement of sitting up from a lying posture was divided into three stages, and the differences in muscle activity in the sternocleidomastoid (SCM), rectus abdominis (RA), external oblique (EO), and rectus femoris (RF) during the movement were analyzed. Results: Subjects in the experimental group showed slower speed than those in the control group. In the neck joint, the change of angle in movement showed a larger decrease at all stages in the experimental group than in the control group; the movement also decreased in stages I and II in the upper trunk joint. The movement also showed a statistically significant decrease in stage II in the lower trunk, pelvic, and hip joints. The SCM showed higher activity in the control group than in the experimental group, showing a statistically significant difference; the RA showed high activity in the experimental group. The RF showed higher activity in the control group than in the experimental group, showing a statistically significant difference. Conclusion: From the results obtained above, increasing movements in the neck, pelvic, and hip joints and strengthening of lower body muscles are required in order to improve the ability for getting up from a lying posture in stroke patients.