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RISS 인기검색어
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- 저자 : 강정일(Jeong Il Kang) (검색결과 116 건)
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새로운 위상전이 병렬입력/직렬출력 모듈화를 적용한 듀얼 컨버터
강정일(Jeong-il Kang),노정욱(Chung-wook Roh),한상규(Sang-Kyoo Han),윤명중(Myung-Joong Youn) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A new phase shift PWM parallel-input/series-output modularized dual converter is proposed in this paper, This converter is operated with a fixed duty ratio and its output voltage is regulated by phase shift between each module, Since the operating duty ratio of each module is fixed, it is sufficient to implement a simple open loop drive circuitry for each module and the cost of total system can be much reduced, The operation of the converter is analyzed in this paper and verified by computer simulation
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전신 진동 운동을 병행한 스쿼트 운동이 무릎넙다리 통증 증후군 환자의 넙다리네갈래근의 근 활성도 및 피로도에 미치는 영향
강정일 ( Jeong-il Kang ),문영준 ( Young-jun Moon ),정대근 ( Dae-keun Jeong ) 대한물리의학회 2021 대한물리의학회지 Vol.16 No.1
PURPOSE: The purpose of this study was to provide fundamental clinical data to be used in therapeutic approach to patients with patellofemoral pain syndrome by administrating the squat exercise combined with whole body vibration exercise to them and investigating the effect of such exercise to leg muscle activity and muscle fatigue. METHODS: The patients with patellofemoral pain syndrome were randomly assigned to experimental group I (n = 9) where only squat exercise was administered and experimental group II (n = 9) where the squat exercise combined with whole body vibration exercise was provided. The intervention program was administered for two weeks, four days a week, one session a day, three set a session, and 20 reps a set. The pre- and post-test were performed to measure muscle activity and muscle fatigue of vastus medialis and vastus lateralis. RESULTS: The muscle activity significantly changed in both group (p < .05, p < .01, respectively) and the muscle fatigue showed significant change only in group I (p < .05). In addition, there was significant difference between groups in change of muscle fatigue of both muscles (p < .05) but not in change of muscle activity. CONCLUSION: The results showed that both exercise are effective in improving muscle activity, however, that the squat exercise combined with whole body vibration exercise is more effective in preventing muscle fatigue.
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자가 신장운동이 전방머리자세를 동반한 만성 목통증 환자의 자세개선에 미치는 영향
강정일 ( Jeong-il Kang ),정대근 ( Dae-keun Jeong ),박승규 ( Seung-kyu Park ),양대중 ( Dae-jung Yang ),김제호 ( Je-ho Kim ),문영준 ( Young-jun Moon ),백승윤 ( Seung-yun Baek ) 대한물리의학회 2020 대한물리의학회지 Vol.15 No.3
PURPOSE: The purpose of this study was to provide clinical basic data to reduce pain and improve function by comparing neck muscle activity and neck alignment using self-stretching and passive stretching exercises for chronic neck pain caused by forward head posture. METHODS: The subjects were divided into 15 subjects assigned to perform self-stretching exercise and 15 subjects assigned to perform passive stretching exercise. The intervention was conducted for a total of 4 weeks. The muscle activity in the neck was measured by surface electromyography (EMG) before intervention, and craniovertebral and cranial rotation angles were measured by X-ray. The 4-week intervention was conducted and the above items re-measured in the same manner and analyzed. RESULTS: Muscle activity within both groups after intervention using self-stretching or passive stretching exercise was significantly different (p < .05)(p < .01). Neck alignment of both groups was significantly different (p < .001)(p < .01). Further, muscle activities of the upper trapezius and splenius capitis muscles showed significant differences (p<.05). Lastly, neck alignment showed statistically significant difference (p < .05). CONCLUSION: Self-stretching exercise activated motor nerves as a posture correction exercise, thereby improving inhibition of muscle activity, muscle contraction delay, and pathological conditions of the muscle. For future research, interventions of self-stretching exercise will be needed for patients with chronic back pain accompanied by forward head posture, and various clinical studies on postural improvement of forward head posture by maintaining a normal muscle tone state are needed.
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깊은 목굽힘 강화운동이 만성뇌졸중 환자의 폐기능과 호흡근활성도에 미치는 영향
강정일(Jeong-il Kang),정대근(Dae-Keun Jeong) 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.9
본 연구는 뇌졸중 환자에게 깊은 목 굽힘 강화운동을 중재하여 호흡근의 변화와 예후 및 폐기능 정도를 파악함으로써 호흡의 기능향상을 위한 임상적 중재방법 설정에 대한 임상적 기초자료를 제시하고자 한다. 실험 전 호흡근 운동을 중재한 9명을 대조군으로 호흡근 운동을 병행하여 깊은 목굽힘 강화운동을 중재한 11명을 실험군으로 중재 전 폐활량측정기를 이용하여 폐기능을 알아보고 호흡보조근 활성도를 알아보기 위하여 표면근전도를 측정한 후 이들의 항목을 동일하게 재측정하여 비교 분석하였다. 실험결과 대조군 집단 내 변화비교에서는 FEV1과 FVC에서 유의하게 증가하였으며(p<0.05), 목빗근과 앞목갈비근에서 유의한 차이가 있었다(p<0.05). 실험군 집단 내 변화비교에서 폐기능은 FEV1과 FVC에서 유의한 차이가 있었으며(p<0.01)(p<0.05), 목빗근과 앞목갈비근에서 유의하게 증가하였다(p<0.001). 집단 간 변화비교에서는 목빗근과 앞목갈비근에서만 차이가 있었다(p<0.05). 뇌졸중 환자에게 깊은 목 굽힘강화 운동은 이 근육들의 협응능력을 잘 유지하여 잘못된 수축을 감소시켜 호흡을 보조해주기 위한 중재방법으로 향 후 뇌졸중 환자에게 호흡운동 시행 시 목의 기능적인 측면을 향상하기 위한 연구가 필요할 것으로 판단된다. The purpose of this study is to present clinical basic data on the establishment of clinical intervention method for improvement of respiratory function by understanding the changes of respiratory muscle, prognosis and pulmonary function by mediating deep neck flexion exercise in stroke patients. Nine patients who mediated respiratory muscle exercise before the experiment as a control group, and 11 patients who mediated deep neck flexion exercise by the respiratory muscle exercise as a control group. Four weeks after measuring EMG, the items were re-measured in the same manner and analyzed. The experimental results showed that the change in the control group was significantly increased in FEV1 and FVC (p<0.05) and significantly increased in the neck and anterior ribs (p<0.05). Pulmonary function was significantly different between FEV1 and FVC (p<0.01) (p<0.05) and significantly increased in neck and anterior ribs (p<0.001). There was a difference only between the neck and anterior ribs in the comparison of changes among the groups (p<0.05). Deep neck flexion exercise for stroke patients is a mediation method to maintain the joints of these muscles to reduce false contraction and to assist breathing. I think it will be necessary
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맥켄지운동이 만성 목통증 환자의 목주위 근육 피로도와 목 장애지수에 미치는 영향
강정일 ( Jeong-il Kang ),백승윤 ( Seung-yun Baek ),정대근 ( Dae-keun Jeong ) 대한물리의학회 2019 대한물리의학회지 Vol.14 No.4
PURPOSE: This study tries attempted to provide basic clinical data to reduce pain and improve function by comparing the muscle fatigue of the superficial neck muscles and neck disability index (NDI) by performing McKenzie exercise or passive stretching exercise for chronic neck pain patients. METHODS: Sixteen chronic neck pain patients were selected and divided into the McKenzie group (n=8) and passive stretching group (n=8). The intervention program was performed three times a week for four weeks. The time for one exercise was 30 minutes. Before the intervention, the muscle fatigue the superficial neck muscles and NDI were measured. They were measured again after four weeks using the same method. RESULTS: The median frequency of the superficial neck muscles increased significantly in the McKenzie group and passive stretching group (p<.05). The NDI of both the McKenzie group and the passive stretching group decreased significantly. A comparison of the groups, revealed a significant difference in only the median frequency values of the upper trapezius muscle and splenius capitis muscle (p<.05). The NDI values of both groups were similar. CONCLUSION: Both McKenzie exercise and passive stretching exercises showed a significant difference in the degree of fatigue and NDI. McKenzie exercise delayed the replace of the fast twitch fibers which helped improve the muscle fatigue of the upper trapezius muscle and splenius capitis muscle. On the other hand, additional studies applying more variables for the muscle function to improve the symptom of chronic neck pain patients will be needed.
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영전압 스위칭 PWM 하프 브릿지 컨버터의 모델링 및 분석
강정일(Jeong-il Kang),정영석(Young-Seok Jung),노정욱(Chung-Wook Roh),윤명중(Myung-Joong Youn) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
The circuit effects due to the transformer primary side series equivalent inductance in the Zero Voltage Switching Pulse Width Modulated Half Bridge DCIDC Converter and its impact on the effective duty are analyzed. The steady state equations and the small signal model of the converter are derived incorporating the effects of the complementary control and the utilization of transformer primary side series equivalent inductance. The open loop plant dynamics are analyzed on the basis of the model derived. The model predictions are confirmed by experimental measurements.
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전기자동차 응용을 위한 DC-DC 컨버터의 설계 및 제어
강정일(Jeong-il Kang),노정욱(Chung-Wook Roh),이성세(Gun-Woo Moon),문건우(Sung-Sae Lee),윤명중(Myung-Joong Youn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In the fuel-cell electric vehicle system, the low-voltage output of unit fuel-cell demands a number of cells to be stacked in series to produce a DC link voltage which is high enough to drive the vehicle inverter system. However, this increases the complexity of the fuel-cell control system This paper presents a design of high-efficiency boost converter emplying the average current-mode control, which is able to convert a low voltage of a fuel-cell generator with a small number of unit cells to a stable and high DC link voltage for electric vehicle applications
ScienceON
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