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요부 안정화 운동이 여자대학생의 척추측만도, 심부근 면적, 근기능 및 요통지수에 미치는 영향
이정석 ( J. S. Lee ),소용석 ( Y. S. So ),김미자 ( M. J. Kim ),문성진 ( S. J. Moon ),장성동 ( S. D. Jang ),김영준 ( Y. J. Kim ) 한국운동생리학회(구-한국운동과학회) 2011 운동과학 Vol.20 No.1
본 연구는 여자대학생을 대상으로 요부 안정화 운동이 체간의 심부근인 다열근의 면적증가, 콥스각의 변화 및 주관적 통증지수(VAS)의 상호연관성을 규명하는데 목적이 있다. 연구대상은 여자 대학생 30명을 대상으로 척추 X-ray 촬영하여 Cobb`s 각에 이상이 있는 체형불균형으로 진단된 20명을 운동군 12명과 대조군 8명으로 분류하였다. 운동 프로그램은 8주간, 주 3회, 운동 강도는 1~4주는 40~50% HRR, 4~8주는 50~60% HRR, 운동시간은 1회 90분 실시하였다. 측정항목은 심부근 면적, 척추측만도, 요통지수, 등속성 운동에 의한 근기능 검사와 상호연관성을 검사 하였다. 다열근 면적은 운동군에서 시기 간에 L1과 L5에서 유의한 차이가 나타났으며, 집단 간의 비교에서는 L5(우)에서 유의한 차이가 나타났다. 요통지수는 시기 간에 유의한 차이가 났으며, 등속성 운동에 의한 근기능 검사에서는 집단 간에 최대근력에서 유의한 차이가 나타났다. 이중 다열근 면적의 증가는 척추측만각도를 감소시킴으로서 요통 통증지수의 감소에 효과적인 것으로 나타났다. 결론적으로 요부 안정화 운동은 척추측만도, 심부근육면적, 요통지수 및 근기능 개선에 효과적인 운동으로, 체형불균형으로 인해 나타날 수 있는 병적 요인들을 감소시킬 수 있을 것으로 사료된다. The research was carried out to investigate the effect of lumbar stabilization exercise in the multifidus area, the Cobb`s angle and correlations of subjective VAS in the female university students who had participated in a lumbar stabilization exercise program. Thirty female university students aged 20-24 were taken spinal X-ray. Twenty who have abnormal Cobb`s angle were diagnosed as an imbalance in their body and they were sorted into exercise group(n=12) and control group(n=8). The exercise program was proceeded for 8 weeks, 3 times/week and 90 minutes/time. The intensity of exercise were 40-50% HRR during 1-4 weeks, 50-60% HRR during 4-8 weeks. Deep muscle area, scoliosis, VAS, and Cobb`s angle were measured. The effects of muscular function test and correlation of the measurements were tested as follows. There were significant differences in area between the time of the multifidus muscle L1(left, right) and L5(left, right) in appearance. And in comparisons with among groups, there were significant differences in the L5 multifidus muscle. There was meaningful difference in VAS of exercise group. In case of the muscular function test by Isokinetic exercise, meaningful differences in peak torque were founded among the groups. And also, there were meaningful differences among groups as well. In conclusion, lumbar stabilization exercises have positive effects on cobb`s angle, multifidus area, VAS and the improvement of muscular function. As the significant correlation was appeared between increases of multifidus area and decreases of VAS, it is possible to reduce pathological factors which appeared in the imbalances through increases of deep muscle by high lumbar stabilization exercise.
산업용 선형가속기 시스템 적용을 위한 30MW 클라이스트론용 고 평균전력 펄스 트랜스포머의 설계
장성덕(S. D. Jang),손윤규(Y. G. Son),권세진,오종석(J. S. Oh),문성익(S. I. Moon),김상호,조무현(M. H. Cho),남궁원(W. Namkung),Y. S. Bae,H. G. Lee 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
An L-band linear accelerator system for e-beam sterilization is under design for bio-technology application. The klystron-modulator system as RF microwave source has an important role as major components to offer the system reliability for long time steady state operation. A PFN line type pulse generator with a peak power of 71.5-㎿, 7 ㎲, 285 pps is required to drive a high-power klystron. The high power pulse transformer has a function of transferring pulse energy from a pulsed power source to a high power load. The pulse transformer producing a pulse with a peak voltage of 275 ㎸ is required to produce 30-㎿ peak and 60 ㎾ average RF output power at the frequency of 1.3-㎓. We have designed the high power pulse transformer with 1:13 step-up ratio. The peak and average power capability is 71.5-㎿ (275 ㎸, 260 A at load side with 7 ㎲ pulse width) and 130 ㎾, respectively. In this paper, we present a system overview and initial design results of the high power pulse transformer.
Pulsed Nonthermal Plasma Processing for Industrial DeNOx/DeSOx Control
장성덕(S. D. Jang),조무현(M. H. Cho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Pulsed corona induced plasma chemical process (PPCP) can be applied to the removal of pollutant gases from industrial plants such as power generation plants and incinerators. A PPCP unit, one of the world's largest scales of PPCP, has been tested for the simultaneous removal of NO<SUB>x</SUB> and SO₂ from the flue gas emission at an industrial incinerator with the gas flow rate of 42,000 N㎥/h. An average 120 ㎾ modulator using a magnetic-pulse-compression (MPC) switch is used to generate the nanopulse for corona induction. It was observed that the PPCP made significant NO<SUB>x</SUB> and SO₂ conversion with reasonable electric power consumption. NO removal efficiency was significantly improved by injecting a C₃H? additive. In this experiment, the removal efficiencies of SO₂ and NO<SUB>x</SUB> were analyzed by approximately 95% and 60%, respectively. The specific energy consumption during the normal operation was approximately 1.4 Wh/㎥ with the PPCP.
Design and Test Results of High-Power Pulse Generator System for Industrial Accelerator Application
S. D. Jang(장성덕),S. H. Kim(김상훈),H. Y. Yang(양해룡),M. H. Cho(조무현),I. S. Ko(고인수),W. Namkung(남궁원) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
A conventional linear accelerator system requires a flat-topped pulse with less than ± 0.5% ripple to meet the beam energy spread requirements and to improve pulse efficiency of RF systems. A a line-type pulsed modulator is widely used in pulsed power circuits for applications such as accelerators, radar, medical radiation, or ionization systems. The high-voltage pulse generator system with an output voltage of 284 ㎸, a pulse width of 10 ㎲, and a rise time of 0.84 ㎲ has been designed and fabricated to drive a klystron which has 30-㎿ peak and 60-kW average RF output power. The high-voltage test was performed using the klystron load. This thesis describes the design and test results of high-power pulse generator system for industrial accelerator application. The experimental results were analyzed and compared with the design.