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300마력 60000rpm급 초고속 전동기의 실측 전류 파형을 고려한 손실 특성 해석
장석명(Seok-Myeong Jang),한철(Cheol Han),고경진(Kyoung-Jin Ko),이용복(Yong-Bok Lee),김태호(Tea-Ho Kim),이성호(Sung-Ho Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper deals with comparison and analysis for various losses of high-speed permanent magnet synchronous motor using phase current harmonic analysis. Through measured current wave, various losses are calculated and compared with losses according to current sine wave. Poynting vector, Steinmetz equation, finite element method and so on have been used to investigate the losses of high-speed permanent magnet machine.
호기 기능 강화 훈련이 뇌졸중 삼킴 장애 환자의 삼킴 및 호기 기능에 미치는 영향
장석영(Jang Seok-Young),고태성(Ko Tae-Sung),김형근(Kim Hyung-Geun) 대한치료과학회 2015 대한치료과학회지 Vol.7 No.2
Objective: The purpose of this study is to examine the effect of expiratory muscle strength training on the swallow function in stroke patients with dysphasia. Method: Stroke patients with swallowing disorders were randomly assigned to two groups, of 15 members. They received training for 20-minute session, five times per week, over an eight week intervention period. Their swallowing functions were eval uated through a videofluoroscopic study, and their expiratory function was assessed by comparing improvements in maximal expiratory pressure and peak expiratory flow. Comparisons between the groups before and after interventions employed the Chi-squared test, Mann-Whitney U test, and Wilcoxon’s signed-ranks test. The statistical significance levels for all data were set at p<.05. Results: For both groups, the intervention promoted swallowing and expiratory function. In the comparison between groups it showed no significant difference after intervention, except aspiration, vallecular residue, maximal expiratory pressure and peak expiratory flow. Conclusion: Expiratory muscle strength training helps with swallowing and expiratory function. In addition, eligibility was found to have a stronger effect than resistance training, by 10 % to 75 %
자기등가회로법을 이용한 매입형 영구자석 전동기의 토크 해석
장석명(Seok-Myeong Jang),황선익(Seon-Ik Hwang),박유섭(Yu-Seop Park),최장영(Jang-Young Choi),서진호(Jin-Ho Seo) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper deals with d, q-axis inductance derivation and torque calculation of interior permanent magnet synchronous motor (IPMSM). Applying equivalent magnet circuit, magnetic flux linkage and d, q-axis inductance are obtained. With those results, magnetic torque and reluctance torque are calculated. In addition, this results are compared and analyzed with 2-d finite element analysis (FEA) to validate this paper.