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전현(Hyun Jeon),가동훈(Donghun Ka),안태영(Taeyoung Ahn) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper proposed synchronous rectifier in forward converter including resonance reset did not get efficiency drive waveform for that is existent dead time period. Therefore, proposed synchronous rectifier of new way accordingly to solve problem by happened drive circuit. Confirmed usefulness and practicality by drive circuit that compose experiment circuit and propose through experiment result. Input voltage of experiment circuit are 380V, and output voltage are 12V, and maximum output current is 20A, and maximum output was 100W.
젊은 여성의 몸통 근육 활성도 분석을 통한 목발 길이 측정 방법의 효율성 비교
전현 ( Hyun Jeon ),오덕원 ( Duck-won Oh ) 대한물리의학회 2020 대한물리의학회지 Vol.15 No.1
PURPOSE: This study compared the activities of the trunk muscles during crutch walking to determine which of the crutch length measurements is most beneficial. METHODS: Twenty young women volunteered to participate in this study. After adjusting crutch length, the participants performed a three-point walking with nondominant leg limited in weight bearing. This study used six crutch length measurements: (1) Height-40.6cm, (2) Height´.77, (3) Olecranon-to-finger length, (4) Axillary-toheel length, (5) Arm-span length-40.6cm, and (6) Arm-span length´.77. The EMG activities of the internal oblique (IO), rectus abdominis (RA), multifidus (MF), and erector spinae (ES), muscles on the weight bearing side were monitored using wireless surface EMG. RESULTS: The EMG activities of the RA and ES appeared to be significantly different among the crutch length measurements (p<.05). The post-hoc test showed that the ‘Arm-span length-40.6cm’ was significantly greater in the RA activity when compared to the ‘Height´.77’ and ‘Axillary-to-heel length’ measurements, and in the ES activity when compared to ‘Height´.77’ measurements. Furthermore, IO/RA and MF/ES ratios showed significant differences among the crutch length measurements (p<.05). In the post-hoc test, significant difference was observed between ‘Olecranon-to-finger length’ and ‘Arm-span length-40.6cm’ for the IO/RA ratio, and between ‘Height´.77’ and ‘Olecranon-to-finger length’ and between ‘Height´.77’ and ‘Arm-span length-40.6cm’ measurement for the MF/ES ratio. CONCLUSION: These findings suggest that the ‘Height´.77’ measurement is relatively advantageous to optimize the activities of trunk muscles during the crutch walking, and allow simple measurements of the crutch length.
1.5V 60A급 VRM의 인덕터 손실 분석에 관한 연구
전현(hyun Jeon),이달우(darl-woo Lee),안태영(tae-young Ahn),최광보(gwang-bo Choi) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, to report the experimental results the core losses of VRM inductor. The VRM, that has a output voltage 1.5V, output current 60A, maximum power of 90W. Experimental results verify, the VRM has a almost same data of fast transient response, a efficiency test with high flux and ferrite inductor. A maximum power conversion efficiency of the experimental VRM was measured at 92% within 0.2% load regulation.
남기우(Ki-Woo Nam),전현(Hyun Jeon),이기식(Ki-Sik Lee),탁영준(Young-Joon Tak) 한국동력기계공학회 2021 동력시스템공학회지 Vol.25 No.3
In this study, high-cost Cr and Ni components of 202 austenitic stainless steel were reduced, low-cost Mn was added, and the amount of martensite and mechanical properties were evaluated according to rolling temperature and rolling degree. In addition, the acoustic wave generated by internal deformation during tension test was detected, and the dominant frequency according to the amount of martensite was investigated by wavelet analysis. Parts of the austenite were transformed into α′ -martensite by rolling. More martensite was generated as the rolling degree was increased, and more martensite was generated as the rolling temperature decreased in the same rolling degree. The amount of martensite rapidly increased up to a rolling degree of 33%, and then gradually increased thereafter. In particular, the amount of martensite at rolling temperature of -196℃ was similar after the rolling degree of 33%. Vickers hardness and tensile (yield) strength increased as the rolling temperature decreased and the rolling degree increased. The elongation decreased rapidly. The dominant frequency decreased after increasing as the rolling degree increased at each rolling temperature, and the highest value was shown at 33% of the rolling degree.