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손태훈,이용길,정장근 동의공업대학 2001 論文集 Vol.27 No.1
When dielectric surface electric field exceed any electric field strength on air, corona discharge is occurred from the dielectric surface. Its corona may be concerned that reduction of internal pressure and abnormal of machinery and tools because of unusual phenomenon produced on high voltage device. This paper presents corona discharge phenomena on the dielectric in high field were studied under application of ±DC voltage, constitute of the point to plane 20mm gap. The results obtained in experimental are summarized as follow: ① By operating on dielectric as the gap of series resistance, Corona current is limited and electron produced in electron avalanche repress the growth of following corona because electron stuck to surface of dielectric alleviate space electric field of point terminal. ② Positive corona increases peak value and density of current with increasing applied voltage. ③ Negative corona only increases density of current and peak value of current does not grow.
통근 수단 전환을 통한 신체활동 증가가 체력 및 심혈관계에 미치는 영향
임길병 ( Kil Byung Lim ),이홍재 ( Hong Jae Lee ),문정화 ( Jung Wha Moon ),정태호 ( Tae Ho Jung ),성현곤 ( Hyun Gun Sung ),박지형 ( Ji Hyung Park ),김혜자 ( Hae Ja Kim ) 대한스포츠의학회 2009 대한스포츠의학회지 Vol.27 No.1
This study was aimed to identify the effects of the change of commuting modes for 8 weeks on physical fitness and cardiovascular risk factors. We recruited volunteers who are sedentary, drive his/her own car for commuting, are aged from 30 to 49, but have no known definite medical diseases. They chose one of three groups respectively: walking, cycling and pubic transportation (PB). Sixty male subjects participated to this study: 19 for walking group, 14 for cycling, and 27 for PT group. In graded exercise test, the resting systolic blood pressure (BP) decreased significantly in walking and PT group (p<0.05), and the resting diastolic BP decreased significantly in walking and cycling group. VO2max increased significantly in all three groups. In isokinetic strength test, the knee extensor measured in 60 degree/sec speed increased significantly in walking and cycling group. In the physical fitness, hand grip strength increased in cycling group only, back strength and 30sec sit up increased in PT group, one leg standing with eye-closed increased in cycling group. The cardio-vascular risk factors in blood such as glucose, Triglyceride, cholesterol, hs-CRP were not changed in all three groups. This study suggest that the change of commuting modes from a private car mode to an active movement mode may increase the volume of physical activities with low-density in daily, which may give positive effect on BP, VO2max, muscle strength in knee extensor and back muscle, and standing balance.