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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.
남종길(Jong Kil Nam),정석근(Suk Gun Jung),김태남(Tae Nam Kim),박성우(Sung Woo Park),정문기(Moon Kee Chung) 대한비뇨기종양학회 2011 대한비뇨기종양학회지 Vol.9 No.1
Purpose: We evaluated lymphovascular invasion (LVI) as a prognostic factor and the outcome in patients with transitional cell carcinoma of the upper urinary tract. Materials and Methods: Between 1996 and 2009, we retrospectively reviewed the series of 136 patients who underwent nephroureterectomy with bladder cuff resection for transitional cell carcinoma of the upper urinary tract. Among 136 patients, those who had distant metastasis (2 patients), concomitant invasive bladder cancer (20 patients), incomplete resection or positive surgical margin (12 patinets) and follow up loss or unavailable data (n=18) were excluded in this study. 84 patients were selected to evaluate the 5 year survival rate and 5 year disease free rate by using log rank test of Kaplan-Meier according to the factor of the lymphovascular invasion. We evaluated the prognostic factors by using Cox regression. The prognostic factors were age, Sex, T stage, N stage, grade, location of the cancer (pelvis and ureter) and lymphovascular invasion. Results: The mean age of the patients when the operation performed was 66.6 year-old and the mean period of follow-up study was 42.2 months (7-161 months). Male patients are 56 and female patients were 28. The Ta/T1 and T2-4 stage was 40 and 44. The N0 and N1-3 were 72 and 12. The grade I-II and III were 45 and 39. Cancer in pelvis and ureter were 29 and 54. 24 patients were diagnosed with LVI. The 5 year survival rate in LVI positive and negative were 59% and 84.5% (p=0.014), and the 5 year disease free rate were 28.4% and 74.3% (p=0.004), respectively. T stage, N stage and LVI were significant prognostic factors in 5 year survival rate and 5 year disease free rate. However, tumor location was not an independent predictor for recurrence, and there was no difference in the probability of disease recurrence between ureteral and renal pelvic tumor. Conclusions: LVI regarded as a prognostic factor in 30% of patients of transitional cell carcinoma in upper urinary tract and could be independent prognostic factor of disease free rate and survival rate.