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Townsend 방전영역의 불꽃전압에 미치는 음극표면상태의 영향
백용현 대한전기학회 1979 전기의 세계 Vol.28 No.1
There are a great number of papers on the Townsend discharge in gases, and many of them are concerned with the effect of the cathode. It has been regarded that there are two kinds of effect of the electrodes, especially of the cathode; (a) the effect caused by the difference of the cathode material and (b) the effect by the change of the cathode surface state even in the same material. Both of them may change the secondary coefficient following after the change of the work function, and the atter may further change the primary ionization coefficient as foreign atoms on the surface may be dseorbed in sparks to decrease the purity of the gas. Thus the two effects must be investigated independently to study the roles of the cathode in gas discharges. In this report the effect of the cathode material on the sparking voltage is described. The experiment is also carried out under the condition that the desorption of impurities from the cathode be negligible. From these the new correlativity between the work function of the cathode and the sparking voltage is obtained. In addition, the interesting character of the minimum point of the Paschen's curve can be found.
$SF_{6}$ 가스에 대한 특성시험과 사용상의 문제점
백용현 대한전기학회 1980 전기의 세계 Vol.29 No.6
본고의 내용은 다음과 같다. 1. $SF_{6}$가스의 개요특성 2. 절연파괴특성과 시험조건 3. 각종불순물의 영향 4. 수분의 대책
백용현 대한전기학회 1980 전기의 세계 Vol.29 No.8
The traditional mechanical manometer is improved to develop more convenient and precise manometer in continuous measurement of the gas pressure in medium-low vacuum range (1x10$^{-1}$ -10 Torr.) Glass (solid) is used as a detector material of the improved manometer. Using the strain gauge adhered to thin glass board, mechanical strain corresponding to variation of pressure in measurement system is converted into quantity of electricity, and the quantity of electricity is amplified. Experiments have also shown that the improved manometer have more advantages in reproducibility, measured sensibility, and responsible velocity than taditional one.
저기압희유 gas중에서 불꽃전압에 미치는 음극표면상태의 영향
백용현 대한전기학회 1974 전기의 세계 Vol.23 No.4
Generally, it has been regarded that there are two kinds of the effect of the electrodes, especially of the cathode in the gas discharge, (a) the effect caused by the difference of the cathode meterial and (b) the effect by the change of the cathode surface state even in the same meterials. Thus the two effects must be investigated independently to study the roles of the cathode in gas discharges. This paper measured sparking voltage in Rare gas (Ar, He) for the change of sparking voltage in repeating sparks and for the effect of (a) and (b) mentioned above, under the condition that the desorption of impurities from the cathod can be nigligible, and it is obtained that the correlative relations of the work function, sparking voltage and secondary coefficient are comparatively simple. In addition, the interesting character of the minimum point of the paschen's curves is found. The results were as follows; 1) The value of (pd)min with minimum pint of sparking voltage, (Vs)min, is 0.7-0.9 Torr. cm in Argon, but is 5.6-7.1 Torr. cm in Helium, and Paschen's curve in Helium shows slow curve than in Argon. 2) The minimum point of the Paschen's curve is satisfied actually Townsend's self sustaining criterion in Argon, but non-satisfaction in Helium, and the Townsend's secondary coefficient .gamma. action have compound property (.gamma.$_{i}$, .gamma.$_{p}$, .gamma.$_{m}$) in Helium. 3) The dependenting character of work function in Helium is less than in Argon. 4) The minimum point of sparking voltage increase under oxidized electrode than clear electrode in Au and Ag, but minimum point decrease in Ni and Cu.
테이핑이 중풍환자의 마비측 일상생활 동작활동에 미치는 영향
백용현,서정철,이재동,Baek, Yong-Hyeon,Seo, Jung-Chul,Lee, Jae-Dong 대한침구의학회 2001 대한침구의학회지 Vol.18 No.2
Objectives : In order to study the effect of taping therapy on the activity of daily living of poststroke-hemiplegic patients, a clinical study was performed. Methods : Twenty patients with poststroke-hemiplegia were randomized into two groups. Ten patients treated with kinesio taping. The other ten patients didn't treat with kinesio taping. Tapes were applied to the Deltoid, Supraspinatus, Infraspinatus, Brachioradialis, Gluteus Maximus, Adductor muscles of the hip, Sartorius and Tibialis Anterior. The activity of daily living was measured with a modifted barthel index(MBI). The taping therapy was performed twice a week for 2 weeks. Results : In terms of improvement of activity of daily living, the smaple group showed statistically meningful increase after 2 times treatment compared with control group(p<0.05). In terms of self care score of MBI, the sample group showed statistically meningful increase after 1 time treatment with the control group(p<0.05). In terms of mobility score of MBI, the sample group showed statistically meningful increase after 3 times treatment with the control group(p<0.05). Conclusions : These results support that taping therapy is significantly effective in improvement of the activity of daily living of poststroke-hemiplegic patients.