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고출력 마그네트론 구동용 3.6 MW, $4\;{\mu}s$, 200 pps 펄스 모듈레이터 개발
장성덕,권세진,배영순,오종석,조무현,남궁원,손윤규,Jang Sung-Duck,Kwon Sei-Jin,Bae Young-Soon,Oh Jong-Seok,Cho Moo-Hyun,Namkung Won,Son Yoon-Kyoo 대한전기학회 2005 전기학회논문지C Vol.54 No.3
The Korean Superconducting Tokamak Advanced Research (KSTAR) tokamak device is being constructed to perform long-pulse, high-beta, advanced tokamak fusion physics experiments. The long-pulse operation requires the non-inductive current drive system such as the Lower-Hybrid Current Drive (LHCD) system. The LHCD system drives the non-inductive plasma current by means of C-band RF with 2-MW CW power and 5-GHz frequency. For the LHCD test experiments, an RF test system is developed. It is composed of a 5-GHz, 1.5-MW pulsed magnetron and a compact pulse modulator with $4\;{\mu}s$ of pulse width. The pulse modulator provides the maximum output voltage of 45 kV and the maximum current of 90 A. It is composed of 7 stages of Pulse Forming Network (PFN), a thyratron tube (E2V, CX1191D), and a pulse transformer with 1:4 step-up ratio. In this paper, the detailed design and the performance test of the pulse modulator are presented.
장성덕(Jang, Sung-Duck),김병준(Kim, Byoung-Jun),김윤희(Kim, Yoon-Hee) 한국사회체육학회 2016 한국사회체육학회지 Vol.0 No.66
This study explored the perceptions and specific behaviors of habitual exercisers who experienced the entire stages of exercise behavior change. Six habitual exercisers who were in the maintenance stage provided information on how they experienced through the entire stages of exercise behavior change. Qualitative data collection strategies such as participant observation and focus group interviews were employed. Most of the participants had positive attitude toward physical activity when they were in their pre-contemplation and contemplation stages. Accordingly, the positive attitude had indirect influences on joining their sports(basketball). Overall, friends and colleagues were major motivators to make them adopt physically active lifestyle. In preparation stage, participants experienced positive and negative effects of group dynamics. While supportive group environment had positive influences on continued participation, bland environment had negative consequences. For those in their preparation stage, it is recommended that efforts should be made to promote enriched group environment. Action and maintenance stages were characterized by improved physical fitness and skill levels. In addition, the participants were more interested in self-related factors and were more stable in terms of social impacts. It was found that the participants in their action and maintenance stages were able to change negative events to positive ones and reinforce themselves intrinsically. The participants reported that positive and adaptive mental processes that they experienced in the action and maintenance stages played significant roles in their job situations and active lifestyles. These findings support the concept of stages of behavior change and help understand how exercisers perceive and behave in each stage of exercise behavior change.
장성덕(Sung-Duck Jang),손윤규(Yoon-Gyu Son),오종석(Jong-Seok Oh),권오정(O-Jung Kwon) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.3
The application of a pulsed power system is being extended to a environmental and industrial fields. The non-dissolution waste water pollutants from industrial plants can be processed by applying high voltage pulses with a fast rising time (a few nanoseconds) and short duration (nano to microseconds) in a pulsed corona discharge reactor. The nano-pulse generator with a magnetic switch has been developed. Its corona current in load can be adjusted by pulse width and repetition rate. we investigated the performance of the nano-pulse generator using the dummy load which is composed of resistor and capacitor equivalent to the actual reactor. This paper descibes the electrical characteristics of the nano-pulse generator that produces a 300 ns pulse at maximum repetition rate of 400 pps with a voltage of 40 kV across a 640 Ω load. In this paper we briefly discuss a configuration of system and test results.<br/>