• Korean Journal of Acupuncture
• /
• v.33 no.4
• /
• pp.213-220
• /
• 2016

Objectives : The aim of this paper is to develop acupuncture needle heating system by utilizing the new method which uses high frequency(HF) time-varying magnetic field. Also, it is possible to make an assessment for reliability and clinical significance of the system. Methods : We designed the system with solenoid coils for generation of HF time-varying magnetic field that oscillates at 150 kHz. Acupuncture needles are quickly magnetized and heated by 150 kHz. We assessed clinical significance of system, such as body temperature, pressure pulse waveform. Results : Temperature of acupuncture needle increased up to 60 degree. In the result for clinical significance of system, in case of manual acupuncture stimulation(MAS), body temperature change was $0.373^{\circ}C{\pm}0.224$(p<0.05), rate of pulse energy change increased about 7.6%. In case of warm acupuncture stimulation(WAS), body temperature change was $0.645^{\circ}C{\pm}0.281$(p<0.05), rate of pulse energy change remarkably increased about 35.9%. Conclusions : We confirm that the system is able to be applied clinically to various warm acupuncture needle therapy in the area of oriental medicine.

• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.48 no.3
• /
• pp.215-220
• /
• 1999

$SO_2$and CO gas removal characteristics of a wire-to-cylinder type nonthermal discharge plasma reactor in various applied voltage (-dc, ac, fast rising pulse and high frequency pulse) and a crossed dc magnetic field have been investigated. The experiment has been emphasized on the oxidizing characteristics of $SO_2$ and CO gas by $O_3$ and the applying of a crossed magnetic field, which would induce the cyclotronic and drift motions of electrons making the residual time longer in the removal airgap space. And it also would enhance the energy of electrons and the electrophysicochemical actions to remove the pollutant gases effectively. It is found thatthe corona onset voltage and the breakdown voltage were decreased with increasing the crossed magnetic field and decrease initial fed $SO_2$and CO concentration. As a result, a higher ozone generation and $SO_2$ and CO gas removal rate of 20[%] can be obtained with -dc, ac and fast rising pulse corona discharges in the crossed dc current-induced magnetic field. But high frequency pulse didn't show effect in applying of a crossed magnetic field.

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.02a
• /
• pp.191-192
• /
• 2009

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.02a
• /
• pp.275-276
• /
• 2009

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.02a
• /
• pp.335-336
• /
• 2009

• Journal of the Korean Institute of Telematics and Electronics A
• /
• v.28A no.11
• /
• pp.910-914
• /
• 1991

This paper describes the improvement of frequency characteristic of crystal oscillator I.C using Ti-Salicide. The characteristics of transistor(drive current) using Ti-Salicide process are better than Poly-Si process, because the mobility. To know frequency characteristic of oscillator I.C, the simulation is performed using inverter buffer chain of Fan-out 10 TTL. Its result shows at once the generation of normal clock pulse in input signal and the improvement of rising and falling time.

• Proceedings of the Optical Society of Korea Conference
• /
• 2007.07a
• /
• pp.215-216
• /
• 2007

• 제어로봇시스템학회:학술대회논문집
• /
• 1990.10a
• /
• pp.252-257
• /
• 1990

For the position control of BL-DC motors, 2.phi.-3.phi. conversion unit, hysteresis band device, and PWM pulse generation are required. By utilizing a single-chip processor INTEL 8097BH, we cover all required functions. As a result, no analogue device is employed in this control scheme, so that it makes BL-DC motor controller simple and flexible. Furthermore, the single-chip processor is utilized for the nonlinear coordinate transformation which is necessary for the linearization of the motor system.

• Proceedings of the KIEE Conference
• /
• 1997.07e
• /
• pp.1859-1860
• /
• 1997

다전극 DFB(distributed feedback) 레이저서, 레이징모드간 비팅을 통하여 초고속으로 자려펄스열을 발생시킬 수 있음을 제안한다. 이러한 자려펄스생성을 수정된 시영역 동적 모델(large signal time-domain dynamic model)을 이용하여 조사하였다.

• Proceedings of the Korean Nuclear Society Conference
• /
• 2005.05a
• /
• pp.1044-1045
• /
• 2005