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전기자극에 의해 유발된 통증에 대한 말초 전침자극의 진통효과
황준하,Hwang, Joon-Ha 대한생리학회 1987 대한생리학회지 Vol.21 No.1
The present experiment was performed in 35 normal male volunteers to evaluate the effect of electroacupuncture on the human nociception more clearly and to demonstrate the effect of different parameters of electrical stimulation through acupuncture needles. The threshold of the pain(Tp) and the nociceptive flexion reflex(Tr), the threshold for intolerable pain(Tip) and that for obtaining maximal reflex response(Tmr) were studied before and after electroacupuncture performed on the acupoints of tsusanli and hsuanchung. 1) For the pricking pain, electroacupuncture with intermittent stimulation induced a significant decrease in Tp which recovered after removal of the needles. There was no significant change in other thresholds. 2) For the dull pain, electroacupuncture with intermittent stimulation produced a significant increase in Tp which continued after removal of the needles. But there was no signifcant change in Tip. Electroacupuncture with continuous stimulation induced a slight increase in Tp. 3) After resting without electroacupuncture, Tp and Tip of the dull pain were slightly decreased. These results suggest that electroacupuncture had no significant analgesic effect on the pricking pain induced by electrical stimulation of the foot skin. However, electroacupuncture with intermittent stimulation had significant analgesic effect on the weak dull pain and it had slightly greater analgesic effect than electroacupuncture with continuous stimulation.
초음파 기반 마찰전기 발전소자를 이용한 체내 삽입형 신경자극기
최수빈(SuBin Choi),황준하(Joon-Ha Hwang),정영욱(Youngwook Chung),정장묵(Jang-Mook Jeong),김상우(Sang-Woo Kim) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
Given that implantable medical devices are designed for long-term operation while being implanted inside the human body, it is of paramount importance to ensure a sustainable power source. The utilization of wireless power transfer technology for the continuous supply of energy has been constrained by the necessity for titanium packaging, which is essential for achieving both long-term biocompatibility and the hermetic sealing of the device. In this study, we implemented a battery-free miniaturized neurostimulator using an ultrasound-driven implantable triboelectric nanogenerator, which can harvest energy through titanium packaging. This medical device efficiently delivers sufficient power to generate stimulation pulses and has demonstrated its efficacy in alleviating symptoms associated with urinary tract complications in in-vivo demonstration using a rat model. These accomplishments mark significant advancements in the development of devices that are permanently implantable for treating intractable diseases.
체내 삽입형 의료기기를 위한 에너지 하베스팅 기술의 발전 동향
박수경(Sookyung Park),최정운(Jeongun Choe),황준하(Joon-Ha Hwang),정영욱(Youngwook Chung) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
Implantable medical devices (IMDs) play a vital role in modern medicine, enabling a variety of physiological therapies beyond the scope of pharmacological approaches. However, conventional IMDs require frequent surgery for maintenance due to short battery life. Energy harvesting technology represents a promising solution to provide sustainable power to IMDs. In this article, we describe the characteristics and research trends of in-body energy harvesting technologies, with a special focus on triboelectric nanogenerators. We also discuss the direction of triboelectric energy harvesting technology to provide sustainable power for IMDs.
TICOM 시스템 버스 프로토콜에서 캐쉬간 직접전송이 가능한 개선된 프로토콜의 구현
주영복(Young-Bok Ju),이범식(Bum-Sik Lee),한종석(Jong-Sok Han),황준하(Joon-Ha Hwang),송성진(Sung-Jin Song),박신민(Shin-min Park),한탁돈(Tack-Don Han),김성천(Sung-Chun Kim) 한국정보과학회 1992 한국정보과학회 학술발표논문집 Vol.19 No.1
본 논문에서는 현 TICOM 시스템 버스 구조하에서 캐쉬간의 직접전송이 가능한 개선된 버스 프로토콜을 제안하고 TICOM 시스템에 최소한의 수정을 가해서 제안된 프로토콜을 실제로 구현하였다. 원래의 Illinois 캐쉬 일관성 프로토콜에서는 cache-to-cache 직접전송이 가능하다. TICOM 시스템에서는 요청기(RQ ReQuester)와 응답기(RP ResPonder)가 나뉘어진 분리형 시스템 버스인 Pended 버스 프로토콜과 수정된 Illinois 캐쉬 일관성 프로토콜(Modified Illinois Cache Coherence Protocol)을 채택하고 있기 때문에 캐쉬간 직접전송이 불가능하여 원래의 Illinois 프로토콜이 가진 캐쉬간 직접전송이라는 장점을 살리지 못하고 있다. 이의 개선을 위하여 TICOM 시스템 버스와 관련된 제반 프로토콜과 회로를 분석하고 최소한의 변경으로 cache-to-cache 직접전송이 가능하도록 RQBI(ReQuester Bus Interface 요청기 버스 인터페이스)와 RQC(ReQuester Controller 요청 제어기)부분의 회로를 재설계하고 논리적 검증을 하여 실제 TICOM 시스템에 활용할 수 있도록 하였다. 개선된 버스 프로토콜은 평균 메모리 접근시간(Average Memory Access Time)및 버스 사용률(Bus Utilization)에서 성능이 향상됨을 볼 수 있다[1].