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성냥과 KNSB의 연쇄적인 연소 반응을 활용한 SRM용 점화기 개발
유은주(Eun-Joo Yoo),김요한(Yo-Han Kim),박성현(Seong-Hyeon Park),서형권(Hyeong-Gwon Seo),손윤재(Yun-Jae Son),이기원(Gi-Won Lee) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
본 논문에서는 SRM의 연료인 KNSB를 연소시키기 위해, 성냥과 KNSB의 연쇄적인 연소 반응을 활용하여 SRM용 점화기를 개발하였고, 이는 기존 사용하던 점화기에 비해 46%p 가량 높은 성공률을 기록했다. 재료의 물성과 실험을 바탕으로 전력원의 전력에 따른 점화기의 점화 지연 시간을 추산했으며, 가장 효율적인 전력 구간과 그에 따른 최소 지연 시간을 측정했다. 데이터를 근거로 본 점화기의 적정사용전력은 45.4~56.4W로 규정하였다. In this paper, in order to burn KNSB, the fuel of SRM, an igniter for SRM was developed by utilizing a chain combustion reaction of a match and KNSB. The success rate has been increased by approximately 46%p, compared to the existing igniter. Based on properties of ingredients and experiments conducted, ignition delay time according to power of the source was calculated. Also, most efficient power range and minimum ignition delay time under the condition were measured. As a result, proper power for the igniter is defined as 45.4W~56.4W.
상박부 관상유경피부변을 이용한 우측 비익 성형술 1 예
이열희(Yeoul Hi Lee),변기정(Gi Jeoung Byeun),김효순(Hyo Soon Kim),이상일(Sang Il Lee),유윤재(Yun Jae Yoo) 대한악안면성형재건외과학회 1978 Maxillofacial Plastic Reconstructive Surgery Vol.1 No.1
The inner aspect of the arm is hairless & thin and, with the exception of its color, the skin is suitable far nasal covering. The technique described by Tagliacozzi employs a retrograde delayed flap from the arm. Because the Tagliacotian f p receives its blood supply from a distal base, the proximal base being detached fm transplantation, a preliminary delay of the flap is necessary. The case is that of a 52 yr. old female who had. lost her nasal alar due to trauma. Tubed pedicle flap of the arm had been applied for plastic surgery. The post operative result was excellent.
Piracetam이 마우스의 기억력 및 대뇌피질내 Acetylcholine량 변화에 미치는 영향
尹再順,申精姬,李容筍,劉永瓚 梨花女子大學校 韓國生活科學硏究院 1991 韓國生活科學硏究院 論叢 Vol.47 No.-
The central cholinergic synapse is known to be closely connected with memory. Previously, piracetam has been reported to improve the intellectual ability. We used a scopolamine-induced amnesiac mouse to study the effects of piracetam on memory retrieval by passive avoidance learning test and on the acetylcholine level of cerebral cortex. The amnesia was produced in mouse by the intraperitoneal injection(i.p.) of scopolamine at a dose of 1 ㎎/㎏ body weight(b.w.). Upon administration of piracetam to amnesiac mouse at doses of 100 and 200 ㎎/㎏ b.w., i.p., 30 min, prior to retrieval test, the significant improvement on memory impairment was observed by examination 24 hr after training. The level of acetylcholine in cerebral cortex of mouse was decreased by the scopolamine treatment, however, this decrease was attenuated by piracetam. These results suggest that the effect of piracetam on memory may be attributed to activation of cholinergic nerve.