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비정질 강섬유보강 시멘트복합체의 정역학특성 및 내충격성능 평가를 통한 구조물 적용 가능성 검토
강일수 ( Kang Il-soo ),김규용 ( Kim Gyu-yong ),이보경 ( Lee Bo-kyeong ),이상규 ( Lee Sang-kyu ),손민재 ( Son Min-jae ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
This study examined the effect that the amorphous metallic fibers had on the static mechanical properties and the impact resistance of cement composites to those of hooked steel fibers. The hooked steel fiber exhibited pull-out from the matrix after the peak flexural stress was attained, while the amorphous metallic fiber was not pulled out from the matrix, but was instead cut off. In terms of impact resistance, the amorphous metallic fiber reinforced cement composite was found to be more effective at resisting cracking than the hooked steel fiber reinforced cement composite. Therefore, amorphous metallic fiber should be used in fiber reinforced cement composite materials, and for structural materials, and for protection panels.
市乳의 貯藏期間에 따른 耐冷性 微生物 및 化學的 特性의 變化에 關한 硏究
이수원,강일수,양희진,백승천 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.1
The present study was conducted to predict shelf life of pasteurized milk with analysis of volatile compounds and sensory evaluation of milk to growth of psychrotrophic bacteria. Pseudomonas fluorescens KFRI 00194 inoculated concentration of 10^4 cfu/㎖ to observe of changes on sensory evaluation and volatile compounds of pasteurized milk. The results obtained in these experiments were summarized as follows; The psychrotrophic bacteria number at 4℃ were increased 6.39×10 exp(4)cfu/㎖ until first day and 2.20×10 exp(6)cfu/㎖, 1.17×10 exp(7)cfu/㎖ after 5 and 10days, respectively. The volatile compounds were shown the decreasing tendancies in acetaldehyde, ethanol depending on storage days, especially ethanol contents were significantly decreased between 5 and 10days storage(P<0.05). Diacetyl, 2-heptanone, 2-butanone and 3-methyl-1-butanol were shown the increasing tendencies of contents. Diacetyl, 2-heptanone and 2-butanone were significantly increased between 5 and 10days, 1 and 5days, 5 and 10days and 1 and 5days, respectively(P<0.05). However, 3-methyl-1-butanol was shown a increasing tendancy depending on storage days but the significantly different was not recognized. The changes of sensory evaluation were rapidly decrease from 6.8point first day to 4.2point after 10days and the decrease of organoleptic acceptability was significantly different recognized(P<0.05), excepted of 1 and 2days. The organoleptic acceptability according to increasing of psychrotrophic bacteria numbers were decreased. The organoleptic acceptability depending on changes of volatile compounds were shown to a conversed correlation coefficient with the exception of acetaldehyde and acetone. Especially, 2-heptanone, 2butanone and 3-methyl-1-butanol were gradually decreased of acceptability by the contents.
Study on the Control Scheme for High Performance SRM Drive
Ahn,Jin Woo,Kang,Il Soo 慶星大學校 1994 論文集 Vol.15 No.4
SRM구동을 위한 새로운 제어방식을 제안하였다. 이 제어방식은 발생토오크를 크게 하고, 토오크리플을 줄이며 전류(轉流)를 쉽게 한다. 고토오크 구동을 위해 평활전류조건을 해석하였으며, 이는 스위칭각과 전압의 제어에 의해 얻어진다. 제안한 제어방식의 타당성을 확인하기 위해 전력 및 제어회로를 구성하였다. 전력회로는 여자전압과 감자전압이 같은 클래식 인버터를 채택하였으며, 제어회로는 제어의 가변성을 확보하기 위해 디지탈 제어회로로 구성하였다. 실험결과 우수한 구동특성을 보였다.