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전자석 작동기를 이용한 드릴의 선회진동제어 : Control of the Whirling Vibration of the Drill by Electromagnetic Actuator
김중배,이상조,최현 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2
The drill is the most widely used tool in the world to make holes on the workpiece. But the performance of the drill is affected by many factors. One of them is to get the position of the drill at the beginning of the penetrating stage. The drill vibrates laterally while it rotates. Especially in case of a thin and long drill, the magnitude of the whirling vibration of the drill becomes very large and makes critical problem. Therefore, several methods have been used to get a correct position during drilling process. As an example, center drills or guides are used to make the drill get correct position. But these methods are passive. In this paper, studies for an active control are carried out to get the correct position of the drill by reducing the whirling vibration of the drill which occurs before the drill contacts the workpiece. The active phase lead algorithm is applied in order to control the vibration of a twist drill, which has dimension as follows: diameter φ3 and length 150mm.
Haloperidol 및 L-dopa 投與가 생쥐의 스트레스性 胃潰瘍 發生에 미치는 효과
장현갑,강성군,배중철 한국심리학회 1990 한국심리학회지 생물 및 생리 Vol.2 No.1
본 연구는 dopamine 체계가 스트레스성 위궤양 발생에 어떤 영향을 미치는가를 알아 보기 위한 것이다. 생후 21±1일에 이유시킨 생쥐(ICR 혈통)를 60일간 사육한 후 dopamine 수용기 차단제인 haloperidol(1㎎/㎏), dopamine 전구물질인 L-dopa(150㎎/㎏) 그리고 생리식염수를 투여 하였다. 약물처치후 1시간 동안의 저온-구금조건과 1시간 30분 동안의 휴식 시간이 경과한후 위를 추출하여 위궤양 발생 정도를 평정 하였더니 다음과 같은 결과를 얻었다. 즉, 1) L-dopa 처치집단이 식염수 처치집단보다 위궤양 발생 정도가 유의미하게 낮았으며, 2) haloperidol 처치집단은 식염수 및 L-dopa 처치집단 보다 위궤양 발생 정도가 유의미하게 높았다. 본 연구의 결과는 dopamine이나 dopamine 활성물질을 중추 또는 말초로 주사하면 스트레스성 위궤양 발생을 억제 시킬수 있다는 Hernandez 등(1984)의 발견과 dopamine 수용기를 차단하는 약물의 투여는 위궤양 발생을 촉진시킨다는 Ray 등(1988)의 연구 결과와 유사하다. The purpose of present sutdy investigated the effect of haloperidol and L-dopa on the gastric ulcerationin in mice, 30 Male mice were separated from their own litters on the weaning (21±1 days) and then reared in group for 60 days. The mice were randomly allocated into three groups: 1) Saline group. Haloperidol(1㎎/㎏) group, L-dopa(150㎎/㎏) group. They were immobilized individually in supine-restraint devicers at 4℃, and after 1hr of cold restraint and 1½hr postrestraint rest period. The mice were sacrificed with an overdose Chloral Hydrate(400㎎/㎏, ip). The stomachs were then dissected out, cut alling the greater curvature, washed in cold water and examined micrescopically(×100) for gastric lesions. Histological samples were assessors in four scales. The results obtained were as follow; 1) L-dopa treated group revealed significantly lower stress-induced ulceration score than saline treatment group.
Identification of Subspecies-specific RAPD Markers in Rice
Joong Hyoun Chin,Jung Hee Kim,Soon Wook Kwon,Young Il Cho,Zhong Ze Piao,Long Zhi Han,Hee Jong Koh 한국육종학회 2003 한국육종학회지 Vol.35 No.2
The subspecies-specif ic RAPD markers were identif ied using 30 varieties (15 japonica and 15 indica) from diverse geographical origins. Of 690 random primers tested including subspecies-specif ic (SS) RAPD markers reported earlier, 55 primers generated 6
Development of gene-specific markers for Phosphorus uptake 1(Pup1) and Pi-gene specific markers
Joong Hyoun Chin,Cheryl O. Dalid,Maria Ruby Burgos,Stephan Haefele,Matthias Wissuwa,Masdiar Bustamam,Yohei Koide,Ona Isabelita,Nobuya Kobayashi,Casiana Vera Cruz,Sigrid Heuer 한국육종학회 2010 한국육종학회 학술발표회 발표요지 Vol.42 No.1