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Conceptual Design Analysis for the Communications and Broadcasting Satellite Payload System
Lee, Seong-Pal,Eun, Jong-Won,Chung, Tae-Jin,Sin, Cheon-Sig,You, Moon-Hee 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-
ETRI has been developing the Ku and Ka band communications satellite payload system to provide the multimedia services, such as satellite Internet, DTH (Direct to Home), VOD (Video on Demand), and so on. ETRI in cooperation with domestic companies are under design phase for the payload system development. At a conceptual design phase, ETRI studies service requirement and system performance specifications. After analyzing system parameters, we confirm that system performance satisfies system requirement specification. This paper focuses on the conceptual design analysis to verify the system performance specification, especially EIRP, G/T, SFD, etc.
이모장착자 및 악교정술 시행 환자와 정상인과의 상악골, 하악골 길이의 비교에 관한 연구
홍성팔(Seong Pal Hong),조병욱(Byoung Ouck Cho) 대한구강악안면외과학회 1992 대한구강악안면외과학회지 Vol.18 No.3
It has been known that class Ⅲ malocclusion has various etiologic factors and characteristic maxillomandibular and dental relation. The treatment of class Ⅲ malocclusion is divied two type by treatment timing: early orthopedic treatment and late surgico-orthodontic treatment. Nowadays, it is popular for the surgerns to use the combination of orthodontic treatment and orthognatic surgery. To study the timing of treatment of growing skeletal class Ⅲ children, we selected normal 30 male, 30 female children and skeletal class Ⅲ 15 male children, 15 female children and skeletal Ⅲ 29 adult male, 29 adult female. Cephalometric radiograph was treated by single investigator and maxillary, mandibular length was measured. The results were as follows; 1. The maxillary length of normal group in both children and adults were larger than malocclusion group in statistically level (p<0.001). 2. The mandibular length class Ⅲ malocclusion group in female children and adult is larger than normal group in statistically significant level (adult: p<0.01, female children: p<0.001). 3. Max/mand. ratio were 0.73 in class Ⅲ male children, 0.71 in female children and 0.66 in class Ⅲ male adult 0.67 in class Ⅲ feamle. 4. Difference of maxillary and mandibular length were 29.06mm in class Ⅲ male children, 29.96mm in female children and 47.19 mm in class Ⅲ male adult, 42.06 mm in class Ⅲ female adult.
뇌 수술 직후 검사실로 이동하는 환자를 위한 정맥 마취의 유용성
김성기,박대팔,조영우,서일숙 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.4
Background : In most brain operations, the endotracheal tube is kept in postoperatively for airway maintenance during radiologic examinations. But the endotracheal tube causes tracheal irritation and hemodynamic changes. Inhalation anesthetics can not be administered during transport, and minimal concentration is exhaled for several hours after the end of inhalation. The present study was designed : (1) to determine the end tidal isoflurane concentration after the end of administration ; (2) to investigate the effects of intravenous anesthetics in patients with tracheal intubation during radiologic examination postoperatively. Methods : We selected forty adult patients who were scheduled for elective neurosurgical operation with postoperative brain CT (computerized tomography). The study was performed in 2 steps; in the step 1 (n = 10), end tidal isoflurane concentration was checked after ending inhalation. In the step 2 (n = 30), patients were divided into one of three groups according to anesthesia method; group I (using isoflurane), group P (change from isoflurane to propofol about an hour before operation end), group M (using midazolam instead of propofol, compared to group P). In each group, the frequency of bucking and incidence of hypertension were checked during postoperative radiologic examinations. Results : Minimal concentrations of isoflurane were detected in exhaled gas for about 2 hours after the end of isoflurane inhalation. The frequency of bucking was significantly lower in the group P and M than in group I (P = 0.002). In group P, the incidence of hypertension was significantly reduced compared to group M and I (P = 0.031). Conclusions : These results suggest that the change of anesthetic technique (from inhalation to intravenous) in the late period of operation, provides postoperative hemodynamic stability, a more comfortable state and minimal environmental pollution in comparison to inhalation anesthesia only. (Korean J Anesthesiol 1999; 37: 588∼595)