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승모판대치술후 도플러 심초음피를 이용한 인공 판막의 종류에 따른 최대혈류속도와 평균혈류속도에 관한 연구
박선우,김권배,김윤년,김기식 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2
The conventional non-invasive and invasive technique have limitations in evaluating cardiac prosthetic valves and artificial valves. We have used continuous wave Doppler echocardiography to evaluate 48 patients with tissue and mechanical mitral valves implanted within 4 months prior to examination. The results are as follows. 1) Of these patients, male are 28. The mean ages of male are 35.60 (yr) and female are 41.82. 2) The differences of peak and mean velocities of prosthetic acardiac valves between male and female are not significant, but the differences of valvular size between male and female are significant(male:31.00±1.30(mm), female:29.36±2.11, p<0.01). 3) The difference of size and flow velocities between mechanical (Edwards-Duromedics) and tissue(Ionescue-Shiley) valves are not significant, but the ages of patients with mechanical valves are significantly lower than tissue valves(mechanical valve; 34.05±11.28, tissue valve; 43.62±11.26, p<0.01). 4) The differences of flow velocities between mechanical and tissue valves, sizes of which are 31mm, are significant statistically (peak velocity; 130.15±24.59 vs 110.00±19.41, mean velocity; 74.49±23.14 vs 51.38±12.71, p<0.01). 5) The sizes of valves are larger, the peak and mean velocities are lower, but it is not significant statistically. The results indicated that Doppler echocardiography is a useful method for evaluating function of prosthetic valves.
고속 ATM 네트워크를 위한 통신 프로토콜에 관한 연구
박기현,안기중,이상배,강문식 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1
In this paper, a new network protocol, AD²R(ATM Distributed queue Dual Ring), is proposed for high-speed communication. This protocol is a slotted using ATM scheme. With the mathematical analysis and computer simulation, it is shown that proposed protocol is appropriate for the high-speed communication. Also, it is verified that the AD²R network performance is enhanced by using the ring topology, the destination release and the distributed queue scheme.
Cryptosporidium baileyi감염 병아리에 있어서 Fabricius-낭의 조직병리학적 변화
박배근,조성환,윤원기,김현수 충남대학교 수의과대학 동물의과학연구소 1995 動物醫科學硏究誌 Vol.3 No.-
Two-day old male chickens(DEKALB-Warren, Sex-Sal-Link) were inoculated orally with 2×10^6 oocysts of Cryptosporidium bailyei. Age-matched birds served as controls. A small number of oocysts were first recognized in the feces of chicks on day 3 post inoculation(PI). The OPD for the chickens increased with the lapse of days, reached a peak on day 9 PI, decreased rapidly thereafter, and became negative on days 33 PI. The protozoa had a prepatent period of 2 day and patent period of 3-32 days. On day 10 PI, infections were very heavy, in fact, there was a vitural monolayer of parasites in the microvillus region of the bursa of Fabricius(BF). Histopathological lesions in BF were characterized by severe eosinophilic infiltrates under the epithelium, loss of FAE and epithelium. The eosinophilic infiltrantes were detected in the follicles on day 15 PI. On days 27 PI, follicles were degenerated and necrosised. Mast cells were recognized in the epithelium on day 10 PI, reached a peak on day 43 PI and then rapidly decreased. Location of mast cell was matched with the region of parasited epithelium. Although the cryprosporidia was not detected in the epithelium of BF on day 59 PI, the mucosal change persisted accompanied by hyperplasia and metaplasia. The follicles were normally recovered or partially necrosised on day 59 PI.
박기배,한상도,이상호,Hua, Yang,김명녕 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
Thick film type oxygen sensors based TiO_(2) doped with WO_(3)(5.0[wt%]) were investigated. TiO_(2) powders were sintered by sol-gel processing method in air atmosphere. Particle sizes of WO_(3) doped TiO_(2) prepared with conventional and nano crystal process were approximately 1[μm]~0.1[μm] and 20[nm] respectively. The sensor prepared with small size WO_(3)-TiO_(2) powders showed more enhanced oxygen sensing characteristics
한국 재래 우 및 산양 위장관의 somatostatin cell에 대한 면역조직화학적 분포
조성환,김현수,박배근,윤원기,손화영 충남대학교 수의과대학 동물의과학연구소 1995 動物醫科學硏究誌 Vol.3 No.-
The relative frequency and distribution of somatoatatin immunoreactive cells were investigated by the immunohistochemical method in the gastrointestinal tract of the Korean native cattle and goat. The results obtained were as follows: In the Korean native cattle, somatoststin cells were a few in the pyloric and duodenal region and rarely seen in fundic region, jejunum, ileum, cecum, proximal colon, central coil, distal colon and rectum. In the Korean native goat, somatostatin cells were the most numerous in the pyloric region and the next in the fundic region. And they were a few in the duodenum, not detected in the cecum and sparse in the jejunum, ileum, proximal colon, central coil, distal colon and rectum.
돼지생식기호흡기 증후군(PRRS) 바이러스 감염시킨 돼지 기관의 병리학적 관찰
조성환,김현수,윤원기,전무형,류시윤,박배근,손화영,김무강 충남대학교 수의과대학 동물의과학연구소 1996 動物醫科學硏究誌 Vol.4 No.-
The porcine reproductive and respiratory syndrome virus was inoculated into swine tracheal organ culture. The ballooning degeneration of the tracheal ciliated epithelium and a decrease of ciliary activity from the tracheal organs infected with PRRS virus were observed one day post-infection(PI). Tracheal epithelium showed degeneration and focal necrosis 2 days PI. Epithelial necrosis and loss of cilia and epithelial cells became more severe 3 and 4 days PI. An entire loss of cilia and epithelial cells were recognized 4 days PI, however, control tracheal organs were normal during the period of the experiment except a little decrease of ciliary activities with time..
조성환,류시윤,김현수,박배근,김덕환,손화영,윤원기,신창호 충남대학교 수의과대학 동물의과학연구소 1999 動物醫科學硏究誌 Vol.7 No.-
Pathological observations were examined after abdominal inoculation in 7∼8㎝ sized flounder (Paralichthys olivaceus) with 1X10^7 cfu/㎖ of Streptococcus faecalis. The infected flounder were clinically observed and weighed a fish body at 0, 5, 10, 15, 20, 25, 30 days post inoculation. In infected group, mortality were 70% and feed efficiency were 7.2%. In non-infected group, mortality were 10% and feed efficiency were 18.2%. Macroscopically, the significant lesions were characterized by protrusions and opacity of the eyes and ulcer of the caudal pecuncle. Histopathologically, the lesions were observed a degeneration. necrosis and inflammatory cells in muscle of the caudal peduncle and a degeneration and necrosis of the rod cells and detached retina from the black pigmented layer