비부착 PS콘크리트 구조의 시간의존적 특성을 고려한 비선형 해석에 관한 연구

최정호;김운학;박재근 한경대학교 2008 論文集 Vol.40 No.-

This paper presents a comparative study on nonlinear analysis of the unbonded PSC structure considering time-dependent effect. For developing a finite element analysis program, an unbonded PS tendon model which can represent straight or curved unbonded tendon is proposed. The F.E. analysis program, named RCAHEST(Reinforced Concrete Analysis in Higher Evaluation System Technology), is used. Material nonlinearities of cracked concrete are taken into account by tension, compression, and shear models. And nonlinear material models for reinforcing and prestressing steels are included. These models work with models for time-dependent effect such as aging, creep and shrinkage of concrete and stress relaxation of prestressing tendon. The developed finite element analysis program is verified by comparison with reliable experimental results.

제주도산 가무락, Cyclina sinensis의 생식주기에 관한 조직학적 연구

이정재,조운삼 제주대학교 해양연구소 1985 해양자원연구소연구보고 Vol.9 No.-

급성 신우신염이 선행된 Escherichia coli 농흉 1예

차치운,조준형,김미진,오윤정,연재우,이성규,오미정,채지영,김수연 대한감염학회 2009 감염과 화학요법 Vol.41 No.5

We experienced a case of acute pyelonephritis which progressed to Escherichia coli bacteremia and later complicated by empyema in a 65-year-old female. She was successfully treated with intravenous antibiotic therapy and percutaneous drainage of empyema.

濟州道産 가무락, Cyclina sinensis의 生殖週期에 關한 組織學的 硏究

李定宰,趙雲三 濟州大學校 海洋資源硏究所 1985 해양과환경연구소 연구논문집 Vol.9 No.-

濟州道産 가무락, Cyclina sinensis의 生殖巢 構造, 生殖細胞形成過程 및 生殖過期를 光學顯微鏡 및 電子顯微鏡을 使用하여 調査하였다. 1. 生殖巢는 內臟囊의 肝中腸腺 上端에서 足部까지 外側의 大部分을 싸고 있으며 卵巢는 많은 卵巢小囊으로, 精巢 또한 小管狀의 精巢小囊으로 構成되어 있으며 이들 小囊의 內脫上皮가 生殖細胞의 機能을 한다. 2. 生殖巢 外壁은 420∼600㎛로 매우 두꺼우며 上皮層은 30∼40㎛의 單層圓柱상계로 構成되어 있고 이들 上皮層 下方에는 50㎛두께의 結綿纖膠原纖維와 筋纖維가 緻密하게 結合되어 있으며, 下方으로 80㎛두께의 立方形 粘液腺細胞層과 上下層은 從으로, 中層은 橫으로 排列된 結綿纖膠原纖維와 筋纖維가 260∼430㎛의 두꺼운 層으로 되어있다. 3. 未分化間充織과 好酸性顆粒細胞들은 生殖巢 및 生殖細胞형성과 發達에 管養을 供給하는 一種의 管養細胞로 간주된다. 4. 卵母細胞가 70㎛ 前後로 成長하여 卵柄에서 離脫되어 完熟卵의 크기는 90∼120㎛ 前後였다. 5. 卵母細胞의 卵膜과 核膜은 二重膜狀 構造이며, 細胞質內의 卵黃顆粒은 皮質層 內側으로 擴散되며, 脂質顆粒은 核膜 附近에서 出現하여 皮質層으로 分散되었다. 6. 完熟精子의 頭部는 約 5㎛, 尾部는 20㎛ 內外로서 前端의 尖體는 電子密屠가 相異한 두 區域으로 區分되고 尖體와 核 사이에 透明腔이 存在하고 鞭毛의 軸絲構造는 9+2型이며 4個의 球型 mitochondria가 中心體를 둘러싸고 있다. 7. 生殖巢의 發達段階는 分裂增殖期(1∼4月), 成長期(3∼6月). 成熟期(5∼8月), 放出期(7∼9月初), 退化期(9∼12월), 回復期(12∼2月)로 區分할 수 있었다. 8. 産卵期는 水溫이 20℃ 以上으로 上昇하는 7月 初旬부터 9月 初旬으로, 産卵 最盛期는 7月 中旬부터 8月未 사이였다. 9. 雌雄同體는 調査材料 390 個體中 8個體였다. The structure of gonad, gametogenesis and the reproductive cycle of the clam, Cyclina sinensis were investigated mainly employing photomicrography and electron micrography. The materials were sampled monthly at Seongsanpo, Cheju Island from October 1982 to September 1983. 1. The gonad is located between the mid-intestinal gland in the visceral sac and the connective tissue of the foot. The ovary is composed of a number of ovarian sacs. The testis is composed of a number of seminiferous tubules, which form the tubulan structure, and the epithelium of the tubule has the function of germinal epithelium. 2. The outer wall of the gonad is 420-600㎛ thick, and the epithelial layer consists of simple columnar epithelial cells, which are 30-40㎛ thick. Under the epithelial layer are sequentially collagenous fiber layers, mucous gland cells fibromscular capsules compacted by collagenous fibers and muscle fibers. These thicknesses are 50㎛, 80㎛ and 260-430㎛ respectively. The upper and lower fibromuscular capsules are arranged of vertically, and the middle fibromuscular capsules are arranged of longitudinally. 3. Undifferentiated mesenchymal tissue and eosinophilic granular cells function as nutritive cells in the formation and development early stage of germ cells. 4. The oocytes reach approximately 70㎛ in diameter seceded from the yolk stalk, the mature eggs were about 90-120㎛. 5. The plasma membrane the uncleus membrane of oocytes are composed of a double membrane. Accumulation of yolk granules in the cytoplasm begins in the cortical layer and diffusion occurs outside the nuclear envelope and diffuse towards the corticalilayer. 6. The head of the spermatozoa is approximately 5㎛ in length and its tail is about 20㎛. The conical acrosome at the distal part of the head is distinguished by two regions with different electron densities. There is a clear space between the acrosome and nucleus. The flagellum of the tail consits of nine pairs of microtubules at the periphery, on e pair at the center fiber, and four spherical mitochondria form the paranucleus around the centrioles. 7. The development process may be divided into six succesive stages : multiplication (January-April), growing(March-June), mature(May-August), spent(July-eary September), degenerative(September-December) and recovery stages(December-February). 8. Spawnig of C. sinensis occurs from early July ot early September when the sea water temperature was normally above 20℃ and its peak spawing occured from late July ot August. 9. The hermaphroditic were eight individiuals among the 390 individuals examined.

티타늄 레이저 용접부의 기계적 성질 평가

이중재,김길수,안승근,배태성,박찬운 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.2

This study was performed to examine the effects of laser output energy on the mechanical properties of laser-welded titanium joints. Titanium rods of 3 ㎜ in diameter were perpendicularly cut to 30 ㎜ in length for the laser welding. Two rods were fixed to each other with a jig and welded vertically using a Nd:YAG laser at output current of 210-270 A. The penetration depth of the laser beam against the titanium was measured with the changes of output current, pulse duration, and spot diameter. Mechanical tests included tensile testing and Vickers microhardness of the joints. Tensile testing was performed at the crosshead 00speed of 1.0 ㎜/min and a gauge length of 30 ㎜ with a universal testing machine. Vickers microhardness was mesured under 9.8 N load for 15 seconds. The results obtained were summarized as follows; With increasing the output current, the penetration depth of the laser to titanium was increased. Tensile strength values of laser-welded groups were the relatively higher than that of non-welded parent material group. There were significant differences in tensile strength between the specimens of laser-welded at output currents 250 A, 270 A and non-welded parent material group(p<0.05). Microhardness values were increased in the heat-affected zone. Brittle fracture regions were observed in the specimens of laser-welded at output currents 270 A.

초등학생의 식습관과 영양지식 및 건강상태 조사

박미정,박금순,박운제 동아시아식생활학회 2003 동아시아식생활학회지 Vol.13 No.6

This study was conducted to investigate the food habit, nutrition knowledge and health status of elementary school students in Kyung-buk area. As for dietary pattern, 65.8% of students ate breakfast and 82.9% ate dinner on a dally basis. Their main dish for the meal was boiled rice with soup and this combination accounted for 60.3% of the breakfast items and 67.8% of the dinner items. Students in both rural and urban areas had dinner more regularly than breakfast. Overall knowledge on nutrition was 7.31 points out of 10. Urban students earned 7.33 while rural students did 7.29. Out of the maximum of 20 points, the overall grades on physical health were 15.57. (15.44 in rural areas and 15.70 in urban areas) As a result of their spiritual health condition, rural children recorded 6.63 point and urban children recorded 6.81 point on a 10 point scale. Furthermore, 32.8% of the children of the respondents had spiritual awareness phenomenon. The better the understanding of nutrition, the sounder mind and physical health stemed from the good dietary habits. Also the data showed that relatively young parents had better dietary habits than the older ones.

WORDPROCESSOR의 교육적 활용 방안

박영태,정재운 동아대학교 인문과학대학 인문과학연구소 1995 인문과학연구 Vol.- No.2

The purpose of this study is to make plans to activate use of word processor as an educational tool. Four possible ways of using the word processor as an educational tool are presented as follows: First, word processor can be used as a tool for accomplishing educational objectives. Second, word processor can be used as a tool for reorganizing and managing the subject matter. Third, word processor can be used as a media for presenting the subject matter. Especially, word processor with data viewer can be used in place of blackboard. Fourth, word processor can be used as a tool for testing.

노외핵계측계통 직류전원공급장치의 내환경 검증에 관한 연구

김성영,정운관,엄재법 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.1

According to the procedure of Equipment Qualification on this study, It shows that The DC Power supply of safety Class 1E which will make use of Nuclear Instrumentation System in the Ko-ri 3 & 4 unit, is the example of Equipment Qualification establish a fact that is able to have safety function executed, and can be confirmed on the Environmental Qualification that is able to have application to the Ko-ri Nuclear Power Plant. It hopes that the procedure to present on this study and the definite example, for the Equipment Qualification to have large expense in the domestic manufacturing industries that localized the mini-control component used in the Nuclear Power Plant depends on the import mostly, are large cooperation in the domestic manufacturing industries of the field of Nuclear Power industry.

식도암 병기 결정에 있어서 초음파내시경의 유용성

이화영,김재준,김영호,성인경,손희정,이풍렬,고광철,백승운,이종철 大韓消化器病學會 1998 大韓消化器病學會誌 Vol.32 No.2

금식시 흰쥐 소장 점막 유당분해효소에 대한 갑상선 호르몬의 영향 및 이의 유전적 조절 기전

이국래,이동호,이한주,윤정환,김재규,정운태,정현채,송인성,김정룡 大韓消化器病學會 1996 大韓消化器病學會誌 Vol.28 No.6