오이(Cucumis sativus L.) 떡잎의 노쇠화 관련 유전자의 발현 및 수분 스트레스의 영향 연구

이주연, 김대재 충북대학교 과학교육연구소 2011 과학교육연구논총 Vol.26 No.2

본문 참고

바닥輻射 煖房시스템의 熱傳達 特性

연인모,김대기,이세균 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.2

The object of this study is to investigate the thermal characteristics of heating system with floor radiation for residential building. As a first step, the thermal resistance of floor constructed with mortar and concrete has been studied while hot water is supplied through pipe under the floor surface. A heat transfer model of floor heating system which has natural convection and radiation from floor surface to the heating space has been developed to predict the heat transfer and the temperature of floor surface. Also, expriments have been performed and the results have been compared with those of heat transfer model. This study does not include all the heat transfer characteristics associated with typical heating system with radiant floor in detail. However, heat transfer modeling developed in this study can be a first step in design of comfortable floor temperature. Therefore, the results of this study can provide important informations to construct and optimize such a system.

Binding Energy of Oxigen and Methane Adsorbed on Bundles of Open-Ended Single-Wall Carbon Nanotubes

서주연,유대황,곽진성,황윤회,김형국 부산대학교 유전체물성연구소 2004 유전체 논문집 Vol.3 No.

The adsorption of oxygen and methane on the bundles of open-ended single wall carbon nanotube(SWNT) was studied using the volumetric adsorption qst was obtained from the adsorption isotherm measurements performed at different temperatures. The trend in the values of the methane isosteric heat of adsorption showed three regions, representative of the adsorption on the different types of adsorption sites. In case of oxygen, on the other hand, such distinguishable regions were not appeared in the N-qst graph. From the results of qst the binding energies of oxygen and methane adsorbed on open-ended SWITs were estimated.

Rat의 복강내에 투여한 5-fluorouracil-polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구

강대영,송규상,최정목,노승무,정경수,오정연,김진향,양준묵,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

For more effective intraperitoneal chemotherapy, the authers made 5-fluorouracil-polyglycolic acid composite disks(FU-PGA disks) with 5-fluorouracil and polyglycolic acid, a biodegradable polymer. We inserted the FU-PGA disk into the peritoneal cavites of Sprague-Dawley male rats, the control and three experimental groups; one FU-PGA disk insert group(300mg/kg), two FU-PGA disk insert group(600mg/kg), and three FU-PGA disk insert group(900mg/kg). The control group received a similar number of PGA disk inserts. A pharmacokinetic study was performed to measure the 5-fluorouracil concentration in the peritoneal fluid, blood, and tissues(liver, kidney and heart) at 24 hours, 72hours and 168 hours after insertion of the FU-PGA disk. Light and electron microscopic studies were done. The results were as follows: 1) The number of white blood cells and platelets decreased after FU-PGA insertion. The degree was proportional to the duration and amounts inserted. The change in the number of red blood cells varied slightly. 2) Light microscopically, slight changes were noted at 168 hours in the 3 disk insert group (900mg/kg). Mild fatty change and hepatocyte degeneration around the central veins of the liver were noted, with vacuolar degeneration in the proximal convoluted tubules of the kidney. 3) Electron microscopically,the liver showed focal increases of lipid droplets in the hepatocytes, and irregular nuclear membrane with focal nucleolar segregation of the fibrillar and granular elements. Also the double membranous structure of the hepatocytes and Kupffer cells was widened with bleb formation. The kidney showed wide separation of the nuclear double membrane in the proximal convoluted tubular cells and mesangial cells, with vacuolation and myelin figure formation in the mitochondria of the proximal convoluted tubular cells, at 72 hours and 168 hours in the 2 to 3 FU-PGA insert groups. The heart showed focal loss of cristae,vacuolation and myelin figure formation in the mitochondria of the 2 to 3 FU-PGA insert groups. In conclusion, despite the large amont of FU-PGA inserted, the histopathological changes in the liver, kidney and heart were slight, and consonant with the very low amount of 5-fluorouracil concentrations detected in the liver, kidney and heart. The above results suggest that the FU-PGA composite can serve as a new device for releasing drugs in a controlled manner and easily targeted to intraperitoneal organs. This device can improve the efficacy of intraperitoneal chemotherapy for gastric cancer.

마이크로 압전 엑츄에이터용 Sol-Gel PZT 박막의 두께 변화에 따른 특성

장연태,박준식,김대식,박효덕,최승철 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

Pb가 10% 과잉되고 Zr : Ti = 52 : 48 조성을 갖는 PZT sol이Pt(3500A˚)/Ti(400A˚)/SiO2(3000A˚)/Si(525㎛)기판 위에 스핀 코팅법으로 반복 코팅된 후, 450℃에서 10분, 650℃에서 2분간 반복 열처리되었다.이와 같이 다양한 두께로 적층된 박막은 각 시편에 대해 최종적으로 650℃ 30분 동안 어닐링 처리되었다.제조된 PZT 박막의 두께는 4100A*에서 1.75㎛사이의 4종이었다.이어서 스퍼터링법으로 Pt전극이 PZT 막 위에 증착되었다.제조된 PZT 박막의 결정 구조 조사를 위해 XRD, 그리고 미세 구조 및 전기적 특성을 알아보기 위해 FESEM과 P-E 이력 곡선이 각각 관찰되었다.4100A˚에서 1.75㎛까지 두께 중가에 따른 장비상의 포화 이력 한계로 잔류 분극(Pr)값이 25A˚u C/㎠에서 다소 감소되었다.측정된 X선 회절 결과에서 최초 4회 코팅시 perovskite 결정 구조로 성장한 결정립은 (111)배향이 우세하였으나, 두께가 증가됨에 따라 (111)/(110)값이 감소되었으며, 이를 통해 두께 증가에 따른 (111)배향성이 다소 감소됨을 알 수 있었다.이상의 결과로부터 제조된 PZT 박막은 큰 힘과 높은 내전압 특성을 갖는 마이크로 압전 액츄에이터에 적용될 수 있을 것으로 생각되었다.

지자기 센서를 이용한 차량 속도 검지에 관한 연구

정대연,강문호 선문대학교 2001 공학계열 논총 Vol.4 No.-

This paper addresses a MR(Magneto-Resistive) sensor based vehicle speed detector which has been developed as an alternative to the conventional loop detector most available on the road. Consisting of two MR sensors and voltage amplifiers, microprocessor, RF module for wireless data transferring, the proposed detector can offer essential traffic data such as vehicle volume and speed. At first, basic speed detecting performance of the detector was verified with a simple car moving simulator in laboratory, and then real world field test was performed to show the practical usefulness as an alternative to the loop detector

비소(Arsenic)에 의한 토양 오염과 복원기술

김대연,김정규 고려대학교 2004 생명자원연구 Vol.12 No.-

現代社會와 老人問題

金大淵 弘益大學校 敎育硏究所 1992 敎育硏究論叢 Vol.- No.8

都市새마을運動展開에 있어서 大學의 寄與方案 : 그 實踐事例를 中心으로 Laying Stressn its Practical Clases

金大淵,姜信雄 弘益大學校 敎育硏究所 1978 敎育硏究論叢 Vol.- No.1

The study is intended primarily for seeking the contribution plan of University for the development of Urban Saemaul Undong. The purposes of the study are: ⑴ to exhibit the actual factors of obstruction and the questions at issue, centering around the practical cases and the analysis of the actual conditions to be found, ⑵ to present the samples of the actual cases by examining its ample hope for success, and ⑶ to propose the efficiency plan for the Undong. * The study covers the following contents: ⑴ the actual factors of obstruction and the questions at issue were found, as a result of the Saemaul Service which was made at Mangwon-dong (including 22bans of 11 tong), Mapo-gu, Seoul and ⑵ The ample hope for success which was examined in the university Saemaul Undong, ⑶ The plan for the efficiency practice, ⑷ The concrete examinatiotn of the actual cases for practice in the Urban Saemaul Service, and ⑸ Reference to the characteristics of the urban society and the fruit, subject, and direction of Saemaul Undong. * Being based on the examination and the practice cases indicated above, the study offers the followings: ⑴ to promote the scientific research and the development of materials for the efficiency and practical plan in the Urban Saemaul Undong under assuming leadership of the research institute attached to universities or colleges and the driving council of the University Saemaul Undong, ⑵ to grasp the questions at issue and the improvement of the Undong according the evalution of practice in the Urban Saemaul Undong, ⑶ to reconfirm the attitude of an university student for the Undong and its practice and the role of university, ⑷ to establish the plan for making the sense of a community and the system for practice, building up the feeling professors, students, and officials are one flesh, ⑸ to promote the Saemaul Undong Service inside and outside school, organizing a group of the school Saemaul Undong. Service with the purpose of practicing the Urban Saemaul Undong Service, ⑹ to concentrate the Saemaul Undong Service on one area selected, ⑺ That one must adapt oneself to a community, looking into a community according to his major, ⑻ to be contributive to the spread of the base in Saemaul Undong, taking part in the Bansanhweui and the respect for the aged, ⑼ to make the best use of human and material resources of university, assisting neighboring area in its Saemaul Undong, and ⑽ to make the best use of professors' knowlege under their guidance.

특수효과가 있는 디지털 비디오의 컷 검출

김대환,최연성,고남영 群山大學校 1996 論文集 Vol.23 No.-

Parsing video content is an important first step in the video indexing process. This paper presents algorithms to automate the video parsing task and the presentation key-frame extraction. In this study, we propose a cut detection algorithm using linear coefficients of correlation from edge-map and analyze the existing cut detection methods. Experiments applying to real video clips confirm our methods. Video data modify it for dissolve effect which is fade-out and fade-in. Finally we design a browsing system for video data that use our cut detection algorithm.