합성섬유보강 콘크리트의 구속수축균열 제어특성연구

박제선,윤경구,이주형,최성용,김태환 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-

최근에 폴리프로필렌 섬유를 첨가하여 콘크리트의 인성을 증가시키고, 균열에 대한 저항성을 향상시키고자 하는 노력이 계속되어 왔다. 그러나 첨가된 섬유의 구조에 대한 이해부족으로 인하여 연구자들간에 실험결과에 대한 해석이 상이한 경우가 많았다. 이러한 연구의 일환으로 섬유의 첨가에 따른 건조수축 균열의 조절 가능성을 분석하기 위하여 섬유의 첨가에 따른 유동성과 건조수축의 변화를 조사하였다. 섬유의 첨가에 따른 유동성의 변화와 건조수축을 측정하기 위한 강제링 시편을 제작하였다. 본 연구에서는 섬유를 첨가한 콘크리트의 역학적 거동특성인 압축강도, 휨강도, 인성, 그리고 균열특성을 실험적으로 규명하고자 하였다. 본 연구는 강도 및 건조수축특성을 규명하기 위하여 수행되었고 섬유의 영향으로 인한 건조수축특성을 예견할 수 있다. Polypropylene Fibers have been used to increase the toughness of concrete and to increase the resistance to crack formation. However, there are many contradictory argument about the effectiveness of the fiber due to the lack of knowledge about the mechanism of fiber in concrete. In order to study the effect of fibers on possible crack control, the effects of fibers on workability and drying shrinkage have been studied. The workability change due to the addition of fibers has been studied, and full size concrete steel ring specimen have been cast at field to investigate the effect of fibers on the shrinkage properties. This laboratory have been performed to obtain the properties of pp fiber reinforced concrete such as compressive, flexural strength, toughness, slump, drying shrinkage crack and drying shrinkage characteristics. The present study was performed clarify the strength and drying shrinkage properties. From these results, we can expect the effect of the admixtures of polypropylene fiber for concrete and mortar about strength and drying shrinkage properties.

좌심실 수축기 기능장애를 동반한 양수색전증 1예

박대균,홍경순,두영철,한규록,오동진,유규형,임종윤,고영박,이광학,이영,송원근,김현태 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.8

사람태아 간적혈구형성에 따른 간세포의 변화

박영양,김경용,이원복,김동창 중앙대학교 의과대학 의과학연구소 1992 中央醫大誌 Vol.17 No.1

The ultrastructural development of fetal liver cells according to the activity of hepatic erythropoiesis was studied with 15 human fetal livers from 7 to 34 weeks of gestation. 1) The 1st state(7-8 weeks of gestation) : The nucleus of hepatocyte was oval with granular euchromatin evenly dispersed throughout the interior and prominent nucleoli. The hepatocytes often exhibited many mitochondria and short dilated rERs but no sERs and glycogen deposit. Two types of reticulum cells with intracellular organells developed with close relation with erythropoietic cells. The nucleus of the 1st type was similar with that of hepatocyte and the cytoplasm was full of well-developed multiayered rERs and numerous mitochondria. The nucleus of the 2nd type was irregular and has high electron-dense nucleoplasm. and the cytoplasm was packed with more developed multiayered rERs and oval mitochondria. 2) The 2nd state(9-22 weeks of gestation) : Most of hepatocytes differentiated well and exhibited numerous mitochondria and free ribosome, 5 to 6 layered rER, glycogen deposit, and there were sppearance of sER and hemosiderin in the cytoplasm. With age, the 2nd type reticulum cell became the majority and had more glycogen deposit and less rER. The space of Disse was well-developed but the sinusoidal wall still immature. 3) The 3rd state(23-34 weeks of gestation) : The majority of hepatocytes were mature cells. Reticulum cells, greatly decreasing with age, exhibited increasing lipid storage and decrease of mitochondria and rER. In summary, the maturation of hepatocyte and activity of reticulum cell may influence the hepatic erythropoiesis.

科學1의 學習指導와 評價의 標準化에 關한 硏究

朴載昊,鄭敬圭,鄭世泳 부산대학교 사범대학 과학교육연구소 1984 科學敎育硏究報 Vol.11 No.-

The model of evaluation of the sciencs lesson in the science section of junior high school was studied for the establishment of teaching method by the analysis of logical structure of the science lesson and learning practice. In teaching several detailed conditions were established by the judgement of learners exact readiness. It is shown in the survey of learning practice that although science teachers understand the essential of science they have some difficulties in the practical use of scientific knowledge. Several detailed conditions of evaluation of the science lesson were proposed and some items of evaluation of the science lesson were exemplified.

外傷性 橫隔膜 헤르니아 : A Report of Two Caess

朴永寬,李榮根,徐景弼,李寧均 現代醫學社 1968 現代醫學 Vol.9 No.4

Two cases of traumatic diaphragmatic hernia were operated on in this department during the past 12 months period. The. first case, a 14 years old girl, had laparotomy for intestinal perforation inflicted by traffic accident at another hospital. After suturing the perforated jejunum, she was transferd to this hospital due to coincidental rupture of the left leaf of the diaphragm. Prompt reposition and repair of the diaphragm was done utilizing transthoracic approach. The second case was a 26 years old man, who was admitted with severe abdominal pain and vomiting. Two years ago he was stabbed with a knife in the left lower lateral chest wall. By chest P-A and barium enema study stomach and colon were noted in the left bemithorax. A round defect, 3.5 cm in diameter, was found in the muscular portion of the left diaphragm, which was repaired after reposition of the herniated abdominal viscera. Transthoracic approach was used in this case, too. Both cases were discharged after uneventful recovery.

Analysis of Genetic Diversity of Korean Wheat Cultivars Using Microsatellite DNA Polymorphisms

Park,Yong-Jin,Cho,Gyu-Taek,Ma,Kyung-Ho,Lee,Sok-Young,Lee,Jung-Ro,Kim,Young-Chang,Cho,Eun-Gi,Kim Chang-Yung,Nam,Jung-Hyun,Rao,V,Ramanatha,Kang,Hee-Kyoung 한국자원식물학회 2004 Plant Resources Vol.7 No.2

Genetic background and phylogenetic relationships among 20 Korean wheat cultivars were assessed using microsatellites after amplifying with 13 SSR primer pairs. Average allele number per primer pair was 3.36. Genetic similarities for every pair of cultivars ranged from 0.42 to 0.97, with 0.69 of overall average. Korean cultivars were divided into two major groups based on microsatellite DNA polymorphisms. Group I consisted of relatively old cultivars developed until 1970s, and group II contained the recent cultivars developed during 1980s and 1990s. Amongst old elite cultivars/lines, ‘Yukseung 3’, ‘Norin 12’ and ‘Norin 72’ contributed most to the genetic background of cultivars belonging to group I, and ‘Norin 4’, ‘Norin 12’, ‘Norin 43’ and ‘Norin 72’ to group II, respectively. The phylogenetic relationship of Korean wheat cultivars was in accordance with the genealogical data of each cultivar. The genetic background of each cultivar was assessed from the point of breeding and germplasm management such as variety identification and duplicated accessions for assisting in developing a system for the registration of new variety based on the molecular characterization in future.

항암제 AG60이 흰생쥐 위점막 상피세포의 DNA합성에 미치는 영향 : 자기방사법적연구

박경호,안의태,고정식,하상선,한영복,정영신,홍은경,유보림,김상건,이경영,강종구 대한해부학회 1999 Anatomy & Cell Biology Vol.32 No.1

잠재성 소염진통작용이 있는 Hydantoin-3-Acetic Acids 및 그 유도체 합성

권순경,박명숙,신영식 德成女子大學校 藥學硏究所 1991 藥學論文誌 Vol.2 No.1

Through the Bucherer-Bergs method, new 5-alkylthio (sulfonyl)-methyl-p-x-phenylhydantoins were prepared. Hydantoin-3-acetates were synthesized by the reaction of the hydantoins and ethyl chloroacetate and through the subsequent hydrolysis of the 3-acetates with dilute sodium hydroxide hydantoin-3-acetic acids were obtained. These products are expected to exhibit antiinflammatory and analgetic activities.

미국 및 캐나다 地域에서 栽培, 販賣되고 있는 무궁화 品種에 關한 硏究

沈慶久,河有美,朴永洙,金健澔 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.1

This sutdy was carried out to examine the present distribution and status of Hibiscus cultivars by analyzing the US and Canadian market. The obtained results are summerized as follow : 1. At present, a total of 28 cultivars of Hibiscus are on the market. Among these, twenty four are diploids and four are triploids. The hottest cultivars in the market is a triploid `Diana' sold by 21 different companies. It is followed by 'Ardens' and 'Jeanne d'Arc', following `Red Heart', `Blue Bird', 'Woodbridg e', and 'Helene'. 2. As a conservation or display purpose, several cultivars are ketp in three different arboretums in the US. These include 5 cultivars, `Blue Bird', `Celestial Blue', `Collie Mullens', 'Lucy', and `Ruber Plena', in Arnold Arboretum, and one each, 'Variegatus', at the USDA national arboretum and, `Banner' at Morton arboretum in Chicago. 3. The avarage price for triploid cultivars is $6.00 for each seedling. The recently developed cultivars like 'Helene' and 'Minerva' cost $16.00 per seedling possibly due to their plant patent right. Other cultivars produced by cuttings cost $2.00 to $ 3.00 per seedling. 4. In Canada, there are nine cultivars on the market; being diploids and one triploid, `Diana'. 5. As for the distribution of different cultivars by climatic zone, twelve cultivars are being grown in temperate area like Ohio and Iowa. However, many other cultivars are being cultivated in wamer Southern state like Galifornia. Five cultivars are reported to grow in the relatively cool area like Wisconsin and Minnesota. Even in cold area like Canada, 5 cultivars such as `Anemonaeflorus'(2n), `Ardens'(2n), 'Jeanne d'Arc'(2n), and `Luky'(2n), and 'Paeoniflorus'(2n) at Ontario and there is colder than Hamkyung Do in north Korea.

揷木用土 및 Peat plug利用이 만생종 왜철쭉의 揷木에 미치는 영향에 관한 硏究

沈慶久,河有美,朴永洙 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2

This study was carried out to propagate Rhododendron Satsuki hybrid `Bemi-Kirishima' through soft-wood cuttings in the closed mist room in connection to different concentrations of IBA, cutting media, Peat plug. The results were as follows: For the time of cutting, there were noticeable differences in the cutting on June 21 and July 8. Out of cutting media tested, the media prepared by mixing 50% vermiculite and 50 perlite(v/v ) on the treatment of IBA 1000ppm gave 100% rooting and the longest root length. Rooting of plants in the Peat plug was 93.5% and they uniform root length. In addition, Peat plug provided more space for cutting than cutting basket. It was possible that we got good cuttings and therby mass propagation through Peat plug.