마우스에서 자외선조사에 의한 피부주름형성에 대한 생약추출물의 억제효과

구성근, 배부희, 허진주, 미가, 강봉수, 김준형, 남상윤, 윤영원, 김종수, 이범준 충북대학교 동물의학연구소 2008 Journal of Biomedical and Translational Research Vol.9 No.3

본문참고

‘바람’의 개념에 대한 초등학생들의 인식도와 오개념 유형 분석

부덕현,홍승호 이화여자대학교 사범대학 교과교육연구소 2008 교과교육학연구 Vol.12 No.1

This study is aimed at investigating the patterns of the misconception of 'wind' taught in the science subjects of elementary curriculum and its formation process, correcting them anddeveloping them into right conception. In order to conduct this research, 107 students in urban and 100 students in rural are chosen among 6th grade elementary school students in Jeju province. The earth unit about 'wind' in the elementary science textbook are analyzed, and questions about scientific conception and their misconception are chosen. The followings are the analyzed results through survey. According to the results from students' misconception about the concept of 'wind' throughthe survey, more than 30% of students seem to show the misconception in the 7 questions outof 18 questions. The reasons of the misconceptions were classified into an immature cognitive development, difference in experience of individual, generalization by hasty decision and deduction, difficulty of question, textbook and so on. When urban students and rural students are compared, the urban students have a higherrate of misconception. The reason why students have such a high rate of misconception is that the rural students usually get knowledge through 'their own experience', and the urbanstudents normally get knowledge through 'private academic school, some books and so on.' Itmeans their surroundings have a great impact on their concept formation. When the differences of misconception between both gender about 'wind' are analyzed,female students have a higher rate of misconception. Male students are likely to have moreinterest in science than female students, so they have more chances to do kinds of outdooractivities than them. 본 연구는 초등과학 지구영역의 ‘바람’에 대한 개념 정도와 오개념 유형을 조사하였다. 이를 위하여 제주도내 시지역과 농촌지역 초등학생 207명(남학생 103명, 여학생 104명)을 연구대상으로선정하였다. 검사도구를 개발하기 위하여 초등과학의 ‘바람’과 관련된 단원을 분석하여 과학적 문항과 오개념 문항들을 추출한 다음, 설문 조사를 통하여 그 자료를 통계 분석하였다. 주요 결과를보면, 전체학생에서 50% 이상의 오답율을 갖고 있는 문항은 5개로 나타났으며, 지식출처는 ‘과학시간 때 선생님에게 배워서’가 가장 높게 나타나 학교 교육 환경이 주로 영향을 미치고 있음을 알수 있었다. 또한 남학생 그룹과 여학생 그룹간의 비교에서는 총 18개의 문항 중 3개의 문항에서남학생과 여학생 간에 개념 정도에 있어서 유의한 차이가 있었다. 남학생은 여학생보다 자연환경에 접할 기회가 많고 활동이 많아 ‘바람’에 대한 과학적 개념이 높다고 판단된다. 그리고 도시학생과 농촌학생 간의 비교에서는 도시학생들이 농촌학생들보다 비교적 오답이 더 높게 나타났다. 문항별로 분석해 보면 지식위주의 문항에서는 도시학생이, 자연에서의 경험을 바탕으로 하는 문항에서는 농촌학생들이 높은 과학적 개념을 가졌다. 본 연구에서 ‘바람’에 관한 개념의 대부분이 자연현상에 관한 내용이므로 가시적으로 느끼기에는 어려움이 많고 정의적 속성도 인지될 수 없는 추상적인 것으로 인하여 오답이 높게 나타났다고 볼 수 있다. 따라서 일선에서 지도하고 있는 교사들은초등학생들이 갖고 있는 ‘바람’에 관한 오개념의 유형을 잘 파악하여 이를 교정하려는 연구가 필요하다고 생각된다. 이를 위해서 교사는 가급적 가시적인 탐구활동이나 여러 가지 예를 통한 이해,모둠별 학습을 통한 토의, 개념변화를 위한 적절한 갈등 유발 등의 학습을 진행하여 해소시켜 나가야 할 것이다.

肉鷄後期飼料의 給與時期가 鷄肉의 理化學的 性質에 미치는 影響 : 貯藏期間別에 따른 脂質含量과 脂肪酸造成의 變化 Changes in lipid contents and fatty acid compositions as the pass age of storage time

朴成振,尹東根,朴久富 진주산업대학교 1985 論文集 Vol.23 No.-

後期飼料를 3주령부터 조기에 급여한 9주령 Hubbad鷄肉의 3부위 근육을 공시육으로 하여 4℃에서 저장하면서 경시적(도살직후 저장후 2일 4일 7일)으로 지질의 함량을 추출하고 지방산의 조성을 GLC로 분석한 결과 다음과 같은 결과를 얻었다. 1. 지질함량은 도살직후 대퇴부위가 2.67%로 가장 높고 흉심부가 2.38%, 근위 1.28% 가장 낮았으며, 저장기간에 따른 지질함량의 변화는 3부위 모두 저장기간의 경과에 따라 지질함량이 감소하였다. 2. GLC로 분석한 지방산은 3부위 모두 myristic acid(14:0)로 부터 arachidonic acid(20:4)까지 10種을 분리 동정하였다. 3. 함량이 제일 높은 지방산은 세부위 모두 불포화 지방산인 Oleic acid로 40.7~45.5%였고 다음 Palmitic acid로 20.5~27.9%였으며 linoleic acid는 6.9~18.3%로 타육류에 비해 필수지방산인 linoleic acid의 함량이 높았다. 4. 3部位 모두 저장시간이 경과함에 따라 포화지방산의 함량이 증가되고 불포화지방산의 함량은 상대적으로 감소되었다. The meat cut 3 parts of leg, breast and gizzard of broiler-Hubbard at 9 weeks fed early finisher diet from 3 weeks were stored at 4℃ for four levels, immediately after slaughtering, 2 days, 4 days and 7 days after storing in order to extract lipid contents and fatty acid compositions was analyzed by the GLC method. The results obtained in this experiment were summarized as follows: 1. Lipid contents were the highest with 2.67% in the leg immediately after slaughtering and the lowest, with 1.28% in the gizzard. Fatty acid compositions were decreased in all the three parts as the storage time passed. 2. Ten fatty acids from myristic acid(14:0) to arachidonic acid(20:4) in all the there parts were identified by GLC. 3. The highest fatty acid was oleic acid with 40.7 to 45.5% and the next, palmitic acid with 20.5 to 27.9%. Linoleic acid was higher with 6.9 to 18.3% in broiler-Hubbard then in the other broiler. 4. As the storage time passed, saturation fatty acid increased and unsaturation fatty acid decreased relatively.

강섬유보강 콘크리트 슬래브의 내력 및 균열특성에 관한 실험적 연구

박승범,조광연,장석호,김부일 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

This Study is aimed to investigate the effect of load and deflection on steel fiber reinforced concrete slab. Slabs were made with Hooked and Straight types steel fiber and compared a change of steel fiber contents and fiber type. Test were carried out to evaluate the first crack load, maximum load and deflection of slab. AT this result, the first crack load, maximum load and energy absorption capacity were increased remarkably as steel fiber contents were increased. And we found that the deflection of slab at same load were decreased as steel fiber contents were increased, too. As the aspect ratio was increased, the first crack load, maximum load and energy absorption capacity were increased.

방과후 학교의 운영체제 개선 방안 연구

이승미,김대영,홍후조,민부자 한국교육과정학회 2007 교육과정연구 Vol.25 No.3

土當歸, 日當歸 및 中國當歸가 Hydrocortisone acetate로 유발된 瘀血 病態에 미치는 影響

송승현,서부일,김호경,박지하 대한본초학회 2004 大韓本草學會誌 Vol.19 No.1

Objectives : This study was performed to compare the effect of Angelicae Gigantis Radix, Angelicae Acutilobae Radix and Angelicae Sinensis Radix extract on model of blood stasis in rats. Methods : Except for the normal group, hydrocortisone acetate(HA;%mg/kg in ethanol, IM) was injected to induce experimental blood stasis model for 1 weeks and each extract was administrated after lhr following HA injection for lweek. We measured the hematocrit, the platelet count, the prothrombin time, levels of fibrinogen and RBC counts in rat s blood. Results : Angelicae Gigantis Radix, Angelicae Acutilobae Radix group showed significant increase of hematocrit in comparison with that of the control group. Angelicae Gigantis Radix, Angelicae Acutilobae Radix and Angelicae Sinensis Radix group showed significant increase of the platelet count in comparison with that of the control group. Angelicae Gigantis Radix group showed significant decrease of prothrombin time in comparison with that of the control group. Angelicae Gigantis Radix, Angelicae Acutilobae Radix and Angelicae Sinensis Radix group showed significant increase of fibrinogen in comparison with that of the control group. Angelicae Sinensis Radix group showed significant decrease of RBC counts in comparison with that of the control group. Conclusions : Reviewing these experimental results, it appears that Angelicae Gigantis Radix, Angelicae Acutilobae Radix and Angelicae Sinensis Radix have similar pharmaceutical efficacy on model of blood stasis. In particular Angelicae Gigantis Radix showed good efficacy in comparison with Angelicae Acutilobae Radix and Angelicae Sinensis Radix. Therefore further additional study should be conducted to elucidate in depth the pharmaceutical efficacy of these.

메틸水銀의 心筋毒性에 대한 苦蔘의 影響

송호준,하대호,유교상,박승택,이강창,서부일 대한본초학회 2002 大韓本草學會誌 Vol.17 No.2

Objectives : To evaluate the toxic effect of methylmercuric chloride(MMC) and the protective effect of Sophorae Radix(SR) in cultured mouse myocardial cells, cytotoxicity was measured by MTT assay Methods : Cultured myocardial cells were incubated for 72 hours in the media containing 5~40 ㎛ concentrations of MMC. And also, the protective effect of SR was determined by sulforhodamine B(SRB) for protein sythesis and radioactive assay for DNA sythesis in these cultures. Results : Cell viability was significantly decreased in a dose-dependent manner after cultured myocardial cells were exposed to 20 ㎛ MMC for 72 hours. In the neuroprotective effect of SR on MMC-induced cytotoxicity, SR blocked the MMC-induced myotoxocity in these cultures. Conclusion : It suggests that MMC is toxic against cultured mouse myocardial cells and SR is effective in blocking the meurotoxicity induced by MMC.

흰등멸구에 對한 水稻新品種, 系統의 抵抗性機作에 關한 硏究

金正和,李時雨,崔承允,鄭富根 서울大學校 農科大學 1982 서울대농학연구지 Vol.7 No.2

A series of experiments were conducted to evaluate the varietal differences in resistance of Korean new rice cultivars to the white-backed planthopper(WBPH), Sogatella furcifera HORVATH(Ⅲ). The number of rice cultivars tested were twenty-one from the Office of Rural Development (ORD), and eight from the College of Agriculture, Seoul National University(SNU). The nature of their varietal resistance of rice to the WBPH were studied in terms of the seedling reaction, the insect population build-up, and honeydew excretion with feeding activity. (1) Seven cultivars out of the 34 cultivars tested indicated resistant reaction in seedling test; SNU-020713, -1768, -1770, -011063, -01165, -01166, and -01167. (2) The feeding preference of the WBPH adults and nymphs was higher on the susceptible Jinheung than on the test cultivars, and their feeding preference did not steadly coincide with the seedling reaction to the WBPH. (3) The ovipositional preference studies indicated that the insects exhibited distinctly different preference for different cultivars, but their tendency was not steady; for example, the cultivars Milyang-48 and SNU-01701 compared with Jinheung were significantly prefered for oviposition despite showing the susceptible seedling reaction and the cultivar SNU-01702 was significantly less prefered for oviposition than Jinheung,even though they were all susceptible in seedling reaction. (4) The population build-up of WBPH was smaller on the resistant cultivars (R-check) than the susceptible ones. (5) Post-embryonic developmental period was relatively shorter on the susceptible cultivars, but it was not always true. (6) The adult emergence rate was relatively higher on the susceptible rice cultivars than those on the resistant and moderate ones. (7) Differences in sex ratio of the WBPH on the susceptible and resistant cultivars could not be made sure due to the small number of adults tested. (8) The amount of honey-dew excreted was measured using the ninhydrin staining method. The small amount of honeydew was recorded with the test cultivars to the WBPH. In conclusion, the nature of varietal resistance of rice to the WBPH was considered to be related with the nymphal survival,develpmental period of nymphs and feeding activity.

Impact of mesoscale wind on turbulent flow and ventilation in a densely built-up area of Seoul

Seung-Bu Park,Jong-Jin Baik 한국기상학회 2013 한국기상학회 학술대회 논문집 Vol.2013 No.10

Large-eddy simulation of turbulent flow in a densely built-up area of Seoul

Seung-Bu Park,Jong-Jin Baik,Beom-Soon Han 한국기상학회 2013 한국기상학회 학술대회 논문집 Vol.2013 No.4