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Analysis of the Fatigue Stress on Welded Joints of the U-Rib in an Orthotropic Steel Deck
Hong, Sung Nam,Park, Jon Gin,Park, Sun Kyu,Choi, Jin Woong Trans Tech Publications, Ltd. 2014 Advanced materials research Vol.891 No.-
<P>With the improvement in the quality of steel materials, the issue of fatigue cracking has become more important for steel bridges than the failure of the material itself. In this study, the Pelikan-Esslinger method was used to determine the fatigue stress of an orthotropic steel deck. A parametric study was then conducted with the steel deck components as the parameters. Based on the results, the effect of the diverse components of the steel deck on the fatigue stress was analyzed.</P>
洪壯厚,朴容聖,李鎭國 서울産業大學校 1978 논문집 Vol.11 No.1
Croton Nitrile로부터 CH₃CHBrCHBrCOOCH₃을 合成하는데 있어서 새로운 경로를 택하여 2,3-Dibromobutylamide을 合成하여 이것을 다시 메틸에스테르로 만들었다. 본 연구는 새로운 合成물질인 2,3-Dibromobutylamide의 분자측량측정과 C.H.N.Br의 分析과 IR의 확인과정을 거쳤다. 2,3-Dibromobutylamide has been synthesized from crotonnitrile. The molecular weight of 2,3-dibromobutylamide obtained cryoscopically by measuring in benzene by means of osmometer. The cryoscopic data along with the results of chemical analysis and infrared spectra of newely synthesized material indicated that 2,3-dibromobutylamide.
金洪云 한국농업정책학회, 한국축산경영학회 2000 농업경영정책연구 Vol.27 No.2
Rice production in China has been rapidly increased since 1949. However, the problem of increasing production will also be left the major subject of the rice industry in China for a long time. Recently, the consumer's preference of rice is changing, they prefer japonica rice to indica rice. For that reason, the production system has been inevitably changed in all the areas of China, especially, the North of Yangze River.
감태(Ecklonia cava) 줄기 및 잎의 효소적 추출물과 메탄올 추출물에 의한 항산화 활성비교
이승홍(Seung-Hong Lee),김길남(Kil-Nam Kim),차선희(Seon-Heui Cha),안긴내(Gin-Nae Ahn),전유진(You-Jin Jeon) 한국식품영양과학회 2006 한국식품영양과학회지 Vol.35 No.9
본 연구에서는 제주 연안에 서식하는 갈조류 중 감태의 줄기와 잎의 항산화활성을 비교하기 위하여 감태 줄기와 잎으로부터 효소적 가수분해와 메탄올을 이용하여 각각의 추출물을 제조한 후 이들로부터 활성산소종의 소거활성 및 세포의 산화적 손상 억제활성을 포함하는 항산화활성에 대한 차이를 비교 검토하였다. 여기에서 효소적 가수분해를 이용하여 제조된 감태의 효소적 추출물은 메탄올 추출물에 비하여 폴리페놀 함량은 낮았으나, 수율은 약 30% 이상 높게 나타났다. 감태는 줄기와 잎의 모든 부분에서 항산화활성이 우수하게 나타났으며, 두 부위 간의 유의적인 차이는 없었으나, 대체로 잎의 추출물이 줄기의 추출물보다 약간 우수한 항산화효과를 나타내었다. 이러한 결과는 감태의 잎 뿐만 아니라 줄기 또한 마찬가지로 우수한 생리활성 재료임을 확인할 수 있었다. 그리고 메탄올 추출물에 비해 효소적 추출물은 hydroxyl radical 소거활성을 제외한 전반적인 항산화 효과 분석에 있어서 더 유용한 경향을 보였다. 이와 같은 결과는 여러 가지 효소들이 복합되어진 효소가 세포벽에 있는 섬유질이나 당단백질 혹은 알긴산 고분자물질 등을 분해 시키는 작용을 하여 활성물질들이 원활히 추출될 수 있도록 유도해 주는 작용을 하였기 때문이라고 사료된다. 그리고 높은 수율을 바탕으로 한 수용성의 추출물이기 때문에 그들이 가지고 있는 생리활성물질을 식품산업에 쉽게 응용시킬 수 있으며, 유기용매와 같은 화학약품을 사용하였을 때에 발생할 수도 있는 안전성에 대한 문제도 해결할 수 있을 것이다. 이상의 결과로 감태는 잎 뿐만 아니라 줄기도 잠재적 의약품 소재 및 기능성식품 소재로서의 가능성이 충분하다고 판단된다. In this study, antioxidant activities of enzymatic and methanolic extracts from E. cava stem and leave were evaluated by measuring the scavenging activities on 1,1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl radical, hydrogen peroxide and the inhibitory effects on DNA damage induced by oxidative stress of cells. Enzymatic extracts were prepared by enzymatic hydrolysis of both stem and leave using food grade five different carbohydrases (Viscozyme, Celluclast, AMG, Termamyl, Ultraflo) and five proteases (Protamex, Kojizyme, Neutrase, Flavourzyme, Alcalase). The enzymatic extracts were lower than methanolic extracts in polyphenol contents, but higher in extraction yield by approximately 30%. The enzymatic extracts were superior to methanolic extracts in DPPH and H₂O₂ scavenging activities and DNA damage protective effect. There were no significant antioxidant activity difference between stem and leave, but the extracts of leave were relatively better than those of stem. In this study it is suggested that E. cava stem as well as its leave would be a good raw materials for antioxidants compound extraction and enzymatic hydrolysis would be a good strategy to prepare antioxidant extracts from seaweeds.
P.V.C관(管)을 이용(利用)한 저습답(低濕畓)의 이모작(二毛作)에 관(關)한 연구(硏究)
주재홍 ( Jen Hong Joo ),황용진 ( Young Gin Whang ),이유근 ( Yoo Keon Lee ) 한국농공학회 1973 韓國農工學會誌 : 전원과 자원 Vol.15 No.2
The study on the drainage has been performed for long time in Korea. The 4th attempt of study on under-drainage by use P.V.C. suction pipe were made in 1971. Drainage method, soil temperature, growth of crop and yield were observed and compared with the 3 drained Plots and at the 3 undrained ones. Obtained results were as follows; 1. The soil temperatures in the drained plots were 1.8℃ higher than that in the undrained ones during the irrigation period. 2. 20% of increased yield were resulted from practicing of P.V.C. suction pipe drainage. 3. The annual net income per 1ha of paddy rice field with P.V.C. suction pipe drainge was 82,900 won.
수중재활운동이 편마비 아동의 대근육 운동기능에 미치는 효과
김미진(Mi Gin Kim),홍예주(Ye Ju Hong),구광수(Kwang Soo Koo) 한국발육발달학회 2009 한국발육발달학회지 Vol.17 No.2
The purpose of this study was to examine the effects on the gross motor skills of the children with hemiplegia by aquatic rehabilitation exercise. 12 children with hemiplegia were selected as subjects of this study. They were divided into two groups; one group was exercise group(n=6), and the other group was control group (n=6). The results of this study were as follows; 1. Aquatic rehabilitation exercise showed effect on sitting trunk flection of children with hemiplegia. 2. Aquatic rehabilitation exercise showed effect on standing long jump, shuttle run change of body position, sit-up of children with hemiplegia. 3. Aquatic rehabilitation exercise showed effect on opened-eyes foot balance, closed- eyes foot balance of children with hemiplegia. 4. Aquatic rehabilitation exercise showed effect on movement skill test battery`s total score of children with hemiplegia. In conclusion, aquatic rehabilitation exercise has a positive effect on the body flexibility, muscle strength, agility and balance which is contribute to improve of physical fitness and health. Therefore, further studies were suggested that various and specific measures for the practical application of this program were to be applied.