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當歸의 種類에 따른 四物湯이 白鼠의 胸部大動脈 血管弛緩에 미치는 影響
김형환,이주호,이제현,안덕균,박성규 대한본초학회 2001 大韓本草學會誌 Vol.16 No.2
We have examined the relaxational reponse to the water extract of Angelica gigas Nakai (AG), A. sinensis(Oliv.) Diels (AS), A. acutiloba Kitagawa (AA), and Four-Substance Decoctions (AG-FSD, AS-FSD, AA-FSD) in isolated thoracic aorta from sprague dawley(SD) rat in the presence and absence of endothelium. Rat thoracic aorta was investigated in vessel segments suspended for isometric tension recording by polygraph. Responses to AG, AS, AA and AG-FSD, AS-FSD, AA-FSD were investigated in vessels precontracted with 5-hydroxytryptamine(5-HT) were compared in vasodilation effect. We found that the thoracic aorta segments responded to AG, AS, AA and AG-FSD, AS-FSD, AA-FSD with a dose-dependent vasodilation. The 5-hydroxytryptamine induced contraction at 10-4M were inhibited by 26.3%, 2.7%, 2.1% and 24.6%, 1.1%, 3.2% after addition of the 0.1 g/㎖ water extract of AG, AS, AA and AG-FSD, AS-FSD, AA-FSD. The 5-hydroxytrptamine induced contraction at 10^-4M with and without endothelium were inhibited by 24.6% and 6.9% after addition of the 0.1 g/㎖ water extract of AG-FSD. In conclusion, AG, AS, AA and AG-FSD, AS-FSD, AA-FSD-induced relaxation in the isolated rat thoracic aorta were composed of dose-dependent relaxation. AG-FSD has very potent vasodilation.
쇼트피닝 가공에 의한 Al 7075-T6의 피로특성에 관한 연구
김태형,정성균,신용승 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
The shot peening process is most often used to improve fatigue properties of metal parts. In order to achieve optimum, repeatable and reliable fatigue enhancement from the shot peening process, the important shot peening parameters must be controlled. In this paper, the optimum shot peening condition is investigated. Rotate bending fatigue test was accomplished to investigate the effects of shot peening on the fatigue strength. Experimental results show that the fatigue strength was tremendously increased by optimum peening condition. But the fatigue strength was decreased by under peening or over peening.
Platelet-Derived Growth Factor가 백서두개관 세포군의 증식 및 교원합성에 미치는 영향
김기수,고성희,백정화,민병무,김관식,정동균 대한구강생물학회 1991 International Journal of Oral Biology Vol.15 No.2
To study the effect of platelet-derived growth factor(PDGF) on the replication and collagen synthesis of rat calvarial cells, five bone cell populations(I-V) were prepared from fetal rat calvaria by sequential enzyme digestion. After primary culture for 6-7 days, each bone cell population was collected and then population Ⅰ and Ⅱ, Ⅳ and Ⅴ were pooled together. And the cells were resuspended at 6-8×10^4 cells/㎝^2 and cultured for 2-3 days. The medium was changed to serum-free medium prior to addition of growth factor. The effect of PDGF on the cell proliferation was measured by the incorporation of [^3H]thymidine into DNA. Protein synthesis was determined by measurement of [^3H]proline incorporation into collagenase-digestible protein(CDP) and noncollagenous protein(NCP) according to the method of Peterkofsky and Die-gelmann(1971). The observed results were as follows. 1. PDGF at 10 ng/㎖ significantly increased the [^3H]thymidine incorporation into DNA in all bone cell populations. 2. PDGF at 30 ng/㎖ significantly increased the synthesis of NCP in population Ⅰ, Ⅱ and Ⅳ, Ⅴ. 3. PDGF had no effect on the synthesis of CDP but percent collagen synthesis was decreased significantly in population Ⅳ, Ⅴ. Taken together, the increase of protein synthesis by PDGF in rat calvarial cells was due to the incraese of NCP synthesis.
김현균,이성훈 서울大學校 스페인中南美硏究所 2007 이베로아메리카硏究 Vol.18 No.-
Este trabajo tiene por objeto revisar algunas conceptualizaciones pole´micas y diversos debates trascendentales que han atravesado los llamados estudios culturales latinoamericanos. Durante las últimas de´cadas ha habido una acalorada discusio´n en torno a este campo de estudio en casi todas sus instancias: desde sus caracteri´sticas y objetivos hasta sus ori´genes y perspectivas futuras. A lo largo de este proceso los estudios culturales latinoamericanos se han ido convirtiendo en un verdadero paradigma alternativo, cada vez más adecuado a la diversidad y complejidad de la nueva realidad latinoamericana. Como resultado de nuestra revisio´n se pondri´a en evidencia que este campo de estudio no representa únicamente una ruptura epistemolo´gica, en lo que se refiere a una visio´n transnacional y transdisciplinaria de los estudios de Ame´rica Latina, sino una continuidad de la propia tradicio´n cri´tica latinoamericana.
김경석,정성균,강진식,장호섭 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.3
본 논문에서는 ESPI 시스템을 이용하여 복합재료 구조물의 인위, 자연 결함을 검출하였다. 복합재료 구조물에서의 ESPI의 적용성을 알아보기 위해 복합재료 적층판 시험편, 하니컴 구조물 시험편, 접착조인트 시험편을 사용하였다. 결함을 검출하기 위해 시편의 표면변형을 쉽게 발생시킬 수 있는 열하중법을 선택하였다. 실험경과는 ESPI를 이용하여 복합재료 구조물의 결함을 쉽게 검출할 수 있고, 다른 여러 복합재료 구조물의 결함의 검출에도 적용할 수 있음을 확인하였다. In this paper, artificial and real defects(delamination and debond) in composite structures were detected by using ESPI system. There types of specimens, that is, composite laminates, honeycomb structures, and adhesive joints, were used to study the applicability of ESPI to composite structures. To detect defects in specimens, we selected thermal loading method that can easily induce the surface deformation of specimen. Experimental results show that defects in composite structures could be easily detected by ESPI. Moreover, it shows that ESPI could be usefully applied to the detection of defects of defects in various composite structures.
열처리가 Teflon^(??) FEP film의 전하보존특성에미치는 영향
김성준,이현석,김지균,권정열,이헌용 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-
In this paper, we studied the method of electrets electrode which formed to accumulate negative electric charges by corona discharges. The breakdown voltage samples and damaged samples by various corona discharges have made material stabilization and improved characteristics of electric charge storage throughout the annealing processes. After the experiment made material stabilization nearly melting point by many kinds of annealing conditions, we did the corona discharge again by the charged high voltages, a discharge electrode gap, and a discharged time. As we compared it with the best condition, we confirmed that characteristics of electric charge storages were improved.
微生物 有機質肥料의 施用이 토마토의 收量과 土壤環境에 미치는 影響
金炅濟,金碩均 東國大學校 1999 東國論叢 Vol.38 No.-
몇가지 土壤微生物劑 處理가 토마토의 收量과 土壤의 化學成分, 그리고 微生物相에 미치는 影響을 調査하였다. 모둔 微生物劑 處理區에서 無處理에 비하여 收量이 增加하는 傾向이 있었고, 특히 MPK+Compost 處理區가 가장 높았다. 土壤의 化學成分에서는 Tomi 處理區에서 K와 Mg의 含量이 높았으나, 다른 處理區에서는 差異가 없었다. 土壤의 微生物相을 調査한 結果, 總細菌數에서는 Tomi 處理區가 가장 높았고 Husk+Palma 및 MPK+Husk+Palma 處理區에서도 높게 나타났다. Bacillus는 MPK+Husk+Palma 處理區가 가장 높았고 Husk=Palma와 Tomi 處理區에서도 몹시 增加되었다. Actionmycetes와 fungi에서도 tomi 處理區가 매우 增加하였으나, 다른 處理區 間에는 差異가 없었고, pseudomonas에서도 却 處理間에 差異가 없었다. This study was carried out to investigate the effect of microbial fertilizers on yields of tomato. Six microbial fertilizers, MPK+Husk+Palma, Husk+Palma, MPK+Compost, Compost, Bio livestock cattle system (BLCS) cattle dropping, and Tomi, were used. All of the microbial fertilizers were tend to increase yields of tomato, especially MPK+Compost treatment was most effective. In a chemical components of soil, concentrations of K, Mg were increased with Tomi treatment, however, the other concentrations of soil chemical components were not different. In a microbial floras of soil, Tomi, Husk+Palma, and MPK+Husk+Palma treated plots increased in numbers of total bacteria and bacillus. Tomi treated plot increased in numbers of actinornycetes and fungi, also. The other microbial floras of soil were not different, however. The microbial fertilizers may affect the useful microbial floras, therefore, it would be increase yeld of tomato treated with them.