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하상경사가 변화는 실험실 데이터를 이용한 Chiu의 유속공식과 Manning 의 유속공식과의 비교분석
추태호(Choo, Tai-Ho),옥치율(Ok, Chi-Youl),이승관(Lee, Seoung-Kwan),제성진(Je, Sung-Jin) 한국산학기술학회 2007 한국산학기술학회 학술대회 Vol.- No.-
현재까지 수리학 분야에서 가장 많이 회자되고 인용된 공식이 있다면 아마도 1890년에 발표한 Manning의 유속 공식이라고 해도 과언은 아닐 것이다. 그만큼 그 쓰임새가 많았을 뿐만 아니라 사용의 편리성과 정확도에서도 매우 우수하였기 때문일 것이다. 그러나, 아무리 우수한 공식이라도 약점이 있듯이, Manning의 유속공식 역시 조도계수n을 추정하는데 많은 어려움이 있는 것도 주지의 사실이다. 이러한 어려움을 극복하기 위하여, 본 연구에서는 확률통계에서 사용되는 엔트로피 개념을 이용한 3차원 유속분포식인 Chiu의 유속공식을 사용하였다. 그러나 지금까지 실증적으로 Chiu의 유속공식과 Manning의 유속공식을 비교분석하였던 논문은 Chiu와 Choo의 논문에서 일부 언급된 것 외 논문에서는 찾아볼 수 없는 것이 현실이다. 따라서 본 연구에서는 하상경사를 임의로 변경 가능한 실험수로를 선택하여 정밀법에 의한 유속측정을 우선 실시하였다. 같은 지점의 같은 단면에서 하상경사(Ө)가 0.000935부터 0.025794까지 28번의 경사변화를 주고 각 경사마다 유량을 측정하여 28개의 유량측정 데이터를, Chiu의 유속공식과 Manning의 유속공식에 각각 적용하여, Chiu의 M과 Manning의 n사이의 관계뿐만 아니라, 하상경사변화에 따른 관련인자들을 함께 분석하였으며, 실측된 평균유속과도 함께 분석하였다.
영구치 치수 기질세포를 이용한 연골 분화 및 분화 시기에 따른 형태학적 변화
정주령,김하나,박열,김민정,오영주,신수정,최윤정,김경호 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.1
Objectives: The aim was to confirm the stem cell-like properties of the dental pulp stromal cells and to evaluate the morphologic changes during in vitro chondrogenesis. Materials and Methods: Stromal cells were outgrown from the dental pulp tissue of the premolars. Surface markers were investigated and cell proliferation rate was compared to other mesenchymal stem cells. Multipotency of the pulp cells was confirmed by inducing osteogenesis, adipogenesis and chondrogenesis. The morphologic changes in the chondrogenic pellet during the 21 day of induction were evaluated under light microscope and transmission electron microscope. TUNEL assay was used to evaluate apoptosis within the chondrogenic pellets. Results: Pulp cells were CD90, 105 positive and CD31, 34 negative. They showed similar proliferation rate to other stem cells. Pulp cells differentiated to osteogenic, adipogenic and chondrogenic tissues. During chondrogenesis, 3-dimensional pellet was created with multi-layers, hypertrophic chondrocyte-like cells and cartilage-like extracellular matrix. However, cell morphology became irregular and apoptotic cells were increased after 7 day of chondrogenic induction. Conclusions: Pulp cells indicated mesenchymal stem cell-like characteristics. During the in vitro chondrogenesis, cellular activity was superior during the earlier phase (within 7 day) of differentiation.
金周賢 淸州大學校 1960 論文集 Vol.3 No.1
It is a well-known fact that an act of repetition plays a very important part as a means of intensification; this fact is so well instinctively recognized that it is taken for granted as a matter of course without particular attention. However, this is not a problem worthy of little attention but a problem which provides us with many subjects for study. From the above view-point, the writer of this thesis especially points out the importance of REPETITION as a means of intensification and at the same time, makes a survey of some basic problems which arise out of it. Firts of all, the writer, in making a survey of the basic problems, inquires into both various forms of repetition and the freuqency of use of those forms, and further tries to inquire into both the metrical effect brought on by the act of repetition and the relation between repeated expressions and intensives with which the former is readily replaced. In the above inquiry, the writer has chosen seven literary works such as Shakespeare's Hamlet, Pope's Essay on Man, Burke's Speech on Conciliation with America, Coleridge's The Ancient Mariner, Emerson's Representative men, Tennyson's Enoch Arden, Huxly's Two or Three graces, and has made a statistical survey of the problems, and the examples given here are selected from the works of celebrated writers. The table of contents of this thesis is as follows: 1. Preface 2. The repetition of interjections and the mental effect of repetition. 3. The application of repetition to intensifying expressions A. Various forms of repetition and examples (ⅰ) General patterns (a) The continuous repetition (α) The asyndetic repetition of the same words (β) The syndetic repetition of the same words (γ) The syndetic repetition of the synonymous words (b) The discontinuous repetition (ⅱ) Special patterns (a) A form of "Holy of holies" (b) A form of "Blacker than black" B. An inquiry into the frequency of repetition C. The metrical effect of repetition 4. Repetition and intensives
감꼭지나방(Kakivoria flavofasciata Nagano)의 生態에 關한 硏究 (第1報)
尹桂敬 全南大學校 農漁村開發硏究所 1963 農業科學技術硏究 Vol.1 No.-
Ecoiogical studies on Kakivoria flavofasciata Nagano 1. Present studies made from 1962 to 1963 was designed in order to investigate the morphological and ecological features of the Kakivoria flavofasciata Nagano which occurs in the area of Biaemyun and paekwoondong Kawnju. 2. Ecological studies were made exclusively on the insects which feeds on persimons Boou. 3. The insect asses the winster in feature larva in the thickish calyx and takes two generations per year. 4. The length of male adult is about 5.5-6.0 mm and female adult about 6.5-7.1mm. A yellawish browish brown hand is on the fore wing toward outer margin between anterior angle and costal margin, and long hair is on the hind margin, fore and hind wing. Antenna is yellewish brown and about 3mm seteceous. 5. The color of larva is dark brownish violet, the head red brown, and the length 0.9-13mm. Many wrinkles and small blak promontories are on the body white hair on every segment, Being old it became pupa in Cocoon. 6. The results of investigation showes the larve infected to persimmon were concentrated in the upper part of fruitstem. 7. The term of the most serious damage of the first generation was about July 5 and of the second generation about September 5. 8. The larva period is 32.9-38.3 days and the pupa stage requries 9.4-9.9 days. 9. It was observed that maximum occurrence of the adult grown at laboratory was earlier 3 days than the occurrence of the adult of the first generation in the field which was most abundant about May 26 and the occurrence of the generation in the field was observed most about August 5 while the maximum occurrence of second generation at the loboratory was about 2days earlien than that of in the field.
비전기식뇌관의 트렁크라인 시차가 발파진동에 미치는 영향
강추원,고진석,김재웅 朝鮮大學校 建設技術硏究所 2000 建設技術硏究 Vol.20 No.1
In this study, blasting condition uniformed, and vibration value changed by the trunk line and measuring distance was measured. Four patterns of delay time of surface detonator and trunk line which are used at open fit blasting UB-25 and surface detonator of UB-17, trunk line UB-17 and surface detonator of UB-42, and trunk line of UB-25 and surface detonator of UB-42 are used in pattern 1, 2, 3, and 4 respectively, In result, the overlap time in pattern 1, 3 are 10 times respectively. Because of that reason, the value of vibration velocity in pattern 3 is smaller than in pattern 1. As the time difference of Trunk line, a method of decreasing the surface vibration is to design the number of overlap minimized a t interval time.