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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.
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.
문추연,안종수,김수생 동아대학교 환경문제연구소 1993 硏究報告 Vol.16 No.1
The Purpose of this research is aimed to find out optimum operating conditions for Phosphorus removal by AB-Process. The Comparision between a partially aerated at B-step and fully aerated AB-Proecess was made at different mixing and aeration time, detention time. The BOD removal efficiency showed up to 90% in the partially aerated at B-step as well as fully aerated process. In the partially aerated process at B-step the substrate removal efficiency remained constant irrespective of anaerobic/aerobic reactor retention time ratios. Phosphorus removal efficiency in the partially aerated process at B-step was higher than that in the fully aerated AB-Process. Phosphorus removal efficiency in the process tended to increase as the anaerobic reactor volume in the B-step increased.
電子빔勵起 KrF레이저의 出力特性에 대한 시뮤레이숀 解析
李柱熙,崔富淵 慶熙大學校 1985 論文集 Vol.14 No.-
By developing a comprehensive computer simulation code for e-beam excited KrF lasers, we studied mainly the effect of output performance dependence on excitation rate excited by an intense electron beam. Especially for short pulse (<50 ns) and high excitation rate pumping (>2Mw/㎤), and under realizable conditions, it is found to calculated with an intrinsic laser effieiency as a function of excitation rate. The results were compared with some experimental results, and a fairly good agreement was obtained. At an excitation rate of 7 Mw/㎤, and at a total gas pressure of 2 atm, an intrinsic efficiency of up to 10.5% is found to be attainable. We have also calculated the KrF^* production efficiency and the laser extraction efficiency, and explained the output performance in terms of excitation rate.
所得再分配에 관한 硏究 : 公共勤勞福祉 增大方案을 중심으로 WITH EMPHASIS ON THE WELFARE POLICY FOR WORKING FAMILIES
정주성 단국대학교 대학원 1992 學術論叢 Vol.16 No.-
The purpose of this paper is to consider a properiety of the welfare policy for the working families as a positive redistribution policy in Korea. A redistribution function in capitalistic economy is the major part of government function because of the capitalistic economy has not an ability to correct the inequality automatically. Recently an income redistribution policy is emphasized by the working families in Korea. The reason is that the wages of the working families was raised in the last several years but they feel that they are low their real income and econnomic status rather than before on account of a speculation in real estate. So they demand intensively not only a raise in wages but an increase of welfare benefits for the real income rise. From this viewpoint, we can estimate that an expanison policy of working families welfare like 'the working families housing policy' is effective. Now an improvement of income distribution is not a bottleneck of growth but a precondition for growth in korea economy. It is important that we realize that the stabilization of prices and the eradication of speculation in real estate is the efficient redistribution policy.