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정교철 안동대학교 기초과학연구소 1997 基礎科學 硏究論文集 Vol.8 No.1
Most rock masses contain a joint system that consist of a number of joint sets. A joint may be defined formally as a fracture that traverses a rock mass and is not accompanied by any discernible displacement of one face of the fracture relative to the other. In addition to, individual joints have variable but finite length. This study describes how the three-dimensional estimation of joint distribution is calculated from surface observations in field for engineering purposes. Three-dimensional joint count is a useful measure of the degree of jointing given as number of joints in a unit volume of rock masses and is easily calculated from standard joint descriptions. The three-dimensional estimation on joint distribution in outcrop can also be used to calculate the interblock size in jointed rock masses.
정교철,김진성 안동대학교 환경연구소 2001 환경연구 Vol.1 No.-
The area under investigation for the past ten years is in the vicinity of the Imha dam. The area is excavated for construction of new road in 1989. Differential heave in one part of the area is occurred and differential subsidence and cracking in another part are took place because of the road construction. The rocks involved are sandstone, shale and mudstone. Geotechnical and surveying techniques have been used to analyze slope instability in the past but without solving the problem of the mechanism of the these failure processes. Geophysical methods (electric resistively method and seismic prospecting method) were applied in order to identify underground geology and geological structures. The interpretation of these slope failure studies is not a straightforward analysis, but the general conclusion is that the complexity of a slope failure requires a complex investigative approach by using a combination of different geophysical methods and geotechnical methods.
정교철 안동대학교 기초과학연구소 1996 基礎科學 硏究論文集 Vol.7 No.1
This study was carried out to analyse behavior of blocks in discontinuous rock slopes. The kinematic characteristics, which the discontinuous rocks show on slope, was analysed by various engineering geological factor, and from which a preliminery formula was derived. These blocks tend to failure on the active plane owing to there high angle of dip, at this point it results in toppling failure for the block which has its weight center in the upper part(-vector), and sliding for the block which has its weight center in the lower part(+vector). If, however, those blocks have great undulation angle(i) against active plane, sliding doesn`t happen because of friction force. Therefore, if the undulation angle is known the possibility of failure can be determined. Kinematic conditions of failure are influenced by undulation angle within dilation interval, but they demonstrated as following formula that kinematic conditions of failure are not neary influenced by undulation angle within roughness shear interval. K_(t)=(M_(1)+M_(2)-M_(3))/(M_(1)+M_(2)+M_(3)) M_(1)=cosφ{cosi+sinitan(φ+i)} M_(2)=sinφ{cositan(φ+i)-sini} M_(3)=cositan(φ+i)-sini. And the values of K,in this study area are nearly plotted on limit line of failure.
Brainstorming 기법을 이용한 Business Function Modeling Tool의 개발
김철한,정영교 대전대학교 산업기술연구소 1998 산업기술연구소 論文集 Vol.9 No.2
When function modeling with IDEF0 which is called as a standard methodology for CALS (FIPS 183), the initial work is to determine the purpose and viewpoint, and the next work is to generate a data list and an activity list. These works require participant's discussion and agreements. The main problems for these working are a communication between participants and efficient discussion processing. Brainstorming is the most useful method for these work. The paper is for development for the modeling assistant tool to promote the business modeling. In this paper, we will introduce the tool which name is 'MindMapper'. This tool is an implementation of mind-map method. Using this tool, we refine the result of the brainstorming about activity list and translate the result into the functional model of IDEF0. The translated functional model is prototype model without ICOM arrows.
정교철 ( Gyo-cheol Jeong ) 대한지질공학회 2018 지질공학 Vol.28 No.4
불포화대 매질은 지하수면 상부층으로서 지하수에 의해 포화되어 있지 않거나 불연속적으로 포화되어 있는 층으로 정의된다. 불포화대의 특성은 토양층 하부로부터 지하수면까지 유동하는 오염물질의 저감에 영향을 미친다. 최근 지하수오염도 평가에서는 불포화대 매질의 이방성 및 불균질성을 고려하지 않고 투수성을 나타내는 가중치를 주는 문제점이 있다. 지질학적 매질들은 다양한 범위의 투수성을 갖는다. 표준화된 입도를 대상으로 투수성을 나타내는 가중치로 오염취약도 작성에 적용한다면 불포화대 지질특성을 고려하여 작성한 오염취약도보다 과대하게 작성될 것이다. 본 연구에서는 이방성의 불균질 불포화대의 투수특성을 알아보기 위하여 복수의 불포화층을 고려한 실내 칼럼실험을 실시하였으며, 이를 바탕으로 현장 시추자료에서 얻어진 불포화대 매질의 특성에 의한 평균 투수계수로 환산하여 기존의 불포화대의 가중치를 적용한 지하수오염취약도와 불포화대 매질특성을 고려한 지하수오염취약도를 비교한 결과 불포화대 매질특성을 고려한 지하수오염취약도가 현장의 수질 측정결과와 잘 일치한다. The media in the undersaturated zone is defined as the uppermost layer of the water table at which the groundwater is unsaturated or saturated discontinuously. The properties of the unsaturated zone can affect the reduction of contaminants that flow from the lower part of soil to the water table. In recent, there have been problems in evaluating groundwater contaminations vulnerability because weighted value for permeability is given, regardless of anisotropy and heterogeneity in the unsaturated media. Geological media have various ranges of permeability. When applying the weighted value, representative of permeability for grain sizes standardized, to construction of contamination vulnerability, it will produce more exaggerated result than the case that considers unsaturated geological properties. In this study, we performed laboratory column tests considering two sets of the unsaturated layers in order to investigate the permeability in anisotropic unsaturated zone with anisotropy. On the basis of the tests, average permeability coefficients were calculated considering the properties of unsaturated media obtained from drill cores in the field. The final contamination vulnerability map constructed shows that the contamination vulnerability map applying the properties of geological media of the unsaturated zone coincides much better with the results measured in the field, compared to the case of contamination vulnerability considering the weighted value in the unsaturated zone.