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金永錫 全北大學校 1981 論文集 Vol.23 No.-
An uniaxial compression, a Brazilian test and a direct shear test were performed to determine the shear strengths of the specimen of Gom-chi Hill sandstone and Cheon-ho Mt. limestone and to compare them with each other. The stress-axial, stress-lateral strain and stress-volumetric strain diagrams are displayed on a graph to determine the failure property of limestone. The result shows that all of the shear strengths determined by the different testing methods are not in accordance with each other, but the shear strength determined by the equation (1) is almost equal to that on the common tangent line of Mohr's circle. The failure properties of Cheon-ho limestone represent that in the beginning, porosity is compacted because of low uniaxial compressive strength, microcracks occur at the next stage, and the stress-lateral strain greater than the stress-axial strain occurs at the failure stage.
김영석(金榮石),박성진(朴成鎭) 한국조명·전기설비학회 1991 한국조명·전기설비학회 학술대회논문집 Vol.1991 No.-
The lead angle control step motor for high speed drive is represented in this paper. It was designed position and speed Information feedback system which was composed of step motor coupled with encoder, z-80, and hardware. The relationships between the lead angle and speed characteristics are established by experiments.
김영석(金榮石),유완식(劉完植) 한국조명·전기설비학회 1991 한국조명·전기설비학회 학술대회논문집 Vol.1991 No.-
This paper presents the speed control of DC motor based on deadbeat response method. Since the deadbeat response systems are characterized by the discrete time control, the instability of the systems caused by saturation and time lag problems is inevitable. In order to release these problems, we propose a compensator utilizing the predictive control so that the fast response can be also achieved in the saturation state. Experimental results demonstrated that outputs are able to settle final values in one sampling time for unsaturated reference inputs. For saturated reference inputs, outputs take one sampling time after getting free from the saturation state. Further we are able to settle the fast response with suppressed overshoot by appling the predictive control.
朴洪民,金永錫,金昇坤,金溢中 全北大學校 1982 論文集 Vol.24 No.-
This study was performed for the purpose of the physical and mechanical properties of Rhyolite, Andesite, Granite-gneiss, Quartz-porphyry, in Deogon mine. The main results obtained were as follows ; (1) The angle of internal friction and the brittleness of samples were proportioned to the ratio of compressive strength to Brazillian tensile strength. (2) The shear strength by the equation (3-3-2) was nearly equal to that on the common tangent line of Mohr's circle. (3) The stress-volumetric strain curves of all samples were divided into three stages ; the preexisting cracks were clossed at the first stage(Ⅰ), the linear elastic deformation occurred because of frictional sliding on crack face at the second stage (Ⅱ), the micro-crack was started in the sample at the third stage (Ⅲ). and the lateral strain was greater that the axial strain at the failure stage of the sample. (4) The lowering ratio of Brazilian tensile strength for dry state and saturation state of samples were high in the following order ; Quartz-porphyry, Andesite, Rhyolite, Granite-gneiss. (5) The normal stress acting on failure plane was proportioned to the compressive strength. (6) The store energy was proportioned to the strain energy.