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김건희 전주대학교 공학기술종합연구소 1998 전주대학교 공학기술종합연구소 학술논문집 Vol.4 No.2
In grinding operations, one of the most important problems is to increase efficiency of process. In order to achive this purpose, it is necessary to administer the tool life of grinding wheel and to optimize grinding conditions. Frequently dressing result in lowering the process efficiency remarkably and makes production cost high. On the other hand, grinding with a worn wheel causes the workpiece surface roughness to increase and then results in the occurrence of such troubles as chatter vibration and burning.
전오성 전주대학교 공학연구소 1996 전주대학교 공학기술종합연구소 학술논문집 Vol.2 No.2
The motion of a rigid body (upper rotor) pin-jointed at a point on a base body (base rotor) is analyzed. The base rotor is strongly accelerated both angularly and along the axis perpendicular to the rotation plane. Since the motion of the assembly occurs during very short time, it is very hard to assess the motion experimentally. To analyze the motion, the equations of motion are made and calculated numerically. The friction between the upper and the base rotor surfaces is considered, and the effect is discussed.
Applying SSM for TPM Application
황선문,강병석 전주대학교 공학연구소 1996 전주대학교 공학기술종합연구소 학술논문집 Vol.2 No.2
This paper explores the effects of using Soft System Methodology(SSM) for the applications of Total Productive Maintenence(TPM). SSM is analytical tool for the changes, and TPM is the method of improving the effectiveness of machinery maintenance. These two different management tools are harmonized for improving machinery utilization in the confectionery industry in Korea Since, the confectionery industry depends their production efficiency on highly automated machines, improving utilization rates of these machines are the very important issue for the industry. Thus, TPM has been implemented to analyze the advantages and disadvantages from the machinery maintenance. In the project, SSM was also used to the effective application of TPM in order to approach the real world problems. For the application aspects of TPM, Action Research was choosen to find the implemention aspects of TPM. According to the results of this study, breakdown rates of the machines were reduced and the machinery maintenance became easier than before. Furthermore, the plant operators have participated their work more positively.
정동조 전주대학교 공학연구소 1996 전주대학교 공학기술종합연구소 학술논문집 Vol.2 No.2
Analysis of outrigger and belt truss structures with a linearly varying core and exterior columns, subjected to a triangular load distribution has been made. This is useful for considering graduated wind loading and static equivalent earthquake loading. Optimum levels of the outrigger and belt trusses for minimum top drift are obtained by maximizing the drift reduction caused by the outriggers and are plotted as a function of a nondimensional relative stiffness parameter ω, for structures with two outriggers and with variable stiffnesses of the core and outrigger system. The optimum levels for structures subjected to a triangularly distributed load, with its apex at the base, are 0.02H - 0.03H higher than for structures subjected to a uniformly distributed load.
시간에 종속되는 스트렝스-스트레스 모형에서의 신뢰구간 추정법 연구
최경호,이현우 전주대학교 공학기술종합연구소 1999 전주대학교 공학기술종합연구소 학술논문집 Vol.5 No.-
We treat problems of estimating reliability R(t) = P[ Y(t) > X(t) ] in the time dependent stregnth-stress model in which a unit of stress X(t) is subjected to environmental strength Y(t) at time t. In this paper we introduce a special model of R(t) with flxed strength and unaccumulated stress case, and several nonparametric confidence interval of R(t) are analyzied and compared by simulation.
김홍건,나석찬,조영태 전주대학교 공학기술종합연구소 1999 전주대학교 공학기술종합연구소 학술논문집 Vol.5 No.-
A strategy of the optimal shape design with FEM (Finite Element Method) is proposed using the subproblem approximation method. Procedures are based on the calculation of the subproblem approximation algorithm. A cantilever beam with two different loading conditions, a concentrated load and an uniformly distributed load, is implemented to optimize the shape. This gives a good design strategy on the optimal cantilever shape. It is found that the convergence is quickly finished with the iteration number below ten. An optimal shape of cantilever beam is shown with stress contour plot. Theoretical result of the cantilever beam having the same stress along the whole length is also length is also presented as on apparent shape and evaluated in detail.
Program Slicing Based on Predicate Specification
Lee, Wankwon 전주대학교 공학기술종합연구소 1999 전주대학교 공학기술종합연구소 학술논문집 Vol.5 No.-
Slicing technique can help to solve many software engineering problems such as testing, program understanding and extraction of a reusable component. However, current slicing criteria and the corresponding techniques are not precise enough in that the obtained slices contain unnecessary statements in some situations. In this paper, we propose a new slicing technique that takes the specification of the slice into account. The information presented in the specification helps to produce more precise slices by removing statements that are not relevant to the specification for the slice. Our technique is based on the weakest precondition and strongest postcondition. We show an example application of the proposed technique in extracting a reusable component.
Kwon, Sootae 전주대학교 공학기술종합연구소 1998 전주대학교 공학기술종합연구소 학술논문집 Vol.4 No.2
This paper considers a buffer allocation problem of flexible manufacturing system composed of several parallel workstations each with both limited input and output buffers where AGVs are used for input and output material handling. Some interesting properties are derived that are useful for characterizing optimal allocation of buffer spaces for the given performance evaluation model. By using the properties, a solution algorithm is exploited to solve the optimal buffer allocation problem. A variety of differently-sized decision parameters are numerically tested to show the efficiency of the algorithm.
강대호 전주대학교 공학연구소 1997 전주대학교 공학기술종합연구소 학술논문집 Vol.3 No.3
According to the building regulation in Korea, war-time shelters shall be provided in the underground spaces in all apartment houses. However, at present in peace-time, the underground spaces have trends to be used as storage room or for other uneffective purposes with low-quality indoor invironment. Over 30 cases of present use of the underground spaces have been surveyed and analyzed. In most of the cases, the underground spaces are used for stocks of storage illegallly, only few used for small community spaces actively. In the study, Some problems of the present uses are duscussed and some alternatives such as sunken garden for the cummunity common spaces are suggested for both war-time shelter and peace-time shelter, with the view of acitve and effective spaces utilization.
이완권 전주대학교 공학연구소 1996 전주대학교 공학기술종합연구소 학술논문집 Vol.2 No.2
Structure charts are derived from the data flow diagrams, which are the results of structured analysis and with this procedure many design decisions are needed. One is to choose transform center. In this paper, we devise a fuzzy metrics to figure out the transformational extent of data flows. Highly degreed transformations are hired to boss and first-cut structure chart is constructed straightforwardly based on that module.