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김기대 대구대학교 산업기술연구소 1986 産業技術硏究 Vol.5 No.-
The virtual work method for the analysis of horizontally curved girders is adopted in the present research. The girders were used continuous spans having constant circular-are curvature in a span, H-shaped constant cross sections, constant moments of inertia, and concentrated loadings. The virtual work method was in which the effect of warping restraint is not considered. Numerical examples were compared with the values of the differential equation method. It is found that shear force and bending moment were slightly effected, but deflections were more greatly.
Microcomputer 를 利用한 農業機械要素의 Strain測定에 關한 硏究
金基大,金太均,金聲來 충남대학교 농업과학연구소 1981 農業技術硏究報告 Vol.8 No.1
To design more efficient agricultural machinery, the accurately measuring system among mane other factors is essential. A light-beam oscillographic recorder is generally used in measuring dynamic strain but it is not compatible with the extremely high speed measuring system such as 1,000 m/s, also is susceptable to damage due to vibration while using the system in field. The recorder used light sensitive paper for strip chart recording. The reading and analysis of data from the strip charts is very cumbersome, errorneous and time consuming. A microcomputer was interfaced with A/D converter, microcomputer program was developed for measuring, system calibration was done and the strain generated from a cantilever beam vibrator was measured. The results are summarized as follows. 1. Microcomputer program was developed to perform strain measuring of agricultural machine elements and could be controled freely the measuring intervals, no. of channels and no. of data. The maximum measuring speed was 62 μs. 2. Calibration the system was performed with triangle wave generated from a function generator and checked by an oscilloscope. The sampled data were processed using HP 3000 minicomputer of Chungnam National University computer center the graphical results were triangle same as input wave and so the system have been out of phase distorsion and amplitude distorsion. 3. The strain generated from a cantilever beam vibrator which has free vibration period of 0.019 second were measured by the system controlled to have 1.0 ms of time interval and its computer output showing vibration curve which is well filted to theoretical value. 4. Using microcomputer on measuring the strain of agricultural machine elements could not only save analyzing time and recording papers but also get excellent adaptation to field experiment, especially in measurement requiring high speed and good precision.
合成PC빔橋의 프리스트레스량 및 빔간격의 最適化에 관한 硏究
김기대,구자훈 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.4
This paper is to propose optimum algorithm by the SLP method, which is able to get a optimum solution easily by the use of the linear programming method in order to design a practical composite PCI girder bridges. To verify the reliability of results, this method was applied to the composite PCI girder bridge which is being used now. As a result, the algorithm of this paper was revealed easy and practical to get the PCI girder space, the slab section, and the optimum prestress.
김기대,권원태,주종남 대한기계학회 1994 대한기계학회논문집 Vol.18 No.7
In this paper, in-process chatter detection methodology which utilizes nondimensional characteristic variables is introduced. To obtain nondimensional chatter detection indexes which are constant regardless of the cutting conditions during machining with the same tool and workpiece material, both the cutting forces and accelerations are measured and processed in time and frequency domain. The indexes are calculated from the present and past value of the acceleration and cutting force signals in time and frequency domain. The chatter is identified when these chatter detection indexes are bigger than the threshold which is decided by preliminary experiments. The experiment shows that these indexes works very well in-process chatter detection.
교육기관에서의 효율적인 행정정보시스템(ERP) 구축방안에 관한 연구 : 중소규모 대학을 중심으로
김기대,황경태 동국대학교 경영연구원 2006 경영과 사례연구 Vol.29 No.2
본 연구의 목적은 중소 규모 대학에 적합한 ERP 시스템의 구축 방법을 제시하는 것이다. 이를 위해서 먼저, ERP 시스템 구축에 관한 선행 연구 및 ERP 시스템을 구축한 국내외 대학들의 현황 분석을 통해서 ERP 구축 단계별로 핵심성공요인들을 도출하였다. 다음으로는 도출한 성공요인을 기반으로 ERP 시스템을 구축한 5개의 대학(대형 대학 2개, 중소 규모 대학 3개)을 중심으로 면담, 설문, 보고서 분석 등과 같은 다양한 방법으로 데이터를 수집하여, 대학 규모별로 구축 과정의 차이점을 분석하였다. 마지막으로는 이러한 분석 결과를 바탕으로 중소규모 대학에 적합한 구축 단계별 ERP 시스템 구축 방안을 제시하였다. 본 연구의 결과는 향후 ERP 시스템 도입을 고려하고 있는 기관에 효율적인 의사결정 정보를 함으로써, 효율적인 대학의 정보화 전략 수립 및 ERP 시스템의 구축에 활용될 수 있을 것으로 판단된다.