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          • 立體뼈대의 解析을 爲한 program 事例硏究

            柳又秀 동아대학교 공과대학 부설 한국자원개발연구소 1975 硏究報告 Vol.1 No.1

            A computer program is described for the first order elastic analysis of space frames. The structural analysis is based on stiffness method by WILLIAM WEAVER. The type of frame which cam be analyzed is quite general rigid frame consisting of straight prismatic members, but, it should not be contained internal hinge. The source program is written in the FORTRAN language, and a example is given to prove this program to be correct. And the detail of source program and the example is included in appendix.

          • 마이콤에 의한 小形 펄스모터制御에 관한 硏究

            禹靖仁,李浚柝 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.1

            Micom is the most powerful and profitable tool for the control of the stepping motor as a small pulse motor. In this paper, it is reported that a series of controll programs, that is, the basic program and the programs for the C. W. and C. C. W. rotations and the limited operations, are developed. And the conclusions through these experiments have been obtained as follows. 1) The drive of the stepping motor is not only excution by Micom pulses, but the finding of the 1 phase, 2phase or 1-2 phase excited output is depended upon the instruction of out port. 2) The sequential control of the exciting phase and the C. W. and C. C. W. rotations of the Rotor through the shifted Accumulator Register inside C P U is excuted easily, and the developements of the control programs and the expansion of the Buffer Memory space make the limited operation and the speed control possible. 3) Ultimately, by the closed loop drive of he stepping motor, when the patterns of the arbitrary selected step accelerations, constant speeds, decelerations and stop are memorized in the Micom Kit, the tracking operation of the open loop drive is possible.

          • 軸對稱 프리스트레스드 콘크리트 탱크와 彈性地盤과의 相互作用에 관한 硏究

            宋裕振 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1

            The axisymmetric prestressed concrete tanks on eleastic foundations are widely used in civil engineering structures because of their superior structural performance, economy and attractive appearance. In this paper it is attempted to get the practical solution for the axisymmetric prestressed concrete tanks on the elastic foundation by the finite element method. Winkler's model is used for the elastic foundation. Two types of elements, such as the cylinder element and the circular plate element having circular hole, are proposed for the elastic foundation to evaluate the soil structure interactions. Interpolation techniques are used to estimate the unknown equivalent nodal reactions from foundation to base plate by using parabolic shape functions. A finite element program has been completely developed and the results obtained by it are compared with analytical solution for the fixed cylinderical tank under hydraulic internal pressure. The results are in good agreement with each other. With the program developed by author, some examples are analyized and various structural characteristics for the types of structures are discussed.

          • 옹벽의 뒷채움 다짐의 영향에 대한 고찰

            鄭成敎 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1

            Recently, civil engineers have often compacted the materials backfilled behind retaining walls. In this case, should not be solved by the classical earth pressure theories which usually involves the assumption of an equivalent fluid pressure distribution. The simplified analytical method, which have been recognized the influence of compaction on lateral earth pressures, have been proposed by Ingold (1979). Ingold's theory is comparatively valid in spite of some drawbacks. In this paper, the effects of compaction on the design of retaining wall were represented and compared with those of the classical earth pressure theories.

          • 最小 에너지에 의한 動的特性調節

            金在雄 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

            To reduce the effect of various dynamic loads on structures, many active structural control approaches have been studied. The pole assignment theory which affct direct changes of dynamic modes can be used to provide solution to these problems. But, for multiinput systems, the constant gain feedback control to achieve disired closed loop poles is not generally unique. So an optimal feedback gain is to be found among all feasible choices, optimal in the sense that the energy requirement is minimized. So far, very little research has been directed towards solving this problem. The main difficulty might be that the relation between the eigenvalues to be assigned and the parameters of the feedback matrix is rather involved. In this paper, a method of pole assignment with minimum energy requirement for multiinput systems is considered.

          • MRC 材料의 力學的 特性에 관한 實驗的 硏究

            閔丙亨 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

            MRC(Wire Mesh Reinforced Cement) has been devised to have the enough strength, the elasticity and the resistance against the impact of the MRC with the wire mesh and steel rod arranged uniformly in the mortar. The aim of this study is the experimental examination of what the causes of the MRC's resistance against the impact and the MRC's strength are by using the materials are made of Korea.

          • 와이어 매시 레인포스트 시멘트에 관한 硏究

            閔丙亨,朴雲龍,金勇熙,鄭昌植 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

            This study has been performed on the selective method of materials for MRC and the various mechanical tests through the testing manufacture of MRC pontoon. And we have attempted the enlargement of use by it's merits.

          • 유전체 박막 산화알미늄의 절연파괴에 관한 연구

            李鍾憲,延圭浩 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1

            This study is to have measured the breakdown voltage into non-shorting after forming by anodizing from film thickness 1000Å to 8000A. As a result of this the breakdown voltage have widely been distributed in a forming voltage, and the relation of andodizing voltage and breakdown voltage has had a close one, and that have invested the electron fild strength by thickness. By the upper facts that the breakdown voltage by thickness is in inverse proportion to thickness.

          • 火災詩 高熱을 받은 鐵筋콘크리트 기둥의 耐力特性에 관한 硏究

            黃贊奎,朴鶴吉 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1

            This study is to establish analytical approximate method for reinforced concrete column which is composed of normal concrete and mild steel reinforcement SBD 41~51, during exposure to fire, based upon evaluation of the existing literature on this subject. The important factors which was considered in establishing an approximate expressions of strength reduction factors have been outlined. The influence of elevated temperatures on the material properties of reinforcement and concrete has been reviewed. The results are as follow 1. The strength reduction, for reinforced concerete column at high temperature, can be established and obtained by numerical analysis Method. 2. The strength capacity of fire-resistance in reinforced concrete column can easily be known to concrete reduction factor table of time dependence. 3. Relationship of fire-resistance time and covered thickness can be reasonably calculated. 4. This paper include hereafter problems-second order influential factors, which are involved in spalling, splitting and expension deformation

          • 潛熱 蓄熱槽의 性能向上에 관한 硏究

            金施帆 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.1

            A study is performed on the improvement of the rate of thermal energy storage in the phase change material. The storage unit is a double tube type heat exchanger : air in the inner tube and phase change material in the outer tude. The relevant conservation equations with the boundary conditions have been solved to obtain the temperature distribution and the phase change front from which the storage rates have been calculated. In the heat storage process, the heat storage ratio η_(S1) as the ratio of the energy stored in a fixed time to the heat storage capacity of the unit, and η_(S2), as a timeaveraged dffectiveness of the storage unit, are defined. η_(S1), is increasing as mass flow rate and volume fraction of the scrap is increased, and n_(S2) is increasing as mass flow rate is decreased and volume fraction of the scrap is increased. In the heat release process, the heat release ratio η_(r), as a measure of decreasing heat transfer rate, is defined. η_(r) is increasing as volume fraction of the scrap is increased and the mass flow rate is decreased. The effect of increased effective thermal conductivity due to scrap mixing is more significant in the heat release process than in the heat storage process.

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