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      • 企業 附設 硏究所 活動實態에 관한 硏究 : 釜山·慶南地域을 中心으로

        河正鎭,黃圭完,申大赫,兪炳哲 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2

        The research institute of an enterprise attaches have been enlarged in korea. This study grasps the status and the research activity in the research institute of an enterprise attached in the Pusan and Kyungnam. So, we find the important role in the research institute of a enterprise attached.

      • 길이가 다르고 수직으로 엇갈린 등온평판에서의 혼합대류 열전달

        김상영,정한식,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        The effect of the interactive flow on convective heat transfer from vertically misaligned isothermal plates have been studied numerically by the finite difference method. The Reynolds numbers, Grashof numbers, the relative lengths, L₂/L₁, and the dimensionless plate spacing, b/L₁ are varied as parameters. The total mean Nusselt numbers increase as L₂/L₁ increases and Reynolds number increases. The optimum plate spacings move to the narrow spacing as Reynolds number increases and L₂/L₁ decreases.

      • 정사각빔을 가진 2차원 수평채널에서의 혼합대류

        이재신,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        Mixed Convection Heat Transfer are investigated from the numerical solution of Navier-Stokes and energy equations in a two-dimensional horizontal channel with a rectangular beam. The solutions have been obtained for dimensionless distances, Xe=1∼10, Reynolds numbers, Re=50∼500 and Grashof numbers, Gr=0∼5×10⁴. The results indicate that as Xe increases, the mean Nusselt numbers of upper and lower plates are significantly decreased at Xe<5 and then unchanged at Xe≥5. As Gr/Re² increases, the mean Nusselt numbers of beam and lower plate increase and those of upper plate decrease at Xe=5 and Re=100.

      • 中小河川의 洪水到達時間에 관한 硏究

        金熙鍾,閔丙亨 동아대학교 공과대학 부설 한국자원개발연구소 1975 硏究報告 Vol.1 No.1

        When the peak discharge of small and medium rivers is shown in the rational formula the mean intensity of rainfall depends on the time of concentration. Accordingly, the time of concentration should correctly be calculated in of order to obtain peak discharge with good accuracy. There is, however, no theoretical formula available, which gives the correct time of concentration, and empirical formulae are mainly used for determining it. In our country, Rziha formula has generally been use for a mountaineus region, and Kraven formula for a plain land. When these formulae mentioned above are, however, applied to small and medium rivers in Korea, the degree of accuracy obtained from these formulae is found to be low. After the authors have analysed a comparison between the measured times of concentration for small rivers in Busan area and small & medium rivers in the Nakdong basin, and the calculated values using two formulae given above together with the following formulae (1) American Society for Soil Preservation formula T_(c)=(0.868 L³/H)^(0.385) (2) Kirpich formula T_(C)=0.0001875 L^(0.77)/I^(0.385) (3) Japanese Civil Eng. Research Center formula T_(c)=1.67×10^(-3)(L/√I)^(0.7) for rural basin T_(c)=2.40×10^(-4)(L/√I)^(0.7) for urban basin, the conformity of T_(c)= m(L³/H_(0))^(n) type formula, which is obtained by I_(0)(- H_(0)/L), is found to better as a formula for the determination of time of concentration, as compared to that obtained by I(-H/L.) The formulae to be published for the time of concentration on small rivers in Busan area and small & medium revers in the Nakdong basin are as follows; 1. T_(c)(min)= 2.600(L³/H_(0))^(0.383) for small rivers in Busan area. 2. T_(c)(hr)=1.581(L³/H_(0))^0.(128) for small & medium rivers in the Nakdong basin where, L=length of river (㎞) H_(0)=2F/L(㎞) F=area between river bed line and horizontal line based at the practical target point in river profile (㎢)

      • A Study on Adaptive Motion Control of a Dual Arm Robot

        Lee, Kwon Soon,Lee, Suck Gyu 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        This paper describes a global plan for a dual arm robot to move from its starting position to its destination under some constraints without collision to pick up the simply shaped object at prespecified positions on it. The collision-free conditions between each parts of the robot and the object and the robot are studied. This paper concludes with some simulations and the design of self-tuning controller under the assumption that some parameters of the robot are uncertain.

      • 조건부선형시스템의 시스템 동정에 관한 연구

        이권순 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        A mathematical model of cancerous system based on immunological surveillance has been proposed by K. S. Lee. The model involves a system of 12 coupled nonlinear differential equations due to cellular kinetics and each of which can be modeled bilinearly. This paper discusses only the properties of solutions to the nonlinear differential equations and identification.

      • 구멍 가공시 발생되는 동적성분의 해석

        조규재,전언찬 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        This study was carried out to investigate the analysis of dynamic components in hole drilling. Materials used were carbon steel(SM45C), brass(BsBM) and cast iron(FC20), and the drills used were 4 kinds of HSS drill. The main purpose was focused on analysing the dynamic components at the starting point and end point drilling, and the reaction/anti-reaction forces at the end point.

      • A Study on the Prediction of Bone Remodeling of Plated-Human Femur using 3-Dimensional Finite Element method

        Kim, Hyun Su 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        뼈는 주변 여건에 따라 뼈의 재질 및 형상이 변하는 일종의 動的 구조물로서, 보철물이 부착되면 뼈의 응력상태가 달라져 새로이 骨재형성을 하게 된다. 특히 골절판 부착시 뼈의 접촉은 촉진되나, 그 부위의 응력 변화에 의하여 골절판과 부착된 부분의 뼈는 오히려 약화되는 골다공증 현상을 야기하기도 한다. 본 연구에서는 뼈의 응력변화와 骨재형성의 관계를 3차원 유한 요소법을 이용하여 관련시키고자 한다. 이는, 새로이 설계된 골절판 또는 어떤 보철물이, 비록 그 자체의 생체 적합성 및 충분한 강도를 갖게 되더라도 骨재형성에 미치는 영향을 판단할 근거가 요구된다고 사료되기 때문이다. 그래서, 현 사용되는 골절판을 인체 대퇴골에 부착된 3차원 유한 요소 모델을 제작하여, 응력 차이법에 의한 骨재형성의 경향을 조사하고, 그 경향을 기존 동물 실험 결과와 비교 검토하여, 본 연구의 타당성을 평가하여 보철설계의 역학적 기초를 확립하고자 한다.

      • 집열기 배관의 비정상열손실에 관한 연구

        변장환,배석태,김시범 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        In the metal pipe covered with insulation material, a study was made for the influences of heat capacity of pope, heat capacity of insulation material and insulation thickness on the transient heat loss. Also, approximate analysis which considered the system lumped heat capacity system was performed. As the heat capacity of pope, heat capacity of insulation material and insulation thickness increase, transient heat loss increases linearly. In case that the heat capacity of the pope much larger than that the insulation material, the results of the approximate analysis showed a good agreement with those of the numerical analysis.

      • 生物膜濾過 시스템에 의한 下水의 高度處理에 관한 연구

        姜龍太,李容斗,金正鉉 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.2

        The purpose of this research is to investigate the characteristics of Nitrogen and Phosphorus removal by Biofilm Filtration system. The results are summarized as follow. 1. Through Nitrification reaction in an Aerobic process and Denitrification reaction in an Anaerobic proces, NH₄-N and NO₃-N have been removed to approximately 95%, respectively, and the PO₄-P release occurred about 20% in the Anaerobic process. 2. For phosphorus removal, Flocculation-Sedimentation and Final Biofilm Filtration process have removed PO₄-P of 50~70% and 20~25%, respectively, at optimum conditions decided from batch experimentation. And total PO₄-P removal rates ranged from 80 to 90 percent through overall process. 3. Applying Biofilm Filtration system to conventional wastewater treatment system could be expected to be improved treated water quality. And the investigations on aluminium(Al) recover and sludge treatment are required, for the sludge treatment are required, for the sludge was formed as AlPO₄ and Al(OH)₃ due to the coagulation of it in Coagulation-Sedimentation process.

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