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김종수,조강래,Kim, J.S.,Cho, K.R. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.2
The effects of duct inlet conditions on fan characteristics and upper wind velocity fields were investigated for two kinds of impellers. As the duct inlet condition, the relative positions between duct inlet and fan impeller and the size of baffle plate mounted on a duct inlet were selected. The 3-dimensional velocity components in flow fields were measured by a 5-holes pitot tube. From the results of measurements, it was found that the size of baffle plate scarecely effect on upper wind flow fields and characteristics of fan. It was also confirmed that the upper wind velocity distributions can be estimated by the potential flow field with large baffle plate at duct inlet.
김종수,강정길,Kim, J.S.,Kang, J.K. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.4
Recently, automotive air conditioning system manufacturers have been made a great efforts on the system compactness and high efficiency. This growing interest comes improvements in evaporator thermal performance, one of the most important factors affecting the performance of air conditioning system. In order to improve design of compact type evaporator, this study executes performs to develop a computer program for evaporator thermal performance prediction of automotive air conditioning system. The brief summaries of this study are as follows: 1) To predict the overall thermal performance of serpentine type evaporator, the new simulating method is developed. 2) The calculations are performed as functions of oil mass concentration and refrigerant two-phase distribution at inlet manifold of evaporator. 3) The validity of this simulating program is confirmed by comparing the predicted thermal performance results to experimental results of practical available evaporator. 4) Based on these results, suggestions are made to improve the thermal performance of evaporator.
퍼지제어기를 사용한 영구자석 동기전동기의 센서리스 속도제어
김종수(J.S.Kim),조시열(S.Y.Zoo),김성환(S.H.Kim) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
In recent years there has been a significant development of permanent magnet synchronous motors. Generally, a PMSM requires rotor position sensors for commutation and current control, but they increase cost and size of the motor. So in these day, sensorless speed control methods of PMSM have been studied for several environmental conditions. Many sensorless control algorithms use voltage equation and dynamic equation of mathematically modeled PMSM. Because the controller has no information about rotor position without position sensor, the controller determines the applied voltage according to the hypothetical rotor position. And the analysis shows that the difference between actual and hypothetical voltage is proportional to the angular difference between hypothetical and actual rotor position. Therefore, self-synchronization is possible by reducing the voltage difference to zero. Futhermore, this paper uses the Fuzzy Logic Controller for robust speed control of PMSM. Simulation results confirm the validity of this control algorithm.
박막 형광체 ZnGa₂O₄:Mn<SUP>2+</SUP>의 RF Magnetron Sputtering법을 이용한 생장
김종수(J. S. Kim),이성훈(S. H. Lee),박재홍(J. H. Park),박형원(H. W. Park),최진철(J. C. Choi),박홍이(H. L. Park) 한국진공학회(ASCT) 2006 Applied Science and Convergence Technology Vol.15 No.4
RF magnetron sputtering법을 이용하여 quartz 기판 위에 spinel 구조의 ZnGa₂O₄:Mn<SUP>2+</SUP> 박막 형광체를 상온에서 증착 하였다. 후 열처리 온도에 따라 박막의 결정성, 표면 거칠기와 조성비가 변하였으며 이는 박막 형광체의 발광특성에 영향을 주었다. 후 열처리 온도가 500 ℃에서 900 ℃로 올라감에 따라, 후 열처리 온도가 700 ℃일 때 가장 낮은 수치의 표면 거칠기를 보였고 이로 인한 낮은 외부 양자 효율로 인하여 발광특성이 좋지 않았다. 후 열처리 온도가 800 ℃일때 결정화 정도가 좋았으며 적당한 표면 거칠기와 화학적 조성비로 인해 최적의 발광특성을 보였다. 반면 후 열처리 온도가 900 ℃일 때 결정성은 가장 좋았으나 Zn의 높은 증기압으로 인한 화학적 조성비의 깨짐으로 발광특성이 좋지 못하였다. Thin-film ZnGa₂O₄:Mn<SUP>2+</SUP> phosphors of spinel structure were grown on quartz substrate by RF magnetron sputtering method at room temperature. As an increase of post-annealing temperatures, crystallinity, surface roughness and stoichiometry of thin films were varied. At the post-annealing temperatures of 500 ℃ and 600 ℃, the luminescence intensity was poor due to the poor crystallinity. The smallest surface roughness was observed at the sample post-annealed at 700 ℃ leading to low external extraction efficiency, and poor luminescence intensity. The highest luminescence intensity was shown at the sample post-annealed at 800 ℃. It was because both the surface roughness and crystallnity were optimized. On the other hand, at 900 ℃, the luminescence intensity was poor due to the violation of stoichiometry.