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소성조건에 따른 MHz 대역의 Mn-Zn ferrite 전력손실 특성
서정주,송병무,Suh J.J.,Song B.M 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.6
소성온도를 $1150∼1320 ^{\circ}C$ 영역에서 변화시킨 결과 1MHz-25mT조건에서 전력손실의 절대값이 감소하였으며, 전력손실의 온도의 존성이 소성온도에 따라 다르게 관찰되었다 $1150 ^{\circ}C$에서 소성한 경우 전력손실의 최소가 나타나는 온도가 자기이방성 상수가 "0"이 되는 특정 온도에서 나타나지 않고 측정 온도가 증가함에 따라 증가되는 경향을 보였다. 이러한 원인은 1MHz 대역에서는 grain size에 따라 residual loss가 발생기구가 상이하기 때문으로 판단된다. $1150^{\circ}C$ 소성시 서로 다른 평형산소분압을 이용하여 분위기를 조정한 결과 산소분압이 증가됨에 따라 grain size 와 밀도가 미소하게 증가되는 경향을 보였다. 비저항과 투자율은 115$0^{\circ}C$ 소성시 평형산소분압에 따라 특정한 경향성을 나타내지 않았는데 이는 $Fe^{2+}$ 농도 변화이외에 미세구조의 변화를 동반하였기 때문으로 판단된다. 평형산소분압이 상대적으로 높게 유지된 시편의 경우 $100^{\circ}C$에서 상대적으로 낮은 전력손실값을 나타내었다.서 상대적으로 낮은 전력손실값을 나타내었다. The power loss characteristics of Mn-Zn ferrite were observed with the sintering temperature. In case of $1150 ^{\circ}C$ sintering, the core loss increased with measuring temperature, and does not have minimum value at the point where the magnetocrystalline anisotropy be 'zero'. This reason mainly due to the change of core loss mechanism with grain size which affects residual loss. The grain size and sintered density slightly increased with equilibrium oxygen partial pressure at$ 1150 ^{\circ}C$ sintering. The resistivity and initial permeability showed no significance with atmosphere, these results due to complex effect of $Fe^{2+}$ concentration and microstructure change. The core loss at $100^{\circ}C$ decreased as the equilibrium oxygen partial pressure increased.e increased.
서정주(J. J. Suh),왕우경(W. K. Wang),안수길(S. K. Ahn) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.3
The engine performance and combustion characteristics of diesel oil and fish oil blended with diesel oils were investigated at various blending rate of fish oil in a diesel engine. The maximum pressure showed no significant difference among test fuels at low load, but it was higher as the blending rate of fish oil increases at high load. Increasing the blending rnte of fish oil, the rate of heat release and burned fraction were higher than those of diesel oil. The ignition delay became longer than that of diesel oil as the blending rate of fish oil increases, and its difference were larger at different loads. The combustion duration and density of smoke were shorter and lower as the blending rate of fish oil increases. The rate of fuel consumption. showed no significant difference between diesel oil and fish oil blended with diesel oils.<br/>
서정주(J. J. Suh),왕우경(W. K. Wang),안수길(S. K. Ahn) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.1
The ignition delay of diesel oil and fish oil blended with diesel oils was investigated at various<br/> pressure and temperature conditions in a constant volume combustion bomb.<br/> The evaporation and combustion duration of diesel oil and fish oil blended with diesel oils were respectively different in high and low temperature.<br/> The dependence of ignition delay on the temperature was different in high and low temperature<br/> ranges which were divided at the 773 K.<br/> The dependence of ignition delay on the pressure was almost linear, regardless of the test fuels at the constant temperature(863K).<br/> The ignition delay became longer as the blending rate of fish oil increases at the constant temperature and pressure, but it was especially short with 20 % fish oil blended with diesel oils.<br/>
서정주(J.J.Suh),왕우경(W.K.Wang),안수길(S.K.Ahn) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The engine performance and combustion characteristics of diesel oil and fish oil blended with diesel oils was investigated at various<br/> blending rate of fish oil in a diesel engine. The maximum pressure<br/> showed no significant difference with test fuels at low load, and it was higher as the blending rate of fish oil increases at high load. The ignition delay became longer than that of diesel oil as the blending rate of fish oil increases, and its difference were larger at different loads. The combustion duration and smoke density in exhaust gas were shorter and lower as the blending rate of fish oil<br/> increases. The rate of fuel consumption showed no significant difference between with fish oil blended with diesel oils and diesel oil, and it was considerbly on the decrease at high load.<br/>
서정주(J.J.Suh),왕우경(W.K.Wang),안수길(S.K.Ahn) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
The ignition delay of diesel oil and fish oil blended diesel oils was investigated according to pressure and temperature in a constant volume combustion bomb.<br/> The evaporation and combustion duration of diesel oil and fish oil blended diesel oils were respectively different in high and low temperature.<br/> The dependence of temperature on the ignition delay was different in<br/> high and low temperature at the 773 K.<br/> The dependence of pressure on the ignition delay was almost linear,<br/> regardless of the test fuels at the constant temperature (a63. K).<br/> The ignition delay was almost longer as the blending rate of fish oil increase at the constant temperature and pressure, and it was no significant difference in high temperature and pressure.
여동준(D. J. Yeo),최명수(M. S. Choi),변정환(J. H. Byun),양정규(J. K. Yang),서정주(J. J. Suh) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, the authors formulated analytical algorithm for the in-plane free vibration of a annular plate with intermediate support part by the transfer influence coefficient method (TICM) which is based on the successive transmission of influence coefficients on nodal circumferences. To confirm the effectiveness of the suggested algorithm, we analyzed the free vibration of a annular plate with three typical intermediate support parts by the TICM and the Transfer matrix method (TMM) on a personal computer. The computational result was that the TICM was superior to the TMM in the in-plane free vibration analysis of a annular plate with rigid intermediate supports.
여동준(D. J. Yeo),최명수(M.S. Choi),변정환(J. H. Byun),서정주(J. J. Suh),양정규(J. K. Yang),문덕홍(D. H. Moon) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper deals with the free vibrations of folded plates by the transfer influence coefficient method. The governing equations of a non-circular cylindrical shell including a plate as special case are written in a coupled set of first order matrix differential equations using the transfer matrix. The Runge-Kutta-Gill Integration method are used to solve the governing differential equation. The natural frequencies and corresponding mode shapes are calculated numerically for the folded plate of various crank angles. And all boundary conditions and the intermediate supports between folded plate and foundation could be treated only by adequately varying the values of the spring constants.
최명수(M. S. Choi),여동준(D. J. Yeo),서정주(J. J. Suh),양정규(J. K. Yang),문덕홍(D. H. Moon) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In order to analyze accurately the forced vibration of a structure by using the finite element method (FEM), we have to model the structure as a numerical model with many degrees-of-freedom. However, in this case, the FEM needs much computation time and storage. The authors developed the finite element-transfer stiffness coefficient method (FE-TSCM) for overcoming the drawback of the FEM. In this paper, the authors apply the FE-TSCM to the in-plane forced vibration analysis of plates with various shapes. Two numerical examples, a rectangular plate and a triangular plate, are used to compare the results of the FE-TSCM and the FEM. Through the numerical calculation, we confirm that the FE-TSCM can be applied to the plates with various shapes and is effective to in-plane forced vibration analysis of plates.