• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.161-163
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• 2006

This paper presents the experiment and the characteristics analysis of an electromagnetic pump using linear induction motor(LIM). The characteristics of LIM pump are analyzed solving the hydrodynamic equation at constant magnetic flux. The molten zinc is used in the experiment and the experimental results are compared with the analysis.

• Journal of the Korean Vacuum Society
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• v.3 no.2
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• pp.173-178
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• 1994

박막성장을 위한 초고진공 응용시스템을 제작하고 이것의 특성을 사중극질량분석계로 측정하였 다. 초고진공 시스템을 박막성장에 활용하기 위해서는 챔버 뿐만 아니라 펌프, 이온게이지, 전자총 등도 베이킹이 요구되었다. 또한 이온게이지와 전자총은 적어도 박막성장 20분전에 탈가스를 하여야함을 알 았다. 이 시스템으로 달성된 진공도는 7x10-11 torr이었다.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.691-692
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• 2006

The electromagnetic pump can transfer molten metals by the electromagnetic force of LIM for molten metals, which are zinc, tin and aluminum. The speed and quantity of the flow are analyzed using magnetohydrodynamics. The molten zinc is used in the experiment and the experimental results are compared with the analysis.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.80-82
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• 2005

This paper presents the characteristics analysis of an electromagnetic pump using a linear induction motor(LTM). The characteristics of the pump for three molten metals Is analyzed by the magneto hydro dynamics: flow velocity, flow mass and etc. The result of the analysis is that the flow velocity for three molten metals is over 0.3[m/s] at the center of duct.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.142-144
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• 1999

This work deals with an application of linear induction motor. In the process of making steel, the molten zinc is required to flow by electromagnetic force. For this purpose, the characteristics of a single sided linear induction motor are analyzed at various conditions.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.744-746
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• 2000

This paper presents an optimum design of a linear induction motor(LIM) using genetic algorithm(GA). Sequential unconstrained minimization technique(SUMT) is used to transform the nonlinear optimization with constraints to a simple unconstrained problem. The objective functions of LIM such as trust, weight are optimized and the result was applied to the design of linear induction pump.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.878-879
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• 2007

This paper presents an optimum design of the electromagnetic pump with an tubular type linear induction motor(TLIM). For obtaining the maximum flow rate, the TLIM is optimized using genetic algorithm.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1318-1320
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• 2005

This paper presents the characteristics analysis of an electromagnetic pump using the linear induction motor(LIM). The characteristics of the pump are analyzed solving two equations : the electromagnetic equation and hydrodynamic one.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.39 no.3
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• pp.1-7
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• 2002

This paper presents a new PLL clock generator that can improve a jitter noise characteristics and acquisition process by designing a multi-PFD(Phase Frequency Detector) and an adaptive charge pump circuit. The conventional PLL has not only a jitter noise caused from such a demerit of the wide dead zone and duty cycle, but also a long delay interval that makes a high speed operation unable. An advanced multi-structured PFD circuit using the TSPC(True Single Phase Clocking) circuit is proposed, in which it shows an excellent functionalities in terms of the jitter noises by designing its circuit with the exact dead zone and duty cycle. Our new designed adaptive charge pump in the loop filter of a PLL can improve an acquisition characteristic by adaptively increasing of current. The Hspice simulation is done to evaluate the performance of the proposed circuit. Simulation result shows that our PLL has under 0.01ns in the dead zone, no influence from the duty cycle of input signals and under 50ns in the acquisition time. This circuit will be able to be used in develops of high-performance microprocessors and digital systems.  

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.2
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• pp.133-138
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• 2017

This paper presents a jitter characteristic improved phase locked loop (PLL) with an RC time constant circuit. In the RC time constant circuit, LPF's voltage is inputted to a comparator through small and large RC time constant circuits. The signal through a small RC time constant circuit has almost same loop filter output voltage. The signal through a large RC time constant circuit has the average value of loop filter output voltage and does as a role of reference voltage to the comparator. The output of the comparator controls the sub-charge pump which provide a current to LPF. When the loop filter output voltage increases, the sub-charge pump discharges the loop filter and decreases loop filter output voltage. When the loop filter output voltage decreases, the sub-charge pump charges the loop filter and increases loop filter output voltage. The negative feedback loop reduces the variation of loop filter output voltage resulting in jitter characteristic improvement.