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In the design of high frequency high efficiency dc power supply, core losses in magnetic components becomes an important design consideration. A simple in-house experimental setup consisting of a.n impedance analyzer and a PC computer for determining core loss of Mn-Zn magnetic materials under sinusoidal excitation is proposed here. The power requirement for this measurement is small. The method using compensating technique provides reasonably accurate result as the determination of core loss is not significantly affected by the parasitic of the measuring apparatus especially when measurement is done at high frequency. l.INTRODUCTION

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Multi-cellular aggregation is a fundamental phenomenon observed in many biological processes. Investigating cells aggregation helps us to have better understanding of many biological processes. Moreover, it is useful in finding cure for the diseases caused by cells aggregation. In this paper, we present a control methodology to obtain multi-cellular aggregation by using multiple optical trapping. The proposed method is also useful for study of multiple cell fusion which is an important cellular process. Experimental results are presented to show the effectiveness of the proposed method in achieving multi-cellular aggregation.