Tsubasa Nakatsuka

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This paper shows the performance evaluation of the mathematical formula recognition system applied to a large scale of printed formula images, which has been developed in our laboratory. Our laboratory has collaborated with Michler of University of Essen, Germany, on project of "Retro-digitalization of mathematical journals, and their integration searchable(More)
It is important to estimate conductivity and permittivity of formation around a borehole. Arrival time and amplitude of the direct wave in single-hole borehole radar is related to the electromagnetic parameters. In this paper, we propose a liner array of dipole antenna elements in a borehole for a receiver. We introduced an optical modulator to transfer the(More)
We propose an ultra-low distortion 3P2T antenna switch MMIC for dual-band W-CDMA systems. The switch MMIC consists of a GaAs MMIC with 0.4 /spl mu/m-gate p-HEMT and Si CMOS IC with a decoder and charge pump circuit. Ultra-low distortion and low insertion loss were achieved by controlling 2-stacked FETs with a voltage of 7 V up-converted from a supply(More)
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