Toshihiro Sasada

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We study the condition for the appearance of space-time supercharges in twisted sectors of asymmetric orbifold models. We present a list of the asymmetric ZN -orbifold models which satisfy a simple condition necessary for the appearance of space-time supercharges in twisted sectors. We investigate whether or not such asymmetric orbifold models possess N = 1(More)
An architecture for a high-speed Reed-Solomon decoder developed for digital VCRs is described. A maximum data rate of 16 MB/s and an error correction capability of 4-error- or 8-erasure-correction are realized using four-stage pipelines: a syndrome generator, a polynomial coefficient generator, a polynomial evaluator, and an error corrector. The polynomial(More)
We give various examples of asymmetric orbifold models to possess intertwining currents which convert untwisted string states to twisted ones, and vice versa, and see that such asymmetric orbifold models are severely restricted. The existence of the intertwining currents leads to the enhancement of symmetries in asymmetric orbifold models. ∗ To appear in(More)
Authors have developed a small digital camcorder deckmechunism for 1/4 inch width's tape. In this paper, the tape loading and transport mechanism suitable for very thin ME tape, the technology to suppress the noise caused by high speed drum rotation, and the wide band electromagnetic system are described.
We study whether orbifold models are equivalently rewritten into torus models in the case of fermionic string theories. It is pointed out that symmetric orbifold models cannot be rewritten into torus models in the case of fermionic string theories because of the absence of twist-untwist intertwining currents on the orbifold models. We present a list of(More)
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