K. Hirano

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Some new exact distributions on coupon collector's waiting time problems are given based on a generalized Pólya urn sampling. In particular, usual Pólya urn sampling generates an exchangeable random sequence. In this case, an alternative derivation of the distribution is also obtained from de Finetti's theorem. In coupon collector's waiting time problems(More)
| We describe a new multiport memory which is called Shared DRAM(SHDRAM) to solve bus-bottle neck problem in parallel processor system with shared memory. This SHDRAM has four ports. Therefore four processors can be directly connected to this memory without bus-bottle neck. The basic operation of SHDRAM is conrmed by computer simulation and measurement(More)
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