Hiroyuki Mizuno

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In a speed-adaptive threshold-voltage CMOS (SA-Vt CMOS) circuit, the substrate bias is controlled so that delay in the circuit stays constant. Distributions of device speeds are squeezed under fast-operation conditions. With a ring oscillator using 0.25-µm CMOS devices as a test circuit, we found that the worst-case operating frequency was improved(More)
Power efficient SoC design for embedded applications requires several independent power-domains where the power of unused blocks can be turned off. An SoC for mobile phones [1] defines 23 hierarchical power domains but most of the power domains are assigned for peripheral IPs that mainly use low-leakage high-Vt transistors. Since high-performance(More)
In fission yeast, we identified two genes, named ecl2+ and ecl3+, that are paralogous to ecl1+, which extends the chronological lifespan. Both ecl2+ and ecl3+ extend the chronological lifespan when overexpressed as ecl1+. ecl2+ and ecl3+ encode 84- and 89-amino acid polypeptides respectively that are not annotated in the current database. The Ecl2 protein(More)
A hierarchical power distribution methodology that enables more than dozen power domains in a chip and a power management scheme using 20 power domains are described. This method can achieve very low leakage current in the partial active mode of a single chip mobile processor. The single chip mobile processor embedded three CPU's that is baseband processor,(More)
A new computing architecture based on a ground-state search of the Ising model and the probabilistic behavior of a memory cell is proposed. To improve computer performance, a spatial computing architecture that defines an Ising model as the interface between software and hardware is proposed. Various problems can be represented as a spatial parameter in the(More)
Improvements to the performance of conventional computers have mainly been achieved through semiconductor scaling; however, scaling is reaching its limitations. Natural phenomena, such as quantum superposition and stochastic resonance, have been introduced into new computing paradigms to improve performance beyond these limitations. Here, we explain that(More)