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In this paper, we describe the architecture and performance of the GRAPE-6 system, a massively-parallel special-purpose computer for astrophysical N-body simulations. GRAPE-6 is the successor of GRAPE-4, which was completed in 1995 and achieved the theoretical peak speed of 1.08 Tflops. As was the case with GRAPE-4, the primary application of GRAPE-6 is(More)
As an entry for the 2000 Gordon Bell performance prize, we report the performance achieved on a prototype GRAPE-6 system. GRAPE-6 is a special-purpose computer for astrophysical N-body calculations. The present configuration has 96 custom pipeline processors, each containing six pipeline processors for the calculation of gravitational interactions between(More)
Shear stress stimulus is expected to enhance angiogenesis, the formation of microvessels. We determined the effect of shear stress stimulus on three-dimensional microvessel formation in vitro. Bovine pulmonary microvascular endothelial cells were seeded onto collagen gels with basic fibroblast growth factor to make a microvessel formation model. We observed(More)
50-GHz-spaced, 32-channel, 10-Gb/s transmission in the zero-dispersion region over 80/spl times/80 km of 1.55-/spl mu/m dispersion-shifted fiber was successfully conducted by employing distributed Raman amplification. This paper demonstrates a feasibility of dense WDM systems in zero-dispersion region.
  • M. Koga
  • 1999
The 320-Gbit/s pre-prototype photonic system throughput is categorized by an upper set of parameters. In order to realize the anticipated number of WDM channels, tera-bit per second throughput capability is demanded. We show an architecture that promises wavelength expandability. It is based on an 8/spl times/8 delivery and coupling type optical switch, and(More)
The optical frequency drift allowed against the channel spacing was estimated for WDM system design. Our multiwavelength simultaneous monitoring circuit holds the frequency drift within a few giga-herz. This drift range is sufficient to realize the WDM systems that offer the spectrum efficiency of 0.2. We also demonstrated an accurate optical frequency comb(More)
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