Environmental effect on the subhalo abundance -- a solution to the missing dwarf problem (2007)
Ishiyama, Tomoaki, Fukushige, Toshiyuki, Makino, Junichiro
Recent high-resolution simulations of the formation of dark-matter halos have shown that the distribution of subhalos is scale-free, in the sense that if scaled by the velocity dispersion of the...
PGPG: An Automatic Generator of Pipeline Design for Programmable GRAPE Systems (2007)
Hamada, Tsuyoshi, Fukushige, Toshiyuki, Makino, Junichiro
We have developed PGPG (Pipeline Generator for Programmable GRAPE), a software which generates the low-level design of the pipeline processor and communication software for FPGA-based computing...
GRAPE-6A: A single-card GRAPE-6 for parallel PC-GRAPE cluster system (2005)
Fukushige, Toshiyuki, Makino, Junichiro, Kawai, Atsushi
In this paper, we describe the design and performance of GRAPE-6A, a special-purpose computer for gravitational many-body simulations. It was designed to be used with a PC cluster, in which each node...
PPPM and TreePM Methods on GRAPE Systems for Cosmological N-body Simulations (2005)
Yoshikawa, Kohji, Fukushige, Toshiyuki
We present Particle-Particle-Particle-Mesh (PPPM) and Tree Particle-Mesh (TreePM) implementations on GRAPE-5 and GRAPE-6A systems, special-purpose hardware accelerators for gravitational many-body...
Mass Loss Timescale of Star Clusters in External Tidal Field (2004)
Tanikawa, Ataru, Fukushige, Toshiyuki
We investigate evolution of star clusters in external tidal field by means of $N$-body simulations. We followed seven sets of cluster models whose central concentration and strength of the tidal...
Makino, Junichiro, Fukushige, Toshiyuki, Koga, Masaki, Namura, Ken
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...
Fukushige, Toshiyuki, Kawai, Atsushi, Makino, Junichiro
We investigate the structure of the dark matter halo formed in the cold dark matter scenarios by N-body simulations with parallel treecode on GRAPE cluster systems. We simulated 8 halos with the mass...
A 29.5 Tflops simulation of planetesimals in Uranus-Neptune region on GRAPE-6 (2002)
Junichiro Makino, Eiichiro Kokubo, Toshiyuki Fukushige
As an entry for the 2002 Gordon Bell performance prize, we report the performance achieved on the GRAPE-6 system for a simulation of the early evolution of the protoplanet-planetesimal system of the...
Fukushige, Toshiyuki, Makino, Junichiro
We investigate the structure of the dark matter halo formed in three different cold dark matter scenarios. We performed N-body simulations of formation of 13 cluster-sized halos. In all runs, density...
A 11.55 Tfiops simulation of black holes in a galactic center on GRAPE-6 (2001)
Junichiro Makino, Toshiyuki Fukushige
As an entry for the 2001 Gordon Bell performance prize, we report the performance achieved on the GRAPE-6 system for the simulation of the dynamical evolution of a multiple black hole system in the...
Fukushige, Toshiyuki, Suto, Yasushi
We report on the detailed analysis of the mean-pairwise peculiar velocity profile in high-resolution cosmological N-body simulations ($N=8.8\times 10^6$ particles in a sphere of $50 \sim 200$Mpc...
Structure of Dark Matter Halos From Hierarchical Clustering (2000)
Fukushige, Toshiyuki, Makino, Junichiro
We investigate the structure of the dark matter halo formed in the cold dark matter scenario using $N$-body simulations. We simulated 12 halos with the mass of $6.6\times 10^{11}M_{\odot}$ to...
A 1.349 Tflops simulation of black holes in a galactic center on GRAPE-6 (2000)
Junichiro Makino, Toshiyuki Fukushige, Masaki Koga
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....
$7.0/Mflops Astrophysical N-Body Simulation with Treecode on GRAPE-5 (1999)
Atsushi Kawai, Toshiyuki Fukushige
As an entry for the 1999 Gordon Bell price/performance prize, we report an astrophysical N-body simulation performed with a treecode on GRAPE-5 (Gravity Pipe 5) system, a special-purpose computer for...
GRAPE-5: A Special-Purpose Computer for N-body Simulation (1999)
Kawai, Atsushi, Fukushige, Toshiyuki, Makino, Junichiro, Taiji, Makoto
We have developed a special-purpose computer for gravitational many-body simulations, GRAPE-5. GRAPE-5 is the successor of GRAPE-3. Both consist of eight custom pipeline chips (G5 chip and GRAPE...
PROGRAPE-1: A Programmable, Multi-Purpose Computer for Many-Body Simulations (1999)
Hamada, Tsuyoshi, Fukushige, Toshiyuki, Kawai, Atsushi, Makino, Junichiro
We have developed PROGRAPE-1 (PROgrammable GRAPE-1), a programmable multi-purpose computer for many-body simulations. The main difference between PROGRAPE-1 and "traditional" GRAPE systems is that...
7.0/Mflops Astrophysical N-Body Simulation with Treecode on GRAPE-5 (1999)
Kawai, Atsushi, Fukushige, Toshiyuki, Makino, Junichiro
As an entry for the 1999 Gordon Bell price/performance prize, we report an astrophysical N-body simulation performed with a treecode on GRAPE-5 (Gravity Pipe 5) system, a special-purpose computer for...
High-Performance Special-Purpose Computers in Science (1998)
The next decade will be an exciting time for computational physicists. After 50 years of being forced to use standardized commercial equipment, it will finally become relatively straightforward to...
High-Performance Special-Purpose Computers in Science (1998)
The next decade will be an exciting time for computational physicists. After 50 years of being forced to use standardized commercial equipment, it will finally become relatively straightforward to...
High-Performance Special-Purpose Computers in Science (1998)
Fukushige, Toshiyuki, Hut, Piet, Makino, Jun
The next decade will be an exciting time for computational physicists. After 50 years of being forced to use standardized commercial equipment, it will finally become relatively straightforward to...
On the Mass Distribution of Planetesimals in the Early Runaway Stage (1998)
Junichiro Makino, Toshiyuki Fukushige, Yoko Funato
We derive the stationary distribution of the mass of planetesimals from the coagulation equation under the assumption of energy equipartition. In the threedimensional case, we found that the...
On the Mass Distribution of Planetesimals in the Early Runaway Stage (1998)
Junichiro Makino, Toshiyuki Fukushige, Yoko Funato
We derive the stationary distribution of the mass of planetesimals from the coagulation equation under the assumption of energy equipartition. In the threedimensional case, we found that the...
On the Mass Distribution of Planetesimals in the Early Runaway Stage (1998)
Junichiro Makino, Toshiyuki Fukushige, Yoko Funato
We derive the stationary distribution of the mass of planetesimals from the coagulation equation under the assumption of energy equipartition. In the threedimensional case, we found that the...
The PCI Interface for GRAPE Systems: PCI-HIB (1997)
Atsushi Kawai, Toshiyuki Fukushige, Makoto Taiji, Junichiro Makino
We developed a PCI interface for GRAPE systems. GRAPE(GRAvity piPE) is a special-purpose computer for gravitational N-body simulations. A GRAPE system consists of GRAPE processor boards and a host...
N-body Simulation of Galaxy Formation on GRAPE-4 Special-Purpose Computer (1996)
Fukushige, Toshiyuki, Makino, Junichiro
We report on resent N-body simulations of galaxy formation performed on the GRAPE-4 (GRAvity PipE) system, a special-purpose computer for astrophysical N-body simulations. We review the astrophysical...
On the Origin of Cusps in Dark Matter Halos (1996)
Fukushige, Toshiyuki, Makino, Junichiro
Observed cusps with density profiles $\rho\propto r^{-1}$ or shallower, in the central regions of galaxies, cannot be reproduced in the standard Cold Dark Matter (CDM) picture of hierarchical...
The Effect of Gravitational Scattering on the Anisotropy of the Cosmic Background Radiation (1994)
Fukushige, Toshiyuki, Makino, Junichiro, Ebisuzaki, Toshikazu
The homogeneity of the cosmic microwave background radiation (CBR) is one of the most severe constraint for theories of the structure formation in the universe. We investigated the effect of the...
Exponential Growth of Distance between Nearby Rays due to Multiple Gravitational Scatterings (1994)
Fukushige, Toshiyuki, Makino, Junichiro
We give an estimate of the relative error in the angular measurement of observations for high redshift objects induced by gravitational scatterings (lensing). Gunn (1967) concluded that the...
Pre-Collapse Evolution of Galactic Globular Clusters (1994)
Fukushige, Toshiyuki, Heggie, Douglas C.
This paper is concerned with collisionless aspects of the early evolution of model star clusters. The effects of mass loss through stellar evolution and of a steady tidal field are modelled using...