Takayuki Teramoto

Beam Non-Uniformity Smoothing Using Density Valley Formed by Heavy Ion Beam Deposition in Inertial Confinement Fusion Fuel Pellet

We study the beam nonuniformity smoothing effect of radiation transport in the density valley formed by an ion-beam deposition in a heavy ion-beam inertial confinement fusion pellet by numerical simulations. The simulation results show that the radiation energy is confined in the density valley, and the beam nonuniformity can be smoothed out by the radiation transport along the density valley. In addition, an estimation for the Rayleigh-Taylor instability during the implosion phase is also presented.

A problem-solving environment (PSE) for distributed computing

A problem-solving environment (PSE) for a distributed high-performance computing (HPC) is proposed to help users to work on distributed computer environment. When users access and use distributed computers for scientific computations, the PSE tells users which computers are available and appropriate for their specific application software by using hardware and software informations specified. Then, the users deploy their software on the distributed computer systems. The software, which can be used later or available for other users, is plugged and pooled in the PSE application pool in order to enhance their reusability. The problem-solving process work flow (WF) is also stored in a case-based database (DB) in the PSE and then the case DB can be used to suggest a WF for users to solve their problems. The PSE may open a new flexible HPC environment.

Visual Steering of the Simulation Process in a Scientific Numerical Simulation Environment NCAS

NCAS, an interactive problem solving environment (PSE), visualizes and steers the simulation process. Via the interactive PSE, scientists and engineers can perform a discretization of basic equations, design and generate a simulation program, perform and steer computations, and visualize the simulation results in real time. NCAS also generates a domain-decomposition parallel program using MPI functions from a mathematical model. The steering and visualization capabilities are accomplished via a tree-type data structure for equations, symbols and processes. Utilizing the NCAS system, quick responses to the user’s steering are realized and potential errors are avoided.

A Distributed Education-Support PSE System

Network-based learning or e-Learning has been taking an important role in education as helpful education tools. However, it is difficult for teachers to retrieve education data from students or to obtain data from the student activities. Therefore, we have developed a problem solving environment (PSE) for the education and learning support: TSUNA-TASTE (Gallopoulos et al., 1991). The TSUNA-TASTE system collects the system-usage situation, the information for the windows used and the operation situation of the mouse and key board of all students. The data, which the system TSUNA-TASTE collects, are stored in a database on the TSUNA-TASTE system server. In this paper we present the structure of the TSUNA-TASTE system and detail structure of the network in the TSUNA-TASTE. The TSUNA-TASTE supports teachers and students in computer-based education. The TSUNA-TASTE may open a new helpful e-Learning world.

A distributed problem solving environment (PSE) for scientific computing

A distributed problem solving environment (PSE) is proposed to help users solve partial differential equation (PDE) based problems in scientific computing. The system inputs a problem description and outputs a program flow, a C-language source code for the problem and also a document for the program. Each module is distributed on distributed computers. The PSE contains all the information of the problem, PDEs, discretization scheme, mesh information, equation manipulation results, designed program structure, variable and constant definitions and program itself. Therefore the documentation support module generates a document for the generated program and the problem itself in the PSE. The module liaison module generates an adapter module among the distributed PSE modules. The job execution service module deploys programs generated or prepared on distributed computer resources and helps users run the programs on the distributed computers. The concept of the distributed PSE extends the potential of conventional PSE systems

Mathematical Modeling Support in a Distributed Problem Solving Environment for Scientific Computing

In computing sciences (e-Sciences) we need computer power, excellent algorithms and programming power in order to solve scientific problems leading to discoveries and development of innovative new products. So far, the computer power and the computing algorithms have been developed incredibly, and have provided enormous contributions to e-Sciences and e-Productions. Problem solving environments (PSE) support the programming power in e-Sciences and e-Productions, and have been studied actively for a few decades. In this paper a distributed PSE, named D-NCAS is presented, and a computer-assisted mathematical modeling support is also discussed in D-NCAS, which helps users solve partial differential equation (PDE) based problems in scientific computing. The D-NCAS PSE inputs a problem description and outputs a program flow, a C-language source code for the problem and also a document for the program. Each PSE module is distributed on networklinked distributed computers. The PSE holds all the information of the problem: PDEs, discretization scheme, mesh information, equation manipulation results, designed program structure, variable and constant definitions and program itself. The PSE concept has been opening a new direction for the computer-assisted programming or development of scientific simulation programs or CAEs.