Shigeo Kawata

Learn More
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(More)
The conjugate gradient method incorporating the object-extent constraint is applied to image reconstruction of a three-dimensional object using an incomplete projection-data set. The missing information is recovered by constraining the solution with the knowledge of the outer boundary of the object-extent which may be a priori measured or known. The(More)
Biomolecular network is an important research subject of the bioinformatics. A crucial step in biological studies is to understand the biomolecular networks. Visualization is helpful for complex biomolecular network analysis because the network scale is rapidly expanding along with the growth of biological data sets. A novel biomolecular network(More)
This paper presents a method based on the use of an image sensor for obtaining the complex amplitudes of beams diffracted from an object at two different wavelengths. The complex amplitude for each wavelength is extracted by the Doppler phase-shifting method. The principle underlying the proposed method is experimentally verified by using the method with(More)
We study the high-energy (1-4 MeV) proton production from a slab plasma irradiated by a ultrashort high-power laser. In our 2.5-dimensional particle-in-cell simulations, a p-polarized laser beam of 1.6 x 10(19) W/cm(2), 300 fs, lambda(L)=1.053 microm, illuminates a slab plasma normally; the slab plasma consists of a hydrogen plasma, and the target plasma(More)
In this paper, we describe a problem solving environment (PSE) for grid computing called NAREGI-PSE in the NAREGI (National Research Grid Initiative) project, conducted by MEXT (Ministry of Education, Culture, Sports, Science and Technology) of Japan. NAREGI-PSE is researched and developed to support the scientists' works for scientific computer simulations(More)
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(More)