Kazuya Matsumoto

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—OpenCL (Open Computing Language) is a framework for general-purpose parallel programming. Programs written in OpenCL are functionally portable across multiple processors including CPUs, GPUs, and also FPGAs. Using an auto-tuning technique makes performance of OpenCL programs also portable on different processors. We have developed an auto-tuning system(More)
Contribution ◮ Blocked algorithm for the all-pairs shortest (APSP) paths problem for a hybrid CPU-GPU system. ◮ Applicable to solve the APSP problem even when the required memory size is larger than GPU's memory capacity. ◮ Fastest among existing APSP solutions on large dense graphs. ◮ Discussion on required memory bandwidth for the blocked algorithm. The(More)
SUMMARY The All-Pairs Shortest Paths (APSP) problem is a graph problem which can be solved by a three-nested loop program. The Cell Broadband Engine (Cell/B.E.) is a heterogeneous multi-core processor that offers the high single precision floating-point performance. In this paper, a solution of the APSP problem on the Cell/B.E. is presented. To maximize the(More)
The abundant pigment-protein membrane complex photosystem-I (PS-I) is at the heart of the Earth's energy cycle. It is the central molecule in the "Z-scheme" of photosynthesis, converting sunlight into the chemical energy of life. Commandeering this intricately organized photosynthetic nanocircuitry and re-wiring it to produce electricity carries the promise(More)
We analyzed the effects of age and sex on habitual sleep/wake rhythm and Morningness-Eveningness scores of 2,252 subjects (6-89 years) randomly selected in Shimonoseki, Japan. Subjects were divided into 21 age groups with a matching number of men and women in each age group. The most common sleep parameter patterns by age showed a v- or inverted v-pattern(More)
After fertilization, the sperm and oocyte genomes undergo extensive epigenetic reprogramming to form a totipotent zygote. The dynamic epigenetic changes during early embryo development primarily involve DNA methylation and demethylation. We have previously identified Gse (gonad-specific expression gene) to be expressed specifically in germ cells and early(More)
During the maternal-to-zygotic transition (MZT), maternal proteins in oocytes are degraded by the ubiquitin-proteasome system (UPS), and new proteins are synthesized from the zygotic genome. However, the specific mechanisms underlying the UPS at the MZT are not well understood. We identified a molecule named zygote-specific proteasome assembly chaperone(More)
The exocytosis of insulin from pancreatic beta-cells is closely related to intracellular elevation of Ca(2+). The effects of Ca(2+) may be mediated by Ca(2+)/calmodulin-dependent protein kinase II (CaMKII). Four subunits of CaMKII, termed alpha, beta, gamma, and delta, are encoded by distinct genes, and various isoforms of these subunits exist as different(More)