Toshihiro Uehara

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Scalable compression algorithms, such as JPEG, can compress images to different quality or resolution levels so that the target systems with different display capabilities, can display the image. Digital watermarking is widely used for protection of copyright and identification of ownership on digital images. It is desirable to have scalable watermarking(More)
In this paper, we propose a nonstop system upgrade method without significant performance degradation for data management software. To reduce disk accesses and network traffic, we construct logical nodes inside a physical node and migrate data between the symbiotic logical nodes. This logical migration is assisted by storage management functions that hide(More)
In this paper, we discuss access forwarding schemes for the replication that achieve balanced access load distribution for data replicas on multiple storage nodes. In parallel storage systems, it is significant to handle skew of accessrequest distribution. Although replication is commonly used to solve such problems, it decreases hit ratios of cache(More)
In this paper, a method of balancing both access frequency and data amount for a distributed parallel storage system under version management is discussed. We assume the version management method keeps the latest version of file and a number of differential information sets to access previous versions. Since the access frequency for an aged version is tend(More)
Data dependence analysis (DDA) is essential for any automatic parallelizing compiler to determine parallelizability of given portions of programs. Several techniques and tests to analyze data dependence between array elements have already been proposed. It is clear that when one examines these conventional DDA techniques, there exists a trade-off between(More)
In order to provide a fully-autosmutic parullelzing compiler with the furiction of both automatic datu partitioning and distribution, we propose a compilercontrolled cache only memory architecture (cc-COMA). The cc-COMA runtime system as based on a softwure-emulated COMA which covers a variety of parallel architectures from NUMA to NOW. The compiler(More)
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