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RISS 인기검색어
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- 저자 : Kitsuregawa, Masaru (검색결과 4 건)
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Scalable Tape Archiver and its Application to Satellite Image Database
Nemoto, Toshihiro,Kitsuregawa, Masaru,Takagi, Mikio 대한원격탐사학회 1996 International Symposium on Remote Sensing Vol.12 No.1
In this paper, we describe the design and implementation of the scalable tape archiver, which we are now constructing for satellite image database. The scalable tape archiver connects as many number of 8mm tape archivers (element archivers) as possible. In the scalable tape archiver, robotics can exchange a cassette tape between two adjacent element archivers mechanically. To use the tape drives efficiently and to locate frequently accessed cassettes in appropriate positions, two load balancing mechanisms, foreground migration and background migration, are introduced to the scalable tape archiver. The foreground migration is to transfer a cassette in an element archives to another element archives whose drives are free when all of the drives in the element archives are busy The background migration is to transfer a cassette to redistribute frequently accessed cassettes when the archives is not busy Both migration strategies can reduce access response time and improve robustness of drive failures. In addition, we explain the user interface of satellite image database using our experimental scalable tape archives. We connect the scalable tape archives and World Wide Web server. Therefore, users can access our satellite image database system through WWW easily.
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Effectiveness of tape migration for satellite image database
Nemoto, Toshihiro,Kitsuregawa, Masaru 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
In this paper, we present a tape migration mechanism for a scalable tape archiver and its performance evaluation using access logs of our satellite image database through networks by WWW (World Wide Web), gopher and FTP. Simulation results show that the tape migration mechanisms can make the average response time of the scalable tape archiver shorter than sufficient cache disks. Especially, the tape migration is very efficient for the simultaneous accesses to the sequential images observed at a period because the tape migration mechanisms make it possible to access the tapes storing the sequential images in parallel even if they are in an element archiver, while the cache mechanisms is not effective. Additionally, the tape migration and the cache disks supplement with each other. Using both of them improves performance of the scalable tape archiver furthermore.
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Visualization System for Earth Environmental Data Base
Ikoma, Eiji,Kitsuregawa, Masaru 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
The earth's environmental problems have attracted serious attention worldwide. Various kinds of environmental data, such as remote sensing data, have become available for examining. Although this data is crucial to understanding such problems, there has become an over-abundance in variety of size, format, and filetype which makes it difficult for researchers to handle. We feel that earth environmental researchers should not be burdened by such cumbersome tasks. Therefore, we are developing a digital library for earth environmental information and a VRML based data visualization system for it. Even now, content-based image retrieval systems have many problems attributed to the degree of difficulty in implementing them. Thus, we are trying to visualize this data so that researchers can utilize it more efficiently, effectively, and easily. A great advantage for VRML users is that people can see environmental data from any perspective above the earth and with any resolution easily. Also by using MPEG-movie, users can observe the changes of data drawn from time series files.
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Partial Migratable Hierarchical File System for Satellite Image Database
Nemoto, Toshihiro,Sako, Kazuhiko,Kitsuregawa, Masaru,Takagi, Mikio 대한원격탐사학회 1995 International Symposium on Remote Sensing Vol.11 No.1
Recent attention on global environmental changes has stimulated the development of large scale global information systems. Satellite images play a very important role for understanding these global changes. We designed and implemented a partially migratable file system based on 8mm tape robotics for satellite image database. The file system migrates only the necessary portion of a file onto the disk. Two real application programs: radiometric/geometric correction and NDVI (Normalized Difference Vegetation Index) generation, were chosen and executed using our experimental file system. Large performance improvements were achieved when compared to the conventional file level migration scheme.
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