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Featured researches published by Keiichi Tamura.


international conference on parallel and distributed systems | 2001

The parallel processing of spatial selection for very large geo-spatial databases

Keiichi Tamura; Yuya Nakano; Kunihiko Kaneko; Akifumi Makinouchi

Earth science (ES) applications handle very large geo-spatial data sets and interactive response time is required by its query processing. Spatial selection is one of the very important basic operations for geo-spatial databases. It retrieves all the objects that intersect with a given point or rectangle. We present a novel approach for the parallel processing of spatial selection of very large geo-spatial databases using partitioned parallelism. To evaluate this approach, we use the Extended Sequoia 2000 benchmark, which has real world data and real queries. In addition, we use an actual object database management system, ShusseUo, which we developed previously. The experimental results of parallel processing of spatial selection show good speed-up.


Lecture Notes in Engineering and Computer Science | 2014

A New Density-based Spatial Clustering Algorithm for Extracting Attractive Local Regions in Georeferenced Documents

Tatsuhiro Sakai; Keiichi Tamura; Hajime Kitakami


IPSJ SIG Notes | 2007

Reducing Crossovers in Reconciliation Graphs with Extremal Optimization

Keiichi Tamura; Yasuma Mori; Hajime Kitakami


AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES | 2017

A Study on Aircraft Performance Model by using Cargo Flight Data

Keiichi Tamura; Akinori Harada; Yuki Higuchi; Haruki Matsuda; Yoshikazu Miyazawa


Research reports on information science and electrical engineering of Kyushu University | 2001

Speed-up of Parallel Spatial Join on Distributed Geographical Databases using Round Robin Partition

慶一 田村; Keiichi Tamura; 邦彦 金子; Kunihiko Kaneko; 顕文 牧之内; Akifumi Makinouchi


AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES | 2018

A Study on Arrival Control at Tokyo International Airport using Stochastic Model

Naoto Kitazume; Keiichi Tamura; Yoshikazu Miyazawa


AIAA Guidance, Navigation, and Control Conference | 2017

Optimal Arrival Time Assignment and Control Analysis using Air Traffic Data for Tokyo International Airport

Yuki Higuchi; Naoto Kitazume; Keiichi Tamura; Tomoyuki Kozuka; Yoshikazu Miyazawa; Mark Brown


AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES | 2017

A Study on Problem of the Efficiency Drop by the RADAR Vector at the Time of the Arrival Aircraft Congestion

Keiichi Tamura; Naoto Kitazume; Tomoyuki Kozuka; Yuki Higuchi; Yoshikazu Miyazawa


30th Congress of the International Council of the Aeronautical Sciences, ICAS 2016 | 2016

Efficient control of arrival time at a congested airport's terminal area

Yuki Higuchi; Naoto Kitazume; Tomoyuki Kozuka; Keiichi Tamura; Yoshikazu Miyazawa; Mark Brown


GSTF Journal on computing | 2013

Multiple Buffering for Parallel Approximate Sequence Matching using Disk-based Suffix Tree on Multi-core CPU

Yousuke Watanuki; Keiichi Tamura; Hajime Kitakami; Yoshifumi Takahashi

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Susumu Kuroki

Hiroshima City University

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Yoshikazu Miyazawa

National Aerospace Laboratory

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Kotaro Araki

Hiroshima City University

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Yasuma Mori

Hiroshima City University

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