Tadashi ARARAGI


A Distributed and Cooperative NameNode Cluster for a Highly-Available Hadoop Distributed File System
Yonghwan KIM Tadashi ARARAGI Junya NAKAMURA Toshimitsu MASUZAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2015/04/01
Vol. E98-D  No. 4  pp. 835-851
Type of Manuscript:  PAPER
Category: Computer System
Keyword: 
HadoopHDFShigh-availabilitydistributed NameNodesautomatic failoverload balancing
 Summary | Full Text:PDF(1.4MB)

Efficient Randomized Byzantine Fault-Tolerant Replication Based on Special Valued Coin Tossing
Junya NAKAMURA Tadashi ARARAGI Shigeru MASUYAMA Toshimitsu MASUZAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2014/02/01
Vol. E97-D  No. 2  pp. 231-244
Type of Manuscript:  PAPER
Category: Dependable Computing
Keyword: 
Byzantine fault tolerancestate machine replicationByzantine agreementconsensusasynchronous distributed system
 Summary | Full Text:PDF(1.4MB)

A Method of Parallelizing Consensuses for Accelerating Byzantine Fault Tolerance
Junya NAKAMURA Tadashi ARARAGI Toshimitsu MASUZAWA Shigeru MASUYAMA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2014/01/01
Vol. E97-D  No. 1  pp. 53-64
Type of Manuscript:  PAPER
Category: Dependable Computing
Keyword: 
Byzantine fault toleranceasynchronous distributed systemagreementconsensusstate machine replication
 Summary | Full Text:PDF(993.4KB)

A Concurrent Partial Snapshot Algorithm for Large-Scale and Dynamic Distributed Systems
Yonghwan KIM Tadashi ARARAGI Junya NAKAMURA Toshimitsu MASUZAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2014/01/01
Vol. E97-D  No. 1  pp. 65-76
Type of Manuscript:  PAPER
Category: Dependable Computing
Keyword: 
fault-tolerancelarge-scale distributed systemconcurrent snapshotcheckpointrollback
 Summary | Full Text:PDF(1.6MB)

Formulation of Mobile Agent Allocation and Its Strong NP-Completeness
Atsushi SASAKI Tadashi ARARAGI Shigeru MASUYAMA Keizo MIYATA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2005/05/01
Vol. E88-D  No. 5  pp. 1060-1063
Type of Manuscript:  LETTER
Category: Complexity Theory
Keyword: 
strong NP-completenessmobile agentscommunication costsubgraph isomorphismload balancing
 Summary | Full Text:PDF(123KB)