Ichi TAKUMI


The Background Noise Estimation in the ELF Electromagnetic Wave Data Using Outer Product Expansion with Non-linear Filter
Akitoshi ITAI Hiroshi YASUKAWA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/11/01
Vol. E97-A  No. 11  pp. 2114-2120
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: 
Keyword: 
background noise reductiontensor product expansionelectromagnetic wavesignal processing
 Summary | Full Text:PDF(1.2MB)

Global Signal Elimination and Local Signals Enhancement from EM Radiation Waves Using Independent Component Analysis
Motoaki MOURI Arao FUNASE Andrzej CICHOCKI Ichi TAKUMI Hiroshi YASUKAWA Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/08/01
Vol. E91-A  No. 8  pp. 1875-1882
Type of Manuscript:  Special Section PAPER (Special Section on Signal Processing)
Category: 
Keyword: 
ICAelectromagnetic wavedenoisingsignals enhancementearthquake prediction
 Summary | Full Text:PDF(771.1KB)

Global Noise Estimation Based on Tensor Product Expansion with Absolute Error
Akitoshi ITAI Hiroshi YASUKAWA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/04/01
Vol. E90-A  No. 4  pp. 778-783
Type of Manuscript:  Special Section PAPER (Special Section on Selected Papers from the 19th Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
global noise reductiontensor product expansionabsolute errorelectromagnetic wavesignal processing
 Summary | Full Text:PDF(531.4KB)

Modified Algorithm on Maximum Detected Bit Flipping Decoding for High Dimensional Parity-Check Code
Yuuki FUNAHASHI Shogo USAMI Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/10/01
Vol. E89-A  No. 10  pp. 2670-2675
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
error correcting codehigh dimensional parity-check codehard-in decoding
 Summary | Full Text:PDF(669KB)

Iterative Decoding of High Dimensionality Parity Code
Toshio FUKUTA Yuuichi HAMASUNA Ichi TAKUMI Masayasu HATA Takahiro NAKANISHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/10/01
Vol. E86-A  No. 10  pp. 2473-2482
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
high dimensionality parity codeiterative decodingsteepest descent methodbit reliabilityquantization
 Summary | Full Text:PDF(754.3KB)

A Study on Precursor Signal Extraction with PCA for Predicting Significant Earthquakes
Shinji NIWA Hiroshi YASUKAWA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/08/01
Vol. E86-A  No. 8  pp. 2047-2052
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
signal extractionPCAelectromagnetic waveELF bandearthquake
 Summary | Full Text:PDF(301.3KB)

Signal Processing and Sonification of Seismic Electromagnetic Radiation in the ELF Band
Seiji ADACHI Hiroshi YASUKAWA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/04/01
Vol. E84-A  No. 4  pp. 1011-1016
Type of Manuscript:  Special Section PAPER (Special Section on Acoustic Signal Processing)
Category: 
Keyword: 
electromagnetic radiationearthquakeELF band
 Summary | Full Text:PDF(2MB)

Hardware Implementation of the High-Dimensional Discrete Torus Knot Code
Yuuichi HAMASUNA Masanori YAMAMURA Toshio ISHIZAKA Masaaki MATSUO Masayasu HATA Ichi TAKUMI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/04/01
Vol. E84-A  No. 4  pp. 949-956
Type of Manuscript:  Special Section PAPER (Special Section on Fundamentals of Information and Communications)
Category: 
Keyword: 
robust and high speed error correctionburst errorwired logic and parallel operationASIC
 Summary | Full Text:PDF(1.4MB)

Realization of Quantum Receiver for M-Ary Signals
Yuji FUJIHARA Shigeru TATSUTA Tsuyoshi Sasaki USUDA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/04/01
Vol. E84-A  No. 4  pp. 906-912
Type of Manuscript:  Special Section PAPER (Special Section on Fundamentals of Information and Communications)
Category: 
Keyword: 
quantum communication theoryquantum detectionquantum receiverrealization problemerror probability
 Summary | Full Text:PDF(291.4KB)

A Simplification Algorithm for Calculation of the Mutual Information by Quantum Combined Measurement
Shogo USAMI Tsuyoshi Sasaki USUDA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/10/25
Vol. E82-A  No. 10  pp. 2185-2190
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Quantum Information
Keyword: 
quantum information theorychannel capacitysquare-root measurementmutual informationsuperadditivity
 Summary | Full Text:PDF(655.4KB)

Application of Quantum Cryptography to an Eavesdropping Detectable Data Transmission
Takamitsu KUDO Tsuyoshi Sasaki USUDA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/10/25
Vol. E82-A  No. 10  pp. 2178-2184
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Quantum Information
Keyword: 
quantum cryptographycommunication basesdetection of eavesdropping
 Summary | Full Text:PDF(550KB)

Performance Improvement of Variable Stepsize NLMS
Jirasak TANPREEYACHAYA Ichi TAKUMI Masayasu HATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/08/25
Vol. E78-A  No. 8  pp. 905-914
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
adaptive FIR filterNLMSconvergence characteristicsvariable stepsizenoise estimation
 Summary | Full Text:PDF(845.3KB)