IEICE Trans

Tomoharu SHIBUYA

Improvement of the Quality of Visual Secret Sharing Schemes with Constraints on the Usage of Shares Mariko FUJII Tomoharu SHIBUYA
Publication: Publication Date: 2020/01/01 Vol. E103-D No. 1 pp. 11-24 Type of Manuscript: Special Section PAPER (Special Section on Enriched Multimedia — Application of Multimedia Technology and Its Security —) Category: Keyword: secret sharing, visual cryptography, threshold visual secret sharing schemes, halftone image, Laplacian filter,
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On a Characterization of a State of Rank-Modulation Scheme Over Multi-Cell Ranking by a Group Action Tomoharu SHIBUYA Takeru SUDO
Publication: Publication Date: 2017/12/01 Vol. E100-A No. 12 pp. 2558-2571 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory and Techniques Keyword: rank-modulation, coding for flash memories, multi-cell ranking, permutation matrices, group action,
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Single Error Correcting Quantum Codes for the Amplitude Damping Channel Based on Classical Codes over GF(7) Keisuke KODAIRA Mihoko WADA Tomoharu SHIBUYA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2014/11/01 Vol. E97-A No. 11 pp. 2247-2253 Type of Manuscript: PAPER Category: Coding Theory Keyword: amplitude damping, quantum error correcting code, asymmetric channel,
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Efficient Linear Time Encoding for LDPC Codes Tomoharu SHIBUYA Kazuki KOBAYASHI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2014/07/01 Vol. E97-A No. 7 pp. 1556-1567 Type of Manuscript: PAPER Category: Coding Theory Keyword: LDPC codes, encoding of linear codes, block triangular matrices, a system of linear equations,
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On the Dependence of Error Performance of Spatially Coupled LDPC Codes on Their Design Parameters Hiroyuki IHARA Tomoharu SHIBUYA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2013/12/01 Vol. E96-A No. 12 pp. 2447-2451 Type of Manuscript: Special Section LETTER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: spatially coupled LDPC codes, density evolution, BP threshold, MAP threshold,
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Ring Theoretic Approach to Reversible Codes Based on Circulant Matrices Tomoharu SHIBUYA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2011/11/01 Vol. E94-A No. 11 pp. 2121-2126 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: LDPC codes, reversible codes, encoding of linear codes, Jacobi method, circulant matrices, message-passing algorithm,
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Characterization of Factor Graph by Mooij's Sufficient Condition for Convergence of the Sum-Product Algorithm Tomoharu SHIBUYA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2010/11/01 Vol. E93-A No. 11 pp. 2083-2088 Type of Manuscript: Special Section LETTER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: convergence of the sum-product algorithm, factor graph, message-passing, sum-product decoding, LDPC codes,
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Detailed Evolution of Degree Distributions in Residual Graphs with Joint Degree Distributions Takayuki NOZAKI Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2008/10/01 Vol. E91-A No. 10 pp. 2737-2744 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: detailedly represented irregular LDPC code ensembles, evolution of degree distributions in residual graphs, peeling algorithm, binary erasure channel,
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Average Bit Erasure Probability of Regular LDPC Code Ensembles under MAP Decoding over BEC Takayuki ITSUI Kenta KASAI Ryoji IKEGAYA Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2007/09/01 Vol. E90-A No. 9 pp. 1763-1771 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Keyword: regular LDPC code ensemble, a-posteriori probability decoding, binary erasure channel, EXIT function, shortened information function, support weight distribution,
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Performance of Standard Irregular LDPC Codes under Maximum Likelihood Decoding Ryoji IKEGAYA Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2007/07/01 Vol. E90-A No. 7 pp. 1432-1443 Type of Manuscript: PAPER Category: Coding Theory Keyword: low-density parity-check (LDPC) code, maximum-likelihood decoding, standard irregular LDPC code ensemble, block error probability,
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Design of Irregular Repeat Accumulate Codes with Joint Degree Distributions Kenta KASAI Shinya MIYAMOTO Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2006/11/01 Vol. E89-A No. 11 pp. 3351-3354 Type of Manuscript: LETTER Category: Coding Theory Keyword: irregular repeat accumulate codes, joint degree distribution, iterative decoding, density evolution, belief propagation,
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Average Coset Weight Distribution of Multi-Edge Type LDPC Code Ensembles Kenta KASAI Yuji SHIMOYAMA Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2006/10/01 Vol. E89-A No. 10 pp. 2519-2525 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: average coset weight distribution, low-density parity-check codes, multi-edge type low-density parity-check codes, symmetry, weight distribution,
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Weight and Stopping Set Distributions of Two-Edge Type LDPC Code Ensembles Ryoji IKEGAYA Kenta KASAI Yuji SHIMOYAMA Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/10/01 Vol. E88-A No. 10 pp. 2745-2761 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: two-edge type LDPC code, weight distribution, stopping set distribution, belief propagation, error performance,
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Iterative Decoding Based on the Concave-Convex Procedure Tomoharu SHIBUYA Ken HARADA Ryosuke TOHYAMA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/05/01 Vol. E88-A No. 5 pp. 1346-1364 Type of Manuscript: PAPER Category: Coding Theory Keyword: concave-convex procedure, iterative decoding, Bethe free energy, LDPC codes, belief propagation,
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Asymptotic Weight and Stopping Set Distributions for Detailedly Represented Irregular LDPC Code Ensembles Ryoji IKEGAYA Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2004/10/01 Vol. E87-A No. 10 pp. 2484-2492 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: weight distribution, stopping set distribution, detailedly represented irregular LDPC code ensemble,
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Detailedly Represented Irregular Low-Density Parity-Check Codes Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/10/01 Vol. E86-A No. 10 pp. 2435-2444 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: density evolution, irregular low-density parity-check codes, low-density parity-check codes, belief propagation,
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On Tanner's Lower Bound for the Minimum Distance of Regular LDPC Codes Based on Combinatorial Designs Tomoharu SHIBUYA Masatoshi ONIKUBO Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/10/01 Vol. E86-A No. 10 pp. 2428-2434 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: LDPC codes, the minimum distance Tanner graph, t-design, Steiner system,
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Performance of a Decoding Algorithm for LDPC Codes Based on the Concave-Convex Procedure Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/10/01 Vol. E86-A No. 10 pp. 2601-2606 Type of Manuscript: Special Section LETTER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: LDPC codes, iterative decoding, belief propagation, concave-convex procedure, Bethe free energy,
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Construction of Cyclic Codes Suitable for Iterative Decoding via Generating Idempotents Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/04/01 Vol. E86-A No. 4 pp. 928-939 Type of Manuscript: PAPER Category: Coding Theory Keyword: Tanner graphs, cyclic codes, LDPC codes, sum-product algorithm, iterative decoding,
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A Note on a Lower Bound for Generalized Hamming Weights Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/12/01 Vol. E84-A No. 12 pp. 3138-3145 Type of Manuscript: PAPER Category: Coding Theory Keyword: generalized Hamming weight, well-behaving, cyclic codes, generalized Griesmer bound, BCH bound,
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A Dual of Well-Behaving Type Designed Minimum Distance Tomoharu SHIBUYA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/02/01 Vol. E84-A No. 2 pp. 647-652 Type of Manuscript: PAPER Category: Coding Theory Keyword: designed minimum distance, Feng-Rao bound, order bound, generalized Hamming weight, algebraic geometry codes,
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A Lower Bound for Generalized Hamming Weights and a Condition for t-th Rank MDS Tomoharu SHIBUYA Ryo HASEGAWA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1999/06/25 Vol. E82-A No. 6 pp. 1090-1101 Type of Manuscript: PAPER Category: Information Theory and Coding Theory Keyword: generalized Hamming weights, t-th rank MDS, Reed-Solomon codes, Reed-Muller codes, codes on affine algebraic variety, AG codes on C_ab,
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On Generalized Hamming Weights of Codes Constructed on Affine Algebraic Varieties Tomoharu SHIBUYA Jiro MIZUTANI Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1998/10/25 Vol. E81-A No. 10 pp. 1979-1989 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: generalized Hamming weights, codes on affine algebraic varieties, codes on C_ab, Grobner basis, monomial order,
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Simple Estimation for the Dimension of Subfield Subcodes of AG Codes Tomoharu SHIBUYA Ryutaroh MATSUMOTO Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1997/11/25 Vol. E80-A No. 11 pp. 2058-2065 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Coding Theory Keyword: algebraic geometric code, dimension of subfield subcode, class of algebraic curve C_ab,
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An Improved Bound for the Dimension of Subfield Subcodes Tomoharu SHIBUYA Ryutaroh MATSUMOTO Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1997/05/25 Vol. E80-A No. 5 pp. 876-880 Type of Manuscript: PAPER Category: Information Theory and Coding Theory Keyword: dimension of subfield subcode, BCH code, algebraic geometric code,
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On the Performance of Algebraic Geometric Codes Tomoharu SHIBUYA Hajime JINUSHI Shinji MIURA Kohichi SAKANIWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1996/06/25 Vol. E79-A No. 6 pp. 928-937 Type of Manuscript: PAPER Category: Information Theory and Coding Theory Keyword: algebraic geometric code, class of algebraic curve C_ab, Feng-Rao designed distance, BCH code, BCH bound,
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