Takafumi Hayashi

77 papers B 3C 10Misc 1Journal 43Unranked 20
YearRankTypeTitle / Venue / Authors
2021 J jnl
Small-Cell Assisted Group Paging for Massive MTC in LTE Networks: Design and Analysis.
IEEE Access
Anh-Tuan H. Bui, Chuyen T. Nguyen, Takafumi Hayashi, Anh T. Pham
2020 J jnl
Design of Compact Matched Filter Banks of Polyphase ZCZ Codes.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Sho Kuroda, Shinya Matsufuji, Takahiro Matsumoto, Yuta Ida, Takafumi Hayashi
2019 J jnl
Artificial-Noise-Aided Precoding Design for Multi-User Visible Light Communication Channels.
IEEE Access
Thanh V. Pham, Takafumi Hayashi, Anh T. Pham
2018 J jnl
A Novel Class of Structured Zero-Correlation Zone Sequence Sets.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Takao Maeda, Anh T. Pham, Shinya Matsufuji
2018 C conf
A Novel Construction of Quadtree-structured Zero-correlation Zone Sequence Sets.
ISITA
Takafumi Hayashi, Yoshinobu Tanno, Anh T. Pham, Shinya Matsufuji, Kensaku Kawauchi, Takao Maeda
2018 — conf
Artificial-Noise-Aided Precoding Design for Multi-User Visible Light Communication Channels.
ICC Workshops
Thanh V. Pham, Takafumi Hayashi, Anh T. Pham
2018 J jnl
Dictionary learning with the \({{\ell }_{1/2}}\) -regularizer and the coherence penalty and its convergence analysis.
Int. J. Mach. Learn. Cybern.
Zhenni Li, Takafumi Hayashi, Shuxue Ding, Yujie Li
2018 — conf
WiSMA: strategy management architecture for wireless resource optimization.
ISPACS
Tomoki Murakami, Toshiro Nakahira, Hirantha Abeysekera, Koichi Ishihara, Takafumi Hayashi, Hiroyuki Nakamura
2017 J jnl
A Novel Class of Quadriphase Zero-Correlation Zone Sequence Sets.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Yodai Watanabe, Toshiaki Miyazaki, Anh T. Pham, Takao Maeda, Shinya Matsufuji
2017 J jnl
A Novel Construction of Tree-Structured Zero-Correlation Zone Sequence Sets.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Yodai Watanabe, Takao Maeda, Shinya Matsufuji
2017 J jnl
Analysis dictionary learning using block coordinate descent framework with proximal operators.
Neurocomputing
Zhenni Li, Shuxue Ding, Takafumi Hayashi, Yujie Li
2017 J jnl
Incoherent dictionary learning with log-regularizer based on proximal operators.
Digit. Signal Process.
Zhenni Li, Shuxue Ding, Takafumi Hayashi, Yujie Li
2016 B conf
An efficient algorithm for incoherent analysis dictionary learning based on proximal operator.
SMC
Zhenni Li, Takafumi Hayashi, Shuxue Ding, Xiang Li
2015 J jnl
A Novel Class of Zero-Correlation Zone Sequence Set Having a Low Peak-Factor and a Flat Power Spectrum.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Yodai Watanabe, Anh T. Pham, Toshiaki Miyazaki, Shinya Matsufuji, Takao Maeda
2015 — conf
A novel class of QPSK zero-correlation zone sequence sets.
IWSDA
Takafumi Hayashi, Yodai Watanabe, Anh T. Pham, Toshiaki Miyazaki, Shinya Matsufuji, Takao Maeda
2015 — conf
An efficient algorithm for dictionary learning with a mixed-norm regularizer for sparsity based on proximal operator.
ICSPCS
Zhenni Li, Shuxue Ding, Takafumi Hayashi, Wuhui Chen, Yujie Li
2015 — conf
An optimal partial transmit sequence combination method for peak-to-average power ratio reduction in SC-FDMA system.
IWSDA
Meng-Chun Wu, Takafumi Hayashi
2015 — conf
On bent ZCZ codes.
IWSDA
Shinya Matsufuji, Takafumi Hayashi, Sho Kuroda, Yuta Ida, Takahiro Matsumoto
2015 — conf
On-demand Customizable Wireless Sensor Network.
ANT/SEIT
Toshiaki Miyazaki, Peng Li, Song Guo, Junji Kitamichi, Takafumi Hayashi, Tsuneo Tsukahara
2015 J jnl
Parameterization of High-Dimensional Perfect Sequences over a Composition Algebra over R.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takao Maeda, Yodai Watanabe, Takafumi Hayashi
2015 — conf
Security analysis of audio secret sharing scheme encrypting audio secrets.
iCAST
Keisuke Tamoi, Takafumi Hayashi, Yodai Watanabe
2015 — conf
Sum-rate maximization of multi-user MIMO visible light communications.
ICC Workshops
Thanh V. Pham, Hoa Le Minh, Zabih Ghassemlooy, Takafumi Hayashi, Anh T. Pham
2014 C conf
A novel class of binary zero-correlation zone sequence sets by using a cyclic difference set.
ISITA
Takafumi Hayashi, Yodai Watanabe, Takao Maeda
2014 C conf
A novel zero-correlation zone sequence set having a low-peak factor and a flat power spectrum.
ISITA
Takafumi Hayashi, Yodai Watanabe, Shinya Matsufuji, Takao Maeda
2014 Misc conf
A software defined wireless sensor network.
ICNC
Toshiaki Miyazaki, Shoichi Yamaguchi, Koji Kobayashi, Junji Kitamichi, Song Guo, Tsuneo Tsukahara, Takafumi Hayashi
2014 — conf
DASN: demand-addressable sensor network for active information acquisition.
ICUIMC
Toshiaki Miyazaki, Hiroki Iwata, Koji Kobayashi, Shoichi Yamaguchi, Deze Zeng, Song Guo, Junji Kitamichi, Takafumi Hayashi, Tsuneo Tsukahara
2014 J jnl
Low-Peak-Factor Pseudo-White-Noise Sequence Set with Optimal Zero-Correlation Zone.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Takao Maeda, Shigeru Kanemoto, Shinya Matsufuji
2014 C conf
Parameterization of high-dimensional perfect sequences over a composition algebra over ℝ.
ISITA
Takao Maeda, Takafumi Hayashi
2014 — conf
Social network based smart grids analysis.
ISIC
Joseph C. Tsai, Neil Y. Yen, Takafumi Hayashi
2013 C conf
A novel network-centric infrastructure for social networking services using a messaging network.
APNOMS
Takafumi Hayashi, Hideyuki Fukuhara, Yasuhiro Abe, Masayuki Hisada, Jiro Yamazaki, Hajime Tokura, Toshiaki Miyazaki, Jiro Iwase
2013 — conf
Evolution of Software-Defined Sensor Networks.
MSN
Deze Zeng, Toshiaki Miyazaki, Song Guo, Tsuneo Tsukahara, Junji Kitamichi, Takafumi Hayashi
2013 J jnl
Fourier Analysis of Sequences over a Composition Algebra of the Real Number Field.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takao Maeda, Takafumi Hayashi
2013 — conf
Low-peak factor optimal zero-correlation zone sequence set and its applications.
IWSDA
Takafumi Hayashi, Takao Maeda, Shigeru Kanemoto, Shinya Matsufuji
2013 — conf
Programmable wireless sensor node featuring low-power FPGA and microcontroller.
iCAST/UMEDIA
Shoichi Yamaguchi, Toshiaki Miyazaki, Junji Kitamichi, Song Guo, Tsuneo Tsukahara, Takafumi Hayashi
2012 J jnl
A Generalized Construction Scheme of a Zero-Correlation Zone Sequence Set with a Wide Inter-Subset Zero-Correlation Zone.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Takao Maeda, Shinya Matsufuji
2012 — conf
Coping with the Complexity of SOA Systems with Message Forensics.
AINA Workshops
Takafumi Hayashi, Atsushi Kara, Toshiaki Miyazaki, Jiro Iwase, Hideyuki Fukuhara, Tetsu Saburi, Masayuki Hisada
2012 C conf
Fourier analysis of sequences over a composition algebra of the real number field.
ISITA
Takao Maeda, Takafumi Hayashi
2012 J jnl
Parameterization of Perfect Sequences over a Composition Algebra.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takao Maeda, Takafumi Hayashi
2011 J jnl
A Generalized Construction of Zero-Correlation Zone Sequence Set with Sequence Subsets.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Takao Maeda, Satoshi Okawa
2011 J jnl
A Ternary Zero-Correlation Zone Sequence Set Having Wide Inter-Subset Zero-Correlation Zone.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Takao Maeda, Shinya Matsufuji, Satoshi Okawa
2011 — conf
A novel construction of zero-correlation zone sequence set with wide inter-subset zero-correlation zone.
IWSDA
Takafumi Hayashi, Takao Maeda, Shigeru Kanemoto, Shinya Matsufuji
2011 J jnl
Parameterization of Perfect Arrays of Real Numbers.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takao Maeda, Takafumi Hayashi
2011 J jnl
Parameterization of Perfect Sequences of Real Numbers.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takao Maeda, Takafumi Hayashi
2011 C conf
Pulse compression for radar using zero-correlation zone sequence sets.
IGARSS
Takao Maeda, Shigeru Kanemoto, Takafumi Hayashi
2010 J jnl
A Generalized Construction of Optimal Zero-Correlation Zone Sequence Set from a Perfect Sequence Pair.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Shinya Matsufuji
2010 — conf
Event Capture Approaches for Vulnerability Detection.
Security and Management
Raymond Wu, Masayuki Hisada, Atsushi Kara, Takafumi Hayashi
2010 — conf
Metadata Driven Approaches for Web Security of New age Computing.
International Conference on Internet Computing
Raymond Wu, Masayuki Hisada, Atsushi Kara, Takafumi Hayashi
2010 J jnl
On a ZCZ Code Including a Sequence Used for a Synchronization Symbol.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Shinya Matsufuji, Takahiro Matsumoto, Tomohiro Hayashida, Takafumi Hayashi, Noriyoshi Kuroyanagi, Pingzhi Fan
2010 B conf
Service oriented architecture realized by a messaging network.
NOMS
Junya Terazono, Hideyuki Fukuhara, Isamu Koseda, Ryutaroh Fujita, Toshiaki Miyazaki, Senro Saito, Takafumi Hayashi
2009 J jnl
A Class of Zero-Correlation Zone Sequence Set Using a Perfect Sequence.
IEEE Signal Process. Lett.
Takafumi Hayashi
2008 J jnl
A Novel Class of Zero-Correlation Zone Sequence Sets Constructed from a Perfect Sequence.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2008 J jnl
Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence and a Complementary Sequence Pair.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2007 C conf
A Messaging Network to Realize an SOA-Based System.
CIT
Takafumi Hayashi, Hideyuki Fukuhara, Ryutaroh Fujita, Toshiaki Miyazaki, Senro Saito
2007 J jnl
An Integrated Sequence Construction of Binary Zero-Correlation Zone Sequences.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2007 C conf
Optimal Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence.
CIT
Takafumi Hayashi
2007 C conf
Recognition Algorithm for Topographic Features.
CIT
Naoto Harada, Takafumi Hayashi, Naru Hirata, Hirohide Demura, Noriaki Asada
2007 J jnl
Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2007 J jnl
Zero-Correlation Zone Sequence Set Construction Using an Even-Perfect Sequence and an Odd-Perfect Sequence.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2006 J jnl
A Class of Two-Dimensional Signal Having a Flat Power Spectrum and a Low Peak Factor.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2006 J jnl
Binary Zero-Correlation Zone Sequence Set Constructed from an M-Sequence.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2006 J jnl
Binary Zero-Correlation Zone Sequence Set Construction Using a Cyclic Hadamard Sequence.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2006 J jnl
On Optimal Construction of Two Classes of ZCZ Codes.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Shinya Matsufuji
2006 J jnl
Ternary Sequence Set Having Periodic and Aperiodic Zero-Correlation Zone.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2005 J jnl
Binary Zero-Correlation Zone Sequence Set Construction Using a Primitive Linear Recursion.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2005 J jnl
Upper Bounds of the Correlation Functions of a Class of Binary Zero-Correlation-Zone Sequences.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi, Takao Maeda, Satoshi Okawa
2004 J jnl
A Generalization of Binary Zero-Correlation Zone Sequence Sets Constructed from Hadamard Matrices.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2004 J jnl
Binary array set having a cross-shaped zero-correlation zone.
IEEE Signal Process. Lett.
Takafumi Hayashi, S. Okawa
2004 J jnl
Low-peak pseudo-white-noise arrays.
IEEE Signal Process. Lett.
Takafumi Hayashi, S. Okawa
2004 J jnl
Synthesis of two-dimensional pseudo white-noise signal with low peak factor.
IEEE Signal Process. Lett.
Takafumi Hayashi
2003 J jnl
A Class of Ternary Sequence Sets with a Zero-Correlation Zone for Periodic, Aperiodic, and Odd Correlation Functions.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2003 — conf
Limits of the Correlation Function of a Class of Binary Zero-correlation-zone Sequences.
SIP
Takafumi Hayashi
2003 J jnl
Ternary Array Set Having a Zero-Correlation Zone.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2002 J jnl
A class of two-dimensional binary sequences with zero-correlation zone.
IEEE Signal Process. Lett.
Takafumi Hayashi
2002 J jnl
Binary Sequences with Orthogonal Subsequences and a Zero-Correlation Zone: Pair-Preserving Shuffled Sequences.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takafumi Hayashi
2002 J jnl
Speech Recognition Using Acoustic Similarity-Based Primitives.
Syst. Comput. Jpn.
Takafumi Hayashi, Hiroki Mori, Motoyuki Suzuki, Shozo Makino, Hirotomo Aso
1999 B conf
An Automatic Acquisition of Acoustical Units for Speech Recognition Based on Hidden Markov Network.
Discovery Science
Motoyuki Suzuki, Takafumi Hayashi, Hiroki Mori, Shozo Makino, Hirotomo Aso
1995 — conf
A diffusion model for computer animation of diffuse ink painting.
CA
Tosiyasu L. Kunii, Gleb V. Nosovskij, Takafumi Hayashi