Takafumi Hayashi

According to our database, Takafumi Hayashi authored at least 75 papers between 1995 and 2021.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2021

Small-Cell Assisted Group Paging for Massive MTC in LTE Networks: Design and Analysis.

Anh-Tuan H. Bui, Chuyen T. Nguyen, Takafumi Hayashi, Anh T. Pham

IEEE Access, 2021

2020

Design of Compact Matched Filter Banks of Polyphase ZCZ Codes.

Sho Kuroda, Shinya Matsufuji, Takahiro Matsumoto, Yuta Ida, Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020

2019

Artificial-Noise-Aided Precoding Design for Multi-User Visible Light Communication Channels.

Thanh V. Pham, Takafumi Hayashi, Anh T. Pham

IEEE Access, 2019

2018

Dictionary learning with the \({{\ell }_{1/2}}\) -regularizer and the coherence penalty and its convergence analysis.

Zhenni Li, Takafumi Hayashi, Shuxue Ding, Yujie Li

Int. J. Mach. Learn. Cybern., 2018

A Novel Class of Structured Zero-Correlation Zone Sequence Sets.

Takafumi Hayashi, Takao Maeda, Anh T. Pham, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018

WiSMA: strategy management architecture for wireless resource optimization.

Tomoki Murakami, Toshiro Nakahira, Hirantha Abeysekera, Koichi Ishihara, Takafumi Hayashi, Hiroyuki Nakamura

Proceedings of the 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 2018

A Novel Construction of Quadtree-structured Zero-correlation Zone Sequence Sets.

Takafumi Hayashi, Yoshinobu Tanno, Anh T. Pham, Shinya Matsufuji, Kensaku Kawauchi, Takao Maeda

Proceedings of the International Symposium on Information Theory and Its Applications, 2018

2017

Analysis dictionary learning using block coordinate descent framework with proximal operators.

Zhenni Li, Shuxue Ding, Takafumi Hayashi, Yujie Li

Neurocomputing, 2017

A Novel Class of Quadriphase Zero-Correlation Zone Sequence Sets.

Takafumi Hayashi, Yodai Watanabe, Toshiaki Miyazaki, Anh T. Pham, Takao Maeda, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017

A Novel Construction of Tree-Structured Zero-Correlation Zone Sequence Sets.

Takafumi Hayashi, Yodai Watanabe, Takao Maeda, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017

Incoherent dictionary learning with log-regularizer based on proximal operators.

Zhenni Li, Shuxue Ding, Takafumi Hayashi, Yujie Li

Digit. Signal Process., 2017

2016

An efficient algorithm for incoherent analysis dictionary learning based on proximal operator.

Zhenni Li, Takafumi Hayashi, Shuxue Ding, Xiang Li

Proceedings of the 2016 IEEE International Conference on Systems, Man, and Cybernetics, 2016

2015

Parameterization of High-Dimensional Perfect Sequences over a Composition Algebra over R.

Takao Maeda, Yodai Watanabe, Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015

A Novel Class of Zero-Correlation Zone Sequence Set Having a Low Peak-Factor and a Flat Power Spectrum.

Takafumi Hayashi, Yodai Watanabe, Anh T. Pham, Toshiaki Miyazaki, Shinya Matsufuji, Takao Maeda

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015

An optimal partial transmit sequence combination method for peak-to-average power ratio reduction in SC-FDMA system.

Meng-Chun Wu, Takafumi Hayashi

Proceedings of the Seventh International Workshop on Signal Design and its Applications in Communications, 2015

On bent ZCZ codes.

Shinya Matsufuji, Takafumi Hayashi, Sho Kuroda, Yuta Ida, Takahiro Matsumoto

Proceedings of the Seventh International Workshop on Signal Design and its Applications in Communications, 2015

A novel class of QPSK zero-correlation zone sequence sets.

Takafumi Hayashi, Yodai Watanabe, Anh T. Pham, Toshiaki Miyazaki, Shinya Matsufuji, Takao Maeda

Proceedings of the Seventh International Workshop on Signal Design and its Applications in Communications, 2015

An efficient algorithm for dictionary learning with a mixed-norm regularizer for sparsity based on proximal operator.

Zhenni Li, Shuxue Ding, Takafumi Hayashi, Wuhui Chen, Yujie Li

Proceedings of the 9th International Conference on Signal Processing and Communication Systems, 2015

Sum-rate maximization of multi-user MIMO visible light communications.

Thanh V. Pham, Hoa Le Minh, Zabih Ghassemlooy, Takafumi Hayashi, Anh T. Pham

Proceedings of the IEEE International Conference on Communication, 2015

Security analysis of audio secret sharing scheme encrypting audio secrets.

Keisuke Tamoi, Takafumi Hayashi, Yodai Watanabe

Proceedings of the IEEE 7th International Conference on Awareness Science and Technology, 2015

On-demand Customizable Wireless Sensor Network.

Toshiaki Miyazaki, Peng Li, Song Guo, Junji Kitamichi, Takafumi Hayashi, Tsuneo Tsukahara

Proceedings of the 6th International Conference on Ambient Systems, 2015

2014

Low-Peak-Factor Pseudo-White-Noise Sequence Set with Optimal Zero-Correlation Zone.

Takafumi Hayashi, Takao Maeda, Shigeru Kanemoto, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014

Parameterization of high-dimensional perfect sequences over a composition algebra over ℝ.

Takao Maeda, Takafumi Hayashi

Proceedings of the International Symposium on Information Theory and its Applications, 2014

A novel zero-correlation zone sequence set having a low-peak factor and a flat power spectrum.

Takafumi Hayashi, Yodai Watanabe, Shinya Matsufuji, Takao Maeda

Proceedings of the International Symposium on Information Theory and its Applications, 2014

A novel class of binary zero-correlation zone sequence sets by using a cyclic difference set.

Takafumi Hayashi, Yodai Watanabe, Takao Maeda

Proceedings of the International Symposium on Information Theory and its Applications, 2014

Social network based smart grids analysis.

Joseph C. Tsai, Neil Y. Yen, Takafumi Hayashi

Proceedings of the 2014 IEEE International Symposium on Independent Computing, 2014

DASN: demand-addressable sensor network for active information acquisition.

Toshiaki Miyazaki, Hiroki Iwata, Koji Kobayashi, Shoichi Yamaguchi, Deze Zeng, Song Guo, Junji Kitamichi, Takafumi Hayashi, Tsuneo Tsukahara

Proceedings of the 8th International Conference on Ubiquitous Information Management and Communication, 2014

A software defined wireless sensor network.

Toshiaki Miyazaki, Shoichi Yamaguchi, Koji Kobayashi, Junji Kitamichi, Song Guo, Tsuneo Tsukahara, Takafumi Hayashi

Proceedings of the International Conference on Computing, Networking and Communications, 2014

2013

Fourier Analysis of Sequences over a Composition Algebra of the Real Number Field.

Takao Maeda, Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013

Evolution of Software-Defined Sensor Networks.

Deze Zeng, Toshiaki Miyazaki, Song Guo, Tsuneo Tsukahara, Junji Kitamichi, Takafumi Hayashi

Proceedings of the IEEE 9th International Conference on Mobile Ad-hoc and Sensor Networks, 2013

Low-peak factor optimal zero-correlation zone sequence set and its applications.

Takafumi Hayashi, Takao Maeda, Shigeru Kanemoto, Shinya Matsufuji

Proceedings of the Sixth International Workshop on Signal Design and Its Applications in Communications, 2013

Programmable wireless sensor node featuring low-power FPGA and microcontroller.

Shoichi Yamaguchi, Toshiaki Miyazaki, Junji Kitamichi, Song Guo, Tsuneo Tsukahara, Takafumi Hayashi

Proceedings of the International Joint Conference on Awareness Science and Technology & Ubi-Media Computing, 2013

A novel network-centric infrastructure for social networking services using a messaging network.

Takafumi Hayashi, Hideyuki Fukuhara, Yasuhiro Abe, Masayuki Hisada, Jiro Yamazaki, Hajime Tokura, Toshiaki Miyazaki, Jiro Iwase

Proceedings of the 15th Asia-Pacific Network Operations and Management Symposium, 2013

2012

Parameterization of Perfect Sequences over a Composition Algebra.

Takao Maeda, Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012

A Generalized Construction Scheme of a Zero-Correlation Zone Sequence Set with a Wide Inter-Subset Zero-Correlation Zone.

Takafumi Hayashi, Takao Maeda, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012

Coping with the Complexity of SOA Systems with Message Forensics.

Takafumi Hayashi, Atsushi Kara, Toshiaki Miyazaki, Jiro Iwase, Hideyuki Fukuhara, Tetsu Saburi, Masayuki Hisada

Proceedings of the 26th International Conference on Advanced Information Networking and Applications Workshops, 2012

2011

Parameterization of Perfect Arrays of Real Numbers.

Takao Maeda, Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011

Parameterization of Perfect Sequences of Real Numbers.

Takao Maeda, Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011

A Generalized Construction of Zero-Correlation Zone Sequence Set with Sequence Subsets.

Takafumi Hayashi, Takao Maeda, Satoshi Okawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011

A Ternary Zero-Correlation Zone Sequence Set Having Wide Inter-Subset Zero-Correlation Zone.

Takafumi Hayashi, Takao Maeda, Shinya Matsufuji, Satoshi Okawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011

A novel construction of zero-correlation zone sequence set with wide inter-subset zero-correlation zone.

Takafumi Hayashi, Takao Maeda, Shigeru Kanemoto, Shinya Matsufuji

Proceedings of the Fifth International Workshop on Signal Design and its Applications in Communications, 2011

Pulse compression for radar using zero-correlation zone sequence sets.

Takao Maeda, Shigeru Kanemoto, Takafumi Hayashi

Proceedings of the 2011 IEEE International Geoscience and Remote Sensing Symposium, 2011

2010

On a ZCZ Code Including a Sequence Used for a Synchronization Symbol.

Shinya Matsufuji, Takahiro Matsumoto, Tomohiro Hayashida, Takafumi Hayashi, Noriyoshi Kuroyanagi, Pingzhi Fan

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010

A Generalized Construction of Optimal Zero-Correlation Zone Sequence Set from a Perfect Sequence Pair.

Takafumi Hayashi, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010

Service oriented architecture realized by a messaging network.

Junya Terazono, Hideyuki Fukuhara, Isamu Koseda, Ryutaroh Fujita, Toshiaki Miyazaki, Senro Saito, Takafumi Hayashi

Proceedings of the IEEE/IFIP Network Operations and Management Symposium, 2010

Metadata Driven Approaches for Web Security of New age Computing.

Raymond Wu, Masayuki Hisada, Atsushi Kara, Takafumi Hayashi

Proceedings of the 2010 International Conference on Internet Computing, 2010

Event Capture Approaches for Vulnerability Detection.

Raymond Wu, Masayuki Hisada, Atsushi Kara, Takafumi Hayashi

Proceedings of the 2010 International Conference on Security & Management, 2010

2009

A Class of Zero-Correlation Zone Sequence Set Using a Perfect Sequence.

Takafumi Hayashi

IEEE Signal Process. Lett., 2009

2008

Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence and a Complementary Sequence Pair.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008

A Novel Class of Zero-Correlation Zone Sequence Sets Constructed from a Perfect Sequence.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008

2007

An Integrated Sequence Construction of Binary Zero-Correlation Zone Sequences.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007

Zero-Correlation Zone Sequence Set Construction Using an Even-Perfect Sequence and an Odd-Perfect Sequence.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007

Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007

A Messaging Network to Realize an SOA-Based System.

Takafumi Hayashi, Hideyuki Fukuhara, Ryutaroh Fujita, Toshiaki Miyazaki, Senro Saito

Proceedings of the Seventh International Conference on Computer and Information Technology (CIT 2007), 2007

Optimal Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence.

Takafumi Hayashi

Proceedings of the Seventh International Conference on Computer and Information Technology (CIT 2007), 2007

Recognition Algorithm for Topographic Features.

Naoto Harada, Takafumi Hayashi, Naru Hirata, Hirohide Demura, Noriaki Asada

Proceedings of the Seventh International Conference on Computer and Information Technology (CIT 2007), 2007

2006

On Optimal Construction of Two Classes of ZCZ Codes.

Takafumi Hayashi, Shinya Matsufuji

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

Binary Zero-Correlation Zone Sequence Set Construction Using a Cyclic Hadamard Sequence.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

Ternary Sequence Set Having Periodic and Aperiodic Zero-Correlation Zone.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

Binary Zero-Correlation Zone Sequence Set Constructed from an M-Sequence.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

A Class of Two-Dimensional Signal Having a Flat Power Spectrum and a Low Peak Factor.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

2005

Upper Bounds of the Correlation Functions of a Class of Binary Zero-Correlation-Zone Sequences.

Takafumi Hayashi, Takao Maeda, Satoshi Okawa

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005

Binary Zero-Correlation Zone Sequence Set Construction Using a Primitive Linear Recursion.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005

2004

Binary array set having a cross-shaped zero-correlation zone.

Takafumi Hayashi, S. Okawa

IEEE Signal Process. Lett., 2004

Low-peak pseudo-white-noise arrays.

Takafumi Hayashi, S. Okawa

IEEE Signal Process. Lett., 2004

Synthesis of two-dimensional pseudo white-noise signal with low peak factor.

Takafumi Hayashi

IEEE Signal Process. Lett., 2004

A Generalization of Binary Zero-Correlation Zone Sequence Sets Constructed from Hadamard Matrices.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004

2003

Ternary Array Set Having a Zero-Correlation Zone.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003

A Class of Ternary Sequence Sets with a Zero-Correlation Zone for Periodic, Aperiodic, and Odd Correlation Functions.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003

Limits of the Correlation Function of a Class of Binary Zero-correlation-zone Sequences.

Takafumi Hayashi

Proceedings of the Signal and Image Processing (SIP 2003), 2003

2002

A class of two-dimensional binary sequences with zero-correlation zone.

Takafumi Hayashi

IEEE Signal Process. Lett., 2002

Speech Recognition Using Acoustic Similarity-Based Primitives.

Takafumi Hayashi, Hiroki Mori, Motoyuki Suzuki, Shozo Makino, Hirotomo Aso

Syst. Comput. Jpn., 2002

Binary Sequences with Orthogonal Subsequences and a Zero-Correlation Zone: Pair-Preserving Shuffled Sequences.

Takafumi Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2002

1999

An Automatic Acquisition of Acoustical Units for Speech Recognition Based on Hidden Markov Network.

Motoyuki Suzuki, Takafumi Hayashi, Hiroki Mori, Shozo Makino, Hirotomo Aso

Proceedings of the Discovery Science, 1999

1995

A diffusion model for computer animation of diffuse ink painting.

Tosiyasu L. Kunii, Gleb V. Nosovskij, Takafumi Hayashi

Proceedings of the Computer Animation 1995, 1995