Construction of Optimal Chaotic Spreading Sequence Using Lebesgue Spectrum Filter. - Ken Umeno; Akihiro Yamaguchi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2002)

Corrections of the NIST Statistical Test Suite for Randomness. - Song-Ju Kim; Ken Umeno; Akio Hasegawa (IACR Cryptol. ePrint Arch., 2004)

Solvable Performances of Optimization Neural Networks with Chaotic Noise and Stochastic Noise with Negative Autocorrelation. - Mikio Hasegawa; Ken Umeno (ICONIP (1), 2007)

FPGA implementation of EASI algorithm. - Song-Ju Kim; Ken Umeno; Ryo Takahashi (IEICE Electron. Express, 2007)

Employing LSF at Transmitter Eases MMSE Adaptation at Receiver in Asynchronous CDMA Systems. - Masahiro Yukawa; Ken Umeno; Gen Hori (EURASIP J. Wirel. Commun. Netw., 2008)

Chaos-based communication systems using on-line ICA algorithm. - Song-Ju Kim; Ken Umeno (IEICE Electron. Express, 2008)

Performance Analysis of Complex CDMA Using Complex Chaotic Spreading Sequence with Constant Power. - Ryo Takahashi; Ken Umeno (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Performance Evaluation of Band-Limited Baseband Synchronous CDMA Using Orthogonal ICA Sequences. - Ryo Takahashi; Ken Umeno (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

Inner angle of triangle on unit circle made of consecutive three points generated by chaotic map. - Ryo Takahashi; Etsushi Nameda; Ken Umeno (JSIAM Lett., 2010)

Correlational properties of two-dimensional solvable chaos on the unit circle - Aki-Hiro Sato; Ken Umeno (CoRR, 2012)

Chaotic Method for Generating $q$-Gaussian Random Variables. - Ken Umeno; Aki-Hiro Sato (IEEE Trans. Inf. Theory, 2013)

Performance Evaluation of CDMA Using Chaotic Spreading Sequence with Constant Power in Indoor Power Line Fading Channels. - Ryo Takahashi; Ken Umeno (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Periodicity of odd degree Chebyshev polynomials over a ring of modulo $2^w$. - Atsushi Iwasaki; Ken Umeno (CoRR, 2016)

Further improving security of Vector Stream Cipher. - Atsushi Iwasaki; Ken Umeno (CoRR, 2016)

SNR Maximization as a Non-Linear Programming -Towards Optimal Spreading Sequence-. - Hirofumi Tsuda; Ken Umeno (CoRR, 2016)

Non-Linear Programming: Maximize SNR for Designing Spreading Sequence - Part I: SNR versus Mean-Square Correlation. - Hirofumi Tsuda; Ken Umeno (CoRR, 2016)

Non-Linear Programming: Maximize SNR for Designing Spreading Sequence - Part II: Conditions for Optimal Spreading Sequences. - Hirofumi Tsuda; Ken Umeno (CoRR, 2016)

Numerical Approach to Maximize SNR for CDMA Systems. - Hirofumi Tsuda; Ken Umeno (CoRR, 2016)

Orthogonal basis spreading sequence for optimal CDMA. - Hirofumi Tsuda; Ken Umeno (JSIAM Lett., 2016)

Method to Design UF-OFDM Filter and its Analysis. - Hirofumi Tsuda; Ken Umeno (CoRR, 2017)

One-stroke polynomials over a ring of modulo $2^w$. - Atsushi Iwasaki; Ken Umeno (JSIAM Lett., 2017)

Randomness Evaluation With the Discrete Fourier Transform Test Based on Exact Analysis of the Reference Distribution. - Hiroki Okada 001; Ken Umeno (IEEE Trans. Inf. Forensics Secur., 2017)

Randomization Algorithm for Partial Transmit Sequence with Semidefinite Relaxation. - Hirofumi Tsuda; Ken Umeno (VTC Fall, 2018)

Randomization Approaches for Reducing PAPR with Partial Transmit Sequences and Semidefinite Relaxation. - Hirofumi Tsuda; Ken Umeno (CoRR, 2018)

Randomness Test to Solve Discrete Fourier Transform Test Problems. - Atsushi Iwasaki; Ken Umeno (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

Weyl Spreading Sequence Optimizing CDMA. - Hirofumi Tsuda; Ken Umeno (IEICE Trans. Commun., 2018)

Non-Linear Programming: Maximize SINR for Designing Spreading Sequence. - Hirofumi Tsuda; Ken Umeno (IEEE Trans. Commun., 2018)

Investigation of the difference between Chaos Degree and Lyapunov exponent for asymmetric tent maps. - Tomoyuki Mao; Hidetoshi Okutomi; Ken Umeno (JSIAM Lett., 2019)

Chaotic property of almost periodic frequency arrangement (APFA). - Isao Nakazawa; Ken Umeno (JSIAM Lett., 2020)

Demonstration of wireless power coloring. - Masataka Motoyama; Ken Umeno (IEICE Electron. Express, 2021)

Randomization Approaches for Reducing PAPR with Partial Transmit Sequence and Semidefinite Relaxation. - Hirofumi Tsuda; Ken Umeno (IEICE Trans. Commun., 2021)

Time-Rescaling regression method for exponential decay time series predictions. - Masaru Shintani; Ken Umeno (JSIAM Lett., 2022)

General dynamic pricing algorithms based on universal exponential booking curves. - Masaru Shintani; Ken Umeno (JSIAM Lett., 2022)

The Reference Distributions of Maurer's Universal Statistical Test and Its Improved Tests. - Yasunari Hikima; Atsushi Iwasaki; Ken Umeno (IEEE Trans. Inf. Theory, 2022)

Analysis of the limit values of chaos degree for infinite number of partitions in asymmetric tent maps. - Tomoyuki Mao; Hidetoshi Okutomi; Ken Umeno (JSIAM Lett., 2023)

Independent component analysis communication using complex spreading sequence with constant power. - Hiroki Matsuyama; Minghui Kao; Ken Umeno (JSIAM Lett., 2023)

Super orthogonal chaos codes with primitive roots. - Hiroki Matsuyama; Minghui Kao; Ken Umeno (JSIAM Lett., 2023)

Investigating Dynamical Complexity and Fractal Characteristics of Bitcoin/US Dollar and Euro/US Dollar Exchange Rates around the COVID-19 Outbreak. - Pavlos I. Zitis; Shinji Kakinaka; Ken Umeno; Michael P. Hanias; Stavros G. Stavrinides; Stelios M. Potirakis (Entropy, 2023)

The Impact of COVID-19 on Weak-Form Efficiency in Cryptocurrency and Forex Markets. - Pavlos I. Zitis; Shinji Kakinaka; Ken Umeno; Stavros G. Stavrinides; Michael P. Hanias; Stelios M. Potirakis (Entropy, 2023)

Learnability of chaotic nature of generalized Boole transformations with GANs. - Suguru Iwasaki; Ken Umeno (JSIAM Lett., 2024)

Chaotic synchronization of mutually coupled nonchaotic systems. - Keishi Takahisa; Ken Umeno (JSIAM Lett., 2024)