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- Ken Umeno
- 1997

We present a new systematic method of constructing rational mappings as ergordic transformations with nonuniform invariant measures on the unit interval I = [0, 1]. As a result, we obtain aâ€¦ (More)

- Song-Ju Kim, Ken Umeno, Akio Hasegawa
- IACR Cryptology ePrint Archive
- 2004

It is well known that the NIST statistical test suite was used for the evaluation of AES candidate algorithms. We have found that the test setting of Discrete Fourier Transform test and Lempel-Zivâ€¦ (More)

- Ken Umeno
- 1998

Ergodic dynamical systems with absolutely continuous invariant probability measures are implemented as random-number generators for Monte Carlo computation. Such chaos-based Monte Carlo computationâ€¦ (More)

- Masahiko Kuraya, Atsushi Uchida, S. Yoshimori, Ken Umeno
- Optics express
- 2008

We experimentally demonstrate blind source separation of chaos generated in Nd:YVO(4) microchip solid-state lasers by using independent component analysis. Two chaotic source signals are linearlyâ€¦ (More)

- Ken Umeno
- 2008

Ergodic dynamical systems with absolutely continuous invariant probability measures are implemented as random-number generators for Monte Carlo computation. Such chaos-based Monte Carlo computationâ€¦ (More)

- Sue Ann Je Ho, Etsuro Hori, Tsuneyuki Kobayashi, Ken Umeno, Hisao Nishijo
- Neuroscience
- 2008

Hippocampal place cells encode location of animals in the environment. However, it remains unknown whether the hippocampal place cells encode a continuously moving object in the environment. Toâ€¦ (More)

- Hirofumi Tsuda, Ken Umeno
- ArXiv
- 2016

Recently, new spreading sequences have been proposed to multiplex the capacity of users. In particular, Weyl spreading sequences have the larger capacity of users than the Gold code. This paper showsâ€¦ (More)

- Atsushi Iwasaki, Ken Umeno
- ArXiv
- 2016

Vector Stream Cipher (VSC) is a stream cipher which consists of permutation polynomial over a ring of modulo 2w. The algorithm for generating key stream is very simple and the encryption is veryâ€¦ (More)

- Ken Umeno
- 2008

We review recent developments about a systematic method of constructing of rational mappings as ergordic transformations with nonuniform invariant measures on the unit interval I = [0, 1]. Allâ€¦ (More)

- Ryo Takahashi, Ken Umeno
- IEICE Transactions
- 2014

In this study, a performance of a synchronous code division multiple access (CDMA) using the chaotic spreading sequences with constant power is estimated in indoor power line fading channels. It isâ€¦ (More)