Physical Statistics Laboratory - KYOTO UNIVERSITY

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Ken UMENO

Professor, Kyoto University

Department Chairman

Address
Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501 JAPAN

Physical Statistics Group,
Course of Mathematical Physics,
Department of Applied Mathematics & Physics,
Graduate School of Informatics,
Kyoto University

Laboratory
313, Faculty of Engineering Integrated Research Bldg.
Yoshida Main Campus, Kyoto University

URL
http://chaosken.amp.i.kyoto-u.ac.jp

TEL & FAX
+81-(0)75-753-4919

E-mail
umeno.ken.8z[at]kyoto-u.ac.jp
（[at]→@）

Selected Publications

・K. Umeno and M. H. Kao, "Chaos Theory as the answer to limited spectrum?", ITU News, No.10, 2013.

・Chen-An Yang, Kung Yao, Ken Umeno and Ezio Biglieri, "Using Deterministic Chaos for Superefficient Monte Carlo Simulations", IEEE Circuits and Systems Magazine, 13 (2013), pp.26 - 35.

・K. Umeno and A.-H. Sato, "Chaotic Method for Generating q-Gaussian Random Variables", IEEE Transactions on Information Theory, 59 (2013), pp.3199-3209.

・Ken Umeno, "Performance of Chaotic Monte Carlo Computations and Chaos Codes for Communications: Theory and Experiments", AIP Conference Proceedings, 1339 (2011), pp.197-209.

・K Umeno, "Independent Component Analysis of Mixed ChaoticSignals for Communications Systems", Nonlinear Phenomena in Complex Systems, 10 (2007), pp.170-175.

・SJ Kim, K Umeno, A Hasegawa, "Corrections of the NIST Statistical Test Suite for Randomness", arXiv preprint nlin/0401040 (2004).

・K Umeno, A Yamaguchi, "Construction of Optimal Chaotic Spreading Sequence Using Lebesgue Spectrum Filter", IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences, E85-A (2002), pp.849-852.

・CC Chen, K Yao, K Umeno, E Biglieri, "Design of spread-spectrum sequences using chaotic dynamical systems and ergodic theory", IEEE Transactions on Circuits and Systems I, 48 (2001), pp.1110-1114.

・K Umeno, "SNR analysis for Orthogonal Chaotic Spreading Sequences", Nonlinear Analysis, 47 (2001), p.5753.

・K Umeno, "Statistical simulation method and corresponding simulation system responsive to a storing medium in which statistical simulation program is recorded", US Patent No. 6,289,296 (Granted on September 11, 2001)

・K Umeno, K Kitayama, "Apparatus for optically generating chaotic random numbers", US Patent No. 6,263,146 (Granted on July 17, 2001)

・K Umeno, "Chaotic Monte Carlo Computation: A Dynamical Effect of Random-Number Generations", Japanese Journal of Applied Physics, 39 (2000), p.1442.

・K Umeno, K Kitayama, "Improvement of SNR with chaotic spreading sequences for CDMA", IEEE Proc.Information Theory and Communications Workshop (1999), p.106.

・K Umeno, K Kitayama, "Spreading sequences using periodic orbits of chaos for CDMA", Electronics letters, 35 (1999), pp.545-546.

・K Umeno, "Superposition of chaotic processes with convergence to Lévy’s stable law", Physical Review E, 58 (1998), pp.2644-2647.

・K Umeno, "Method of constructing exactly solvable chaos", Physical Review E, 55 (1997), pp.5280-5284.

・K Umeno, "Non-integrable character of Hamiltonian systems with global and symmetric coupling", Physica D, 82 (1995), pp.11-35.

・K Umeno, M Suzuki, "Symplectic and intermittent behaviour of Hamiltonian flow", Physics Letters A, 181 (1993), pp.387-392.

・K Umeno, M Suzuki, "A singular zeta function at the onset of chaos", Physics Letters A, 177 (1993), pp.311-315.

Academic Papers

＊Recent

Ryo Takahashi and Ken Umeno, "Performance Evaluation of CDMA Using Chaotic Spreading Sequence with Constant Power in Indoor Power Line Fading Channels", IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. (2014, in press).　NEW
K. Umeno and M. H. Kao, "Chaos Theory as the answer to limited spectrum?", ITU News, No.10, 2013.
Chen-An Yang, Kung Yao, Ken Umeno and Ezio Biglieri, "Using Deterministic Chaos for Superefficient Monte Carlo Simulations", IEEE Circuits and Systems Magazine, 13 (2013), pp.26 - 35.
Ken Umeno, "Statistical Mechanics of Information", Mathematical sciences (in Japanese) No. 600 (2013), pp. 35-41.
K. Umeno and A.-H. Sato, "Chaotic Method for Generating q-Gaussian Random Variables", IEEE Transactions on Information Theory, 59 (2013), pp.3199 - 3209.

Preprints

Correlational properties of two-dimensional solvable chaos on the unit circle
A. H. Sato and K. Umeno
submitted on August 30, 2012

Chaotic Method for Generating q-Gaussian Random Variables
K. Umeno and A. H. Sato
submitted on May 8, 2012, and accepted for publication in IEEE Trans. on Information Theory on December 26, 2012

Chaos Approach to Spectrum Management
from International Telecommunication Union

US Patents

List of US Patents invented by Ken Umeno

1.　US Patent No.8,285,773

A. Cichocki, R. Zdunek, S. Amari, G. Hori and K. Umeno, Signal separating device, signal separation method, information recording medium, and program (Granted on October 9, 2012)

2.　US Patent No. 8,265268

K. Umeno, Converter, encryption/decryption system, multi-stage converter, converting method, multi-stage converting method, program, and information recording medium (Granted on September 11, 2012)

3.　US Patent No.7,925,014

Random number generating, encrypting, and decrypting apparatus, method thereof, program thereof, and recording medium thereof　(Granted on April 12, 2011)

4.　US Patent No.7,697,590

Communicating apparatus and communicating method　(Granted on April 13, 2010)

5.　US Patent No. 7,577,182

Transmitter apparatus, receiver apparatus, transmission method, reception method and program (Granted on August 18, 2009)

6.　US Patent No. 7,548,618

Converter, encryption/decryption system, multi-stage converter, converting method, multi-stage converting method, program, and information recording medium (Granted on June 16, 2009)

7.　US Patent No. 7,472,147

Random number string output apparatus, random number string output method, program, and information recording medium (Granted on December 30, 2008)

8.　US Patent No. 7,471,714

Random number sequence sharing system, random number sequence sharing apparatus, codec system, coding apparatus, decoding apparatus, random number sequence sharing method, coding method, decoding method, and program product (Granted on December 30, 2008)

9.　US Patent No. 7,466,780

Pseudo-random number sequence filter, filtering method and data recording medium (Granted on December 16, 2008)

10.　US Patent No. 7,421,463

Random sequence generating apparatus, encryption/decryption apparatus, random sequence generating method, encryption/decryption method and program (Granted on September 2, 2008)

11.　US Patent No. 7,411,997

Apparatus and method for filtering a spectrum spread communication (Granted on August 12, 2008)

12.　US Patent No. 7,317,763

Pulse generator, pulse generating method, communicating apparatus, and communicating method (Granted on January 8, 2008)

13.　US Patent No. 7,257,608

Apparatus and method for outputting sequence of vectors, data recording medium, and carrier wave signal (Granted on August 14, 2007)

14.　US Patent No. 7,237,110

Authentication system, authentication apparatus, authentication target apparatus, authentication method, method of being authenticated, program and information recording medium (Granted on June 26, 2007)

15.　US Patent No. 7,231,048

Key sharing system, public key cryptosystem, signature system, key sharing apparatus, encryption apparatus, decryption apparatus, signature apparatus, authentication apparatus, key sharing method, encryption method, decryption method, signature method, authentication method, and programs (Granted on June 12, 2007)

16.　US Patent No. 7,099,366

Pseudo-random number sequence output unit, transmitter, receiver, communication system and filter unit (Granted on August 29, 2006)

17.　US Patent No. 6,832,233

Apparatus and method for computing multiple integral, and recording medium (Granted on December 14, 2004)

18.　US Patent No. 6,668,265

Apparatus and method for outputting sequence of vectors, data recording medium, and carrier wave signal (Granted on December 23, 2003)

19.　US Patent No. 6,661,831

OUTPUT APPARATUS, TRANSMITTER, RECEIVER, COMMUNICATIONS SYSTEM FOR OUTPUTTING, TRANSMITTING AND RECEIVING A PSEUDORANDOM NOISE SEQUENCE, AND METHODS FOR OUTPUTTING, TRANSMITTING RECEIVING PSEUDORANDOM NOISE SEQUENCES AND DATA RECORDING MEDIUM (Granted on December 9, 2003)

20.　US Patent No. 6,654,404

System, apparatus, and method for outputting pseudorandom noise sequences, and data recording medium (Granted on November 25, 2003)

21.　US Patent No. 6,477,481

Device and method for outputting stochastic processes, and data recording medium (Granted on November 5, 2002)

22.　US Patent No. 6,289,296

Statistical simulation method and corresponding simulation system responsive to a storing medium in which statistical simulation program is recorded (Granted on September 11, 2001)

23.　US Patent No. 6,263,146