Research

1. Learning by Physics

1-1) The Tug-Of-War (TOW) Principle for Efficient Decision-Making: Efficient Learning based on Physical Conservation Law and Fluctuations

‘Bar Intelligence‘

1-2) ‘The TOW Bombe’ (named after Turing Bombe) for Solving Societal Problems: Efficient Problem-Solving based on Physical Conservation Law and Fluctuations

The TOW BOMBE that Can Solve the Competitive Multi-armed Bandit Problem

1-3) Decision-Making Devices based on the TOW Principle

Ionic Decision-Maker

1-4) Applications (IoT Communications, Behavioral Economics) based on the TOW Principle

Rock-Scissors-Paper Game

  

2. Cryptography and Random Number Generation

2-1) Statistical Test for Random Number Generator (RNG): Correction of Statistical Tests provided by the NIST (National Institute of Standards and Technology, USA)

The N1 Distribution of SHA1 with the corrected threshold and two different theoretical distributions.

2-2) Random Number Generator (RNG)

SEM images of Crystals
  • S. -J. Kim, & K. Umeno: Randomness Evaluation and Hardware Implementation of Non-additive CA-based Stream Cipher, J. Signal Processing 9(1), pp. 71-77 (2005)
Video Encryption-Decryption System

2-3) Chaos-based Communication System

The Chaos-based Communication System

3. Random Walk Approach for Time Series Analysis in Finance

3-1) Theory of Random Walk with Chaos

ETMSDs of a random walk using a time series generated by an Aizawa map with B = 1.7 (black circles) and B = 2.2 (red squares). The slope of each ETMSD indicates superdiffusion.