1. Information Theory

• Shannon Theory
• Multi-user Information Theory
• Rate-Distortion Theory
• Information Theoretic Security
• Channel coding with feedback
• Information Spectrum Theory
• Lossless Data Compression Codes
• AIFV Codes and AIVF Codes
• Universal Data Compresion Codes
• Universal Representation of Positive Integers
• Competitively Optimal Codes
• Network Coding
• Channel Coding
• Polar Coding
• LDPC Coding
• Convolutional Coding
• Fast numerical caluculation algorithms for transfer function bounds
• TCM (Trellis Coded Modulation) Schemes
• Channel coding with feedback
• Coding for Mobile Channels
• Applications of Information Theory
• Machine Learning
• etc.

2. Cryptology / Information Security

• Information Theoretic Security
• Secret Sharing Schemes
• General Secret Sharing Schemes
• Visual Secret Sharing Schemes
• Quantum Secret Sharing Schemes
• Complexity and Randomness Test
• Subset Sum Problem (Knapsack Problem)
• Fast Calucation of Exponentiation
• Electronic Money
• etc.

3. Other fields (in Japanese)