- Computer Mediated Communication [Ph.D.]
- Text Chat (History, effect/effort of short text messaging, incl. backchannel)
- Natural Language Processing (Japanese)
- Human Computer Interaction (Interface)
- Sensor Network
- Raspberry Pi (Prototyping, production)
- Bluetooth LE (Central, iBeacon, Android app, production)
- PIC (hobby)
- Statistics
- SPSS (hobby)
- LibSVM (hobby)
- Hadoop (production)
- BigQuery (hobby)
- R (hobby)
- Programming
- Java (SAStruts, AWS SDK, production)
- Java/Kotlin (Android app, production)
- C# (Windows Forms, hobby)
- C# (Unity, production)
- JavaScript (Browser, non-framework, hobby)
- JavaScript (Node.js, IoT, hobby)
- Python (IoT, production)
- PHP (CakePHP, non-framework, production)
- SQL (MySQL, production)
- HTML/CSS (production)
- WinSCP (Japanese)
- SumatraPDF (Japanese)