1. Additional lead derivation for detecton of atrial fibrillation, collarboration research with Tohuku University Hospital, Basic research fund from Japan Society for the Promotion of Science, 2012~

2. Frequency analysis and signal-average P wave analysis for the diagnosis of atrial fibrillation, 2012~

3. Computer simulation of cardiac fibrillation by using implanted cardioverter fibrillator, collaboration research Toho University Medical Center, 2012~

4. Uconstained sleep mornitoring system, 2005~