Tatsuo UNEMI, Department of Information Systems Science, Soka University Multiagent model simulation: Effects of people’s gatherings, Effects of contact tracing, Effects of random tests 2020.12.01 #RA4 Simulation and designing countermeasures against possible COVID-19 resurgence: predicting spreading of infection, estimating and verifying the effectiveness of countermeasures, and predicting deman #Soka University Department of Information Systems Science, Soka University