“Digital Currency” Recently, Digital Currency is proceeding, but limited to wallets for purchase. To proceed more, digital currency must be applied to assets classes. Then, paper and coins currency can be invalid. If digital currency is applied to assets and used in smartphones, various types of Bonds and Securities are possible. Digital Currency is associated with Personal Information, and it causes fear and intrust to own government for some people. This problem can be solved by fear to lose money. If paper and coins are invalid, people must use digital currency. To proceed Digital Currency, deleting trust for Bitcoin is good way. Bitcoin is used for dark money, and not in control by trustable organizations. Digital Currency by government can compete Bitcoin if the government is trustable. In addition, Bitcoin has several deep security risk by hackers. Roll back is impossible when hackers steal Bitcoin.
2021/5/25. The Working Memory(WM) Working memory https://en.wikipedia.org/wiki/Working_memory Working memory(WM) is a small memory in human brain which can hold temporal information. WM is the part of short-term memory which is concerned with immediate conscious perceptual and linguistic processing. WM is just like a memory on computer. I have heard that training WM was important for doing tasks on job. Recently, I felt that I could training my WM with some smartphone’s app. And I found that N back task may be effective to train WM. N-back https://en.wikipedia.org/wiki/N-back There are some variations in N back task. I bought one app which train my WM by remembering about numbers of figure. https://apps.apple.com/jp/app/nバック/id591320567 I found that N-back task is consisted from load power and cycle number. Load power is number of N, and cycle number is number which I solved N task. Training WM is just like training muscle. Now, I could score 60 times with N