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My research focus is on understanding network dynamics from a global view, which contributes to turning the Internet into a simpler, more flexible and more dependable communication infrastructure. The Internet that is an inter-network of distributed autonomous networks shows surprisingly complex behaviors due to interference of various technologies. For example, a local optimization sometimes has a negative impact to the global system, and such a global impact is often overlooked. We also need to take it into consideration that, even if there is no problem at the moment, it might affect future technical evolution. It is important for the global Internet that we look at technologies with a global perspective, and understand their technical impacts as well as social impacts.