SUN (System and Ubiquitous Networking) is a research group in the Institute of Trustworthy Networks and Systems, School of Software, Tsinghua University, Led by Dr. Yuan He, SUN originated its research from large-scale sensor network systems and later extended the research scope to the wide areas of Internet of Things and Ubiquitous Computing. Besides pursuing high-quality research results, the SUN group takes unremitting efforts to implement those results in a variety of application fields, such as the energy Internet, smart human-computer interaction, smart city, smart home, etc.