Core Viewpoint - Professor Wang Shiying, a retired teacher and doctoral supervisor from Tsinghua University's Department of Electrical Engineering and Applied Electronic Technology, passed away on January 2, 2026, in Texas, USA, at the age of 93 [1] Group 1: Academic Contributions - Professor Wang was born in Shanghai in 1932 and enrolled in Tsinghua University in 1950, graduating with a master's degree in 1956 [1] - He served as the deputy director of the Power Generation Research Group from 1961 to 1979 and as the director of the Power System and Automation Research Group from 1979 to 1986 [1] - He developed and taught courses such as "Power System Automation" and "Principles of Automatic Control" and authored textbooks including "Power System State Estimation" [1] Group 2: Research and Development - Wang began research in power system state estimation theory in the 1970s and published pioneering papers on bad data identification internationally [1] - In 1988, he led a project to develop real-time state estimation application software for the Northeast Power Grid, achieving online operation of state estimation and other advanced EMS applications, which won the National Science and Technology Progress Award (Second Class) in 1992 [1] - He was proactive in aligning with the latest international research directions, initiating academic studies in "static security analysis" and "expert systems" in China [1]