A North Carolina native and chief academic officer at a small Massachusetts college is taking over as chancellor of Winston-Salem State University. On Friday, the board of governors of the University of North Carolina selected Elwood Robinson, Cambridge College provost, for the Winston-Salem State post. Robinson takes over the historically black public university in Winston-Salem in January. He replaces Donald Reaves, who is leaving after eight years as chancellor. The 58-year-old Robinson is a native of Sampson County who graduated magna cum laude from North Carolina Central University in 1978. He spent about two years at Cambridge College, a private school with 5,000 students.