Tom Reslewic has joined the board of LeCroy Corp., provider of electronic signal acquisition and analysis products and services. Reslewic became CEO on Jan. 1.   . . .   John M. Casey was named president of Teradyne's Assembly Test Div., replacing Robert Dutkowsky, who left the company.   . . .   Karl L. Wang was named vice president of design technology at semiconductor foundry UMC.   . . .   Semiconductor Equipment and Materials International (SEMI) presented its third annual Bob Graham Awards for outstanding contributions in the field of semiconductor equipment and materials marketing to Jerry Hutcheson, founder and chairman, VLSI Research Inc., and Edward Segal, president and CEO, Metron.