Samuel Dalembert arrived in Milwaukee Monday as the new big man for the Bucks.   Milwaukee acquired the 6-11 veteran from the Houston Rockets in a pre-draft trade that sent Jon Leuer, John Brockman and Shaun Livingston to Houston.   The Bucks were in need of a defensive minded big man after trading Andrew Bogut to Golden State for guard Monta Ellis last season.  Dalembert is an 11 year veteran who started his career with the Philadelphia 76ers with stops in Sacramento and Houston.  He's averaged 8.2 rebounds and nearly 2 blocked shots a game over his 727 game career.