Open Heavy Flavor Production in p+p, d+Au and Au+Au Collisions at   $\sqrt(s)= 200$ GeV
  PHENIX results for open charm production from semi-lepton decay in p+p, d+Au and Au+Au collisions in a wide rapidity ranges at $\sqrt(s)= 200$ GeV are presented. Keywords: Relativistic Heavy-ion Collision, Open Charm production, Nuclear Medium Effect PACS: 25.75.-q, 25.75 Dw, 13.20.Gd 
Xiaorong Wang (1) (the PHENIX collaboration), ((1)New Mexico State   University)