SU(3)× SU(2)× U(1) Chiral Models from Intersecting D4-/D5-Branes

We clarify RR tadpole cancellation conditions for intersecting D4-/D5-branes. We determine all of the D4-brane models that have D = 4 three-generation chiral fermions with SU(3) x SU(2) x U(1)(n) symmetries. For the D5-brane case, we present a solution to the conditions that gives exactly the matter content of the standard model with U(1) anomalies.