Cook noodles according to package directions. Drain, rinse under cold water to cool, and drain again. In a small saucepan, combine sugar, vinegar, soy sauce and oil. Heat over low flame, stirring, until sugar melts. Remove from heat and chill. Place noodles on a large platter, then top with lettuce, cucumber, carrot, ham and cilantro. Sprinkle top with sesame seeds. Pour chilled dressing over salad.