Based on some mathematical features of the model, some reformulations are necessary to solve the problem.The surrogate functions are used to reformulate the objective function and some constraints.

• 这些议题包括：多层网路规划法中各层间的调整机制、新应用环境下的有线电视网路规划问题、以及混合式光纤电缆有线电视网路规划问题。