求翻译：按照传统交通控制思想，变周期控制模型应该具有更好的优化结果，而构建的四种优化模型中，定周期模型比变周期模型略优。实际仿真应用中，定周期模型每个周期都进行一次配时方案调整；而变周期模型为了减少周期频繁变动，每4个周期才进行一次配时方案调整，配时方案调整方式不同，可能的导致二者性能差异的原因，具体结论还需进一步研究。是什么意思？

Variable cycle control model in accordance with the traditional traffic control thought, should have better optimization results, the four optimization model is built, the fixed-cycle model change cycle model is slightly better. The actual simulation applications, each cycle of the fixed-cycle model

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