So an adaptive method of updating pheromone and a mutation strategy of clearing up invalid assignment were introduced to increase convergent speed.

为此，提出一种自适应的信息素更新方法和消除无效分配的变异策略，提高了收敛速度。

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Furthermore, according to the features of the pheromone strewing when solving the problem by ant colony algorithm, the strewing method and updating strategy of pheromone were reconstructed.

此外，根据蚁群算法处理本问题时信息素散播的特点，重构了信息素的更新策略和散播方式。

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The pheromone-updating mechanism is improved by threshold of the fitness function in presented method;

该方法设定适应度函数阈值改进了蚁群算法的信息素更新机制；

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The pheromone-updating mechanism is improved by threshold of the fitness function in presented method;

该方法设定适应度函数阈值改进了蚁群算法的信息素更新机制；

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