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摘要: 在移动计算环境下,基于准确的操作代价估算结果来选择合适的连接查询处理模式,可以减少数据的传输量和移动设备的能量消耗。探讨了该环境下移动设备能量消耗的一个新的非对称特征,提出了一种操作代价估算方法,并从数据传输量和能量消耗两个方面对连接查询处理模式进行了代价估算和性能比较,提出了4个实用准则,以指导连接查询处理模式的选择。试验结果充分论证了估算方法和准则的正确性,且比现有同类估算模型和结论具有更加广泛的应用范围。