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Handling temporal constraints with preferences in HTN planning for emergency decision-making

机译：在HTN规划中优先处理时间限制以进行紧急决策

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摘要

HTN (Hierarchical Task Network) planning has shown its effectiveness and potential in emergency decision-making. In realistic emergency conditions, the temporal preferences should be considered. This paper proposes a temporal HTN planner, TPHTN (Temporal Preferences HTN), to handle the temporal constraints with preferences. The planner uses STNP (Simple Temporal Networks with Preferences) to express the temporal preferences information, and extends the operator and method to express the temporal preferences information in planning domain knowledge. In the planning process, TPHTN propagates the STNP top-down, and three definitions of level consistency are proposed to estimate the quality of STNP, and a new heuristic search is designed to choose the suitable operator/method to apply based on the quality of the corresponding STNP. When the planning process is terminated, TPHTN will generate a plan satisfying the decision-makers preferences. Finally, the effectiveness and practicability of TPHTN are demonstrated with emergency logistics problems.
机译：HTN（分层任务网络）规划已显示出其在应急决策中的有效性和潜力。在现实的紧急情况下，应考虑时间偏好。本文提出了一种时间HTN计划程序TPHTN（时间偏好HTN），以处理具有偏好的时间约束。计划者使用STNP（带有首选项的简单时态网络）来表达时态偏好信息，并在规划领域知识中扩展运算符和方法来表达时态偏好信息。在规划过程中，TPHTN从上到下传播STNP，并提出了三个级别一致性定义来评估STNP的质量，并设计了一种新的启发式搜索，以根据STNP的质量选择合适的运算符/方法。对应的STNP。当计划过程终止时，TPTHN将生成一个满足决策者偏好的计划。最后，通过应急物流问题证明了TPHTN的有效性和实用性。

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