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Embracing conflicts: Exploiting inconsistencies in distributed schedules using Simple Temporal Network representations.

机译:拥抱冲突:使用简单时态网络表示法利用分布式计划中的不一致之处。

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摘要

Simple Temporal Networks (STNs) provide key advantages in dealing with dynamic, uncertain schedule execution environments. However, they have received scant attention in distributed scheduling domains A key limitation has been that STNs require consistency of all temporal information for continued operation. Unfortunately, consistency cannot always be guaranteed, as agents frequently have conflicting information due to a variety of factors.;This thesis investigates three important issues surrounding the use of Simple Temporal Networks (STNs) in a distributed scheduling environment. We first present strategies to recover from the inconsistent information that naturally arises during schedule execution. We leverage the conflict analysis tools presented by the STN framework to detect, explain and resolve these inconsistencies. The conflict explanation produces an analysis of the inconsistency, identifying the conflicting temporal constraints. Using this analysis, we present a set of conflict resolution actions that an agent can use to restore its STN to a consistent state.;Conflict explanation can also be used on inconsistencies encountered during the scheduling process to enhance the multi-agent schedule. This thesis develops strategies that increase the robustness of the schedule, and enable agents to update previous commitments they had made to each other. To enhance the fault-tolerance of a multi- agent schedule, we have developed Just-in-Time Backfilling (JIT-BF), a strategy for agents with a model of durational uncertainty to monitor their "close to execution" scheduled activities for potential failures, and take action to prevent these failures by scheduling redundant activities.;We conclude this thesis by presenting a conflict-driven coordination approach to updating existing temporal commitments between agents. When an agent fails to schedule a new activity because of conflicts with the scheduled activities of other agents, the resulting inconsistency can be analyzed to discover what these conflicting activities are, and by how much they need to move to allow the new activity to be scheduled. We present two alternative strategies to perform these coordinated schedule updates. The strategies provide a trade-off between the amount of information an agent needs to initiate a coordination session, and the time needed for coordination.
机译:简单时态网络(STN)在处理动态,不确定的时间表执行环境中具有关键优势。但是,它们在分布式调度域中很少受到关注。一个关键限制是STN要求所有时间信息的一致性才能继续运行。不幸的是,由于代理经常由于各种因素而导致信息冲突,因此无法始终保证一致性。本论文研究了在分布式调度环境中使用简单时态网络(STN)的三个重要问题。我们首先提出从计划执行过程中自然产生的不一致信息中恢复的策略。我们利用STN框架提供的冲突分析工具来检测,解释和解决这些不一致之处。冲突说明将对不一致进行分析,从而确定冲突的时间约束。使用此分析,我们提出了一组冲突解决操作,代理可以将其用于将其STN恢复到一致状态。冲突说明也可以用于调度过程中遇到的不一致之处,以增强多代理调度。本文提出了可以提高进度计划的鲁棒性的策略,并使代理能够更新彼此之间先前的承诺。为了增强多座席计划的容错能力,我们开发了即时回填(JIT-BF),这是一种针对具有持续不确定性模型的座席的策略,以监控其“接近执行”的计划活动的潜力失败,并采取措施通过安排冗余活动来防止这些失败。;我们通过提出一种冲突驱动的协调方法来更新代理之间的现有时间承诺来结束本文。当一个座席由于与其他座席的已安排活动发生冲突而无法安排新活动时,可以分析由此产生的不一致性,以发现这些冲突活动是什么,以及它们需要移动多少才能允许安排新活动。我们提出了两种替代策略来执行这些协调的计划更新。这些策略在座席启动协调会话所需的信息量与协调所需的时间之间进行权衡。

著录项

  • 作者

    Gallagher, Anthony.;

  • 作者单位

    Carnegie Mellon University.;

  • 授予单位 Carnegie Mellon University.;
  • 学科 Engineering Robotics.;Artificial Intelligence.;Computer Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 242 p.
  • 总页数 242
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自动化技术、计算机技术;人工智能理论;
  • 关键词

  • 入库时间 2022-08-17 11:38:27

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