提出绿色韧性框架,让人机协同系统在中断后快速节能恢复。
Green Resilience of Cyber-Physical Systems: Doctoral Dissertation
- 构建三状态模型识别系统运行阶段,支持自动故障检测。
- 多目标优化与强化学习策略缩短恢复时间,降低人类依赖。
- 适合关注智能系统可持续性与鲁棒性的研究者和工程师。
网络物理系统(CPS)融合计算与物理组件,其中在线协作人工智能系统(OL-CAIS)通过与人类协同在线学习以达成共同目标,易受干扰事件影响导致性能下降。决策者需在恢复性能的同时控制能源消耗,面临韧性与绿色性之间的权衡。本研究旨在建模OL-CAIS的韧性以实现自动状态识别,设计基于代理的策略优化绿色-韧性平衡,并理解灾难性遗忘以维持性能一致性。通过定义稳态、扰动态和终态三种运行状态,提出GResilience框架,采用多目标优化(单代理)、博弈论决策(双代理)和强化学习(RL代理)提供恢复策略。设计量化韧性与绿色性的评估框架。实证实验基于真实与模拟的协作机器人从人类示范中学习物体分类。结果表明,韧性模型能捕捉扰动期间的性能变化;GResilience策略显著缩短恢复时间,稳定性能并减少对人工干预的需求。其中RL代理策略表现最佳,虽略有增加碳排放。多次扰动后观察到灾难性遗忘,但所提策略有助于保持系统稳态。与容器化执行对比,后者使二氧化碳排放减半。整体上,本研究提供了保障OL-CAIS绿色恢复的模型、度量与策略。
原文摘要 · Abstract (English)
Cyber-physical systems (CPS) combine computational and physical components. Online Collaborative AI System (OL-CAIS) is a type of CPS that learn online in collaboration with humans to achieve a common goal, which makes it vulnerable to disruptive events that degrade performance. Decision-makers must therefore restore performance while limiting energy impact, creating a trade-off between resilience and greenness. This research addresses how to balance these two properties in OL-CAIS. It aims to model resilience for automatic state detection, develop agent-based policies that optimize the greenness-resilience trade-off, and understand catastrophic forgetting to maintain performance consistency. We model OL-CAIS behavior through three operational states: steady, disruptive, and final. To support recovery during disruptions, we introduce the GResilience framework, which provides recovery strategies through multi-objective optimization (one-agent), game-theoretic decision-making (two-agent), and reinforcement learning (RL-agent). We also design a measurement framework to quantify resilience and greenness. Empirical evaluation uses real and simulated experiments with a collaborative robot learning object classification from human demonstrations. Results show that the resilience model captures performance transitions during disruptions, and that GResilience policies improve green recovery by shortening recovery time, stabilizing performance, and reducing human dependency. RL-agent policies achieve the strongest results, although with a marginal increase in CO2 emissions. We also observe catastrophic forgetting after repeated disruptions, while our policies help maintain steadiness. A comparison with containerized execution shows that containerization cuts CO2 emissions by half. Overall, this research provides models, metrics, and policies that ensure the green recovery of OL-CAIS.
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