In this paper, we consider the design problem of an unknown-input observer for distributed network systems under existence of communication delays. It is assumed that an input of each node in a network is calculated f...
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In this paper we consider an event-triggered solution to the consensus problem of multi-agent systems. Our main contribution consists of the use of an integral based approach that is shown to reduce the conservatism i...
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ISBN:
(纸本)9783952426937
In this paper we consider an event-triggered solution to the consensus problem of multi-agent systems. Our main contribution consists of the use of an integral based approach that is shown to reduce the conservatism intrinsic in the use of Lyapunov methods.
Detecting faults in distributed network systems is challenging because of their complexity, but this is required to evaluate and improve their reliability. This paper proposes ChaT, a testing and evaluation methodolog...
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ISBN:
(纸本)9781728181042
Detecting faults in distributed network systems is challenging because of their complexity, but this is required to evaluate and improve their reliability. This paper proposes ChaT, a testing and evaluation methodology under system reconfigurations and perturbations for distributed network systems, to evaluate QoS reliability by discriminating safe and failure-prone behaviors from different testing scenarios. Motivated by metamorphic testing technique that removes the burden of defining software oracles, we propose some metamorphic relationships that correlate system inputs and outputs to find patterns in executions. Classification techniques based on machine learning (principal component analysis and support vector machine) are used to identify system states and validate the proposed metamorphic relationships. These metamorphic relationships are also used to help anomaly detection. We verify this with several anomaly detection techniques (isolation forest, one-class SVM, local outlier factor, and robust covariance) that categorize experiments belonging to either safe or failure-prone states. We apply ChaT to a video streaming application use case. The simulation results show the effectiveness of ChaT to achieve our goals: identifying execution classes and detecting failure-prone experiments based on metamorphic relationships with high level of statistical scores.
distributed network systems can be utilized to measure environmental conditions such as temperature, sound, pollution levels, humidity, wind, and so on. Multiple autonomously moving mobile sensors are used to construc...
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distributed network systems can be utilized to measure environmental conditions such as temperature, sound, pollution levels, humidity, wind, and so on. Multiple autonomously moving mobile sensors are used to construct distributed sensor networks in an unknown cluttered 3-D workspace. The proposed strategy is to deploy mobile sensors (robots) sequentially and individually to extend the network until the network fully covers the entire open space. This strategy results in 3-D sensor networks without sensing holes and does not require global localization of a robot except for a single robot called the Communication Navigation Aid. The authors believe this article is unique in constructing sensor networks in 3-D workspaces cluttered with many obstacles. Moreover, this article presents an innovative recovery algorithm to handle sensor failures in the constructed network. network connectivity is maintained while robots move in unknown 3-D cluttered environments. Once a robot is deployed at its designated location, it becomes localized in global coordinate systems. Utilizing MATLAB, the effectiveness of the proposed deployment methods is demonstrated.
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