In order to analyze and optimize the structure of existing permanent magnet spherical motors, a method for 3D motion singularity analysis of permanent magnet spherical motors is presented in this paper. This calculati...
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The usage of wireless networks for networked controlled systems (NCS) impose constraints on the required radio resources to ensure the desired quality-of-control (QoC). Usually, controlsystems are designed regardless...
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ISBN:
(纸本)9781665454681
The usage of wireless networks for networked controlled systems (NCS) impose constraints on the required radio resources to ensure the desired quality-of-control (QoC). Usually, controlsystems are designed regardless of the wireless system and could misuse current wireless technologies capabilities by utilizing more resources than required and limiting the number of users accessing the network. However, the goal of Communications-control Co-Design (CoCoCo) is to enable better usage of the communications resources by exploiting the knowledge of the degrees of freedom of the control system. This paper proposes a methodology to find optimal rates for a random access scheme to ensure string stability in a platoon of vehicles.
Wireless Mesh networks (WMNs) have been widely used in various industries, including industrial control, environmental monitoring, and military operations. The performance of WMNs may be improved with the help of an e...
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internet of Things (IoT) devices that are purchased from a variety of suppliers & installed in significant amounts are subject to increasing cybersecurity vulnerabilities. Consequently, it has become more crucial ...
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The power transient stability analysis is one of the basis for determining the control strategy of power system security and stability. Considering the influence of power grid topology on the transient stability of po...
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ISBN:
(纸本)9781665489577
The power transient stability analysis is one of the basis for determining the control strategy of power system security and stability. Considering the influence of power grid topology on the transient stability of power system, the transient stability evaluation model is constructed based on the graph attention neural network. The electrical components and their transient operation data are mapped to the graph data with the spatial topology characteristics of power system for model training, so as to improve the topological generalization performance of the model. The marginal contribution of input characteristics to the output of transient power angle stability evaluation model is quantitatively calculated based on Shapley additive explanation (SHAP), so as to improve the interpretability of data-driven method for transient power angle stability evaluation. The effectiveness of the proposed method is verified by the IEEE 39-bus system.
Achieving control of Laser Powder Bed Fusion ( L-PBF) over the quality of the print is the main motivation for finding an optimum set of parameters in the process. Surface roughness is one of the characteristics of th...
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Achieving control of Laser Powder Bed Fusion ( L-PBF) over the quality of the print is the main motivation for finding an optimum set of parameters in the process. Surface roughness is one of the characteristics of the print that impacts the performance of the desired functionality. This research focus is to relate the build angle with the surface roughness on the L-PBF printed specimens and utilize machine learning methods for roughness estimation of geometric features with varying build angles. The EOS M290 L-PBF printer was used to print Inconel-718 coupons using standard process parameters while varying build angles from 20 to 90 degrees at fixed 5-degree intervals. The specimens' surface was analyzed using metrology tools and the data obtained was used for training the machine learning models. Machine learning methods are used to create regression models for estimating the roughness of the specimens using the build angle and location of the sample on the substrate. The findings of this study provide build angle-based predictive estimation of surface roughness of printed L-PBF parts. The machine learning model will help to make reliable decisions on choosing the build angle of a complex part based on the desired surface roughness of its geometric features.
We develop a multi-agent reinforcement learning (MARL) algorithm to minimize the total energy consumption of multiple massive MIMO (multiple-input multiple-output) base stations (BSs) in a multi-cell network while pre...
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ISBN:
(纸本)9798350343205;9798350343199
We develop a multi-agent reinforcement learning (MARL) algorithm to minimize the total energy consumption of multiple massive MIMO (multiple-input multiple-output) base stations (BSs) in a multi-cell network while preserving the overall quality-of-service (QoS) by making decisions on the multi-level advanced sleep modes (ASMs) and antenna switching of these BSs. The problem is modeled as a decentralized partially observable Markov decision process (DEC-POMDP) to enable collaboration between individual BSs, which is necessary to tackle inter-cell interference. A multi-agent proximal policy optimization (MAPPO) algorithm is designed to learn a collaborative BS control policy. To enhance its scalability, a modified version called MAPPO-neighbor policy is further proposed. Simulation results demonstrate that the trained MAPPO agent achieves better performance compared to baseline policies. Specifically, compared to the auto sleep mode 1 (symbol-level sleeping) algorithm, the MAPPO-neighbor policy reduces power consumption by approximately 8.7% during low-traffic hours and improves energy efficiency by approximately 19% during high-traffic hours, respectively.
In China, there are still a lot of small and medium capacity users of distributed heating in addition to the central heating mode. Starting from the goal of carbon peaking and carbon neutrality, distributed clean ener...
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ISBN:
(数字)9798350373479
ISBN:
(纸本)9798350373486
In China, there are still a lot of small and medium capacity users of distributed heating in addition to the central heating mode. Starting from the goal of carbon peaking and carbon neutrality, distributed clean energy should be used to achieve local heating, while distributed photovoltaic heating has uncertainties caused by meteorological factors. Light storage composite method can improve the performance and combined with heating control. It is expected to achieve comprehensive energy efficiency and green energy supply. Based on the rural internet of Things and optical heat storage internet of Things control system, this paper proposes a decentralized and coordinated control method suitable for small and medium capacity optical heat storage network, mainly considering economy, considering heating quality and green and low-carbon benefits. This method uses fuzzy control method and determines membership function according to expert experience and cloud model. The selling and purchasing electric power sequence of the micro-energy network in different periods is regulated to improve the operation economy of the photovoltaic thermal storage micro-energy network.
IoT-Fog system security depends on intrusion detection system (IDS) since the growing number of internet-of-Things (IoT) devices has increased the attack surface for cyber threats. The dynamic nature of cyberattacks o...
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Dynamic adaptive streaming over HTTP (DASH) is the most widespread internet video delivery service system. In DASH, a bitrate is selected dynamically to appropriately share the bandwidth of the server among multiple u...
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ISBN:
(纸本)9781665413329
Dynamic adaptive streaming over HTTP (DASH) is the most widespread internet video delivery service system. In DASH, a bitrate is selected dynamically to appropriately share the bandwidth of the server among multiple users. While most of the existing rate-selection methods have been based on improving quality of service (QoS), quality of experience (QoE) methods that express user satisfaction with the quality of video content have been attracting the attention of service providers and network providers. In addition, some studies show that user preference affects QoE. Therefore, we both propose and demonstrate the effectiveness of a rate-selection method based on game theory that considers user preference for video streaming.
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