In relation to large industrially significant systems (using the example of nuclear power plants (NPP)), the ways of developing the architecture and functionality of cloud systems are considered. The development ways ...
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Satellite Edge computing has been recently introduced to deploy innovative computational services in space using Low Earth Orbit (LEO) satellite constellations as a distributed computational platform. Running a distri...
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ISBN:
(纸本)9798350366495;9798350366488
Satellite Edge computing has been recently introduced to deploy innovative computational services in space using Low Earth Orbit (LEO) satellite constellations as a distributed computational platform. Running a distributedcomputing platform in space introduces new challenges to traditional problems like computation offloading, task scheduling, mobility management, fault detection, and recovery. This research focuses on the problem of task scheduling, proposing a system model that accounts for the dynamics of the Satellite Edge computing environment and a formulation of the scheduling problem as an optimization problem that minimizes the average task response time under constraints on available resources and task completion deadlines. Then, we propose a decentralized algorithm that estimates the task response time and computes a scheduling solution in a fixed time, which depends only on the number of Inter Satellite Links a satellite has (typically four). Finally, we estimate and compare the overhead of the decentralized versus the decentralized solutions, showing the advantages of the proposed approach. Simulation experiments allow us to compare the performance of the decentralized approach with the performance of baseline decentralized and centralized solutions. Results show that, in all scenarios considered, the proposed decentralized algorithm performs better than the baseline centralized and decentralized solutions and is more scalable and highly available.
Serverless Edge computing is growing in popularity, and while commercial providers are starting to offer edgeoriented products, much research is still being done on orchestrating functions (e.g., autoscaling). These a...
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ISBN:
(纸本)9798350368543;9798350368536
Serverless Edge computing is growing in popularity, and while commercial providers are starting to offer edgeoriented products, much research is still being done on orchestrating functions (e.g., autoscaling). These approaches range from threshold- to AI-based strategies and support various Service Level Objectives (SLOs), such as Round-Trip-Time (RTT) and resource usage. However, the Quality of Service (QoS) continuously deteriorates due to the dynamic edge-cloud continuum and static parameterization of orchestration strategy parameters. Platforms must adapt the orchestration parameters during runtime to counteract this drift that causes SLO violations. To this end, we introduce the Orchestration Parameter Optimization Problem (OPOP), which aims to find parameters for orchestration strategies to minimize SLO violations. We propose a novel selfadaptive Simulation-based Scaling (SimuScale) approach that uses co-simulation to solve OPOP for autoscalers during runtime. SimuScale uses live monitoring data to feed the simulation and perform parameter optimization. Our Proof of Concept is integrated with Kubernetes and evaluated on a real-world edge-cloud testbed. While this work focuses on a threshold-based autoscaler, it can be extended to optimize other orchestration components (e.g., schedulers). Our experimental results show that SimuScale finds parameters that decrease RTT SLO violations between 15% and 40%. SimuScale also can reduce resource usage by 29.87% while maintaining the target 95th RTT percentile. Moreover, it can reduce variance caused by different request patterns, making orchestration strategies more resilient in realistic scenarios.
Traffic congestion is a pervasive problem causing severe environmental and economic issues. In recent years, traffic signal control using reinforcement learning (RL) has come a long way. Most existing studies focus on...
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ISBN:
(纸本)9798331507879;9798331507862
Traffic congestion is a pervasive problem causing severe environmental and economic issues. In recent years, traffic signal control using reinforcement learning (RL) has come a long way. Most existing studies focus on using distributed agents with data exchange among neighbors, which, however, increases network complexity and usage and still suffers from the lack of broader coordination. Meanwhile, the attention mechanism has achieved tremendous success, and advances in vehicle-to-infrastructure (V2I) communications have enabled real-time collections of granular data. However, integrating these technologies into traffic signal control remains under-explored. Therefore, we present GreenLight, a forward-thinking and eco-friendly traffic signal control framework that can be applied to V2I-equipped fog computing environments. For a large urban area, traffic signals are divided into clusters, each coordinated by a fog node with an RL agent. Intra-cluster indexed self-attention is applied to extract context-aware features that the fog-residing RL agent utilizes to determine the proper signal control command. Results of simulation experiments using both synthetic and real-world scenarios show that the presented framework yields lower waiting time, emissions, and fuel consumption compared to baseline methods, indicating its potential for next-generation transportation systems.
This study evaluates the numerical performance of first and second-order nonlinear dynamic semiconductor optical amplifier (SOA) models, including the distributed traveling-wave (TW) and lumped models. We find that wh...
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In this paper, the joint problem of agents, e.g., police officers, firefighters, etc., to Unmanned Aerial Vehicles (UAVs) association and optimal partial task offloading is addressed based on the principles of reinfor...
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ISBN:
(纸本)9781665495127
In this paper, the joint problem of agents, e.g., police officers, firefighters, etc., to Unmanned Aerial Vehicles (UAVs) association and optimal partial task offloading is addressed based on the principles of reinforcement learning and contract theory, respectively, in public safety scenarios. A two -layers approach is followed. At the first layer, the agents act as learning automata in order to learn their most beneficial UAV selection to optimize their long-term reward in terms of processing their offloaded data, while respecting their delay constraints and tolerance stemming from their requested computing service and the public safety scenario that they serve. At the second layer, a contracttheoretic model is proposed to determine the agents' optimal amount of offloaded data to the selected UAV and the UAV's optimal portion of allocated computing capacity to each agent's computing tasks, while considering the urgency of the agents' requested service. A detailed set of numerical and comparative simulation results demonstrates the drawbacks and benefits of the proposed framework under rea-life public safety scenarios.
Nowadays, networks are increasingly reliant on software frameworks and virtualization. To obtain relevant pre-dictions of the behavior of their protocols, network emulation tools play a crucial role. However, as netwo...
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The computing continuum is growing because multiple devices are added daily. Edge devices play a key role in this because computation is decentralized or distributed. Edge computing is advanced by using AI/ML algorith...
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ISBN:
(纸本)9798350304831
The computing continuum is growing because multiple devices are added daily. Edge devices play a key role in this because computation is decentralized or distributed. Edge computing is advanced by using AI/ML algorithms to become more intelligent. Besides, Edge data protocols are useful for transmitting or receiving data between devices. Since, computation efficiency is possible when the data is received at the Edge timely, and it is possible only when the data protocols are efficient, reliable and fast. Most edge data protocols are defined with static set of rules and their primary purpose is to provide standardized and reliable data communications. Edge devices need autonomous or dynamic protocols that enable interoperability, autonomous decision making, scalability, and adaptability. This paper examines the limitations of popular data protocols used in edge networks, the need for intelligent data protocols, and their implications. We also explore possible ways to simplify learning for edge devices and discuss how intelligent data protocols can mitigate challenges such as congestion, message filtering, message expiration, prioritization, and resource handling.
In the context of Federated Learning, the vulnerability to backdoor attacks poses a significant threat to the integrity and reliability of distributed learning systems. This research introduces a novel defense framewo...
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The distributed dynamic network is vulnerable to scanning attacks due to the openness of wireless channels. Traditional defense systems tend to be passive and exhibit delayed responses. A moving target defense approac...
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