The automation industry in the construction sector has been a very important pillar for the planning and constant control of fibers to improve the mechanical properties of earth blocks. The present work implements aut...
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ISBN:
(纸本)9798350332865
The automation industry in the construction sector has been a very important pillar for the planning and constant control of fibers to improve the mechanical properties of earth blocks. The present work implements automation as a way to obtain fiber from Agave americana L, thus achieving improvements in the mechanical properties of the soil blocks using fiber dosages of 0%, 0.25%, 0.5%, 0.75% and 1%, these were expressed with respect to the total weight of the sample. On the other hand, for the Agave americana L. fiber process, LadVIEW software was used to simulate the automation, where an HMI screen is located, this uses a shredding machine to obtain 2 products, either fiber or juice of Agave Americana L. This final product is transported by conveyor belts to their respective warehouses. Finally, the optimal dosages in the improvement of the mechanical properties were given by using 0.25% of Agave fiber increasing in 13.39% (2.54MPa) the compressive strength, on the other hand, using 1% of Agave fiber the tensile strength increased in 39.13% (0.32MPa) and 0.5% of Agave fiber increased in 14.26% (1.44MPa) the flexural strength.
Distribution network stability protection wireless bearer passes through multiple wireless transmission and core network forwarding, resulting in many delay accumulation links, large delay control difficulty and high ...
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ISBN:
(纸本)9798350389913;9798350389906
Distribution network stability protection wireless bearer passes through multiple wireless transmission and core network forwarding, resulting in many delay accumulation links, large delay control difficulty and high communication packet loss rate. In view of these problems, the dual-path transmission technology is put forward, and the key technology research of 5G low delay, low jitter technology and 5G carrying control business is carried out, so as to form the core technology of 5G carrying power control business. Developed a high-precision timing gateway based on real-time operating system and 5G clock synchronization, and tested parameters such as delay, jitter and packet loss rate in the laboratory to realize 5G wireless dual-path transmission (dual-path zero-self-healing wireless network). The terminal reduces the packet loss rate and delay, and conducts technical verification for the large-scale application of the distribution network stability protection business.
In view of the great significance of the Internet of Things technology to the construction of security management and control in chemical parks, this paper designs a network transmission technology of security managem...
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With the significant increase of social aging trend, the defecation and control ability of the elderly has become an important issue in the field of elderly rehabilitation. This paper designs a training robot system b...
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control design for robotic systems is complex and often requires solving an optimization to follow a trajectory accurately. Online optimization approaches like Model Predictive control (MPC) have been shown to achieve...
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ISBN:
(纸本)9798350323658
control design for robotic systems is complex and often requires solving an optimization to follow a trajectory accurately. Online optimization approaches like Model Predictive control (MPC) have been shown to achieve great tracking performance, but require high computing power. Conversely, learning-based offline optimization approaches, such as Reinforcement Learning (RL), allow fast and efficient execution on the robot but hardly match the accuracy of MPC in trajectory tracking tasks. In systems with limited compute, such as aerial vehicles, an accurate controller that is efficient at execution time is imperative. We propose an Analytic Policy Gradient (APG) method to tackle this problem. APG exploits the availability of differentiable simulators by training a controller offline with gradient descent on the tracking error. We address training instabilities that frequently occur with APG through curriculum learning and experiment on a widely used controls benchmark, the CartPole, and two common aerial robots, a quadrotor and a fixed-wing drone. Our proposed method outperforms both model-based and model-free RL methods in terms of tracking error. Concurrently, it achieves similar performance to MPC while requiring more than an order of magnitude less computation time. Our work provides insights into the potential of APG as a promising control method for robotics. To facilitate the exploration of APG, we open-source our code and make it available at ***/lis-epfl/apg_trajectory_tracking.
Vehicular communication is a critical technology in Intelligent Transportation Systems (ITS) that aims to improve transportation safety and efficiency. However, traditional radio-based systems, such as Cellular V2X (C...
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ISBN:
(纸本)9798350328127
Vehicular communication is a critical technology in Intelligent Transportation Systems (ITS) that aims to improve transportation safety and efficiency. However, traditional radio-based systems, such as Cellular V2X (C-V2X) and Dedicated Short Range communication (DSRC), may suffer from performance degradation in dense traffic scenarios. To address this issue, Line of Sight (LoS) technologies such as Visible Light communication (VLC) are being explored as complementary technologies to RF. VLC utilizes LEDs on vehicles to exchange information with preceding and subsequent vehicles, allowing ITS to create a safer and less congested transportation system. Recent studies have shown that combining DSRC and VLC can minimize the performance degradation experienced by RF communication technologies. This paper highlights the need to combine RF and LoS technologies to improve the stability and reliability of V2V communication. It discusses various LoS and RF technologies and presents combinations that can be used for communication. Finally, a hybrid strategy that combines the best properties of individual technologies is proposed, demonstrating the feasibility of such a solution.
Mobile edge computing (MEC) is gaining popularity, as it can improve mobile application performance by offloading local computation to edge servers. However, due to the openness of wireless communication, the confiden...
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ISBN:
(纸本)9798350378412
Mobile edge computing (MEC) is gaining popularity, as it can improve mobile application performance by offloading local computation to edge servers. However, due to the openness of wireless communication, the confidentiality of MEC data transmission, especially the uploading, is endangered by eavesdropping attacks, whose risks have not been thoroughly depicted, evaluated and managed in the literature. In this paper, we investigate the application of friendly jamming (FJ) from base station (BS) and a nearby user to improve physical layer security (PLS) for MEC services. Further, we propose an adjustable multilevel assessment framework for user to evaluate confidentiality risks, and model the impact of its subjective biases under uncertainty based on Prospect Theory (PT). Then, we formulate an operator's net income maximization problem by jointly considering effective data rate, user satisfaction, antenna usage, upload/FJ power consumption and FJ incentive cost. To solve the highly complex problem, we propose a two-stage control scheme, which first optimizes the secrecy capacity and then maximizes the effective data rate that achieves user satisfaction. By simulation, we evaluate the secrecy performance of the scheme under various conditions, and compare it with the one based on expected utility theory (EUT).
For those who are deaf or hard of hearing, sign language is essential as their main form of communication. using ease, sign language gestures may be translated into written or spoken words in real time using the Sign ...
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This research presents a novel five-level and seven-level inverter topology for improved power quality in multilevel inverter (MLI) systems. The proposed design employs a bidirectional switch and an H-bridge cell, red...
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The control of oven temperature is a lagging, nonlinear system. To address the problem of poor results of traditional PID control of oven temperature, the mathematical model of oven temperature is derived by testing t...
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