The surge in smartphone usage has significantly increased SMS traffic and, consequently, SMS spam, posing risks such as phishing, financial losses, and privacy breaches. Traditional rule-based and blacklist methods fa...
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In order to make the multi-rotor UAV more efficient to complete the contact operations such as picking, obstacle cleaning, grasping and inspired by the skeleton structure and motion law of the eagle's leg, this pa...
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Eye defects of visually impaired people bring great inconvenience to daily lives. With the rapid development of computers and artificial intelligence, some assistance tools and wearable devices have provided convenien...
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For millimeter-wave (mmWave) non-orthogonal multiple access (NOMA) communication systems, we propose an innovative near-field (NF) transmission framework based on dynamic metasurface antenna (DMA) technology. In this ...
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For millimeter-wave (mmWave) non-orthogonal multiple access (NOMA) communication systems, we propose an innovative near-field (NF) transmission framework based on dynamic metasurface antenna (DMA) technology. In this framework, a base station (BS) utilizes the DMA hybrid beamforming technology combined with the NOMA principle to maximize communication efficiency between near-field users (NUs) and far-field users (FUs). In conventional communication systems, obtaining channel state information (CSI) requires substantial pilot signals, significantly reducing system communication efficiency. We propose a beamforming design scheme based on position information to address with this challenge. This scheme does not depend on pilot signals but indirectly obtains CSI by analyzing the geometric relationship between user position information and channel models. However, in practical applications, the accuracy of position information is challenging to guarantee and may contain errors. We propose a robust beamforming design strategy based on the worst-case scenario to tackle this issue. Facing with the multivariable coupled non-convex problems, we employ a dual-loop iterative joint optimization algorithm to update beamforming using block coordinate descent (BCD) and derive the optimal power allocation (PA) expression. We analyze its convergence and complexity to verify the proposed algorithm’s performance and robustness thoroughly. We validate the theoretical derivation of the CSI error bound through simulation experiments. Numerical results show that our proposed scheme performs better than traditional beamforming schemes. Additionally, the transmission framework exhibits strong robustness to NU and FU position errors, laying a solid foundation for the practical application of mmWave NOMA communication systems. The NF transmission framework for mmWave NOMA communication systems based on DMA technology proposed in this work shows significant advantages in improving communication
Visible and infrared image fusion is one of the most crucial tasks in the field of image fusion, aiming to generate fused images with clear structural information and high-quality texture features for high-level visio...
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In the online social networks (OSNs) and social Internet of Things (SIOT), communities of interest (CoI) are often used to facilitate information sharing among user devices. However, the risk of information leaks acro...
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Significance testing aims to determine whether a proposition about the population distribution is the truth or not given observations. However, traditional significance testing often needs to derive the distribution o...
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Multi-rotor unmanned aerial vehicles (UAVs) have been widely employed in various sensing tasks, e.g., environmental monitoring and disaster rescuing, many of which often require full coverage of terrestrial regions by...
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We address the problem of learning new classes for semantic segmentation models from few examples, which is challenging because of the following two reasons. Firstly, it is difficult to learn from limited novel data t...
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Oxygen is essential for most life *** oxygen supply can disrupt homeostasis and compromise survival,and hypoxia-induced cardiovascular failure is fatal in many animals,including ***,certain species have adapted and ev...
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Oxygen is essential for most life *** oxygen supply can disrupt homeostasis and compromise survival,and hypoxia-induced cardiovascular failure is fatal in many animals,including ***,certain species have adapted and evolved to cope with hypoxic environments and are therefore good models for studying the regulatory mechanisms underlying responses to ***,we explored the physiological and molecular responses of the cardiovascular system in two closely related hypoxiaadapted species with different life histories,namely,Qinghai voles(Neodon fuscus)and Brandt’s voles(Lasiopodomys brandtii),under hypoxic(10%O_(2) for 48 h)and normoxic(20.9%O_(2) for 48 h)*** mice(Mus musculus)were used for *** voles live in plateau areas under hypoxic conditions,whereas Brandt’s voles only experience periodic *** and hematological analyses indicated a strong tolerance to hypoxia in both species,but significant cardiac tissue damage and increased blood circulation resistance in mice exposed to *** transcriptome analysis revealed enhanced oxygen transport efficiency as a coping mechanism against hypoxia in both *** and ***,but with some ***,*** showed upregulated expression of genes related to accelerated cardiac contraction and angiogenesis,whereas *** showed significant up-regulation of erythropoiesis-related *** upregulation of hemoglobin synthesis-related genes was observed in both *** addition,differences in cardiometabolic strategies against hypoxia were observed in the ***,*** relied on adenosine triphosphate(ATP)generation via fatty acid oxidation,whereas *** shifted energy production to glucose oxidation under hypoxic conditions and *** employed a conservative strategy involving down-regulation of fatty acid and glucose oxidation and a bradycardia *** conclusion,the cardiovascular sys
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