Federated learning-based user access strategy and energy consumption optimization in cell-free massive MIMO network by Yuanyuan YAO, Yiqiu LIU, Sai HUANG, Chunyu PAN, Xuehua LI, Xin YUAN

“…To solve the problem that how users choose access points in cell-free massive multiple-input multiple-output (CF-mMIMO) network, a prioritized access strategy for poorer users based on channel coefficient ranking was proposed.First, users were evaluated and ranked for their channel quality and stability after channel sensing, and suitable access points were selected in sequence according to the order of the channel state information.Second, considering issues such as users' energy consumption and data security, a federal learning framework was used to enhance user's data privacy and security.Meanwhile, an alternating optimization variables algorithm based on energy consumption optimization was proposed to optimize the multi-dimensional variables, for the purpose of minimizing the total energy consumption of the system.Simulation results show that compared with the traditional user-centric in massive MIMO, the proposed access strategy can improve the average uplink reachable rate of users by 20%, and the uplink rate of users with poor channels can be double improved; in terms of energy consumption optimization, the total energy consumption can be reduced by much more than 50% after optimization.…”
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A Wide-Band High-Resolution Transmitter for Optical Isolation Amplifier by Chengying Chen, Lixia Bai, Yunrong Zhu, Tiancheng Wu

“…The test results show that in 5 V supply voltage, the input swing of transmitter is 2 V and the effective signal bandwidth is 110 kHz. And the output resolution achieves 11 bit.…”
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Effects and optimization of pilot sequence length on rate in multiuser massive MIMO FDD system by Yi WANG, Pengge MA, Kaizhi HUANG, Chunguo LI, Yongming HUANG, Lyuxi YANG

“…The effect of pilot sequence length on the asymptotic performance of the ergodic rate was investigated for the multiuser massive multiple-input multiple-output (MIMO) frequency division duplexing (FDD) downlink system.Firstly,the analytical expression of the ergodic rate was derived by using the principle of deterministic equivalence,based on which,it was discovered from the analytical results in two-fold that the normalized pilot sequence length (defined as the pilot sequence length divided by the number of BS antennas) tends to zero yet the rate was guaranteed to grow large without limit as long as the BS antenna number continues to increase,the rate saturates to a certain level if the BS antenna number becomes large with fixed pilot sequence length.Moreover,the pilot sequence length was optimized based on the sum-rate maximization within a finite channel coherence time,and a closed-form solution was deduced under a special correlated channel by means of Lambert W function.Simulation results validate the correctness of the theoretical analysis results and verify the effectiveness of the proposed closed-form solution of the optimal pilot sequence length.…”
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Exploratory Methods for the Study of Incomplete and Intersecting Shape Boundaries from Landmark Data by Fathi M. O. Hamed, Robert G. Aykroyd

“…The method successfully identifies the underlying structure and its output could also be used as the basis for further analysis.…”
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Cardiorenal Syndromes and Sepsis by C. Chelazzi, G. Villa, A. R. De Gaudio

“…Treatment includes early and targeted optimization of hemodynamics to reverse systemic hypotension and restore urinary output. In case of persistent renal impairment, renal replacement therapy may be used to remove cytokines and restore renal function.…”
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Study on the Speed Stability of Wheel Drive Mechanism used in Lunar Rover by Xiao Jie, Zeng Lingbin, Zhang Xiaowei, Liu Dianfu, Zou Huaiwu

“…The 3-stage planetary reducer with closed-loop control is adopted in CE-3 lunar rover wheel drive mechanism.Aiming at the problem that the speed stability of drive mechanism does not satisfy the design requirements,the factors affecting the speed stability of planetary reducer are systematically analyzed,and methods and measures minimizing the inequality of load sharing of planetary gear sets are studied carefully.Through troubleshooting and numerical simulations,the causation is uncovered as follows:the first stage sun gear radial runout exceeds the allowed range.Then two solutions are proposed:the first one is to redesign the first stage sun gear into a floating sun gear,the second one is to improve the machining precision of the first stage sun gear.And the second solution is adopted because it is smaller and lighter than the first one.Then much ground simulation tests which are conducted at the room condition,high-temperature vacuum condition and low-temperature vacuum condition demonstrate that the speed stability of drive mechanism satisfies the design requirements.At last,the effectiveness of the proposed method is validated by the telemetry parameters of lunar rover moving on the moon surface.…”
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Compact Unequal Power Divider with Filtering Response by Wei-Qiang Pan, Jin-Xu Xu, Kai Xu Wang, Xiao Lan Zhao

“…The power division ratio is controlled by altering the coupling strength among the resonators. The output ports have the characteristic impedance of 50 Ω and impedance transformers in classical Wilkinson power dividers are not required in this design. …”
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Adaptive Differentiator-Based Predefined-Time Control for Nonlinear Systems Subject to Pure-Feedback Form and Unknown Disturbance by Man Yang, Qiang Zhang, Ke Xu, Ming Chen

“…In this article, by utilizing the predefined-time stability theory, the predefined-time output tracking control problem for perturbed uncertain nonlinear systems with pure-feedback structure is addressed. …”
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Signs of the Times: Medieval Punctuation, Diplomatic Encoding and Rendition by Elisa Cugliana, Gioele Barabucci

“…We also reflect on the separation between transcription and analysis, as well as on the role of the editor when the edition is the output of a semi-automated process.…”
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All-optical pattern matching system of 42 Gbit/s 4-bit BPSK signals and its demonstration for optoelectronic firewall by Qihan ZHANG, Xiaoxue GONG, Rui LI, Xin LI, Shanguo HUANG, Lei GUO

“…To achieve the all-optical pattern matching for optoelectronic firewall which could process high-speed optical signals efficiently, a BPSK all-optical pattern recognition system with the data rate up to 42 Gbit/s was proposed and demonstrated by employing the commercial optical components.First, the input BPSK sequence was converted to a positive and a negative IM signals by adding in-phase and inverse-phase coherent carriers, respectively.Then the converted IM signals were coupled into time delay lines and optical AND logic gates implemented by HNLF to achieve the optical correlation operation.In the end, a high-level optical pulse indicating the pattern matched result was output.The numerical simulation and the experiment results demonstrate that the proposed system can recognize a 4-bit target BPSK sequence from an 8-bit 42 Gbit/s BPSK input sequence, which proves the feasibility of the all-optical pattern matching of BPSK signals and can be applied to high-speed optoelectronic firewall.…”
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A Compact 5G Decoupling MIMO Antenna Based on Split-Ring Resonators by Ziyu Xu, Qisheng Zhang, Linyan Guo

“…A compact planar multiple-input multiple-output (MIMO) antenna array for 5G band is proposed in this paper. …”
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Britten et l’art de la parabole by Gilles Couderc

“…Although quite original in Britten’s output, the parables hark back to older pieces also on religious subjects, composed between his operas. …”
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Bétibé et Akan lagunaires : apports et emprunts, 12-17e siècle (Côte d’Ivoire) by Moïse Antoine DIECKET

“…Résumé : Le peuple éotilé ou bétibé, qui s’installe dès le 12e siècle autour du bassin lagunaire de Côte-d’Ivoire, accueille ses frères Akan à partir du 17e siècle, à cause des incessantes guerres dans l’actuel Ghana, terre originelle des Akan. …”
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Improved Multiobjective Genetic Algorithm for Partitioning Distributed Photovoltaic Clusters: Balancing Spatial Distance and Power Similarity by Yansen Chen, Kai Cheng, Zhuohuan Li, Shixian Pan, Xudong Hu

“…The prediction of power output from photovoltaic generation clusters is crucial for optimizing the dispatch of regional photovoltaic generation. …”
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Familiarity of an environment prevents song suppression in isolated zebra finches. by Anja T Zai, Diana I Rodrigues, Anna E Stepien, Corinna Lorenz, Nicolas Giret, Iris Adam, Richard H R Hahnloser

“…Together, these insights can serve to refine experimental studies and design paradigms maximizing the birds' wellbeing and vocal output.…”
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Simulation Analysis of Cross-axis Magnetic Gear Characteristic by Wei Jie, Huiqing Lan

“…The advantage compared with mechanical gears is that the 90° space interleaving between the output and the input can be achieved by the one-stage transmission. …”
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Out of the Earth (1935) : Le personnalisme d’une « female Lawrence » by Clara Sadoun-Édouard

“…Dès lors, à partir de cette étude de cas, de la présentation du personnalisme au Royaume-Uni et de la réception de la littérature anglaise par Esprit, l’article rend compte des rapports entre personnalisme et littérature au Royaume-Uni et de la focalisation d’une conception littéraire du personnalisme anglais autour de la figure de DH Lawrence.…”
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La construction lombrosienne de l’épilepsie et le débat avec Gabriel Tarde. Crime et / ou folie ? by Alessio Berré

“…Notre étude se concentre plus précisément sur l’apparition de la folie morale et de l’épilepsie dans L’uomo delinquente de Lombroso, ainsi que sur l’interprétation tardienne autour de ces deux notions qui vont progressivement constituer le noyau fondamental de la théorie de Lombroso.D’un coté, nous tenterons de vérifier si l’introduction de ces notions marque une vraie rupture avec la distinction fondamentale entre crime et folie qui caractérisait la première phase du travail lombrosien. …”
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Influence of End Milling Process Variables on Material Removal Rate and Surface Roughness of Direct Metal Laser Sintered Inconel 718 Plate by N. L. Parthasarathi, Dhinakaran Veeman, Duraisami Dhamodharan, Utpal Borah, M. Ravichandran, L. Natrayan, Wubishet Degife Mammo

“…Surface roughness and material removal rate have been considered as output responses. The end milling experiments were conducted using the design of experiments with an L9 orthogonal array (OA) by varying the process variables like feed rate (mm/min), cutting speed (m/min), and depth of cut (mm). …”
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The Role of ESG (Environmental, Social, Governance) on Dividends and Firm Value: The Moderation Effect of Audit Quality by Clarissa Dominique Effendi Handajani, Werner R. Murhadi

“…It takes time for ESG investments to influence company performance, which has an impact on high dividend payout ratios and firm value.…”
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