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Low Complexity Hybrid Precoding in Millimeter Wave Massive MIMO Systems
Tongtong Cheng,Yigang He,Yuting Wu,Shuguang Ning,Yongbo Sui,Yuan Huang 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.4
As a preprocessing operation of transmitter antennas, the hybrid precoding is restricted by the limited computing resources of the transmitter. Therefore, this paper proposes a novel hybrid precoding that guarantees the communication efficiency with low complexity and a fast computational speed. First, the analog and digital precoding matrix is derived from the maximum eigenvectors of the channel matrix in the sub-connected architecture to maximize the communication rate. Second, the extended power iteration (EPI) is utilized to obtain the maximum eigenvalues and their eigenvectors of the channel matrix, which reduces the computational complexity caused by the singular value decomposition (SVD). Third, the Aitken acceleration method is utilized to further improve the convergence rate of the EPI algorithm. Finally, the hybrid precoding based on the EPI method and the Aitken acceleration algorithm is evaluated in millimeter-wave (mmWave) massive multiple-input and multiple-output (MIMO) systems. The experimental results show that the proposed method can reduce the computational complexity with the high performance in mmWave massive MIMO systems. The method has the wide application prospect in future wireless communication systems.
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Interactions of tea catechins with intestinal microbiota and their implication for human health
Tongtong Guo,Dan Song,Lu Cheng,Xin Zhang 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.6
Tea catechins have attracted strong interests inpharmacological field for their extensive biological activities;however, their bioavailability in vivo is relativelylow. Recent studies have shown tea catechins can modulatethe composition of intestinal microbiota and help toimprove hosts’ health. Meanwhile, the gut flora plays acrucial role in regulating the production of the metabolitesof tea catechins and their biological activity. Although theactivities of tea catechins to promote intestinal microecologyhave been extensively studied, little is knownabout the two-way phenol-microbial interactions. Thisreview focuses on the modulatory effect of tea catechins onintestinal microbiota as well as the microbial degradationof tea catechins and the metabolites formed. Finally, thepotential effects of tea catechins on chronic intestinalinflammation are emphasized.
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A Theoretical Calculation Model of H-Section Steel Members for Biaxial Bending Moments
Wang Tongtong,Cheng Xin,Du Huibo 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.1
To investigate the development mechanism of sectional plastic stress and biaxial bending moments of H-section steel members prior to local buckling subjected to monotonic and cyclic loading, extensive parametric analysis models were established in ABAQUS. These models explicitly accounted for diff erent axial force ratios, plate width-thickness ratios under diff erent loading angles, verifying the applicability against existing experimental data. Based on the results of fi nite element analysis, the eff ects of various factors on the development of normal stresses in the cross-section were thoroughly investigated. A semi-empirical semi-theoretical calculation model was established to address biaxial loading in H-section steel members, considering bidirectional displacement, the form of normal stress distribution, and the relationship between the biaxial bending moments. By comparing the model with fi nite element results, it was observed that the model eff ectively predicted the progression of biaxial bending moments development subjected to biaxial loading in H-section steel members. This model provides a more convenient design approach for considering the partial plastic development of the cross-section in bidirectional fl exural design.
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