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| 1 | Tensor-Based Low-Complexity Channel Estimation for mmWave Massive MIMO-OTFS Systems显示文摘Orthogonal time frequency space(OTFS)modulation,collaborated with millimeter-wave(mmWave)massive multiple-input-multiple-output(MIMO),is a promising technology for next generation wireless communications in high mobility scenarios.However,one of the main challenges for mmWave massive MIMO-OTFS systems is the enormous computational complexity of channel estimation incurred by the huge OTFS symbol size and the large number of antennas.To address this issue,in this paper,a tensor-based orthogonal matching pursuit(OMP)channel estimation algorithm is proposed by exploiting the channel sparsity in the delay-Doppler-angle domain.In particular,we firstly propose a novel pilot design for the OTFS symbol structure in the frequency-time domain.Then,based on the proposed pilot structure,we formulate the channel estimation as a sparse signal recovery problem,and the tensor decomposition and parallel support detection are introduced into the tensor-based OMP algorithm to reduce the signal processing dimension significantly.Numerical simulations are performed to verify the superiority and the robustness of the proposed tensor-based OMP algorithm. | Xianda Wu Shaodan Ma Xi Yang | 2020 | Journal of Communications and Information Networks2020，5，3： | 5 |
| 2 | Serological Investigation of Laboratory-Confirmed and Suspected Ebola Virus Disease Patients During the Late Phase of the Ebola Outbreak in Sierra Leone显示文摘This study aimed to investigate the serological characteristics of Ebola virus(EBOV) infection during the late phase of the Ebola outbreak in Sierra Leone. In total, 877 blood samples from 694 suspected Ebola virus disease(EVD) cases assessed from March to December 2015, were analyzed via real-time reverse transcription polymerase chain reaction(RT-PCR) for viral RNA and enzyme-linked immunosorbent assay(ELISA) and Luminex to detect antibodies against EBOV. Viral load and EBOV-specific IgM/IgG titers displayed a declining trend during March to December 2015. Viral RNA load decreased rapidly at earlier stages after disease onset, while EBOV-specific IgM and IgG still persisted in 58.1%(18/31) and 93.5%(29/31) of the confirmed EVD patients and in 3.8%(25/663) and 17.8%(118/663) of the RNA-negative suspected patients in the later phase, respectively. Dynamic analysis of longitudinally collected samples from eight EVD patients revealed typically reversed trends of declining viral load and increasing IgM and/or IgG titers in response to the EBOV infection.The present results indicate that certain populations of Sierra Leone developed immunity to an EBOV infection in the late phase of the outbreak, providing novel insights into the risk assessment of EBOV infections among human populations. | Yang Liu YuLan Sun Wei Wu AQian Li XianDa Yang Shuo Zhang Chuan Li QiuDong Su ShaoJian Cai DaPeng Sun HaiYang Hu Zhe Zhang XiuXu Yang Idrissa Kamara Sheku Koroma Gerald Bangura Alie Tia Abdul Kamara Matt Lebby Brima Kargbo Jiandong Li Shiwen Wang XiaoPing Dong YueLong Shu WenBo Xu George F. Gao GuiZhen Wu DeXin Li William J. Liu MiFang Liang | 2018 | Virologica Sinica2018，33，4： | 2 |
| 3 | Evaluation of reservoir connectivity using whole-oil gas chromatographic fingerprint technology: A case study from the Es_3~3 reservoir in the Nanpu Sag, China显示文摘In this study, whole-oil gas chromatographic fingerprint analyses were performed on oils from the Es33 reservoir in the Liubei area of the Nanpu Sag. The gas chromatographic peaks of cyclic and branched alkanes with relatively high resolution from nC10 to nC25 were selected to establish a database of whole-oil gas chromatographic peak height ratio fingerprints. Reservoir fluid connectivity was identified by using clustering analysis. This method can reflect the gas chromatography fingerprint information accurately and entirely, and avoid the one-sidedness of the star diagram method which only selects several fixed gas chromatographic peaks. | Xu Yaohui Shen Xianda Chen Nengxue Yang Cuimin WangQiaoli | 2012 | Petroleum Science2012，9，3： | 1 |
| 4 | A fast maximum likelihood sequence decoding method for multicarrier DS-CDMA using frequency spread coding 显示文摘 | Yang Heng Zhang Xianda | 2004 | IEEE Trans Wireless Communications2004，3，3： | 1 |
| 5 | Optimal MAC based cooperative spectrum sensing in cognitive radio networks显示文摘This paper considers a cognitive radio (CR) system in non-ideal fading wireless channels and pro-poses cooperative spectrum sensing schemes based on coherent multiple access channels (MAC),serving as an alternative way to improve the cooperative spectrum sensing performance and provide space diversity for spec-trum sensing.Sufficient statistics are transmitted using a common channel from the secondary users (SUs) to a fusion center (FC) where the global decision is obtained.The optimal scaling factors of the proposed schemes are obtained by maximizing the detection probability under a target false alarm probability and a transmit power constraint.Because the proposed optimal MAC scheme has high computational complexity,a sub-optimal solu-tion based on maximization of the deflection coefficient (DC) is also proposed.Simulation results show that the proposed algorithms can significantly improve the spectrum sensing performance and approach the detection baseline. | CHEN Zhong ZHANG XianDa YANG LanJuan | 2012 | Science China(Information Sciences)2012，55，6： | 1 |
| 6 | Implicit Heaviside filter with high continuity based on suitably graded THB splines显示文摘The variable density topology optimization(TO)method has been applied to various engineering fields because it can effectively and efficiently generate the conceptual design for engineering structures.However,it suffers from the problem of low continuity resulting from the discreteness of both design variables and explicit Heaviside filter.In this paper,an implicit Heaviside filter with high continuity is introduced to generate black and white designs for TO where the design space is parameterized by suitably graded truncated hierarchical B-splines(THB).In this approach,the fixed analysis mesh of isogeometric analysis is decoupled from the design mesh,whose adaptivity is implemented by truncated hierarchical B-spline subjected to an admissible requirement.Through the intrinsic local support and high continuity of THB basis,an implicit adaptively adjusted Heaviside filter is obtained to remove the checkboard patterns and generate black and white designs.Threefold advantages are attained in the proposed filter:a)The connection between analysis mesh and adaptive design mesh is easily established compared with the traditional adaptive TO method using nodal density;b)the efficiency in updating design variables is remarkably improved than the traditional implicit sensitivity filter based on B-splines under successive global refinement;and c)the generated black and white designs are preliminarily compatible with current commercial computer aided design system.Several numerical examples are used to verify the effectiveness of the proposed implicit Heaviside filter in compliance and compliant mechanism as well as heat conduction TO problems. | Aodi YANG Xianda XIE Nianmeng LUO Jie ZHANG Ning JIANG Shuting WANG | 2022 | Frontiers of Mechanical Engineering2022，17，1： | 0 |
| 7 | The Regulatory Effect of Braided Silk Fiber Skeletons with Differential Porosities on In Vivo Vascular Tissue Regeneration and Long-Term Patency显示文摘The development of small-diameter vascular grafts that can meet the long-term patency required for implementation in clinical practice presents a key challenge to the research field.Although techniques such as the braiding of scaffolds can offer a tunable platform for fabricating vascular grafts,the effects of braided silk fiber skeletons on the porosity,remodeling,and patency in vivo have not been thoroughly investigated. | Xili Ding Weirong Zhang Peng Xu Wentao Feng Xiaokai Tang Xianda Yang Lizhen Wang Linhao Li Yan Huang Jing Ji Diansheng Chen Haifeng Liu Yubo Fan | 2023 | Research2023，，2： | 0 |
| 8 | Effects of Dietary Picria felterrae Lour Extracts on Serum Biochemical Indexes and Immune Function of Guangxi Partridge Chickens显示文摘[Objective] This trial was to investigate the effect of dietary Picria felterrae Lour extracts on serum biochemical indexes and immune function of Guangxi Partridge chickens. [Method] Totally 500 individuals of 1-day-old Guangxi Partridge chickens were randomly divided into five groups, five replicates each group and 20 chicks each replicate. Groups A, B and C were treatment groups supplemented with 0.70%, 0.35% and0.175% P. felterrae extracts in the basal diet, respectively; group D was a medical control group supplemented with 0.01% colistin sulfate premix in the basal diet; and group E was a control group with basal diet. Serum samples were collected from 10 chickens in each group at 21, 35 and 49 days of age, to analyze the biochemical and immune indexes. [Result] It had no significant impact on serum TP and GLU contents of chickens by adding different levels of P. felterrae extracts in the basal diet(P >0.05). However, at 21 and 35 days of age, the TBILI content of chickens in groups A, B and C were extremely lower or significantly lower than that in group E( P<0.01; P<0.05). At 35 days of age, the serum AKP activities in groups A, B and C were extremely higher than that in group E(P<0.01), and the serum GOT activities at 21 and 35 days of age in group C were significantly higher than that in group E(P<0.05). At 49 days of age, the serum Ig G content in groups A, B and C and the IL-2 content in group B and group C were significantly lower or extremely lower than that in group E( P<0.05; P<0.01); the T-AOC content in group B was significantly higher than that in group E(P<0.05); the GSH content in groups A, B and C were significantly higher than that in group E( P<0.05). Adding different levels of P. felterrae extracts in the diet significantly decreased the TBILI content, reduced the Ig G, IL-2 and IL-6 contents, and improved the AKP and GOT activities and the T-AOC and GSH contents of Guangxi Partridge chicken. [Conclusion] Adding 0.35% P. felterrae extracts in the basal diet received the best effort. | Yang Cui Bi Xianda Hu Tingjun Yang Jian Huang Hongye Tan Honglian Peng Jianbo Luo Wenjuan Li Lu Li Chunjie Liao Yuying Yang Jiahuang | 2018 | Animal Husbandry and Feed Science2018，10，1： | 0 |
| 9 | Massively efficient filter for topology optimization based on the splitting of tensor product structure显示文摘In this work,we put forward a massively efficient filter for topology optimization(TO)utilizing the splitting of tensor product structure.With the aid of splitting technique,the traditional weight matrices of B-splines and non-uniform rational B-spline implicit filters are decomposed equivalently into two or three submatrices,by which the sensitivity analysis is reformulated for the nodal design variables without altering the optimization process.Afterwards,an explicit sensitivity filter,which is decomposed by the splitting pipeline as that applied to implicit filter,is established in terms of the tensor product of the axial distances between adjacent element centroids,and the corresponding sensitivity analysis is derived for elemental design variables.According to the numerical results,the average updating time for the design variables is accelerated by two-order-of-magnitude for the decomposed filter compared with the traditional filter.In addition,the memory burden and computing time of the weight matrix are decreased by six-and three-order-of-magnitude for the decomposed filter.Therefore,the proposed filter is massively improved by the splitting of tensor product structure and delivers a much more efficient way of solving TO problems in the frameworks of isogeometric analysis and finite element analysis. | Aodi YANG Shuting WANG Nianmeng LUO Tifan XIONG Xianda XIE | 2022 | Frontiers of Mechanical Engineering2022，17，4： | 0 |
| 10 | Explicit Isogeometric Topology Optimization Method with Suitably Graded Truncated Hierarchical B-Spline显示文摘This work puts forward an explicit isogeometric topology optimization(ITO)method using moving morphable components(MMC),which takes the suitably graded truncated hierarchical B-Spline based isogeometric analysis as the solver of physical unknown(SGTHB-ITO-MMC).By applying properly basis graded constraints to the hierarchical mesh of truncated hierarchical B-splines(THB),the convergence and robustness of the SGTHB-ITOMMC are simultaneously improved and the tiny holes occurred in optimized structure are eliminated,due to the improved accuracy around the explicit structural boundaries.Moreover,an efficient computational method is developed for the topological description functions(TDF)ofMMC under the admissible hierarchicalmesh,which consists of reducing the dimensionality strategy for design space and the locally computing strategy for hierarchical mesh.We apply the above SGTHB-ITO-MMC with improved efficiency to a series of 2D and 3Dcompliance design problems.The numerical results show that the proposed SGTHB-ITO-MMC method outperforms the traditional THB-ITO-MMCmethod in terms of convergence rate and efficiency.Therefore,the proposed SGTHB-ITO-MMC is an effective way of solving topology optimization(TO)problems. | Haoran Zhu Xinhao Gao Aodi Yang Shuting Wang Xianda Xie Tifan Xiong | 2023 | Computer Modeling in Engineering & Sciences2023，，5： | 0 |
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