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Sound Field Reproduction of Focused Virtual Sources with Symmetry Sigmoid Regularization Function

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Chinese Journal of electronics 2018年第4期27卷 835-844页

作者： JIA Maoshen WANG Wenbei SUN Jundai BAO Changchun faculty of Information technology Beijing University of Technology

Reproduction of focused sound sources is a fundamental problem in acoustic signal processing. Based on the cylindrical harmonic expansion of higher order Ambisonics(HOA), a novel method for focused sound source reproduction is proposed. To restrict the near-field distortion caused by higher order harmonic components of focused sound sources, a Symmetry sigmoid regularization function(SSRF) is designed, which exhibits a more suitable attenuation characteristic. By using SSRF, we first give the generalized cylindrical harmonic expansion of focused sound sources. The concept of continuous loudspeaker is utilized over a circular array to generate the discrete loudspeaker driving function. Based on the wideband error analysis, the match relationship between the SSRF and the variance pair(i.e., the operating frequency and the expansion order) is established. Objective evaluation results show that the near-field distortion is eliminated significantly by the proposed method. The reproduction errors of interior/exterior sound field are evidently lower than the state-of-the-art techniques. The subjective evaluations also confirm that the proposed approach is able to achieve higher reproduction quality compared to the referenced methods.

关键词： Focused sound source reproduction higher order ambisonics near-field distortion Symmetry sigmoid regularization function(SSRF)

Normal and Superconducting Properties of La3Ni2O7

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Chinese Physics Letters 2024年第7期41卷 145-156页

作者：王猛闻海虎吴涛姚道新向涛 Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of PhysicsSun Yat-Sen University National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Institute of Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

This review provides a comprehensive overview of current research on the structural,electronic,and magnetic characteristics of the recently discovered high-temperature superconductor La3Ni2O7under high *** present the experimental results for synthesizing and characterizing this material,derived from measurements of transport,thermodynamics,and various spectroscopic techniques,and discuss their physical implications.

关键词： Nickel compounds

Sufficient and necessary conditions for global stability of genetic regulator networks with time delays

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Science China(Information Sciences) 2016年第1期59卷 175-187页

作者： Guopeng ZHOU Jinhua HUANG Fengxia TIAN Xiaoxin LIAO School of Electrical and electronic Engineering Huazhong University of Science and Technology Institute of Engineering and technology Hubei University of Science and Technology Department of Electric and electronic Engineering Wuhan Institute of Shipbuilding Technology College of Automation Huazhong University of Science and Technology

This paper is concerned with the global stability of the nonlinear model for genetic regulator networks(GRNs) with time delays. Four new sufficient and necessary conditions for global asymptotic stability and global exponential stability of the equilibrium point of GRNs are derived. Specifically, using comparing theorem and Dini derivation method, three weak sufficient conditions for global stability of GRNs with constant time delays are proposed. Finally, a general GRN model is used to illustrate the effectiveness of the proposed theoretical results. Compared with the previous results, some sufficient and necessary conditions for Lyapunov stability of GRNs are proposed, which are not seen before.

关键词： genetic regulator networks time delay global asymptotic stable global exponential stable comparing theorem Dini derivative

SBFT:A BFT Consensus Mechanism Based on DQN Algorithm for Industrial Internet of Thing

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中国通信:英文版 2023年第10期20卷 185-199页

作者： Ningjie Gao Ru Huo Shuo Wang Jiang Liu Tao Huang Yunjie Liu State Key Laboratory of Networking and Switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China faculty of Information technology Beijing University of TechnologyBeijing 100124China Future Network Research Center Purple Mountain LaboratoriesNanjing 211111China

With the development and widespread use of blockchain in recent years,many projects have introduced blockchain technology to solve the growing security issues of the Industrial Internet of Things(IIoT).However,due to the conflict between the operational performance and security of the blockchain system and the compatibility issues with a large number of IIoT devices running together,the mainstream blockchain system cannot be applied to IIoT *** order to solve these problems,this paper proposes SBFT(Speculative Byzantine Consensus Protocol),a flexible and scalable blockchain consensus mechanism for the Industrial Internet of *** has a consensus process based on speculation,improving the throughput and consensus speed of blockchain systems and reducing communication *** order to improve the compatibility and scalability of the blockchain system,we select some nodes to participate in the consensus,and these nodes have better performance in the *** multiple properties determine node performance,we abstract the node selection problem as a joint optimization problem and use Dueling Deep Q Learning(DQL)to solve ***,we evaluate the performance of the scheme through simulation,and the simulation results prove the superiority of our scheme.

关键词： Industrial Internet of Things Byzantine fault tolerance speculative consensus mechanism Markov decision process deep reinforcement learning

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Reduced-search guessing random additive noise decoding of polar codes

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Science China(Information Sciences) 2023年第2期66卷 283-284页

作者： Kefan WANG Yuejun WEI Zhenyuan CHEN Huarui YIN Liping LI Wenyi ZHANG Key Laboratory of Intelligent Computing and Signal Processing of the Ministry of Education of China Anhui University Huawei Technologies Department of electronic Engineering and Information Science University of Science and Technology of China

Guessing random additive noise decoding(GRAND) has attracted researchers since its introduction in [1]. For an additive noise channel with hard decision output, the algorithm checks all error patterns, and it schedules its search in descending likelihood order. Ordered reliability bit GRAND(ORBGRAND) [2] is a variant of *** soft channel output is available,

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Time-Dependent Variational Approach to Ground-State Phase Transition and Phonon Dispersion Relation of the Quantum Double-Well Model

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Chinese Physics Letters 2008年第8期25卷 2758-2761页

作者：钟红伟徐海清黄乒花 Department of Information and Computing Science Guangxi University of Technology Liuzhou 545006 faculty of Applied technology Hunan Institute of Engineering Xiangtan 411101 School of Physical electronics University of Electronic Science and Technology of China Chengdu 610054

The ground-state phase transition and the phonon dispersion relation of the quantum double-well model are studied by means of the time-dependent variational approach combined with a Hartree-type many-body trial wavefunction. The single-particle state is taken to be a frozen Jackiw-Kerman wavefunction. Under the condition of minimum uncertainty relation, we obtain an effective classical Hamiltonian for the system and equations of motion for the particle＇s expectation values. It is shown that the effective substrate potential transits from a symmetric double-well potential to a symmetric single-well potential, and the ground state exhibits a transition from a broken symmetry phase to a restored symmetry phase as increasing the strength of quantum fluctuations. We also obtain the phonon dispersion relations and the phonon gaps at the two phases.

关键词： FIELD-THEORY POLYACETYLENE DYNAMICS SOLITONS APPROXIMATION FLUCTUATIONS PRESSURE CHAINS ICE

Optimal Location and Sizing of Conglomerate DG-FACTS using an Artificial Neural Network and Heuristic Probability Distribution Methodology for Modern Power System Operations

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Protection and Control of Modern Power Systems 2022年第1期7卷 124-148页

作者： Anwar Shahzad Siddiqui Prashant Department of Electrical Engineering Faculty of Engineering&TechnologyJamia Millia IslamiaJamia NagarOkhlaNew Delhi 110025India

In existing power system networks,the positioning and sizing of multi-DG is critical at the optimum locations for effective energy *** optimal power flow is assessed using the NR method(without DG)in which performance parameters such as real power loss,accuracy,selectivity and MSE are obtained,but in an undesirable *** meet load demand;multi-DGs are placed and their optimal locations are assessed by the proposed heuristic probability distribution methodology and an ANN because existing techniques provides poor performance parameters for selecting the location and sizing of *** optimal positions of multi-DGs are estimated in terms of performance parameters including real power loss of transmission network,accuracy,selectivity and MSE,while the performance parameters obtained with the ANN are better than the heuristic ***,the sizing of multi-DGs is evaluated in relation to active and reactive *** is found that that sizes of multi-DGs are smaller with ANN than with heuristic *** is preferable to connect the buses having lowest real power losses with the smallest *** performance analysis is tested in the standard IEEE 9-bus and IEEE 57-bus systems on *** improve the distortion level in real and reactive power,multi-FACTS namely TCSC,TSC and STATCOM are *** switching of TCSC and TSC is done by SPWM while STATCOM switching is controlled with *** locations of multi-FACTS devices are chosen for buses having larger distortion and the sizing of multi-FACTS devices is also optimally *** application of multi-FACTS devices helps to improve power quality and fulfill load demand with minimal size in order to make the system economical.

关键词： DG Location Sizing FACTS ANN ANFIS

Analytical analysis of hollow CORC cable under thermo-mechanical loads

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Superconductivity 2023年第1期5卷 26-39页

作者： Xianhao Li Yuejin Tang Ying Xu Li Ren State Key Laboratory of Advanced Electromagnetic Engineering and technology Wuhan 430074China School of Electrical and electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China

According to engineering experience,the axial shrinkage caused by the refrigerant seriously endangers the performance of long‐distance conductor on round core(CORC)*** outage maintenance of high‐temperature superconducting(HTS)cables is inevitable,providing appropriate compensation for cyclic temperature is one of the key technologies in the actual application of power ***,this paper presents an analytical solution for hollow CORC cables under thermo‐mechanical ***,regarded as an axisymmetric composite structure,the radial temperature distribution of CORC cable under Dirichlet boundary or mixed boundary conditions was ***,assuming cable ends were axially fixed,a recursive method without variables is used to evaluate its displacement,strains,and ***,an algebraic method with axial strain as a variable is developed to analyze the mechanical behavior of the CORC cable more ***,concluded from the above derivation,a matrix equation is constructed based on continuity equations and boundary conditions,which applies to isotropic and orthotropic materials with *** results show that the analytical solution agrees with finite element method(FEM)*** to the trial results of a 360 m CORC cable,the calculation error of axial shrinkage is within 1.63 cm,and the relative error is within 6.1%.In addition,the recursive method is the fastest to calculate axial strain,while the matrix method has a significant efficiency advantage in calculating the stresses and strains of each layer.

关键词： CORC cable Analytical solution Thermo‐mechanical loads Axial shrinkage Recursive method Algebraic method

A Sparse Optimization Approach for Beyond 5G mmWave Massive MIMO Networks

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Computers, Materials & Continua 2022年第8期72卷 2797-2810页

作者： Waleed Shahjehan Abid Ullah Syed Waqar Shah Imran Khan Nor Samsiah Sani Ki-Il Kim Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan Center for Artificial Intelligence technology Faculty of Information Science&TechnologyUniversiti KebangsaanKajang43000Malaysia Department of Computer Science and Engineering Chungnam National UniversityDaejeon34134Korea

Millimeter-Wave(mmWave)Massive MIMO is one of the most effective technology for the fifth-generation(5G)wireless *** improves both the spectral and energy efficiency by utilizing the 30–300 GHz millimeter-wave bandwidth and a large number of antennas at the base ***,increasing the number of antennas requires a large number of radio frequency(RF)chains which results in high power *** order to reduce the RF chain’s energy,cost and provide desirable quality-ofservice(QoS)to the subscribers,this paper proposes an energy-efficient hybrid precoding algorithm formm Wave massive MIMO networks based on the idea of RF chains *** sparse digital precoding problem is generated by utilizing the analog precoding ***,it is jointly solved through iterative fractional programming and successive convex optimization(SCA)*** results show that the proposed scheme outperforms the existing schemes and effectively improves the system performance under different operating conditions.

关键词： 5G mmwave precoding massive mimo complexity