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Congress on Evolutionary Computation

作者： Lei Zhang Fengiiao Sun Fan Cheng Haiping Ma Xiaoyan Sun Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei China Institutes of Physical Science and Information Technology Anhui University Hefei China School of Information and Control Engineering China University of Mining and Technology Xuzhou China

ISBN: (数字)9781728169293

ISBN: (纸本)9781728169309

Influence maximization refers to selecting a group of nodes from a social network, which obtains the largest influence spread under a cascade model. However, most of the existing works only focused on the influence and ignored the diversity of influenced crowd. Thus, scholars have raised the issue of diversified social influence maximization recently, using the category information of nodes to design diversity indicator and introducing a trade-off parameter to balance the two objectives influence and diversity as one single objective for optimization. In fact, the category information of nodes in the network is usually difficult to be collected, thus the definition of diversity based on nodes' categories is not very general and accurate. In addition, it is very difficult to set the trade-off parameter, especially when there is no prior knowledge in real applications. To this end, we employ overlapping community structure information to design the diversity of nodes without any node's additional (e.g. category) information. Due to the two objectives of influence and diversity may be conflicting, a multi-objective evolutionary algorithm named moeA-DIM is proposed to optimize the two objectives simultaneously, which does not need to set the tradeoff parameter between the two objectives. In moeA-DIM, a network reduction strategy based on overlapping community structure is suggested to greatly reduce the search space. In addition, a population initialization strategy based on random walk is designed to accelerate the convergence of the algorithm. Experiments on six real-world datasets show that the proposed algorithm moeA-DIM has promising performance in terms of both effectiveness and efficiency.

关键词： Optimization Encoding

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Solving Electromagnetic Scattering from Microstrip Arrays with Multiple-Traces Surface Integral Equations

Solving Electromagnetic Scattering from Microstrip Arrays wi...

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2018 IEEE International Conference on Computational Electromagnetics, ICCEM 2018

作者： Zhao, Ran Feng, Jian Song, Kaihong Huang, Zhixiang Hu, Jun Anhui University Ministry of Education Key Laboratory of Intelligent Computing and Signal Processing China School of Electronic Engineering China

ISBN: (纸本)9781538612415

In this paper, a new multiple-traces Poggio-Miller-Chang-Harrington-Wu-Tsai (MT-PMCHWT) equation is proposed to simulate the electromagnetic scattering from microstrip structures. Different from traditional EFIE-PMCHWT method, in this new multiple-traces method, the original object can be decomposed into two independent domains i.e., the exterior region (free space) and interior region (microstrip), and Robin transmission conditions (TCs) is enforced on the interface between exterior and interior regions to ensure the continuity of fields. In comparison to the traditional EFIE-PMCHWT, this new MT-PMCHWT has a better convergence property. Because the continuity of fields is ensured by TCs, the exterior and interior regions can be discretized by non-conformal meshes, which improves the flexibility and efficiency of the proposed methods substantially. © 2018 IEEE.

关键词： Surface scattering

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Graphene based functional devices: A short review

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Frontiers of physics 2019年第1期14卷 23-42页

作者： Rong Wang Xin-Gang Ren Ze Yan Li-Jun Jiang Wei E. I. Sha Guang-Cun Shan Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong China Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei 230039 China School of Instrumentation Science & Opto-electronics Engineering Beihang University Beijing 100191 China Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University Hangzhou 310027 China California NanoSystem Institute and Department of Chemistry & Biochemistry University of California Los Angeles CA 90095 USA

Graphene is an ideal 2D material system bridging electronic and photonic devices. It also breaks the fundamental speed and size limits by electronics and photonics, respectively. Graphene offers multiple functions of signal transmission, emission, modulation, and detection in a broad band, high speed, compact size, and low loss. Here, we have a brief view of graphene based functional devices at microwave, terahertz, and optical frequencies. Their fundamental physics and computational models were discussed as well.

关键词： graphene terahertz antenna microwave

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Design of New Miniaturized Broadband Bandpass Filter Based on SIR

Design of New Miniaturized Broadband Bandpass Filter Based o...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Kaiyue Duan Pingjuan Zhang Dongya Cheng Yawen Song Lichang Huang Minquan Li Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China Anhui Science and Technology University Hefei China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

In this paper, a compact and miniaturized wideband bandpass filter based on resonant ring loading stepped impedance resonator is designed. The filter designed in this paper uses the resonant ring as the basic resonator unit. By loading the SIR, the passband width of the filter is improved. The 3 dB bandwidth of this filter is 300 MHz, and the relative fractional bandwidth is 15%. Etching a complementary open resonant ring defected ground structure (DGS) on the floor that changes the current distribution on the floor and creates a band gap with passband characteristics, making the filter compact and compact. The size of filter is 3.5 cm * 4.0 cm. The simulation results show that the filter center frequency is 2.0 GHz, the return loss is 29 dB, and the insertion loss is 1.1 dB. The filter introduces two transmission zero points of 1.3 GHz and 2.6 GHz on both sides of the passband, which improves the out-of-band rejection of the filter. The filter structure designed in this paper has the advantages of small size, wide bandwidth and strong stop band rejection, which verifies the feasibility of the filter design.

关键词： Bandwidth Broadband communication Impedance Passband Resonant frequency Microstrip Filtering theory

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Broadband Circular Polarized Composite Spiral Antenna Using Two-layer AMC

Broadband Circular Polarized Composite Spiral Antenna Using ...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Yawen Song Pingjuan Zhang Yanyang Liu Kaiyue Duan Lichang Huang Minquan Li Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China Anhui Science and Technology University Hefei China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

In this paper, a broadband circular polarized (CP) composite spiral antenna using two-layer artificial magnetic conductor (AMC) is designed. The broadband circularly polarized radiation of the antenna in free space is realized by combining Archimedes spiral and equiangular spiral. At the same time, a new two-layer AMC structure is designed to improve the degradation of axial ratio and bandwidth caused by unidirectional antenna radiation in some frequency bands. The two-layer AMC is designed to operate with 90° reflection-phase bandwidth of 4.3-6 GHz (33%). Three different reflector surfaces: perfect electric conductor (PEC), traditional single-layer AMC surface and two-layer AMC surface are used and compared. The axial ratio performance of the antenna loaded with two-layer AMC is significantly better than that of the traditional AMC in the band of 5-6.5 GHz. The axial ratio and bandwidth was further improved by removing the central patch on the two-layer AMC surface and adding a high dielectric substrate underneath. The simulation results show that in the 2.5-10 GHz working band, the VSWR

关键词： Spirals Broadband antennas Bandwidth Loaded antennas Periodic structures Helical antennas

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The Research of Extraordinary Transmission Mechanism on Metallic Grating Structure Based on NS-FDTD

The Research of Extraordinary Transmission Mechanism on Meta...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Jundui Mu Pingjuan Zhang Minquan Li Kaifeng Cui Dui Liu Xuhui Zhang Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China Anhui Science And Technology University Hefei China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

In order to eliminate the calculation error which is generated by the field point selection of finite-difference time-domain method on the interface of medium, this paper introduces a virtual field which is then unfolded by Taylor series, and gives the iterative formula of the nonstandard finite-difference time-domain method (NS-FDTD). The non-standard finite-difference time-domain method (NS-FDTD) is used to simulate plane wave irradiating vertically the novel sub-wavelength metal grating resonator, effects of the thickness of metal layer and the relative dielectric constant to extraordinary transmission characteristic are studied, and the extraordinary transmission mechanism is analyzed using the theory of Fabry-Perot cavity. A novel structure with extraordinary transmission characteristic is designed, and the extraordinary transmission characteristic in 450-900 THz band has also been studied using the method of NS-FDTD, the effect caused by some parameters such as thickness of metal layer, relative dielectric constant of dielectric layer has been given. The results show: as the thickness of the metal layer decreases, the factor of extraordinary transmission increases and moves towards high frequency, what's more, the factor moves towards low frequency as the relative dielectric constant of dielectric layer increases. This study provides a theoretical basis for further research on metal film and its extraordinary transmission mechanism.

关键词： Metals Time-domain analysis Dielectric constant Mathematical model Gratings Cavity resonators

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Compact Dual-wideband Bandpass Filter Using Stub Loaded Zero-degree Feed Coupling Structure

Compact Dual-wideband Bandpass Filter Using Stub Loaded Zero...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Lichang Huang Pingjuan Zhang Minquan Li Yawen Song Kaiyue Duan Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China Anhui Science And Technology University Hefei China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

A novel compact dual-wideband bandpass filter is proposed in this paper, by employing stub loaded ring-shape Uniform Impedance Resonator (UIR) and embed-inside T-shape resonator which contributes to reducing circuit size. Odd-even mode method can be used to analyze the resonance characteristic, since the structure is symmetrical. The stub-load UIR can produce two resonant frequencies of f odd1 and f even1 , and the T-shape resonator can also introduce two resonant frequencies of f odd2 and f even2 . By adjusting the position of odd-even mode resonant frequencies and the coupling degree between UIR and T-shape resonator, two wide passbands can be realized. In design, a pair of zero-degree feed coupling structure is utilized to generate two transmission zeroes at the lower and upper of the first passband, improving the frequency selectivity of the first. The 3 dB frequency bands range of the first passband and the second are 2.5 GHz-3.3 GHz and 5.1 GHz-6.2 GHz, and the fractional bandwidths are 29% and 19%, corresponding to center frequencies at 2.8 GHz, 5.8 GHz, respectively. Comparing with the previous works, the proposed dual-wideband bandpass filter has a compactness of 12 × 10.45 mm 2 and has lower insertion loss of 0.1 dB and 0.12 dB, corresponding to the first and the second pass-band.

关键词： Band-pass filters Resonant frequency Passband Feeds Couplings Microwave antennas Dual band

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A Multiband High Gain Grooves Antenna

A Multiband High Gain Grooves Antenna

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Ping-Juan Zhang Yawen Song Lichang Huang Minquan Li Anhui Science and Technology University Bengbu China Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

In this paper, we present a novel high-gain multiband surface-wave antenna base on extraordinary optical transmission. In order to make the performance of antenna more better we introduced metal wall structure, it can improve the gain of antenna and the half-power beamwidth also have a good embodiment in the E-plane and H-plane. Simulation results show that the gain of proposed antenna can reach more than 12 dB.

关键词： Metals Antenna measurements Gain Surface waves Electromagnetics Transmitting antennas

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Let's play music: Audio-driven performance video generation

arXiv

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arXiv 2020年

作者： Zhu, Hao Li, Yi Zhu, Feixia Zheng, Aihua He, Ran Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei China CASIA Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Center for Excellence in Brain Science and Intelligence Technology CAS Beijing China

We propose a new task named Audio-driven Performance Video Generation (APVG), which aims to synthesize the video of a person playing a certain instrument guided by a given music audio clip. It is a challenging task to generate the high-dimensional temporal consistent videos from low-dimensional audio modality. In this paper, we propose a multistaged framework to achieve this new task to generate realistic and synchronized performance video from given music. Firstly, we provide both global appearance and local spatial information by generating the coarse videos and keypoints of body and hands from a given music respectively. Then, we propose to transform the generated keypoints to heatmap via a differentiable space transformer, since the heatmap offers more spatial information but is harder to generate directly from audio. Finally, we propose a Structured Temporal UNet (STU) to extract both intra-frame structured information and inter-frame temporal consistency. They are obtained via graph-based structure module, and CNN-GRU based high-level temporal module respectively for final video generation. Comprehensive experiments validate the effectiveness of our proposed framework. Copyright © 2020, The Authors. All rights reserved.

关键词： Music

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Electromagnetic scattering of two-dimensional rough cylinder based on statistical integral equation

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Journal of Physics: Conference Series 2020年第1期1651卷

作者： Mengnan Zhu Anqi Wang Zhixiang Huang Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China.

The study of electromagnetic scattering from Gaussian rough surface is of great significance in radar reconnaissance, target tracking and ocean remote sensing. The moment method (MOM) is a commonly used method with high accuracy. However, in the past research, Monte Carlo method is used to simulate the Gaussian rough surface. In this method, a large number of random simulation operations are carried out, and then a statistical convergence result is obtained by counting the results of all operations. In this paper, the stochastic integral equation method SIEM(Stochastic Integral Equation Method) is proposed to calculate the electromagnetic scattering of Gaussian rough surface. SIEM avoids the difficulty of high difficulty precise modeling and repeated calculation many times, and only single modeling and calculation are carried out for the target problem. In this paper, the electromagnetic scattering of two-dimensional cylinder with Gaussian rough surface is solved, and the effectiveness of SIEM is proved by comparing with mom.

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