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arXiv 2018年

作者： Wang, Rong Jiang, Lijun Ren, Xingang Yan, Ze Sha, Wei E.I. Shan, Guangcun Department of Electrical and Electronic Engineering University of Hong Kong Pokfulam Road Hong Kong Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei230039 China School of Instrumentation Science & Opto-electronics Engineering Beihang University Beijing100191 China Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University Hangzhou310027 China School of Instrumentation Science & Opto-electronics Engineering Beihang University Beijing100191 China California NanoSystem Institute Department of Chemistry & Biochemistry University of California Los AngelesCA90095 United States

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 will have a brief view of graphene based functional devices at microwave, terahertz, and optical frequencies. Their fundamental physics and computational models will be discussed as well. Copyright © 2018, The Authors. All rights reserved.

关键词： Graphene

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Viewpoint selection for taking a good photograph of architecture 24

Viewpoint selection for taking a good photograph of architec...

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24th Pacific Conference on Computer Graphics and Applications, Pacific Graphics 2016

作者： He, Jingwu Zhou, Wenzhe Wang, Linbo Zhang, Hongjie Guo, Yanwen National Key Lab for Novel Software Technology Nanjing University NanJing210023 China MOE Key Laboratory of Intelligent Computing and Signal Processing Institute of Media Computing Anhui University HeFei230039 China

ISBN: (纸本)9783038680246

This paper studies the problem of how to choose the viewpoint for taking good photographs for architecture. We achieve this by learning from professional photographs of world famous landmarks that are available in the Internet. Unlike the previous efforts devoted to photo quality assessment which mainly rely on visual features, we show in this paper combining visual features with geometric features computed on the 3D models can result in a more reliable evaluation of viewpoint quality. Specifically, we collect a set of photographs for each of 6 world famous architectures as well as their 3D models from Internet. Viewpoint recovery for images is carried out by an image-model registration process, after which a newly proposed viewpoint clustering strategy is exploited to validate users' viewpoint preference when photographing landmarks. Finally, we extract a number of 2D and 3D features for each image based on multiple visual and geometric cues, and perform viewpoint recommendation by learning from both 2D and 3D features, achieving superior performance over using solely 2D or 3D features. We show the effectiveness of the proposed approach through extensive experiments. © 2016 The Author(s) Eurographics Proceedings © 2016 The Eurographics Association.

关键词： Architecture

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Cross-view Asymmetric Metric Learning for Unsupervised Person Re-identification

arXiv

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arXiv 2017年

作者： Yu, Hong-Xing Wu, Ancong Zheng, Wei-Shi School of Data and Computer Science Sun Yat-sen University China School of Electronics and Information Technology Sun Yat-sen University China Key Laboratory of Machine Intelligence and Advanced Computing Ministry of Education China Collaborative Innovation Center of High Performance Computing NUDT China Guangdong Key Laboratory of Big Data Analysis and Processing Guangzhou China

While metric learning is important for Person reidentification (RE-ID), a significant problem in visual surveillance for cross-view pedestrian matching, existing metric models for RE-ID are mostly based on supervised learning that requires quantities of labeled samples in all pairs of camera views for training. However, this limits their scalabilities to realistic applications, in which a large amount of data over multiple disjoint camera views is available but not labelled. To overcome the problem, we propose unsupervised asymmetric metric learning for unsupervised RE-ID. Our model aims to learn an asymmetric metric, i.e., specific projection for each view, based on asymmetric clustering on cross-view person images. Our model finds a shared space where view-specific bias is alleviated and thus better matching performance can be achieved. Extensive experiments have been conducted on a baseline and five large-scale RE-ID datasets to demonstrate the effectiveness of the proposed model. Through the comparison, we show that our model works much more suitable for unsupervised RE-ID compared to classical unsupervised metric learning models. We also compare with existing unsupervised REID methods, and our model outperforms them with notable margins. Specifically, we report the results on large-scale unlabelled RE-ID dataset, which is important but unfortunately less concerned in literatures. Copyright © 2017, The Authors. All rights reserved.

关键词： Machine learning

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Maxwell-hydrodynamic model for simulating nonlinear terahertz generation from plasmonic metasurfaces

arXiv

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arXiv 2017年

作者： Fang, Ming Huang, Zhixiang Sha, Wei E.I. Wu, Xianliang Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei230039 China College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Department of Electrical and Electronic Engineering University of Hong Kong

The interaction between electromagnetic field and plasmonic nanostructures leads to both strong linear and nonlinear behaviors. In this paper, a time-domain hydrodynamic model for describing the motion of electrons in plasmonic nanostructures is presented, in which both surface and bulk nonlinearity are considered. A coupled Maxwell-hydrodynamic system capturing full-wave physics and free electron dynamics is numerically solved with the parallel finite-difference time-domain (FDTD) method. The validation of the proposed method is presented by simulating a plasmonic metasurface. The linear response is compared with the Drude dispersion model and the nonlinear terahertz emission from a difference-frequency generation process is theoretically analyzed. The work is fundamentally important to design nonlinear plasmonic nanodevices, especially for efficient and broadband THz emitters. Copyright © 2017, The Authors. All rights reserved.

关键词： Plasmonics

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Construction of One-Gray Weight Codes and Two-Gray Weight Codes over Z4+uZ4

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Journal of Systems Science & Complexity 2016年第5期29卷 1472-1484页

作者： SHI Minjia WANG Dandan GAO Jian WU Bo Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei 230039 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096China School of Mathematical Sciences Anhui University Hefei 230601 China. School of Science Shandong University of Technology Zibo 255091 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Bcijing 100093 China

This paper firstly gives some necessary conditions on one-Gray weight linear codes. And then we use these results to construct several classes of one-Gray weight linear codes over Z_4 +uZ_4(u^2=u) with type 16^(k_1)8^(k_2)8^(k_3)4^(k_4)4^(k_5)4^(k_6)2^(k_7)2^(k_8) based on a distance-preserving Gray map from(Z4 + u Z4)n to Z2n4. Secondly, the authors use the similar approach to do works on two-Gray(projective) weight linear codes. Finally, some examples are given to illustrate the construction methods.

关键词： Generator matrix Gray map linear code one-Gray weight code two-Gray weight code

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Downlink scheduling and coordinated transmission for CRE ues with ABS in ultra-dense networks

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International Journal of Simulation: Systems, Science and Technology 2016年第4期17卷 16.1-16.6页

作者： Wang, Yi Hu, Yanjun Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China

Ultra-dense network (UDN) is a promising way to address the high throughput demand in future radio access networks. However, the downlink inter-cell interference to user equipments (UEs) in dense small cell environment is a key problem restricting the wide application. Although cell range expansion (CRE) and almost blank subframe (ABS) cancel the interference from macro cells, they cannot deal with the interference from small cells in a dense deployed network. To reduce the interference caused by high small cells density, we propose a downlink scheduling and coordinated transmission algorithm for CRE UEs. CRE UEs can be transferred to different protected subframes dynamically in time domain to avoid the main interference sources. And coordinated transmission between macro and pico eNB could help guarantee CRE UEs’ performance which are far from serving cells. Simulation results show that our proposed algorithm provides stable and substantial spectrum efficiency gains compared to traditional methods. © 2016, UK Simulation Society. All rights reserved.

关键词： Heterogeneous networks

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Design the non-fragile H controller of a category of positive systems 31

Design the non-fragile H controller of a category of positiv...

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31st Youth Academic Annual Conference of Chinese Association of Automation, YAC 2016

作者： Ren, Chengcheng Wu, Shanshan He, Shuping School of Electrical Engineering and Automation Anhui University Hefei China Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education School of Electrical Engineering and Automation Anhui University Hefei China

ISBN: (纸本)9781509044238

A non-fragile H controller design approach is studied in this paper for a class of system. The purpose is design a suitable non-fragile controller satisfied that the induced L∞ gain from disturbance signal to output signal is bounded and minimized. In order to ensure the existence of H∞ controller, the article given the sufficient conditions and proved that the condition is feasible. Simulation results are proposed to describe the validity of the designed approaches. © 2016 IEEE.

关键词： Controllers

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A theoretical analysis of second and third harmonic generation in metal nanospheres

A theoretical analysis of second and third harmonic generati...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Yaguang Zhang Zhixiang Huang Key Laboratory of intelligent Computing & Signal Processing Anhui University Hefei China

ISBN: (纸本)9781509060948

Using classical electrodynamics, a theoretical analysis of second and third harmonic generation (SHG and THG) by spherical metal clusters is presented. Based on the anharmonic oscillator model for the displacement of the surface charge, the sources of the radiation generated in second and third harmonic are determined by using the approximation of the second and third power of the linear surface charge. Then the higher harmonic electric fields are determined by matching the electric fields inside and outside the sphere. Angular dependence of the intensities and the degree of polarization are studied. Detailed results of the SHG and THG are presented. The particle size sensitivity of Mie-scattering is increased by nonlinearity.

关键词： Harmonic analysis Optical surface waves Power system harmonics Iron Electromagnetics Frequency conversion

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Fast numerical method based on compressive sensing for electromagnetic back scattering from one-dimensional rough surface with wide incidence

Fast numerical method based on compressive sensing for elect...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Y. Y. Pang A. Q. Wang T. Q. Liao Key Laboratory of Intelligent Computing & Signal Processing Anhui University Hefei China

ISBN: (纸本)9781509060948

The fast numerical method based on compressive sensing (CS) technology is introduced to calculate the electromagnetic (EM) scattering from a perfectly electrical conducting (PEC) rough surface. A new incident source with lower dimension is firstly obtained by employing the product of the measurement matrix and the voltage vector of the traditional method of moment (MOM). And then the measurements of the induced current vector are computed by solving the integral equation under the new incident source. Finally, the original induced currents on the rough surface are recovered by the Stagewise orthogonal matching Pursuit (StOMP) algorithm. Hence, the new method can greatly reduce the number of unknowns of the full MOM analysis. Good agreements between the CS and the exact results obtained by the MOM are exhibited. And the CS technology costs less time than the MOM.

关键词： Rough surfaces Surface roughness Method of moments Surface impedance Surface waves Electromagnetic scattering

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A Routing Scheme Based on Spray-and-Wait and Connecting-Capability of Node

A Routing Scheme Based on Spray-and-Wait and Connecting-Capa...

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2016 IEEE International Conference on Progress in Informatics and computing

作者： Guizhu Wang Hui Zhang Dong Pan Jian Tao Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Anhui University

DTNs overcome the problems associated with intermittent connectivity, long or variable delay, asymmetric data rates, and high error rates by using store-carry-forward message switching. In DTNs, a node is an entity with a bundle layer. A node may be a host, router, or gateway(or some combination)acting as a source, destination, or forwarder of bundles. In addition, the performance of node shows great differences. However,the previous DTN routings show blindly and randomly, which do not measure the performance of node when they forward messages. To deal with this issue, we present the concept of Node Connection Intensity(NCI) and Node Connection Stability(NCS), then propose a routing scheme based on Spray-and-Wait and Connecting-Capability of Node(SW-CCN), which evaluate relay node's forward capability synthetically according to the NCI and the NCS. The SW-CCN routing can allocate message replications dynamically and solve the problem of selecting the relay node blindly. Compared with the classical routing protocols, the simulation results show that the proposed algorithm can significantly enhance delivery rate and improve network performance.

关键词： DTNs Node Connection Intensity Node Connection Stability

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