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MacWilliams identities of linear codes with respect to RT metric over Mn×s (F2[u, v]{uk, v2, uv-Vu})

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MacWilliams identities of linear codes with respect to RT me...

作者： Shi, Minjia Tang, Jie Ge, Maorong Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University No. 3 Feixi Road Hefei Anhui Province230039 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China School of Mathematical Sciences Anhui University Hefei230601 China

The definitions of the Lee complete ρ weight enumerator and the exact complete ρ weight enumerator over Mn×s (F2[u, v]{uk, v2, uv-vu}) are introduced, and the MacWilliams identities with respect to the RT metric for these two weight enumerators of linear codes over Mn×s (F2[u, v]{uk, v2, uv-vu}) are obtained. Finally, we give two examples to illustrate the results we obtained. Copyright © 2017 The Institute of Electronics, Information and Communication Engineers.

关键词： Codes (symbols)

A whole-process WiFi security perception software system

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A whole-process WiFi security perception software system

International Conference on Circuits, System and Simulation (ICCSS)

作者： Heqing Huang Yanjun Hu Yan Ja Shiliang Ao Department of Computing Imperial College London London UK Key Laboratory of Intelligent Computing & Signal Processing Anhui University Hefei China Xidian University Xian China

ISBN: (纸本)9781538603932

A whole-process WiFi security perception software system is designed in this paper based on the analysis of client's wireless access process, it consists of three modules to protect user from security threats during the pre-connection, connection and after-connection. The system could detects WiFi environment and shows with 3D effect, marking the Rogue AP, which is found out by multi-factors analysis techniques. During the connection, it inspired by the idea of Fog computing, sending fake traffic to protect PSK from sniffing. After connection, the system detects Deauth attack in time, and traces the attacker. Finally, The software functionalities is realized, all the suspicious points are displayed on the User Interface (UI). The corresponding experimental testing shows that it could protect the surf in the WiFi environment effectively.

关键词： Protocols Wireless fidelity Encryption Software systems Phase shift keying

Viewpoint selection for photographing architectures

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arXiv 2017年

作者： He, Jingwu Wang, Linbo Zhou, Wenzhe Zhang, Hongjie Cui, Xiufen 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 Samsung Electronics R&D China

—This paper studies the problem of how to choose good viewpoints for taking photographs of architectures. We achieve this by learning from professional photographs of world famous landmarks that are available on the Internet. Unlike previous efforts devoted to photo quality assessment which mainly rely on 2D image features, we show in this paper combining 2D image features extracted from images with 3D geometric features computed on the 3D models can result in more reliable evaluation of viewpoint quality. Specifically, we collect a set of photographs for each of 15 world famous architectures as well as their 3D models from the Internet. Viewpoint recovery for images is carried out through an image-model registration process, after which a newly proposed viewpoint clustering strategy is exploited to validate users’ viewpoint preferences 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 using a specifically designed SVM-2K multi-view learner, achieving superior performance over using solely 2D or 3D features. We show the effectiveness of the proposed approach through extensive experiments. The experiments also demonstrate that our system can be used to recommend viewpoints for rendering textured 3D models of buildings for the use of architectural design, in addition to viewpoint evaluation of photographs and recommendation of viewpoints for photographing architectures in practice. Copyright © 2017, The Authors. All rights reserved.

关键词： Photography

New energy-efficient time synchronization algorithm design for wireless sensor networks

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New energy-efficient time synchronization algorithm design f...

Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Tengfei Xia Shuping He School College of Electrical Engineering and Automation Anhui University Hefei Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei

ISBN: (纸本)9781538629024

With the expansion of the scale of wireless sensor network (WSN), the network node number is increasing. Because of the huge network overhead and low precision, the reference broadcast time synchronization algorithm can not meet the actual demand. In this paper, a novel time synchronization algorithm for high precision energy efficient wireless sensor networks is proposed. Through a Markov random field-based maximum a posteriori estimation method of wireless sensor network in two nonadjacent nodes in receiving multiple reference broadcast messages, the algorithm estimated the clock drift under the condition of phase error estimation, tracked in real time by the Gardner loop, and then realized the time synchronization process. Finally, the MATLAB simulation showed the proposed algorithm not only has a further improvement in the time synchronization accuracy, but also effectively reduces the overall energy consumption level of the whole WSN.

关键词： Synchronization Wireless sensor networks Clocks Algorithm design and analysis Silicon Maximum a posteriori estimation

On self-dual and LCD double circulant and double negacirculant codes over Fq+ uFq

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arXiv 2018年

作者： Shi, Minjia Zhu, Hongwei Qian, Liqin Sok, Lin Sol, Patrick Key Laboratory of Intelligent Computing Signal Processing Ministry of Education Anhui University No.3 Feixi Road Hefei Anhui230039 China School of Mathematical Sciences Anhui University Hefei Anhui230601 China National Mobile Communications Research Laboratory Southeast University China Department of Mathematics Royal University of Phnom Penh Phnom Penh12156 Cambodia CNRS LAGA University of Paris 8 Saint-Denis93526 France

Double circulant codes of length 2n over the semilocal ring R = Fq + uFq, u2 = u, are studied when q is an odd prime power, and-1 is a square in Fq. Double negacirculant codes of length 2n are studied over R when n is even and q is an odd prime power. Exact enumeration of self-dual and LCD such codes for given length 2n is given. Employing a duality-preserving Gray map, self-dual and LCD codes of length 4n over Fq are constructed. Using random coding and the Artin conjecture, the relative distance of these codes is bounded below. The parameters of examples of the modest length are computed. Several such codes are optimal. Copyright © 2018, The Authors. All rights reserved.

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Design The Finite-Time H∞ Controller of A Class of Time-Delayed Uncertain Positive Systems

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Design The Finite-Time H∞ Controller of A Class of Time-Del...

第29届中国控制与决策会议

作者： C.C.Ren Q.L.Ai S.S.Wu S.P.He School of Electrical Engineering and Automation Anhui University Key Laboratory of Intelligent Computing & Signal Processing Ministry of EducationSchool of Electrical Engineering and AutomationAnhui University

This paper deals with the finite-time H,controller problem for a class of time-delay and with uncertain parameters continuous positive *** the systems with unknown disturbances,our aim is to design a suitable control law which makes the closed-loop system be finite-time bounded and satisfies the given H *** using the constructed Lyapunov function and linear matrix inequalities（LMIs） technique,sufficient conditions that the solution of the finite-time H∞controller existed are given and ***,a simulation example is presented to show the feasibility and validity of the present methods.

关键词： positive systems finite-time H_∞ controller linear matrix inequalities(LMIs) time-delays uncertain parameters

How many weights can a linear code have?

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arXiv 2018年

作者： Shi, Minjia Zhu, Hongwei Solé, Patrick Cohen, Gérard D. Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University No. 3 Feixi Road Hefei Anhui Province230039 China School of Mathematical Sciences Anhui University Hefei230601 China CNRS/LAGA University of Paris 8 2 rue de la Liberté Saint-Denis93 526 France TelecomParisTech 46 rue Barrault Paris75 013 France

We study the combinatorial function L(k, q), the maximum number of nonzero weights a linear code of dimension k over Fq can have. We determine it completely for q = 2, and for k = 2, and provide upper and lower bounds in the general case when both k and q are ≥ 3. A refinement L(n, k, q), as well as nonlinear analogues N(M, q) and N(n, M, q), are also introduced and studied. Copyright © 2018, The Authors. All rights reserved.

关键词： Codes (symbols)

Double circulant self-dual and LCD codes over Galois rings

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arXiv 2018年

作者： Shi, Minjia Huang, Daitao Sok, Lin Solé, Patrick School of Mathematical Sciences Anhui University Hefei230601 China Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University No. 3 Feixi Road Hefei Anhui Province230039 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Anhui University Hefei230601 China CNRS/LAGA University of Paris 8 2 rue de la Liberté Saint-Denis93 526 France

This paper investigates the existence, enumeration and asymptotic performance of self-dual and LCD double circulant codes over Galois rings of characteristic p2 and order p4 with p and odd prime. When p ≡ 3 (mod 4), we give an algorithm to construct a duality preserving bijective Gray map from such a Galois ring to Z2p2. Using random coding, we obtain families of asymptotically good self-dual and LCD codes over Zp2, for the metric induced by the standard Fp-valued Gray maps. Copyright © 2018, The Authors. All rights reserved.

关键词： Codes (symbols)

Viewpoint selection for taking a good photograph of architecture 24

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

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