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Image super-resolution reconstruction based on sparse representation and low-rank matrix completion

Journal of Information and Computational science 2012年第13期9卷 3859-3866页

作者： Jing, Guodong Shi, Yunhui Yin, Baocai Beijing Municipal Key Lab. of Multimedia and Intelligent Software Technology College of Computer Science and Technology Beijing University of Technology Beijing 100124 China

This paper addresses the problem of generating a High-resolution (HR) image from a single Low-resolution (LR) image. We propose the super-resolution reconstruction approach based on sparse representation and low-rank matrix completion. The approach represents images in forms of sparse and rearranges image regions into the low dimension construction{matrices of low rank. High-frequency details of image are restored using the sparse representation which is recovered from the down-sampled images. For paths at the same position of multiple pictures which are obtained by several super resolution reconstructions are highly correlated, they are arranged to be a matrix of low-rank which can be completed exactly from corrupted entries. Experiment results demonstrate that the proposed method significantly improves the PSNR and visual quality of reconstructed high-resolution images. 1548-7741/Copyright © 2012 Binary Information Press.

关键词： Image enhancement

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Optimal point movement for covering circular regions

Optimal point movement for covering circular regions

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23rd International Symposium on Algorithms and Computation, ISAAC 2012

作者： Chen, Danny Z. Tan, Xuehou Wang, Haitao Wu, Gangshan Department of Computer Science and Engineering University of Notre Dame Notre Dame IN 46556 United States Tokai University 4-1-1 Kitakaname Hiratsuka 259-1292 Japan Department of Computer Science Utah State University Logan UT 84322 United States State Key Lab. for Novel Software Technology Nanjing University Hankou Road 22 Nanjing 210093 China

ISBN: (纸本)9783642352607

Given n points in a circular region C in the plane, we study the problem of moving these points to the boundary of C to form a regular n-gon such that the maximum of the Euclidean distances traveled by the points is minimized. These problems find applications in mobile sensor barrier coverage of wireless sensor networks. The problem further has two versions: the decision version and optimization version. In this paper, we present an O(n log2 n) time algorithm for the decision version and an O(n log3 n) time algorithm for the optimization version. The previously best algorithms for these two problem versions take O(n3.5) time and O(n3.5 log n) time, respectively. A by-product of our techniques is an algorithm for dynamically maintaining the maximum matching of a circular convex bipartite graph;our algorithm performs each vertex insertion or deletion on the graph in O(log 3.5 n) time. This result may be interesting in its own right. © Springer-Verlag 2012.

关键词： Wireless sensor networks

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Optimal Pricing of Multi-model Hybrid system for PaaS Cloud Computing

Optimal Pricing of Multi-model Hybrid System for PaaS Cloud ...

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International Conference on Cloud and Service Computing (CSC)

作者： Hao Lu Xing Wu Wu Zhang Jin Liu School of Computer Engineering and Science Shanghai University Shanghai China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China State Key Lab. Of Software Engineering Wuhan University Wuhan China

Success of cloud computing service depends on an acceptable pricing model, especially in the PaaS. As a dynamic platform, PaaS layer depends on the infrastructure layer and extends to the application layer. How to find an optimal pricing policy is the problem for the cloud providers in face of stochastic and dynamic demand. In this paper, we present an approach of dynamic pricing model in order to get max profits. We analyze the model by a multi-condition hybrid system. But we also use a theory of revenue maximization and cost minimization. When at a current state, the system content cost minimization to build a hybrid system for revenue maximization, we will get the most profits.

关键词： Pricing Cloud computing Computational modeling Mathematical model Educational institutions Optimal control Equations

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MOEA/D with iterative thresholding algorithm for sparse optimization problems

MOEA/D with iterative thresholding algorithm for sparse opti...

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12th International Conference on Parallel Problem Solving from Nature, PPSN 2012

作者： Li, Hui Su, Xiaolei Xu, Zongben Zhang, Qingfu Institute for Information and System Sciences Key Lab. for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an Shaanxi 710049 China School of Computer Science and Electronic Engineering University of Essex Wivenhoe Park Colchester CO4 3SQ United Kingdom

ISBN: (纸本)9783642329630

Currently, a majority of existing algorithms for sparse optimization problems are based on regularization framework. The main goal of these algorithms is to recover a sparse solution with k non-zero components(called k-sparse). In fact, the sparse optimization problem can also be regarded as a multi-objective optimization problem, which considers the minimization of two objectives (i.e., loss term and penalty term). In this paper, we proposed a revised version of MOEA/D based on iterative thresholding algorithm for sparse optimization. It only aims at finding a local part of trade-off solutions, which should include the k-sparse solution. Some experiments were conducted to verify the effectiveness of MOEA/D for sparse signal recovery in compressive sensing. Our experimental results showed that MOEA/D is capable of identifying the sparsity degree without prior sparsity information. © 2012 Springer-Verlag.

关键词： Multiobjective optimization

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On-site determination of heavy metal in soil using electrochemical stripping analysis

On-site determination of heavy metal in soil using electroch...

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American Society of Agricultural and Biological Engineers Annual International Meeting 2012

作者： Wang, Zhiqiang Gang, Liu Yang, Xiaojing Key Lab. of Modern Precision Agriculture System Integration Research China Agricultural University 17 Qinghua Donglu Beijing China China Agricultural University 17 Qinghua Donglu Beijing China College of Computer Science and Technology Shandong University of Technology 12 Zhangzhou Road Zibo China

ISBN: (纸本)9781622762088

Heavy metals are considered to be hazardous pollutants with toxic effects on plant and/or human health. Different techniques and methods (e.g., AAS, ICP-MS, ICP-OES) have been utilized for trace metals determination in the lab.ratory, but they are characterized by high costs, complex operation and long time consuming. The demand of rapid on-site screening and assessment of agricultural land contaminate induced by heavy metal is highly desirable. This paper reported a fast, inexpensive electrochemical analysis method for the simultaneous determination of cadmium (Cd) and lead (Pb) in soil samples. A simplified soil extraction procedure, using 0.11 molL-1 acetic acid and a 1 h ultrasonic agitation, had been used to fulfill the requirements of field-based screening usage. A disposable sensor, incorporating a three-electrode configuration (working electrode, reference electrode and counter electrode), had been fabricated by low cost screen-printing technology. The surface of graphite carbon working electrode was judiciously modified by multiwalled carbon nanotubes(MWCNTs)/Nafion/bismuth coating. Coupled with the portable electrochemical instrument, trace detection of heavy metal ions had been carried out by square wave anodic stripping voltammetry (SWASV) technique. The electrode exhibited good sensibility and stability in the electrochemical measurement. Linear responses were obtained in the range from 1 to 80 μgL-1 for both the metal ions at a preconcentration time of 180s, with detection limits of 0.5 μgL-1 for Cd(II) and 0.8 μgL -1 for Pb(II), respectively. The relative standard deviation is 1.9% and 2.3% for 20 μgL-1 each of Cd(II) and Pb(II). Soil samples were assayed by the proposed process and compared against standard ICP-MS analysis, the results showed good agreement between methods.

关键词： Soils

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Computation of bilingual word similarities by metaphorical properties

Computation of bilingual word similarities by metaphorical p...

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2012 International Conference on Machine Learning and Cybernetics, ICMLC 2012

作者： Kuang, Hai-Bo Li, Bin Chen, Chen Jin, Peng Chen, Xiao-He Research Center of Language and Informatics Nanjing Normal University Nanjing 210000 China State Key Lab. for Novel Software Technology Nanjing University Nanjing 210000 China Department of English Language and Literature Graduate School of Shanghai International Studies University Shanghai 200000 China School of Computer Science Leshan Normal University Leshan 614000 China

ISBN: (纸本)9781467314855

Measuring word similarities is a fundamental issue in NLP, while the measuring procedure is always aided by dictionaries or corpus. However, when figurative or metaphor usages are considered, the situation becomes more complicated. Therefore, based on the Chinese-English bilingual lexical cognitive property knowledgebase we constructed, we design several algorithms to compute word similarities by metaphorical properties. Through experiments based on four different algorithms and over 200 word pairs in the knowledgebase, we find the algorithm DSOMP yields better results despite of the differences of word semantic classes and languages. © 2012 IEEE.

关键词： Semantics

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Resource-distortion modeling for video streaming over mesh networks with priority-based packet scheduling

Resource-distortion modeling for video streaming over mesh n...

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2012 13th IEEE International Conference on Multimedia and Expo, ICME 2012

作者： Zhang, Yongfei Zhang, Yunsheng Qin, Shiyin He, Zhihai Beijing Key Lab. of Digital Media School of Computer Science and Engineering Beihang University Beijing 100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Department of Electrical and Computer Engineering University of Missouri Columbia MO 65211 United States

ISBN: (纸本)9781467316590

Video streaming over mesh networks operates under stringent network resource constraints, with a large number of video sessions competing for limited network resources. In this work, we aim to establish so-called resource-distortion models to characterize the inherent relationship between the allocated network resources to each video session and its end-to-end video distortion or presentation quality at the receiver end. We observed that priority-based packet scheduling has significant impact on such resource-distortion relationship. Using ANN-based learning methods, we develop an end-to-end packet delay bound violation (PDBV) probability model for video streaming over multi-hop networks with priority-based packet scheduling. We then derive a quadratic video transmission distortion model to capture the unique behavior of priority-based packet scheduling and its impact on the end-to-end video distortion. Based on these resource-distortion models, we are able to predict the end-to-end distortion for video streaming over multi-hop networks with priority-based packet scheduling. Our extensive experimental results demonstrate that the proposed method is very accurate. © 2012 IEEE.

关键词： Video streaming

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DOTA: A Double Truthful Auction for spectrum allocation in dynamic spectrum access

DOTA: A Double Truthful Auction for spectrum allocation in d...

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IEEE Conference on Wireless Communications and Networking

作者： Qinhui Wang Baoliu Ye Tianyin Xu Sanglu Lu Song Guo National Key Lab. for Novel Software Technology Nanjing University China Department of Computer Science and Engineering U.C. San Diego USA School of Computer Science and Engineering University of Aizu Japan

Spectrum auctions have been proposed as an effective approach to fairly and efficiently trade the scarce spectrum resource among wireless users. The most significant challenge of the auction design to provide economic robustness, particularly truthfulness, under the local-dependent interference constraints. However, existing designs either do not consider spectrum reuse or are based on the impractical assumption that each user requests at most one channel. In this paper, we address this problem by proposing DOTA, a DOuble Truthful Auction for dynamic spectrum access. DOTA is economic-robust in terms of truthfulness, individual rationality, and no-deficit. It achieves improved utilization by exploiting spectrum reuse as well as dealing with the interference constraints. Moreover, DOTA minimizes the network transaction overhead and provides flexible channel bidding including range bidding and strict bidding.

关键词： Economics Robustness Cost accounting Pricing Resource management Interference constraints Niobium

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Practical privacy for value-added applications in vehicular ad hoc networks 5th

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5th International Conference on Internet and Distributed Computing systems, IDCS 2012

作者： Zhang, Lei Wu, Qianhong Qin, Bo Domingo-Ferrer, Josep Shanghai Key Laboratory of Trustworthy Computing Software Engineering Institute East China Normal University Shanghai China UNESCO Chair in Data Privacy Dept. of Comp. Eng. and Maths Universitat Rovira i Virgili TarragonaCatalonia Spain Key Lab. of Aerospace Information Security and Trusted Computing Ministry of Education Wuhan University School of Computer China Department of Maths School of Science Xi’an University of Technology China

ISBN: (纸本)9783642348822

Advances in mobile networking and information processing technologies have triggered vehicular ad hoc networks (VANETs) for traffic safety and value-added applications. Most efforts have been made to address the security concerns while little work has been done to investigate security and privacy for value-added applications in VANETs. To fill this gap, we propose a value-added application, specifically, a security and privacy preserving location-based service (LBS) scheme for VANETs. For each LBS transaction, the scheme provides authentication, integrity and non-repudiation for both the service provider and the user. A user can obtain the service in an anonymous way and hence user privacy is well protected. However, a tracing procedure can be invoked to find malicious users, thereby efficiently preventing users from abusing the anonymity provided by the system. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Location based services

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Geese PSO optimization in geometric constraint solving

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Information Technology Journal 2012年第4期11卷 504-507页

作者： Cao, Chun-Hong Wang, Li-Min Han, Chun-Yan Zhao, Da-Zhe Zhang, Bin College of Information Science and Engineering Northeastern University Shenyang 110819 China College of Computer Science and Technology Jilin University Changchun Jilin 130012 China State Key Lab. for Novel Software Technology Nanjing University China Key Laboratory of Medical Image Computing Ministry of Education Northeastern University Shenyang Liaoning 110819 China

Geometric constraint problem is equivalent to the problem of solving a set of nonlinear equations substantially. The constraint problem can be transformed to an optimization n problem. We can solve the problem with GeesePSO optimization. In this paper, an improved algorithm is proposed using the characteristics of the flight of geese for reference. The improved algorithm has superiority over PSO;for one thing, it keeps the population various by ordering all the particles and making each particle fly following its anterior particle;for another thing, it strengthens cooperation and competition between particles by making each particle share more useful information of the other particles. The experiment shows that it can improve the geometric constraint solving efficiency and possess better convergence property than the compared algorithms. © 2012 Asian Network for Scientific Information.

关键词： Nonlinear equations

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