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OpenNet: A simulator for software-defined wireless local area network

OpenNet: A simulator for software-defined wireless local are...

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IEEE Conference on Wireless Communications and Networking

作者： Min-Cheng Chan Chien Chen Jun-Xian Huang Ted Kuo Li-Hsing Yen Chien-Chao Tseng Dept. Computer Science National Chiao Tung University Hsinchu Taiwan R.O.C. Global Strategy Office D-Link Systems Inc. Santa Clara California U.S.A Dept. Computer Science and Information Engineering National University of Kaohsiung Kaohsiung Taiwan R.O.C

ISBN: (纸本)9781479930845

This study is motivated by a plan to install a software-defined wireless local area network (SDWLAN) on campus, which possesses a desired property that both data flow and device behaviors can be software-definable. Because the installation involves hundreds of access points, we must conduct simulations beforehand to verify the design and scalability of the target system. However, existing SDN simulator like Mininet does not support modeling of wireless channel and mobility. On the other hand, common network simulator like ns-3 only has limited support for software-defined controllers and does not fully implement handover process. We thus develop OpenNet, which connects Mininet to ns3 to enjoy both Mininet's advantage of controller compatibility and ns-3's ability in the wireless/mobility modeling. OpenNet also complements ns-3 by adding probe mechanism, which is missing in the current ns-3 implementation. Our simulation result demonstrates the effectiveness of OpenNet.

关键词： Handover Wireless communication IEEE 802.11 Standards Probes Signal to noise ratio Mobile nodes

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Multi-operator retargeting based on perceptual structural similarity

Multi-operator retargeting based on perceptual structural si...

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IEEE China Summit & International Conference on Signal and information Processing (ChinaSIP)

作者： Yuming Fang Weisi Lin Zhou Wang Zhijun Fang Long Xu Yong Yang School of Information Technology Jiangxi University of Finance and Economics Nanchang China School of Computer Engineering Nanyang Technological University Singapore Dept. of Electrical and Computer Engineering University of Waterloo Waterloo ON Canada National Astronomical Observatories Chinese Academy of Science Beijing China

We propose a new multi-operator retargeting algorithm by using three resizing operators of seam carving, scaling, and cropping iteratively. To determine which operator should be used at each iteration, we adopt structural similarity (SSIM) to evaluate the similarity between the original and retargeted images for the dynamic programming. Since the sizes of original and retargeted images are different, SIFT flow is used for dense correspondence between the original and retargeted images for similarity evaluation. Additionally, visual saliency is used to weight SSIM results based on the characteristics of the Human Visual System (HVS). Experimental results on a public image retargeting database show the promising performance of the proposed multi-operator retargeting algorithm.

关键词： Visualization computer vision Conferences Indexes Algorithm design and analysis Educational institutions

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Least-squares design of IIR all-pass filters using closed-form Toeplitz-plus-Hankel matrix

Least-squares design of IIR all-pass filters using closed-fo...

引用

IEEE Asia-Pacific Conference on Circuits and Systems

作者： Yue-Dar Jou Fu-Kun Chen Department of Electrical Engineering R.O.C. Military Academy Kaohsiung Taiwan R.O.C Dept. of Computer Science and Information Engineering Southern Taiwan University of Science and Technology Tainan Taiwan R.O.C

ISBN: (纸本)9781479952311

Least-squares design of infinite impulse response all-pass filters can be simplified by solving a system of linear equations. The set of linear equations associated matrix is further formulated as a Toeplitz-plus-Hankel form such that an efficient and robust Cholesky decomposition or Levinson technique can solve the all-pass filter coefficients. This paper proposes closed-form expressions for the computation of Toeplitz-plus-Hankel matrix. The elements of the closed-form expressions can be directly derived as the passband edges are specified without performing the sum of a series of Toeplitz-plus-Hankel matrix. Simulation results indicate that the proposed method achieves excellent performance with computational efficiency.

关键词： IIR filters Equations Digital filters Filtering algorithms Maximum likelihood detection Nonlinear filters Algorithm design and analysis

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Transmission line resistance compression networks for microwave rectifiers

Transmission line resistance compression networks for microw...

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Microwave, MTT-S International Symposium

作者： Taylor W. Barton Joshua Gordonson David J. Perreault Dept. of Computer Science & Information Engineering Asia University Taichung Taiwan R.O.C Department of Electrical Engineering National Sun Yat-sen University Kaohsiung Taiwan R.O.C

This work presents a development of multi-way transmission-line resistance compression networks (TLRCNs) and their application to rf-to-dc conversion. We derive analytical expressions for the behavior of TLRCNs, and describe two design methodologies applicable to both single- and multi-stage implementations. A 2.45-GHz 4-way TLRCN network is implemented and applied to create a resistance-compressed rectifier system that has narrow-range resistive input characteristics over a 10-dB power range. It is demonstrated to improve the impedance match to mostly-resistive but variable input impedance class-E rectifiers over a 10-dB power range. The resulting TLRCN plus rectifier system has >50% rf-to-dc conversion efficiency over a >10-dB input power range at 2.45 GHz (peak efficiency 70%), and SWR

关键词： Rectifiers Impedance Resistance Radio frequency Impedance measurement Length measurement Power transmission lines

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A simple model-driven approach to energy disaggregation

A simple model-driven approach to energy disaggregation

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IEEE International Conference on Smart Grid Communications (SmartGridComm)

作者： Guoming Tang Kui Wu Jingsheng Lei Jiuyang Tang University of Victoria Victoria BC CA School of Computer and Information Engineering Shanghai University of Electric Power Shanghai China Dept. of Computer Science University of Victoria B.C. Canada Sci. & Tech. on Information Systems Engineering Lab National University of Defense Technology Changsha China

ISBN: (纸本)9781479949335

Energy disaggregation is to discover the energy consumption of individual appliances from their aggregated energy values. To solve the problem, most existing approaches rely on either appliances' signatures or their state transition patterns, both hard to obtain in practice. Aiming at developing a simple, universal model that works without depending on sophisticated machine learning techniques or auxiliary equipments, we make use of easily accessible knowledge of appliances and the sparsity of the switching events to design a Sparse Switching Event Recovering (SSER) method. By minimizing the total variation (TV) of the (sparse) event matrix, SSER can effectively recover the individual energy consumption values from the aggregated ones. To speed up the process, a Parallel Local Optimization Algorithm (PLOA) is proposed to solve the problem in active epochs of appliance activities in parallel. Using real-world trace data, we compare the performance of our method with that of the state-of-the-art solutions, including the popular Least Square Estimation (LSE) methods and a recently-developed machine learning method using iterative Hidden Markov Model (HMM). The results show that our approach has an overall better performance in both detection accuracy and overhead.

关键词： Home appliances Vectors Switches Hidden Markov models Accuracy Monitoring Energy consumption

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Preference Utility algorithm using GPGPU architecture

Preference Utility algorithm using GPGPU architecture

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2013 IEEE/ACIS 12th International Conference on computer and information science, ICIS 2013

作者： Hung, Che-Lun Wang, Hsiao-Hsi Yeh, Jieh-Shan Hu, Yu-Chen Lin, Chun-Yuan Lin, Yaw-Ling Dept. of Computer Science and Communication Engineering Providence University Taichung Taiwan Dept. of Computer Science and Information Management Providence University Taichung Taiwan Department of Computer Science and Information Engineering Chang Gung University Taoyuan Taiwan Dept. of Computer Science and Information Engineering Providence University Taichung Taiwan

ISBN: (纸本)9781479901746

Nowadays, with the explosive growth of the network technologies many new applications and services have been developed on Internet. World Wide Web can provide these services provided without the limitation of time and location. Obviously, the number of user is dramatically increasing from amount of the visitations of web pages. In our previous work, we proposed an algorithm to discover more significant information from visited web pages to provide this information to web designers or policy makers to adjust the presentation of their Web contents. However, this algorithm is time-consuming approach due to it needs to scan the whole database many times. Therefore, we propose a GPGPU-based Preference Utility algorithm to enhance the performance by GPGPU parallel model. The proposed algorithm is developed on NVIDIA CUDA architecture. The experimental results show that the proposed method can achieve about 7x times over CPU-based method. The proposed algorithm can used to mine the information from web log data efficiently. © 2013 IEEE.

关键词： Data mining

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Mining mobile application sequential patterns for usage prediction

Mining mobile application sequential patterns for usage pred...

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IEEE International Conference on Granular Computing (GRC)

作者： Eric Hsueh-Chan Lu Yi-Wei Lin Jing-Bin Ciou Department of Geomatics National Cheng Kung University Taiwan R.O.C. Dept. of Computer Science and Information Engineering National Taitung University Taiwan R.O.C.

In recent years, researches on smart phone services have received a lot of attention in both of the industry and academia due to a wide range of potential applications. Among them, one of popular topics is the mining and prediction of mobile application usage behaviors. In this paper, we propose a location-based approach to predict the mobile application usage behaviors. In this approach, we first discover the stay locations of the GPS movement data to obtain the mobile application usage database. Then, we consider both of the physical location moving paths and virtual application usage paths of users to mine the Mobile Application Sequential Patterns (MASPs) by the Mobile Application Sequential Pattern Mine (MASP-Mine) algorithm. Furthermore, a prediction strategy is designed to predict the next mobile application usage behaviors based on the MASPs. To our best knowledge, this is the first work on mining and prediction of mobile application usage behaviors with considerations of physical location moving paths and virtual application usage paths simultaneously. Through experimental evaluation under various condition settings by a real mobile application usage data, the proposed approach is shown to deliver excellent performance in terms of precision and recall.

关键词： Mobile communication Databases Smart phones Prediction algorithms Algorithm design and analysis Data mining Global Positioning System

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A tool for authoring programs that automatically distribute feedback to novice programmers

A tool for authoring programs that automatically distribute ...

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IEEE Symposium on Visual Languages and Human Centric Computing (VL/HCC)

作者： Michelle Ichinco Yoanna Dosouto Caitlin Kelleher Dept. of Computer Science and Engineering Washington University in St. Louis St. Louis MO USA School of Computing and Information Sciences Florida International University Miami FL USA

One way to provide feedback to independent novice programmers is by leveraging experienced programmers as code reviewers. To provide this feedback at a large scale, experienced programmers can author heuristic programs, or rules, that automatically determine whether a novice program should receive certain feedback. This work presents the lessons learned from designing a tool to enable rule authoring.

关键词： Educational institutions Programming Testing Programming environments Syntactics Standards Documentation

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Exploiting ILP, DLP, TLP, and MPI to accelerate matrix multiplication on Xeon processors

Exploiting ILP, DLP, TLP, and MPI to accelerate matrix multi...

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International Conference on engineering and Technology (ICET)

作者： Mostafa I. Soliman Fatma S. Ahmed Computers and Systems Section Electrical Engineering Dept. Aswan University Aswan Egypt Computer Science and Information Department Community College Taibah University Al-Madinah Al-Munawwarah Saudi Arabia

Matrix multiplication is one of the most important kernels used in the dense linear algebra codes. It is a computational intensive kernel that demands exploiting all available forms of parallelism to improve its performance. In this paper, ILP, DLP, TLP, and MPI are exploited to accelerate the execution of matrix multiplication on a cluster of computers with Intel Xeon processors. In addition, the Strassen's algorithm, which reduces the arithmetic operations of matrix multiplication from O(n 3 ) to O(n 2.807 ), is implemented using multi-threading, SIMD, blocking, and MPI techniques. Our results show that the average speedups of the traditional matrix multiplication algorithm on large matrices (from 6000×6000 to 9000×9000) are 14.9, 24.1, 24, 22.8 and 20.7 on 2, 4, 6, 8, and 10 computers, respectively. However, on the Strassen's algorithm, the average speedups are 3.9, 6.8, 6.8, and 10.3 on 2, 4, 6, and 7 computers, respectively, by applying the same parallel processing techniques.

关键词： Algebra

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A framework for rendering high resolution synthetic aperture radar images on heterogeneous architectures

A framework for rendering high resolution synthetic aperture...

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IEEE Symposium on computers and Communications (ISCC)

作者： William Chapman Sanjay Ranka Sartaj Sahni Mark Schmalz Linda Moore Bracy Elton Dept. of Computer Information Science and Engineering University of Florida Air Force Research Laboratory Wright Patterson Air Force Base High Performance Technologies Group Dynamics Research Corp.

This paper presents a modular, extensible, framework for rendering images from synthetic aperture radar (SAR) data on an array of heterogeneous processor architectures. Our design supports real-time reconstruction of a two-dimensional image from a matrix of echo pulses and their corresponding response values using Backprojection. Key to our design is the division of the Backprojection problem into atoms, which decomposes Backprojection along both it's input and output data dimensions, and allows scheduling algorithms to explicitly minimize communication overhead through the deliberate assignment of atoms to processors. Performance analysis on a cluster of 10 Tesla C2050 GPUs, and 5 Intel Xeon Processor X5650 CPUs has shown speedup that closely follows the number of processors in the cluster.

关键词： Throughput Synthetic aperture radar Round robin Dynamic range Rendering (computer graphics) Image resolution computer architecture

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