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Nonminimum-phase channel equalization using all-pass CMA

Nonminimum-phase channel equalization using all-pass CMA

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2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013

作者： Blom, Koen C.H. Gerards, Marco E.T. Kokkeler, Ándre B.J. Smit, Gerard J.M. Dep. of Electrical Engineering Mathematics and Computer Science University of Twente P.O. Box 217 7500 AE Enschede Netherlands

ISBN: (纸本)9781467362351

A nonminimum-phase channel can always be decomposed into a minimum-phase part and an all-pass part. In our approach, called all-pass CMA, the dimensionality of the CMA algorithm has been reduced to improve blind equalization of a nonminimum-phase channel's all-pass part. The dimensionality reduction has been performed by parameterizing the CMA cost function in terms of the nonminimum-phase zero location of the all-pass part to be compensated. Currently, all-pass CMA can only compensate a single nonminimum-phase zero. However, compared to CMA, it typically provides a faster and more accurate compensation of this zero. © 2013 IEEE.

关键词： Blind equalization

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Static analysis of worst-case stack cache behavior 13

Static analysis of worst-case stack cache behavior

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21st International Conference on Real-Time Networks and Systems, RTNS 2013

作者： Jordan, Alexander Brandner, Florian Schoeberl, Martin Compilers and Languages Group Institute of Computer Languages Vienna University of Technology Austria Embedded Systems Engineering Section Dep. of Applied Mathematics and Computer Science Technical University of Denmark Denmark

ISBN: (纸本)9781450320580

Utilizing a stack cache in a real-time system can aid predictability by avoiding interference that heap memory traffic causes on the data cache. While loads and stores are guaranteed cache hits, explicit operations are responsible for managing the stack cache. The behavior of these operations can be analyzed statically. We present algorithms that derive worst-case bounds on the latency-inducing operations of the stack cache. Their results can be used by a static WCET tool. By breaking the analysis down into subproblems that solve intra-procedural data-flow analysis and path searches on the call-graph, the worst-case bounds can be efficiently yet precisely determined. Our evaluation using the MiBench benchmark suite shows that only 37% and 21% of potential stack cache operations actually store to and load from memory, respectively. Analysis times are modest, on average running between 0.46s and 1.30s per benchmark, dep.nding on the size of the stack cache. © 2013 ACM.

关键词： Real time systems

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Ubiquitous mobile instrumentation

Ubiquitous mobile instrumentation

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2013 ACM Conference on Ubiquitous Computing, UbiComp 2013

作者： Ferreira, Denzil Koehler, Christian Karapanos, Evangelos Kostakos, Vassilis Dep. Computer Science and Engineering University of Oulu Finland Human-Computer Interaction Institute Carnegie Mellon University United States Madeira Interactive Technologies Institute University of Madeira Portugal

ISBN: (纸本)9781450322157

Mobile phones allow us to reach people anywhere, at anytime. In addition to the benefits for end users, researchers and developers can also benefit from the powerful devices that participants carry on a daily basis. Collectively, mobile phones form a ubiquitous computer. Ubiquitous Mobile Instrumentation (UbiMI) workshop focuses on using mobile devices as instruments to collect data and conduct mobile user studies, to understand human-behavior, routines and gathering users' context. Copyright © 2013 ACM.

关键词： Cellular telephones

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Wavelet compression inspired implementation for high performances and low complexity ECG removal in wireless sEMG electrodes

Wavelet compression inspired implementation for high perform...

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Mohamed El Fares Djellatou Daniel Massicotte Mounir Boukadoum Dep. Electrical and Computer Engineering LSSI Dep. Computer Science Université du Québec à Montréal

This study addresses the removal of electrocardiogram pulses (ECG) from surface electromyography signals (sEMG) in wireless sEMG electrodes. We describe a wavelet-compression inspired filtering technique in order to minimize the computational complexity required in wireless sEMG electrodes while providing higher filtering performance than when with standard means. Using semi-artificially prepared signals, we show that the discrete wavelet transform (DWT) enables a partial separation between the sEMG and ECG signals in time domain. Then, only the highly overlapped parts are fed into an adaptive noise cancellation (ANC) structure for lower computational complexity filtering. The simulation results confirm the improved noise rejection and the gain in computational complexity obtained with the proposed method.

关键词： Discrete wavelet transforms Electrocardiography Finite impulse response filters Least squares approximations Signal processing algorithms Complexity theory

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Feature selection methods in persian sentiment analysis

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18th International Conference on Application of Natural Language to Information Systems, NLDB 2013

作者： Saraee, Mohamad Bagheri, Ayoub School of Computing Science and Engineering University of Salford Manchester United Kingdom Intelligent Database Data Mining and Bioinformatics Lab Electrical and Computer Engineering Dep. Isfahan University of Technology Isfahan Iran

ISBN: (纸本)9783642388231

With the enormous growth of digital content in internet, various types of online reviews such as product and movie reviews present a wealth of subjective information that can be very helpful for potential users. Sentiment analysis aims to use automated tools to detect subjective information from reviews. Up to now as there are few researches conducted on feature selection in sentiment analysis, there are very rare works for Persian sentiment analysis. This paper considers the problem of sentiment classification using different feature selection methods for online customer reviews in Persian language. Three of the challenges of Persian text are using of a wide variety of declensional suffixes, different word spacing and many informal or colloquial words. In this paper we study these challenges by proposing a model for sentiment classification of Persian review documents. The proposed model is based on stemming and feature selection and is employed Naive Bayes algorithm for classification. We evaluate the performance of the model on a collection of cellphone reviews, where the results show the effectiveness of the proposed approaches. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Feature Selection

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Image denoising based on overcomplete topographic sparse coding

Image denoising based on overcomplete topographic sparse cod...

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20th International Conference on Neural Information Processing, ICONIP 2013

作者： Zhao, Haohua Luo, Jun Huang, Zhiheng Nagumo, Takefumi Murayama, Jun Zhang, Liqing MOE-Microsoft Key Laboratory for Intelligent Computing and Intelligent Systems Dep. of Computer Science and Engineering Shanghai Jiao Tong Univ. Shanghai China SONY Corporation Tokyo Japan

ISBN: (纸本)9783642420504

This paper presents a novel image denoising framework using overcomplete topographic model. To adapt to the statistics of natural images, we impose sparseness constraints on the denoising model. Based on the overcomplete topographic model, our denoising system improves over previous work on the following aspects: multi-category based sparse coding, adaptive learning, local normalization, and shrinkage function. A large number of simulations have been performed to show the performance of the modified model, demonstrating that the proposed model achieves better denoising performance. © Springer-Verlag 2013.

关键词： Shrinkage

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Image Deblurring Using Fast Best Kernel Retrieval

Image Deblurring Using Fast Best Kernel Retrieval

引用

Asian Conference on Pattern Recognition (ACPR)

作者： Hui-Yu Huang Wei-Chang Tsai Dep. of Computer Science and Information Engineering National Formosa University Taiwan

In this paper, we propose a kernel estimation algorithm using fast best kernel retrieval (FBKR) from spectral irregularities to achieve the deblurring. In daily life, when people take a photograph by any kinds of camera equipment, image motion blur caused by camera motion often happens. Camera motion during exposure will produce a blurred image, this kind of blur is often non-liner mode. Motion blur always causes the decline of image quality, as long as the users using the hand-held photography equipment often have a similar experience. Based on this reason, reconstructing a clear image from blurred image is the main objective in this paper. Reconstruction is an ill-pose problem. In current motion blur estimation algorithms, these algorithms usually use the recursive method to estimate motion blur kernel. However, recursive process is quite time-consuming. In order to enhance time-consuming, in this paper, based on iterative phase retrieval algorithm and normalized sparsity measure, we propose a fast and effective blur kernel retrieval algorithm, which can find the best kernel in a short time. Experiments verify that our method can effectively reduce the execution time and obtain the best motion blur kernel to deblur a deblurred image and keep the quality of image deblurring.

关键词： Kernel Estimation Clustering algorithms Image reconstruction Algorithm design and analysis Image edge detection Cameras

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Physical layer security vs. network layer secrecy: Who wins on the untrusted two-way relay channel?

Physical layer security vs. network layer secrecy: Who wins ...

引用

IEEE International Workshop on computer-Aided Modeling, Analysis, and Design of Communication Links and Networks, CAMAD

作者： Johannes Richter Elke Franz Sabrina Engelmann Stefan Pfennig Eduard A. Jorswieck Dep. of Electrical Engineering and Information Technology/Communications Laboratory Dep. of Computer Science/Privacy and Data Security Technische Universität Dresden Dresden Germany

We consider the problem of secure communications in a Gaussian two-way relay network where two nodes exchange confidential messages only via an untrusted relay. The relay is assumed to be honest but curious, i.e., an eavesdropper that conforms to the system rules and applies the intended relaying scheme. We analyze the achievable secrecy rates by applying network coding on the physical layer or the network layer and compare the results in terms of complexity, overhead, and efficiency. Further, we discuss the advantages and disadvantages of the respective approaches.

关键词： Physical layer Relays Network coding Lattices Payloads Cryptography

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On Rapid Releases and Software Testing

On Rapid Releases and Software Testing

引用

International Conference on Software Maintenance (ICSM)

作者： Mika V. Mäntylä Foutse Khomh Bram Adams Emelie Engström Kai Petersen Dep. of Computer Science and Engineering Aalto University Finland SWAT-MCIS École Polytechnique de Montréal Ouébec Canada Dep. of Computer Science Lund University Sweden School of Computing Blekinge Institute of Technology

ISBN: (纸本)9781467352185

Large open and closed source organizations like Google, Facebook and Mozilla are migrating their products towards rapid releases. While this allows faster time-to-market and user feedback, it also implies less time for testing and bug fixing. Since initial research results indeed show that rapid releases fix proportionally less reported bugs than traditional releases, this paper investigates the changes in software testing effort after moving to rapid releases. We analyze the results of 312,502 execution runs of the 1,547 mostly manual system level test cases of Mozilla Fire fox from 2006 to 2012 (5 major traditional and 9 major rapid releases), and triangulated our findings with a Mozilla QA engineer. In rapid releases, testing has a narrower scope that enables deeper investigation of the features and regressions with the highest risk, while traditional releases run the whole test suite. Furthermore, rapid releases make it more difficult to build a large testing community, forcing Mozilla to increase contractor resources in order to sustain testing for rapid releases.

关键词： computer bugs Measurement Software Software testing Google Browsers

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HIP-IKEv2: A proposal to improve internet key exchange protocol-based on host identity protocol

HIP-IKEv2: A proposal to improve internet key exchange proto...

引用

3rd International Conference on Simulation and Modeling Methodologies, Technologies and Applications, SIMULTECH 2013

作者： Smaoui, S. Zarai, F. Obaidat, M.S. Hsiao, K.F. Kamoun, L. LETI laboratory University of Sfax Sfax Tunisia Computer Science and Software Engineering Department Monmouth University West Long Branch NJ 07764 United States Dep. of Information Management Ming-Chuan University Taoyuan County 333 Taiwan

ISBN: (纸本)9789898565693

IKEv2 offers authentication, authorization and key agreement services to establish a security association between two peers bound to IP addresses, but it is still vulnerable to some security problems such as denial of service (Dos) and man-in-the-middle attack. Host Identity Protocol (HIP) is also a security protocol that defines host identifiers for naming the endpoints and performs authentication and creation of IPsec security associations between them bound to identifiers. The purpose of HIP is to support trust systems, enhance mobility and greatly reduce the Denial of Service (Dos) attacks. We focus on an extension to IKEv2 in order to enhance authentication, eliminate man-in-the-middle attack and guarantee denial of service to provide better security between the two peers. In this paper, we describe our proposal that consists of combining the IKEv2 with the HIP to set up a security association based on two parameters which are location and Identity. This combination can provide better security properties than each protocol used alone. This scheme, named (HIP-IKEv2) couples location and identity to define a security association between two peers. We have used the Automated Validation of Internet Security Protocols and Applications (AVISPA) and its Security Protocol Animator (SPAN), and two powerful automated tools in order to formally specify and validate the HIP-IKEv2 protocol.

关键词： Authentication

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