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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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Comparision of multi-carrier techniques in seven-level asymmetric cascade multilevel inverter

Comparision of multi-carrier techniques in seven-level asymm...

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2013 4th International Conference on Power engineering, Energy and Electrical Drives, POWERENG 2013

作者： Colak, Ilhami Kabalci, Ersan Keven, Gokhan Faculty of Technology Department of Electric and Electronic Engineering Gazi University Ankara Turkey Faculty of Engineering and Architecture Dep. of Electrical and Electronic Eng. Nevsehir University Nevsehir Turkey Vocational College of Haci Bektaş Veli Dep. of Computer Programming Nevsehir University Nevsehir Turkey

ISBN: (纸本)9781467363921

The multilevel inverters (MLIs) are classified into three topologies such as Diode Clamped, Flying Capacitor and Cascade Multilevel Inverter (CMLI). CMLI topologies include two kind of structure that is named symmetric and asymmetric topologies. Asymmetric Cascade MLI (ACMLI) topologies consist of unequal DC sources. Many modulation techniques have been used in ACMLI topology such as Multi-Carrier PWM (MC-PWM), Space Vector PWM and Selective Harmonic PWM. The MC-PWM technique is achieved by four different types. In this study, MC-PWM techniques which are named Phase Disposition PWM, Phase Opposition Disposition PWM, Alternate Phase Opposition Disposition PWM and Phase Shifted PWM have been compared. It is uncovered that Phase Opposition Disposition PWM technique is more convenient in terms of Total Harmonic Distortion of output voltage and current signals and in terms of the quality of power factor in ACMLI which is performed in this study. © 2013 IEEE.

关键词： Pulse width modulation

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Summary abstract for the 2nd ACM international workshop on multimedia analysis for ecological data 13

Summary abstract for the 2nd ACM international workshop on m...

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21st ACM International Conference on Multimedia, MM 2013

作者： Spampinato, Concetto Mezaris, Vasileios Van Ossenbruggen, Jacco Dep. of Electrical Electronics and Computer Engineering University of Catania 95125 Catania Italy Centre for Research and Technology Hellas Information Technologies Inst. Thermi 57001 Greece Centrum Wiskunde and Informatica 1098 XG Amsterdam NL Netherlands

ISBN: (纸本)9781450324045

The 2nd ACM InternationalWorkshop on Multimedia Analysis for Ecological Data (MAED'13) is held as part of ACM Multimedia 2013. MAED'13, following the first workshop of the MAED series (MAED'12) that was held as part of ACM Multimedia 2012, is concerned with the processing, inter- pretation, and visualization of ecology-related multimedia content with the aim to support biologists in their investi- gations for analyzing and monitoring natural environments. Copyright © 2013 ACM.

关键词： Ecology

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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 Deblurring Using Fast Best Kernel Retrieval

Image Deblurring Using Fast Best Kernel Retrieval

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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 ...

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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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Application of evolutionary algorithms to maximum lifetime coverage problem in wireless sensor networks

Application of evolutionary algorithms to maximum lifetime c...

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2013 IEEE 37th Annual computer Software and Applications Conference, COMPSAC 2013

作者： Tretyakova, Antonina Seredynski, Franciszek Polish-Japanese Institute of Information Technology Warsaw Poland Dep. of Mathematics and Natural Sciences Cardinal Stefan Wyszynski University Warsaw Poland Computer Science Department Siedlce University of Natural Sciences and Humanities Siedlce Poland

ISBN: (纸本)9780769549798

The paper analyzes three recently proposed algorithms, which differ not only in the method of finding solution to the Maximum Lifetime Coverage problem in Wireless Sensor Networks (WSN), but also approaches to a statement of the problem. In order to compare algorithms: (1) they were adapted to the common assumptions that correspond to real characteristics of sensor networks and (2) special sensor network simulator was used to study the algorithms. The paper presents the results of an experimental study and shows how the lifetime of WSN dep.nds on a different set of algorithms parameters and WSNs parameters. Based on the results of the experiments, conclusions about the validity of the assumptions of algorithms, quality of solutions and possible improvements are drawn. © 2013 IEEE.

关键词： Wireless sensor networks

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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...

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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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Biometric iris image acquisition system with wavefront coding technology

Biometric iris image acquisition system with wavefront codin...

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5th International Symposium on Photoelectronic Detection and Imaging, ISPDI 2013

作者： Hsieh, Sheng-Hsun Yang, Hsi-Wen Huang, Shao-Hung Li, Yung-Hui Tien, Chung-Hao Dep. of Photonics National Chiao Tung Univ. 1001 University Rd. Hsinchu 300 Taiwan Dept. of Information Engineering and Computer Science Feng Chia Univ. 100 Wenhwa Rd. Seatwen Taichung 407 Taiwan

ISBN: (纸本)9780819497765

Biometric signatures for identity recognition have been practiced for centuries. Basically, the personal attributes used for a biometric identification system can be classified into two areas: one is based on physiological attributes, such as DNA, facial features, retinal vasculature, fingerprint, hand geometry, iris texture and so on;the other scenario is dep.ndent on the individual behavioral attributes, such as signature, keystroke, voice and gait style. Among these features, iris recognition is one of the most attractive approaches due to its nature of randomness, texture stability over a life time, high entropy density and non-invasive acquisition. While the performance of iris recognition on high quality image is well investigated, not too many studies addressed that how iris recognition performs subject to non-ideal image data, especially when the data is acquired in challenging conditions, such as long working distance, dynamical movement of subjects, uncontrolled illumination conditions and so on. There are three main contributions in this paper. Firstly, the optical system parameters, such as magnification and field of view, was optimally designed through the first-order optics. Secondly, the irradiance constraints was derived by optical conservation theorem. Through the relationship between the subject and the detector, we could estimate the limitation of working distance when the camera lens and CCD sensor were known. The working distance is set to 3m in our system with pupil diameter 86mm and CCD irradiance 0.3mW/cm2. Finally, We employed a hybrid scheme combining eye tracking with pan and tilt system, wavefront coding technology, filter optimization and post signal recognition to implement a robust iris recognition system in dynamic operation. The blurred image was restored to ensure recognition accuracy over 3m working distance with 400mm focal length and aperture F/6.3 optics. The simulation result as well as experiment validates the proposed code ap

关键词： Image reconstruction

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Message from the MAED'13 workshop chairs

MAED 2013 - Proceedings of the 2nd ACM International Worksho...

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MAED 2013 - Proceedings of the 2nd ACM International Workshop on Multimedia Analysis for Ecological Data 2013年 iii页

作者： Spampinato, Concetto Mezaris, Vasileios Van Ossenbruggen, Jacco Dep. of Electrical Electronics and Computer Engineering University of Catania Italy Centre for Research and Technology Hellas Information Technologies Institute Greece Centrum Wiskunde and Informatica Netherlands

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