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检索条件"机构=Dep. of Engineering and Computer Science"

共 616 条记录，以下是401-410 订阅

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EVALUATION OF CONTEXT MODELS TO CODE WAVELET-TRANSFORMED HYPERSPECTRAL IMAGES

EVALUATION OF CONTEXT MODELS TO CODE WAVELET-TRANSFORMED HYP...

引用

IEEE International Conference on Image Processing

作者： Francesc Auli-Llinas Pablo Enfedaque Joan Serra-Sagrista Victor Sanchez Dep. of Information and Communications Engineering Universitat Autonoma de Barcelona Dep. of Computer Science University of Warwick

ISBN: (纸本)9781479957521

Context modeling is key in wavelet-based image coding schemes to achieve competitive coding performance. Commonly, context models are devised for a particular coding system and are employed for many different types of images. The aim of this work is to evaluate the suitability of three well-known context models for coding hyperspectral images, without focusing on a particular wavelet-based coding system. To do so, an entropy-based measure defined using the mechanisms utilized by modern image codecs is employed. The experimental results assess the appropriateness of the context models considering different coding rates and transform strategies. They reveal that some widely-used context models may not be as adequate as it is generally thought. The hints provided by this analysis may help to design simpler and more efficient wavelet-based codecs for hyperspectral images.

关键词： Image coding Context models Wavelet transform

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Intrusion-tolerant Jini service architecture for ensuring survivability of U-services based on WSN

Intrusion-tolerant Jini service architecture for ensuring su...

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4th International Conference on Mobile, Ubiquitous, and Intelligent Computing, MUSIC 2013

作者： Kim, Sung-Ki Choi, Jae-Yeong Kim, Byung-Gyu Min, Byoung-Joon Division of IT Education Sun Moon University 100 Kalsan-ri Tangjeong-myeon Asan-si 336-708 Korea Republic of Dep. of Computer Science and Engineering Sun Moon University 100 Kalsan-ri Tangjeong-myeon Asan-si 336-708 Korea Republic of Dep. of Computer Science and Engineering Incheon National University 119 Academy-ro Yeonsu-gu Incheon 406-772 Korea Republic of

ISBN: (纸本)9783642406744

U-Service environment based on WSN(Wireless Sensor Network) is poor in reliability of connection and has a high probability that the intrusion and the system failure may occur. Therefore, it is very important to ensure that the legitimate users make use of trustable services without discontinuance or obstacle of the services they are enjoying despite the presence of failures and intrusions. In this paper, we propose an intrusion-tolerant Jini service architecture integrating security and survivability mechanisms in order to provide end users with Jini services having a persistent state in wireless sensor networks. The proposed architecture is able to protect a Jini system not only from faults such as network partitioning or server crash, but also from attacks exploiting flaws. It is designed to provide performance enough to show a low response latency so as to support seamless service usage. Through the experiment on a test-bed, we have confirmed that the architecture is able to provide high security and availability at the level that the degradation of services quality is ignorable. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Wireless sensor networks

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Geometric model for vision-based door detection

Geometric model for vision-based door detection

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International Conference on computer engineering and Systems

作者： Marwa M. Shalaby Mohammed A.-Megeed Salem Alaa Khamis Farid Melgani Dep. of Mechatronics German University in Cairo Egypt Dep. of Scientific Computing Ain Shams University Cairo Egypt Engineering Science Dep. Suez University Egypt Information Engineering & Computer Science Dep. University of Trento Italy

Emerging assistive technologies, such as assistive domotics and socially assistive robots have considerable potential for enhancing the lives of many elderly and physically challenged people throughout the world. Blind and visually impaired people can use these technologies for many tasks recognizing objects, handling various household duties, navigation in indoor and outdoor environments. Door detection is one of the important issues in indoor navigation. This paper presents a novel vision-based door detection technique. It is based on the geometric properties of the 4-side polygon. The efficacy of the proposed method is tested using large database of images with different levels of complexity. The experimental results show the robustness of the proposed method against changes in colors, sizes, shapes, orientations, and textures of the door. Detection rate of 83% with relatively low false positive rate for simple images is achieved. This proposed algorithm is suitable for real-time, portable applications where it only requires one digital camera and low computational resources.

关键词： Image edge detection Navigation Feature extraction Data preprocessing

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The development of a multi-piecewise-based thinning description method

The development of a multi-piecewise-based thinning descript...

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IEEE International Symposium on Indep.ndent Computing (ISIC)

作者： Wen-Chang Cheng Dep. of Computer Science and Information Engineering Chaoyang University of Technology Taiwan

ISBN: (纸本)9781479944750

In this study, we proposed a multi-piecewise thinning description method. Thinning is a preprocessing technology often applied in the fields of binary image processing; it is used to transform thick elements in an image into lines with a single pixel width. Because lines include closed and open lines, an effective description method is required for post-processing procedures. Regarding the proposed method, branch points of thinning lines are first identified and used as a basis for segmenting the lines, which are originally connected, into multiple line segments. Subsequently, we employed the find contour function available in the OpenCV library to describe the coordinates of the contours of the line segments. The starting and endpoints of closed lines can be directly obtained using the contour results of closed lines. By contrast, the starting and endpoints of open lines are achieved by first using turning points to confirm the position of line-end points and employing the adjacent pixels of the line-end and branch points before the contour results of open lines can be used. The experimental results indicated that the proposed method effectively achieved accurate descriptions for thinned lines.

关键词： Algorithm design and analysis Image segmentation Turning Shape Fingerprint recognition computer science

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Supporting Regression Test Scoping with Visual Analytics

Supporting Regression Test Scoping with Visual Analytics

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International Conference on Software Testing, Verification, and Validation, ICST

作者： Emelie Engström Mika Mantylä Per Runeson Markus Borg Dept. of Computer Science Lund University Sweden Dep. of Computer Science and Engineering Aalto University Finland

Background: Test managers have to repeatedly select test cases for test activities during evolution of large software systems. Researchers have widely studied automated test scoping, but have not fully investigated decision support with human interaction. We previously proposed the introduction of visual analytics for this purpose. Aim: In this empirical study we investigate how to design such decision support. Method: We explored the use of visual analytics using heat maps of historical test data for test scoping support by letting test managers evaluate prototype visualizations in three focus groups with in total nine industrial test experts. Results: All test managers in the study found the visual analytics useful for supporting test planning. However, our results show that different tasks and contexts require different types of visualizations. Conclusion: Important properties for test planning support are: ability to overview testing from different perspectives, ability to filter and zoom to compare subsets of the testing with respect to various attributes and the ability to manipulate the subset under analysis by selecting and deselecting test cases. Our results may be used to support the introduction of visual test analytics in practice.

关键词： Data visualization Testing Software Organizations Visualization Prototypes Context

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An error-floor reduction technique for short-length LT codes

An error-floor reduction technique for short-length LT codes

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International Symposium on Information Theory and Its Applications, ISITA

作者： Li-Jen Chang Chung-Hsuan Wang John K. Zao Dep. of Electrical and Computer Engineering National Chiao Tung University Hsinchu Taiwan Dep. of Computer Science National Chiao Tung University Hsinchu Taiwan

Luby transform (LT) codes are often employed during best-effort packet transfers to offer rateless erasure protection. Efficient as they are, these randomized codes with a small number of input symbols often post an inevitable performance trade-off between the decoding failure rates in their waterfall and error-floor regions. In order to surmount this trade-off, we propose a new encoding strategy that requires a portion of the high-degree output symbols of an LT code to abandon the conventional equally-probable input selection strategy; instead, connect themselves to some specially selected low-degree input symbols. Our simulation results show that short-length LT codes with merely 10 3 input symbols yield significantly lower symbol/block failure rates at a small overhead of reception as they employ the proposed strategy. These performance-enhanced rateless codes can have potential applications in real-time multimedia broadcasting.

关键词： Decoding Complexity theory Superluminescent diodes

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Adaptive block SSA based ANC implementation for high performances ECG removal from sEMG signals

Adaptive block SSA based ANC implementation for high perform...

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Canadian Conference on Electrical and computer engineering (CCECE)

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

This study addresses electrocardiogram (ECG) pulses removal from surface electromyography (sEMG) recordings. We describe a block singular spectrum analysis based adaptive noise canceler (BSSA-ANC) in order to enhance the filtering performance of sEMG signals. The proposed method distinguishes itself by adapting the eigenvalues of every input block data, using an adaptive noise canceling (ANC) filter based on error gradient minimization, during the grouping stage of the well-known SSA technique. Using semi-artificially prepared signals, we demonstrate that the least mean square (LMS) when combined with the proposed technique provides higher filtering performances than with standard mean. The simulation results using real world data confirm the improved noise rejection obtained with the proposed method.

关键词： Least squares approximations Electrocardiography Filtering Coherence Noise Trajectory Signal processing algorithms

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A SCTP-based authentication protocol: SCTPAP 5

A SCTP-based authentication protocol: SCTPAP

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5th International Conference on Data Communication Networking, DCNET 2014 - Part of 11th International Joint Conference on e-Business and Telecommunications, ICETE 2014

作者： Rekik, Malek Meddeb-Makhlouf, Amel Zarai, Faouzi Obaidat, Mohammad S. Hsiao, K.F. LETI laboratory University of Sfax Tunisia Computer Science and Software Engineering Department Monmouth University NJ07764 United States Dep. of Information Management Ming-Chuan University Taoyuan County333 Taiwan

ISBN: (纸本)9789897580420

Multihoming is among the features of SCTP (Stream Control Transmission Protocol), which makes it more robust and efficient than TCP(Transmission Control Protocol)but more vulnerable under attack. Nevertheless, a strong security can degrade the QoS(Quality of Service) by adding additional delay. Therefore, we propose in this paper, a secure authentication protocol that supports the establishment of multiple connections to protect multihoming networks with the least number of messages, number of parameters in each message and number of communicating nodes. The proposed scheme provides lower delay of authentication and protects against several attacks. Our devised protocol is analyzed using SPAN (Security Protocol Animator) for AVISPA (Automated Validation of Internet Security Protocols and Applications) tool. The obtained validation results show that the scheme is safe. Copyright © 2014 SCITEPRESS - science and Technology Publications.

关键词： Authentication

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Time Frequency noise canceller for an optimized separation of the ECG from low back sEMG signals

Time Frequency noise canceller for an optimized separation o...

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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

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

This work describes a hybrid adaptive filtering technique, designed to optimize the removal of the electrocardiogram (ECG) from surface electromyography (sEMG) recordings. Using the adaptive noise cancellation technique (ANC), we minimize the error gradient based on combined Time-Frequency filtering enhancements. The validation on artificially prepared signals with a real data basis shows better frequency and time filtering performances in comparison to simulations with standard implementations.

关键词： Filtering Electrocardiography Time-frequency analysis Adaptive filters Vectors Coherence Electromyography

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PIPeR: Impact of power-awareness on social-based opportunistic advertising

PIPeR: Impact of power-awareness on social-based opportunist...

引用

IEEE Conference on Wireless Communications and Networking

作者： Soumaia Al Ayyat Sherif G. Aly Khaled A. Harras Computer Science and Engineering Dep. The American University in Cairo Cairo Egypt School of Computer Science Carnegie Mellon University Qatar Doha Qatar

ISBN: (纸本)9781479930845

Interest and social-awareness can be valuable determinants in decisions related to content delivery in mobile environments. Under certain conditions, we can deliver content with less cost and better delivery ratios, while only involving users that are interested in the type of content being delivered. However, the dep.etion of valuable power resources poses a deterrent to node participation in such interest-aware forwarding systems. No significant research contribution has been identified to collectively maximize the benefits of social, interest, and power awareness. In this work, we propose a new algorithm called PIPeR which integrates power awareness with an interest and socially aware forwarding algorithm called IPeR. Through simulations, we present and evaluate four modes of PIPeR. The results show that PIPeR is more fair and preserves at least 22% of the power IPeR consumes with less delay, while relying significantly on interested forwarders and with comparable cost to maintain similar delivery ratios.

关键词： Batteries Routing protocols Communities Delays Mobile nodes

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