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6th International Wireless Communications and Mobile Computing Conference, IWCMC 2010

作者： Huang, Huai-Sheng Chen, Yu-Jen Wu, Shih-Lin Chen, Jen-Jee Dpt. of Information Management Chang Gung University Kweishan Taoyuan Taiwan Dpt. of Computer Science and Imformation Engineering Chang Gung University Kweishan Taoyuan Taiwan Department of Computer Science National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781450300629

Power Saving Class (PSC) is an essential issue on IEEE 802.16-2009. In previous research, many algorithms had been proposed to reduce the consumption of power, but most of them only considered multiple connections in a Mobile Subscriber Station (MSS);in fact, it does not fit in with the situation of real world. On the contrary, others proposed algorithms considering the situation of multiple MSSs with multiple connections;nevertheless, it is difficult to increase the amount of MSSs. In this paper, we propose an efficient algorithm, which refers to both categories and avoids state transitions. When packet size is much smaller or delay bound is more loosening, the result shows that our scheduling algorithm can serve almost double multiple MSSs with multiple connections and still maintain high sleep ratio for energy efficiency. Copyright © 2010 ACM.

关键词： Scheduling algorithms

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Subdividing triangular and quadrilateral meshes in parallel to approximate curved geometries

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Procedia engineering 2017年 203卷 310-322页

作者： A. Gargallo-Peiró G. Houzeaux X. Roca Computer Applications in Science and Engineering Dpt. Barcelona Supercomputing Center-Centro Nacional de Supercomputación C/ Jordi Girona 29 Barcelona 08034 Spain

A parallel distributed approach to refine a mesh while preserving the curvature of a target geometry is presented. Our approach starts by generating a coarse linear mesh of the computational domain. Second, the former coarse mesh is curved to match the curvature of the target geometry. Then, the curved mesh is partitioned and the subdomain meshes are sent to the slaves. Finally, the curved elements are uniformly subdivided in parallel targeting the geometry approximated by the curved mesh. The result is a distributed finer linear mesh featuring improved geometric accuracy. The key ingredient of our implementation is to approximate the target geometry as a linear mesh equipped with an elemental field corresponding to an element-wise polynomial geometry representation. Thus, the distribution of the curved geometry is equivalent to partitioning the linear mesh and sending the subdomain meshes and the elemental fields to the slaves. The main application of the obtained finer linear mesh is to compute in parallel steady state flow solutions on real topographies. The qualitative results show that for 2D and 3D steady state flow solutions, on real and synthetic topographies, our parallel subdivision approach mitigates the artificial artifacts that might appear with standard straight-sided subdivision methods. We also check the parallel performance of the implementation by performing a weak scalability test in 2D.

关键词： Mesh subdivision Mesh multiplication Parallel mesh generation Parallel computing High-order mesh

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Miniaturized multi-band stopband filter using circular split ring resonator and null gap separations between all parallel lines

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Progress In Electromagnetics Research C 2020年 106卷 137-150页

作者： Ahmed, Badiaa Ait Aghzout, Otman Naghar, Azzeddin Alejos, Ana V. Dpt. of Computer Science Engineering SIGL-Lab. ENSA University of Abdelmalek Essaadi Tétouan Morocco BSA-Innovation LAB Radio Frequency Systems RFS Lannion France Dpt. of Signal Theory and communications University of Vigo Pontevedra Spain

This paper presents a new multi-band stopband filter loaded by a shorted metamaterial circuit. Firstly, two filters loaded by stubs and open ring resonators (ORRs) are studied and compared. The ORRs allow more effects in terms of miniaturization by a shifting toward low frequencies and rejection bandwidth (57.34%). To improve the filter efficiency, coupled split ring resonators (SRRs) are used. The final filter is characterized by a miniaturized size of 18.840 mm2, wide rejection bandwidth, high selectivity level, and multiple resonances over S, C, X, and Ku bands. L-C equivalent circuit model filter and other characteristics are investigated. A prototype of the filter with coupled SRRs has been fabricated and measured. Good matching among EM-simulation, equivalent circuit modelling, and measured results are achieved. © 2020, Electromagnetics Academy. All rights reserved.

关键词： Circuit simulation

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Fake News, Disinformation, and Deepfakes: Leveraging Distributed Ledger Technologies and Blockchain to Combat Digital Deception and Counterfeit Reality

arXiv

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arXiv 2019年

作者： Fraga-Lamas, Paula Fernández-Caramés, Tiago M. Dpt. of Computer Engineering Centro de investigación CITIC Faculty of Computer Science Universidade da Coruña A Coruña15071 Spain

The rise of ubiquitous deepfakes, misinformation, disinformation and post-truth, often referred to as fake news, raises concerns over the role of Internet and social media in modern democratic societies. Due to its rapid and widespread diffusion, digital deception has not only an individual or societal cost, but it can lead to significant economic losses or to risks to national security. Blockchain and other Distributed Ledger Technologies (DLTs) guarantee the provenance and traceability of data by providing a transparent, immutable and verifiable record of transactions while creating a peer-to-peer secure platform for storing and exchanging information. This overview aims to explore the potential of DLTs to combat digital deception, describing the most relevant applications and identifying their main open challenges. Moreover, some recommendations are enumerated to guide future researchers on issues that will have to be tackled to strengthen the resilience against cyber-threats on today's online media. Copyright © 2019, The Authors. All rights reserved.

关键词： Cybersecurity

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X-Ray fluorescence image super-resolution using dictionary learning

X-Ray fluorescence image super-resolution using dictionary l...

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IEEE IVMSP Workshop

作者： Qiqin Dai Emeline Pouyet Oliver Cossairt Marc Walton Francesca Casadio Aggelos Katsaggelos Dpt. of Electrical Engineering and Computer Science Northwestern University Center for Scientific Studies in the Arts (NU-ACCESS) Northwestern University

ISBN: (纸本)9781509019304

X-Ray fluorescence (XRF) scanning of works of art is becoming an increasingly popular non-destructive analytical method. The high quality XRF spectra is necessary to obtain significant information on both major and minor elements used for characterization and provenance analysis. However, there is a trade-off between the spatial resolution of an XRF scan and the Signal-to-Noise Ratio (SNR) of each pixel's spectrum, due to the limited scanning time. In this paper, we propose an XRF image super-resolution method to address this trade-off, thus obtaining a high spatial resolution XRF scan with high SNR. We use a sparse representation of each pixel using a dictionary trained from the spectrum samples of the image, while imposing a spatial smoothness constraint on the sparse coefficients. We then increase the spatial resolution of the sparse coefficient map using a conventional super-resolution method. Finally the high spatial resolution XRF image is reconstructed by the high spatial resolution sparse coefficient map and the trained spectrum dictionary.

关键词： Dictionaries Spatial resolution Image reconstruction Mathematical model Signal resolution Signal to noise ratio

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Mercury: Combining Performance with Dependability Using Self-virtualization

Mercury: Combining Performance with Dependability Using Self...

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International Conference on Parallel Processing (ICPP)

作者： Haibo Chen Rong Chen Fengzhe Zhang Binyu Zang Pen-Chung Yew Parallel Processing Institute Fudan University China Dpt. of Computer Science and Engineering University of Minnesota Twin-Cities USA

There has recently been increasing interests in using system virtualization to improve the dependability of HPC cluster systems. However, it is not cost-free and may come with some performance degradation, uncertain QoS and loss of functionalities. Meanwhile, many virtualization-enabled features such as online maintenance and fault tolerance do not require virtualization being always on. This paper proposes a technique, called self-virtualization, that supports dynamically attaching and detaching a full-fledged virtual machine monitor (VMM) beneath an operating system, without disturbing applications thereon, and rid the system of potential overhead when the virtualization is not needed. This technique enables HPC clusters to reap most benefits from virtualization without sacrificing performance. This paper presents the design and implementation of Mercury, a working prototype based on Linux and Xen VMM. Our performance measurement shows that Mercury incurs very little overhead: about 0.2 ms to complete a mode switch, and negligible performance degradation compared to Linux.

关键词： Degradation Linux Switches Performance loss Fault tolerance Joining processes Virtual machine monitors Operating systems Application virtualization Prototypes

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Different approach to build an uninterruptible power supply system with power factor correction

International Power Electronics Congress - CIEP

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International Power Electronics Congress - CIEP 1998年 119-124页

作者： Vázquez, N. Aguilar, C. Alvarez, J. Cáceres, R. Barbi, I. Arau, J. Inst. Tecnológico de Celaya Computer Science Dpt. Celaya Mexico CENIDET Electronics Engineering Dpt. Cuernavaca Mexico CINVESTAV-IPN Electrical Engineering Dpt. Mexico D.F. Mexico Federal University of Santa Catarina Power Electronics Institute Florianópolis -SC Brazil

In this paper a different approach to build an uninterruptible power supply (UPS) system is presented. The proposed scheme includes features such as high power factor, low total harmonic distortion and good dynamic response at the output voltage. This scheme has the desirable features of high efficiency, simple circuit and low cost compared to a traditional standalone multiple stages UPS with power factor correction. The circuit operation, analysis and experimental results of the proposed UPS scheme are presented. The UPS approach is a good solution for low power applications (&le 500 W).

关键词： Uninterruptible power systems

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A review of sentiment computation methods with R packages

arXiv

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arXiv 2019年

作者： Naldi, Maurizio University of Rome Tor Vergata Dpt. of Civil Engineering and Computer Science Via del Politecnico 1 Rome00133 Italy

Four packages in R are analyzed to carry out sentiment analysis. All packages allow to define custom dictionaries. Just one - SentimentR - properly accounts for the presence of negators. Copyright © 2019, The Aut... 详细信息

关键词： Sentiment analysis

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Automatic video colorization using 3d conditional generative adversarial networks

arXiv

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arXiv 2019年

作者： Kouzouglidis, Panagiotis Sfikas, Giorgos Nikou, Christophoros Dpt. of Computer Science and Engineering University of Ioannina Ioannina45110 Greece Information Technologies Institute CERTH Thessaloniki57001 Greece

In this work, we present a method for automatic colorization of grayscale videos. The core of the method is a Generative Adversarial Network that is trained and tested on sequences of frames in a sliding window manner. Network convolutional and deconvolutional layers are three-dimensional, with frame height, width and time as the dimensions taken into account. Multiple chrominance estimates per frame are aggregated and combined with available luminance information to recreate a colored sequence. Colorization trials are run succesfully on a dataset of old black-and-white films. The usefulness of our method is also validated with numerical results, computed with a newly proposed metric that measures colorization consistency over a frame sequence. Copyright © 2019, The Authors. All rights reserved.

关键词： Convolution

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Thematic labeling of Twitter accounts using DBpedia properties

Thematic labeling of Twitter accounts using DBpedia properti...

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International Workshop on Semantic Media Adaptation and Personalization (SMAP)

作者： Gerasimos Razis Ioannis Anagnostopoulos Petr Saloun Computer Science and Biomedical Informatics Dpt. University of Thessaly Lamia Greece Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Czech Republic

ISBN: (纸本)9781509052479

In this paper, we propose an iterative algorithm towards the automatic labeling of Twitter accounts in respect to thematic categories derived from DBpedia properties. We describe the rationale behind the selection of these thematic categories, and discuss their evaluation assessment. Finally, we propose and analyze two generic and adaptable methodologies for discovering the necessary linked data resources for further enhancing the thematic description of Twitter accounts.

关键词： Twitter Labeling Measurement Classification algorithms Tagging Semantics Algorithm design and analysis

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