检索结果-内蒙古大学图书馆

IEEE Conference on Wireless Communications and Networking

作者： Sotiris Karachontzitis Stelios Timotheou Ioannis Krikidis Computer Engineering and Informatics Dept. University of Patras Greece Computer Technology Institute & Press “Diophantus” Greece Department of Electrical and Computer Engineering University of Cyprus Cyprus

This paper deals with the problem of sum rate maximization for a multiuser orthogonal frequency-division multiple access channel with secrecy rate constraints. We consider the case of a multiple-antenna base station (BS) and several single-antenna downlink receivers; a single secure user, a single eavesdropper and several normal users (without secrecy requirements). The eavesdropper intends to wiretap the message of the secure user and the BS aims to protect its transmission by appropriately scheduling normal users and enforcing spatial multiplexing between them and the secure user. A frequency (subchannel) and power allocation problem that aims to maximize the sum rate of the normal users, while a secrecy rate constraint is ensured for the secure user, is formulated. The resulting resource allocation problem is non-convex. Based on the dual problem and some well-defined transformations, we provide an iterative resource allocation algorithm with linear complexity with respect to the number of normal users and subchannels. In addition, two low-complexity solutions that are based on the decoupling of the subchannel and the power allocation subproblems, are investigated. Numerical results are provided to illustrate the performance of all the proposed solutions.

关键词： Resource management Optimization Tin Convergence Downlink OFDM Security

来源：评论

学校读者我要写书评

暂无评论

Multi-criteria Virtual Machines Migration Considering the Reconfiguration of Their Logical Topology

Multi-criteria Virtual Machines Migration Considering the Re...

引用

International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication Systems (MASCOTS)

作者： P. Kokkinos T.A. Varvarigou A. Kretsis E.A. Varvarigos Department of Electrical and Computer Engineering National Technical University of Athens Athens Greece Department of Computer Engineering and Informatics Computer Technology Institute and Press “Diophantus” Patras Greece

We present a methodology, called communication-aware virtual infrastructures (COMAVI), for the concurrent migration of multiple Virtual Machines (VMs) in cloud computing infrastructures, which aims at the optimum use of the available computational and network resources, by capturing the interdependencies between the communicating VMs. This methodology uses multiple criteria for selecting the VMs that will migrate, with different weights assigned to each of them. COMAVI also selects the computing sites/units where the migrating VMs will be hosted, by accounting for the way migration affects the logical (or virtual) topologies formed by the communicating VMs and viewing this selection as a logical topology reconfiguration problem. COMAVI resolves the maximum possible number of VM resource shortages, while tending to minimize the number of migrations performed, the induced network overhead, the logical topology reconfigurations required, and the corresponding service interruptions. We evaluate the proposed method through simulations, where we exhibit their performance benefits.

关键词： Topology Network topology Linear programming Vectors Bandwidth Virtual machining Wide area networks

来源：评论

学校读者我要写书评

暂无评论

Comparison of blind source separation algorithms for optical heart rate monitoring

Comparison of blind source separation algorithms for optical...

引用

EAI International Conference on Wireless Mobile Communication and Healthcare (Mobihealth)

作者： Eirini Christinaki Giorgos Giannakakis Franco Chiarugi Matthew Pediaditis Galateia Iatraki Dimitris Manousos Kostas Marias Manolis Tsiknakis Foundation for Research and Technology Institute of Computer Science Greece Computational Medicine Laboratory Institute of Computer Science Foundation for Research and Technology - Hellas Heraklion Crete Greece Department of Informatics Engineering Technological Educational Institute of Crete Greece

Monitoring of physiological signals of an individual via remote and contactless means is an important scientific challenge, whose resolution will enable the development of novel, non-intrusive mHealth and wellness-management systems and services. In this paper, the performance of three blind source separation algorithms for the optical estimation of the heart rate have been studied. The objective is to perform a comparative evaluation of their accuracy and convergence capability, for the optical estimation of the heart rate.

关键词： Cameras Heart rate Estimation Biomedical monitoring Source separation Optical pulses

来源：评论

学校读者我要写书评

暂无评论

GEN6 EU-project: Greek Pilot: 14

GEN6 EU-project: Greek Pilot:

引用

Proceedings of the 18th Panhellenic Conference on informatics

作者： A. Kretsis P. Kokkinos E. A. Varvarigos V. Nikolopoulos E. Gkioxi I. Hatzakis Department of Computer Engineering and Informatics University of Patras Greece Computer Technology Institute "Diophantus" Greece Intelen Advanced Engineering Division Cyprus Greek Research and Technology Network Greece

ISBN: (纸本)9781450328975

We present the results of the Greek pilot "IPv6 upgrade of Energy Efficiency in School Networks" [1], implemented in the context of the EU-sponsored project Governments ENabled with IPv6 (GEN6) [2]. The Greek pilot is part of a number of other European pilots (in Slovenia, Spain, Germany and Turkey) of the GEN6 project, which have the mission to validate and catalyze the deployment of IPv6 in the existing EU government infrastructures, services and applications. The Greek pilot, presented in this work has to do with the development, the installation and operation of an energy metering infrastructure in Greek Schools.

关键词： energy efficiency IPv6 networks energy metering system

来源：评论

学校读者我要写书评

暂无评论

Prediction and Robust Control of Energy Flow in Renewable Energy Systems

引用

IFAC Proceedings Volumes 2014年第3期47卷 3663-3669页

作者： Balázs Csanád Csáji András Kovács József Váncza Fraunhofer Project Center for Production Management & Informatics Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Hungary Budapest University of Technology and Economics Hungary

The paper is motivated by making use of solar energy in public lighting services via an intermediate battery storage. The aim is to develop algorithms for controlling the energy flow in the system, in such a way that robustness against power outages is guaranteed and the total energy cost is minimized. A novel approach is proposed which predicts energy production and consumption by fitting stochastic models to historic data, and solves the resulting optimization problem on a rolling horizon. Experimental results are also presented, illustrating the behavior of the controlled energy system in typical winter and summer days.

关键词： renewable energy systems robust control time-series analysis

来源：评论

学校读者我要写书评

暂无评论

ICEPOLE: High-speed, hardware-oriented authenticated encryption

Lecture Notes in Computer Science (including subseries Lectu...

引用

Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8731卷 392-413页

作者： Morawiecki, Pawel Gaj, Kris Homsirikamol, Ekawat Matusiewicz, Krystian Pieprzyk, Josef Rogawski, Marcin Srebrny, Marian Wójcik, Marcin Institute of Computer Science Polish Academy of Sciences Poland Section of Informatics University of Commerce Kielce Poland Department of Computing Macquarie University Australia Electrical Engineering and Computer Science School Queensland University of Technology Brisbane Australia Cryptographic Engineering Research Group George Mason University United States Cryptography and Information Security Group University of Bristol United Kingdom Cadence Design Systems San Jose United States Intel Gdańsk Poland

This paper introduces our dedicated authenticated encryption scheme ICEPOLE. ICEPOLE is a high-speed hardware-oriented scheme, suitable for high-throughput network nodes or generally any environment where specialized hardware (such as FPGAs or ASICs) can be used to provide high data processing rates. ICEPOLE-128 (the primary ICEPOLE variant) is very fast. On the modern FPGA device Virtex 6, a basic iterative architecture of ICEPOLE reaches 41 Gbits/s, which is over 10 times faster than the equivalent implementation of AES-128-GCM. The throughput-to-area ratio is also substantially better when compared to AES-128-GCM. We have carefully examined the security of the algorithm through a range of cryptanalytic techniques and our findings indicate that ICEPOLE offers high security level. © International Association for Cryptologic Research 2014.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

Comparison of Brain Network Models using Cross-Frequency Coupling and Attack Strategies

Comparison of Brain Network Models using Cross-Frequency Cou...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Marios Antonakakis Stavros I. Dimitriadis Michalis Zervakis Roozbeh Rezaie Abbas Babajani-Feremi Sifis Micheloyannis George Zouridakis Andrew C. Papanicolaou the Technical University of Crete Department of Electronic and Computer Engineering Akrotiri Campus Chania 73100 Greece the AIIA Laboratory Department of Informatics Aristotle University Thessaloniki 54124 Greece and the NeuroInformatics Group Aristotle University of Thessaloniki Greece Department of Pediatrics Division of Clinical Neurosciences University of Tennessee Health Science Center Memphis TN USA and the Neuroscience Institute Le Bonheur Children's Hospital Memphis TN USA. University of Crete Faculty of Medicine Greece Departments of Engineering Technology Computer Science and Electrical and Computer Engineering University of Houston Houston TX USA the Department of Neurobiology and Anatomy University of Tennessee Health Science Center Memphis TN USA

ISBN: (纸本)9781424492695

Several neuroimaging studies have suggested that functional brain connectivity networks exhibit "small-world" characteristics, whereas recent studies based on structural data have proposed a "rich-club" organization of brain networks, whereby hubs of high connection density tend to connect among themselves compared to nodes of lower density. In this study, we adopted an "attack strategy" to compare the rich-club and small-world organizations and identify the model that describes best the topology of brain connectivity. We hypothesized that the highest reduction in global efficiency caused by a targeted attack on each model's hubs would reveal the organization that better describes the topology of the underlying brain networks. We applied this approach to magnetoencephalographic data obtained at rest from neurologically intact controls and mild traumatic brain injury patients. Functional connectivity networks were computed using phase-to-amplitude cross-frequency coupling between the δ and β frequency bands. Our results suggest that resting state MEG connectivity networks follow a rich-club organization.

关键词： Comparison Attack Strategies lower density

来源：评论

学校读者我要写书评

暂无评论

On the prediction of EPON traffic using polynomial fitting in Optical Network Units

On the prediction of EPON traffic using polynomial fitting i...

引用

International Conference on Optical Communication Systems

作者： I. Mamounakis K. Yiannopoulos G. Papadimitriou E. Varvarigos Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute and Press “Diophantus” Patras Greece Department of Telecommunications Science and Technology University of Peloponnese Peloponnese Greece Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

We propose a traffic prediction algorithm that reduces the packets delay in Ethernet Passive Optical Networks (EPONs). The algorithm relies on Multi-Point Control Protocol (MPCP) message and traffic monitoring at the Optical Network Units (ONUs) and utilizes the monitoring information to predict the accumulated burst size using higher order least-mean-square polynomial approximations. The simulation of the algorithm shows that it achieves a delay improvement of over 30% without any further modification in the communication and bandwidth assignment procedure of the EPON.

关键词： Optical network units Bandwidth EPON IEEE 802.3 Standard Logic gates Prediction algorithms Channel allocation

来源：评论

学校读者我要写书评

暂无评论

ANALYSIS OF EMOTIONAL SPEECH USING AN ADAPTIVE SINUSOIDAL MODEL

ANALYSIS OF EMOTIONAL SPEECH USING AN ADAPTIVE SINUSOIDAL MO...

引用

European Signal Processing Conference

作者： George P. Kafentzis Theodora Yakoumaki Athanasios Mouchtaris Yannis Stylianou Multimedia Informatics Lab Computer Science Department University of Crete Institute of Computer Science Foundation for Research and Technology Hellas Toshiba Cambridge Research Lab

ISBN: (纸本)9781479946037

Processing of emotional (or expressive) speech has gained attention over recent years in the speech community due to its numerous applications. In this paper, an adaptive sinusoidal model (aSM), dubbed extended adaptive Quasi-Harmonic Model - eaQHM, is employed to analyze emotional speech in accurate, robust, continuous, time-varying parameters (amplitude, frequency, and phase). It is shown that these parameters can adequately and accurately represent emotional speech content. Using a well known database of narrowband expressive speech (SUSAS) we show that very high Signal-to-Reconstruction-Error Ratio (SRER) values can be obtained, compared to the standard sinusoidal model (SM). Formal listening tests on a smaller wideband speech database show that the eaQHM outperforms SM from a perceptual resynthesis quality point of view. Finally, preliminary emotion classification tests show that the parameters obtained from the adaptive model lead to a higher classification score, compared to the standard SM parameters.

关键词： Extended adaptive quasi-harmonic model Speech analysis Emotional speech Sinusoidal modelling Emotion classification

来源：评论

学校读者我要写书评

暂无评论

Nonlinear analysis: Optimization methods, convergence theory, and applications

Abstract and Applied Analysis

引用

Abstract and Applied Analysis 2015年第1期2015卷

作者： Yuan, Gonglin Yu, Gaohang Andrei, Neculai Xiao, Yunhai Zhang, Li College of Mathematics and Information Science Guangxi University Nanning Guangxi 530004 China School of Mathematics and Computer Sciences Gannan Normal University Ganzhou 341000 China Research Institute for Informatics (ICI) 8-10 Averescu Avenue Bucharest 71316 Romania College of Mathematics and Information Science Henan University Kaifeng 475000 China Department of Mathematics Changsha University of Science and Technology Changsha 410004 China

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：