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Optimal power allocation for minimizing visual distortion over MIMO communication systems

Optimal power allocation for minimizing visual distortion ov...

引用

2009 IEEE International Conference on Image Processing, ICIP 2009

作者： Park, Jincheol Jang, Uk Oh, Taegeun Lee, Sanghoon Bovik, Alan C. Wireless Network Lab. Center for IT Yonsei University Seoul 120-749 Korea Republic of Taejeon 305-700 Korea Republic of Department of Electrical and Computer Engineering University of Texas at Austin Austin TX United States

ISBN: (纸本)9781424456543

A recent dynamic increase in demand for wireless multimedia services has greatly accelerated the research on cross layer optimization techniques for transmitting multimedia data over wireless channel. In this paper, we explore a novel theoretical approach for joint optimization between the rate distortion (RD) of H.264/AVC video and the link-capacity of MIMO parallel subchannels. We obtain the optimal power level of subchannels through an optimization problem to minimize total visual distortion. In the simulation results, compared to the water filling (WF) method, the proposed scheme provides better results in aspects of visual quality in the face of sum rate loss. ©2009 IEEE.

关键词： Signal distortion

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The DCM-based web information filtering algorithm and its application

The DCM-based web information filtering algorithm and its ap...

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2009 International Workshop on Intelligent Systems and Applications, ISA 2009

作者： Luo, Chang-Ri Zhang, Fan Zhang, Xin-Hua School of Network Education Central China Normal University Wuhan 430079 China Information Management Department of Central China Normal University Wuhan 430079 China Computer Application and Engineering Department Wuhan Vocational College of Software and Engineerring Wuhan 430205 China

ISBN: (纸本)9781424438945

In the past few years, as the volume of junk information on the internet has grown tremendously, researchers' begun to handle this issue. In this paper, an algorithm, called DCM (Discriminative Category Matching) algorithm is employed to do the content based information filtering system design. To our knowledge, the algorithm is the first introduced into filtering information on the internet. System test results indicate that the algorithm can be used to filter information with high accuracy and low computational cost and storage requirement. Therefore, it is suitable for online information filtering in practice. © 2009 IEEE.

关键词： Information filtering

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Communication-aware target tracking using navigation functions - Centralized case

Communication-aware target tracking using navigation functio...

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International Conference on Robot Communication and Coordination, ROBOCOMM

作者： Alireza Ghaffarkhah Yasamin Mostofi Cooperative Network Lab Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA

In this paper we consider a team of robots that are tasked with tracking a moving target cooperatively, while maintaining their connectivity to a base station and avoiding collision. We propose a novel extension of the classical navigation function framework in order to ensure task completion. More specifically, we modify the classical definition of the navigation functions to (1) incorporate measures of link qualities and (2) include the impact of a time-varying objective. Our proposed communication-aware navigation function framework is aimed at maintaining robot connectivity in realistic communication environments, while avoiding collision with both fixed and moving obstacles. We consider both packet-dropping and communication noise based receivers. We furthermore prove the convergence of the proposed framework under certain conditions. Finally, our simulation results show the performance of the proposed navigation framework.

关键词： Target tracking Navigation Convergence Mobile communication Robots Base stations Wireless communication Wireless sensor networks Motion control Communication system control

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A Novel Cloud Market Infrastructure for Trading Service

A Novel Cloud Market Infrastructure for Trading Service

引用

International Conference on Computational Science and its Applications (ICCSA)

作者： Biao Song Mohammad Mehedi Hassan Eui-Nam Huh Internet Computing and Network Security Laboratory Department of Computer Engineering Kyung Hee University South Korea

In this paper, we present a novel combinatorial auction (CA) based trading infrastructure to enable the supply and demand of Cloud services from different Cloud providers (CP). We propose a new auction policy that considers the relationship among CPs (mutual business relationship) in bidding mechanism. In our new auction-based market model, we allow the group of service providers to publish their bids collaboratively as a single bid to the auctioneer. It gives service providers a chance to autonomously find partners and make groups. Then they can use group strategy to increase their competitive power and compete for winning the bid (s). This will reduce conflicts, as well as collaboration cost and negotiation time, among participants as compare to existing CA-based market model. We implement our proposed market model of trading service in a simulated environment and study its economic efficiency with existing model.

关键词： Cloud computing Collaboration Resource management computer networks Power generation economics Power system modeling Environmental economics Supply and demand Costs Application software

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A Temporal Description Logic Based Access Control Model for Expressing History Constrained Policies in Semantic Web

A Temporal Description Logic Based Access Control Model for ...

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International Workshop on Policies for Distributed Systems and networks

作者： Fathieh Faghih Morteza Amini Rasool Jalili Sharif Network Security Center (NSC) Department of Computer Engineering Sharif University of Technology Tehran Iran

An access control model for semantic Web should be compatible with the corresponding semantic model. The access control procedure(s) should also take the semantic relationships between the entities (specified as ontologies) into account. Considering the benefits of logic-based models and the description logic foundation of semantic Web, in this paper, we propose an access control model based on a temporal variant of description logics (TL-ALCF). This logical schema enables us to express history constrained policies to enrich the policy-base with dynamic properties based on previous *** specification of each component of the model as well as the approach to define history constrained policies along with some clarifying examples are presented. The access control procedure of the model is proposed over the inference services of TL-ALCF.

关键词： Logic Access control History Semantic Web Ontologies computer security computer networks Distributed computing Electronic mail Authorization

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Characterization and modeling of wireless channels for networked robotic and control systems - a comprehensive overview

Characterization and modeling of wireless channels for netwo...

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2009 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Yasamin Mostofi Alejandro Gonzalez-Ruiz Alireza Gaffarkhah Ding Li Cooperative Network Lab Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA

The goal of this paper is to serve as a reference for researchers in robotics and control that are interested in realistic modeling, theoretical analysis and simulation of wireless links. To realize the full potentials of networked robotic systems, an integration of communication issues with motion planning/control is necessary. While considerable progress has been made in the area of networked robotic systems, communication channels are typically considered ideal or ideal within a certain radius of the transmitter, both considerable oversimplifications of wireless channels. It is the goal of this paper to provide a comprehensive overview of the key characteristics of wireless channels, as relevant to networked robotic operations. In particular, we provide a probabilistic framework for characterization of the underlying multi-scale dynamics of a wireless link: small-scale fading, large-scale fading and path loss. We furthermore confirm these mathematical models with channel measurements made in our building. We also discuss channel characterization based on the knowledge available on the geometry and dielectric properties of the environment.

关键词： Control system synthesis Robot control Communication system control Fading Analytical models Motion planning Motion control Control systems Communication channels Transmitters

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Profiling Node Conditions of Distributed System with Sequential Pattern Mining

Profiling Node Conditions of Distributed System with Sequent...

引用

Software Technologies for Future Dependable Distributed Systems

作者： Yu Hirate Hayato Yamana Media Network Center Waseda University Japan Department of Computer Science and Engineering Waseda University Japan

ISBN: (纸本)9781424435654

Recently, with wide-spread of distributed systems, distributed monitoring systems are needed to mange such systems. However, since monitoring architecture of distributed system faces a huge amount of log data which come from local computing nodes, information aggregation is fundamental scheme for monitoring distributed system. In this paper, we preset a novel approach for extracting computing node-condition profiles by using sequential pattern mining, which is one of data mining techniques. Extracted computing node condition profiles represent node condition patterns which are occurred in many computing nodes frequently. Thus, extracted profiles enable summarized distributed system conditions to be small sized and easy-understandable information.

关键词： Data mining Monitoring Probability density function Databases computer architecture computers Pediatrics

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Fusion and Diversity Trade-Offs in Cooperative Estimation over Fading Channels

Fusion and Diversity Trade-Offs in Cooperative Estimation ov...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Mehrzad Malmirchegini Yasamin Mostofi Cooperative Network Laboratory Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA

In this paper we consider a network of distributed sensors that are trying to measure a parameter of interest cooperatively, by exchanging their acquired information repeatedly over fading channels. We consider different ways of using the available bandwidth, in terms of what each node can send to its neighbors. More specifically, we characterize the impact of local fusion and show how it is a suitable policy when graph connectivity is low. When poor link qualities are the main bottleneck, on the other hand, we show how a diversity approach can be more beneficial. The proposed framework highlights the underlying tradeoffs between fusion and diversity approaches in cooperative networks. It furthermore explores the impact of multiple sensing on the overall performance.

关键词： Fading Sensor phenomena and characterization Uncertainty Parameter estimation Additive white noise Gaussian noise Sensor fusion Electric variables measurement Bandwidth Monitoring

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Issues of interoperability in e-governance system and its impact in the developing countries: A Nepalese case study

Issues of interoperability in e-governance system and its im...

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International Conference on Advanced Communication Technology (ICACT)

作者： Manish Pokharel Jong Sou Park Network and Embedded Security Laboratory Computer Engineering Department Korea AeroSpace University Goyang South Korea

Most of the e-government projects fail. The unreliability in e-government system is very high. There are many reasons for failure but among them lack of interoperability is one of them. The interoperability is one of the prime features of electronic government system. It helps one system to interact with another system. It integrates all the required entities in the common domain. Enterprise architecture is one approach of providing interoperability among the different systems. EA provides a unified standard at the different levels of a system. This paper discusses on use and challenges of EA in developing countries. It also provides the solution of the challenges and the approach of reducing the failure rate of e-government system. It has considered the case of Nepalese context which is applied in all developing countries, especially in South Asia.

关键词： Electronic government computer security computer networks Embedded computing Aerospace engineering Cities and towns Asia computer architecture Business process re-engineering Software systems

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Broadcast signal transmission employing low noise mutually injected Fabry-Pérot laser diodes

Broadcast signal transmission employing low noise mutually i...

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Frontiers in Optics, FiO 2009

作者： Mun, Sil-Gu Oh, Sang-Min Choi, Ki-Man Lee, Chang-Hee Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Youseong-gu Daejeon 305-701 Korea Republic of Next Generation Research Department Korea Telecom Network Technology Laboratory Daejeon Korea Republic of

We demonstrated a broadcast signal transmission using mutually injected Fabry-Pérot laser diodes. It can accommodate 125 channels of HDTV signals with 100 GHz channel spacing. © 2009 Optical Society of America.

ISBN: (纸本)9781557528780

关键词： Digital television

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