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Trends in middleware abstarction for context dissemination in mobile Ad-Hoc netwok

Journal of Applied Sciences 2009年第1期9卷 1-14页

作者： Hakami, V. Dehghan, Mehdi Wireless Network Laboratory Department of IT and Computer Engineering Amirkabir University of Technology No. 424 Hafez Street Tehran Iran

Context dissemination completes the value chain of contextual information procurement and is identified as a precondition to actual context use by enlarging the visibility scope of context sources beyond the local acquisition or fusion entity and towards a network neighborhood. When leveraged for context-aware services in MANETs (Mobile Ad-hoc networks), an often-stated goal is to cater for personalized refinement and constant monitoring of a high volume of heterogeneous data with lower chance of longevity. Context-aware middleware abstractions pave the way by masking the physical distribution of data and by working out the appropriate logic for identifying the most relevant subset of context for use by an application component. This study compiles the state-of-the-art trends in programming abstractions built around the notion of context and present an exhaustives a detailed survey of their relevant middleware incarnations. Also, some key design considerations are identified for MANET-based context dissemination and the study investigates how these requirements have been approached from a variety of directions by the reviewed systems. © 2009 Asian network for Scientific Information.

关键词： Mobile ad hoc networks

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Call capacity improvement techniques for VoIP over Wireless Mesh networks

Call capacity improvement techniques for VoIP over Wireless ...

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International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Wason Liwlompaisan Anan Phonphoem Intelligent Wireless Network Group (IWING) Department of Computer Engineering Kasetsart University Bangkok Thailand

Due to the high overhead characteristics of wireless mesh network, the call capacity of VoIP is dramatically degraded. In the paper, the Aggregation Aware Routing with Path Separation (AAR-PS) protocol has been proposed. The protocol are designed by combining and engineering several techniques: packet aggregation, multi-path routing and event-triggered rerouting. The experiment results reveal that the protocol can accept more calls than existing protocols with acceptable packet delay according to the VoIP requirements.

关键词： Wireless mesh networks Routing protocols Bandwidth Costs Wireless LAN Wire IP networks Current measurement Delay effects Aggregates

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Handling Context in a Semantic-Based Access Control Framework

Handling Context in a Semantic-Based Access Control Framewor...

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International Conference on Advanced Information networking and Applications Workshops (AINAW)

作者： Moussa A. Ehsan Morteza Amini Rasool Jalili Sharif Network Security Center Department of Computer Engineering Sharif University of Technology Tehran Iran

As semantic Web grows, security concerns increase. One concern is controlling accesses to resources in this environment. In order to infer whether the access is allowed or not, different information of different entities including contextual information should be involved. From access control point of view, we divide the entities in semantic Web into three categories: resources (objects), requesters (subjects), and environment (infrastructure, time, and location). In this paper, we present a semantic-based context-aware access control framework to be applied in semantic Web, considered as a multi-domain environment. To handle context information in the framework, we propose a context ontology to represent contextual information and employ it in the inference engine. The proposed ontology classifies the context of a semantic Web environment and represents the elements of contextual information and their relationship in an abstract level. We illustrate how the access control framework handles the contextual information with the proposed context ontology.

关键词： Access control Semantic Web Ontologies Information security computer security Decision making Application software computer networks Engines Context modeling

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Credit-based network management

Credit-based network management

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1st International Conference on Communication Systems and networks and Workshops, COMSNETS 2009

作者： Jilong, Wang Chiu, Dah Ming Lui, John C.S. Tsinghua National Lab. for IS and Tech Network Research Center Tsinghua University China Information Engineering Department The Chinese University of Hong Kong Hong Kong Computer Science and Eng. Department The Chinese University of Hong Kong Hong Kong

ISBN: (纸本)9781424429127

Increasingly, a computer network administrator's job is pre-occupied with user behavioral problems rather than physical failures of network and system components. A small number of malicious users can cause problems that affect a large number of users;more often, by not following proper procedures a user may let his/her system be used by malicious users;and there are various other misuses that all leave the network in a state of the tragedy of the commons. In this paper, we introduce the concept of credit-based networking borrowing ideas from financial management and adapting them to network management. We first focus on a campus network by studying concrete scenarios of how credit-based network management can be applied. We then discuss how the concept is generally applicable to managing network behaviors as well by applying it to managing ISP peering relationships. We argue that the cascading effect of credit-based network management can enhance network management efficiency and improve the global network environment we all live in.

关键词： Behavioral research

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Optimal power allocation for minimizing visual distortion over MIMO communication systems

Optimal power allocation for minimizing visual distortion ov...

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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

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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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Profiling Node Conditions of Distributed System with Sequential Pattern Mining

Profiling Node Conditions of Distributed System with Sequent...

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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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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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