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Allocation of shared data based on mobile user movement 3

引用

3rd international conference on Mobile Data Management (MDM 2002)

作者： Peng, WC Chen, MS Natl Taiwan Univ Dept Elect Engn Taipei 10764 Taiwan

ISBN: (纸本)0769515002

In this paper, we devise data allocation algorithms that can utilize the knowledge of user moving patterns for proper allocation of shared data in a mobile computing system. By employing the data allocation algorithms devised, the occurrences of costly remote accesses can be minimized and the performance of a mobile computing system is thus improved. The data allocation algorithms for shared data, which are able to achieve local optimization and global optimization, are developed. Local optimization refers to the optimization that the likelihood of local data access by an individual mobile user is maximized whereas global optimization refers to the optimization that the likelihood of local data access by all mobile users is maximized. By exploring the corresponding features, we devise algorithm SD-local and algorithm SD-global to achieve local optimization and global optimization, respectively. The simulation results show that the knowledge obtained from the user moving patterns is very important in devising effective data allocation algorithms which can lead to prominent performance improvement in a mobile computing system.

关键词： Computational modeling Computer architecture Computer networks Costs distributed computing distributed databases File servers Mobile communication Mobile computing Portable computers

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A methodology for collection selection in heterogeneous contexts

A methodology for collection selection in heterogeneous cont...

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3rd international conference on Information Technology: Coding and computing (ITCC 2002)

作者： Abbaci, F Savoy, J Beigbeder, M Ecole Natl Super Mines F-42023 St Etienne Du Rouvray France

ISBN: (纸本)0769515061;076951507X

In this paper we demonstrate that in an ideal distributed Information Retrieval environment, taking the ability of each collection server to return relevant documents into account when selecting collections can be effective. Based on this assumption, we suggest a new approach to resolve the collection selection problem. In order to predict a collection's ability to return relevant documents, we inspect a limited number n of documents retrieved from each collection and analyze the proximity of search keywords within them. In our experiments, we vary the underlying parameter n of our suggested model to define the most appropriate number of top documents to be inspected. Moreover, we evaluate the retrieval effectiveness of our approach and compare it with both the centralized indexing and the CORI approaches [1], [16]. Preliminary results from these experiments, conducted on WT10g test collection, tend to demonstrate that our suggested method can achieve appreciable retrieval effectiveness.

关键词： information retrieval distributed information retrieval collection selection results merging strategy evaluation

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An architecture for a distributed 3G mobile terminal

An architecture for a distributed 3G mobile terminal

引用

3rd international conference on 3G Mobile Communication Technologies

作者： Constantinou, A Amery, P Reynolds, P Orange Personal Commun Serv Ltd Bristol Avon England

ISBN: (纸本)0852967497

The paper develops an abstract architectural view of a distributed mobile terminal for use in third generation mobile systems, including UMTS and the Mobile Internet. The actual physical form that a third generation terminal will take is still arguable, however, it is possible to be architecturally prescriptive as to the logical form such a terminal should take. The paper starts by reviewing the current status of mobile terminal development and an analysis of the perception of what comprises a third generation mobile terminal. From this analysis hints as to what elements that comprise the architecture are extrapolated. Building upon these findings, the paper presents, for discussion, a conceptual architecture for a 3G mobile terminal, which will impose no restrictions upon implementation. The general operation of the functions that comprise the architecture will be outlined.

关键词： Mobile telecommunication systems

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WONS 2006 - 3rd international conference on Wireless on Demand Network systems and Services

WONS 2006 - 3rd International Conference on Wireless on Dema...

引用

3rd international conference on Wireless on Demand Network systems and Services, WONS 2006

The proceedings contain 26 papers. The topics discussed include: towards end-to-end QoS in ad hoc networks;intelligent solution for congestion control in wireless ad hoc networks;real-time multiplayer game support using QoS mechanisms in mobile ad hoc networks;intensity-based event localization in wireless sensor networks;content-initiated organization of mobile image repositories;a gossip-based distributed news service for wireless mesh networks;message-on-demand service in a decentralized unified messaging system;a layer-2 architecture for interconnecting multi-hop hybrid ad hoc networks to the Internet;a cross-layering approach to optimized seamless handover;fair power and transmission rate control in wireless networks;a localized authentication, authorization, and accounting (AAA) protocol for mobile hotspots;and churn resistant de Bruijn networks for wireless on demand systems.

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An efficient algorithm for distributed power control in cellular radio systems

An efficient algorithm for distributed power control in cell...

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3rd international conference on 3G Mobile Communication Technologies

作者： Rabee, SA Sharif, BS Sali, S Univ Newcastle Upon Tyne Newcastle Upon Tyne NE1 7RU Tyne & Wear England

ISBN: (纸本)0852967497

In most modern cellular radio systems efficient interference management aims at acceptable Carrier-to-Interference (CIR) ratios in all active communication links in the system. Power control is an integral technique in the design and operation of such cellular radio systems. It can be used to reduce cochannel interference and hence the near- far effects. Two main approaches have been adopted for power control, which are known as centralized and distributed. Centralised power control requires knowledge of the information of all link gains between base stations and mobiles, which is very difficult to implement for large real-time systems. In this paper, we consider distributed power control algorithms, which are only based on local information at the base station. A new technique based on the method of Projection Onto Convex Sets (POCS) is developed and is used to obtain the minimum protection ratio. Simulation results show that the POCS method achieves much faster convergence and improved outage probability than other conventional methods.

关键词： Cellular radio systems

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MobileIQ: A framework for mobile information access 3

引用

3rd international conference on Mobile Data Management (MDM 2002)

作者： Chandrasekaran, P Joshi, A Univ Maryland Baltimore Cty Dept Comp Sci & Elect Engn Baltimore MD 21250 USA

ISBN: (纸本)0769515002

In this paper we address issues related to mobility, personalization and asynchronous operation to support efficient access to the World Wide Web across weakly connected or low bandwidth wireless links. WWW provides a large globally distributed computing and information access infrastructure. With the large amount of accessible information came the problem of information overload, making the process of finding content of interest a difficult issue. This is further exacerbated in mobile environments because of the well-known resource constraints. We have developed MobilelQ, a distributed system and service infrastructure that can offer personalized mobile information access in a wireless network environment. MobilelQ addresses challenges unique to a mobile environment such as mobility management and disconnection management, in addition to issues common to all environments: content personalization, bandwidth utilization, download latencies, and user privacy. We will also demonstrate how this architecture may be used to provide location-based services to users of the MobilelQ system.

关键词： Bandwidth Content management Delay distributed computing Environmental management Mobile radio mobility management Privacy Web sites Wireless networks World Wide Web

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Personalised multimedia services for real-time video over 3G mobile networks

Personalised multimedia services for real-time video over 3G...

引用

3rd international conference on 3G Mobile Communication Technologies

作者： Dogan, S Eminsoy, S Sadka, AH Kondoz, AM Univ Surrey CCSR Guildford GU2 5XH Surrey England

ISBN: (纸本)0852967497

Efficient distribution of rich multimedia content requires personalisation of media services to client device and bearer link properties. The customisation of multimedia data delivery is imposed by the vast amount of network heterogeneity and diverse user terminal capabilities. This paper discusses varied personalised communication strategies whilst introducing a proposed scheme. In this scenario, media delivery is provided through content adaptation via transcoding at a central media gateway. This is achieved by acquiring terminal capability and link characteristics data from several distributed client-side gateways. Computer simulation results prove the efficiency of the proposed method.

关键词： Multimedia systems

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UTML: Unified Transaction Modeling Language 3

UTML: Unified Transaction Modeling Language

引用

3rd international conference on Web Information systems Engineering, WISE 2002

作者： Nektarios, G. Christodoulakis, S. Laboratory of Distributed Information Systems and Applications Technical University of Crete Greece

ISBN: (纸本)0769517668

We propose UTML as a high level transaction modeling language to facilitate the complex Web transaction design process. Web transactions may be complex, composed of several sub-transactions and they may access resources with diverse behavior and interfaces like legacy systems and databases. They may also have complex semantics. Thus, transaction design methodologies and tools need to be very flexible, allowing for designing Web applications from scratch (top-down design), as well as using existing systems or services to compose new applications which offer added-value services (bottom-up design) to the user. UTML is based on a transaction meta-model which can describe, in a flexible and extensible manner, most of the known transaction models as well as new ones according to the application's requirements. It provides modeling for transactions that incorporate different behavioral patterns, and it is capable of describing activities with weaker transactional semantics that do not have all the ACID properties. Unlike other models, it can be used to synthesize new transactions from pre-existing transaction systems (like legacy systems), with diverse transactional semantics. UTML provides a rich notation to visualize the transaction design process. This notation has been built on top of UML using its extension mechanisms. © 2002 ieee.

关键词： Legacy systems

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3rd international Workshop on Grid computing, GRID 2002

3rd International Workshop on Grid Computing, GRID 2002

引用

3rd international Workshop on Grid computing, GRID 2002

ISBN: (纸本)3540001336

The proceedings contain 28 papers. The special focus in this conference is on Applications and Frameworks. The topics include: Framework for peer-to-peer distributed computing in a heterogeneous, decentralized environment;grid-based monte carlo application;a grid service-based active thermochemical table framework;enabling applications on the grid;simulation of dynamic grid replication strategies in optorsim;scheduling independent tasks with QoS requirements in grid computing with time-varying resource prices;a theoretical approach to load balancing of a target task in a temporally and spatially heterogeneous grid computing environment;source code transformations strategies to load-balance grid applications;a parallel CORBA component model for numerical code coupling;meaning and behaviour in grid oriented components;trustless grid computing in concert;a unified peer-to-peer database framework for scalable service and resource discovery;grid resource discovery based on a routing-transferring model;resource allocation for steerable parallel parameter searches;an authorization framework for a grid based component architecture;supporting secure ad-hoc user collaboration in grid environments;XML-based policy engine framework for usage policy management in grids;fine-grain authorization for resource management in the grid environment;enhanced algorithms for multi-site scheduling;experiments with scheduling using simulated annealing in a grid environment;a policy service for GRID computing;a resource monitoring architecture for the grid;a remote procedure call API for grid computing;distributed query processing on the grid;using disk throughput data in predictions of end-to-end grid data transfers and improving the throughput of remote storage access through pipelining.

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An energy-efficient diagonal-based directed diffusion for wireless sensor networks 9

An energy-efficient diagonal-based directed diffusion for wi...

引用

9th international conference on Parallel and distributed systems, ICPADS 2002

作者： Chen, Yuh-Shyan Nian, Yau-Wen Sheu, Jang-Ping Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan Department of Computer Science and Information Engineering National Central University Chung-Li Taiwan

ISBN: (纸本)0769517609

We present a new energy-efficient directed diffusion protocol by using the proposed diagonal-based hexagonal-mesh scheme for a wireless sensor network. The wireless sensor network is more reasonable to build a fixed-topological wireless network environment than the conventional MANET due to the low mobility. Therefore, all sensor nodes are arranged into a fixed-topological wireless network structure, namely the hexagonal-mesh, while the MAC protocol is adopted using the periodic active-and-sleep model. The wireless sensor networks use battery-operated computing and sensing devices. The directed diffusion is mainly operated on the diagonal-paths of the hexagonal-mesh under the energy-efficient consideration. To achieve the energy-efficient purpose, our diagonal-based directed diffusion scheme has the following main contributions: (1) a periodic active-and-sleep MAC protocol on TDMA channel model is designed;(2) a periodic backbone-path-exchange scheme is periodically performed on the diagonal-mesh to consider the per-node fairness problem;and (3) a directed diffusion communication application is developed based on the diagonal-based scheme. Finally, the performance analysis result is demonstrated to illustrate the energy-efficient achievement of our proposed scheme. © 2002 ieee.

关键词： Energy efficiency

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