The development of collaborative multimedia applications today follows a vertical development approach, which is a major inhibitor that drives up the cost of development and slows down the pace of innovation of new ge...
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The development of collaborative multimedia applications today follows a vertical development approach, which is a major inhibitor that drives up the cost of development and slows down the pace of innovation of new generations of collaborative applications. In this paper, we propose a network communication broker (NCB) that provides a unified higher-level abstraction that encapsulates the complexity of network-level communication control and media delivery for the class of multimedia collaborative applications. NCB expedites the development of next-generation applications with diverse communication logics. Furthermore, NCB-based applications can be easily ported to new network environments. In addition, the self-managing design of NCB supports dynamic adaptation in response to changes in network conditions and user requirements
As the dynamic voltage scaling (DVS) technique provides system engineers the flexibility to trade-off the performance and the energy consumption, DVS has been adopted in many computing systems. However, the longer a j...
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The following topics were dealt with: wireless communications; mobile computing; ad hoc networks; mobile IP; sensor networks; UWB; multimedia; data management; MIMO; OFDM; mesh networks; coding; detection; modulation;...
The following topics were dealt with: wireless communications; mobile computing; ad hoc networks; mobile IP; sensor networks; UWB; multimedia; data management; MIMO; OFDM; mesh networks; coding; detection; modulation; antennas; signal processing; channel models; network layer protocols; media access protocol; congestion control; network analysis; and security
The proceedings contain 27 papers. The topics discussed include: multi-channel support for dense wireless sensor networking;data aggregation for target tracking in wireless sensor networks;a simulation study of integr...
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ISBN:
(纸本)3540478426
The proceedings contain 27 papers. The topics discussed include: multi-channel support for dense wireless sensor networking;data aggregation for target tracking in wireless sensor networks;a simulation study of integrated service discovery;context dissemination and aggregation for ambient networks: Jini based prototype;discovery and composition of services for context-aware systems;infrastructural support for dynamic context bindings;toward wide area interaction with ubiquitous computing environments;maintaining a world model in a location-aware smart space;auditing and inference control for privacy preservation in uncertain environments;developing a context-aware system for providing intelligent robot services;WLAN location-aware application based on accumulated orientation strength algorithm;context delivery in ad hoc networks using gossiping algorithms;and a sensor platform for sentient transformation research.
AmbiTalk is a ubiquitous system based on the session initiation protocol (SIP) and Bluetooth that allows a mobile device to automatically adapt the behavior of its communication services as its user moves from one loc...
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AmbiTalk is a ubiquitous system based on the session initiation protocol (SIP) and Bluetooth that allows a mobile device to automatically adapt the behavior of its communication services as its user moves from one location to another. The adaptation is policy-based and occurs both pre-call and mid-call. We present the AmbiTalk architecture and discuss how it allows a device to automatically adapt its communication properties to its current environment and other devices. We demonstrate the viability of the AmbiTalk approach with the implementation of a prototype
MANETs are important and integral part of next generation wireless networking. Real time multimedia communication over MANETs is challenging due to reasons like network topology changes, limitations of wireless links ...
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MANETs are important and integral part of next generation wireless networking. Real time multimedia communication over MANETs is challenging due to reasons like network topology changes, limitations of wireless links and demanding requirements of multimedia. Channel adaptivity is adopting applications to the dynamic and unpredictable network conditions. QoS adaptivity is adopting lower layers to multimedia application requirements. The novel cross layer context exchange approach called ConEx, presented in this paper improves the efficiency of this two-way information exchange. This paper focuses on adaptive multimedia applications over mobile ad hoc networks, which addresses the challenges of multimedia applications. ConEx uses publish-subscribe event notification system for vertical context exchange across layers of the mobile host and horizontal context exchange across the MANET. ConEx architecture and implementation issues are discussed in this paper.
Location-aware services can benefit from accurate and reliable indoor location tracking. ne widespread adoption of 802.11x wireless LAN as the network infrastructure creates the opportunity to deploy WiFi-based locati...
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ISBN:
(纸本)3540338942
Location-aware services can benefit from accurate and reliable indoor location tracking. ne widespread adoption of 802.11x wireless LAN as the network infrastructure creates the opportunity to deploy WiFi-based location services with few additional hardware costs. While recent research has demonstrated adequate performance, localization error increases significantly in crowded and dynamic situations due to electromagnetic interferences. This paper proposes collaborative localization as an approach to enhance position estimation by leveraging more accurate location information from nearby neighbors within the same cluster. The current implementation utilizes ZigBee radio as the neighbor-detection sensor. This paper introduces the basic model and algorithm for collaborative localization. We also report experiments to evaluate its performance under a variety of clustering scenarios. Our results have shown 28.2-56% accuracy improvement over the baseline system Ekahau, a commercial WiFi localization system.
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