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In this paper, we propose a Hierarchical Role-based Data Dissemination approach, named HRDD, for large-scale wireless sensor networks with multiple mobile sinks. In HRDD, we use a hierarchical cluster-based structure to discover and maintain the routing paths for distributing data to the mobile sink. We assign two roles, named Indexing Agent and Gateway Agent, to some sensor nodes in the wireless...
In the emerging ??Web of Things??, digitally augmented everyday objects are seamlessly integrated to the Web by reusing Web patterns such as REST. This results in an ecosystem of real-world devices that can be reused and recombined to create new ad-hoc applications. This, however, implies that devices are available to the world. In this paper, we propose a platform that enables people to share their...
The Sensor Web Enablement (SWE) initiative of the Open Geospatial Consortium (OGC) defines standards for Web Service interfaces and data encodings usable as building blocks to implement a Sensor Web for geospatial applications. These standards encapsulate heterogeneous sensors installed in existing sensor networks for web-based discovery, scheduling and access. SWE has been applied in a multitude...
In this paper, we explore how to effectively create and use ??instant mesh networks??, i.e., wireless mesh networks that are dynamically deployed in temporary circumstances (e.g., emergency responses) - in addition to enabling coverage for internal on-site communications, such a network will support information flow into and out of the deployment site through its gateway (i.e., the mesh router that...
Ubiquitous communication depends on distributed machine intelligence that relates the needs of the tasks to be performed to the available system services and resources. A critical part of this process is the understanding of contextually-sensitive data that can influence the offering and delivery of these resources and services. This paper describes a new extension of the FOCALE autonomic architecture...
This demonstration presents the ongoing development of a framework for a global wireless sensor / actuator network (GWSAN). This GWSAN is formed through the interconnection of about 10 WSAN testbeds currently mainly located in Asia and Europe. GWSANs are one of the enabler for the Internet of Things and thus the Web of Things. Similar to the beginning of the Internet in the late 70s this GWSAN is...
Since GPS receivers have become a commodity anyone could access and use location information simply and freely. Such an easy access to ones' location is instrumental to development of location-aware applications. However, existing applications are static in that they do not model relations between places and mobile things. Moreover, these applications do not allow to easily map the physical location...
In this paper we propose a distributed congestion control algorithm for tree based communications in wireless sensor networks, that seeks to adaptively assign a fair and efficient transmission rate to each node. In our algorithm, each node monitors its aggregate output and input traffic rates. Based on the difference of the two, a node then decides either to increase or decrease the bandwidth allocable...
In this paper we investigate how ambient displays can be used to share context information. Currently, many personal devices provide context information, such as location or activity, and at the same time the number of ambient displays is increasing. We developed two prototypes for visualizing contextual information and initially explored the suitability of these in an online study. Additionally,...
In this paper, we investigate how packet delays and losses affect the quality of target tracking. Specifically, we use Bayesian information of the posterior distribution of target locations to quantify the quality of target tracking and investigate how network quality and measurement quality affect the value of Bayesian information. We show that improving measurement quality provides diminishing gain...
This paper has evaluated the system performance for the voice over Internet protocol (VoIP) services supported by the IEEE 802.16 systems in terms of the packet loss and delay, and it has also calculated the mean opinion score (MOS) in order to estimate the user's satisfaction for the VoIP services. By the simulation results, the MOS of the VoIP service supported by the unsolicited grant service (UGS)...
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