Barbara Hughes

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The increasing availability of wireless local area networking, particularly ad hoc networking, has lead to the evolution of new application domains, such as inter-vehicle communication and communication between autonomous mobile robots. Real-time communication is essential to allow applications in these domains to be realised. The characteristics of a(More)
Applications of inter-vehicle and vehicle-to-roadside communication that make use of vehicular ad hoc networks (VANETs) will often require reliable communication that provides guaranteed real-time message propagation. This paper describes an event-based middleware, called RT-STEAM. Unlike other event systems, RT-STEAM does not rely on a centralized event(More)
Applications of inter-vehicle and vehicle-to-roadside communication that make use of vehicular ad hoc networks (VANETs) will often require reliable communication that provides guaranteed real-time message propagation. This paper describes an event-based middleware, called RTSTEAM, designed to meet these requirements. Unlike other event systems, RTSTEAM does(More)
Despite the evidence from the literature of the benefits of collaboration, a collaborative practice model in the acute-care setting remains the exception rather than the dominant practice. The purpose of this study was to evaluate attitudes toward collaboration among nurses and physicians practicing in an acute care community hospital. The sample included(More)
Mobile applications, for example mobile robots, are playing an increasingly important role in our everyday lives. Since components of these applications share their environment with each other and with humans, they need to coordinate their behaviour to respect strong safety constraints. Unfortunately, they typically make use of wireless networks in which(More)
Air pollution, traffic congestion, stress and accidents are common features of today's road transportation experience. New approaches to improving the efficiency and safety of transportation systems are therefore required. Existing work on safe high-speed motorway driving, however, either assumes that vehicles are driverless and/or is limited to local(More)
Most previous work on real-time event-based communication has assumed infrastructure-based networks. The underlying assumption of this work is that application components are stationary and that a fixed network infrastructure exists to facilitate communication between them [1]. Ad hoc wireless networks comprise sets of mobile nodes connected by wireless(More)
Augmented reality and group communication in wireless ad-hoc networks form relatively new fields of research. When using group communication ordering and timeliness requirements are important. Moreover, when using wireless ad-hoc networks, the possibility of network partition is a serious consideration. In this paper we explore these three issues in the(More)
Achieving predictable communication latency in an ad hoc IEEE 802.11 wireless local area network necessitates an approach that overcomes the impact of the underlying non-deterministic contention-based medium access control (MAC) protocol. In this paper, we assess the feasibility of using a Time Division Multiple Access (TDMA) layer above the IEEE 802.11 MAC(More)