The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wireless technology and devices are becoming ever more pervasive and embedded in our lives. In particular, wireless access to the internet is defining the way that we learn, work and socialize. The primary motivation for undertaking this investigation was the author’s involvement in a community broadband project. The contributions of the paper have real impacts for industry and the results of this...
Live migration, the process of moving a virtual machine (VM) interruption-free between physical hosts is a core concept in modern data centers. Power management strategies use live migration to consolidate services in a cluster environment and to switch off underutilized machines to save power. However, most migration models do not consider the energy cost of migration. This paper experimentally investigates...
In this paper, we experimentally investigate the scope and usefulness of Dynamic Voltage and Frequency Scaling (DVFS) in multimedia servers. For our experiment, we considered four scaling policies, two heterogeneous servers, and two different application scenarios. In the first scenario, we used an IO-Intensive multimedia downloading application while in the second scenario we used a predominately...
In wireless sensor networks, energy is a scarce resource. Collision, as one of the major sources of the energy waste for medium access control (MAC) protocols, has been extensively investigated. However, it is mostly analyzed under the “saturated situation” in which the sampling rate is assumed to be equal to or larger than the transmission rate, which does not reflect the reality in many applications...
This paper introduces a light-weight mobility-aware medium access control protocol for wireless sensor networks (MA-MAC). In many respects, the protocol is similar to preamble based, low power listening MAC protocols. It defines a duty-cycle to let nodes sleep when they have no packets to transmit. During active communication, the protocol estimates mobility by evaluating the received signal strength...
The growing demand for a wireless link is taking the deployment of wireless local area networks away from the notion of carefully planned and carefully managed setting, into a randomly deployed and independently managed (if at all) network setting. This results in highly contentious networks. In fact research shows that in most metropolitan cities, the size of contentious access points that are closely...
This paper addresses the signal processing aspect of wireless sensor networks. It analyzes several time and frequency domain features of measurements that are taken from 3D accelerometer sensors. The measurements represent various types of movements related to humans and cars. The aim is to obtain quantitative as well as qualitative comparisons concerning the expression power of these features in...
Topology control in a wireless sensor network is useful for ensuring that the network remains connected in the presence of nodes that exhaust their energy or become altogether dysfunctional (for whatever reasons). It also ensures that all the link that can be established are energy-efficient links and the nodes utilize their energy fairly. In this paper, we propose a fair and energy efficient topology...
Several applications have been proposed for wireless sensor networks. These include habitat monitoring, structural health monitoring, pipeline (gas, water, and oil) monitoring, precision agriculture, active volcano monitoring, and many more. To demonstrate the feasibility of the proposals, researchers have developed prototypes and deployed them into real-world environments. Even though each prototype...
A significant amount of research effort is being carried out by the research community to increase the scope and usefulness of wireless sensor networks; to optimise life time by developing energy efficient power management, self-organising, medium access and routing protocols; and to reduce the cost of sensing nodes so that dense and robust deployment is possible. Though much has already been achieved,...
This paper presents a distributed architecture for reasoning about a higher-level context as an abstraction of a dynamic real-world situation. Reasoning about a higher-level context entails dealing with data acquired from sensors, which can be inexact, incomplete, and/or uncertain. Inexact sensing arises mostly due to the inherent limitation of sensors to precisely capture a real world phenomenon...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.