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A volcano monitoring system plays a key role for launching emergency early warning, and the use of alternative technologies have proven their effectiveness in this setting, which is the case of wireless sensor networks. For surveillance systems, the real-time requirement is mandatory due to the need for immediate access to the signals derived from a natural disaster where the goal is safeguarding...
Wireless sensor networks (WSNs), now-a-days, are deployed in environmental data collection as well as in critical event monitoring. Successful data collection requires reliability while reliable event detection necessitates timeliness. Simultaneous data gathering and event monitoring is not well studied in literature. In this paper, we propose a system model that works on homogeneous data gathering...
Wireless Body Area Networks (WBANs) offer tremendous benefits for remote health monitoring and real-time patient care. However, the success of such a system would primarily depend on the reliability of the data transmitted by the WBAN. Two aspects of data reliability need to be considered, namely, data accuracy and data freshness (or, recentness of data). Assuming that the sophistication of the sensors...
The K-coverage configuration in wireless sensor networks (WSNs) is widely exploited to guarantee the quality of detecting critical events, such as enemy targets, forest fires, or toxic gases. In such applications, many urgent messages should be propagated to the whole network with time constraints. Although many previous studies effectively diminish the well-known broadcast storm problem, which causes...
Wireless body sensors combined with ubiquitous Wireless Sensor Networks enable pervasive healthcare applications. This technology can significantly improve the quality of life of chronically ill and elderly. Remote medical monitoring applications consist of many features as continuous medical monitoring, emergency alerts, location tracking and home automation. These heterogeneous systems have to implement...
Most researchers encountered the following two problems when working with real Wireless Sensor Networks (WSNs): (1) Sensor nodes cannot satisfy application requirements even though the nominal sensing/transmission rates of these nodes are much higher than required. (2) In a WSN deployed in a large area, it is difficult or infeasible to get runtime performance evaluation of sensor nodes. We found out...
Constructing an effective Query Routing Tree is the premise for continuous queries in a Wireless Sensor Networks (WSN). The query routing tree structures can provide sensors with a path to the querying nodes. At present, the data acquisition systems for WSN construct the routing structures in an ad-hoc manner, therefore, there is no guarantee that a given query workload will be distributed equally...
Wireless Sensor Network(WSN) is widely used in Emergency Management System(EMS) to assure requirement of safety in current society. When emergency happens, timely transmitting emergency information in changing environment should be assured. But this requirement can not be satisfied by conventional approaches which are based on static situations and centralized management. In this paper, to assure...
Wireless sensor networks are now being considered for mission critical applications, which are often largely unattended and need to operate reliably for years. However, due to the real world communication, sensing and failure realities, clock drift, and node faults, the system performance may degrade significantly over time. It is highly desirable that these natural deteriorations can be monitored...
The advancement of electronic sensing devices, microcomputers and wireless communication devices has lead to creation of new smart sensors, which can monitor actuate, compute and communicate. Typically, these sensors are deployed in non-deterministic mode (randomly) when deployed in large numbers. These sensor devices have the capability to self-organize into the so-called Wireless Sensor Networks...
Autonomous mobile sensors are employed with ever-increasing frequency, in applications ranging from search and rescue, detection of forest fires, and battlefield surveillance. In this paper, we consider a representative surveillance problem wherein a sparse number of mobile sensors are expected to cover events of interest in a deployment field. Each event appears for a certain time and then disappears...
Wireless sensor and actor networks (WSANs) have attracted much attention in the recent years. In WSANs, sensor nodes are in charge of the sensing task, while the actor nodes take actions in response to the sensed phenomena or the detected event. In order to execute the correct operations, the applications typically have to process the data or messages from the different sensors in the same order....
In wireless sensor networks, energy consumption is generally associated with the amount of sent data once communication is the activity of the network that consumes more energy. This work proposes an algorithm based on ldquoprincipal component analysisrdquo to perform multivariate data reduction. It is considered air quality monitoring scenario as case study. The results show that, using the proposed...
Low power consumption and small footprint make 802.15.4/ZigBee based devices well suited for personal healthcare applications, representing a promising alternative to patient monitoring under important scenarios such as emergency, post-op, continuous care, and chronic diseases. However, their use in a healthcare facility to monitor several mobile patients poses several difficulties, mainly because...
This paper addresses the problem of providing congestion-management for a shared wireless sensor network- based target tracking system. In many large-scale wireless sensor network target tracking scenarios (e.g., a surveillance system for tracking vehicles in urban environments), multiple targets may converge within close proximity of each other. Such scenarios may cause network congestion as nearby...
In wireless sensor networks, mobile sensors are often employed for enhancing the sensing coverage and detection accuracy. Current approaches assume mobile sensors with the capability of arbitrary movement. The usage of such sensors with unlimited mobility, however, requires complicated sensor manufactures and high intelligence of movement which are practically unrealistic in many practical applications...
To satisfying expected coverage degree of application, we derived the smallest active node number K through node active-sleep theory. We also achieved intra-cluster active nodes scheduling algorithm. In data gathering protocol, this algorithm can make vast intra-member nodes obtain sleep, reduce data delay, lighten cluster head burden. The simulated experiment shows that the result of the algorithm...
There have been works done by utilizing mobile sensors as supplementary to assist the sensing coverage for the static sensor nodes in possible event happenings. Most of them assume that the mobile sensors are equipped with unlimited mobility and thus can move anywhere within the monitored field. However, the assumption of unlimited mobility has its own limitations and is unrealistic in many practical...
Environmental monitoring is an area of significant research in the field of wireless sensor networks. It has the potential to reveal fine-grained, dynamic changes in monitored variables of an outdoor landscape. A network of sensor nodes spread across a field has the capacity to provide temporal and spatial data regarding the properties of the environment. For example, sensor networks could provide...
The increasing ubiquity of mobile embedded systems has been matched by the evolution of a variety of wireless network standards and technologies. The major constraints of wireless embedded systems are limitations of communication bandwidth, processing capabilities, and battery power. Remote wireless embedded systems often act as sensors, which provide data to a certain community. The exchange of data...
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