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As sensor nodes are powered by battery of limited lifespan, energy consumption has always been an important issue in sensor networks. New generation of sensor network technology bring about the possibility of constructing a spatial index over a sensor network such that sensor queries are forwarded only to the relevant nodes. Existing spatial indices share the common feature of using the same node...
We illustrate the effective use of ATIM (ad hoc traffic indication message) window in static sensors to obtain potential energy savings for sensors during data dissemination in wireless sensor networks. The network consists of resource-rich mobile sink node and resource-constrained sensor nodes forming a square grid. Sink may be multihop away from the sensor nodes and in order to collect the data,...
Opportunistic networks have complex construction and are multi-formed. In order to standardize the research on opportunistic networks, a formal taxonomy was proposed, which formally defined the geographical preferences, movement terminals and special transmit nodes of opportunistic networks. Then the opportunistic networks were classified according to the taxonomy. This taxonomy provided an open platform...
The proliferation of continuous boundary monitoring in large-scale wireless sensor networks in various applications such as fires and hazardous bio-chemical material diffusion, soil moisture draws tremendous significant attentions. In this paper, we propose an energy-efficient EUCOW algorithm that monitors both interior and exterior boundary of unsmoothed object by selecting only the nodes are within...
We propose an algorithm, the perimeter echo algorithm (PEA), to accurately determine the location of sensor nodes in a wireless network. The algorithm assumes a limited number of nodes (beacons) in the network are equipped with a location finding mechanism such as GPS. Nodes on the perimeter range of a beacon echo the beacons virtual ID to all nodes within range. This approach reduces the number of...
Hexagonal wireless sensor network refers to a network topology where a subset of nodes have six peer neighbors. These nodes form a backbone for multi-hop communications. In a previous work, we proposed the use of hexagonal topology in wireless sensor networks and discussed its properties in relation to real-time (bounded latency) multi-hop communications in large-scale deployments. In that work, we...
In this paper, we consider decentralized estimation of a noise-corrupted deterministic parameter in wireless sensor networks with the aid of relay. We propose a new relay-aided decentralized estimation scheme by which relay collects the overheard messages from sensors, computes a local message, and then sends it to a destination. Besides, we develop the sensor selection policies to select the most...
With the keep growing of the ratio of people over 65, the health care system for elder people is facing challenges. WBAN, being the newest technology, will play an important role in elder people health care system. In this paper, we discussed integrated application of WBAN and WSN in nursing home's health care system, proposed a gradient routing protocol for WSN to satisfy the needs of WBAN data transfer...
The most advanced logistics solutions that are currently adopted in ports and terminals use RFID- and GPS-based technologies to identify and localize shipping containers in the yard. Nevertheless, because of the limits of these techniques, the position of containers is still affected by some errors or it cannot be determined in real-time. We propose a non-conventional approach where the position of...
In this paper we study the problem of collaboration in RF-Sensor networks, comprised of a large number of very small and low cost nodes, capable of sensing, communicating and computing. The Multi-phases Collaboration of such nodes may lead to the accomplishment of large sensing tasks, having useful applications in practice. First, we research two collaboration methods, one is no collaboration and...
In order to solve the problem of short continuous driving mileage and long charging time of electric vehicle (EV), the method of auto and rapid exchange system of EV battery cases is proposed. The exchange system deals with corresponding control of multi-components which are relatively moving each other. Based on single chip wireless transceiver nRF905 and MC68HC908GZ16, the wireless communication...
With the advent of location aware sensor applications, precise location discovery has become an important technology in wireless sensor networks. Inter Peer communication in the sensor network has been modeled as the graph with constraints defined in terms of proximity. Recurrent grid based voting approach (RGBV) has been introduced to estimate the location of unknown nodes in the network. Voting...
Positioning requirements for mobile nodes in wireless (sensor) networks are largely increasing. However for indoors environments most of the existing solutions are expensive in terms of technology or infrastructure. We propose an indoors positioning scheme in which a static user collects self-estimated positions of collaborating peer nodes within radio range as well as the error ranges of these estimations...
This article presents wireless personal area networks with low transmission rate, utilized more and more often in industrial or alarm systems, as well as in sensor networks. The structure of these systems and available ways of transmission are defined by the IEEE 802.15.4 standard. The second part of the paper contains the description of simulation tests that have been realized. Their results make...
Recently, different types of sensors have been developed to detect environmental changes (e.g., instability of the earth's crust) and to reduce the associated damage. For an efficient usage of the sensor technology, several design factors (e.g., topology and sensing coverage) should be taken into account. In this paper, we focus on the underlying topology of sensor networks in two-dimensional environments...
Low latency data delivery is an important requirement for achieving effective monitoring through wireless sensor networks. When sensor nodes employ duty cycling, sending a message along the shortest path, however, does not necessarily result in minimum delay. In this paper we firstly study the lowest latency path problem, i.e., the characteristics of path with mini delay that connect a source node...
Wireless sensor networks have been widely used for ambient data collection in diverse environments. While in many such networks the sensor nodes are randomly deployed in massive quantity, there is a broad range of applications advocating manual deployment. A typical example is structure health monitoring, where the sensors have to be placed at critical locations to fulfill civil engineering requirements...
Combining cross-layering and autonomic paradigms is considered, until now, the best alternative for better Quality of Service (QoS) support in wireless networks. We adopt this combination in the design of a new architecture called Cross- Layer Engine (XLEngine) having the ability to make optimizations based on local and network wide knowledge. The unique mode to acquire this network knowledge is that...
To achieve better performance, we adopt a heterogeneous sensor network (HSN) model. In many applications, the locations of some sensor nodes are controllable. In this paper, first we propose a novel density-varying deployment scheme for high-end sensors (H-sensors) in an HSN. The scheme solves the bottleneck problem in typical many-to-one sensor networks. We then study the optimal placement of H-sensors...
In a wireless sensor network, an adversary equipped monitoring antenna can easily overhear packets, which may facilitate identifying the directions of packet flows and trace to the sink or source nodes. In order to defend the location privacy of the sink and source nodes, we propose a location privacy support scheme (LPSS). We prove that, with the increase in distance between sink and source node,...
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