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Due to the oceanic climate and frequent earthquakes in Japan, bridge health diagnosis is a problem of greater complexity. In bridge diagnosis system, we develop a wireless sensor network to sample and gather the vibration data of bridge. Time synchronization is a crucial component for the wireless sensor network (WSN), because large populations of sensor nodes will collaborate in order to complete...
For WSNs, many data dissemination protocols have been proposed for mobile sink groups, in which sinks are spatially apart each other in their close proximity and move together according to group mobility. Most previous works cannot be directly applied to mobile sink groups due to the control overhead caused by the individual mobility in the group. M-geocasting protocol considers both of data dissemination...
Beaconless position-based forwarding protocols have recently evolved as a promising solution for packet forwarding in wireless sensor networks. However, as the network density grows, the overhead incurred grows significantly. As such, end-to-end energy and delay performance is adversely impacted. Motivated by the need for a forwarding mechanism that is more tolerant to growth in node density, an alternative...
Due to the rapid improvements of wireless technologies and mobile devices'capabilities, we are witnessing an important growth in applications using thin mobile devices. Augmented reality took advantage of the enhancement of thin mobile devices, which led to the emergence of Mobile Augmented Reality (MAR). Given that thin mobile devices can not have the entire virtual environment (VE) stored locally,...
In sparse wireless sensor networks data collection is typically accomplished through specialized mobile nodes. One of the main challenges to be faced in this kind of networks is the energy-efficient and timely discovery of mobile nodes. In this paper we propose a simple yet effective discovery protocol based on two different Beacon messages emitted by the mobile node (i.e., Long-Range Beacons and...
In this paper, we consider the double-blindness problem in large-scale wireless sensor networks (WSNs) with mobile sinks, where the mobile sink(s) and data do not know the locations of each other a priori. We first propose a random line walk mechanism for message forwarding and based on this forwarding mechanism we further propose an efficient data discovery scheme called Double Cross to address the...
In this paper, we propose a new Compression Cluster-based scheme in a Spatial Correlated Region (CC SCR) for event-driven applications in wireless sensor networks. The main idea behind our proposal is to exploit the spatial correlation of such networks in order to reduce the size of the data packets that will be sent by means of data compression. The proposed clustering scheme is based on selecting...
In this paper we propose an analytical model to detect and remove malicious nodes while taking into account MAC IEEE 802.15.4 beacon-enabled technology. The proposed solution called muDog enables to monitor nodes activities with a minimal energy consumption in order to detect the suspicious behavior particularly the non-cooperative nodes in the routing process. Moreover, we analyze the cost of the...
Reliable, fast and energy-efficient data dissemination is one of the essential features for several applications in wireless sensor networks (WSNs). In the dawn of WSNs, data delivery techniques considered only static data sinks. However, static sink approaches place a considerable burden on sensor nodes surrounding the sinks in terms of traffic and energy consumption. Eventually, data dissemination...
Wireless sensor networks are composed of low cost and extremely power constrained sensor nodes which are scattered over a region forming multi-hop and self organized networks, making energy consumption a crucial design issue. These networks are used for various applications such as field monitoring, home automation, seismic and medical data collection or surveillance. Research has shown that clustering...
IEEE 802.11ad Task Group is currently defining a standard for multi-gigabits per second data rate WLAN connections in the 60 GHz band with a target completion date of 2012. The 802.11n, which operates in 2.4/5 GHz band, guarantees data rate of at least 108 Mbps and coverage of about 50 meters, with a maximum data rate of 600Mbps over relatively short distances. In comparison, 60 GHz band can support...
Given that transmission cost is significant in a Wireless Sensor Network (WSN), sending explicit keying control messages significantly increases the amount of energy consumed by each sensing device. Thus, in this paper, we address the issue of security for WSNs from a completely novel perspective. We present a technique to secure the network, without the transmission of explicit keying messages needed...
We present a novel topology control algorithm for very dense wireless sensor networks that is constrained by a small maximum nodal degree k. Particularly, we limit k = 4 which makes it challenging to formulate a connected network that possesses favorable properties such as a small diameter, short average path length and low energy consumption. Towards this goal, we introduce a graph theoretic approach...
Several application scenarios of wireless sensor networks require coverage of a given region of interest to be guaranteed. In order to establish a coverage preserving configuration, sensor nodes must coordinate and thus invest precious energy resources for both computation and communication. Reducing this overhead is particularly important in applications requiring frequent recomputations of the coverage...
Dynamic phenomena such as oil spills, mud flow, diffusion or leakage of gases in the environment are characterized by non-deterministic variations in shape, size and direction of motion. Due to the absence of any well defined model for tracking their dynamics, the detection and tracking of such phenomena through Wireless Sensor Networks (WSNs) is very challenging. Most of the existing works consider...
Duty cycling is often used to reduce the energy consumption caused by idle listening in Wireless Sensor Networks (WSNs). Most studies on WSN protocols define a common duty cycle value throughout the network to achieve synchronization among the nodes. On the other hand, a few studies propose adaptation of the duty cycle according to uniform traffic conditions, which is beneficial assuming one-to-one...
Energy efficiency is of great importance for the wireless sensor network (WSN). A popular way to save energy is to construct clusters for data aggregation and forwarding. This paper studies the distributed cluster algorithm to improve the energy consumption efficiency. We observe that the cluster head has to lie within the transmission range of the base station (sink node) and the distance between...
Several underwater network characteristics, including long propagation delays and a bandwidth dependent on distance, provide unique challenges to protocol designers. In this paper we present STUMP-WR, a distributed routing and channel scheduling protocol, designed for heavily loaded underwater networks. STUMP-WR selects and schedules links using a distributed algorithm to overlap communications by...
Network-wide broadcasting and multicasting are two important routing schemes used in group communications. In network-wide broadcasting, generated packets at the source node are distributed to all nodes in the network, while multicasting delivers the packets only to a subset of the nodes by creating and maintaining a data dissemination structure. Due to the overhead in multicasting, in certain situations,...
This paper proposes a new Random Channel Selection scheme with probabilistic backoff, called RCS, for a class of multi-channel MAC protocols in heavy loads WSNs to tackle the channel conflict problem. By adopting RCS, a node can reduce the probability of selecting a busy channel for data communication. Therefore, RCS can avoid data packet collision, and thus conserve more energy to extend the lifetime...
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