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Recent advances in ambient energy-harvesting technologies have made it possible to power wireless sensor networks (WSNs) from the environment for long durations. However, the energy availability in an energy-harvesting WSN varies with time and thus may cause the network topology to evolve over time. In this paper, we study the topology design problem in a time-evolving and energy-harvesting WSN where...
A wireless sensor network refers to a spatially distributed autonomous sensor system to monitor physical or environmental conditions and to cooperatively pass their data through the network to a main location. With many industrial and consumer applications, the study of of wireless sensor network has attracted much research attention recently. In this paper, we study the sensor network cluster location...
With the miniaturization of electronic devices, small size but high capacity power supply system appears to be more and more important. A hybrid power source, which consists of a fuel cell (FC) and a rechargeable battery, has the advantages of long lifetime and good load following capabilities. In this paper, we propose the schematic of a hybrid power supply system, that can be integrated on a chip...
In cognitive radio networks, in order to avoid collision to primary user (PU), cognitive radio (CR) user ought to sense the spectrum periodically to certify that PU is absent. However, the collision to PU also occurs due to imperfect sensing or PU's returning when CR user is transmitting. In this paper, we study a transmitting-collision tradeoff problem in cognitive radio networks. In particular,...
The paper employed some independently developed sensors based on the Octopus X platform to build a Zigbee-based Sensor Networks. Also, we implemented a Location-aware living environment by deploying the developed Zigee-based sensor. Besides, through the created window console interface, the sensed data can be transmitted and transformed to the database for further utilized. Moreover, by the devised...
Object tracking is an important application in wireless sensor networks. To get the accurate location of a given object timely, designing an efficient routing protocol and incorporating it with the location response is the key. While limits of wireless sensor networks propose challenge for the routing of object tracking. This paper constructs a cluster-based routing tree, which makes balance between...
Localization is a fundamental problem in wireless sensor networks. Current localization algorithms mainly focus on checking the localizability of a network and/or how to localize as many nodes as possible given a static set of anchor nodes and distance measurements. In this paper, we study a new optimization problem, minimum cost localization problem, which aims to localize all sensors in a network...
The mobile sensor networks (MSNs) have been widely deployed to provide an ubiquitous solution for time-sensitive applications in a specific area with low deployment cost. The monitoring area of an MSN can be divided into several sensing regions (SRs). In an SR, the mobile sensor (MS) is responsible for reporting the sensed data to the sink node. For the time-sensitive applications on MSN, the time...
How to efficiently collect sensing data from all sensor nodes is critical to the performance of wireless sensor networks. In this paper, we aim to understand the theoretical limitations of data collection in terms of possible and achievable maximum capacity. Previously, the study of data collection capacity has only concentrated on large-scale random networks. However, in most of practical sensor...
Data collection is one of the most important functions provided by wireless sensor networks. In this paper, we study the theoretical limitations of data collection and data aggregation in terms of delay and capacity for a wireless sensor network where n sensors are randomly deployed. We consider two different communication scenarios (with or without aggregation) under physical interference model....
Node localization which is determining where a given node is physically or relatively located is extremely crucial for most of the applications in wireless sensor network. In this article, we review and describe the taxonomy and fundamental localization methods. The current research in WSN localization algorithms are introduced, analyzed and concluded. The point is that no single algorithm performs...
Data collection is one of the most important functions provided by wireless sensor networks. In this paper, we study theoretical limitations of data collection and data aggregation in terms of delay and capacity for a wireless sensor network where n sensors are randomly deployed. We consider different communication scenarios (single sink or multiple sinks, regularly-deployed or randomly-deployed sinks,...
The delay/fault-tolerant mobile sensor network (DFTMSN) has been proposed recently for pervasive information gathering. A DFT-MSN consists of a number of wearable sensor nodes and high-end sink nodes, forming a loosely connected mobile sensor network. In this paper we introduce a generic queuing analytic model for DFT-MSN, where the inputs are the data delivery scheme employed and the nodal mobility...
Wireless sensor networks (WSNs) have attracted a lot of research attention. WSNs contain a large number of nodes that are capable of sensing, processing and transmitting environmental information. In this paper, object detection has been studied. For WSNs are composed of power-restrained nodes, so energy-efficiency is a key concern in WSNs. Balancing object detection performance and network lifetime...
The life time of RF front end in wireless sensor networks (WSN) is so important that it decides whether the whole system can work normally for a long time. Under CMOS technology, negative bias temperature instability (NBTI) is one of the most important factors that decide chips' life time. Especially with the feature size declining, NBTI effect is becoming more and more serious. Previous works mainly...
In this paper, a two-phase geographic greedy forwarding (TPGF) routing algorithm is proposed in wireless multimedia sensor networks (WMSNs). TPGF is a pure geographic greedy forwarding routing algorithm, which does not include the face routing and does not use planarization algorithms. Simulation comparison in this paper indicates that TPGF is highly suitable for multimedia transmission in WMSNs.
Wireless sensor networks (WSNs) have attracted a lot of research attention which consist of a large number of sensors. Sensors are capable of sensing, processing and transmitting environmental information. Data collection and object detection are two main applications in WSNs. In this paper, object detection has been studied. By detecting persistent object and ephemeral object, we investigate in detail...
To preserve network connectivity is an important issue especially in wireless sensor network, where wireless links are easy to be disturbed and tiny sensors are even easy to fail accidently. Therefore, it is necessary to design a fault-tolerant network. A feasible method is to construct a k-vertex connected topology. In this paper, we consider k-connectivity of wireless network and propose a simple...
The localization algorithm in wireless sensor network is always a hot spot. Information collected by the sensors is meaningless without the position of the sensors. Now, paying little attention to 3-D space, most of the algorithms are for 2-D space. In this paper we introduce a novel algorithm for 3-D space called OBS (Optimal Beacon Selection) algorithm. In this algorithm we launched the concept...
Routing in wireless networks has been heavily studied in the last decade and numerous routing protocols were proposed in literature. The packets usually follow the shortest paths between sources and destinations in routing protocols to achieve smallest traveled distance. However, this leads to the uneven distribution of traffic load in a network. For example, wireless nodes in the center of the network...
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