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To solve the problem of high-energy-consumption of Wireless Sensor Network (WSN) nodes and short WSN lifetime, considering the practical underground environment of coal mine, this paper proposes a novel event-driven WSN in the coal mine system. The paper also discusses different working patterns of the proposed event-driven WSN, and switching methods between them. According to the safety regulation...
In addition to blog and schedule sharing, sharing physical data, such as noise or temperature values, and event data, such as information recorded when purchasing at a shop, with other nodes located in a distributed manner enables new applications using geographic distribution. Geographic distribution of physical data of noise allows a user to see geographic trends, such as the location of quiet areas,...
The boundary node chain of a wireless network with arbitrary deployment, recognized through method based on local generalized convex hull (Igch) or local convex view (lcv), often has gaps, especially where notches or holes exist. The existence of these gaps may cause serious unexpected problems in some wireless network applications. When using Igch to recognize the boundary of a network, a smaller...
Sensor nodes located on the boundary of the covered area often cause difficulties in maintaining a wireless sensor network's lifespan. This study proposes a simple method to approximate boundaries in wireless sensor networks. The approach uses only connectivity information of a network while not requiring nodes localize themselves. The proposed method divides a network into clusters and forms partial...
An important practical application of secure sensor networks is to monitor an area that may be divided into a square grid, where the sensor devices may be placed at the points of intersection with reasonable precision. In this paper, a simulation method to analyze and design such a network is discussed. The use of simulation technique is essential to determine the robustness (in terms of connectivity...
Sensor localization is a necessary and key functionality for the deployment of wireless sensor network (WSN) applications. This paper investigates on the range-free localization approaches for low hardware requirement. A modified DV-Hop localization algorithm is designed to reduce the localization error. The modified DV-Hop uses a novel average hop size estimate scheme, in which the local property...
Localization is an important research issue in Wireless Sensor Networks (WSNs). Recently, hop-count-based localization has been proposed as a cost-effective alternative to range-based localization algorithms. Traditionally, hop-counts between any pair of nodes can only take on integer values regardless of relative positions of nodes in the hop. We show that by partitioning a node's one-hop neighbor...
In this paper, we propose a method to save energy consumption for the rejoin procedure of ZigBee networks. By skipping the active scan process, a rejoining node and its neighbors are able to save a large amount of energy. In addition, the rejoining node chooses the suitable potential parent by reserving and utilizing original neighbor table. This method is capable of reducing the number of rejoin...
At present, many algorithms are presented, and APIT algorithm (Approximate Point-in-triangulation Test) is a kind of range-free localization, which has a relatively high precision and stable performance. However, the coverage rate of APIT algorithm is somewhat poor. With regards to this, this paper proposes an improved method which can convert those unknown nodes that can be located firstly to new...
In the context of sensor and ad hoc networks, wireless networking systems with mobile sensors have been studied enthusiastically for the applications to habitat and environment monitoring, and information communications between vehicles and portable devices. Since mobile objects move randomly and communicate each other wirelessly only on close ranges, it is possible to happen frequent disconnection...
The coverage control technology is the one of the basic technologies of wireless sensor network, and is mainly concerned about how to prolong the network lifetime on the basis of meeting user sense demands and network connection. Among this technology, localized area coverage algorithm in the study of area coverage technology is gradually attracting wide attention, for its less traffic and lower single-node...
TinyOS is an open source operating system for wireless sensor networks developed by the University of California at Berkeley, aimed at the character of sensor network. In TinyOS environment, the system not only provides a powerful simulation tool to ensure the accuracy of the system, the system also provides a series of tools to simplify the development of the system, using these tools can greatly...
One of the exigent problems in wireless sensor networks is the recognition of network boundary and the detection of holes within the network. In this paper, we propose an algorithm in which every node in the network self-detects whether it is a boundary node or an inner node by utilizing the available connectivity information and making no assumptions about the location awareness. The algorithm is...
In this paper, we study the selection of active sensors in wireless sensor networks (WSN) subject to a limited energy consumption and a given estimation error. A cost function based on spatial correlation is derived for active sensor selection. Accordingly, a new adaptive algorithm is proposed in which the number of active sensors is adaptively determined and the best topology of active set is selected...
Location awareness is important in most of the wireless sensor networks. Many localization schemes have been proposed for both static and mobile wireless sensor networks. However, most of them aim at localizing the sensor nodes with global coordinate by using additional ranging hardware or anchors knowing its global position. These schemes may suffer from the problem of no reference coordinate system...
Sensing coverage is defined as the ratio of the sensible area to the entire desired area. It is one of the critical measures of performance or service quality offered by a sensor network. In previous studies, the sensing range of a node is generally assumed to be a deterministic value in all directions. In realistic environments, the sensing range of a node is not a constant because of shadowing effects...
In wireless sensor networks, two types of emerging range-free and high-accuracy localization approaches including the approximate-point-in-triangulation test (APIT) and the sequence based localization (SBL) greatly depend on density of anchor nodes and connectivity of network. In this paper, we present a novel localization approach that combines APIT with SBL, called SB-APIT. First, we use APIT approaches...
IEEE 802.15.4 was developed to meet the needs for simple, low-power and low-cost wireless communication. In the past couple of years it has become a popular technology for wireless sensor network. But in practical projects, we find that a long association delay is a critical problem in some real-time applications. This paper proposes a new association scheme named fast association mechanism (FAM)...
The localization technology is very important in wireless sensor network. Many localization algorithms have been proposed in recent year, in which DV-Hop is the prevail localization algorithm. But the DV-Hop algorithm is not very accurate. In this paper, we propose an algorithm to improve the positioning accuracy. The proposed algorithm mainly bases on the radio range of anchor nodes to determine...
In this paper, we evaluate the features and limitations of Tiny OS mote simulator (TOSSIM), the sensor network simulator in TinyOS systems. The focus is on the applicability of TOSSIM for intelligent home research. As a part of the research work, we designed and implemented a simple sensor network that can be used in a virtual intelligent home. Our conclusions are based on the tests performed with...
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