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A low-complexity algorithm is presented that clusters sensor nodes based on similarity in the sensed signals. This feature makes it an enabler for distributed detection of events that are impossible to identify using information available to a single node. The algorithm does not require system training prior to deployment nor does it assume statistical knowledge of the signal. Experimental results...
The fault rate of offshore wind turbines is so high that it is necessary to build a reliable condition monitoring system to improve the maintenance efficiency. To adapt to the harsh operating environment of offshore wind turbine, the condition monitoring system should have good self-healing ability. In this paper, the condition monitoring system of offshore wind turbine is built based on wireless...
Wireless sensor networks (WSNs) typically have a massive number of the sensor devices. The battery-powered (BP) sensor devices are the conventional type that has low transmission power due to the limited battery lifetime. The energy harvesting (EH) sensor devices can recharge their battery and therefore may transmit data with high transmission power. However, due to the low transmission power of the...
Wireless sensor networks (WSN) are specially distributed sensors deployed for the purpose of sensing and monitoring physical or environmental conditions. Sensor measurements in WSN usually suffer from both random errors (noise) and systematic errors (bias). This poses a major problem in the end application, as the data from the network become progressively uninformative.
A system providing accurate environmental data for campus stakeholders to formulate and evaluate policies of the sustainable campus development is needed. This paper presents the design of WSN infrastructure capable of providing accurate, real-time and reliable environment data, namely PM2.5, SO2, CO, O3, NO2, temperature, humidity, soil moisture and light intensity to be analyzed and presented by...
Data aggregation in WSN is usually done by simple methods such as averaging; these methods are vulnerable to certain attacks. To make trust of data and reputation of sensor nodes will be capable of performing more sophisticated data aggregation algorithm, thus making less vulnerable. Iterative filtering algorithm holds great promise for this purpose. To protect WSN from security issue, we introduce...
The consumption of energy in wireless sensor network is an important criterion. The sensor nodes play an important role in wireless sensor networks. The sensor nodes communicate with other nodes within the short distance via wireless medium. The sensor nodes are placed in the static places or Region of Interest (ROI). The sensor nodes are used to sense the desired physical parameters and they send...
Wireless Industrial Automation Networks may comprise large number of sensors and actuators which are densely deployed in various parts of an industry to monitor and control physical parameters like pressure, temperature, humidity, flow, level, density etc.by utilizing IEEE 802.15.4 standard. Typically, a sensor node consists of sensing subsystem for data acquisition, processing subsystem for data...
Indoor air quality is a rising issue these days. People are becoming are of the importance of indoor air quality. This paper further advances the technology for indoor air quality surveillance by adding an index feature to it. The index feature, accompanied with real-time monitoring system is very useful in giving the real-time alert to the users on the conditions of the current indoor air quality...
In the Internet of Things, smart things communicate with each other, and sensed data are aggregated and queried for satisfying certain requests of end-users. Wireless sensor networks (WSN) is a key enabling technique for achieving the vision of the Internet of Things. In real applications of WSN, such as environmental monitoring and vehicle tracking, they may require to launch spatial queries for...
In this paper, we consider the problem of covering vertices distributed over a two-dimensional plane with as small number of unit disks as possible. This restricted version of the set cover problem is motivated by the problem of reducing the network cost of Wireless Sensor Networks which have been widely used in recent years. The main contribution of the current paper is the proposal of an exact algorithm...
Lifetime extension is a critical issue for wireless body area network (WBAN) with limited battery energy. Unlike common wireless sensor network (WSN), sensor nodes' data rate requirements are heterogeneous in WBAN. Fairness assurance is also indispensable to avoid the consequence that a certain sensor node fails to be scheduled for a long time when the channel condition is persistently severe. With...
Wireless Sensor Networks (WSNs) are mostly deployed to detect events (i.e., objects or physical changes) at a high/low frequency sampling that is usually adapted by a central unit (or a sink), thus requiring additional resource usage in WSNs. However, the problem of autonomous adaptive sampling regarding the detection of events has not been studied before. In this paper, we propose a novel scheme,...
Health monitoring is an integral service for the long-term operation of wireless sensor networks. Instead of actively adding probe or status traffic, recently proposed passive health monitoring systems infer system health solely from existing application traffic. Our results from extensive testbed experiments prove that the detection rate of an exemplary monitoring application is significantly improved,...
Security in wireless sensor networks (WSNs) is very important. Traditional security schemes abandon compromised nodes and add a lot of redundancies to make the network resilient. These methods are not applicable to resource-limited WSNs. This paper proposes an adaptive and active defense mechanism with low power consumption. In our scheme, some nodes are configured as monitoring nodes to identify...
In the domain of Wireless Sensor Networks, Smart Home applications are becoming the newest trend. Such deployments face challenges of underlying complexity in programming of traditional wireless sensor networks as well as lack of collaboration within hardware components. To address these issues, a platform that considers sensors and actuators in a wireless sensor network as a database framework is...
Given the high uncertainty in the dynamics of Wireless Sensor Networks (WSN), it is essential to monitor the Quality-of-Service metrics in order to find the links with poor characteristics. This would allow to implement fault-tolerant protocols to reroute the control packets and avoid zones with untrusted links. However, network monitoring is not used as a permanent analysis tool. This is due both...
The feasibility of efficient wireless power transfer through Strongly Coupled Magnetic Resonance (SCMR) in non-homogenous interface such as air-concrete is studied here. Specifically, the efficiency of wireless power transmission from a source in air to a sensor embedded in concrete via strongly coupled magnetic resonance is analyzed. The concrete material is modeled for various humidity levels using...
The next generation of Wireless Sensor Networks (WSNs) will need to be sustainable in the field. Sustainability presents a number of management difficulties. Among these challenges is field programmability. Future WSNs will consist of nodes with different architectures, capabilities, and operating systems. Current solutions for reprogramming WSNs either require homogenous networks or substantial overhead...
Currently, the wireless sensor networks QoS is confronted with many challenges. Wireless sensor networks has many characteristics, such as basing on the data, and facing application and dynamic characteristics. This paper emphatically analyzes the description of wireless sensor networks QoS and its QoS evaluation method. Then quantize the QoS index and Computes QoS indexes weights. Finally, based...
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