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This paper proposes an algorithm that uses predefined weights to create broadcast routes for a WirelessHART network. The network topology is represented by a graph, and the algorithm uses information of the devices present in the network to build the broadcast graph. At each iteration of the algorithm, a device is selected and then added to the broadcast solution graph. A cost function determines...
The existence of non-line-of-sight (NLOS) errors will considerably degrade the localization accuracy. Therefore, the NLOS node localization is investigated. In this article, we propose a NLOS node localization algorithm that utilizes the firefly algorithm. The objective function is established by the probability of propagation of NLOS and LOS according to the approximate maximum likelihood method...
With the increased complexity of low-end devices in the Internet of Things (IoT), mainly due to the connectivity and interoperability requirements, the development and configuration of embedded operating systems (OSes) for such devices is not straight forward. The complexity of the communication requirements is usually mitigated by the OS, e.g., the Contiki-OS, as it already incorporates an IoT-compliant...
The paper presents the Wireless Sensor Network (WSN) Simulator and its usage for designing the forest fire early detection system. The WSN Simulator is developed based on proposed Sensor model and WSN model. The WSN Simulator address important design issues as: coverage of the area under surveillance in relation to initial sensor deployment, number of sensors needed for targeted deployment, and coverage...
Industrial applications demand for ease of deployment, reliability and low-power in wireless networks, leading to standards like IEEE802.15.4, which include time synchronized channel hopping mechanisms. Yet, scheduling of transmissions on timeslots and channels falls outside the scope of current standards. Given the application requirements above, distributed (rather than centralized) scheduling has...
This article describes the methods and tools to verify the location of nodes in wireless sensor networks. Software product that allows to analyze the positioning based on the distance with different algorithms is proposed. As a result of simulation the next statistical output variables are defined: percentage of nodes, which have position determined; minimum, maximum and average error in assessing...
Digital Business or D-Business is an environment where nearly all physical and virtual assets in the value chain are digital. Intelligent objects, are a part of end-to-end processes. Business is conducted by intelligent agents making decisions based on context provided by the IoT — Internet of Things. In order to improve productivity in the value chain, a Steel Mill decided to automate one of its...
In the article the questions of application of the so-called technology of “Internet of things”. Analysis of the content and prospects of the development. Systematized and generalized information security of this technology, feasible solutions to existing problems. Detailed considered the triad of information security — confidentiality, integrity, availability.
The technical development towards the full vision of the Internet of Things (IoT) will affect the area of Electromagnetic Compatibility (EMC) in a number of ways. IoT may even be the most challenging issue for the EMC area since it was born about 100 years ago. In this paper, some of these new challenges are highlighted and discussed. The methodology in achieving EMC has to be further developed in...
This paper investigates the use of ultra-wideband (UWB) radio for communication in industrial wireless sensor networks (WSNs). OpenWSN is an open-source IPv6 mesh network protocol stack based on IEEE 802.15.4 time slotted channel hopping (TSCH). We adapted OpenWSN to operate an UWB physical layer based on the DecaWave DW1000 UWB transceiver. Experiments were conducted in an industrial steam heating...
In recent wireless networks, end-nodes are capable of detecting the existence of multiple wireless standards. In this context, it becomes very interesting to design an on-line reconfigurable communication system controlled by a Vertical Handover Algorithm (VHA) that allows selecting the best available wireless standard. In this demo, we propose implementing the Partial Reconfiguration (PR) technique...
This work is focused on a technique providing the integration of the method of clustered voltage scaling (CVS) in the digital design flow. The efficiency of this technique in the case of a hashing unit IP-block is considered. In order to reduce the power consumption special hash algorithms (NH, PH) in combination with the CVS approach were proposed. For the implementation of the CVS technique a number...
This paper considers indoor localization based on multilateration and averaged received signal strength indicator (RSSI). We propose two approaches called three minimum distances method (TDM) and weight values adjustment method (WAM) to deal with the poor accuracy of distances deduced from RSSI. Using a practical localization system, an experimental channel model is deduced in order to assess the...
Wireless sensor networks (WSNs) have found many applications in building environment monitoring and energy management applications. However, WSN data is not completely reliable and hence its use in energy management has to be carefully considered. Experiments conducted on a WSN test bed monitoring a campus classroom highlight how sensor data is prone to errors, underlining the need to detect faulty...
A disaster is a serious disruption of the functioning of a community or a society involving widespread human, material, economic or environmental loss and impacts, which exceeds the ability of the affected community or society to cope using its own resources. Researchers have been studying disasters for more than a century, and for more than forty years disaster research. When discussing disaster...
A wide range of mobile devices, e.g., wireless sensor nodes, RFID tags and smartphones, gradually coalesces into the Internet of Things (IoT). Debugging and optimizing such systems is challenging and necessary to realize the foreseen vision. In this paper, we describe our endeavor to build and adapt a testbed enabling the analysis of different scenarios involving mobile elements. Instead of creating...
In this work, indoor sensor localization is investigated based on the received-signal-strength-indicator (RSSI) using the compressive sensing (CS) framework. The fingerprints of several ZigBee base-stations are used to construct the dictionary matrix. We propose a weighted-coefficient-approach (WCA) to determine the sensor position based on the solution of the CS problem. Numerical simulations and...
Ultra-wide band (UWB) communication is a viable solution for Wireless Sensor Network (WSN) and Internet of Things (IoT) due to low cost and low power requirement. However, UWB transceiver design is more complex due to large bandwidth and precise synchronization requirement. In this paper, we propose a simple peak detection based non-coherent UWB receiver, suitable for low data rate WSN and IoT based...
The Routing Protocol for Low power and Lossy Networks (RPL) is a wide-spread, flexible routing protocol specifically designed for energy-constrained networks such as Wireless Sensor Networks (WSNs). The resilience of RPL has been verified in several existing evaluations, but how a simple node reset can impact the energy efficiency has not been investigated so far. Thus, in this paper we examine the...
Here, we would like to study the efficiency and utilization of radio frequency (RF) transmission in wireless sensor networks. A new dual source queueing model (with finite and infinite numbers of sensors) is introduced in order to obtain the most frequently studied system performance characteristics (e.g. mean response time, average number of jobs waiting for transmission, and the utilization of the...
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