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The wireless sensors deployed at the highway can ensure the safety of the traveling vehicles. However, the ribbon deployed wireless sensor network in the roadside infrastructure can easily to generate energy hole. Cooperative communication between sensors and vehicles is an effective way to improve this situation and reduce the energy consumption of the sensors. A cooperative relay selection algorithm...
The lifetime of Wireless Sensor Networks (WSNs) is significantly shortened by the energy hole problem that is caused by the many-to-one communication pattern adopted by most WSNs. Various approaches have been designed to solve the energy hole problem, and this paper considers improving the energy efficiency by deploying additional relays, which is called the Lifetime Constrained Relay Node Placement...
Nowadays, wideband spectrum sensing, as one of the vital technologies of cognitive radio (CR), has the potential to find more temporarily available frequency bands to meet the growing demands of wireless services. As the vast number of samples are required to be collected and processed, traditional wideband spectrum sensing methods become inefficient and cause large energy consumption. Therefore,...
Cognitive radio networks (CRNs) are vulnerable to various attacks. Primary user emulation attack (PUEA) is one kind of serious attacks. In order to combat PUEA, we propose an algorithm to detect PUEA in CRNs based on probability density function (PDF) assisted by belief propagation (BP), called PDF-BP. In the proposed algorithm, every secondary user (SU) calculates its belief value based on the PDF...
A novel metal-oxide-graphene glucose sensor is demonstrated. The sensor utilizes a graphene variable capacitor (varactor) structure that has the capability to enable passive, wireless sensing, a key advantage for in vivo glucose sensing. The functionalization of graphene using pyrene boronic acid is demonstrated using a self-assembly process, and successful functionalization is demonstrated by a positive...
Sensing of acetone using the quantum capacitance in graphene is demonstrated. The sensor was constructed by using graphene as the top electrode in a metal-oxide-graphene variable capacitor (varactor) structure. The relative capacitance change was found to vary with acetone concentration with a relative capacitance sensitivity, ΔC/C of 1.29 ± 0.04 × 10−4 % / ppmv. The sensor was also found to have...
In this paper, we study data collection in mobile wireless sensor networks (WSNs) assisted by unmanned aerial vehicle (UAV). We focus on randomly deployed mobile sensors along a predefined path with different but constant velocities, and a flying UAV in different heights to collect data from the mobile sensors. As the network topology is changing under the mobility of the UAV and the sensor nodes,...
Well design and coordinated implementation of validation activity is necessary to evaluate the accuracy of remote sensing product. However, validation is not a straightforward task and remain many challenges. A generally recognized difficult issue is the inconsistence between sparse observations and remote sensing pixels, strong spatial and temporal variations of surface variables, and the intrinsic...
Hosting multiple application in a shared infrastructure of wireless sensor networks is a trend nowadays. In this article we propose an energy-efficient query optimization mechanism for supporting multiple applications leveraging our cooperative caching mechanism in shared wireless sensor networks. Specifically, query requests are represented as binary strings, which are reduced to a single one for...
Trust management plays a significant role for guaranteeing the reliability and security of wireless sensor networks. A hierarchical trust model for cluster-based wireless sensor network is proposed. According to the differences between cluster heads and general nodes, the distributed and centralized trust management mechanisms are combined in this paper. In the proposed model, the computation of node...
In cognitive radio networks (CRNs), wideband spectrum sensing is an important task for secondary users (SUs) to achieve the dynamic spectrum access. Even though the wideband spectrum detection is feasible by combining the compressive sensing (CS) with wavelet transform, however, accurate detection of the small-scale primary users (SSPUs) such as wireless microphones and mobile devices is still difficult...
In cognitive radio networks, secondary users (SUs) need to sense/detect the vacant spectrum holes in a wide frequency band for achieve the dynamic spectrum access. The combination of compressive sensing (CS) with wavelet edge detection makes the wideband spectrum reconstruction and detection to be feasible. The existence of small-scale primary users (SSPUs) such as wireless microphones and mobile...
This paper briefly summarizes the technology evolution of Internet-of-Things (IoT) from RFID. The key differences between the internet and the Internet-of-Things have been addressed. Five key technologies for IoT have been summarized and the technical trends of IoT are introduced. The further development of IoT will be driven by the existing urgent demands, namely smart-manufacturing, smart-healthcare...
A novel robust detection algorithm based on goodness-of-fit test is proposed to achieve spectrum sensing for the small-scale primary users (SSPUs) including wireless microphones and mobile devices. In the proposed algorithm, a new test statistic is proposed to measure the non-Gaussianity of the power spectral density (PSD) of the received signals. Since the estimated PSD of the ambient Gauss noise...
A wireless sensor network (WSN) is an energy-constrained system. Energy consumption has always been an important factor to consider in the design of WSN-based localization systems. In existing localization systems, unknown nodes send data to the sink to request for a location at a given period. However, energy is wasted if unknown nodes remain still for a long time. In this paper, we propose a method...
The mathematical modeling is compulsory course for students in mathematics major. Relevant theories of mathematical modeling are summarized in this paper. The current situation of mathematical education is analyzed as well. Since in applied mathematics education, the combination of practice and theory is particularly important, a suitable teaching approach is much eager to educators. According to...
A novel goodness-of-fit testing based spectrum sensing method is proposed to detect the small-scale primary users (SSPUs) such as wireless microphones and mobile devices. In the proposed method, a secondary user (SU) measures the non-Gaussianity of the spectrum of the received signal using a novel test statistic. Then, the absence and presence of SSPUs can be effectively distinguished by evaluate...
Rapid development in wireless sensor device manufacture technologies has made it possible to conglutinate and implant the medical sensors on human body. The improvement of these technologies can be applied to wireless body area network (WBAN) on medical applications. A uniform standard in the field of WBAN, IEEE 802.15.6 has been released recently by IEEE 802.15 TG 6 group, indicating that WBAN will...
A number of multifunction sensors deployed randomly with limited energy is one character of wireless sensor networks, so energy efficient is a critical factor in sensor network design. In this literature, we present a clustering protocol based on Virtual Area Partition using Double Cluster Heads scheme (VAP-DCH) for wireless sensor networks, which partitions the network and selects a Main Cluster...
This study investigates a Wi-Fi-based Wireless Networked Control System. This system is first modified in order to enhance resistance to interference. Then, it is subjected to different types of interference. The system consists of a workcell containing 30 sensors, 30 actuators and 1 controller. All forms of interference modeled focus on the operating frequency band used by the control nodes. All...
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