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The impact of position sensing dynamics, including time-delays caused by magnetics, electrical transmission of sensed signals and A/D conversion, on feedforward current control of permanent magnet synchronous machine (PMSM) drive systems are presented in this paper. Further, the effect of misalignment of the position sensor zero with the machine back-EMF is also presented. The different error sources...
The Internet of Underground Things (IOUT) has many applications in the area of smart lighting. IOUT enables communications in smart lighting through underground (UG) and aboveground (AG) communication channels. In IOUT communications, an in-depth analysis of the wireless underground channel is important to design smart lighting solutions. In this paper, based on the empirical and the statistical analysis,...
To secure a Vehicular Ad-hoc Network (VANET), extensive studies have been conducted on developing authentication infrastructures, and identifying misbehaving vehicles. The effectiveness of such efforts heavily depends on the underlying communication network. However, information exchange in the VANET can be severely delayed because of its highly-dynamic and partially-connected topology. Such delay...
In this paper, we consider a scenario where an energy harvesting sensor continuously monitors a system and sends time-stamped status updates to a destination. The destination keeps track of the system status through the received updates. We use the metric Age of Information (AoI), the time that has elapsed since the last received update was generated, to measure the “freshness” of the status information...
The networked control systems (NCSs) have nowadays applications ranging from factory and home automation, to automotive and avionic control systems and to military and spatial applications. Their widely inclusion in the industry was mainly due to the inherent advantages, e.g. lower costs, simpler installation and maintenance, higher reliability and greater flexibility. Although the subject was extensively...
Device to device (D2D) communication is essential in Internet of things (IoT). Cognitive radio (CR)-enabled device is a promising technique to address D2D communications. Among all the functions supported in IoT, priority-based spectrum access is less investigated yet urgently desired in IoT. An important operation to achieve this capacity is channel hopping (CH) based rendezvous which allows two...
In this paper, a new approach to event-triggered H∞ performance analysis of linear networked control systems is proposed. First, a new parametrization of event-triggering scheme is designed, in which a positive diagonal parameter matrix with n elements (corresponding to the dimension of the system under consideration) is introduced, resulting in different weights for each state component. Under this...
We consider a class of pursuit-evasion problems where an evader enters a directed acyclic graph and attempts to reach one of the terminal nodes. A pursuer enters the graph at a later time and attempts to capture the evader before it reaches a terminal node. The pursuer can only obtain information about the evader's path via sensors located at each node in the graph; the sensor measurements are either...
The access sequence and the number of nodes have a significant impact on the performance of agent-based data gathering in a network. This paper proposes an energy-efficient routing strategy for mobile agent (ERS) in wireless sensor networks (WSNs). ERS integrates the advantages of clustering and the mobile agent. By constructing a cost function, an optimal route for a mobile agent between the sink...
The problem of variable structure guaranteed cost control for discrete uncertain networked systems with time delay has been considered in this paper. Based on the Lyapunov stability theorem, by introducing a discrete compensator, a novel sliding mode manifold that can compensate time delay has been designed. Then, by using linear matrix inequalities approach, a guaranteed cost controller is designed...
A new decentralized hypothesis detection framework is developed, where local sensors are memoryless, receive independent observations, and minimum feedback from the fusion center. In addition to the standard criterion of minimizing detection delay under error probability constraints, an additional constraint on the number of communications between local sensors and the fusion center is introduced...
This paper proposes an efficient interactive model for sensor-cloud integration to enable the sensor-cloud to provide on-demand sensing services for multiple applications with different latency requirements at the same time. In the model, we design an aggregation mechanism for the sensor-cloud to aggregate application requests so that workloads required for constrained sensor nodes are minimized to...
In this paper, a model-based event-triggered control law is adopted to reduce communication traffic in networked control systems. In this model-based control system, a nominal model of system plant is used to estimate the system state between two sampling instants. By simultaneously considering bounded system noise and bounded network delay, a mixed event-triggering mechanism is proposed to stabilize...
Both traditional wireless sensor networks and novel crowdsensing techniques generate tremendous real- time data, which provides great opportunities for real- time and long-term analytics. However, how to integrate the heterogeneous data sources and create data analytics toolboxes that can be connected together to solve various problems in urban environment remains open problems. As a PhD student,...
An observer design method is presented for a class of systems subject to sensor delay of any size. Accordingly, the delay is modelled by a first-order hyperbolic PDE, leading to an ODE-PDE cascade representation of the system. Then, a new observer is developed that relies on the full-order feedback-predictor PDE-based design and on the chain-predictor principle, so far only developed in the ODE framework...
Sleep Apnea Hypopnea Syndrome (SAHS) is a sleep disorder where patients experience multiple airflow cessations or reductions during the night. It is recognized as a common condition with a population prevalence of 1% to 6.5%. The Apnea Hypopnea Index (AHI) characterizes the severity of SAHS using signals obtained from Polysomnography (PSG); this requires the use of multiple sensors on the patient...
Cognitive radio networks (CRNs) have a great potential in supporting time-critical data delivery among the Internet of Things (IoT) devices and for emerging applications such as smart cities. However, the unique characteristics of different technologies and shared radio operating environment can significantly impact network availability. Hence, in this paper, we study the channel assignment problem...
Priority queue-based techniques improve spectrum efficiency by allocating the underutilized spectral bands (holes) of primary users to secondary users in Cognitive Radio Networks (CRN). This article proposes a Distributed Precedence Queuing scheme for Efficient Spectrum Management (DPQESM) in CRNs. The proposed method classifies the available channels into periodic and aperiodic based on the state...
Code dissemination is an important and challenging task in wireless sensor networks (WSNs). Although there are a lot of dissemination protocols, the situation where small subset of nodes requires the code, such as a WSN shared among multiple users, is not considered. Some prior works have proposed dissemination protocols using high power sensors or clustering to enable efficient dissemination for...
We introduce the system level approach to controller synthesis, which is composed of three elements: System Level Parameterizations (SLPs), System Level Constraints (SLCs) and System Level Synthesis (SLS) problems. SLPs provide a novel parameterization of all internally stabilizing controllers and the system responses that they achieve. These can be combined with SLCs to provide parameterizations...
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