Giada Giorgi

Bio: Giada Giorgi is an academic researcher from University of Padua. The author has contributed to research in topics: Synchronization & Clock synchronization. The author has an hindex of 12, co-authored 66 publications receiving 588 citations.

Performance Analysis of Kalman-Filter-Based Clock Synchronization in IEEE 1588 Networks

Abstract: Performances in network-based synchronization depend on several related factors, including the instability of local clocks, the rate at which timing information is exchanged, and the accuracy of the resulting correction estimates. This paper analyzes these effects and their relationships, showing how these may affect the design of an IEEE 1588 Precision Time Protocol synchronization scheme. This paper introduces a state-variable clock model for which realistic parameters can be obtained for different kinds of clocks from experimental measurements of Allan variance plots. A Kalman-filter-based clock servo employing this model is developed, and a simulation analysis of the behavior of clock regulation and the effect of parameter variations on its performances is presented.

Fast -TFM—Multifrequency Phasor Measurement for Distribution Networks

Abstract: To effectively manage the growing number of distributed energy resources, more extensive monitoring is needed at distribution network levels, where a challenging combination of constraints and cost-effectiveness requirements must be taken into account. In this paper, we consider the idea of combining accurate phasor measurement with the capability to analyze harmonic and interharmonic phasors. This creates the need to deal with multiple phasor components having different amplitudes, including interharmonics with unknown frequency locations. For this purpose, we propose an enhanced compressive sensing-based algorithm for the estimation of Taylor–Fourier coefficients in a multifrequency dynamic phasor model. We characterize its accuracy in harmonic and interharmonic phasor measurement and discuss reporting rate and latency performance. We show that very good accuracy can also be achieved as a standard phasor measurement unit, allowing to combine multiple functions into a promising new-generation measurement, monitoring, and diagnostic device.

Measuring Heart Rate During Physical Exercise by Subspace Decomposition and Kalman Smoothing

Abstract: Monitoring of health parameters during physical exercise is an important aspect of both sports and rehabilitation medicine. Photoplethysmography (PPG) is routinely employed for low-cost heart rate (HR) measurement; however, monitoring during physical exercise is made difficult by the presence of motion artifacts. In this paper, we present an approach that combines denoising by subspace decomposition and Fourier-based HR measurement, and finally, smoothing and tracking by a Kalman filter. Using publicly available real-life PPG traces, we demonstrate accuracy and performance by an extensive set of experimental results, comparing them with similar algorithms proposed in the literature.

Performance analysis of Kalman filter-based clock synchronization in IEEE 1588 networks

Abstract: This paper analyzes the effects on synchronization performances of the accuracy of skew and offset estimates, the short and long-term stability of the unregulated clock, the rate at which timing information is exchanged within the network The work makes use of a simulated clock based on the state-variable model, for which realistic parameters are obtained from experimental measurements of Allan variance plots for different kinds of clocks

Investigating WirelessHART coexistence issues through a specifically designed simulator

Abstract: In this paper, the WirelessHART communication scheme is investigated. The protocol is at first described, in order to underline the key aspects of its design; then, a simulation tool is presented: it enables analysis that accounts for both protocol and physical layers issues. In particular, interference effects on protocol choices can be easily analyzed. The experimental results, obtained from simulations, highlight improvements of WirelessHART with respect to IEEE 802.15.4 standard, concerning the Packet Error Ratio (PER) degradation of interfering networks.

Introduction to Functional Magnetic Resonance Imaging, Principles and TechniquesIntroduction to Functional Magnetic Resonance Imaging, Principles and Techniques. By BuxtonR. B.. Cambridge University Press, Cambridge2002. ISBN 0-521-58113-3. 536 pages 134 line diagrams, 34 halftone figures. Price hardback: GBP 95.00.

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An Industrial Perspective on Wireless Sensor Networks — A Survey of Requirements, Protocols, and Challenges

Abstract: Wireless Sensor Networks (WSNs) are applicable in numerous domains, including industrial automation where WSNs may be used for monitoring and control of industrial plants and equipment. However, the requirements in the industrial systems differ from the general WSN requirements. In recent years, standards have been defined by several industrial alliances. These standards are specified as frameworks with modifiable parts that can be defined based on the particular application of WSN. However, limited work has been done on defining industry-specific protocols that could be used as a part of these standards. In this survey, we discuss representative protocols that meet some of the requirements of the industrial applications. Since the industrial applications domain in itself is a vast area, we divide them into classes with similar requirements. We discuss these industrial classes, set of common requirements and various state-of-the-art WSN standards proposed to satisfy these requirements. We then present a broader view towards the WSN solution by discussing important functions like medium access control, routing, and transport in detail to give some insight into specific requirements and the classification of protocols based on certain factors. We list and discuss representative protocols for each of these functions that address requirements defined in the industrial classes. Security function is discussed in brief, mainly in relation to industrial standards. Finally, we identify unsolved challenges that are encountered during design of protocols and standards. In addition some new challenges are introduced and discussed.

Smart Microgrids: Optimal Joint Scheduling for Electric Vehicles and Home Appliances

Abstract: The integration of renewable energy sources and electrical vehicles (EVs) into microgrids is becoming a popular green approach. To reduce greenhouse gas emissions, several incentives are given to use renewable energy sources and EVs. By using EVs as electricity storage and renewable energy sources as distributed generators (DGs), microgrids become more reliable, stable, and cost-effective. In this paper, we propose an optimal centralized scheduling method to jointly control the electricity consumption of home appliances and plug-in EVs as well as to discharge the latter ones when they have excess energy, thereby increasing the reliability and stability of microgrids and giving lower electricity prices to customers. We mathematically formulate the scheduling method as a mixed integer linear programming (MILP) problem and solve it to optimality. We compare the optimal solution to that obtained from a scheduling framework, where EVs do not have discharge capabilities, decentralized charge control using game theory and to a solution obtained from a naive scheduling framework.