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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Tomkos, I. Papapavlou, Ch. Uzunidis, D. Moschopoulos, K. Muñoz, R. Marom, D.Μ. Nazarathy, M. Department of Electrical and Computer Engineering University of Patras Patras26504 Greece Castelldefels08860 Spain Institute of Applied Physics Hebrew University of Jerusalem Jerusalem91904 Israel Faculty of Electrical and Computer Engineering Technion Israel Institute of Technology Haifa3200 Israel

We describe innovative concepts associated with optical switching nodes and their transceiver interfaces that enable energy-efficient flexible capacity scaling (≥10 Tb/s per interface, ≥1 Pb/s capacity per link and ... 详细信息

关键词： Optical fiber communication

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Free-electron crystals for enhanced X-ray radiation

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Light(Science & Applications) 2024年第7期13卷 1299-1309页

作者： Lee Wei Wesley Wong Xihang Shi Aviv Karnieli Jeremy Lim Suraj Kumar Sergio Carbajo Ido Kaminer Liang Jie Wong School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore. Solid State Institute and Faculty of Electrical and Computer Engineering Technion–Israel Institute of TechnologyHaifa 3200003Israel. School of Electrical Engineering Fleischman Faculty of EngineeringTel Aviv UniversityTel Aviv 69978Israel Department of Applied Physics Stanford UniversityStanfordCA 94305USA. Science Mathematics and TechnologySingapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore. Electrical and Computer Engineering Department UCLA420 WestwoodLos AngelesCA 90095USA. Physics and Astronomy Department UCLA475 Portola PlazaLos AngelesCA 90095USA. SLAC National Accelerator Laboratory Stanford University2575 Sand Hill RoadMenlo ParkCA 94025USA

Bremsstrahlung—the spontaneous emission of broadband radiation from free electrons that are deflected by atomic nuclei—contributes to the majority of X-rays emitted from X-ray tubes and used in applications ranging from medical imaging to semiconductor chip ***,we show that the bremsstrahlung intensity can be enhanced significantly—by more than three orders of magnitude—through shaping the electron wavefunction to periodically overlap with atoms in crystalline ***,we show how to shape the bremsstrahlung X-ray emission pattern into arbitrary angular emission profiles for purposes such as unidirectionality and ***,we find that these enhancements and shaped emission profiles cannot be attributed solely to the spatial overlap between the electron probability distribution and the atomic centers,as predicted by the paraxial and nonrecoil theory for free electron light *** work highlights an unprecedented regime of free electron light emission where electron waveshaping provides multi-dimensional control over practical radiation processes like *** results pave the way towards greater versatility in table-top X-ray sources and improved fundamental understanding of quantum electron-light interactions.

关键词： overlap attributed arbitrary

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A New Pulse Skipping Control for Series Resonant Converter 3

A New Pulse Skipping Control for Series Resonant Converter

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3rd IEEE Industrial Electronics Society Annual On-Line Conference, ONCON 2024

作者： Bhowmick, Supratik Chakraborty, Soham Maiti, Suman Indian Institute of Technology Kharagpur Department of Electrical Engineering Kharagpur721302 India Calcutta University UG Program of Electrical Engineering Department of Applied Physics Kolkata700009 India

ISBN: (纸本)9798331540319

This paper proposes a pulse skipping based combined frequency and duty ratio control for a series resonant converter which is targeted for voltage regulator applications. The proposed pulse skipping control combines duty ratio based phase shifted control for maintaining output voltage at its reference value, along with frequency based control which assists in development of the pulse skipping algorithm. This algorithm is structured so that pulses are skipped in generated gate pulses for upper switching devices present in the converter whenever the output voltage tries to be higher than its specified maximum value or be lower than its specified minimum value. These maximum and minimum voltages are determined based on its reference voltage and allowable voltage ripple within which the oscillations in output voltage are desired to be in. The converter system with the proposed control method is simulated in MATLAB/Simulink environment to validate its performance under transient conditions e.g., variation in load resistance and output voltage reference. The system performance with proposed method is also compared with conventional method where the proposed control demonstrates its superiority by significantly minimizing the output voltage ripple. © 2024 IEEE.

关键词： Resonant converters

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State-Space Modeling of Nonlinear Electrostatic Transducers and Experimental Characterization Using LDV 41st

State-Space Modeling of Nonlinear Electrostatic Transducers ...

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41st IMAC, A Conference and Exposition on Structural Dynamics, 2023

作者： Meng, Yuqi Niu, Xiaoyu Williams, Randall P. Vatankhah, Ehsan Liu, Zihuan Hall, Neal A. Chandra Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX United States Applied Physics Laboratory University of Washington SeattleWA United States

ISBN: (纸本)9783031369988

Electrostatic speakers and ultrasound transmitters, including capacitive micromachined ultrasound transducers (CMUTs), may be thought of as systems with applied voltage as the input variable and diaphragm displacement and sound pressure as the output variables. These electrostatically actuated systems are inherently nonlinear. Electrostatic pressure is proportional to the square of the applied voltage and is inversely proportional to the cube of the time-varying diaphragm-backplate gap spacing. The squeeze film damping coefficient is also dependent on the time-varying gap spacing. For large diaphragm displacement, strain stiffening of the diaphragm can also affect the transducer dynamics. These nonlinear systems are most commonly driven in a linear regime, whereby the moving diaphragm is biased to an operating point with a large static voltage and a relatively small dynamic signal voltage is superimposed to provide actuation of the diaphragm. In recent work, we have demonstrated advantages of exploiting the full operating range of electrostatic transducers, not restricted to a linear operating regime. Our recent focus has been on using commonly available MEMS microphone structures as airborne ultrasonic projectors at frequencies of up to 100 kHz. Although designed as receivers to work in the audible range, these commercial devices are effective as ultrasound transmitters. A large dynamic input voltage is applied to force the diaphragm to traverse the full diaphragm-backplate gap, typically 2 μ m. Electrostatic pull-in,whereby the diaphragm contacts the backplate,can be exploited as a braking feature to instantaneously eliminate diaphragm ring-down and increase the bandwidth of generated waveforms. Having an accurate model for these nonlinear devices is advantageous. A state-space model based on a segmented diaphragm approach has recently been summarized in prior work. The model is suitable for time-domain simulations of the movement of the diaphragm in response to i

关键词： Diaphragms

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Rapid computational algorithm with minimum user input for reconstructing phase images in structured illumination Digital Holographic Microscopy

Rapid computational algorithm with minimum user input for re...

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3D Image Acquisition and Display: Technology, Perception and Applications, 3D 2024 - Part of Optica Imaging Congress

作者： Obando-Vásquez, Sofía Castaneda, Raúl Restrepo, René Trujillo, Carlos Doblas, Ana Applied Optics Group School of Applied Science and Engineering EAFIT University Medellin Colombia Electrical and Computer Engineering Department University of Massachusetts Dartmouth United States

A rapid computational algorithm is presented for Structured Illumination in Digital Holographic Microscopy. The proposed algorithm is based on the minimization of two cost functions to reconstruct improved resolution ... 详细信息

关键词： Cost functions

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Feature-oriented Digital Twins for Life Cycle Phases Using the Example of Reliable Museum Analytics 8th

Feature-oriented Digital Twins for Life Cycle Phases Using t...

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8th International Symposium on Reliability engineering and Risk Management, ISRERM 2022

作者： Luther, W. Auer, E. Sacher, D. Baloian, N. Department of Computer Science and Applied Cognitive Science University of Duisburg-Essen Germany Electrical Engineering and Computer Science Wismar University of Applied Sciences Germany Department of Computer Science University of Chile Santiago Chile

ISBN: (纸本)9789811851841

In this paper, we consider partial, feature-oriented digital twins of several virtual museums and formulate an approach to assessing them from the viewpoint of their reliability. Although the formulation specifically concerns the chosen application, it can be extended to any kind of feature-oriented digital twin. The features of a virtual museum that define its scope and focus fit into three broad categories: content, communication and collaboration. Moreover, any virtual museum needs to be risk-informed, that is, seek to support the communication and perception of different types of risks from a variety of threat categories. At the same time, appropriate algorithms should identify and analyze different types of risks for museums’ buildings, visitors, exhibitions, and pieces of art with the help of sensor data, operating rules and standards, in this way supporting stakeholders’ decision making. Using comprehensible quality criteria and their metrics, formal assessment can be carried out with the help of formulated requirements, ground truth data and related standards from the involved professional associations. Additionally, empirical assessment based on user surveys can be conducted during the museum’s lifetime. Aside from various realizations or interactive learning systems, the use cases we base our analysis on are a joint project with the Museo de Arte Contemporâneo (MAC, Santiago de Chile);a digital representation of largely destroyed works by German-Jewish sculptor Leopold Fleischhacker, a joint project initiated by the Salomon Ludwig Steinheim-Institute in Essen, presented onsite at the Düsseldorf Memorial to the Victims of Persecution;and the virtual Khachkar Museum dedicated to endangered Armenian cross stones in cooperation with the American University of Armenia. © 2022 ISRERM Organizers. Published by Research Publishing, Singapore.

关键词： Risk assessment

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Dynamical Casimir effects: The need for nonlocality in time-varying dispersive nanophotonics

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Physical Review A 2024年第4期110卷 L041502页

作者： S. Ali Hassani Gangaraj George W. Hanson Francesco Monticone Optical Physics Division Department of Electrical Engineering School of Electrical and Computer Engineering

We study the role of material nonlocality (spatial dispersion) in dynamical Casimir effects in time-varying frequency-dispersive nanophotonic systems. We first show that local models may lead to nonphysical predictions, such as diverging emission rates of entangled polariton pairs. We then theoretically demonstrate that nonlocality regularizes this behavior by correcting the asymptotic response of the system for large wave vectors and leads to physical effects missed by local models, including a significant broadening of the emission rate distribution, which are relevant for future experimental observations. Our work sheds light on the importance of nonlocal effects in this new frontier of nanophotonics.

关键词： Casimir effect & related phenomena Nanophotonics Quantum optics

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Machine Learning Applications for Online Partial Discharge Detection, Classification, and Localization in Power Transformers: A Review 4

Machine Learning Applications for Online Partial Discharge D...

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4th International Conference on Smart Grid and Renewable Energy, SGRE 2024

作者： Tag, Ameera Refaat, Shady S. Kameli, Sayed Mohammad Saleh, Mohammad Alshaikh Texas A&M University at Qatar Electrical and Computer Engineering Department Doha Qatar University of Hertfordshire School of Physics Engineering and Computer Science Department of Engineering United Kingdom Texas A&M University Department of Electrical and Computer Engineering College Station United States

ISBN: (纸本)9798350306262

The power transformer is a crucial asset and a fundamental component of the power grid. Assets undergo aging due to the stresses present in insulation materials. Partial discharges (PDs) are the most common fault source in power transformers and an excellent indicator of aging. The detection, classification, and localization of PD activities in power transformers are persisting challenges, while techniques utilizing machine learning (ML) are widely sought to deal with those challenges. Existing ML techniques show promising results with an elevated level of accuracy and precision. However, there is a lack of conventional ML-based real-time monitoring capability. Therefore, this paper presents a comprehensive review of the application of ML techniques for online PD activity detection, classification, and localization in power transformers, focusing on supervised, unsupervised, semi-supervised, and reinforcement learning techniques. In addition, this paper explores the challenges, future trends, perspectives, and outlook of machine learning for online transformer fault analysis. © 2024 IEEE.

关键词： Partial discharges

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Performance Optimization of Series Resonant Converter by Combined Frequency and Duty Ratio Control 3

Performance Optimization of Series Resonant Converter by Com...

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3rd IEEE Industrial Electronics Society Annual On-Line Conference, ONCON 2024

作者： Chakraborty, Soham Bhowmick, Supratik Maiti, Suman Calcutta University UG Program of Electrical Engineering Department of Applied Physics Kolkata700009 India Indian Institute of Technology Kharagpur Department of Electrical Engineering Kharagpur721302 India

ISBN: (纸本)9798331540319

Resonant converters are widely used for voltage regulator applications. The basic converters i.e., Series resonant Converter (SRC) and Parallel Resonant Converter (PRC) are having some merits and limitations. These are addressed in multi element topologies at the cost of adding extra elements. This work takes up the SRC and reports a combined frequency and duty ratio control for performance optimization of the SRC. The key issue of SRC is that the voltage cannot be controlled at a low Q (i.e. Quality factor) operation. For example, at no load Q becomes zero making the converter inert to frequency variation. This however can be eliminated by pulse width modulation technique. Duty ratio can be properly controlled to achieve the output voltage at an extended load range. The work further takes up challenge to make efficiency optimized. For this a combined control of duty ratio and frequency are proposed. Efficiency Optimization Control (EOC) requires two voltage sensors (one at the input side and another at the output) and a current sensor. Following this, a new minimum rms current algorithm is developed that only requires a current and a voltage sensor. All the proposed techniques are simulated and verified using MATLAB/Simulink. © 2024 IEEE.

关键词： Resonant converters

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Vulnerabilities and Challenges in the Development of PUF-Based Authentication Protocols on FPGAs: A Brief Review 7

Vulnerabilities and Challenges in the Development of PUF-Bas...

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7th IEEE Conference on Dependable and Secure Computing, DSC 2024

作者： Yavuz, Sinan Naroska, Edwin Daniel, Kai University of Siegen Department of Electrical Engineering and Computer Science Siegen Germany Niederrhein University of Applied Sciences Department of Electrical Engineering and Computer Science Krefeld Germany Institute of Measurement and Sensor Technology University of Applied Sciences Ruhr West Mülheim Germany

ISBN: (纸本)9798331540289

The security of IoT (Internet of Things) devices and the protection of sensitive information processed by these devices such as personal data, sensor values, process-related information is an important and difficult challenge. A major task in IoT communication is secure identification of devices. Unfortunately, traditional cryptographic methods are often not suitable for IoT devices due to their limited hardware resources. However, typical methods are computationally intensive, require a large amount of memory, and have a high-power consumption. On the other hand, Physical Unclonable Functions (PUFs) are low-cost and lightweight hardware-based primitives that can be used as a security component to protect data against third parties and thus increase security of a device. In this paper, the challenges and vulnerabilities in the development of PUF-based authentication protocols are presented. To this end, a security analysis of different approaches known from literature are discussed. Furthermore, possible attack vectors and prevention techniques are also considered. © 2024 IEEE.

关键词： Authentication Protocol

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