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arXiv 2025年

作者： Emmerich, Leon Aste, Patrik Brandão, Eric Nolan, Mélanie Cuenca, Jacques Svensson, U. Peter Maeder, Marcus Marburg, Steffen Zea, Elias Department of Engineering Physics and Computation TUM School of Engineering and Design Technical University of Munich Boltzmannstrasse 15 Garching85748 Germany The Marcus Wallenberg Laboratory for Sound and Vibration Research Department of Engineering Mechanics KTH Royal Institute of Technology Teknikringen 8 Stockholm10044 Sweden RS Santa Maria97050-140 Brazil Acoustic Technology Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark Siemens Industry Software NV Interleuvenlaan 68 Leuven3001 Belgium Department of Electronic Systems Norwegian University of Science and Technology Trondheim Norway

This work presents a data-driven approach to estimating the sound absorption coefficient of an infinite porous slab using a neural network and a two-microphone measurement on a finite porous sample. A 1D-convolutional network predicts the sound absorption coefficient from the complex-valued transfer function between the sound pressure measured at the two microphone positions. The network is trained and validated with numerical data generated by a boundary element model using the Delany-Bazley-Miki model, demonstrating accurate predictions for various numerical samples. The method is experimentally validated with baffled rectangular samples of a fibrous material, where sample size and source height are varied. The results show that the neural network offers the possibility to reliably predict the in-situ sound absorption of a porous material using the traditional two-microphone method as if the sample were infinite. The normal-incidence sound absorption coefficient obtained by the network compares well with that obtained theoretically and in an impedance tube. The proposed method has promising perspectives for estimating the sound absorption coefficient of acoustic materials after installation and in realistic operational conditions. © 2025, CC BY.

关键词： Acoustic impedance

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Implementation of programmable digital sigmoid function circuit for neuro-computing

Implementation of programmable digital sigmoid function circ...

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1998 Midwest Symposium on Circuits and systems, MWSCAS 1998

作者： Al-Nsour, Mahmoud Abdel-Aty-zohdy, Hoda S. Department of Electrical and Systems Engineering Microelectronics Systems Design Laboratory Oakland University RochesterMI48309-4401 United States

ISBN: (纸本)0818689145

A programmable digital sigmoid function generator circuit has been designed and implemented. The circuit is based on second order approximation of the nonlinear sigmoid function and utilizing its characteristics. It offers an easy way of changing the steepness of the function in the transition state. In addition, the squaring function operation was implemented using combinational logic. This offers a compact realization of the system as a parallel bit architecture. The maximum output error is.047 and the average error is within 0.01. Simulations show that the circuit operates satisfactorily up to 50 MHz. The digital VLSI circuit has been fabricated using MOSIS/AMI N-well 1.2 μm CMOS double metal process. It occupies an area of 900×450 μm2. © 1999 IEEE.

关键词： Timing circuits

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Energy diffusion model of bR for voxel identification

Energy diffusion model of bR for voxel identification

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2005 IEEE International 48th Midwest Symposium on Circuits and systems, MWSCAS 2005

作者： Neto, Didimo Garcia Abdel-Aty-Zohdy, Hoda S. Microelectronics System Design Laboratory Department of Electrical and Systems Engineering Oakland University Rochester United States

ISBN: (纸本)0780391977

In this paper, a potential biological structure for computer volumetric memory is investigated. Bacteriorhodopsin is a protein found in the purple membrane of the bacteria Halobacterium salinarum. This protein has light absorption properties that generate different stable states allowing the use of multi-level logic as well as binary logic. CHARMm™ has been used to simulate the energy response of Bacteriorhodopsin at room temperature 300K for the bR ground state and the other states. The K state takes place after blue light (λ= 635nm) absorption on the bR state. The energy difference is found to be an increase of 1086.92 kcal/mol which is responsible for triggering the photocycle that also includes the states K, L, M, N, and O. An energy surplus is found between 6 and bR state that may be spread to surrounding molecules. However, conformational interference will not produce photons necessary for the isomerization reaction. Further Quantum Molecular (QM) analysis should provide an extended model for this macromolecular energy study. © 2005 IEEE.

关键词： Storage allocation (computer)

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COMPOSITE MATCHED FILTERING WITH ERROR CORRECTION

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OPTICS LETTERS 1987年第2期12卷 135-137页

作者： MARKS, RJ ATLAS, LE []Interactive Systems Design Laboratory Department of Electrical Engineering FT-10 University of Washington Seattle Washington 98195

Information theory shows that one can communicate with arbitrarily low error probability over a noisy channel. By recognizing that some types of computations can be cast as communications problems, it may be possible to compute accurately with an inexact processor. Traditional analog optical processors, for example, offer advantages of parallelism and speed but suffer from significant inaccuracies. We propose an algorithm whereby the accuracy of matched filter processors can be improved significantly at the cost of a modest increase in computational resources. Errors that are due to noisy data and/or inexact computing can be detected and in some cases corrected.

关键词： .error correction

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A component-invariant second-order switched-current sigma-delta modulator

A component-invariant second-order switched-current sigma-de...

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1992 IEEE International Symposium on Circuits and systems, ISCAS 1992

作者： Crawley, Philip J. Roberts, Gordon W. Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University India

ISBN: (纸本)0780305930

This paper presents the building blocks and design procedure necessary for creating a component-invariant second-order Switched Current (SI) Sigma-Delta Modulator (Σ M). A novel SI second-order integrator block is paramount to the design. A voice-band (4 kHz) A/D converter was designed and laid out in Northern Telecom's 1.2 μm CMOS process. Final transistor level simulations on the netlist derived directly from the layout indicated a resolution of only 10 bits, a result of excessive charge injection and clock feedthrough. © 1992 IEEE.

关键词： Modulators

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Switched-current sigma-delta modulation for A/D conversion

Switched-current sigma-delta modulation for A/D conversion

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1992 IEEE International Symposium on Circuits and systems, ISCAS 1992

作者： Crawley, Philip J. Roberts, Gordon W. Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University India

ISBN: (纸本)0780305930

This paper presents the design of a switched-current (SI) Double-Integrator Sigma-Delta Modulator (DISDM) for A/D conversion that is intended for voice-band (4kHz) telecommunication applications. With the creation of several new SI signal processing building blocks, a SI DISDM has been designed and laid out in Northern Telecom's 1.2 μm CMOS process having an area of 0.5 mm3 and a predicted power consumption of 2.5 mW. Transistor level simulation (SPICE) of the SI DISDM design shows that the circuit performs reasonable well, rating it at 12-bits of linear resolution. In comparisons with corresponding switched-capacitor DISDM designs, the SI version provides a dramatic reduction in both power and area requirements. But, more importantly, the SI design does not utilize linear capacitors and can be fabricated using a standard digital CMOS process. © 1992 IEEE.

关键词： Delta sigma modulation

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Verification system interface for VLSI combinational circuits

Verification system interface for VLSI combinational circuit...

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1998 Midwest Symposium on Circuits and systems, MWSCAS 1998

作者： El-Licy, Fatma A. Abdel-Aty-zohdy, Hoda S. Department of Electrical and Systems Engineering Microelectronics System Design Laboratory Oakland University RochesterMI48309-4401 United States

ISBN: (纸本)0818689145

A proof of correctness of a given VLSIC system design is established by proving the consistency and implication of the implemented design with respect to the specified design. The set of conditions that establish such consistency is termed verification conditions (VCs). This paper presents an automatic interface system for the verification of VLSI combinational circuits in which VCs are synthesized from circuit definition. This interface will allow a top down specification of the design (written in a given HDL language) to be parsed into binary tree structure representation. Also, a logical construct is built up from the physical layout specifications of the implemented design (extracted as SPICE file). The top down parse tree along with bottom up logic constructs form the basic building block structure of the front end of the interface system. VCs are then synthesized from the outcomes of the front end through a preprocessor. The back end of the interface system constitutes the preprocessor and a set of designators and modules for manipulating mathematical and logical operations. It provides an environment in which a theorem prover can be used to create a formal proof schema for the VCs which satisfy partial correctness of the circuit under consideration. © 1999 IEEE.

关键词： Specifications

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A hardware implementation of genetic algorithms for measurement characterization

A hardware implementation of genetic algorithms for measurem...

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9th IEEE International Conference on Electronics, Circuits and systems, ICECS 2002

作者： Sharawi, Mohammad S. Quinlan, James Abdel-Aty-Zohdy, Hoda S. Microelectronics System Design Laboratory Electrical and Systems Engineering Oakland University Rochater MI 48309 United States

ISBN: (纸本)0780375963

Integrated circuits that sense, receive, transmit, and process signals are the eye, ears, and nose of the hitechnical field of the millennium. To process/store/analyee signals acquired from sensors, hybrid systems with Rexible and adaptable Intelligent Information Processing and Perception (IIPP) are needed. Genetic Algorithms (GA) present a suitable pre-processing operation hecause of their good convergence to optimum solutions and characterination capabilities. Most of GAs are built via software because of their ease of editing and eustomization. Less attention has been given to hardware implementation of such algorithms. In this paper we present a hardware design approach of a GA for optimum measurements representationjcharacterization to a following IIPP stage. A multilevel verification of the GA is performed via VHDL. In particular the design of efficient universal multipliers and dividers is addressed. A new time efficient approach for Crossover based on preassigned least error value is proposed. The Crossover scheme is called Half Siblings and D Clone. Such a scheme needs 10 iterations to converge the system proposed for sensor measurement characterization. This takes 7680 clock cycles, which is only 96 μsec when implemented in the 0.25 pm CMOS technology. © 2002 IEEE.

关键词： Genetic algorithms

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ANALYSIS OF 3-D MICROWAVE RESONATORS USING COVARIANT-PROJECTION ELEMENTS

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1991年第11期39卷 1895-1899页

作者： WEBB, JP MINIOWITZ, R Computational Analysis and Design Laboratory Department of Electrical Engineering McGill University Montreal QUE Canada Electromagnetics Department RAFAEL Advanced Defense Systems Limited Haifa Israel

Three-dimensional microwave resonators of arbitrary shape can be analyzed with the finite element method using covariant-projection elements, curvilinear bricks which impose only tangential field continuity. The method produces no spurious modes, and works well even when sharp metal edges are present. The matrices involved, though large, are sparse;an appropriate sparse eigenvalue algorithm allows the method to run in modest amounts of memory. Results are presented for a number of test cases, including a rectangular microstrip resonator.

关键词： Finite element methods Magnetic resonance Shape Eigenvalues and eigenfunctions Microwave devices Magnetic fields Magnetic analysis Microwave theory and techniques Covariance matrix Sparse matrices

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Liquid hydrogen storage, thermal management, and transfer-control system for integrated zero emission aviation (IZEA)

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Applied Energy 2025年 393卷

作者： Virdi, Parmit S. Guo, Wei Cattafesta, Louis N. Cheetham, Peter Cooley, Lance Gladin, Jonathan C. He, Jiangbiao Kim, Chul Li, Hui Ordonez, Juan Pamidi, Sastry Zheng, Jian-Ping Mechanical Engineering Department FAMU-FSU College of Engineering 2525 Pottsdamer St TallahasseeFL32310 United States National High Magnetic Field Laboratory 1800 E Paul Dirac TallahasseeFL32310 United States Illinois Institute of Technology 10 West 32th Street ChicagoIL60616 United States Electrical and Computer Engineering Department FAMU-FSU College of Engineering 2525 Pottsdamer St TallahasseeFL32310 United States Center for Advance Power Systems 2000 Levy Avenue TallahasseeFL32310 United States Applied Superconductivity Center 2031 E Paul Dirac Dr TallahasseeFL32310 United States Daniel Guggenheim School of Aerospace Engineering Georgia Tech North Avenue AtlantaGA30332 United States Aerospace Systems Design Laboratory 275 Ferst Drive NW AtlantaGA30332 United States Department of Electrical Engineering and Computer Science University of Tennessee 1520 Middle Dr KnoxvilleTN37996 United States Department of Electrical Engineering University at Buffalo 230 Davis Hall University at Buffalo North Campus BuffaloNY14260 United States

The rapid growth of the aviation sector underscores the urgent need to reduce carbon and contrail emissions, key contributors to climate change. Hydrogen, with its high specific chemical energy, emerges as a promising clean fuel alternative. To promote sustainable aviation, we propose an innovative design for a liquid hydrogen storage, thermal management, and transfer-control system tailored for Integrated Zero Emission Aviation (IZEA). Our design harnesses the cooling power of liquid hydrogen to manage the temperature and thermal loads on essential power system components. By regulating the pressure in the storage tank, we demonstrate the feasibility of delivering the required hydrogen mass flow rates—up to 0.25 kg/s—to meet a peak power demand of 16.2 MW for a prototype 100-passenger hybrid-electric aircraft, while efficiently cooling the power system using practical heat exchangers. Through comprehensive system-level optimization, we have identified the optimal tank and heat exchanger configurations that maximize the overall gravimetric index to a value of 0.62, where the index is defined as the ratio of the hydrogen fuel mass to the total mass of the fuel, storage tank, and thermal management system. Our findings emphasize the critical importance of system-level optimization in determining key design parameters, paving the way for zero-emission aviation technologies and advancing environmental sustainability in the aviation industry. © 2025 The Author(s)

关键词： Air conditioning

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