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Proceedings of the 38th International Conference on Neural Information Processing Systems

作者： Francisco Acosta Fatih Dinc William T. Redman Manu Madhav David Klindt Nina Miolane Department of Physics UC Santa Barbara CNC Program Stanford University Applied Physics Laboratory Johns Hopkins University Biomedical Engineering University of British Columbia NeuroAI CSHL Electrical & Computer Engineering UC Santa Barbara

ISBN: (纸本)9798331314385

Grid cells in the mammalian brain are fundamental to spatial navigation, and therefore crucial to how animals perceive and interact with their environment. Traditionally, grid cells are thought support path integration through highly symmetric hexagonal lattice firing patterns. However, recent findings show that their firing patterns become distorted in the presence of significant spatial landmarks such as rewarded locations. This introduces a novel perspective of dynamic, subjective, and action-relevant interactions between spatial representations and environmental cues. Here, we propose a practical and theoretical framework to quantify and explain these interactions. To this end, we train path-integrating recurrent neural networks (piRNNs) on a spatial navigation task, whose goal is to predict the agent's position with a special focus on rewarded locations. Grid-like neurons naturally emerge from the training of piRNNs, which allows us to investigate how the two aspects of the task, space and reward, are integrated in their firing patterns. We find that geometry, but not topology, of the grid cell population code becomes distorted. Surprisingly, these distortions are global in the firing patterns of the grid cells despite local changes in the reward. Our results indicate that after training with location-specific reward information, the preserved representational topology supports successful path integration, whereas the emergent heterogeneity in individual responses due to global distortions may encode dynamically changing environmental cues. By bridging the gap between computational models and the biological reality of spatial navigation under reward information, we offer new insights into how neural systems prioritize environmental landmarks in their spatial navigation code.

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Junction Configuration Effects on the Photovoltaic Parameters of a-Si/Cu2ZnSnS4 Solar Cells

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applied Solar Energy (English translation of Geliotekhnika) 2022年第2期58卷 198-202页

作者： Bitam, H. Zaidi, B. Hadjoudja, B. Shekhar, C. Gagui, S. Ullah, M.S. Department of Physics Faculty of Matter Sciences University of Batna 1 Batna Algeria Laboratory of Semiconductors Department of Physics University of Badji-Mokhtar Annaba Algeria Department of Physics Amity School of Applied Sciences Amity University Gurgaon Haryana122413 India Department of Electrical and Computer Engineering Florida Polytechnic University Lakeland United States

Abstract: Due to increased energy intensive human activities resulting in accelerated demand for electric power coupled with the occurrence of natural disasters with increased frequency, intensity, and duration, it becomes essential to explore and advance renewable energy technology for the sustainability of the society. To meet the energy demand of the future, more energy resources and energy conversion/harvesting technologies with higher efficiencies are needed. Addressing the problem and providing a radical solution have been attempted in this study. To harvest the renewable energy, among variety of solar cells reported, a composite a-Si/CZTS photovoltaic device has not yet been investigated. The calculated parameters for solar cells based on the new array of layers consisting of a-Si/CZTS are reported in this study. The variation of (i) solar cell efficiency as a function of Cu2ZnSnS4 (CZTS) layer thickness, temperature, acceptor, and donor defect concentration;(ii) variation of the open-circuit current density as a function of temperature, open circuit voltage;(iii) variation of open-circuit voltage as a function of the thickness of the CZTS layer has been determined. There has been no reported study on a-Si/CZTS configuration-based solar cell, analysis of the parameters, and study to address the challenges that imped efficiency of the photovoltaic device and the same has been discussed in this work. The value of the SnO2/a-Si/CZTS solar cells obtained from the simulation is 23.9%. © 2022, Allerton Press, Inc.

关键词： Zinc compounds

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A Portable 3D-Printed Dielectric Lens Antennas for Liquid-Mixture Characterization

A Portable 3D-Printed Dielectric Lens Antennas for Liquid-Mi...

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2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023

作者： Sangpet, Patchadaporn Thaiwirot, Wanwisa Chudpooti, Sukanya Akkaraekthalin, Prayoot Somjit, Nutapong Chudpooti, Nonchanutt Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand School of Electronic and Electrical Engineering University of Leeds Leeds United Kingdom

ISBN: (纸本)9798350341140

The Fused Deposition Modeling (FDM) method is utilized in this research to present dielectric lens antennas that were 3D printed. The ultra-wideband (UWB) stub antenna's antenna characteristic is intended to be improved by the 3D-printed dielectric lens antennas. The proportion of ethanol in the liquid mixture sample is categorized using the transmission-line measuring technique. The device-under-test (DUT) is placed between two 3D-printed dielectric lens antennas. The glass bottle is filled with a 100-ml liquid sample and covered with a plastic cap. The 3D EM Simulation CST Studio is used to optimize the 10 mm gap between the dielectric lens antennas and the DUT. Six concentrations of the ethanol/water mixture, such as empty, 60%, 65%, 70%, and 80%, are measured to examine the measurement system. The measurement outcomes indicate the various S21 (transmission coefficient) levels between 9 GHz and 11 GHz. According to the trend of the suggested system, the level of the transmission coefficient, S21, will change downward when the proportion of ethanol is increased. Several better advantages, such as a nondestructive method, non-contact measurement, and support with a real-time monitoring system, are provided by the transmission-line measuring methodology using 3D-printed dielectric lens antennas. © 2023 IEEE.

关键词： 3D-printed dielectric lens antennas Fused Deposition Modeling technique non-destructive measurement real-time monitoring system

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Exploring 3D Reconstruction with Drone Images: Advances and Challenges in Urban Environments 50

Exploring 3D Reconstruction with Drone Images: Advances and ...

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50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Miranda Baldivieso, Thiago João da Silva Batista, Taise Grazielle Chagas, Fabio Suim Rodrigues Velho, Luiz Carlos Pacheco Ferreira Rosa, Paulo Fernando Defense Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil State Institute of the Environment Inea RJ Rio de Janeiro Brazil Department of Science and Industry systems University of South-Eastern Norway Kongsberg Norway Department of Computer Graphics Institute for Pure and Applied Mathematics Rio de Janeiro Brazil Electrical Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil

ISBN: (纸本)9781665464543

This working-in-progress paper aims to present a three-dimensional reconstruction using aerial images in different environments. The experiments were conducted with aircraft in both external and internal settings, starting with image acquisition, followed by the application of specific photogrammetry software-both commercial and open-source-and concluding with a qualitative evaluation of the results. © 2024 IEEE.

关键词： Aerial photography

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Vectorial liquid‑crystal holography

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eLight 2024年第1期4卷 251-261页

作者： Ze‑Yu Wang Zhou Zhou Han Zhang Yang Wei Hong‑Guan Yu Wei Hu Wei Chen Hai‑Tao Dai Ling‑Ling Ma Cheng‑Wei Qiu Yan‑Qing Lu National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210023China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China

Vectorial optics with fine inhomogeneous polarization control are highly *** have been captivated a promising candidate,but their static post-fabrication geometry largely limits the dynamic *** crystal(LC)is usually employed as an additional index-changing layer together with ***,most of the reported LCs only impart a varying but uniform phase on top of that from the metasurface,which we term“scalar”LC ***,we pixelate a single-layer LC to display versatile and tunable vectorial holography,in which the polarization and amplitude could be arbitrarily and independently controlled at varying spatial ***,the subtle and vectorial LC-holography highlights the broadband and electrically-switchable *** vectorial LC holography reveals significant opportunities for advanced cryptography,super-resolution imaging,and many other applications.

关键词： Liquid crystals Vectorial optics Holography

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Non-Destructive Ethanol-Aqueous Solution with Modified Jerusalem Resonator for Disinfectants Against COVID-19 Characterization

Non-Destructive Ethanol-Aqueous Solution with Modified Jerus...

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2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023

作者： Sangpet, Patchadaporn Akkaraekthalin, Prayoot Pechrkool, Tanaporn Chudpooti, Sukanya Chudpooti, Nonchanutt King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Industrial Physics and Medical Instrumentation Bangkok Thailand

ISBN: (纸本)9798350341140

This paper describes a liquid-mixture sensor based on a mushroom-shaped zeroth-order resonator (ZOR). The Jerusalem-shaped mushroom-like structure is designed to reduce the dimensions of a resonator and provide a high Q-factor with an operating frequency of 5.90 GHz. Using perturbation theory, every dielectric property of the liquid-mixture influences the resonance frequency. The structure of the sensor is composed of the modified Jerusalem resonator and 3D-printed case for locking the liquid under test (LUT) to reduce the problematic error from position measurement. Five Ethanol-aqueous concentrations, e.g., 60%, 65%, 70%, 75% and 80%, are chosen to investigate the responsibility of the modified Jerusalem resonator. By detecting the change in resonant frequency of the reflection coefficient, S11, the measured results can classify five conditions of the LUT. Other benefits of the zeroth-order resonator sensor include a nondestructive method, real-time monitoring, and no life-cycle limitation. © 2023 IEEE.

关键词： Ethanol-aqueous solution Jerusalem resonator microwave sensor non-destructive method Zeroth-order resonator

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Impact of In flux on self-assembled InGaN/GaN superlattice grown on GaN template by plasma-assisted molecular beam epitaxy

Impact of In flux on self-assembled InGaN/GaN superlattice g...

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2022 Compound Semiconductor Week, CSW 2022

作者： Khan, Kamruzzaman Sun, Kai Wurm, Christian Ahmadi, Elaheh University of Michigan Department of Materials Science and Engineering Ann ArborMI United States University of California Department of Electrical and Computer Engineering Santa BarbaraCA United States University of Michigan Department of Electrical Engineering and Computer Science Ann ArborMI United States University of Michigan Applied Physics Program Ann ArborMI United States

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

We have previously reported spontanous formation of InGaN/GaN superlattice structure on nominal InGaN films grown by plasma-assisted molecular beam epitaxy (PAMBE). In this work, we report on the impact of In flux on the formation and periodicity of self-assembled InxGa1-xN/InyGa1-yN superlattice structure (SASL). We show that the thickness and In composition in the InGaN layer varies by changing the In flux. These films were stucturally characterized by X-ray diffraction and simulated by globalfit software to get the thickness and In composition. The superlattice structures were confimred by scanning transmission electron microscopy and the thickness of InGaN layer and In composition were determined by energy dispersive X-ray spectroscopy. This work can provide a method for using the SASL with better control for their optoelectronics application. © 2022 IEEE.

关键词： III-V semiconductors

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Modeling Atomistically Assembled Diffractive Optics in Solids

arXiv

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arXiv 2024年

作者： Kling, Trevor Na, Dong-Yeop Hosseini, Mahdi Department of Electrical and Computer Engineering Applied Physics Program Northwestern University EvanstonIL60208 United States Department of Electrical Engineering Pohang University of Science and Technology Pohang37673 Korea Republic of Elmore Family School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States

We develop a model describing long-range atom-atom interactions in a two-dimensional periodic or a-periodic lattice of optical centers inside a solid-state host material. We consider realistic environmental and technical conditions such as frequency and position broadening. Even when considering a significant frequency broadening in the ensemble (∼300 GHz), we observe up to a three-fold increase in directional scattering from the resonant lattice in a system. The model can be used to scalably design quantum optical elements, e.g. a quantum lens, harnessing atomistic engineering (e.g. via ion implantation) of collective interactions in materials to enhance quantum properties. © 2024, CC BY.

关键词： Nanocrystals

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Exploring Performance Metrics and Scalability Challenges in a Three-Tiered Multi-Granular 10 Pb/s SDM/UWB Optical Node

Exploring Performance Metrics and Scalability Challenges in ...

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International Conference on Optical Network Design and Modeling, ONDM

作者： Charalampos Papapavlou Konstantinos Paximadis Dan Marom Ioannis Tomkos Department of Electrical and Computer Engineering University of Patras Patras Greece Institute of Applied Physics Hebrew University of Jerusalem Jerusalem Israel

ISBN: (数字)9783903176676

ISBN: (纸本)9798331501501

We investigate the scaling potential and compute critical performance metrics of a three-tiered hierarchical optical node architecture. The optical node incorporates novel Photonic Integrated Circuit (PIC)-based WaveBand Selective Switches (WBSSs) to implement flexibly-defined band switching, across spatial lanes and degrees of connectivity, ranging from entire optical fibers, flexible-defined bands to individual wavelengths. We also develop a network simulator considering node's multiple switching layers, multiple/portion of bands and all key optical transmission parameters. Simulations reveal high optical Signal to Noise Ratio (OSNR) and low Bit Error Rate (BER) values, particularly for the Full Fiber Switching (FFS) scenario. Moreover, we analyze trade-offs among scalability, component number and complexity, and throughput across various configurations and traffic scenarios. Our results confirm high levels architecture adaptability and efficiency in addressing the evolving demands of future optical networks.

关键词： Optical fibers Optical switches Scalability Bit error rate computer architecture Throughput Adaptive optics Optical noise Integrated circuit modeling Signal to noise ratio

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Femtosecond Filament Coupled with Structured Light for Free Space Optical Communication

Femtosecond Filament Coupled with Structured Light for Free ...

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CLEO: Science and Innovations, S and I 2022

作者： Reza, Saad Bin Ali Wang, Tianhong Buldt, Finn Bassène, Pascal N'Gom, Moussa Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY United States Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute TroyNY United States

We created a 4-bit communication channel for free-space optical communication (FSO) through a segmented space division multiplexing method using structured light coupled with a femtosecond-laser induced filament. ... 详细信息

ISBN: (纸本)9781557528209

关键词： Optical communication

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