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arXiv 2022年

作者： Sharma, Nelson Ghosh, Aswini Misra, Rajiv Mukhopadhyay, Supratik Sharma, Gokarna Department of Computer Science and Engineering Indian Institute of Technology Patna India Department of Environmental Sciences Louisiana State University Baton RougeLA United States Department of Computer Science Kent State University KentOH United States

We present a deep reinforcement learning-based framework for automatically discovering patterns available in any given initial configuration of fat robot swarms. In particular, we model the problem of collision-less gathering and mutual visibility in fat robot swarms and discover patterns for solving them using our framework. We show that by shaping reward signals based on certain constraints like mutual visibility and safe proximity, the robots can discover collision-less trajectories leading to "well-formed" gathering and visibility patterns. © 2022, CC BY.

关键词： Reinforcement learning

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Collective Polaritonic Effects on Chemical Dynamics Suppressed by Disorder

arXiv

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arXiv 2023年

作者： Pérez-Sánchez, Juan B. Mellini, Federico Giebink, Noel C. Yuen-Zhou, Joel Department of Chemistry and Biochemistry University of California San Diego La Jolla CA92093 United States Department of Electrical Engineering and Computer Science and Physics University of Michigan Ann ArborMI48109 United States

We present a powerful formalism, disordered collective dynamics using truncated equations (d-CUT-E), to simulate the ultrafast quantum dynamics of molecular polaritons in the collective strong coupling regime, where a disordered ensemble of N 106 molecules couples to a cavity mode. Notably, we can capture this dynamics with a cavity hosting a single effective molecule with ∼ Nbins electronic states, where Nbins N is the number of bins discretizing the disorder distribution. Using d-CUT-E we conclude that strong coupling, as evaluated from linear optical spectra, can be a poor proxy for polariton chemistry. For highly disordered ensembles, total reaction yield upon broadband excitation is identical to that outside of the cavity, while narrowband excitation produces distinct reaction yields solely due to differences in the initial states prepared prior to the reaction. Copyright © 2023, The Authors. All rights reserved.

关键词： Molecules

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When do molecular polaritons behave like optical filters?

arXiv

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arXiv 2024年

作者： Schwennicke, Kai Koner, Arghadip Pérez-Sánchez, Juan B. Xiong, Wei Giebink, Noel C. Weichman, Marissa L. Yuen-Zhou, Joel Department of Chemistry and Biochemistry University of California San Diego La Jolla CA92093 United States Department of Electrical Engineering and Computer Science and Physics University of Michigan Ann ArborMI48109 United States Department of Chemistry Princeton University PrincetonNJ08544 United States

This perspective outlines several linear optical effects featured by molecular polaritons arising in the collective strong light-matter coupling regime, focusing on the limit when the number of molecules per photon mode is large. We show that, under these circumstances, molecular absorption within a cavity can be understood as the overlap between the polariton transmission and bare molecular absorption spectra, suggesting that polaritons act in part as optical filters. This framework demystifies and provides a straightforward explanation for a large class of theoretical models of polaritonic phenomena, highlighting that similar effects might be achievable outside a cavity with shaped laser pulses. With a few modifications, this simple conceptual picture can also be adapted to understand the incoherent nonlinear response of polaritonic systems. However, we note that there are experimental observations in the collective regime that exhibit phenomena that go beyond this treatment. Our analysis underscores the importance of the notion that the field still needs to establish a clear distinction between polaritonic phenomena that can be fully explained through classical optics and those that require a more advanced theoretical framework. The linear optics approach presented here is exact when the number of molecules tends to infinity and is quite accurate for a large, but finite, number of molecules. We highlight the limitations of this treatment when the rates of the single-molecule processes that facilitate dark-stateto- polariton relaxation cannot be neglected and in systems under strong coupling with few molecules. Further exploration in these areas is needed to uncover novel polaritonic phenomena. © 2024, CC BY.

关键词： Phonons

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Topological Edge States at Singular Points in Non-Hermitian Plasmonic Waveguide-Cavity Systems

Topological Edge States at Singular Points in Non-Hermitian ...

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CLEO: science and Innovations, S and I 2022

作者： Huang, Yin Shen, Yuecheng Veronis, Georgios Department of Optoelectrics Information Science and Engineering School of Physics and Electronics Central South University Hunan Changsha410012 China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-Sen University Guangdong Guangzhou510275 China School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States

We show that non-Hermitian plasmonic waveguide-cavity systems can simultaneously exhibit both topological edge states and singular points. We also show that the sensitivity of the reflected light intensity is greatly ... 详细信息

ISBN: (纸本)9781557528209

关键词： Topology

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Potential Benefits of Increased Public Transit Ridership in Medium Sized Cities: A Case Study

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Journal of Transportation Technologies 2022年第1期12卷 59-79页

作者： Taniya Sultana Virginia P. Sisiopiku Jalal Khalil Da Yan Department of Civil & Environmental Engineering Louisiana State University Baton Rouge LA USA Department of Civil Construction and Environmental Engineering University of Alabama at Birmingham Birmingham AL USA Department of Computer Science University of Alabama at Birmingham Birmingham AL USA

At the beginning of the twentieth century, the United States was leading in the public transit sector, but following World War II, private automobiles became more affordable and gained popularity. Transportation infrastructure investments that increased road capacity further facilitated the increase in automobile use at the expense of reduced public transit ridership. With the increase of dependency on automobiles and the continuing growth of private automobile ownership and use, various problems became major challenges in big cities of USA. These include traffic congestion, air pollution, road and parking infrastructure costs, energy consumption, traffic safety, fewer mobility options for the non-drivers, and a decline in the image and use of public transit. This study uses a medium sized city, Birmingham as a case study to investigate the potential of public transit to reduce automobile trips and in turn improve the overall performance of the road network by addressing the abovementioned challenges. An agent-based simulation model was developed for the Birmingham metropolitan region using the Multi-agent Transport Simulation (MATSim) platform. Three scenarios were considered with gradually increased transit ridership to identify the benefits of increased public transit. Traffic volume, network average speed, and travel times were used as performance measures for the evaluation of the designated scenarios. Results suggest that modal shifts toward public transit and reduction in travel demand for an automobile can result in improvements in speed and travel time for all users. Therefore, investments for improving transit quality and frequency of service, as well as campaigns to improve the image of public transit and make it a mode of choice for transportation users can increase transit ridership and, in turn, improve network operations, thus are deemed worthy for medium sized cities.

关键词： Public Transit Ridership Modal Shift Transportation Network Operations MATSim

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New Efficient Optimal Fir Equalizer Design

SSRN

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SSRN 2023年

作者： Wu, Hsiao-Chun Chang, Shih-Yu Department of Electrical and Computer Engineering Louisiana State University Baton RougeLA70803 United States Department of Applied Data Science San Jose State University San JoseCA95192 United States

Finite impulse response (FIR) filters are commonly used as linear equalizers in vehicular communication systems due to their advantages including linear-phase property, stability, and implementation efficiency. As the perfect equalizer is actually the inverse of a channel filter, it would inevitably possess a mixing-phase transfer function very often. However, there hardly exists any systematic approach governing how to design an FIR equalizer by the optimal approximation of the perfect equalizer subject to a target signal-to-interference ratio (SIR). Therefore, in this correspondence, we make the first-ever attempt to formulate a new optimization problem for designing an FIR equalizer to determine the minimum FIR-equalizer length subject to a target (maximum allowable) SIR. We propose a novel algorithm to solve this optimization problem. The conventional approach is to apply the least-squares (LS) method to determine the optimal FIR coefficients given an FIR-equalizer length;then the SIRs resulting from various equalizer lengths will be compared to determine the minimum among them in compliance with the target SIR. In other words, the conventional FIR-equalizer design approach is simply based on the exhaustive trial-and-error analysis. In this work, we propose a novel efficient FIR-equalizer design algorithm, which can determine the minimum equalizer length subject to a maximum allowable SIR in a fast manner. The advantage of our proposed new © 2023, The Authors. All rights reserved.

关键词： Equalizers

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Design and Optimization of Mobile Car Ranging Based on Single Chip Microcomputer

Design and Optimization of Mobile Car Ranging Based on Singl...

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IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems

作者： Fangzheng Wu Qiang Wu lanying Xu Peng Zhao Guolin Pan Department of Computer Science Tulane University New Orleans LA United States School of Automobile and Transportation Engineering Guangdong Polytechnic Normal University Guangzhou China College of Electromechanical Engineering Guangdong Polytechnic Normal University Guangzhou China

With the development of society and economy, the number of cars on the road has exploded and caused a series of traffic problems. Only relying on the rear-view mirror has been unable to meet the safety requirements of drivers on the rear collision of cars. Based on the analysis of ultrasonic sensors and STC89C52 microcontroller, the advantages and disadvantages of various ranging principles and factors affecting the accuracy of ultrasonic ranging are studied, and the temperature compensation method is added to improve. The LCD display screen is used to display the distance between the car and the obstacle and the current temperature, and when the distance between the two is less than 5cm, a buzzer is sent to prompt. The ranging system has the advantages of simple structure, low cost, high accuracy, LCD display real-time display of changing distance, and a driving motor to make the car move, to meet the requirements of mobile ranging.

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Effect of temperature oscillations on kinetic inductance and depairing in thin and narrow superconducting nanowire resonators

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Physical Review B 2023年第10期107卷 104520-104520页

作者： Jason P. Allmaras Alexander G. Kozorezov Marco Colangelo Boris A. Korzh Matthew D. Shaw Karl K. Berggren Jet Propulsion Laboratory California Institute of Technology Pasadena California 91109 USA Department of Physics Lancaster University Lancaster LA1 4YB United Kingdom Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02138 USA

Recent experiments have demonstrated a method for extracting the depairing current of nanowires fabricated from thin-film dirty superconductors using the AC response of DC-current biased resonators. While the existing theoretical model for understanding this response, developed by Clem and Kogan, provides agreement with Eilenberger-Usadel theory at low temperatures, there is a systematic and substantial deviation from theory at elevated temperatures. We propose that the DC bias in the presence of electromagnetic oscillations leads to Joule heating in the superconductor. This heating, combined with the strong electron-electron scattering in these heavily disordered materials, leads to oscillations in the effective temperature of the superconductor which alter the kinetic inductance. In this work, we derive the expression for the shift in kinetic inductance in the presence of a bias current and demonstrate that this model provides a significantly improved agreement between experiment and theory.

关键词： Nanowires Superconducting devices Type-II superconductors

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Quantum Computing Society of the Philippines: An NGO Perspective on Promoting Quantum Information, science, and Technology in the Philippines

Quantum Computing Society of the Philippines: An NGO Perspec...

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Quantum Computing and engineering (QCE), IEEE International Conference on

作者： Dylan Josh Domingo Lopez Elmer Peramo Jabez Mendoza Ayson Angela Nicole S. Masongsong lance Dominic C. Raquel Bobby O. Corpus Department of Computer Technology De La Salle University Manila Philippines Department of Science and Technology Advanced Science and Technology Institute Quezon City Philippines Electronics Engineering Department Don Honorio Ventura State University Pampanga Philippines STEM Department De La Salle University Integrated School Manila Philippines Department of Physics University of San Carlos Cebu City Philippines Quantum Computing Society of the Philippines Manila Philippines

ISBN: (数字)9798331541378

ISBN: (纸本)9798331541385

The development of Quantum Information science and Technology (QIST) as an emerging technology among developed and developing countries has caught the attention of governments, industries, and educational institutions. However, not all countries have equal starting points in promoting QIST amongst different sectors. Several players in various countries promote QIST as a discipline and education. Although significant developments in quantum technology are focused in Western countries, great innovation can also be seen in Eastern countries, specifically Asia. The Philippines is one of several developing countries in Asia that is in the process of adopting QIST in multiple sectors. In this paper, the Quantum Computing Society of the Philippines (QCSP) is introduced as one of the arms of the country for promoting QIST to the public. Further in this paper, the initial impact of QIST promotion on various communities across the Philippines through multiple activities and educational efforts is explained. Several critical success stories for different audiences were described, wherein initial acceptance of QIST was evident through hackathons and lecture series. Events held show improvement in interest and proficiency in the foundations of QIST.

关键词： Industries Technological innovation Quantum computing Program processors Asia Government Education Developing countries Quantum information science Hackathon

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Comprehensive analysis on Ultralytics-supported YOLO models for detection and recognition of large office objects for indoor navigation

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Procedia computer science 2024年 246卷 3851-3858页

作者： Renann G. Baldovino Aron Jake P. Vidad Rudwin Paul B. Abastillas Nilo T. Bugtai Elmer P. Dadios Ryan Rhay P. Vicerra Argel A. Bandala Aaron Raymond See Nicanor R. Roxas Institute of Biomedical Engineering and Health Technologies (IBEHT) Department of Manufacturing Engineering and Management (DMEM) Department of Electronics and Computer Engineering (DECE) De La Salle University (DLSU) 2401 Taft Avenue 0922 Manila Philippines Department of Electrical Engineering Southern Taiwan University of Science and Technology (STUST) No. 1號 Nantai St Yongkang District Tainan City 71005 Taiwan Department of Electronic Engineering National Chin-Yi University of Technology No. 57 Section 2 Zhongshan Rd Taiping District Taichung City 411030 Taiwan

The state of object detection has quickly progressed due to the rapid development of hardware and deep learning models for the said task. The continuous development of the latter allowed its application in real-time. That is, from two-stage to one-stage detectors, which greatly reduced the processing time; and from anchor-based to anchor-free detectors, which allowed a more efficient and flexible model implementation. The purpose of this study is to explore the various YOLO versions available in Ultralytics to detect large office objects for obstacle avoidance. More specifically, this study observed how the versions, 3u, 5mu, 8 and 6m, from which the first three are anchor-free, perform over the dataset. Based from the results, it was found that there were no significant differences between the detectors, except for the anchor-based v6m, which has the worst scores. The four models, v8n, v8s, v8m, and v5mu, were, however, chosen as the candidate models due to their processing speed, ranging from 66 to 75 FPS on the NVIDIA GeForce RTX 3060 GPU. The said models were also subjected to an optimization process in terms of the confidence and IoU threshold values to find the pair that could provide the best metric scores. Results have provided candidate models for the study’s detection task for obstacle avoidance in real-time.

关键词： deep learning indoor navigation object recognition YOLO

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