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arXiv 2023年

作者： Geng, Meng Wu, Youxi Li, Yan Liu, Jing Fournier-Viger, Philippe Zhu, Xingquan Wu, Xindong School of Artificial Intelligence Hebei University of Technology Tianjin300401 China School of Economics and Management Hebei University of Technology Tianjin300401 China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300401 China Shenzhen University Shenzhen China Department of Computer & Electrical Engineering and Computer Science Florida Atlantic University FL33431 United States Research Center for Knowledge Engineering The Zhejiang Lab Hangzhou311121 China

Sequential pattern mining (SPM) is an important branch of knowledge discovery that aims to mine frequent sub-sequences (patterns) in a sequential database. Various SPM methods have been investigated, and most of them are classical SPM methods, since these methods only consider whether or not a given pattern occurs within a sequence. Classical SPM can only find the common features of sequences, but it ignores the number of occurrences of the pattern in each sequence, i.e., the degree of interest of specific users. To solve this problem, this paper addresses the issue of repetitive nonoverlapping sequential pattern (RNP) mining and proposes the RNP-Miner algorithm. To reduce the number of candidate patterns, RNP-Miner adopts an itemset pattern join strategy. To improve the efficiency of support calculation, RNP-Miner utilizes the candidate support calculation algorithm based on the position dictionary. To validate the performance of RNP-Miner, 10 competitive algorithms and 20 sequence databases were selected. The experimental results verify that RNP-Miner outperforms the other algorithms, and using RNPs can achieve a better clustering performance than raw data and classical frequent patterns. All the algorithms were developed using the PyCharm environment and can be downloaded from https://***/wuc567/Pattern-Mining/tree/master/RNPMiner. Copyright © 2023, The Authors. All rights reserved.

关键词： Clustering algorithms

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Reconfigurable Virtual Accelerator (ReVA) for Large-Scale Acceleration Circuits 30th

Reconfigurable Virtual Accelerator (ReVA) for Large-Scale A...

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30th International Conference on Parallel and Distributed Processing Techniques, PDPTA 2024, held as part of the World Congress in computer science, computer engineering and Applied Computing, CSCE 2024

作者： Yaguchi, Kazuki Maeda, Eriko Kawai, Shunya Teruya, Daichi Osana, Yasunori Miyoshi, Takefumi Nakajo, Hironori Department of Electrical Engineering and Computer Science Graduate School of Engineering Tokyo University of Agriculture and Technology 2-24-16 Nakacho Tokyo Koganei-shi184-8588 Japan Research and Education Institute for Semiconductors and Informatics Kumamoto University 2-39-1 Kurokami Kumamoto Chuo-ku860-8555 Japan WasaLabo LLC. K-2 Buransyu 6-5-20 Minaminaruse Tokyo Machida-shi194-0045 Japan Division of Advanced Information Technology and Computer Science Institute of Engineering Tokyo University of Agriculture and Technology 2-24-16 Nakacho Tokyo Koganei-shi184-8588 Japan

ISBN: (纸本)9783031856372

In recent years, hardware acceleration in large-scale computing fields such as Artificial Intelligence and High Performance Computing, faces hardware resource shortages. To overcome this problem, we propose Reconfigurable Virtual Accelerator (ReVA), which allows a large-scale acceleration circuit built using multiple FPGAs, processors and memory subsystems, to accelerate application programs. We have designed and implemented a prototype of Virtual Accelerator (VA) Generator for ReVA to investigate its performance. The VA Generator prototype employs an open-source HLS automated split compilation tool, RapidStream, to automatically generate placed-and-routed virtual accelerators that can be implemented on multiple FPGAs based on HLS dataflow designs. The VA Generator, which places VAs on the appropriate regions of FPGAs, allows large circuits to be performed like a single accelerator using several FPGAs. In addition, RapidStream’s parallel compilation technology allows the VA Generator to suppress the increasing compilation time according to the circuit size. Moreover, with our VA Generator prototype we have built and evaluated a VA of a large-scale circuit which cannot be fit in a single FPGA with multiple FPGAs. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Reconfigurable hardware

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Directivity Improvement of MIMO Array Antenna using Novel Eight Element Array Configuration

Directivity Improvement of MIMO Array Antenna using Novel Ei...

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Advancement in Electronics & Communication engineering (AECE), International Conference on

作者： Alaa M. Lafta Abdul Razzaq T. Zaboun Shakhlokhon Kosimova Alaa. Shather Hawraa Ali Sabah Haider Alchilibi National University of Science and Technology Dhi Qar Iraq Forensic sciences department Al-Esraa University College Baghdad Iraq Department of Architecture Fergana Polytechnic Institute Fergana Uzbekistan Department of Computer Engineering Technology Al Kitab University Altun Kopru Kirkuk Iraq Medical Laboratory Techniques Department Al-Farahidi University Baghdad Iraq

In this study, the Directivity of the Microstrip Patch MIMO Antenna is a Novel Eight element array configuration in comparison with its performance of a Single element patch antenna. Directivity improvement and Return loss measured for different frequencies and values are compared with a Single element patch antenna. Novel Eight element MIMO array antenna is designed and compared with a Single patch element antenna. In this work, there are two groups (Eight element patch & Single element patch) each consisting of 20 samples with pre-test power or G-power of 80%. The mean Return loss in the Novel eight element MIMO array antenna is -18.39 dB and in the Single element antenna is -15.21 dB. These results showed that the Novel eight element array exhibited a better Directivity improvement (4.483 dB) than the single element antenna (2.261 dB) with the two-tailed significance of (p < 0.05). The Directivity improvement is significantly better for a Novel eight element array antenna when compared with a single element patch antenna.

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Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs

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Light(science & Applications) 2021年第10期10卷 1840-1848页

作者： Peng Mao Changxu Liu Xiyan Li Mengxia Liu Qiang Chen Min Han Stefan A.Maier Edward H.Sargent Shuang Zhang School of Physics and Astronomy University of BirminghamB152TT BirminghamUK National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Centre of Advanced MicrostructuresNanjing UniversityNanjing 210093China Chair in Hybrid Nanosystems Nanoinstitute MunichFaculty of PhysicsLudwigMaximilians-Universitaet Muenchen80539 MuenchenGermany Department of Electrical and Computer Engineering University of Toronto35 St.George StreetTorontoON M5S 1A4Canada Key Laboratory of Intelligent Optical Sensing and Manipulation(Nanjing University) Ministry of EducationNanjingChina Department of Physics Imperial College LondonLondon SW72AZUK Department of Physics University of Hong KongHong Kong 999077China Department of Electrical and Electronic Engineering University of Hong KongHong Kong 999077China

While total internal reflection(TIR)lays the foundation for many important applications,foremost fibre optics that revolutionised information technologies,it is undesirable in some other applications such as light-emitting diodes(LEDs),which are a backbone for energy-efficient light *** the case of LEDs,TIR prevents photons from escaping the constituent high-index *** in material science have led to good efficiencies in generating photons from electron–hole pairs,making light extraction the bottleneck of the overall efficiency of *** recent years,the extraction efficiency has been improved,using nanostructures at the semiconductor/air interface that outcouple trapped photons to the outside ***,the design of geometrical features for light extraction with sizes comparable to or smaller than the optical wavelength always requires sophisticated and timeconsuming fabrication,which causes a gap between lab demonstration and industrial-level *** by lightning bugs,we propose and realise a disordered metasurface for light extraction throughout the visible spectrum,achieved with single-step *** applying such a cost-effective light extraction layer,we improve the external quantum efficiency by a factor of 1.65 for commercialised GaN LEDs,demonstrating a substantial potential for global energy-saving and sustainability.

关键词： light backbone consuming

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Radiation pressure on bi-grating and axicon diffractive beam-riding light sails 18

Radiation pressure on bi-grating and axicon diffractive beam...

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Optical Trapping and Optical Micromanipulation XVIII 2021

作者： Chu, Ying-Ju L. Srivastava, Prateek R. Meem, Monjurul Menon, Rajesh Tabiryan, Nelson Swartzlander, Grover A. Chester F. Carlson Center for Imaging Science Rochester Institute of Technology RochesterNY14623 United States Department of Electrical and Computer Engineering University of Utah Salt Lake CityUT84112 United States BEAM Engineering for Advanced Measurements Winter ParkFL32810 United States

ISBN: (数字)9781510644359

ISBN: (纸本)9781510644342

Experimental measurements related to the opto-mechanical stability of thin film diffractive beam-riders are discussed. Our theoretical predictions of radiation pressure forces indicate that these structures allow a perturbed laser-driven light sail to remain in the beam path. Radiation pressure forces of both a liquid crystal polymer bi-grating and an etched photoresist axicon diffraction grating will be described. Our experiments made use of a vacuum torsion oscillator having sub-nano-Newton sensitivity. The parametric damping of both systems will also be described. Our measurements validate the technical feasibility of a laser-driven light sail based on diffractive thin films. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Diffraction gratings

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Bandgap Dependence of Near-Conduction Band State in (AgyCu1-y)(InxGa1-x)Se2Solar Cells 49

Bandgap Dependence of Near-Conduction Band State in (AgyCu1-...

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49th IEEE Photovoltaics Specialists Conference, PVSC 2022

作者： Miller, Michael F. Bothwell, Alexandra M. Valdes, Nicholas Paetel, Stefan Farshchi, Rouin Kanevce, Ana Shafarman, William Kuciauskas, Darius Arehart, Aaron R. The Ohio State University Department of Electrical & Computer Engineering ColumbusOH43210 United States National Renewable Energy Laboratory GoldenCO80401 United States University of Delaware Department of Materials Science & Engineering NewarkDE19716 United States First Solar Inc. Santa ClaraCA95050 United States Stuttgart70563 Germany MiaSolé Hi-Tech Corp. Santa ClaraCA95051 United States

ISBN: (纸本)9781728161174

(Ag, CU) ( mathbf{In}, mathbf{Ga}) mathbf{Se}-{ boldsymbol{2}}-based solar cells have achieved high collection efficiencies, but defects still limit efficiencies well below the theoretical limit. The near-conduction band defect, typically observed at mathbf{E}-{ mathbf{V}} boldsymbol{+0.98} eV, has been ubiquitous across ( mathbf{Ag}, mathbf{Cu}) ( mathbf{In}, mathbf{Ga}) mathbf{Se}-{ boldsymbol{2}} samples from multiple vendors. The current work explores a wider range of composition and demonstrates the trap energy varies relative to the valence band but is approximately constant relative to the conduction band (Ec-0.13 eV). There is also no definitive dependence of the trap concentration on composition. © 2022 IEEE.

关键词： Defects

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Computational Review on Cognitive Analysis for Epilepsy Detection Using ML and DL Applications

Computational Review on Cognitive Analysis for Epilepsy Dete...

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IEEE International Conference on Emerging & Sustainable Technologies for Power & ICT in a Developing Society (NIGERCON)

作者： R. Kishore Kanna K. Yamuna Devi Archibald Danquah-Amoah S. Purnima Ayodeji Olalekan Salau Sudharani B Banappagoudar Department of Biomedical Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Chennai India Department of Biomedical Engineering SRM Easwari Engineering College Chennai India Medical Laboratory Technology and Biomedical Engineering Accra Technical University Ghana West Africa Department of Biomedical Engineering Jerusalem College of Engineering Chennai India Department of Electrical/ Electronics and Computer Engineering Afe Babalola University Ado-Ekiti Nigeria Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai Tamil Nadu India School of Nursing Science ITM University Gwalior MP India

ISBN: (数字)9798331542559

ISBN: (纸本)9798331542566

Individuals with epilepsy face many challenges due to the recurrent epilepsy of this complex neurological disorder. Symptoms of this epilepsy include panic behaviour, strange feelings and, in severe cases, delusions. These seizures manifest as abnormal electrical discharges in the central nervous system. Effective stroke care relies on early detection and diagnosis of stroke, enabling timely interventions to reduce risks and enhance patient outcomes We can say that there has been a remarkable breakthrough in epilepsy research in recent years is mainly due to two factors: the lack of rapidly developing machine learning EGs and the availability of inexpensive EEGs have facilitated the collection of brain activity of information, and to provide opportunities to monitor and evaluate seizure events outside of traditional medical settings Study programs have the ability to analyze EEG data and diagnose seizures, and thus patients with epilepsy no ability with enhanced control and educated decision making This review presents a current overview of existing approaches to the treatment of multiple sclerosis. Feature extraction methods and classification algorithms receive important considerations. Details of commonly used EEG data types and their availability are provided. Tested methods include a range of techniques, including well-performing learning systems are been employed to provide efficient results.

关键词： Support vector machines Machine learning algorithms Sensitivity Reviews System performance Epilepsy Stroke (medical condition) Electroencephalography Timing Prognostics and health management

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A Distributed control framework for the optimal operation of DC microgrids

A Distributed control framework for the optimal operation of...

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IEEE Conference on Decision and Control

作者： Zao Fu Michele Cucuzzella Carlo Cenedese Wenwu Yu Jacquelien M. A. Scherpen School of Cyber Science and Engineering Southeast University Nanjing China Faculty of Science and Engineering University of Groningen Groningen the Netherlands Department of Electrical Computer and Biomedical Engineering University of Pavia Pavia Italy Automatic Control Laboratory ETH Zürich Zürich Switzerland

ISBN: (数字)9781665467612

ISBN: (纸本)9781665467629

In this paper we propose an original distributed control framework for DC microgrids. We first formulate the (optimal) control objectives as an aggregative game suitable for the energy trading market. Then, based on duality, we analyze the equivalent distributed optimal condition for the proposed aggregative game and design a distributed control scheme to solve it. By interconnecting the DC microgrid and the designed distributed control system in a power preserving way, we steer the DC microgrid’s state to the desired optimal equilibrium, satisfying a predefined set of local and coupling constraints. Finally, based on singular perturbation system theory, we analyze the convergence of the closed-loop system. The simulation results show excellent performance of the proposed control framework.

关键词： Simulation Perturbation methods Decentralized control Optimal control Microgrids Games Power markets

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Coulomb-corrected quantum-trajectories method for recollision-impact double ionization in an intense laser field

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Physical Review A 2023年第1期108卷 013115-013115页

作者： Yuxing Bai Xiaolei Hao Weidong Li Weifeng Yang Jing Chen Institute of Theoretical Physics and Department of Physics State Key Laboratory of Quantum Optics and Quantum Optics Devices Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China Department of Computer Science and Technology Taiyuan University Taiyuan 237016 China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technology and College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China Department of Physics School of Science Hainan University Haikou 570228 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China

By incorporating the quantum effects and the Coulomb interaction between the first ionized electron and the residual ion in a uniform theory, the Coulomb-corrected quantum-trajectories (CCQT) method is developed to describe the recollision-impact ionization (RII) process in nonsequential double ionization of atoms in intense laser field. The results simulated by CCQT are found to be in better agreement with the experimental results, compared with those calculated by the classical-trajectory Monte Carlo (CTMC) and strong-field approximation (SFA) methods. Considering its advantage of small computational cost and back-trajectory analysis, the CCQT method will be an efficient theoretical tool to quantitatively investigate the underlying physics of the complex and coherent multielectron dynamics in intense laser field.

关键词： Atomic & molecular processes in external fields Electronic excitation & ionization Strong field excitation Atomic systems Electronic structure High-harmonic generation Optical techniques Quantum Monte Carlo Semiclassical methods

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Aperiodic Devices as a Platform for Nano- and Quantum Photonics

Aperiodic Devices as a Platform for Nano- and Quantum Photon...

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Laser science, LS 2022

作者： Trojak, Oliver J. Gorsky, Sean Sgrignuoli, Fabrizio Pinheiro, Felipe A. Song, Jin Dong Negro, Luca Dal Sapienza, Luca Advanced Research Centre University of Glasgow GlasgowG11 6EW United Kingdom Department of Electrical and Computer Engineering Photonics Center Boston University MA02215 United States Instituto de Fisica Universidade Federal do Rio de Janeiro RJ Rio de Janeiro21941-972 Brazil Korea Institute of Science and Technology Seoul136-791 Korea Republic of

We show that aperiodic photonic devices in silicon nitride and gallium arsenide allow high quality light confinement at visible wavelengths (Q factors up to 2200) and cavity quantum electrodynamic experiments with InA... 详细信息

ISBN: (纸本)9781557528209

关键词： III-V semiconductors

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