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2023 China Automation Congress, CAC 2023

作者： Cao, Zhexiao Fu, Yao Wang, Tian Liu, Deyuan Wang, Jian Snoussi, Hichem Institute of Artificial Intelligence Beihang University Beijing China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China Institute of Artificial Intelligence Sklsde Beihang University Zhongguancun Laboratory Beijing China School of Automation Science and Electrical Engineering Beihang University Beijing China School of Computer Science Wuhan University Wuhan China University of Technology of Troyes Laboratory of Computer Science and Digital Society Troyes France

ISBN: (纸本)9798350303759

The objective of video anomaly detection is to distinguish events within videos that deviate from expected normal behavior. An effective anomaly detection model requires strong spatio-temporal feature extraction capabilities to capture both appearance and motion information from the video. We utilize a generative adversarial networks model to perform anomaly detection by predicting future frame. The model is trained with multi-objective loss function for appearance and motion constraints. We introduce multi-objective optimization algorithm to guarantee the convergence of training objectives, including intensity loss, gradient loss for appearance constraints, optical flow loss for motion constraints and adversarial loss for adversarial training. By ensuring corresponding generative outcome for both normal events to confirm to expectation and anomaly events not to do so, we obtain an anomaly detection model with satisfying experimental result on video anomaly detection datasets, showing the success of the proposed training strategy. © 2023 IEEE.

关键词： Multiobjective optimization

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STAR-RIS-Assisted Covert Wireless Communications With Randomly Distributed Blockages

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IEEE Transactions on Wireless Communications 2025年第6期24卷 4690-4705页

作者： Li, Xingwang Zhao, Jingwei Chen, Gaojie Hao, Wanming Costa, Daniel Benevides da Nallanathan, Arumugam Shin, Hyundong Yuen, Chau Henan Polytechnic University School of Physics and Electronic Information Engineering Jiaozuo454099 China Southeast University National Mobile Communications Research Laboratory Nanjing210096 China Guangdong Shenzhen518107 China University of Surrey 5GIC 6GIC Centre GuildfordGU2 7XH United Kingdom Zhengzhou University School of Electrical and Information Engineering Zhengzhou450001 China King Fahd University of Petroleum and Minerals Interdisciplinary Research Center for Communication Systems and Sensing Department of Electrical Engineering Dhahran31261 Saudi Arabia Queen Mary University of London School of Electronic Engineering and Computer Science LondonE1 4NS United Kingdom Kyung Hee University Department of Electronic Engineering Gyeonggi-do Yongin-si17104 Korea Republic of Kyung Hee University Department of Electronics and Information Convergence Engineering Gyeonggido Yongin-si17104 Korea Republic of Nanyang Technological University School of Electrical and Electronics Engineering Jurong West 639798 Singapore

As one of the promising technologies, reconfigurable intelligent surface (RIS) and simultaneous transmitting and reflecting RIS (STAR-RIS) have attracted great interest. However, the existing RISs offer broadband tuning capability without filtering function due to the absence of radio frequency (RF) units, which easily leads to the unexpected tuning of the RIS undesired signals, especially in large-scale deployments. For the target network, it is difficult to obtain the parameter settings of RISs to serve other networks, which causes the unpredictability of the wireless environment. In this paper, we consider the covert communication in a STAR-RIS assisted random wireless network with randomly distributed blockages. We investigate the impact of STAR-RIS large-scale deployment on covert communication and leverage its inherent unpredictability for improving the covertness. We derive the average detection error probability for warden within the random wireless networks. Furthermore, we optimize the passive beamforming of STAR-RIS to maximize the covert communication rate, considering both direct and indirect line-of-sight (LoS) links. To address this, we employ an alternating optimization (AO) algorithm based on the semi-definite programming (SDP) method. Finally, numerical results demonstrate significant enhancements and increase covert capability achieved through the large-scale deployment of STAR RIS. © 2002-2012 IEEE.

关键词： Numerical methods

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Implementation of ML Algorithm for Mung Bean Classification using Smart Phone

Implementation of ML Algorithm for Mung Bean Classification ...

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2022 International Conference on Business Analytics for Technology and Security, ICBATS 2022

作者： Shahid, Muhammad Munir, Kashif Muneer, Salman Mutiullah Jarrah, Muath Farooq, Umer Govt. Se College Department of Physics Bahawalpur Pakistan Khawaja Fareed University of Engineering and Information Technology Department of Computer Engineering Rahim Yar Khan Pakistan Ncbae School of Computer Science Lahore Pakistan Khawaja Fareed University of Engineering and Information Technology Faculty of Computer Science and Information Technology Rahim Yar Khan Pakistan Skyline University College University City Sharjah School of Information Technology Sharjah1797 United Arab Emirates Lahore Garrison University School of Computer Science Lahore Pakistan

ISBN: (纸本)9781665409209

This work is an extension of my work presented a robust and economically efficient method for the discrimination of four Mung-Beans varieties based on quantitative parameters, Due to the advancement of technology day by day users try to find the solutions to their daily life problems using smartphones but still there is limited resources are available in smartphone concerning computing power and memory so there is need to find the best classifier which can classify the Mung-Beans using already suggested features in previous work with minimum memory requirements and computational power. For achieving the goal of this study, we take the experiments on various supervised classifiers which have simple architecture and calculations and give the robust performance on the most relevant 10 suggested features are selected by Fisher Co-efficient, Probability of Error, Mutual Information, and wavelet features. After the analysis, we replace the Artificial Neural Network and Deep learning with such a classifier which gives approximately the same classification results as the above classifier but is efficient in terms of resources and time complexity. This classifier is easily implemented in the smartphone environment. © 2022 IEEE.

关键词： Smartphones

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Photon pairs in 3R-stacked MoS2

Photon pairs in 3R-stacked MoS2

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

作者： Weissflog, Maximilian A. Fedotova, Anna Tang, Yilin Laudert, Benjamin Abtahi, Fatemeh Shradha, Sai Shinde, Saniya Saravi, Sina Staude, Isabelle Pertsch, Thomas Lu, Yuerui Setzpfandt, Frank Eilenberger, Falk Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Jena07745 Germany Institute of Solid State Physics Friedrich Schiller University Jena Jena07743 Germany School of Engineering College of Science and Computer Science The Australian National University CanberraACT2601 Australia Institute for Condensed Matter Physics Technical University of Darmstadt Darmstadt64289 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena07745 Germany

We demonstrate photon-pair generation through spontaneous parametric downconversion in transition metal dichalcogenides, namely 3R-MoS2. By exciting 278nm thick 3R-MoS2 stacks at 788nm, we produce entangled photon-pai... 详细信息

ISBN: (纸本)9781957171296

关键词： Crystal orientation Diode lasers Femtosecond lasers Parametric down conversion Second harmonic generation Ultrafast lasers

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Mutual Coupling Reduction of Dual-band MIMO Antenna Array Using Near-Perfect Metamaterial Absorber Wall

Mutual Coupling Reduction of Dual-band MIMO Antenna Array Us...

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2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio science Meeting, AP-S/URSI 2022

作者： Deng, Shasha Zhang, Xiang Chen, Chang Ding, Jun Zhang, Hualiang Chen, Weidong University of Science and Technology of China School of Information Science and Technology Hefei230031 China East China Normal University School of Physics and Electronic Science Shanghai200241 China University of Massachusetts Department of Electrical and Computer Engineering LowellMA01854 United States

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

A dual-band near-perfect metamaterial absorber (MA) is proposed in this paper to realize mutual coupling reductions for a multiple-input-multiple-output antenna array at two independent bands. The double-layer MA exhibits dual-band near 100% absorptions at the operating frequencies of the antenna array (3.5 and 5.2 GHz), of which the two antenna elements are closely spaced with an edge-to-edge distance of 12 mm. After inserting an isolation wall composed of four MA unit cells between the two antennas, the spatial coupling waves can be absorbed to realize a sharp drop in the mutual coupling at the operating frequencies. To validate the decoupling mechanism, an antenna array prototype with the isolation wall is fabricated and measured. The measured results show good agreement with the simulated ones. Moreover, a considerable mutual coupling reduction of 25 dB at the lower band and 26 dB at the upper band can be achieved. © 2022 IEEE.

关键词： Antenna arrays

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Efficient Route Analysis and Content Delivery in IoT-Fog Networks with ETLO 7

Efficient Route Analysis and Content Delivery in IoT-Fog Net...

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7th International Conference on Image Information Processing, ICIIP 2023

作者： Radhika, M. Jayavadivel, R. Prabhu, M. Ramkumar Kumar, Vijay Pardey, Minal A. Anil Kumar, N. Bharathiyar Institute of Engineering For Women Department of Ece Tamilnadu Salem India Alliance University Alliance College of Engineering And Design Department of Computer Science And Engineering Karnataka Bangalore562106 India Saveetha Institute of Medical And Technical Sciences Saveetha School of Engineering Department of Ece Tamil Nadu Chennai India Graphic Era Hill University Dehradun Department of Physics India Jagadambha College of Engineering & Technology Department of Computer Engineering Maharashtra Yavatmal India Mohan Babu University School of Engineering And Technology Department of Electronics And Communication Engineering Andhra Pradesh Tirupati India

ISBN: (纸本)9798350371406

Efficient content delivery in fog computing networks is crucial for reducing the internet access points and long-distance cloud network traffic. Optimizing route analysis for forwarding content using cache is a difficult task because fog networks are dynamic and the need to minimize computation and source overhead. In this study, we discourse the route research problem in fog computing networks with an optimised technique called Enhanced Teaching Learning Optimisation (ETLO). The ETLO algorithm is made to reflect system conditions as accurately as possible and achieve optimal coverage while minimizing the number of iterations and resource overhead. Through extensive simulations and comparisons with existing Teaching Learning Based Optimization (TLBO) and Simulated Annealing (SA) algorithms, we demonstrate that ETLO outperforms TLBO in terms of memory overhead and network size needed to distribute material to far-off places. Moreover, ETLO exhibits better execution time, memory overhead, and scalability with respect to network size compared to SA. The analysis reveals that the moderation rate plays a critical part in determining the amount of memory and execution time, with an inverse proportional relationship. The average memory usage of ETLO is found to be 0.186% less than TLBO, while TLBO performs slightly better in execution time. Thereby, the proposed ETLO algorithm significantly enhances the efficiency of content delivery in fog computing networks, leading to an optimized and resource-efficient routing process. The findings underscore the potential of ETLO in improving network performance and content caching strategies, thereby contributing to the advancement of fog computing technologies. © 2023 IEEE.

关键词： Fog computing

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Spontaneous Parametric Down-Conversion in Transition Metal Dichalcogenides

Spontaneous Parametric Down-Conversion in Transition Metal D...

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2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Weissflog, Maximilian A. Fedotova, Anna Tang, Yilin Laudert, Benjamin Abtahi, Fatemeh Shradha, Sai Shinde, Saniya Saravi, Sina Staude, Isabelle Pertsch, Thomas Setzpfandt, Frank Lu, Yuerui Eilenberger, Falk Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Jena07745 Germany Institute of Solid State Physics Friedrich Schiller University Jena Jena07743 Germany School of Engineering College of Science and Computer Science The Australian National University CanberraACT2601 Australia Institute for Condensed Matter Physics Technical University of Darmstadt Darmstadt64289 Germany Fraunhofer-Institute for Applied Optics and Precision Engineering IOF Jena07745 Germany

ISBN: (纸本)9798350345995

Transition metal dichalcogenides (TMDCs) thinned-down to the monolayer level allow the realisation of very broad-band, phase-matching free nonlinear devices. A particularly interesting application would be the generation of entangled photon-pairs, which form the backbone of many recent implementations in quantum optics. However, the limited absolute efficiency of monolayers has so far only allowed seeded parametric amplification [1], experimental evidence for the generation of entangled photon-pairs through spontaneous parametric down-conversion (SPDC) remained elusive up to now [2]. A promising route for the realization of broad-band photon-pair sources in van der Waals materials are moderately thicker, yet still phase-matching free layer stacks with preserved noncentrosymmetry [3, 4]. Here, we close the gap of a missing entangled photon-pair source in TMDCs and demonstrate, for the first time to our knowledge, pair generation via SPDC in 3R-MoS2 © 2023 IEEE.

关键词： Transition metals

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Formalising the intentional stance 2: a coinductive approach

arXiv

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arXiv 2025年

作者： McGregor, Simon Timorl Virgo, Nathaniel University of Sussex United Kingdom Centre of Data Innovation Research School of Physics Engineering & Computer Science University of Hertfordshire United Kingdom Earth-Life Science Institute Institute of Science Tokyo Japan

We are concerned with the mathematical foundations of cognition: in particular, given a stochastic process with inputs and output, how might its behaviour be related to the pursuit of a goal? We model this using what we term transducers, which are a mathematical object that captures only the external behaviour of such a system and not its internal state. A companion paper provides an accessible description of our results aimed at cognitive scientists, while the current paper gives formal definitions and proofs of the results. To formalise the concept of a system that behaves as if it were pursuing a goal, we consider what happens when a transducer (a ‘policy’) is coupled to another transducer that comes equipped with a success condition (a ‘teleo-environment’). A (globally) optimal policy is identified with the behaviour of a system that behaves as if it were perfectly rational in the pursuit of a goal;our framework also allows us to model constrained rationality. We find that (globally) optimal policies have a property closely related to Bellman’s principle from dynamic programming: a policy that is optimal in one time step will again be optimal in the next time step, but with respect to a different teleo-environment (obtained from the original one by a modified version of Bayesian filtering). This helps to elucidate the appearance of Bayesian formalisms in models of cognition. We describe a condition that is sufficient for this property to also apply to the bounded-rational case. Additionally, we show that a policy is deterministic if and only if there exists a teleo-environment for which it is uniquely optimal among the set of all policies;this is at least conceptually related to classical representation theorems from decision theory. This need not hold in the bounded-rational case;we give an example of this related to the so-called absent-minded driver problem. All of the formalism is defined using coinduction, following the style proposed by Czajka[6].MSC Codes

关键词： Stochastic systems

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Effects of Base Stations, Access Points, Users, and Power Control on Cellular and Cell-Free Massive Mimo Systems: A Machine Learning Study

SSRN

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SSRN 2023年

作者： Ahmadi, Neda Kourtessis, Pandelis Senior, John Mporas, Iosif Papazafeiropoulos, Anastasios Communications and Intelligent Systems Group School of Physics Engineering and Computer Science University of Hertfordshire Hatfield United Kingdom

In massive multiple-input-multiple-output (mMIMO) systems, the importance of power control (PC) cannot be overstated. The PC is estimated by various algorithms, including the weighted mean square error (WMMSE) algorithm. High computational complexity is demanded by these algorithms to estimate the PC. This paper presents an evaluation of PC in mMIMO systems, focusing on the sum of spectral efficiency (sum SE) and the cumulative distribution function (CDF) subject to SE per user equipment (UE). The effects of varying the number of UEs, access points/base stations (APs/BSs), and deep neural network (DNN)-based PC were investigated in both cellular (CL) and cell-free (CF) architectures. Experimental results demonstrate the impact of 'g', the parameter affecting the input vector of the DNN algorithm, on the DNN minus WMMSE curve. The findings highlight the significance of considering the number of APs/BSs and antennas in achieving optimal PC performance. © 2023, The Authors. All rights reserved.

关键词： Spectrum efficiency

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Tuning Light-Induced Ultrafast Responses of Plasmonic Nanostructures through Structural Design

Tuning Light-Induced Ultrafast Responses of Plasmonic Nanost...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Kim, Andrew S. Taghinejad, Mohammad Goswami, Anjan Cai, Wenshan Research Institute of Basic Science Seoul National University Seoul08826 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Geballe Laboratory for Advanced Materials Stanford University StanfordCA94305 United States School of Electrial and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States

Kerr-type nonlinearity accessed by pulsed lasers enables dynamic tuning of nanophotonic devices in an ultrafast timescale. We discuss how judicious construction of plasmonic nanostructures enable the control of tempor... 详细信息

关键词： Nanophotonics

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