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Dynamic targets searching assistance based on virtual camera priority

Virtual Reality & Intelligent Hardware 2021年第6期3卷 484-500页

作者： Zixiang ZHAO Quanwei ZHOU Xiaoguang HAN Lili WANG State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China Department of Mathematics and Theories Peng Cheng LaboratoryShenzhen 518052China The Chinese University of Hong Kong Shenzhen 999077China Shenzhen Research Institute of Big Data Shenzhen 999077China

Background When a user walks freely in an unknown virtual scene and searches for multiple dynamic targets,the lack of a comprehensive understanding of the environment may have a negative impact on the execution of virtual reality *** studies can help users with auxiliary tools,such as top view maps or trails,and exploration guidance,for example,automatically generated paths according to the user location and important static spots in virtual ***,in some virtual reality applications,when the scene has complex occlusions,and the user cannot obtain any real-time position information of the dynamic target,the above assistance cannot help the user complete the task more *** We design a virtual camera priority-based assistance to help the user search dynamic targets *** of forcing users to go to destinations,we provide an optimized instant path to guide them to places where they are more likely to find dynamic targets when they ask for *** assume that a certain number of virtual cameras are fixed in virtual scenes to obtain extra depth maps,which capture the depth information of the scene and the locations of the dynamic *** method automatically analyzes the priority of these virtual cameras,chooses the destination,and generates an instant path to assist the user in finding the dynamic *** method is suitable for various virtual reality applications that do not require manual supervision or *** A user study is designed to evaluate the proposed *** results indicate that compared with three conventional navigation methods,such as the top-view method,our method can help users find dynamic targets more *** advantages include reducing the task completion time,reducing the number of resets,increasing the average distance between resets,and reducing user task *** We presented a method for improving dynamic target searching efficiency in virtual scenes by virtual cam

关键词： Searching assistance Virtual environment Path guidance Redirection

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Correction to: Scalable fabrication of wide-bandgap perovskites using green solvents for tandem solar cells (Nature Energy, (2024), 10.1038/s41560-024-01672-x)

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Nature Energy 2025年

作者： Duan, Chenyang Gao, Han Xiao, Ke Yeddu, Vishal Wang, Bo Lin, Renxing Sun, Hongfei Wu, Pu Ahmed, Yameen Bui, Anh Dinh Zheng, Xuntian Wang, Yurui Wen, Jin Wang, Yinke Ou, Wennan Liu, Chenshuaiyu Zhang, Yuhong Nguyen, Hieu Luo, Haowen Li, Ludong Liu, Ye Luo, Xin Saidaminov, Makhsud I. Tan, Hairen National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Frontiers Science Center for Critical Earth Material Cycling Nanjing University Nanjing China Co. Ltd Suzhou China Department of Chemistry University of Victoria VictoriaBC Canada Research School of Electrical Energy and Materials Engineering College of Engineering and Computer Science The Australian National University CanberraNSW Australia

Correction to: Nature Energyhttps://***/10.1038/s41560-024-01672-x, published online 15 November 2024. In the version of the article initially published, we mistakenly listed the environmental score for DMSO as 4 instead of the correct score of 5, based on the evaluation criteria outlined by CHEM21. This error, along with the transposition of the "NMP" and "DMPU" labels on the x axis, has been corrected in Fig. 1a, as seen below in Fig. 1. (Figure presented.) Original and corrected Fig. 1a. To ensure clarity and accuracy, we have revised our understanding of the combination rules for determining risk levels. Previously, our explanation might have been unclear or misleading to readers. To address this, we have included an excerpt from the CHEM21 solvent guide below, which provides a clear list of solvent risk levels and their ranking rules (Tables 1 and 2). (Table presented.) (Table presented.) CHEM21 solvent guide of "classical" solvents1 Ranking by default1 These two tables clearly illustrate the risk levels and comprehensive evaluation criteria for the solvents discussed in our article. To enhance reader understanding, we have also integrated this information into the corrected Fig. 1a, providing a visual representation of the risk levels associated with different solvents. Additionally, we have made two necessary revisions to the second paragraph of the article. The sentence "To address this challenge, the evaluation criteria outlined by CHEM21 offer a guide, categorizing solvents into four groups based on their impact on safety, health and environment10, namely recommended (no chemical incompatibility under process conditions), problematic (suitable for lab or kilo-scale lab use), hazardous (strong constraints on scale-up) and highly hazardous (solvents to be avoided even in the lab)" has been corrected to "To address this challenge, the evaluation criteria outlined by CHEM21 offer a guide, comprehensively categorizing solvents into three groups based on the

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The Future of Smart Grids: Revolutionizing Energy Distribution with advanced IoT, and Renewable Integration

The Future of Smart Grids: Revolutionizing Energy Distributi...

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Global Conference for Advancement in Technology (GCAT)

作者： S. Avinash J.C. Vinitha S. Sree Dharinya V. Samuthira Pandi Lakshmi Priya J Jaishika S Department of MBA St. Joseph's College of Engineering Chennai Department of Electrical and Electronics Engineering Rajalakshmi Engineering College Chennai Tamil Nadu India School of Computer Science Engineering and Information Systems VIT University Vellore Centre for Advanced Wireless Integrated Technology Chennai Institute of Technology Chennai Tamil Nadu India Department of ECE Saveetha Engineering College Chennai Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Chennai

ISBN: (数字)9798350376685

ISBN: (纸本)9798350376692

Smart grids, which integrate modern Internet of Things (IoT) technology and renewable energy sources to boost efficiency, sustainability, and dependability, are poised to bring about a dramatic shift in the future of energy distribution. Intelligent grids are expected to bring about this shift. Focusing on the role of the Internet of Things (IoT) in enabling real-time monitoring and control, as well as the incorporation of renewable energy to support a low-carbon future, this research investigates the potential for smart grids to change the energy sector. This study gives insights into how smart grids can be efficiently deployed to satisfy the growing energy needs of society by studying the technological breakthroughs, obstacles, and benefits of smart grids. Specifically, the study's focus is on smart grids. The research highlights the essential role that smart grids play in aiding the shift towards a more sustainable and resilient energy infrastructure by conducting an in-depth analysis of case studies, pilot projects, and industry trends all around the world. Providing recommendations for policymakers, industry stakeholders, and utilities to exploit the full potential of smart grids in determining the future of energy distribution, the findings contribute to the continuing discourse on the strategic development and implementation of smart grid technologies. Both of these topics are currently being discussed.

关键词： Industries Renewable energy sources Protocols Real-time systems Smart grids Internet of Things Stakeholders Standards Resilience Investment

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Joint Waveform and Passive Beamforming Design for IRS-Aided ISAC via Deep Unfolding

Joint Waveform and Passive Beamforming Design for IRS-Aided ...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Jifa Zhang Mingqian Liu Jie Tang Nan Zhao Dusit Niyato Xianbin Wang School of Information and Communication Engineering Dalian University of Technology Dalian P. R. China State Key Laboratory of Integrated Service Networks Xidian University Xi'an P. R. China School of Electronic and Information Engineering South China University of Technology Guangzhou P. R. China School of Computer Science and Engineering Nanyang Technological University Singapore Department of Electrical and Computer Engineering Western University London Canada

ISBN: (数字)9798350390643

ISBN: (纸本)9798350390650

Integrated sensing and communication (ISAC) has become a promising technique to alleviate the spectrum congestion via sharing the same spectrum for communication and sensing. Nevertheless, many ISAC schemes encounter the challenges of high complexity. In this paper, we propose a dual-functional waveform design scheme for reconfigurable intelligent surface (RIS) aided ISAC based on deep unfolding learning. Specifically, the weighted sum of multi-user interference energy and waveform discrepancy is minimized via the joint waveform and phase-shift design. We first develop an alternating direction method of multipliers (ADMM) based iterative algorithm to handle the non-convex optimization problem. Then, we develop a deep unfolding neural network (NN), named ADMM-NET, which unfolds the proposed ADMM-based iterative algorithm to a layer-wise architecture. Simulation results verify the effectiveness of the proposed ADMM-NET.

关键词： Wireless communication Simulation Artificial neural networks Interference Reconfigurable intelligent surfaces Integrated sensing and communication Convex functions Complexity theory Iterative methods Optimization

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On Enhancing WiGig Communications With A UAV-Mounted RIS System: A Contextual Multi-Armed Bandit Approach

On Enhancing WiGig Communications With A UAV-Mounted RIS Sys...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Sherief Hashima Ehab Mahmoud Mohamed Kohei Hatano Eiji Takimoto Mostafa M. Fouda Zubair Md Fadlullah Computational Learning Theory Team Riken-AIP Fukuoka Japan College of Engineering Prince Sattam Bin Abdulaziz University Wadi Aldwaser Saudi Arabia Department of Informatics Kyushu University Fukuoka Japan Department of Electrical and Computer Engineering Idaho State University Pocatello ID USA Center for Advanced Energy Studies (CAES) Idaho Falls ID USA Department of Computer Science Western University London ON Canada

Recently emerging WiGig systems experience limited coverage and signal strength fluctuations due to strict line-of-sight (LoS) connectivity requirements. In this paper, we address these shortcomings of WiGig communication by exploiting two emerging technologies in tandem, namely the reconfigurable intelligent surface (RIS) and unmanned aerial vehicles (UAVs). In ultra-dense traffic sites (referred to as hotspots) where WiGig nodes or User Devices (UDs) experience complex propagation and non-line-of-sight (non-LoS) environment, we envision the deployment of a UAV-mounted RIS system to complement the WiGig base station (WGBS) to deliver services to the UDs. However, commercially available UAVs have limited energy (i.e., constrained flight time). Therefore, the trajectory of our considered UAV needs to be locally estimated to enable it to serve multiple hotspots while minimizing its energy consumption within the WGBS coverage boundaries. Since this tradeoff problem is computationally expensive for the resource-constrained UAV, we argue that sequential learning can be a lightweight yet effective solution to locally solve the problem with a low impact on the available energy on the UAV. We formally formulate this problem as a contextual multi-armed bandit (CMAB) game. Then, we develop the linear randomized upper confidence bound (Lin-RUCB) algorithm to solve the problem effectively. We regard the UAV as the bandit learner, which attempts to maximize its attainable rate (i.e., the reward) by serving distinct hotspots in its trajectory that we treat as the arms of the considered bandit. The context is defined as the hotspots’ locations provided using GPS (global positioning system) service and the reward history of each hotspot. Our proposal accounts for the energy expenditure of the UAV in moving from one hotspot to another within its battery charge lifetime. We evaluate the performance of our proposal via extensive simulations that exhibit the superiority of our proposed

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Low-SAR Design Methods for Terminal Antenna

Low-SAR Design Methods for Terminal Antenna

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Longxiao Yang Wei Hu Long Qian Lehu Wen Bao Lu Wen Jiang National Key Laboratory of Radar Detection and Sensing Xidian University Xian China School of Electronic Engineering and Computer Science Queen Mary University of London London UK Department of Electronic and Electrical Engineering Brunel University London London UK Guangdong OPPO Mobile Telecommunications Corporation Ltd Dongguan China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

To reduce the effects of electromagnetic radiation from terminal antennas on human health, low specific absorption rate (SAR) design methods are proposed in this work. Utilized the mode-current control on the loop structure and metal ground, the antenna element achieves a SAR reduction of more than 65.4% while maintaining good radiation performance. In addition, a low-SAR $\mathbf{4} \times \mathbf{4}$ multiple-input multiple-output (MIMO) array is developed by placing the presented antenna elements with an optimized layout.

关键词： Antenna theory Absorption Design methodology Layout Metals Electromagnetic radiation Specific absorption rate MIMO communication Antenna arrays

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Mimicking synaptic plasticity with wedged Pt/Co/Pt spin-orbit torque device

arXiv

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arXiv 2024年

作者： Chen, Shiwei Mishra, Rahul Chen, Huanjian Yang, Hyunsoo Qiu, Xuepeng Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai200092 China Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Centre for Applied Research in Electronics Indian Institute of Technology Delhi New Delhi110016 India

We fabricated a wedge shape of Pt/Co/Pt device with perpendicular magnetic anisotropy and manifested that the Co magnetization can be solely switched by spin-orbit torque without any magnetic field. Similar to the synaptic weight, we observed that the state of Co magnetization (presented by the anomalous Hall resistance RH) of wedged Pt/Co/Pt device can be tuned continuously with a large number of nonvolatile levels by applied pulse currents. Furthermore, we have studied the synaptic plasticity of wedged Pt/Co/Pt device, including the excitatory postsynaptic potentials (EPSP) or inhibitory postsynaptic potentials (IPSP) and spiking-time-dependent plasticity (STDP). The work elucidates the promise of wedged Pt/Co/Pt device as a candidate for new type of artificial synaptic devices induced by spin current and paving a substantial pathway towards the combination of spintronics and synaptic devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetic anisotropy

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Data Identification Optimal Control for Quantized Linear Systems under DoS Attacks

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IEEE Transactions on Aerospace and Electronic Systems 2025年

作者： Wang, Xianming Li, Liwei Shen, Mouquan Zhao, Xudong Wang, Qing-Guo Zhu, Zheng Hong Nanjing Tech University School of Mechanical and Power Engineering Nanjing211816 China Nanjing Tech University College of Electrical Engineering and Control Science Nanjing211816 China Dalian University of Technology Faculty of Electronic Information and Electrical Engineering Dalian116024 China Beijing Normal University Institute of Ai and Future Networks Zhuhai519087 China BNU-HKBU United International College Guangdong Provincial Key Laboratory Irads Department of Computer Science Zhuhai519087 China York University Department of Mechanical Engineering TorontoONM3J 1P3 Canada

This paper is devoted to data identification optimal control for quantized linear systems under denial of service (DoS) attacks. A least-squares algorithm is provided to identify the unknown system matrices using a data-based representation. An output estimation algorithm utilizing identified matrices is supplied to offset DoS attacks. Consequently, an optimal controller is built on the quantized and attacked data by adaptive dynamic programming. Sufficient conditions are presented to guarantee that the resultant closed-loop system is ultimately uniformly bounded. An example is produced to verify the validity of the proposed approach. © 1965-2011 IEEE.

关键词： Optimal control systems

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Learning Reduced-Order Linear Parameter-Varying Models of Nonlinear Systems

arXiv

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arXiv 2023年

作者： Koelewijn, Patrick J.W. Singh, Rajiv Seiler, Peter Tóth, Roland Sioux Technologies B.V. Eindhoven Netherlands Control Systems Group Eindhoven University of Technology Eindhoven Netherlands The MathWorks Inc. Natick United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor United States Systems and Control Laboratory HUN-REN Institute for Computer Science and Control Budapest Hungary

In this paper, we consider the learning of a Reduced-Order Linear Parameter-Varying Model (ROLPVM) of a nonlinear dynamical system based on data. This is achieved by a two-step procedure. In the first step, we learn a projection to a lower dimensional state-space. In step two, an LPV model is learned on the reduced-order state-space using a novel, efficient parameterization in terms of neural networks. The improved modeling accuracy of the method compared to an existing method is demonstrated by simulation examples. Copyright © 2023, The Authors. All rights reserved.

关键词： Nonlinear dynamical systems

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Acoustic Sensing for Fitness Activities Recognition: A Deep Learning Approach

Acoustic Sensing for Fitness Activities Recognition: A Deep ...

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IEEE Conference on computer Communications Workshops, INFOCOM Wksps

作者： Chen Dai Weihao Zhou Linqing Gui Haotong Cao Sahil Garg Fu Xiao School of Computer Science Nanjing University of Posts and Telecommunications China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks China College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications China Electrical Engineering Department École de technologie supérieure Montréal Canada

ISBN: (数字)9798350384475

ISBN: (纸本)9798350384482

Currently, the demand for home fitness has increased as more people choose to work remotely. Acoustic sensing technology has gained popularity due to its practicality on fitness activity monitoring. Due to the fact that sound waves do not propagate uniformly in all directions, identifying fitness activities can be challenging when sound waves do not directly face the device. To address it, we propose a method that models the reflected signal based on the sound field characteristics of a piston sound source and introduces a novel signal processing technique to reduce angle correlation. Then we combine deep learning methods for fitness activity recognition. Experimental results demonstrate improved recognition accuracy for fitness activities performed at different angles around the device.

关键词： Pistons Deep learning Performance evaluation Correlation Accuracy Activity recognition Signal processing

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