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WcAMDG: Wireless Charging and Assisted Mobile Data Gathering Algorithm in WRSNs 14th

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WcAMDG: Wireless Charging and Assisted Mobile Data Gatherin...

14th China Conference on Wireless Sensor Networks, CWSN 2020

作者： Lyu, Zengwei Wei, Zhenchun Wang, Xinchen Lu, Yang Xu, Guowei School of Computer Science and Information Engineering Hefei University of Technology Hefei China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of Education Hefei China

ISBN: (纸本)9789813342132

In Wireless Sensor Networks, sensor nodes near the base station need to forward data generated by the other nodes, which causes the early death of these sensor nodes. To solve the problem, some researchers used mobile sink to collect data from sensor nodes to save energy, some researchers employed mobile wireless charger to replenish energy for sensor nodes. In this paper, a Mobile Equipment (ME) with wireless charging and data collecting function is employed due to the different frequencies of data transmission and energy transfer, therefore it can save energy and replenish energy for the network simultaneously. An energy-saving coefficient is designed to balance the multi-hop transmission and the data collecting by the ME in each sensor node. Based on Lagrange Dual Decomposition and Sub-gradient Optimization methods, a distributed on-demand charging planning algorithm with assisted data collecting is proposed to optimize the charging energy in each sensor node and the routing of the WSNs. Experiments show that our proposed algorithm can effectively prolong the lifespan of network, balance the energy consumption of sensor nodes, and improve the energy utilization of the ME. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Sensor nodes

Design of the Wiener Gain in Noisy and Reverberant Environments

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SSRN 2024年

作者： Xiang, Qian Chen, Jingdong Benesty, Jacob Lei, Tao Pan, Chao School of Electrical and Control Engineering Shaanxi University of Science and Technology Shaanxi Xi’an710021 China Center of Intelligent Acoustics and Immersive Communications Northwestern Polytechnical University Shaanxi Xi’an710072 China INRS-EMT University of Quebec MontrealQCH5A 1K6 Canada School of Electronic Information and Artificial Intelligence Shaanxi University of Science and Technology Shaanxi Xi’an710021 China

The Wiener gain or filter plays an important role in both single-channel and multichannel speech enhancement. Traditional Wiener gain formulations are typically based solely on either the signal-to-noise ratio (SNR) or the coherent-to-diffuse ratio (CDR), rendering them suboptimal in noisy and reverberant environments. In this paper, we present an approach to the design of the Wiener gain by incorporating estimates of both SNR and CDR. Additionally, we introduce two hyperparameters to govern the extent of noise reduction and reverberation suppression. Through simulations, we demonstrate that the proposed approach surpasses widely used methods in terms of SNR gain, log-spectral-distortion (LSD), direct-to-reverberant energy ratio (DRR), and Kurtosis ratio (KR). © 2024, The Authors. All rights reserved.

关键词： Signal to noise ratio

Segmentation Model Approaches using Cardiac Magnetic Resonance Images: A Review

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TechRxiv

TechRxiv 2022年

作者： Khan, Amjad Nfai, Dayang Wang, Yin Chai Lim, P.C. Ullah, Faheem Javid Ahmad, Tariq Deapartment of Computing Abasyn University Islamabad Campus Pakistan UNIMAS Sarawak Malaysia School of Automation and Control Engineering SCUT China Department of Computer Science University of Science and Technology Bannu Pakistan School of Information and Communications Engineering Guilin University China

Automatic segmentation solution is the process of detecting and extracting information to simplify the representation of Cardiac Magnetic Resonance images (CMRI) of Left Ventricle (LV) contour. This segmented information, using CMR images, helps to reduce the segmentation error between expert and automatic segmented contours. The error represents missing region values calculated in percentages after segmenting a cardiac LV contour. This review paper will discuss the major three segmentation approaches, namely manual approach, semiautomatic, and fully automatic, along with the segmentation models, namely image-based models, region-based models, edge-based models, deformable-based models, active shape-based models (ASM), active contour-based models (ACM), level set-based models (LSM), and variational LSM (VLSM). The review deeply explains the performance of segmentation models using different techniques. Furthermore, the review compares 122 studies on segmentation model approaches, i.e., 16 from 2004 to 2010, 40 from 2011 to 2016, and 63 from 2017 to 2021, and 3 other related studies were conducted for LV contour segmentation, cardiac function, area-at-risk (AAR) identification, scar tissue classification, oedema tissue classification, and identification via presence, size, and location. Given the large number of articles on CMR-LV images that have been published, this review conducted a critical analysis and found a gap for researchers in the areas of LV localization, LV contour segmentation, cardiac function, and oedoema tissue classification and segmentation. Regarding critical analysis, this paper summarised a research gap and made useful suggestions for new CMR-LV researchers. although a timely reviewed study can lead to cardiac segmentation challenges, which will be discussed in each review section. © 2022, CC BY.

关键词： Magnetic resonance imaging

Multi-target High-speed Positioning System Based on Triple UWB Radio Frequency 6

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Multi-target High-speed Positioning System Based on Triple U...

6th IEEE International Conference on Computer and communications, ICCC 2020

作者： Li, Qingqiao Lu, Yang School of Computer Science and Information Engineering Hefei University of Technology Hefei China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of Education Hefei China

ISBN: (纸本)9781728186351

When the single radio frequency (single-RF) Ultra-Wideband (UWB) wireless positioning system composed of DW1000 faces multi-target positioning, because each tag is located in sequence, the positioning period is usually long, and it cannot well meet the needs of multi-target high-speed positioning. This paper proposes to extend three DW1000 modules on the basis of a single-RF anchor to form a triple radio frequency (triple-RF) anchor. Each DW1000 module on the triple-RF anchor can perform ranging with a single-RF mobile tag with the same channel, respectively. When the three DW1000 modules on the triple-RF anchor use different channels, they can work in parallel and locate three tags at the same time. The Time of Arrival (TOA) and Time Difference of Arrival (TDOA) positioning algorithms are respectively applied to triple-RF anchor, the experimental results show that the number of positioning in the triple-RF anchor using the TOA and TDOA algorithms in the same time reaches 2.41 and 2.66 times that of single-RF anchor respectively, which can effectively improve the positioning speed in multi-target scenarios. © 2020 IEEE.

关键词： Time difference of arrival

Optical meta-waveguides for integrated photonics and beyond

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Light(Science & Applications) 2021年第12期10卷 2263-2306页

作者： Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong Qirong Xiao Shulin Sun Minming Zhang Xiaocong Yuan Xingjie Ni State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information Science and TechnologyFudan UniversityShanghai 200433China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electrical Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA Optoelearonic Division Department of EngineeringUniversity of Sannio1-82100 BeneventoItaly Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua University100084 BeijingChina Yiwu Research Institute of Fudan University Chengbei RoadYiwu City 322000 ZhejiangChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 HubeiChina

The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic *** integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic ***,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical *** results and representative applications are comprehensively *** physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as *** highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel *** further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond.

关键词： waveguides waveguide beyond

Secure Communication of Active RIS Assisted NOMA Networks

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arXiv

arXiv 2024年

作者： Li, Xuehua Pei, Yingjie Yue, Xinwei Liu, Yuanwei Ding, Zhiguo The Key Laboratory of Information and Communication Systems Ministry of Information Industry The Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100101 China The School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China The School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom Department of Electrical Engineering and Computer Science Khalifa University Abu Dhabi United Arab Emirates

As a revolutionary technology, reconfigurable intelligent surface (RIS) has been deemed as an indispensable part of the 6th generation communications due to its inherent ability to regulate the wireless channels. However, passive RIS (PRIS) still suffers from some pressing issues, one of which is that the fading of the entire reflection link is proportional to the product of the distances from the base station to the PRIS and from the PRIS to the users, i.e., the productive attenuation. To tackle this problem, active RIS (ARIS) has been proposed to reconfigure the wireless propagation condition and alleviate the productive attenuation. In this paper, we investigate the physical layer security of the ARIS assisted non-orthogonal multiple access (NOMA) networks with the attendance of external and internal eavesdroppers. To be specific, the closed-form expressions of secrecy outage probability (SOP) and secrecy system throughput are derived by invoking both imperfect successive interference cancellation (ipSIC) and perfect SIC. The secrecy diversity orders of legitimate users are obtained at high signal-to-noise ratios. Numerical results are presented to verify the accuracy of the theoretical expressions and indicate that: i) The SOP of ARIS assisted NOMA networks exceeds that of PRIS-NOMA, ARIS/PRIS-assisted orthogonal multiple access (OMA);ii) Due to the balance between the thermal noise and residual interference, introducing excess reconfigurable elements at ARIS is not helpful to reduce the SOP;and iii) The secrecy throughput performance of ARIS-NOMA networks outperforms that of PRIS-NOMA and ARIS/PRIS-OMA networks. Copyright © 2024, The Authors. All rights reserved.

关键词： Signal to noise ratio

Synthesis of Ultra-Low Freezing Point Alkane by Self-Aldol Condensation of N-Butyraldehyde Over Mgo-Sio2 Catalyst

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SSRN 2023年

作者： Jiang, Zhenjing Wang, Wuyu Zhang, Xinghua Zhang, Qi Ma, Longlong School of Energy Science and Engineering University of Science and Technology of China Hefei230026 China Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou510640 China Key Laboratory of Energy Thermal Conversion and Process Measurement and Control Ministry of Education School of Energy and Environment Southeast University Nanjing210096 China

Production of aviation fuel is promising but challenging in the field of biomass utilization. Here we proposed a novel route to produce highly branched alkanes with ultra-low freezing point using n-butyraldehyde as feedstocks by self-aldol condensation and subsequent hydrodeoxygenation (HDO). The catalytic activities of silica supported magnesium oxide catalysts (MgO-SiO2) were carefully explored in the self-aldol condensation of n-butyraldehyde using n-butanol as the solvent. It was found that synergetic effect between basic site and weak Bronsted acid site played a key role in the self-aldol condensation of n-butyraldehyde. The yields of condensation product C8 and C12 oxygenate were 69.3% and 26.8% respectively. The regeneration ability of preferred 30% MgO-SiO2 catalyst exhibited an excellent reusability in the self-aldol condensation of n-butyraldehyde. In addition, hydrodeoxygenation of condensation products was also conducted over 5 wt% Pd/C and HZSM-5 catalysts. The obtained HDO products were highly branched alkanes with ultra-low freezing point. © 2023, The Authors. All rights reserved.

关键词： Silica

Optimization and Verification of Thermal Management System for Pure Electric Vehicle Based on Multi Task Model

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SSRN 2023年

作者： Zhang, Chunfeng Wan, Yilong Yang, Yanhong Lin, Qiao Xihua University Chengdu610039 China Vehicle Measurement Control and Safety Key Laboratory of Sichuan Province Chengdu610039 China Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology of Sichuan Chengdu610039 China Sichuan Industrial School of Intelligent and New Energy Automobile Chengdu610039 China

There are many subsystems that require thermal management for pure electric vehicles, and their thermal impact mechanism is complex. Establishing a multi task model and comprehensively optimizing the parameters and architecture of the vehicle thermal management system is of great significance for reducing energy consumption and increasing driving range of pure electric vehicles. Taking the opportunity to participate in the development of a pure electric vehicle in a certain company, Firstly, this article constructs a vehicle dynamics model and a component model of the vehicle thermal management system based on the actual vehicle parameters, vehicle dynamics theory, and bench test data. Using the national standard CLTC-P cycle working condition as the testing standard, the accuracy of the model is verified, and a control strategy for the thermal management system is designed to complete the dynamic model construction of the vehicle thermal management system;Secondly, based on GB/T 18386.1-2021, the energy flow and temperature data were analyzed and compared to verify that the constructed model has high accuracy in terms of energy consumption performance of the entire vehicle under low temperature conditions and temperature control of key components;Finally, the energy consumption problem of PTC heating the battery pack is optimized and simulated using the ambient temperature threshold strategy, as well as the thermal management architecture. The results show that under this strategy, the driving range of the entire vehicle has been improved in low-temperature economic tests;The optimized thermal management architecture is more energy-efficient. © 2023, The Authors. All rights reserved.

关键词： Temperature control

Optimization and Verification of Thermal Management System for Pure Electric Vehicle Based on Multi Task Model

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SSRN 2023年

关键词： Temperature control