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Advanced Research in Computing (ICARC), International Conference on

作者： Karunaharan Vithusan Samiru Gayan Sampath Edirisinghe Department of Electronic and Telecommunication Engineering University of Moratuwa Sri Lanka Department of Computer Engineering University of Sri Jayawardenepura Sri Jayawardenapura Sri Lanka

ISBN: (数字)9798331530983

ISBN: (纸本)9798331530990

The energy consumption of telecommunication networks has been rising steadily due to the expansion of networks, power-hungry equipment and ever-increasing consumer demand. This contributes significantly to the world’s carbon footprint and greenhouse emissions. In particular, radio access networks (RANs) have been identified to have a larger contribution to the energy consumption of telecommunication networks, and a thorough evaluation is required to understand the avenues for energy reduction. In light of that, this study discusses various strategies to lower RAN power usage to minimize telecommunication’s environmental effect. Furthermore, a two-pronged strategy that combines dynamic operation management of base stations (BSs) and renewable energy integration is introduced to reduce the environmental impacts of RANs. With this hybrid strategy energy consumption and carbon footprint may be significantly reduced by using solar and wind energy to power BSs and putting clever dynamic energy management strategies like adaptive sleep modes and real-time power adjustment into practice. The proposed approach guarantees the continuous expansion of telecommunications networks while also being in line with international climate targets. The results highlight how important sustainable practices are to the telecommunication industry and offer a path forward for reducing its environmental effect without compromising dependable and strong connectivity.

关键词： Cellular networks Industries Renewable energy sources Energy consumption Energy efficiency Communications technology Sustainable development Carbon footprint Next generation networking Radio access networks

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Joint Position and Orientation Optimization for 6DMA Enhanced Multi-Access Point Coordination

Joint Position and Orientation Optimization for 6DMA Enhance...

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IEEE Conference on Wireless Communications and Networking

作者： Xiangyu Pi Lipeng Zhu Haobin Mao Zhenyu Xiao School of Electronic and Information Engineering Beihang University Beijing China Department of Electrical and Computer Engineering National University of Singapore Singapore

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

In this paper, we develop a six-dimensional movable antenna (6DMA) enhanced multi-access point (AP) coordination system for coverage enhancement and interference mitigation. First, we model the wireless channels between the APs and UTs to characterize their variation with respect to 6DMA movement, in terms of both the three-dimensional (3D) position and 3D orientation of each distributed AP's antenna. Then, an optimization problem is formulated to maximize the weighted sum rate of multiple UTs for their uplink transmissions by jointly optimizing the antenna position vector (APV), the antenna orientation matrix (AOM), and the receive combining matrix over all coordinated APs, subject to the constraints on local antenna movement regions. To solve this challenging non-convex optimization problem, we first transform it into a more tractable Lagrangian dual problem. Then, an alternating optimization (AO)-based algorithm is developed by iteratively optimizing the APV and AOM, which are designed by applying the successive convex approximation (SCA) technique and Riemannian manifold optimization-based algorithm, respectively. Simulation results show that the proposed 6DMA-enhanced multi-AP coordination system can significantly enhance network capacity, and can attain considerable performance improvement compared to the conventional fixed antenna (FA)-based schemes.

关键词： Wireless communication Three-dimensional displays Simulation Transmitting antennas Receiving antennas Approximation algorithms Vectors Uplink Optimization Antenna arrays

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Mathematical Model for Increasing Accuracy when Measuring Linear Quantities in Conditions of External Mechanical Impacts 33

Mathematical Model for Increasing Accuracy when Measuring Li...

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33rd International Scientific Symposium Metrology and Metrology Assurance, MMA 2023

作者： Dichev, Dimitar Zhelezarov, Iliya Diakov, Dimitar Dicheva, Ralitza Kupriyanov, Oleksandr Malakov, Ivo Anastasov, Kalin Valkov, Stefan Petrov, Nikolay Technical University of Gabrovo Department of Machine and Precision Engineering Gabrovo Bulgaria Technical University of Sofia Department of Precision Engineering and Measurement Instruments Sofia Bulgaria Ukrainian Engineering Pedagogics Academy Department of Information Computer Technologies and Mathematics Kharkiv Ukraine Technical University of Sofia Department of Automation of Discrete Production Engineering Sofia Bulgaria Technical University of Gabrovo Department of Mechanical Engineering Technology and Machine Tools Gabrovo Bulgaria Technical University of Gabrovo Department of Mathematics Informatics and Natural Sciences Gabrovo Bulgaria

ISBN: (纸本)9798350338102

A new method of error correction of coordinate measuring and technological systems is presented in the article. The method is based on the basic assumptions of the Kalman filter and is aimed at removing errors whose sources have both dynamic and static origins. This universality of the method is provided by a new methodology for defining the model error variance, based on a measurement-computational platform whose input vector is formed by data from a three-axis MEMS accelerometer. © 2023 IEEE.

关键词： Kalman filters

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Product Recognition for Inventory Management Using Spatial Partitioning in a Multi-Camera System

Product Recognition for Inventory Management Using Spatial P...

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IEEE International Conference on Consumer electronics (ICCE)

作者： Viduranga Munasinghe Tae-Ho Lee Tae Sung Kim Jin-Sung Kim Hyuk-Jae Lee Department of Electrical and Computer Engineering Seoul National University Seoul South Korea Department of Electronic Engineering SunMoon University Asan South Korea

ISBN: (数字)9798331521165

ISBN: (纸本)9798331521172

Recent advancements in deep learning have significantly improved object detection capabilities. However, accurately recognizing objects in environments with complex occlusions remains a challenge. For instance, detecting densely packed items on shelves in unmanned stores presents difficulties even for the most cutting-edge deep-learning object detectors. To address this issue, we propose a deep learning-based inventory management system tailored for multi-camera unmanned stores. The proposed method utilizes a Voronoi diagram-based ground plane localization technique along with regions of interest (ROI) obtained by using image difference. A weighted voting algorithm is employed to ensure an accurate inventory check. This approach outperforms conventional ROI detection methods by 10.45% in terms of recognition accuracy.

关键词： Deep learning Location awareness Accuracy Event detection Object detection Inventory management Partitioning algorithms Reliability Object recognition Optimization

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EVENT-ECC: ASYNCHRONOUS TRACKING OF EVENTS WITH CONTINUOUS OPTIMIZATION

arXiv

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arXiv 2024年

作者： Zafeiri, Maria Evangelidis, Georgios Psarakis, Emmanouil Department of Computer Engineering and Informatics University of Patras Greece Snap Inc. Vienna Austria

In this paper, an event-based tracker is presented. Inspired by recent advances in asynchronous processing of individual events, we develop a direct matching scheme that aligns spatial distributions of events at different times. More specifically, we adopt the Enhanced Correlation Coefficient (ECC) criterion and propose a tracking algorithm that computes a 2D motion warp per single event, called event-ECC (eECC). The complete tracking of a feature along time is cast as a single iterative continuous optimization problem, whereby every single iteration is executed per event. The computational burden of event-wise processing is alleviated through a lightweight version that benefits from incremental processing and updating scheme. We test the proposed algorithm on publicly available datasets and we report improvements in tracking accuracy and feature age over state-of-the-art event-based asynchronous *** Codes 68T45, 68U10 © 2024, CC BY.

关键词： Feature extraction

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Monitoring the Parameters Obtained by Photovoltaic Systems 10

Monitoring the Parameters Obtained by Photovoltaic Systems

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10th International Conference on Modern Power Systems, MPS 2023

作者： Lihet, Mihaela-Anamaria Horgoş, Mircea Tirnovan, Radu-Adrian Department of Electric Electronic and Computer Engineering Technical University of Cluj-Napoca Baia Mare Romania Technical University of Cluj-Napoca Department of Electric Power and Management Cluj-Napoca Romania

ISBN: (纸本)9798350326826

The increase of energy demand has made PV modules more affordable for energy consumers. Years of research and monitoring the parameters of PV systems has made the continuous development and improvement of photovoltaic systems possible. This article focuses on the monitoring of parameters obtained by photovoltaic systems installed at several residential buildings. © 2023 IEEE.

关键词： Solar panels

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Wideband Beamforming for Frequency Selective RRS Aided Near-Field Communications

Wideband Beamforming for Frequency Selective RRS Aided Near-...

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IEEE Conference on Wireless Communications and Networking

作者： Zicheng Lin Shuhao Zeng Hongliang Zhang School of Electronic Engineering and Computer Science Peking University Beijing China Department of Electrical and Computer Engineering Princeton University NJ USA School of Electronic and Computer Engineering Peking University Shenzhen Graduate School China School of Electronics Peking University Beijing China

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

To satisfy the high data rate requirements, cellular systems will evolve towards the direction of higher carrier frequencies and larger antenna arrays. The conventional phased arrays are hard to fulfill such a vision due to its excessive power consumption induced by numerous phase shifters. To address this issue, Reconfigurable Refractive Surfaces (RRSs) provide a energy efficient solution without relying on phase shifters. With enlarged radiation aperture and increased working frequency, users are more likely to be located in the near field of the RRS. Moreover, the frequency selectivity of the RRS cannot be neglected given the wideband communications enabled by higher frequency bands. These two effects jointly aggravate the beam split problem where the signal strength of different frequency components cannot concentrate on the user, leading to a data rate degradation. In this paper, we study an RRS-based wideband near-field communication system with multiple users. Unlike most existing works, which only considered the beam split effect under near-field conditions, we jointly consider the influence of the frequency selectivity of RRS and near-field conditions on the beam split effect. To mitigate the beam split effect, the time-delay units are introduced in the RRS elements based on which a beamforming scheme is proposed to improve system data rate by jointly optimizing the digital beamformer, the phase shifts of RRS and the time-delay units. Simulation results demonstrate the effectiveness of our proposed scheme.

关键词： Phased arrays Power demand Array signal processing Simulation Phase shifters Transmitting antennas Energy efficiency Feeds Arrays Wideband

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Validation Of Wind Turbine Model Software Simulation Using Real Time Windspeed Measurements 14

Validation Of Wind Turbine Model Software Simulation Using R...

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14th International Conference on Electrical and electronics engineering, ELECO 2023

作者： Polycarpou, Alexis Shiacallis, Sotiris Christofides, Nicholas Papadakis, Antonis Papadopoulos, Theofilos Ceylan, Oguzhan Frederick University Frederick Research Center Department of Electrical Computer Engineering and Informatics Nicosia Cyprus T.P. Aeolian Dynamics Ltd Cyprus Kyamos Multiphysics Nicosia Cyprus Democritus University of Thrace Electrical and Computer Engineering Department Greece Kadir Has University Deparment of Management Information Systems Istanbul Turkey

ISBN: (纸本)9798350360493

Based on the achievements regarding the 2020 targets, the Renewable Energy Directive established a new, higher target for 2030, reflecting a significant increase of interest for renewable energy sources (RES). As a result, various new software simulation packages, featuring models of RES, have been developed and being used in academia as well as in industry for research, educational or training purposes. In this paper Wind turbine (WT) characteristics and wind speed data obtained from a commissioned wind farm in Cyprus are used to implement a simulation model in two different software programs featuring RES simulation capabilities. Power System computer Aided Design (PSCAD) is used to investigate the electrical power output of a WT model, and KYAMOS software is used to investigate the modelling of the blades, the resulting primary torque and the resulting rotor rotational speed. The investigation result novelty is the establishment of the ability of the proposed, under development, software program to satisfy the three required characteristics. Therefore, Deviation from measured values of the turbine characteristics is observed for both programs, user interface and blade modelling, and the potential of integrating results of one software into the other is investigated. © 2023 IEEE.

关键词： Wind turbines

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Graph Neural Network Based Beamforming and RIS Reflection Design in A Multi-RIS Assisted Wireless Network

arXiv

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arXiv 2025年

作者： Lim, Byungju Vu, Mai Department of Electronic Engineering Pukyong National University Busan Korea Republic of Department of Electrical and Computer Engineering Tufts University Medford United States

We propose a graph neural network (GNN) architecture to optimize base station (BS) beamforming and reconfigurable intelligent surface (RIS) phase shifts in a multi-RIS assisted wireless network. We create a bipartite graph model to represent a network with multi-RIS, then construct the GNN architecture by exploiting channel information as node and edge features. We employ a message passing mechanism to enable information exchange between RIS nodes and user nodes and facilitate the inference of interference. Each node also maintains a representation vector which can be mapped to the BS beamforming or RIS phase shifts output. Message generation and update of the representation vector at each node are performed using two unsupervised neural networks, which are trained offline and then used on all nodes of the same type. Simulation results demonstrate that the proposed GNN architecture provides strong scalability with network size, generalizes to different settings, and significantly outperforms conventional algorithms. © 2025, CC BY-NC-ND.

关键词： Graph neural networks

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General Full-Range Regulation Method for Resonant Switched-Capacitor Converters 3

General Full-Range Regulation Method for Resonant Switched-C...

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3rd IEEE International Power electronics and Application Conference and Exposition, PEAC 2022

作者： Xie, Wenhao Smedley, Keyue Wenzhou University College of Electrical and Electronic Engineering Wenzhou China University of California Department of Electrical Engineering and Computer Science IrvineCA United States

ISBN: (数字)9781665491419

ISBN: (纸本)9781665491419

Previously reported resonant switched-capacitor converters (RSCCs) offer limited voltage regulation under the condition of an extremely wide switching frequency band for light load operation. In this paper, a new general full-range regulation method for RSCCs is proposed for all loads without the need of such wide switching frequency band. The proposed regulation method is applicable to single-inductor RSCCs and dual-inductor RSCCs with the benefits of limited frequency band and soft-switching operation. To promote the understanding, the regulation principle of RSCCs is compared with Buck or Boost converter. Comprehensive analysis of the operation principle and voltage-gain curves is given. Experimental results are presented. © 2022 IEEE.

关键词： DC-DC converters

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