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作者： Bez, Jean Luca Tang, Houjun Breitenfeld, Scot Zheng, Huihuo Liao, Wei-Keng Hou, Kaiyuan Huang, Zanhua Byna, Suren Scientific Data Division Lawrence Berkeley National Laboratory BerkeleyCA United States HDF Group ChampaignIL United States Data Science Group Argonne National Laboratory LemontIL United States Electrical and Computer Engineering Department Northwestern University EvanstonIL United States Computer Science Department Northwestern University EvanstonIL United States Department of Computer Science and Engineering The Ohio State University OH United States

Parallel I/O is a critical technique for moving data between compute and storage subsystems of supercomputers. With massive amounts of data produced or consumed by compute nodes, high-performant parallel I/O is essential. I/O benchmarks play an important role in this process;however, there is a scarcity of I/O benchmarks representative of current workloads on HPC systems. Toward creating representative I/O kernels from real-world applications, we have created h5bench, a set of I/O kernels that exercise hierarchical data format version 5 (HDF5) I/O on parallel file systems in numerous dimensions. Our focus on HDF5 is due to the parallel I/O library's heavy usage in various scientific applications running on supercomputing systems. The various tests benchmarked in the h5bench suite include I/O operations (read and write), data locality (arrays of basic data types and arrays of structures), array dimensionality (one-dimensional arrays, two-dimensional meshes, three-dimensional cubes), I/O modes (synchronous and asynchronous). In this paper, we present the observed performance of h5bench executed along several of these dimensions on existing supercomputers (Cori and Summit) and pre-exascale platforms (Perlmutter, Theta, and Polaris). h5bench measurements can be used to identify performance bottlenecks and their root causes and evaluate I/O optimizations. As the I/O patterns of h5bench are diverse and capture the I/O behaviors of various HPC applications, this study will be helpful to the broader supercomputing and I/O community. © 2024 Lawrence Berkeley National laboratory, The HDF Group, UChicago Argonne, LLC and The Authors. Concurrency and Computation: Practice and Experience published by John Wiley & Sons Ltd.

关键词： Supercomputers

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A Game-Theoretic Framework for Distributed Load Balancing: Static and Dynamic Game Models

arXiv

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arXiv 2025年

作者： Fardno, Fatemeh Rasoul Etesami, S. The Department of Electrical and Computer Engineering and Coordinated Science Laboratory University of Illinois Urbana-Champaign UrbanaIL61801 United States The Department of Industrial and Systems Engineering Department of Electrical and Computer Engineering Coordinated Science Laboratory University of Illinois Urbana-Champaign UrbanaIL61801 United States

Motivated by applications in job scheduling, queuing networks, and load balancing in cyber-physical systems, we develop and analyze a game-theoretic framework to balance the load among servers in both static and dynamic settings. In these applications, jobs/tasks are often held by selfish entities that do not want to coordinate with each other, yet the goal is to balance the load among servers in a distributed manner. First, we provide a static game formulation in which each player holds a job with a certain processing requirement and wants to schedule it fractionally among a set of heterogeneous servers to minimize its average processing time. We show that this static game is a potential game and admits a pure Nash equilibrium (NE). In particular, the best-response dynamics converge to such an NE after n iterations, where n is the number of players. We then extend our results to a dynamic game setting, where jobs arrive and get processed in the system, and players observe the load (state) on the servers to decide how to schedule their jobs among the servers in order to minimize their averaged cumulative processing time. In this setting, we show that if the players update their strategies using dynamic best-response strategies, the system eventually becomes fully load-balanced and the players' strategies converge to the pure NE of the static game. In particular, we show that the convergence time scales only polynomially with respect to the game parameters. Finally, we provide numerical results to evaluate the performance of our proposed algorithms under both static and dynamic settings. Copyright © 2025, The Authors. All rights reserved.

关键词： Queueing networks

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A Survey on Channel Measurements and Models for Underground MIMO Communication systems

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China Communications 2023年第8期20卷 103-119页

作者： Asad Saleem Yejun He Guoxin Zheng Zhining Chen State Key Laboratory of Radio Frequency Heterogeneous Integration Guangdong Engineering Research Center of Base Station Antennas and PropagationShenzhen Key Laboratory of Antennas and PropagationCollege of Electronics and Information EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai UniversityShanghai 200444China Department of Electrical and Computer Engineering National University of SingaporeSingapore

The high reliability of the communication system is critical in metro and mining applications for personal safety,channel optimization,and improving operational *** paper surveys the progress of wireless communication systems in underground environments such as tunnels and mines from 1920 to 2022,including the evolution of primitive technology,advancements in channel modelling,and realization of various wireless propagation *** addition,the existing and advanced channel modeling strategies,which include the evolution of different technologies and their applications;mathematical,analytical,and experimental techniques for radio propagation;and significance of the radiation characteristics,antenna placement,and physical environment of multiple-input multiple-output(MIMO)communication systems,are *** given study introduces leaky coaxial cable(LCX)and distributed antenna system(DAS)designs for improving narrowband and wideband channel *** paper concludes by figuring out open research areas for the future technologies.

关键词： leaky coaxial cable(LCX) long-term evolution for metro(LTE-M) multiple-input multipleoutput(MIMO)systems propagation modeling

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Software-Defined Ultrasonic Communication System using PPM-EMAT with High Transmission Rate

Software-Defined Ultrasonic Communication System using PPM-E...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Huang, Xin Saniie, Jafar Bakhtiari, Sasan Heifetz, Alexander Illinois Institute of Technology Ecasp Research Laboratory Department of Electrical and Computer Engineering ChicagoIL United States Argonne National Laboratory Nuclear Science and Engineering Division LemontIL United States

ISBN: (纸本)9798350346459

A novel approach to ultrasonic communication systems introduces a software-defined system that utilizes Periodic-permanent-magnet electromagnetic acoustic transducers (PPM-EMATs) as transmitters and receivers. Traditional systems had limitations in adaptability and flexibility. The software-defined system provides enhanced versatility, adaptability, and portability, allowing customization for diverse applications. The use of PPM-EMATs is explored for optimizing energy transfer through metal plate channels, generating shear horizontal waves. Experimental tests validate the efficiency of PPM-EMATs, showing successful communication at a 10-kbps bitrate using ASK modulation with a high signal-to-noise ratio (SNR). The research highlights the potential of PPM-EMAT technology in high-speed software-defined ultrasonic communication systems. © 2023 IEEE.

关键词： Signal to noise ratio

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Novel Wideband Beamformers for AESAs

Novel Wideband Beamformers for AESAs

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2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023

作者： Kipfer, Luke J. Kindt, Rick W. Vouvakis, Marinos N. University of Massachusetts Department of Electrical and Computer Engineering AmherstMA01003 United States Naval Research Laboratory WashingtonDC20375 United States

ISBN: (纸本)9781665442282

This work describes a RF beamforming phased array architecture enabled by a novel wideband polyphase combiner/divider that generates 36 differential I/Q pairs (144 outputs) over 10-20GHz (66% fractional bandwidth). The polyphase combiner is designed in LTCC technology and fuses together two stacked parallel-plate waveguide (PPWG) radial power combiners with a 5-stage PPWG branch-line hybrid coupler. Through rigorous full-wave simulations, it is shown that multiple wideband 0°, 90°, 180°, and 270° phases are produced with © 2023 IEEE.

关键词： Beamforming

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Edge Deployment of Vision-Based Model for Human Following Robot 23

Edge Deployment of Vision-Based Model for Human Following Ro...

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23rd International Conference on Control, Automation and systems, ICCAS 2023

作者： Manzoor, Sumaira Kim, Eun-Jin Bae, Sang-Hyeon Kuc, Tae-Yong Creative Algorithms and Sensor Evolution Laboratory Suwon85761 Korea Republic of Sungkyunkwan University Department of Electrical and Computer Engineering Suwon2066 Korea Republic of

ISBN: (纸本)9788993215274

Mobile robots are proliferating at a significant pace and the continuous interaction between humans and robots opens the doors to facilitate our daily life activities. Following the target person with the robot is an important human-robot interaction (HRI) task that leads to its applications in industrial, domestic, and medical assistant robots. To implement the robotic tasks, traditional solutions rely on cloud servers that cause significant communication overhead due to data offloading. In our work, we overcome this potential issue of cloud-based solutions, by implementing the task of a hum-following robot (HFR) at the Nvidia Jetson Xavier NX edge platform. To perform the HFR task, typical approaches track the target person only from behind. While, our work allows the robot to track the person from behind, front, and side views (left & right). In this article, we combine the latest advances of deep learning and metric learning by presenting two trackers: Single Person Head Detection-based Tracking (SPHDT) model and Single Person full-Body Detection-based Tracking (SPBDT) model. For both models, we leverage a deep learning-based single object detector called MobileNetSSD with a metric learning-based re-identification model, DaSiamRPN. We perform the qualitative analysis considering six major environmental factors: pose change, illumination variations, partial occlusion, full occlusion, wall corner, and different viewing angles. Based on the better performance of SPBDT, compared to SPHDT in the experimental results, we select SPBDT model for the robot to track the target. We also use this vision model to provide the relative position, location, distance, and angle of the target person to control the robot's movement for performing the human-following task. © 2023 ICROS.

关键词： Object recognition

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Modified H-Plane Sectoral Horn for FSS Sensing Applications

Modified H-Plane Sectoral Horn for FSS Sensing Applications

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2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023

作者： Wilcox, Logan M. Motes, Doyle T. Donnell, Kristen M. Laboratory Department of Electrical and Computer Engineering RollaMO United States Austin Inc. Nondestructive Evaluation Division AustinTX United States

ISBN: (纸本)9781665442282

The use of frequency selective surfaces (FSSs) as sensors has found recent success in the structural health monitoring realm. FSS theory assumes infinite FSS dimensions and planewave illumination. However, in practice, an FSS sensor is finite, and the illuminating field varies across the plane of the sensor. As such, it is of interest to reduce the nonuniformity of the incident electromagnetic energy incident on the sensor. To this end, this work explores the modification of a standard H-plane sectoral horn through the addition of a ridge to generate a uniform electric field over a specified region of interest. In addition to this modified antenna, standard gain (pyramidal) and H-plane sectoral horns were also considered for comparison. The results show that variation in the electric field pattern is reduced for the modified sectoral horn but at the cost of matching properties. © 2023 IEEE.

关键词： Frequency selective surfaces

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Mathematical Modeling of an Anion Exchange Membrane Electrolyzer for Integration in a Novel Solar Photovoltaic-Battery-Green Hydrogen Nanogrid 3

Mathematical Modeling of an Anion Exchange Membrane Electrol...

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3rd International Conference on Energy Transition in the Mediterranean Area, SyNERGY MED 2024

作者： Arsalis, Alexandros Papanastasiou, Panos Georghiou, George E. University of Cyprus PV Technology Laboratory Department of Electrical and Computer Engineering Nicosia Cyprus PHAETHON Centre of Excellence for Intelligent Efficient and Sustainable Energy Solutions Nicosia Cyprus University of Cyprus Department of Civil and Environmental Engineering Nicosia Cyprus

ISBN: (纸本)9798350375923

The Mediterranean area is an ideal location for harnessing solar energy due to the high solar irradiation availability. Utilization of innovative solutions address renewable energy instabilities and optimize the utilization of local clean energy resources. A promising technology is the utilization of green hydrogen subsystem to these solar systems. Such an integration could add significant capabilities, namely, provision of seasonal energy storage, increase of solar photovoltaic capacity, and export of the generated green hydrogen for other uses, such as fueling of hydrogen electric vehicles. A detailed model is developed in this work to assess the performance of the proposed green hydrogen subsystem configuration with a view to utilizing it as part of a future, larger, wholistic energy system. At full-load the model performs at an efficiency of 62.4%, while performance at a 10% part-load is 82.3%. These performance results suggest a very promising potential for this technology which can be harnessed in the future multi-scale energy systems, provided that the economic performance is also promising. © 2024 IEEE.

关键词： Clean energy

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Efficiency Effect of Obstacle Margin on Line-of-Sight in Wireless Networks

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computers, Materials & Continua 2022年第7期72卷 227-242页

作者： Murad A.A.Almekhlafi Taiseer Abdalla Elfadil Eisa Fahd N.Al-Wesabi Abdelzahir Abdelmaboud Manar Ahmed Hamza Abdelwahed Motwakel Ishfaq Yaseen Mohammed Rizwanullah Department of Electrical Engineering–Communication Engineering Sana’a University61101Yemen Department of Information Systems-Girls Section King Khalid UniversityMahayil62529Saudi Arabia Department of Computer Science King Khalid UniversityMuhayel Aseer62529Saudi Arabia Faculty of Computer and IT Sana’a UniversitySana’a61101Yemen Department of Information Systems King Khalid UniversityMuhayel Aseer62529Saudi Arabia Department of Computer and Self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlKharj16278Saudi Arabia

Line-of-sight clarity and assurance are essential because they are considered the golden rule in wireless network planning,allowing the direct propagation path to connect the transmitter and receiver and retain the strength of the signal to be *** the increasing literature on the line of sight with different scenarios,no comprehensive study focuses on the multiplicity of parameters and basic concepts that must be taken into account when studying such a topic as it affects the results and their ***,this research aims to find limited values that ensure that the signal reaches the future efficiently and enhances the accuracy of these values’*** have designed MATLAB simulation and programming programs by Visual *** for a semi-realistic communication *** includes all the basic parameters of this system,taking into account the environment’s diversity and the characteristics of the obstacle between the transmitting station and the receiving *** we verified the correctness of the system’s ***,we begin by analyzing and studying multiple and branching cases to achieve the *** get several values from the results,which are finite values,which are a useful reference for engineers and designers of wireless networks.

关键词： Line of sight obstacle margin wireless networks communication link radio wave propagation

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Cramér-Rao bounds of near-field positioning based on electromagnetic propagation model

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IEEE Transactions on Vehicular Technology 2023年第11期72卷 13808-13825页

作者： Chen, Ang Chen, Li Chen, Yunfei You, Changsheng Wei, Guo Yu, F. Richard University of Science and Technology of China CAS Key Laboratory of Wireless Optical Communication Hefei230027 China University of Durham Department of Engineering DurhamDH1 3LE United Kingdom Southern University of Science and Technology Department of Electronic and Electrical Engineering Shenzhen518055 China Carleton University Department of Systems and Computer Engineering OttawaONK1S 5B6 Canada

The adoption of large-scale antenna arrays at high-frequency bands is widely envisioned in the beyond 5G wireless networks. This leads to the near-field regime where the wavefront is no longer planar but spherical, bringing new opportunities and challenges for communications and positioning. In this article, we improve the near-field positioning technology from the classical spherical wavefront model (SWM) to the more accurate and true electromagnetic propagation model (EPM). A generic near-field positioning model with different observation capabilities for three electric field types (vector, scalar, and overall scalar electric field) is developed based on the complete EPM. For these three observed electric field types, the Cramér-Rao bound (CRB) is adopted to evaluate the achievable estimation accuracy. The expressions of the CRBs for different electric field observations are derived by combining electromagnetic propagation concepts with estimation theory. Closed-form expressions can be further obtained as the terminal is assumed to be on the central perpendicular line (CPL) of the receiving antenna surface. Moreover, the above discussions are extended to the system with multiple receiving antennas. In this case, the CRBs using various electric field types are derived and the effect of different numbers of receiving antennas is deeply investigated. Numerical results are provided to quantify the CRBs and validate the analytical results. Also, the impact of different system parameters, including electric field type, wavelength, size of the receiving antenna, and number of antennas, is evaluated. © 1967-2012 IEEE.

关键词： Electric fields

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