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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Venkata Raghavendra, I. Lyu, Yanda Wang, Fred Chatterjee, Debanjan Cairoli, Pietro The University of Tennessee Department of Electrical Engineering and Computer Science KnoxvilleTN United States Abb Inc Us Corporate Research Center Raleigh United States

ISBN: (纸本)9798350376067

Integrated Motor Drives (IMDs), play a pivotal role in the ever-evolving landscape of technological advancements in fields such as electric transportation and industrial environments. IMDs face challenges managing heat dissipation from drive-switching devices, especially due to confined spaces and dynamic loads, intensified by elevated temperatures near motor heat sources. To overcome thermal challenges, Wideband gap devices are crucial for minimizing losses and enabling diverse heatsink layout configurations within natural cooling. This paper introduces a thermal design approach that employs an analytical thermal model to select extruded heatsinks. The heatsink lengths are then fine-tuned to limit device junction temperatures under dynamic load variations across various heatsink layout configurations. The validation of the analytical and CFD models is then demonstrated through experimental setup. Subsequently, for a 2-level VSI device placement, a comparative analysis is conducted on the heatsink designs selected across various layout configurations, with endeavours focused on identifying the layout configuration that gives out the highest power density. © 2024 IEEE.

关键词： Thermal modeling

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Data management in Ethereum DApps: A cost and performance analysis

Data management in Ethereum DApps: A cost and performance an...

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作者： Kostamis, Periklis Sendros, Andreas Efraimidis, Pavlos S. Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi67100 Greece Institute for Language and Speech Processing Athena Research Center Xanthi67100 Greece

The cost of interacting with a blockchain and the time required to search and retrieve information from it are important factors in the design of Decentralized Applications (DApps). The corresponding approaches for data management in Ethereum vary from pure on-chain solutions to hybrid architectures. In this work, we thoroughly examine a wide range of data management methods, including unconventional ones, and evaluate them in terms of storage cost and retrieval latency while considering the impact of recent hard forks. More precisely, we elaborate on the use of Smart Contract (SC) storage as a data store for DApps and in view of the prohibitive cost inherent to this approach, we present and compare methods for low-cost data handling in Ethereum, namely the event-logs, the transaction payload, and the almost surprising exploitation of unused function arguments. In addition, we study hybrid schemes by using IPFS and Swarm as storage platforms and Ethereum as a timestamping proof mechanism. Such schemes are especially effective when large chunks of data have to be managed. The upload and retrieval performance of these platforms and the cost associated with storing (on-chain) the identifiers of the uploaded data are of utmost importance and therefore are investigated in detail. © 2023

关键词： Smart contract

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Diverse Effects of Defects on the Performance of Organic Light-Emitting Diodes

Diverse Effects of Defects on the Performance of Organic Lig...

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SID International Symposium Digest of Technical Papers, 2023

作者： Lee, Jaesang Department of Electrical and Computer Engineering Inter-University Semiconductor Research Center Seoul National University Seoul08826 Korea Republic of

Defects in organic light-emitting diodes (OLEDs) generate the electronic states whose energy level are usually found in the energy gap of OLED materials. Hence, defects can disturb the movement of, and sometimes eliminate, the charges and excitons in OLEDs. Here, we discuss how the properties of the defects, i.e., their originating positions, energy levels and densities, affect the dynamics of the charges and excitons, thereby determining the electrical and optical performance of the comprising OLEDs. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Defects

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Microgrid Energy Management with Energy Storage Systems:A Review

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 483-504页

作者： Xiong Liu Tianyang Zhao Hui Deng Peng Wang Jizhen Liu Frede Blaabjerg Energy Electricity Research Center Jinan UniversityZhuhai 519070China School of Electrical and Electronic Engineering Nanyang Technological University639798 Singapore School of Control and Computer Engineering North China Electric Power UniversityBeijing 102206China Department of Energy Technology at Aalborg University Denmark

Microgrids(MGs)are playing a fundamental role in the transition of energy systems towards a low carbon future due to the advantages of a highly efficient network architecture for flexible integration of various DC/AC loads,distributed renewable energy sources,and energy storage systems,as well as a more resilient and economical on/off-grid control,operation,and energy ***,MGs,as newcomers to the utility grid,are also facing challenges due to economic deregulation of energy systems,restructuring of generation,and marketbased *** paper comprehensively summarizes the published research works in the areas of MGs and related energy management modelling and solution ***,MGs and energy storage systems are classified into multiple branches and typical combinations as the backbone of MG energy ***,energy management models under exogenous and endogenous uncertainties are summarized and extended to transactive energy *** programming,adaptive dynamic programming,and deep reinforcement learning-based solution methods are investigated accordingly,together with their implementation ***,problems for future energy management systems with dynamics-captured critical component models,stability constraints,resilience awareness,market operation,and emerging computational techniques are discussed.

关键词： Architecture energy management energy storage systems microgrids optimization uncertainty models

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In-Ga-Zn-O Synaptic Transistor with 1 μm Channel Length for Neuromorphic Computing

In-Ga-Zn-O Synaptic Transistor with 1 μm Channel Length for...

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SID International Symposium Digest of Technical Papers, 2023

作者： Park, Junhyeong Jang, Yuseong Lee, Jinkyu Lee, Soo-Yeon Department of Electrical and Computer Engineering Inter-university Semiconductor Research Center Seoul National University Seoul08826 Korea Republic of

In this paper, indium-gallium-zinc-oxide synaptic transistors with different channel lengths ranging from 2 μm to 1 μm were demonstrated. Channel scaling effect on synaptic behaviors such as long-term depression and long-term potentiation was investigated. A spiking neural network simulation was conducted to verify our synaptic transistor with a channel length of 1 μm, achieving high classification accuracy of 98.05%. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Neural networks

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Feature Enhancer Segmentation Network (FES-Net)for Vessel Segmentation

Feature Enhancer Segmentation Network (FES-Net)for Vessel Se...

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2023 International Conference on Digital Image Computing: Techniques and Applications, DICTA 2023

作者： Khan, Tariq M. Arsalan, Muhammad Iqbal, Shahzaib Razzak, Imran Meijering, Erik School of Computer Science & Engineering Unsw Sydney Australia Qatar University Kindi Center for Computing Research Doha2713 Qatar Department of Electrical and Computer Engineering Islamabad Pakistan

ISBN: (纸本)9798350382204

Diseases such as diabetic retinopathy and age-related macular degeneration pose a significant risk to vision, highlighting the importance of precise segmentation of retinal vessels for tracking and diagnosis of progression. However, existing vessel segmentation methods that heavily rely on encoder-decoder structures struggle to capture contextual information about retinal vessel configurations, leading to challenges in reconciling semantic disparities between encoder and decoder features. To address this, we propose a novel feature enhancement segmentation network (FES-Net) that achieves accurate pixel-wise segmentation without requiring additional image enhancement steps. FES-Net directly processes the input image and utilizes four prompt convolutional blocks (PCBs) during downsampling, complemented by a shallow upsampling approach to generate a binary mask for each class. We evaluate the performance of FES-Net on four publicly available state-of-the-art datasets: DRIVE, STARE, CHASE, and HRF. The evaluation results clearly demonstrate the superior performance of FES-Net compared to other competitive approaches documented in the existing literature. © 2023 IEEE.

关键词： Image enhancement

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Real time enhancement of operator's ergonomics in physical human - robot collaboration scenarios using a multi-stereo camera system

Real time enhancement of operator's ergonomics in physical h...

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2023 IEEE International Conference on Industrial Technology, ICIT 2023

作者： Arvanitis, Gerasimos Piperigkos, Nikos Anagnostopoulos, Christos Lalos, Aris S. Moustakas, Konstantinos University of Patras Department of Electrical and Computer Engineering Patra Greece Industrial Systems Institute Athena Research Center Patra Greece

ISBN: (纸本)9798350336504

In collaborative tasks where humans work alongside machines, the robot's movements and behaviour can have a significant impact on the operator's safety, health, and comfort. To address this issue, we present a multi-stereo camera system that continuously monitors the operator's posture while they work with the robot. This system uses a novel distributed fusion approach to assess the operator's posture in real-time and to help avoid uncomfortable or unsafe positions. The system adjusts the robot's movements and informs the operator of any incorrect or potentially harmful postures, reducing the risk of accidents, strain, and musculoskeletal disorders. The analysis is personalized, taking into account the unique anthropometric characteristics of each operator, to ensure optimal ergonomics. The results of our experiments show that the proposed approach leads to improved human body postures and offers a promising solution for enhancing the ergonomics of operators in collaborative tasks. © 2023 IEEE.

关键词： Ergonomics

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Road Traffic Density Estimation for Adaptive Beam Allocation in an ISAC Setup

Road Traffic Density Estimation for Adaptive Beam Allocation...

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2023 International Symposium on Networks, computers and Communications, ISNCC 2023

作者： Al Amiri, Wesam Guo, Terry N. Mackenzie, Allen B. Department of Electrical and Computer Engineering United States Tennessee Tech University Center of Manufacturing Research CookevilleTN United States

ISBN: (纸本)9798350335590

In this paper, we propose and study a particular use case capable of performing radio-based traffic density estimation for adaptive beam allocation. The proposed scheme explores the synergy between communication and sensing from an Integrated sensing and communication (ISAC) perspective. The traffic den-sity estimation is aided by communication functionality, which involves reusing communication waveforms and utilizing multi-beam forming and sweeping techniques. Meanwhile, the sensing outcomes assist in proactively allocating radio beams. There have been accurate traffic monitoring methods relying on a large number of detectors. However, these traditional techniques have some shortcomings, and it is necessary to explore alternative traffic density estimation approaches. In this regard, we exploit orthogonal frequency division multiplexing (OFDM) communication signals of opportunity reflected from targets (vehicles) to estimate the traffic density of a road section by using Jensen-Shannon (JS) divergence and weighted-centroid interpolation based on a few samples of density scenarios. Then, we present a millimeter-wave (mmWave) adaptive beam allocation protocol based on the traffic density estimation to enhance communication coverage for the vehicular users in the area of interest. The simulation results demonstrate that our traffic density estimation can handle a wide range of targets with a relatively low estimation error. In addition, the analysis of the adaptive beam allocation shows that it effectively improves the quality of service (QoS, in terms of outage probability) of the communication system. © 2023 IEEE.

关键词： Millimeter waves

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MOCBOA:Multi-Objective Chef-Based Optimization Algorithm Using Hybrid Dominance Relations for Solving engineering Design Problems

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computer Modeling in engineering & Sciences 2025年第4期143卷 967-1008页

作者： Nour Elhouda Chalabi Abdelouahab Attia Abdulaziz S.Almazyad Ali Wagdy Mohamed Frank Werner Pradeep Jangir Mohammad Shokouhifar Computer Science Department University of M’silaIchebiliaM’sila28000Algeria Computer ScienceDepartment Mohamed El Bachir El IbrahimiUniversity of Bordj BouArreridjBordj BouArreridj34000Algeria Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia Operations Research Department Faculty of Graduate Studies for Statistical ResearchCairo UniversityGiza12613Egypt Applied Science Research Center Applied Science Private UniversityAmman11931Jordan Faculty of Mathematics Otto-von-Guericke UniversityMagdeburg39016Germany University Centre for Research and Development Chandigarh UniversityMohali140413India Department of Electrical and Computer Engineering Shahid Beheshti UniversityTehran14399Iran DTU AI and Data Science Hub(DAIDASH) Duy Tan UniversityDa Nang550000Vietnam

Multi-objective optimization is critical for problem-solving in engineering,economics,and *** study introduces the Multi-Objective Chef-Based Optimization Algorithm(MOCBOA),an upgraded version of the Chef-Based Optimization Algorithm(CBOA)that addresses distinct *** approach is unique in systematically examining four dominance relations—Pareto,Epsilon,Cone-epsilon,and Strengthened dominance—to evaluate their influence on sustaining solution variety and driving convergence toward the Pareto *** comparison investigation,which was conducted on fifty test problems from the CEC 2021 benchmark and applied to areas such as chemical engineering,mechanical design,and power systems,reveals that the dominance approach used has a considerable impact on the key optimization measures such as the hypervolume *** paper provides a solid foundation for determining themost effective dominance approach and significant insights for both theoretical research and practical applications in multi-objective optimization.

关键词： Multi-objective optimization chef-based optimization algorithm(CBOA) pareto dominance epsilon dominance cone-epsilon dominance strengthened dominance

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Drawing Order Diagrams Through Two-Dimension Extension

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Journal of Graph Algorithms and Applications 2023年第9期27卷 783-802页

作者： Dürrschnabel, Dominik Hanika, Tom Stumme, Gerd Knowledge & Data Engineering Group Research Center for Information System Design & Department of Electrical Engineering and Computer Science University of Kassel Germany Institute of Computer Science University of Hildesheim Germany Berlin School of Library and Information Science Humboldt-Universität zu Berlin Germany

Ordinal real-world data such as concept hierarchies, ontologies, genealogies, or task dependencies in scheduling often has the property to not only contain pairwise comparable, but also incomparable elements. Order diagrams provide an important tool for understanding and thus discovering knowledge in such data. Easily readable drawings of such order diagrams are hard to come by, even for small ordered sets. Many attempts were made to transfer classical graph drawing approaches to order diagrams. Although these methods produce satisfying results for some ordered sets, they unfortunately perform poorly in general. In this work, we present the novel algorithm DimDraw to decompose an ordered set (e.g., a concept hierarchy) in linear orders and to produce a corresponding order diagram. This algorithm is based on a relation between the dimension of an ordered set and the bipartiteness of its transitive incompatibility graph. To evaluate the quality of the algorithm, a user study was conducted where generated drawings were compared with ones from state-of-the-art drawing algorithms. © 2023 Brown University. All rights reserved.

关键词： Set theory

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