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DOMAIN-WALL MOBILITY MEASUREMENTS IN MAGNETOOPTIC MEDIA

IEEE TRANSACTIONS ON MAGNETICS 1994年第6期30卷 4401-4403页

作者： DU, M KRYDER, MH Data Storage System Center Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

Domain wall motion Involved in both writing and erasing processes In Magneto-Optic(MO) recording Is strongly governed by domain wall mobility. This report extends our previous measurements by a highly Sensitive Kerr microscope system of domain wall mobility in MO media to temperature ranges near the Curie temperature (T-c). The velocity of wall motion is measured as a function of the applied field in samples of GdTbFe and GdTbFeCo, with different compositions and compensation temperatures. The experimental temperature ranges from 60 degrees C to 10 degrees C below T-c. The collected data show that for samples of different composition the domain wall mobilities increase approximately exponentially as the temperature approaches T-c from about 0.02 cm/sec-Oe to 5 cm/sec-Oe.

关键词： Magnetic field measurement Magnetic domain walls Temperature distribution Temperature sensors Velocity measurement Pulse measurements Microscopy Dielectric substrates Laser mode locking Magnetooptic recording

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Micromagnetic principles in pseudo spin valve memory element design

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IEEE TRANSACTIONS ON MAGNETICS 1997年第5期33卷 3286-3288页

作者： Zheng, YF Zhu, JG Data Storage System Center Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

Micromagnetic modeling of submicron size pseudo spin valve memory elements is presented, The storage mechanism of the memory system is proposed. For this mechanism, the switching field of the hard layer and the back switching field of the soft layer need to be well separated to ensure the non-destructive read-out, As the size of the element is reduced, the back switching field of the soft layer greatly increases, It is found that this back switching field can be significantly reduced by introducing a transverse anisotropy field in the soft layer. It is also found that the existence of an antiparallel edge domain configuration in the memory element can significantly degrade the performance of the memory cell and cause instability.

关键词： Micromagnetics Spin valves Anisotropic magnetoresistance Degradation

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Coalition Formation for Heterogeneous Federated Learning Enabled Channel Estimation in RIS-assisted Cell-free MIMO

arXiv

引用

arXiv 2025年

作者： Qi, Nan Liu, Haoxuan Tsiftsis, Theodoros A. Boulogeorgos, Alexandros-Apostolos A. Zhou, Fuhui Jin, Shi Wu, Qihui Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China Department of Informatics and Telecommunications University of Thessaly Lamia35100 Greece Department of Electrical and Computer Engineering University of Western Macedonia Kozani50100 Greece National Mobile Communications Research Laboratory Frontiers Science Center for Mobile Information Communication and Security Southeast University Nanjing210096 China

Downlink channel estimation remains a significant bottleneck in reconfigurable intelligent surface-assisted cell-free multiple-input multiple-output communication systems. Conventional approaches primarily rely on centralized deep learning methods to estimate the high-dimensional and complex cascaded channels. These methods require data aggregation from all users for centralized model training, leading to excessive communication overhead and significant data privacy concerns. Additionally, the large size of local learning models imposes heavy computational demands on end users, necessitating strong computational capabilities that most commercial devices lack. To address the aforementioned challenges, a coalition-formation-guided heterogeneous federated learning (FL) framework is proposed. This framework leverages coalition formation to guide the formation of heterogeneous FL user groups for efficient channel estimation. Specifically, by utilizing a distributed deep reinforcement learning (DRL) approach, each FL user intelligently and independently decides whether to join or leave a coalition, aiming at improving channel estimation accuracy, while reducing local model size and computational costs for end users. Moreover, to accelerate the DRL-FL convergence process and reduce computational burdens on end users, a transfer learning method is introduced. This method incorporates both received reference signal power and distance similarity metrics, by considering that nodes with similar distances to the base station and comparable received signal power have a strong likelihood of experiencing similar channel fading. Massive experiments performed that reveal that, compared with the benchmarks, the proposed framework significantly reduces the computational overhead of end users by 16%, improves data privacy, and improves channel estimation accuracy by 20%. © 2025, CC BY.

关键词： Federated learning

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An Algorithm for the Protection of Distribution Feeders Using the Stockwell and Hilbert Transforms Supported Features

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CSEE Journal of Power and Energy systems 2021年第6期7卷 1278-1288页

作者： OM Prakash Mahela Jaya Sharma Bipul Kumar Baseem Khan Hassan Haes Alhelou the Power System Planning Division Rajasthan Rajya Vidyut Prasaran Nigam Ltd.Jaipur-302005India Department of Electrical Engineering Rajasthan College of Engineering for WomenJaipurIndia the Department of Electrical and Computer Engineering Hawassa UniversityHawassa 1530Ethiopia the Department of Electrical Power Engineering Faculty of Mechanical and Electrical EngineeringTishreen UniversityLattakia 2230Syria

Faults’recognition in the distribution feeders(DFs)is extremely important for improving the reliability of the distribution ***,this paper proposes a technique to identify the faults on the DF using the Stockwell Transform(ST)dependent variance feature and Hilbert transform(HT)by utilizing current *** element to element multiplication of the H-index,we compute using HT aided decompositions of current waveforms and VS-index,and calculate through ST aided decomposition of current *** utilizing the decision rules,various faults are *** faults studied in this work are line to ground,double line,double line to ground and 3-Φto *** high fault impedance,this technique is effectively ***,variations in the fault incidence angles are also utilized to test the performance of the proposed *** perform the proposed algorithm,a IEEE-13 bus system is developed in MATLAB/Simulink *** algorithm effectively classified the faults with accuracy greater than 98%.The algorithm is also successfully validated on the IEEE-34 bus test ***,the algorithm was successfully validated on the practical power system *** is recognized that the developed method performed better than the discrete Wavelet transform(DWT)and ruled decision tree based protection scheme reported in various literature.

关键词： Fault classification fault recognition H-index VS-index

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A novel integrated ultraviolet photodetector based on standard CMOS process

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Chinese Physics B 2015年第3期24卷 418-422页

作者：汪涵金湘亮陈长平田满芳朱柯翰 Faculty of Materials Optoelectronics and PhysicsXiangtan University Hunan Engineering Laboratory for Microelectronics Optoelectronics and System on a Chip Electrical and Computer Engineering Department Boise State University

A novel integrated ultraviolet（UV） photodetector has been proposed, which realizes a high UV selectivity by combining a conventional UV-selective photodiode with an extra infrared（IR） photodiode. The IR photodiode is designed for compensating the photocurrent response of the UV photodiode in the infrared band and is 15 times smaller than the UV one. The integrated photodetector has been fabricated in a 0.35 μm standard CMOS technology. Some critical performance indices of this new structure photodetector, such as spectral responsivity, breakdown voltage, quenching waveform, and transient response, are measured and analyzed. Test results show that the complementary UV–IR photodetector has a maximum spectral responsivity of 0.27 A·W-1 at the wavelength of 400 nm. The device has a high UV selectivity of 3000,which is much higher than that of the single UV photodiode.

关键词： ultraviolet photodetector compensating parasitic photocurrent UV selectivity CMOS process

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Magnetic properties of FeAlN films at elevated temperatures

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JOURNAL OF APPLIED PHYSICS 1997年第8期81卷 4495-4497页

作者： Zheng, P Bain, JA Kryder, MH Data Storage System Center Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213.

FeAlN films were fabricated by reactive sputtering from an Fe alloy target in a nitrogen containing plasma. By varying the nitrogen content in the films, magnetic moment as high as 20 kG and coercivities less than 1 Oe can be achieved at room temperature. However, it has been observed that the soft properties of these films experience a reversible degradation at elevated measuring temperatures. The critical temperature, T-0(c), defined as the temperature at which the coercivity doubles, generally decreases as more nitrogen is incorporated into the film. T-0(c) agrees well with the temperature where remanent squareness (B-r/B-s) equals 0.83, indicating a reduced intergranular exchange coupling in films. However, T-0(c) is far below either the reported Curie temperature of the gamma'-Fe4N phase or that of the alpha-Fe phase, which are found in these films. It is suggested that an interfacial granular phase between the grain boundaries of alpha-Fe or gamma'-Fe4N crystallites is responsible for the low T-0(c). When the temperature increases above T-0(c), the interfacial phase becomes paramagnetic, and the exchange interaction between crystalline grains becomes weak, thereby causing the coercivity increases. (C) 1997 American Institute of Physics.

关键词： iron alloys aluminium alloys ferromagnetic materials magnetic thin films magnetic recording magnetic heads soft magnetic materials magnetic moments coercive force remanence exchange interactions (electron) Curie temperature magnetic particles paramagnetic materials ferromagnetic-paramagnetic transitions sputtered coatings

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A variable precision rough set approach to knowledge discovery in land cover classification

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International Journal of Digital Earth 2016年第12期9卷 1206-1223页

作者： Iftikhar U.Sikder Department of Information System Cleveland State UniversityOHUSA Department of Electrical Engineering and Computer Science Cleveland State UniversityOHUSA

This paper presents a granular computing approach to spatial classification and prediction of land cover classes using rough set variable precision *** particular,it presents an approach to characterizing large spatially clustered data sets to discover knowledge in multi-source supervised *** evidential structure of spatial classification is founded on the notions of equivalence relations of rough set *** allows expressing spatial concepts in terms of approximation space wherein a decision class can be approximated through the partition of boundary *** paper also identifies how approximate reasoning can be introduced by using variable precision rough sets in the context of land cover *** rough set theory is applied to demonstrate an empirical application and the predictive performance is compared with popular baseline machine learning algorithms.A comparison shows that the predictive performance of the rough set rule induction is slightly higher than the decision tree and significantly outperforms the baseline models such as neural network,naïve Bayesian and support vector machine methods.

关键词： Rough set theory soft computing granular computing remote sensing approximate reasoning

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HILBERT-KAMKE EQUATIONS AND GEOMETRIC DESIGNS OF DEGREE FIVE FOR CLASSICAL ORTHOGONAL POLYNOMIALS

arXiv

引用

arXiv 2025年

作者： Mishima, Teruyuki Lu, Xiao-Nan Sawa, Masanori Uchida, Yukihiro Accenture Japan Ltd 2-2-2 Nakanoshima Kita-ku Osaka530-0005 Japan Department of Electrical Electronics and Computer Engineering Faculty of Engineering Gifu University 1-1 Yanagido Gifu-shi Gifu501-1193 Japan Graduate School of System Informatics Kobe University 1-1 Rokkodai Nada Hyogo Kobe657-8501 Japan Department of Mathematical Sciences Graduate School of Science Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji Tokyo192-0397 Japan

In this paper we elucidate the advantage of examining the connections between Hilbert-Kamke equations and geometric designs, or Chebyshev-type quadrature, for classical orthogonal polynomials. We first establish a classification theorem for such equations of degree 5 in 6 variables. The proof is based on an elementary polynomial identity, which Kawada and Wooley (1999) employed in their work on the Waring problem, and some advanced techniques on the computation of the genus of a certain irreducible curve. We then prove a necessary and sufficient condition for the existence of rational solutions of Hilbert-Kamke equations of degree 5, especially for the Chebyshev measure of the first kind. It is noteworthy that this result presents a completely explicit construction of rational solutions. Moreover, we create novel connections among Hilbert-Kamke equations, geometric designs and the Prouhet-Tarry-Escott (PTE) problem. For example, we establish that our solutions of Hilbert-Kamke equations of degree 5 in 6 variables appear in the famous parametric solution for the PTE problem found by Borwein (2002).MSC Codes 33C45, 05E99, 65D32 (Primary) 12E10, 11E76 (Secondary) Copyright © 2025, The Authors. All rights reserved.

关键词： Chebyshev polynomials

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Resource Allocation for Multi-Modal Semantic Communication in UAV Collaborative Networks

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IEEE Transactions on Communications 2025年

作者： Hu, Han Zhu, Xingwu Zhou, Fuhui Wu, Wei Hu, Rose Qingyang Zhu, Hongbo Nanjing University of Posts and Telecommunications Jiangsu Key Laboratory of Wireless Communications Nanjing210003 China Nanjing University of Posts and Telecommunications Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks Ministry of Education Nanjing210003 China Southeast University School of Cyber Science and Engineering Nanjing211189 China Nanjing University of Aeronautics and Astronautics College of Artificial Intelligence Nanjing210000 China Xidian University State Key Laboratory of Integrated Services Networks Xian710071 China Nanjing University of Posts and Telecommunications College of Communication and Information Engineering China Utah State University Department of Electrical and Computer Engineering LoganUT210003 United States

Semantic communication is envisioned as a potential communication paradigm enabled by artificial intelligence and is promising to break the Shannon limit for future 6G networks. This paradigm benefits unmanned aerial vehicles (UAVs) to conserve communication resources and minimize latency by only transmitting task-relevant semantic information. However, resource allocation in the multiple collaborative UAV scenarios remains unexplored, particularly regarding multi-modal semantic communication. To tackle this challenge, this paper investigates a semantic-aware intelligent resource allocation method for multi-UAV-assisted semantic communication networks in the UAV image-sensing task-oriented scenario. A multi-modal semantic communication framework with multi-UAV relay collaboration is developed. At the semantic level, a novel quality of experience (QoE) and the transmission cost model are introduced, based on which a semantic-aware resource allocation problem is formulated, aiming to maximize QoE while minimizing the transmission cost by jointly optimizing the UAV trajectory, the spectrum bandwidth, the transmit power and the number of the transmitted semantic symbols. To deal with optimization challenges involving hybrid variables and coordination among UAVs, a multi-UAV hybrid decision-controlled deep reinforcement learning (DRL) scheme is proposed. Simulation results demonstrate the effectiveness of the proposed scheme compared with the benchmark schemes in achieving a good balance between the QoE and the transmission cost. © 1972-2012 IEEE.

关键词： Deep reinforcement learning

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ONLINE REAL POWER SCHEDULING IN MARGINALLY SECURE POWER-systemS

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IEEE TRANSACTIONS ON POWER APPARATUS AND systemS 1984年第4期103卷 869-873页

作者： NARASIMHAMURTHI, N Power System Laboratory Department of Electrical and Computer Engineering University of Michigan Ann Arbor MI USA

In this paper an efficient algorithm is derived for scheduling real power in systems where the phase angles across lines are not small and, hence, have to be taken into consideration. The approach is based on assigning a cost to the loading on the transmission system. The cost lunction chosen in this paper simplifies the problem of scheduling to a load-flow type problem so that when the solution to the load- flow problem is obtained, the optimal dispatch solution is also automatically obtained. Thus there is no need to alternate between a load-flow step and an optimization step and this results in considerable computational savings.

关键词： Power systems Costs Power generation economics Processor scheduling Propagation losses Scheduling algorithm Power system modeling Power system economics Power transmission lines Power engineering and energy

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