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Blockchain Computing and Applications (BCCA), International Conference on

作者： Ahmed Farouk Yeddou Adel Belouchrani Abdellah Mokrane LAGA Paris VIII University Saint-Denis France Electrical Engineering Department/LDCCP Ecole Nationale Polytechnique Algiers Algeria

ISBN: (数字)9798350351538

ISBN: (纸本)9798350351545

Blockchain technology has emerged as a transformative force across various industries, including the energy sector. It has notable potential to enhance efficiency, security, and transparency in peer-to-peer energy trading systems within smart grids. However, the diverse and often incompatible nature of different blockchain platforms poses significant interoperability challenges. This paper explores the critical issue of blockchain interoperability in the context of peer-to-peer energy trading in smart grids. We review existing interoperability mechanisms such as notary mechanisms, relay chains, hashed time-locked contracts, and blockchain routers, evaluating their applicability and limitations. Additionally, we propose an innovative approach leveraging Layer Zero for seamless cross-chain communication. Our proposed system utilizes an ERC-20 compatible cryptocurrency for secure and accurate energy trading, ensuring the integrity of transactions through token burning and minting processes. Through detailed analysis and case studies, this paper aims to provide a comprehensive understanding of how decentralized technologies can be harnessed to create a more efficient, secure, and sustainable energy system. The findings highlight the importance of overcoming interoperability challenges to fully realize the benefits of blockchain in the energy sector.

关键词： Renewable energy sources Accuracy Reviews Blockchains Smart grids Peer-to-peer computing Cryptocurrency Security Relays Interoperability

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Distributed Time-Slotted Channel Hopping in IoT Networks Using Multi-Agent Bernoulli Bandits

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IEEE Transactions on Cognitive Communications and Networking 2025年

作者： Dutta, Hrishikesh Crespi, Noel Bhuyan, Amit Kumar Institut Polytechnique de Paris Data Intelligence and Communication Engineering Lab Telecom SudParis France Michigan State University Electrical and Computer Engineering Department United States

The proliferation of Internet-of-Things (IoT) devices has led to significant challenges in managing radio access and energy efficiency in resource-constrained wireless sensor networks (WSNs). The Time-Slotted Channel Hopping (TSCH) protocol, part of the IEEE 802.15.4e standard, offers a promising solution for addressing these challenges, particularly through its collision-free scheduling mechanism. However, existing TSCH scheduling schemes often rely on centralized coordination or extensive control message exchanges, leading to inefficiencies in terms of energy consumption and bandwidth usage. We propose a novel decentralized TSCH scheduling framework driven by Bernoulli Multi-Armed Bandit (MAB) learning. Our approach enables each node to independently learn and optimize its transmission schedule without requiring control information from a central server or neighboring nodes. We explore multiple bandit action selection policies, including -greedy, Upper Confidence Bound (UCB), and Thompson Sampling, and highlight their limitations in low data-rate networks. To overcome these challenges, we introduce a Low-Rate Resilient Policy (LRRP) that enhances TSCH scheduling in sparse traffic conditions by synthesizing packets to compensate for sample deficiencies. Experimental results demonstrate that our framework achieves collision-free scheduling and substantial energy savings while ensuring scalability for large networks. The proposed method outperforms traditional policies, particularly in heterogeneous and low-traffic environments, making it highly suitable for resource-constrained IoT networks. The bandit-driven scheduling approach is shown to achieve upto ≈19% increase in throughput for a 50-nodes IoT network, compared with existing scheduling mechanism. © 2015 IEEE.

关键词： Energy efficiency

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Performance Optimization of Energy-Harvesting Underlay Cognitive Radio Networks Using Reinforcement Learning

Performance Optimization of Energy-Harvesting Underlay Cogni...

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International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Deemah H. Tashman Soumaya Cherkaoui Walaa Hamouda Department of Computer and Software Engineering Polytechnique Montreal Montreal Canada Department of Electrical and Computer Engineering Concordia University Montreal Canada

In this paper, a reinforcement learning technique is employed to maximize the performance of a cognitive radio network (CRN). In the presence of primary users (PUs), it is presumed that two secondary users (SUs) access the licensed band within underlay mode. In addition, the SU transmitter is assumed to be an energy-constrained device that requires harvesting energy in order to transmit signals to their intended destination. Therefore, we propose that there are two main sources of energy; the interference of PUs’ transmissions and ambient radio frequency (RF) sources. The SU will select whether to gather energy from PUs or only from ambient sources based on a predetermined threshold. The process of energy harvesting from the PUs’ messages is accomplished via the time switching approach. In addition, based on a deep Q-network (DQN) approach, the SU transmitter determines whether to collect energy or transmit messages during each time slot as well as selects the suitable transmission power in order to maximize its average data rate. Our approach outperforms a baseline strategy and converges, as shown by our findings.

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Capacitively Isolated 400 Mbps Data Transfer System with 2 Ns Propagation Delay and 5 kV /µs Common Mode Transient Immunity

Capacitively Isolated 400 Mbps Data Transfer System with 2 N...

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： Isa Altoobaji Ahmad Hassan Mohamed Ali Yves Audet Ahmed Lakhssassi Electrical Engineering Department Polytechnique Montreal Montreal QC Canada Department of Engineering and Computer Science University of Quebec in Outaouais Gatineau QC Canada

ISBN: (数字)9798350361759

ISBN: (纸本)9798350361766

This paper presents the implementation and measurements of an isolated capacitively coupled data transfer system capable of sustaining a 355 V rms breakdown voltage in a 3.3 V 0.18 µm CMOS process. The design is based on the pulse amplitude modulation scheme which consumes minimum silicon area and lower propagation delay. The receiver (Rx) demodulation circuit implements a pre-amplification stage to mitigate the common mode (CM) transient surge. Measurement results show that our fabricated chip prototype operates at a wide range of data rates between 1 kbps and 400 Mbps with a propagation delay of 2 ns. Moreover, the differential architecture achieves 5 kV/µs common mode transient immunity (CMTI). Our presented system shows a total energy consumption of 19.74 ×10 3 pJ/b at 1 Mbps.

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High-Q microring resonator on hybrid Si3N4/ScAlN platform

High-Q microring resonator on hybrid Si3N4/ScAlN platform

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2024 IEEE Photonics Conference, IPC 2024

作者： Liu, Jiangnan Liu, Shuai Al-Hallak, Abdur-Raheem Thériault, Pierre-Luc Wu, You Kena-Cohen, Stéphane Kira, Mack Soltani, Moe Zhang, Zheshen Mi, Zetian University of Michigan Department of Electrical Engineering and Computer Science 1301 Beal Ave. Ann ArborMI United States École Polytechnique de Montréal Department of Engineering Physics 2500 chemin de Polytechnique MontréalH3T 1J4 Canada Raytheon Bbn Technologies 10 Moulton St. Cambridge02138 United States

ISBN: (纸本)9798350361957

关键词： Q factor measurement

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Quantum Dot Laser and Amplifier Enabled Converged Optical and Wireless Access Network Systems

Quantum Dot Laser and Amplifier Enabled Converged Optical an...

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Photonics North

作者： Z.G. Lu G.C. Liu P.J. Poole X.R. Xie J.R. Liu Y.X. Mao P. Barrios Y. Qi M. Vachon C.Y. Song M. Rahim D. Poitras P.H. Ma J. Weber P. Zhao L. Huang Y.R. Guan J.P. Yao K. Wu R.Q. Hui M. O'Sullivan Quantum and Nanotechnologies Research Centre National Research Council Ottawa ON Canada School of Electrical Engineering and Computer Science University of Ottawa Ottawa ON Canada Department of Electrical Engineering Ecole Polytechnique Montreal Montreal QC Canada Department of Electrical Engineering and Computer Science University of Kansas Lawrence KS USA Ciena Inc. Ottawa ON Canada

ISBN: (数字)9798350366365

ISBN: (纸本)9798350366372

We will present different-type InAs/InP quantum dot (QD) coherent comb lasers (CCLs) and semiconductor optical amplifiers (SOAs) around 1550 nm with their detailed technical specifications. By using those QD-CCLs and -SOAs, we have experimentally demonstrated bi-directional millimeter-wave-over-fiber wireless fronthaul transmission links and optical superchannel coherent systems, which have clearly indicated that both QD-CCLs and -SOAs are critical building blocks of achieving broadband and high speed converged optical and wireless access network systems.

关键词： Semiconductor optical amplifiers Integrated optics Quantum dot lasers Stimulated emission Broadband amplifiers Wireless networks Bidirectional control

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Circularly Polarized Metasurface Superstrate Slot Antenna Array Fed by PRGW

Circularly Polarized Metasurface Superstrate Slot Antenna Ar...

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Antennas and Propagation & USNC/URSI National Radio Science Meeting

作者： Mahboubeh Taraji Elham Baladi Marco A. Antoniades Department of Electrical Computer and Biomedical Engineering Toronto Metropolitan University Toronto ON Canada Department of Electrical Engineering Poly-Grames Research Center Polytechnique Montreal Montreal QC Canada

ISBN: (数字)9798350369908

ISBN: (纸本)9798350369915

We present a wideband circularly-polarized 2-by-2 slot antenna array for X-band applications. The feeding network of the antenna is designed using printed ridge gap waveguide (PRGW) technology as a magnetic ground to suppress surface wave propagation and excite a quasi- TEM wave in the air along the ridge. Then, a single layer linear-to-circular polarization converter metasurface is designed and placed on top of the slot antenna array. The unit-cell of the converter contains two identical metallic layers with a combination of a connected Jerusalem cross (JC) and two parasitically coupled LC resonators. The antenna has a compact structure with a low profile, a −10-dB impedance bandwidth of 26% from 8.6 to 11.2 GHz, a 3-dB axial ratio bandwidth of 14% from 9.3 to 10.7 GHz, and an average gain of 13 dBi.

关键词： Surface impedance Slot antennas Surface waves Simulation Metasurfaces Broadband antennas Impedance

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Towards the Development of Large-Scale Multifunction Array Transceiver Systems

Towards the Development of Large-Scale Multifunction Array T...

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Asia-Pacific Conference on Microwave

作者： Yasser Bigdeli Seyed Ali Keivaan Pascal Burasa Ke Wu Department of Electrical Engineering Poly-Grames Research Center Ecole Polytechnique de Montreal Montreal Canada

This paper reviews and examines our recent work on the development of topological transceiver array frontends to enable reconfigurable multi-functionality and deep structural integration at millimeter wave (mmW) and terahertz (THz) frequencies. The theory and principle of an unprecedented virtual transceiver matrix (VTM) technique were proposed with its demonstration through interferometric schemes. This unique topology is based on the selective allocation of receiver and transmitter units that incorporate angle-of-arrival (AoA) and beamforming operations for smart and efficient simultaneous multifunction applications. On the other hand, our proposed ultra-low-power quadrature harmonic self-oscillating mixer (QHSOM) provides the most compact stand-alone quadrature receiver unit ever-developed so far. Its special features can ideally serve in the realization of a reconfigurable distributed large-scale array transceiver. Topology-enabled superiority besides flexible transceiver units sets up a framework for 5G/6G and future development path of multifunction THz systems.

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Unexpected origin of the quantum efficiency reduction in long-wavelength (In,Ga)N light-emitting diodes

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Physical Review Applied 2025年第3期23卷 034002-034002页

作者： Tanay Tak Yi Chao Chow Shuji Nakamura Steven P. DenBaars Claude Weisbuch James S. Speck Materials Department University of California Santa Barbara California 93106 USA Department of Electrical and Computer Engineering University of California Santa Barbara California 93106 USA Laboratoire de Physique de la Matière Condensée Ecole Polytechnique CNRS IP Paris 91120 Palaiseau France

Differential carrier lifetime (DCL) measurements were performed on c-plane InxGa1−xN/GaN single-quantum-well (QW) light-emitting diodes (LEDs) with varying indium-content QWs (x = 13.5%, 16%, 22%), emitting with violet, blue, and green wavelengths. The recombination lifetimes of LEDs were found to increase with increasing indium composition, resulting in increased carrier densities n measured by DCL. Extraction of the A coefficients, which are assumed to not vary with n, and of the effective B(n) and C(n) coefficients of the ABC model of the internal quantum efficiency (IQE) of QWs showed no significant changes in the A coefficient with increasing indium content [In] in the InxGa1−xN QW, and a reduction in the B(n) and C(n) coefficients with increasing [In]. When looking at the Shockley-Read-Hall (SRH) recombination rate An, the radiative recombination rate B(n)n2, and the Auger-Meitner (AM) recombination rate C(n)n3, we observed that at any given n, the SRH rate is the same for the three [In] measured, while the radiative rate decreases (by up to approximately 9 times) and the AM rate decreases (by up to approximately 7 times) with increasing indium content. This shows that the larger reduction in radiative recombination rates relative to nonradiative recombination rates with increasing [In] is the largest contributor to the decreased quantum efficiencies of LEDs (the “green gap”) at any given n. While some of the reduction in the effective recombination coefficients B(n) and C(n) can be explained by the reduced wave-function overlaps of the QW with increasing indium content, the larger reduction of B(n) relative to C(n) motivates further study of the intrinsic recombination coefficients B0 and C0 of bulk InxGa1−xN alloys and how they are related to the effective recombination coefficients B(n) and C(n) in QWs. The relative contributions of nonradiative recombination are enhanced at any given current density due to the sublinear relationship between the carrier den

关键词： Semiconductor quantum wells

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Unsupervised Graph-Generative Network-based PV Condition Monitoring Systems

Unsupervised Graph-Generative Network-based PV Condition Mon...

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IEEE General Meeting Power& Energy Society

作者： Sarah Allahmoradi Shahabodin Afrasiabi Xiaodong Liang Mousa Afrasiabi Jamshid Aghaei Chi Yung Chung Dept. Electrical and Computer Engineering University of Saskatchewan Saskatoon Canada Department of Electrical Engineering School of Energy Systems Lappeenranta University of Technology Lappeenranta Finland Department of Electrical and Computer Engineering The Hong Kong Polytechnique University Hong Kong China

ISBN: (数字)9798350381832

ISBN: (纸本)9798350381849

Condition monitoring plays a pivotal role in the photovoltaic (PV) system’s operation. To overcome issues in conventional PV condition monitoring, in this paper, an unsupervised graph-generative network-based PV condition monitoring system is proposed by considering Gaussian/non-Gaussian noises. The designed network has the ability to handle an imbalanced dataset and high dimensional signals, establish the correlation between time-varying signals in PV systems, and learn spatial-temporal features. The proposed system is validated through an experimental dataset by considering seven abnormal conditions, including PV array faults, PV control system faults, and grid faults. The proposed method appears to be effective under Gaussian/non-Gaussian noises with an accuracy higher than 98%. The superiority of the proposed graph-generative network is demonstrated by comparing with well-known deep- and shallow-based PV condition monitoring systems with 5%- 30% improvements in terms of accuracy and reliability.

关键词： Condition monitoring Photovoltaic systems Accuracy Correlation Noise Probabilistic logic Control systems Robustness Time-varying systems Monitoring

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