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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Cheng, Jing Niherysh, Kiryl A. Francis, Peter Chakraborty, Debamitra Lombardi, Floriana Erts, Donats Prischepa, Serghej L. Laszcz, Adam Komissarov, Ivan V. Sobolewski, Roman Materials Science Graduate Program University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623-1299 United States Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Institute of Chemical Physics University of Latvia Riga Latvia Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States Dipartimento di Fisica "E.R. Caianiello" Università degli Studi di Salerno Sa FiscianoI-84084 Italy Lukasiewicz Research Network Institute of Microelectronics and Photonics WarszawaPL-02668 Poland

ISBN: (纸本)9781957171395

The dynamics of coherent acoustic phonons in the Bi2Se3 layered crystal system are investigated. The findings reveal that the frequency evolution of breathing modes with the number of the material quintuple layers and the dispersion relation both can be explained by a modified chain model with a nonuniform coupling force. © Optica Publishing Group 2024, © 2024 The Author(s)

关键词： Ultrathin films

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ISLS: IoT-Based Smart Lighting System for Improving Energy Conservation in Office Buildings

arXiv

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arXiv 2025年

作者： Obioma, Peace Agbodike, Obinna Chen, Jenhui Wang, Lei Department of Computer Science University of Manchester M139PL United Kingdom Center for Artificial Intelligence in Medicine Chang Gung Memorial Hospital Guishan Dist Taoyuan33375 Taiwan iTrustal Department of Computer Science and Information Engineering Chang Gung University Guishan Dist. Taoyuan33302 Taiwan Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province School of Software Dalian University of Technology China

With the Internet of Things (IoT) fostering seamless device-to-human and device-to-device interactions, the domain of intelligent lighting systems have evolved beyond simple occupancy and daylight sensing towards autonomous monitoring and control of power consumption and illuminance levels. To this regard, this paper proposes a new do-it-yourself (DIY) IoT-based method of smart lighting system featuring an illuminance control algorithm. The design involves the integration of occupancy and presence sensors alongside a communication module, to enable real-time wireless interaction and remote monitoring of the system parameters from any location through an end-user application. A constrained optimization problem was formulated to determine the optimal dimming vector for achieving target illuminance at minimal power consumption. The simplex algorithm was used to solve this problem, and the system’s performance was validated through both MATLAB simulations and real-world prototype testing in an indoor office environment. The obtained experimental results demonstrate substantial power savings across multiple user occupancy scenarios, achieving reductions of approx. 80%, 48%, and 26% for one, two, and four user settings, respectively, in comparison to traditional basic lighting installation systems. © 2025, CC BY.

关键词： Constrained optimization

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Impossible Differential Analysis on 8-Round PRINCE 9th

Impossible Differential Analysis on 8-Round PRINCE

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9th International Conference on computer engineering and networks, CENet2019

作者： Ding, Yaoling Jia, Keting Wang, An Shi, Ying School of Computer Science Beijing Institute of Technology Beijing100081 China Department of Computer Science and Technology Tsinghua University Beijing100084 China Key Laboratory of Network Assessment Technology CAS Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China

ISBN: (纸本)9789811537523

PRINCE is a lightweight block cipher, which was proposed by Borghoff et al. in Asiacrypt 2012. Various cryptanalytic techniques have been employed to evaluate the security of PRINCE. In 2017, Ding et al. constructed a 4-round impossible differential based on some observations on M′ operation and launched impossible differential attacks on 6- and 7-round PRINCE and the underlying PRINCEcore. In this paper, we explore the differential distribution table (DDT) of the S-box employed in PRINCE and construct a more detailed DDT which contains the input/output values corresponding to each differential. Taking advantage of the table, we compute the subkeys instead of guessing them. With this technique, we extend the impossible differential attacks of PRINCE and PRINCEcore to eight rounds. The corresponding computational and complexities are 110.7 and 62.26 encryptions, respectively, which are much less than exhaustive search. And the data complexities are 64 and 60 chosen plaintexts, respectively. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Cryptography

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Tin Whisker Susceptibility of SAC0307-ZnO Composite Solder Joints

Tin Whisker Susceptibility of SAC0307-ZnO Composite Solder J...

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International Spring Seminar on Electronics Technology

作者： Halim Choi Balá zs Illé s Agata Skwarek Tamá s Hurtony Department of Electronics Technology Faculty of Electrical Engineering and Computer Science Budapest University of Technology and Economics Budapest Hungary Department of Microelectronics &#x0141 ukasiewicz Research Network Institute of Microelectronics and Photonics Krak&#x00F3 w Poland

In the present study, tin (Sn) whisker growth has been observed from SAC0307-ZnO composite solder joints. The commercial SAC0307 solder alloy was reinforced by ZnO nano-particles, which resulted in composite solder joints. The ZnO nano-particles were mixed into the solder paste in a 0.25 wt% volume fraction, using the ball milling process. Solder joints were prepared from the composite solder alloy and from the reference SAC0307, on Ag surface finish by conventional SMT. The solder joints were exposed to an accelerated lifetime test (85 °C/85 RH% THB, 3000 hours) to enhance the Sn whisker growth. Corrosion spots were observed after 1000 hours of aging, and the first whiskers appeared after 1500 hours of aging on the reference SAC0307 solder joints. In the case of the ZnO composite solder joints, non of the previous phenomena were observed during 3000 hours of THB aging. Furthermore the mechanical strength of the solder joints was investigated, but it was found that the ZnO nano-particle could not increase the mechanical properties of the composite solder joints considerably.

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Performance Analysis of MIMO-NOMA Systems with Randomly Deployed Users

arXiv

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arXiv 2022年

作者： Shi, Zheng Yang, Guanghua Fu, Yaru Wang, Hong Ma, Shaodan The School of Electrical and Information Engineering and Institute of Physical Internet Jinan University China Institute of Network Coding The Chinese University of Hong Kong Hong Kong School of Communication and Information Engineering Nanjing University of Posts and Telecommunications China Department of Electrical and Computer Engineering University of Macau Macao China

This paper investigates the performance of Multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems with randomly deployed users, where the randomly deployed NOMA users follow Poisson point process (PPP), the spatial correlation between MIMO channels are characterized by using Kronecker model, and the composite channel model is used to capture large-scale fading as well as small-scale fading. The spatial randomness of users’ distribution, the spatial correlation among antennas and large-scale fading will severally impact the system performance, but they are seldom considered in prior literature for MIMO-NOMA systems, and the consideration of all these impact factors challenges the analysis. Based on zero-forcing (ZF) detection, the exact expressions for both the average outage probability and the average goodput are derived in closed-form. Moreover, the asymptotic analyses are conducted for both high signal-to-noise ratio (SNR) (/small cell radius) and low SNR (/large cell radius) to gain more insightful results. In particular, the diversity order is given by δ = Nr − M + 1, the average outage probability of k-th nearest user to the base station follows a scaling law of O ( Dα(Nr−M+1)+2k) , the average goodput scales as O(D2) and O(D−2) as D → 0 and D → ∞, respectively, where Nr, M, α and D stand for the number of receive antennas, the total number of data streams, the path loss exponent and the cell radius, respectively. The analytical results are finally validated through the numerical analysis. © 2022, CC BY.

关键词： MIMO systems

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Time-Domain Traveling Wave Model of Single-Section Quantum Dot Mode-Locked Lasers with Optical Feedback

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Journal of Harbin Institute of Technology(New Series) 2021年第3期28卷 45-52页

作者： Xuefang Xiao Zewang Zhang Xiupu Zhang School of Opto-electronic and Communication Engineering Xiamen University of TechnologyXiamen 361024FujianChina Key Laboratory of Communication Network and Information Processing in Fujian Province Xiamen 361024FujianChina Photonics Labs. Department of Electrical and Computer EngineeringConcordia UniversityMontreal QC H3G 1M8Canada

The optical feedback modulations of a passively mode-locked semiconductor laser with quantum dot structure were investigated in this study. The delay-induced dynamics of QD MLL under the condition of optical feedback have been studied by exploiting a time domain traveling wave(TDTW) model. The conventional TDTW model was improved to make it suitable for studying optical feedback system, especially the system with long external cavity structure. Combing the TDTW model with optical feedback and carrier rate equations, the pulse variation of a single section QD MLL was studied. This new model shows good agreement with the published experimental data. The roundtrip time and local light intensity modulation to the pulse evolution of QD MLL were studied. The results show that when the time for a light to go to and return from external cavity is equal to the integral times of the period of laser pulse without external feedback, resonance will be formed, and the period of pulse sequence is the shortest. The results also show that the stronger the local light intensity modulation is, the shorter the pulse period is.

关键词： quantum dot structure passively mode-locked laser optical feedback

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Identity-Based Authentication for On-Demand Charging of Electric Vehicles

arXiv

引用

arXiv 2022年

作者： Asokraj, Surudhi Bianchi, Tommaso Brighente, Alessandro Conti, Mauro Poovendran, Radha The Network Security Lab The Department of Electrical and Computer Engineering University of Washington SeattleWA98195-2500 United States The Department of Mathematics University of Padua Via Trieste 63 Padua35121 Italy

Dynamic wireless power transfer provides means for charging Electric Vehicles (EVs) while driving, avoiding stopping for charging and hence fostering their widespread adoption. Researchers devoted much effort over the last decade to provide a reliable infrastructure for potential users to improve comfort and time management. Due to the severe security and performance system requirements, the different scheme proposed in last years lack of a unified protocol involving the modern architecture model with merged authentication and billing processes. Furthermore, they require the continuous interaction of the trusted entity during the process, increasing the delay for the communication and reducing security due to the large number of message exchanges. In this paper, we propose a secure, computationally lightweight, unified protocol for fast authentication and billing that provides on-demand dynamic charging to comprehensively deal with all the computational and security constraints. The protocol employs an ID-based public encryption scheme to manage mutual authentication and pseudonyms to preserve the user’s identity across multiple charging processes. Compared to state-of-the-art authentication protocols, our proposal overcomes the problem of overwhelming interactions and provides public scheme security against the use of simple operations in wide open communications without impacting on performance. © 2022, CC BY-NC-ND.

关键词： Authentication

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Integrating Sensing, Communication, and Computation in the Sky

Integrating Sensing, Communication, and Computation in the S...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Yao Tang Guangxu Zhu Wei Xu Man Hon Cheung Tat-Ming Lok Shuguang Cui Department of Information Engineering The Chinese University of Hong Kong Hong Kong Shenzhen Research Institute of Big Data Shenzhen China Peng Cheng Laboratory Shenzhen China National Mobile Communications Research Lab Southeast University Nanjing China Department of Computer Science City University of Hong Kong Hong Kong School of Science and Engineering (SSE) Future Network of Intelligence Institute (FNii) The Chinese University of Hong Kong (Shenzhen) Shenzhen China

Unmanned Aerial Vehicle (UAV)-mounted edge devices are particularly advantageous for federated edge learning (FEEL) due to their flexibility and mobility in efficient data collection. In UAV-assisted FEEL, sensing, computation, and communication are coupled and compete for limited onboard resources, and UAV deployment also affects sensing and communication performance. Therefore, the joint design of UAV deployment and resource allocation is crucial to achieving the optimal training performance. In this paper, we address the problem of joint UAV deployment design and resource allocation for FEEL via a concrete case study of human motion recognition based on wireless sensing. Due to the nonideal sensing channels, we consider the probabilistic sensing model. Then, we derive the upper bound of the FEEL training loss as a function of the sensing probability. We formulate a training time minimization problem by jointly optimizing UAV deployment, integrated sensing, computation, and communication (ISCC) resources under a desirable optimality gap constraint. To solve this challenging mixed-integer non-convex problem, we propose our algorithm based on the alternating optimization technique. Simulation results demonstrate that our algorithm outperforms other baselines regarding convergence rate and testing accuracy.

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Performance Optimization for Intelligent Reflecting Surface Assisted Multicast MIMO networks

Performance Optimization for Intelligent Reflecting Surface ...

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GLOBECOM 2022 - 2022 IEEE Global Communications Conference

作者： Songling Zhang Zhaohui Yang Mingzhe Chen Danpu Liu Kai-Kit Wong H. Vincent Poor Beijing Laboratory of Advanced Information Network Beijing University of Posts and Telecommunications Beijing China Zhejiang University Hangzhou China Zhejiang Lab Hangzhou China Department of Electrical and Computer Engineering and Institute for Data Science and Computing University of Miami Coral Gables FL USA Department of Electronic and Electrical Engineering University College London London UK Department of Electrical and Computer Engineering Princeton University Princeton NJ USA

ISBN: (纸本)9781665435413

In this paper, the problem of maximizing the sum rate of all users in an intelligent reflecting surface (IRS)-assisted millimeter wave multicast multiple-input multiple-output communication system is studied. In the considered model, one IRS is deployed to assist the communication from a multi-antenna base station (BS) to the multi-antenna users that are clustered into several groups. Our goal is to maximize the sum rate of all users by jointly optimizing the transmit beamforming matrices of the BS, the receive beamforming matrices of the users, and the phase shifts of the IRS. To solve this non-convex problem, we first use a block diagonalization method to represent the beamforming matrices of the BS and the users by the phase shifts of the IRS. Then, substituting the expressions of the beamforming matrices of the BS and the users, the original sum-rate maximization problem can be transformed into a problem that only needs to optimize the phase shifts of the IRS. To solve the transformed problem, a manifold method is used. Simulation results show that the proposed scheme can achieve up to 13.3 % gain in terms of the sum rate of all users compared to the algorithm that optimizes the hybrid beamforming matrices of the BS and the users using our proposed scheme and randomly determines the phase shifts of the IRS.

关键词： Manifolds Multicast algorithms Array signal processing Surface waves Simulation Performance gain Matrices

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A Microwave Photonic Multiple Frequency System with Tunable Frequency Multiplication Factor of 3-10 19

A Microwave Photonic Multiple Frequency System with Tunable ...

引用

19th International Conference on Optical Communications and networks, ICOCN 2021

作者： Chen, Zhijia Yin, Feifei Wan, Xin Dai, Yitang Xu, Kun State Key Laboratory of Information Photonics and Optical Communication Department of Electronic Engineering Beijing University of Posts and Telecommunications 100876 China National Computer Network Emergency Response Technical Team Coordination Center of China Beijing100029 China

ISBN: (纸本)9781665424462

A microwave photonic system with a tunable frequency multiplication factor of 3-10 is theoretically analyzed and simulated. The system mainly consists of three dual-parallel Mach-Zehnder modulators (DPMZM). With the use of programmable filter, a fixed-order optical sideband can be accurately obtained as a carrier for secondary modulation. By adjusting the parameters such as the direct current (DC) bias voltage and the radio frequency (RF) drive voltage of each DPMZM in the system, microwave signals with a frequency multiplication factor of 3-10 can be generated. The simulation results show that when the frequency of RF signal is 10GHz, microwave signals with frequencies of 30, 40, 50, 60, 70, 80, 90, 100GHz can be generated with an unwanted harmonic suppression ratio of 20dB. During the frequency multiplication process, the overlap of the signal in the frequency domain is well avoided because of combining an optical programmable filter. In addition, the process of multi-frequency signal generation is theoretically derived, and the effects of several non-ideal factors on the radio frequency spurious suppression ratio (RFSSR) are analyzed. © 2021 IEEE.

关键词： Microwave photonics

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