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IEEE Conference on Vehicular technology (VTC)

作者： Lijun Yang Haitao Lu Xinchao Ge Zhixin Sun Pan Cao School of Internet of Things Nanjing University of Posts and Telecommunications Nanjing China RAN System Design Dept. ZTE Corporation Shenzhen China Shenzhen Key Laboratory of 5G RAN Security Technology Research and Application Shenzhen China School of Modern Posts Nanjing University of Posts and Telecommunications Nanjing China School of Physics Engineering and Computer Science University of Hertfordshire Hatfield UK

A better understanding of the mmWave channel coherence time will play a significant role in both communication and sensing. Traditional literatures consider that the channel coherence time in mmWave communication will be very short due to high frequency, which makes the channel estimation more difficult. However, we believe that the propagation characteristics of the mmWave channel will affect its coherence time, i.e., channel sparsity may limit its time variability. In this paper, we investigate the time-varying nature of mmWave channel by analyzing its Doppler spread based on the clustered sparsity model. After the derivation of Doppler spectrum DPS and the simulation analysis based on the two-cluster channel, we found that the maximum angle between clusters and the power distribution between clusters are two main factors limiting the Doppler spread. Finally, the realistic mmWave NYUSIM model is used for Doppler spread comparative analysis with Clarke’s model and find that Doppler spread of NYUSIM channel is far less than that estimated based on Clarke’s model. Thus, it is demonstrated that even if the mmWave frequency is high, the clustered sparsity characteristics makes its channel coherence time not as short as thought intuitively, which is meaningful for mmWave vehicular sensing and communication.

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The Age of Generative AI and AI-Generated Everything

arXiv

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arXiv 2023年

作者： Du, Hongyang Niyato, Dusit Kang, Jiawen Xiong, Zehui Zhang, Ping Cui, Shuguang Shen, Xuemin Mao, Shiwen Han, Zhu Jamalipour, Abbas Vincent Poor, H. Kim, Dong In School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China Chinese University of Hong Kong Shenzhen China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering Auburn University AuburnAL36849-5201 United States Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of

Generative AI (GAI) has emerged as a significant advancement in artificial intelligence, renowned for its language and image generation capabilities. This paper presents "AIGenerated Everything" (AIGX), a concept that extends GAI beyond mere content creation to real-time adaptation and control across diverse technological domains. In networking, AIGX collaborates closely with physical, data link, network, and application layers to enhance real-time network management that responds to various system and service settings as well as application and user requirements. Networks, in return, serve as crucial components in further AIGX capability optimization through the AIGX lifecycle, i.e., data collection, distributed pre-training, and rapid decision-making, thereby establishing a mutually enhancing interplay. Moreover, we offer an in-depth case study focused on power allocation to illustrate the interdependence between AIGX and networking systems. Through this exploration, the article analyzes the significant role of GAI for networking, clarifies the ways networks augment AIGX functionalities, and underscores the virtuous interactive cycle they form. This article paves the way for subsequent future research aimed at fully unlocking the potential of GAI and networks. © 2023, CC BY.

关键词： Decision making

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Surface state induced velocity transition for layered carbon nanotube films under transverse penetration loading

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Composite Structures 2025年 369卷

作者： Wang, Pengfei Wang, Wenshuai Tian, Jie Song, Zhenhua Xu, Songlin CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China Department of Aeronautics and Astronautics College of Intelligent Robotics and Advanced Manufacturing Fudan University Shanghai200433 China Engineering and Materials Science Experiment Center University of Science and Technology of China Hefei230027 China

Carbon nanotube (CNT) films, consisting of entangled two-dimensional networks, exhibit prominent surface-dependent characteristics. Lubricants have been recognized as an effective strategy for reducing interfacial friction. However, experimental evidence indicates that lubricants unexpectedly increased the interfacial friction, demonstrating a counterintuitive velocity-dependent behavior. To elucidate the anomalous interfacial dynamics, experimental and computational methodologies were employed to systematically investigate the transverse penetrating behaviors of CNT films with different interface states and loading velocities. Experimental results indicate that the lubricant exhibits a decreasing trend at lower relative velocities, but transitions from decreasing to strengthening behavior as penetration velocity increases. The proposed equation reveals that the strengthening mechanism is not solely velocity-dependent but is jointly governed by the load magnitude and surface conditions. The high specific surface area of CNT films induces enhanced interface states and pronounced velocity-dependent characteristics, which collectively govern the fracture pattern observed in films subjected to distinct surface stress conditions. Deciphering the lubricant-induced velocity-transition mechanisms in CNT films yields new theoretical insights into interface-governed penetration behavior, while establishing material design principles for engineering impact-resistant membranes with tunable energy dissipation pathways. © 2025 Elsevier Ltd

关键词： Carbon films

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Empirical prediction of noise from subsonic single-stream jets using the concept of two broadband components 49

Empirical prediction of noise from subsonic single-stream je...

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49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020

作者： Lee, Incheol Zhang, Yingzhe Lin, Dakai Beijing Aircraft Technology Research Institute of Commercial Aircraft Corporation of China Ltd Beijing Key Laboratory of Simulation Technology for Civil Aircraft Design Future Science Park Changping District Xiaotangshan Beijing102211 China School of Aeronautic Science and Engineering Beihang University No. 37 Xueyuan Road Haidian District Beijing100191 China

ISBN: (纸本)9788994021362

A comprehensive database of noise from subsonic single-stream jets was acquired at various nozzle-operating conditions. The measured spectra were normalized with the concept of one velocity exponent and two velocity exponents. When the spectra were normalized with one velocity exponent, at aft angles, a noticeable scatter of spectra is observed if the Strouhal number is less than 0.5. Based on this observation, the Strouhal number of 0.5 is set to a reference for the calculation of two velocity exponents. The scatter at the Strouhal number smaller than 0.5 disappeared in the results of two velocity exponents. A new empirical method for the prediction of noise from single-stream jets is proposed based on the spectra normalized with two velocity exponents. The velocity exponent of the low Strouhal number region is used to scale the normalized spectra of the large-scale component, and the velocity exponent of the high Strouhal number region is used to scale the spectra of the fine-scale component. The prediction is in good agreement with the experimental data. The new concept of two velocity exponents provides excellent prediction capability of noise from subsonic single-stream jets. It will be extended to the prediction of noise from subsonic coaxial-stream jets. © Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.

关键词： Velocity

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Empirical prediction of noise from subsonic dual-stream jets using the concept of two components of single-stream jet noise 49

Empirical prediction of noise from subsonic dual-stream jets...

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49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020

ISBN: (纸本)9788994021362

A new empirical method for the prediction of noise from a subsonic coaxial-stream jet is proposed. The new prediction defines that the spectra of a coaxial-stream jet consist of three sources, the primary, secondary, and mixed jet sources. The single-jet prediction, based on the concept of two components, the fine-scale and large-scale components, was applied to each source. Thus, coaxial-stream jet noise could have six potential components, two components from each source. Among them, three components were selected for the prediction of subsonic coaxial-stream jet noise: the large-scale primary, the large-scale secondary, and the fine-scale mixed components. An adjusted diameter is adopted on the primary component for the proper consideration of the peak shift at aft angles. There is an excellent spectral agreement between the prediction and static model-scale data at all angles and frequencies over a wide range of BPR up to 20 and the velocity ratio from 0.57 to 1.14. It can be concluded that the new method can be applied for the prediction of jet noise from high-bypass-ratio turbofan engines of the current and next generation without arbitrary filter function for the adjustment of the contribution of three components. © Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.

关键词： Forecasting

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Research on the Air Infiltration under Thermal Pressure in Megatall Buildings 11th

Research on the Air Infiltration under Thermal Pressure in M...

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11th International Symposium on Heating, Ventilation and Air Conditioning, ISHVAC 2019

作者： Xue, Junwei Cao, Junliang Man, Xiaoxin Han, Zhitao Liu, Jing School of Civil Engineering Northeast Forestry University Harbin150040 China School of Architecture Harbin Institute of Technology Harbin150090 China China Construction Engineering Design Group Corporation Limited Beijing100037 China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology Harbin150090 China

ISBN: (纸本)9789811395277

The rapid growth of population has promoted the construction of the megatall buildings taller than 600 m whose height might bring new issues to the building energy saving. To investigate the effect of the building height on the distribution of thermal pressure in megatall buildings, we simulated the thermal pressure distribution and air infiltration using the multi-zone network model CONTAMNv3.2. The building models were set up considering the typical conditions with height interval of 200 m ranging from 600 to 1000 m, and the outdoor meteorological parameters were set up based on the temperature ranges according to the cold region and the sever cold region in China. It is revealed that the thermal pressure increases with the increase in the building height, together with the decrease in the outdoor temperature. Besides, the energy consumptions from the air infiltrations were calculated based on the same conditions, among which the variation of air density was considered. The findings can be exploited to reduce the energy consumption of air infiltration in the megatall buildings. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Energy utilization

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On symmetry breaking of Allen–Cahn

arXiv

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arXiv 2021年

作者： Li, Dong Quan, Chaoyu Tang, Tao Yang, Wen Department of Mathematics the Hong Kong University of Science & Technology Clear Water Bay Kowloon Hong Kong SUSTech International Center for Mathematics Southern University of Science and Technology Shenzhen China Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen China Division of Science and Technology BNU-HKBU United International College Zhuhai China Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences P.O. Box 71010 Wuhan430071 China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China

This paper is concerned with numerical solutions for the Allen-Cahn equation with standard double well potential and periodic boundary conditions. Surprisingly it is found that using standard numerical discretizations with high precision computational solutions may converge to completely incorrect steady states. This happens for very smooth initial data and state-of-the-art algorithms. We analyze this phenomenon and showcase the resolution of this problem by a new symmetry-preserving filter technique. We develop a new theoretical framework and rigorously prove the convergence to steady states for the filtered solutions. Copyright © 2021, The Authors. All rights reserved.

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Soot volume fraction measurements in aero-engine model combustor outlet using two-color laserinduced incandescence

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Chinese Journal of Aeronautics 2025年第3期 253-265页

作者： Linsen WANG Pengji DING Sijie YAN Jie LI Jingwei Zhang Chaozong WANG Zhibo CAO Quan ZHOU Jinhe MU Gang Meng Wenyan SONG Zhenyu XU Bo Yan Shuang CHEN State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center Facility Design and Instrumentation Institute China Aerodynamics Research and Development Center School of Nuclear Science and Technology Lanzhou University School of Power and Energy Northwestern Polytechnical University AECC Commercial Aircraft Engine Co.Ltd. Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Quantitative measurement of Soot Volume Fraction(SVF) is an essential prerequisite for controlling soot particle emissions from aero-engine combustors. As an in-situ and non-intrusive optical diagnostic technique, Laser-Induced Incandescence(LⅡ) has been increasingly applied for soot concentration quantification in various combustion environments such as laminar flame, vehicle exhaust, internal combustion chamber as well as aero-engine combustor. In this work, we experimentally measured the spatial and temporal distribution of SVF using two-color LⅡ technique at the outlet of a single-sector dual-swirl aero-engine model combustor. The effect of inlet pressure and air preheat temperature on the SVF distribution was separately investigated within a pressure range of 241–425 k Pa and a temperature range of 292–500 K. The results show that soot production increases with the inlet pressure but generally decreases with the air preheat temperature. Qualitative analysis was provided to explain the above results of parametric studies. The LⅡ experiments were also conducted under 3 designed conditions to evaluate soot emission under practical operations. Particularly, weak soot emission was detected at the outlet under the idle *** experimental results provide a valuable benchmark for evaluating soot emission in the exhaust plume of this aero-engine combustor during practical operations.

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Correction: Effect of indentation rate on deformation behavior and mechanical properties of FeO/Fe is simulated based on molecular dynamics

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Applied Physics A 2023年第4期129卷 1-1页

作者： Fan, Mingyang Zhou, Cunlong Duan, Jingjing Gong, Jianxiong Jiang, Zhengyi College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan China Shan Xi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology Taiyuan University of Science and Technology Taiyuan China School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong Australia

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Sensitivity-Analysis-Based Reliability Enhancement for Networked Control Systems

Sensitivity-Analysis-Based Reliability Enhancement for Netwo...

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System Reliability and Safety Engineering (SRSE), International Conference on

作者： Ying Gao Qiang Dong Mo Tao Wei Zheng Zhiwu Ke Yi Feng School of Reliability and Systems Engineering Beihang University Beijing China Science and Technology on Thermal Energy and Power Laboratory Wuhan China Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9781665401616

Aiming at improving the reliability of networked control systems, this paper first investigates the three types of redundancy methods, including dynamic, static and hybrid redundancy. A sensitivity-analysis-based reliability enhancement method is proposed for networked control systems. Using this method, the key components affecting the system reliability can be found through the reliability sensitivity analysis. The reliability sensitivity analysis result illustrates which components need to be improved first, and either static redundancy, dynamic redundancy or hybrid redundancy can be used to improve the reliability of the networked control system. Finally, a double loop networked control system is used as a case to verify the effect of our method. The static redundancy method is applied on those components which are more sensitive to the system reliability, and the system reliability is effectively improved.

关键词： Networked control systems Sensitivity analysis Redundancy Reliability engineering Safety Reliability

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