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23 results on '"Yao, Xuming"'

4. Study on Energy Consumption and Coverage of Hierarchical Cooperation of Small Cell Base Stations in Heterogeneous Networks

Author

Yao, Xuming, Sun, Yingying, and Han, Tao

Subjects
Computer Science - Information Theory
Abstract

The demand for communication services in the era of intelligent terminals is unprecedented and huge. To meet such development, modern wireless communications must provide higher quality services with higher energy efficiency in terms of system capacity and quality of service (QoS), which could be achieved by the high-speed data rate, the wider coverage and the higher band utilization. In this paper, we propose a way to offload users from a macro base station(MBS) with a hierarchical distribution of small cell base stations(SBS). The connection probability is the key indicator of the implementation of the unload operation. Furthermore, we measure the service performance of the system by finding the conditional probability-coverage probability with the certain SNR threshold as the condition, that is, the probability of obtaining the minimum communication quality when the different base stations are connected to the user. Then, user-centered total energy consumption of the system is respectively obtained when the macro base station(MBS) and the small cell base stations(SBS) serve each of the users. The simulation results show that the hierarchical SBS cooperation in heterogeneous networks can provide a higher system total coverage probability for the system with a lower overall system energy consumption than MBS., Comment: 6 pages, 7 figures, accepted by ICACT2018

Published
2018

5. End to End Performance Analysis of Relay Cooperative Communication Based on Parked Cars

Author

Sun, Yingying, Wang, Lijun, Bai, Zhiquan, Kwak, Kyung Sup, Yao, Xuming, and Han, Tao

Subjects
Computer Science - Information Theory
Abstract

Parking lots (PLs) are usually full with cars. If these cars are formed into a self-organizing vehicular network, they can be new kind of road side units (RSUs) in urban area to provide communication data forwarding between mobile terminals nearby and a base station. However cars in PLs can leave at any time, which is neglected in the existing studies. In this paper, we investigate relay cooperative communication based on parked cars in PLs. Taking the impact of the car's leaving behavior into consideration, we derive the expressions of outage probability in a two-hop cooperative communication and its link capacity. Finally, the numerical results show that the impact of a car's arriving time is greater than the impact of the duration the car has parked on outage probability., Comment: 7 pages, 7 figures, accepted by ICACT2018

Published
2018

9. Ti3C2Tx MXene Nanosheet-Based Hybrid Films for Enhanced Wave Absorption-Dominated Electromagnetic Interference Shielding.

Author

Yang, Guoyu, Yao, Xuming, Li, Yujun, Hu, Yi, Chen, Xing, Li, Jialiang, Chen, Junzhen, and Jiang, Jianjun

Abstract

Owing to its excellent electronic properties, Ti3C2Tx MXene is an emerging class of two-dimensional nanomaterials that have a promising electromagnetic (EM) wave function; however, poor impedance matching has limited the application of these materials in absorption-dominated EM interference (EMI) shielding. Hence, the investigation of thin MXene nanosheet-based film materials for application to absorption-dominated EMI shielding, which produces less EM pollution than reflection-dominated EMI shielding materials, is essential. In this study, a Ti3C2Tx/carbonyl iron–aramid hybrid film possessing absorption-dominated EMI shielding properties was prepared by using flower-like core–shell Ti3C2Tx/carbonyl iron microspheres (Ti3C2Tx/CIs) and aramid nanofibers. In the X band, the EMI shielding effectiveness of the films reached 31.9 dB with a lower SER value (below 3 dB), which means that less than 50% of the reflected incident waves and secondary EM pollution were reduced by the EMI shielding film materials. These results were attributed to superior impedance matching and multiple dissipation mechanisms of the Ti3C2Tx/CIs nanocomposites, which substantially enhanced the EM-wave absorption properties of a single MXene. The experimental results indicated that Ti3C2Tx/CIs nanocomposites showed a minimum reflection loss of −50.8 dB at 7.84 GHz. Moreover, a maximum effective absorption bandwidth of 5.5 GHz (12.48–18 GHz) was obtained at 1.60 mm, almost covering the entire Ku band. Therefore, this work provides a framework for designing MXene-based absorption-dominated EMI shielding nanocomposites. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Synchronized levelling system for high efficiency composite Press

Author

Wang Wei, Cheng Shuai, Yao Xuming, and Dapeng Yang

Subjects
business.product_category, Levelling, Computer science, Control system, Hardware-in-the-loop simulation, Hydraulic machinery, business, Automotive engineering, Synchronization, Reliability (statistics), Block (data storage), Airplane
Abstract

Light composite material is applied more and more such as automobile, airplane, high speed train industry. The accuracy, efficiency and high reliability is required. One synchronized levelling system is developed, which included high performance cylinder with valve block, hydraulic power unit, de-centralized control system with synchronize algorithm. Hardware in loop system simulation method is applied. Finally, the performance is validated with real machine. This four-point levelling system improves the machine with high efficiency and good levelling effect, whose synchronization accuracy can reach less than 0.1 mm.

Published
2019

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