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Your search keyword '"Yu, Jiadong"' showing total 16 results
Start Over Author "Yu, Jiadong" Publisher institute of electrical and electronics engineers (ieee)
16 results on '"Yu, Jiadong"'

3. IRS Assisted NOMA Aided Mobile Edge Computing with Queue Stability: Heterogeneous Multi-Agent Reinforcement Learning

Author

Yu, Jiadong, Li, Yang, Liu, Xiaolan, Sun, Bo, Wu, Yuan, Tsang, Hin Kwok, Yu, Jiadong, Li, Yang, Liu, Xiaolan, Sun, Bo, Wu, Yuan, and Tsang, Hin Kwok

Abstract

By employing powerful edge servers for data processing, mobile edge computing (MEC) has been recognized as a promising technology to support emerging computation-intensive applications. Besides, non-orthogonal multiple access (NOMA)-aided MEC system can further enhance the spectral efficiency with massive tasks offloading. However, with more dynamic devices brought online and the uncontrollable stochastic channel environment, it is even desirable to deploy appealing technique, i.e., intelligent reflecting surfaces (IRS), in the MEC system to flexibly tune the communication environment and improve the system energy efficiency. In this paper, we investigate the joint offloading, communication and computation resource allocation for the IRS-assisted NOMA MEC system. We first formulate a mixed integer energy efficiency maximization problem with system queue stability constraint. We then propose the Lyapunov-function-based Mixed Integer Deep Deterministic Policy Gradient (LMIDDPG) algorithm which is based on the centralized reinforcement learning (RL) framework. To be specific, we design the mixed integer action space mapping which contains both continuous mapping and integer mapping. Moreover, the award function is defined as the upper-bound of the Lyapunov drift-plus-penalty function. To enable end devices (EDs) to choose actions independently at the execution stage, we further propose the Heterogeneous Multi-agent LMIDDPG (HMA-LMIDDPG) algorithm based on distributed RL framework with homogeneous EDs and heterogeneous base station (BS) as heterogeneous multi-agent. Numerical results show that our proposed algorithms can achieve superior energy efficiency performance to the benchmark algorithms while maintaining the queue stability. Specially, the distributed structure HMA-LMIDDPG can acquire more energy efficiency gain than the centralized structure LMIDDPG.

Published
2023

7. D-Band MUTC Photodiodes With Flat Frequency Response

Author

Chao, Enfei, primary, Xiong, Bing, additional, Sun, Changzheng, additional, Hao, Zhibiao, additional, Wang, Jian, additional, Wang, Lai, additional, Han, Yanjun, additional, Li, Hongtao, additional, Yu, Jiadong, additional, and Luo, Yi, additional

Published
2022
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10. Lifetime Enhancement of a Circulated Cooling Perovskite Quantum Dots Colloidal Solution System for Laser Illuminations

Author

Yong Tang, Yu-Ling Hu, Xinrui Ding, Yu Jiadong, Tang Xueting, Binhai Yu, Bin Liu, and Zongtao Li

Subjects
Materials science, Thermoelectric cooling, General Computer Science, Peristaltic pump, 01 natural sciences, law.invention, 010309 optics, law, 0103 physical sciences, Circulating, General Materials Science, Perovskite (structure), 010302 applied physics, Quenching, business.industry, General Engineering, Laser, laser, Flow velocity, Peltier cooler, Quantum dot, Optoelectronics, perovskite quantum dots colloidal solution, lcsh:Electrical engineering. Electronics. Nuclear engineering, business, lcsh:TK1-9971, Excitation
Abstract

Perovskite quantum dots (QDs) attracted a lot of attention recently due to their high light conversion efficiency, and high color purity. However, perovskite materials are sensitive to heat. High temperature will cause serious quenching problem of the perovskite QDs. In order to solve the QDs thermal quenching problem without destroying their optical characters. A circulating quantum dots colloidal solution converter (CQD-converter) was developed. A closed loop pump tube coated with Teflon was utilized to prevent perovskite QDs from the external environment. A peristaltic pump was utilized to drive the QDs colloidal solution through a Peltier cooler for dissipating the heat of the QDs colloidal solution. The lifetime of the perovskite QDs can be significantly improved under a 450nm laser excitation. The effects of temperature of the Peltier cooler and flow velocity on the optical properties of QDs were also investigated. Compared to the static quantum dots colloidal solution (SQD-converter), which quenched after 7 min, the optical properties were maintained after 600 min for the CQD-converter.

Published
2019

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