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Event-trigger Optimal Consensus for Multi-agent System Subject to Differential Privacy
Tao Dong,Huiyun Zhu,Wenjie Hu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.9
Optimal consensus algorithm is a very useful consensus algorithm for distributed cooperative control, which makes all the agents not only achieve consensus but also minimize the cost function. However, to achieve consensus, agents need to exchange their state with each other on public channel. If attackers want to obtain the privacy information of agents, they only need to monitor the public channel. To solve this problem, a novel eventtriggered differentially privacy optimal consensus algorithm is proposed to preserve the privacy of the cost function of each agent in the whole process of consensus computation. Based on event-trigger condition, we analyze the consensus of our algorithm in detail, including the accuracy and consensus conditions. In addition, the privacypreserving analysis are also given, which exhibits that privacy of the states of all agents can be preserved. The privacy level and the sensitivity of the differential privacy are also obtained. Finally, a numerical simulation is givento illustrate the effectiveness of the theoretical results.
Event-triggered Consensus of Discrete Time Second-order Multi-agent Network
Daduan Zhao,Tao Dong,Wenjie Hu 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1
This paper is concerned with the event-triggered consensus problem of discrete time second-order multiagent network. First, a novel distributed discrete time event-triggered scheme is proposed. The controller is updated only at the errors of the state and velocities exceed the threshold. Then, by using bilinear transformation technique, the integral inequality technique and matrix theory, some sufficient conditions for the consensus of multi-agent network are obtained. Different from existing works, our conditions reveal how the Laplacian matrix eigenvalues and scaling strengths affect the consensus of discrete time second-order multi-agent network with event-based control strategy. Moreover, the Zeno-like behavior of triggering time sequences is excluded. Finally, a numerical simulation is provided to illustrate the correctness of theoretical results.
Design of HUST-PTF beamline control system for fast energy changing
Li Peilun,Li Dong,Qin Bin,Zhou Chong,Han Wenjie,Liao Yicheng,Chen Aote 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
A proton therapy facility is under development at Huazhong University of Science and Technology (HUST). To meet the need for fast energy changes during treatments, a beamline control system (BCS) has been designed and implemented. The BCS coordinates and controls various beamline devices by adopting a distributed architecture divided into three layers: the client, server, and device layers. Among these, the design of the server layer is the key to realize fast energy changes. The server layer adopts the submodule programming paradigm and optimizes the data interface among modules, allowing the main workflow to be separated from the device workflow and data. Furthermore, this layer uses asynchronous, multithreaded, and thread-locking methods to improve the system's ability to operation efficiently and securely. Notably, to evaluate the changing energy status over time, a dynamic node update method is adopted, which can dynamically adjust the update frequency of variable nodes. This method not only meets the demand for fast updates on energy changes but also reduces the server's communication load in the steady state. This method is tested on a virtual platform, and the results are as expected.
Wei Lian,Yan Liu,Wenjie Wang,Yangtao Dong,Sheng Wang,Zhenying Liu,Yin Liu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
Environmentally friendly low-cost porous ceramics are prepared with 98.2 wt% mining waste as the raw materials at 1180 °C. The glass powder forms liquid phase at high temperatures, promoting the densification of the materials. X-ray diffraction (XRD) results show that the formation of mullite is affected by sintering temperature and content of liquid phase. The enhancement in densification is verified by the scanning electron microscopy (SEM) analysis results. According to the evolution of pore structure, the effect of the glass powder on the structure is confirmed. The number ratio of pores of < 8 μm to those of 8 ~ 20 μm is varied from 7:2 to 2:7. The minimum apparent porosity is 31.22 %, while the maximum density and linear shrinkage are 1.75 g/cm 3 and 8.48 %, respectively. The flexural strength (three-point bending method) was increased from 7.47 MPa to 28.36 MPa, indicating that the addition of glass powder could increase mechanical properties of the porous ceramics. Therefore, solid wastes can be used as the resource to develop porous mullite ceramics.