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AN ENVIRONMENT MODELING METHOD OF AUTONOMOUS UNDERWATER VEHICLE`S 3-D PATH-PLANNING
Qiang, Hua Ke,Ming, Li Xiu 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
Path-planning is the key technique of autonomous underwater vehicle(AUV). The estibalishment of ocean environment model is one of it's difficulties. we present a new method of underwater world modeling in the technique problem of deciding and controlling the AUV's movement. The method describes the underwater world from different levels; geometrical model, topological mode land semantic model. Among them, topological model uses the technique of implicit graph and solves the problem of representation of large state-space in 3-D environment effectively. The application in path-planning indicate that the method has the advantages of describing underwater's complex and varible terrian objectly and effectively and being processed efficiently in computer.
Lyapunov-based States Transfer for Open System with Superconducting Qubits
Ying-Hua Ji,Ju-Ju Hu,Qiang Ke 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1
We design control fields to realize states transfer for open quantum system by Lyapunov stability theory, and investigate the states transfer of superconducting qubits in Markovian channels with phase relaxation and energy dissipative relaxation. The numerical simulations indicate that arbitrary state (eigenstate, superposition state or mixed state) transfer and maintenance for Markovian system can be realized under Lyapunov control function by an external steady control field of proper amplitude. Moreover, proper increase of proportional coefficients can accelerate the qubits flip and reduce the vibration frequency of control function.
Perfect Manipulation of Open Stochastic Quantum Systems with Imperfect Detection
Ju-Ju Hu,Qiang Ke,Ying-Hua Ji 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.3
Utilizing the homodyne-based feedback control, this paper studies the influence of quantum detection efficiency on the state transfer control of open quantum systems. Under steady state, we give the relations between the feedback control coefficient, detection efficiency and measurement strength. On this basis, we investigate the state transfer under three typical categories of noise: depolarizing channel, amplitude damping channel and phase damping channel in detail. Moreover, we proposed the control strategy which can completely manipulate the stochastic quantum system from an arbitrary initial state to the target eigenstate with fast convergence for the lower or larger detection efficiency in the absence of additional control. We also find that the state transfer of the system can be realized by no-knowledge quantum feedback. Numerical simulation experiments further verify the control scheme can be extended to multi-quantum bit systems.