Optimal control of HIV infection with a continuously-mutating viral population Tập 5 - Trang 4033-4038 vol.5 - 2002
J.J. Kutch, P. Gurfil
There has been much discussion in recent years devoted to determining the optimal methodology for administering anti-viral medication therapies to fight HIV infection. There are many reasons to seek such an optimal therapy, including the minimization of drug toxicity and monetary cost. However, there is increasing recognition that exposure to many anti-HIV medications produces extremely rapid chan...... hiện toàn bộ
#Optimal control #Human immunodeficiency virus #Drugs #Medical treatment #Genetic mutations #Capacitive sensors #Viruses (medical) #Immune system #Medical control systems #DNA
Transition control using multiple adaptive models and an H-infinity controller design Tập 4 - Trang 2621-2626 vol.4 - 2002
Z. Tian, K.A. Hoo
By transition control, it is meant a type of control method that is employed when the plant transitions from one operating state to another as a result of a set point change. This work proposes and develops an intelligent adaptive multiple model approach that simultaneously adapts the model and an H/sub /spl infin// controller parameters. The method is demonstrated on a non-linear chemical reactor...... hiện toàn bộ
#Programmable control #Adaptive control #H infinity control #Open loop systems #Estimation error #Chemical reactors #Chemical engineering #Chemical products #Globalization #Polymers
Development of a closed-loop testing method for a next-generation terminal area automation system Tập 2 - Trang 1325-1330 vol.2 - 2002
J.E. Robinson, D.R. Isaacson
A next-generation air traffic decision support tool, known as the active final approach spacing tool (aFAST), will generate heading, speed and altitude commands to achieve more precise separation of aircraft in the terminal area. The techniques used to analyze the performance of earlier generation decision support tools are not adequate to analyze the performance of aFAST. The paper summarizes the...... hiện toàn bộ
#Automatic testing #System testing #Automation #Aircraft #Performance analysis #Air traffic control #Feedback loop #Aerospace control #Scheduling algorithm #Trajectory
Disturbance rejection for nonlinear systems Tập 5 - Trang 3484-3489 vol.5 - 2002
Zongxuan Sun, Tsu-Chin Tsao
Tracking or rejection of unknown exogenous signals with known generating dynamics is of major concern in feedback control design. Linear feedback control based on the internal model principle achieves asymptotic performance for linear systems with linear exogenous signal dynamics. This paper presents a control design based on the internal model principle to track or reject nonlinear exogenous sign...... hiện toàn bộ
#Nonlinear systems #Aerodynamics #Linear systems #Feedback control #Sufficient conditions #Control design #Regulators #Nonlinear equations #Partial differential equations #Servomechanisms
Direct RBF neural network control of a class of discrete-time non-affine nonlinear systems Tập 1 - Trang 424-429 vol.1
J. Zhang, S.S. Ge, T.H. Lee
Direct adaptive RBF NN control is presented for a class of discrete-time single-input single-output non-affine nonlinear systems. An implicit function theorem is used to prove the existence and uniqueness of the implicit desired feedback control. Based on the input-output model, RBF neural networks are used to emulate the implicit desired feedback control. The closed-loop is proven to be semi-glob...... hiện toàn bộ
#Neural networks #Nonlinear control systems #Control systems #Nonlinear systems #Feedback control #Adaptive control #Neurons #Programmable control #Computer networks #Physics computing
H/sub /spl infin// controller design for discrete-time fuzzy systems using fuzzy weighting-dependent Lyapunov functions Tập 4 - Trang 3252-3257 vol.4 - 2002
Doo Jin Choi, PooGyeon Park
For discrete-time Takagi-Sugeno (TS) fuzzy systems, we propose an H/sub /spl infin// state-feedback fuzzy controller associated with a fuzzy weighting-dependent Lyapunov function. In terms of parameterized linear matrix inequalities (PLMIs), the controller employs not only the current-time but also one-step-past information on the time-varying fuzzy weighting functions. Appropriately selecting the...... hiện toàn bộ
#Fuzzy systems #Control systems #Fuzzy control #Lyapunov method #Electric variables control #Takagi-Sugeno model #Control system synthesis #Cost function #Stability #Attenuation
Điều khiển phi tuyến thông qua theo dõi quỹ đạo tối ưu hóa Dịch bởi AI Tập 5 - Trang 3980-3985 vol.5 - 2002
E. Nagy
Bài báo này trình bày các phương pháp mới cho thiết kế hệ thống điều khiển theo thời gian rời rạc phi tuyến. Các phương pháp này dựa trên tối ưu hóa và sử dụng hoặc là phương pháp tuyến tính hóa gần đúng hoặc là các phương trình phi tuyến gốc để đạt được giải pháp một cách đồng bộ. Vấn đề tối ưu hóa điều khiển với chân trời hữu hạn được giải quyết qua chuỗi tối ưu hóa hai giai đoạn và lặp. Điều kh...... hiện toàn bộ
#Quỹ đạo
Efficient moving horizon estimation and nonlinear model predictive control Tập 6 - Trang 4475-4480 vol.6 - 2002
M.J. Tenny, J.B. Rawlings
State estimation from plant measurements should play an essential role in any advanced process control technology. Unlike the model predictive control (MPC) regulator, however, this area has received little attention. In this paper, we address the computational issues surrounding constrained moving horizon estimation (MHE) by presenting an algorithm for the efficient computation of moving horizon ...... hiện toàn bộ
#Predictive models #Predictive control #State estimation #Smoothing methods #Regulators #Costs #Filtering #Chemical engineering #Process control #Nonlinear systems
Multivariable model predictive control of processes with unstable transmission zeros Tập 5 - Trang 4189-4190 vol.5 - 2002
W. Garcia-Gabin, D. Zambrano, E.F. Camacho
This paper shows how a model predictive controller has instability problems for multivariable processes with unstable transmission zeros. The instability problems are produced by the cancellation of unstable transmission zeros, which leads to a loss of internal stability of the feedback system.
#Predictive models #Predictive control #Filtering theory #MIMO #Weight control #Stability #Frequency #Signal processing #Propagation losses #Feedback
Subriemannian geodesics and optimal control of spin systems Tập 4 - Trang 2806-2811 vol.4 - 2002
N. Khaneja, S. Glaser, R. Brockett
Nuclear Magnetic Resonance (NMR) Spectroscopy in solution is an important modality for extracting structural information of macromolecules. In NMR spectroscopy, radio frequency electromagnetic pulses axe used to manipulate spin states of atomic nuclei. Pulse sequences that accomplish a desired spin control should be as short as possible in order to minimize the effects of thermal relaxation, and t...... hiện toàn bộ
#Optimal control #Nuclear magnetic resonance #Spectroscopy #Data mining #Radio frequency #EMP radiation effects #Atomic measurements #Geophysics computing #Control system synthesis #Network synthesis