Browsing by Author "Xu, H."
Now showing items 1-14 of 14
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Article
Adaptive control for a class of large scale non-linear systems
Xu, H.; Ioannou, Petros A.; Mirmirani, M. D. (2005)The design of stabilizing controllers for multi-input multi-output (MIMO) non-linear plants with unknown non-linearities is a challenging problem. The inability to identify the non-linearities on-line or off-line accurately ...
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Article
Adaptive sliding mode control design for a hypersonic flight vehicle
Xu, H.; Mirmirani, M. D.; Ioannou, Petros A. (2004)A multi-input/multi-output adaptive sliding controller is designed and analyzed for the longitudinal dynamics of a generic hypersonic air vehicle. This vehicle model is nonlinear, multivariable, and unstable and includes ...
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Conference Object
Adaptive sliding mode control of a hypersonic flight vehicle
Xu, H.; Leung, P.; Mirmirani, M.; Boussalis, Helen R.; Ioannou, Petros A. (2001)A Multi Input Multi Output (MIMO) adaptive sliding controller is designed and analyzed for the longitudinal dynamics of a generic hypersonic air vehicle. This vehicle model is highly nonlinear, multivariable, unstable and ...
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Article
Black cohosh (Cimicifuga racemosa L.) protects against menadione-induced DNA damage through scavenging of reactive oxygen species: Bioassay-directed isolation and characterization of active principles
Burdette, J. E.; Chen, S. -N; Lu, Z. -Z; Xu, H.; White, B. E. P.; Fabricant, D. S.; Liu, J.; Fong, H. H. S.; Farnsworth, N. R.; Constantinou, Andreas I.; Van Breemen, R. B.; Pezzuto, J. M.; Bolton, J. L. (2002)The roots/rhizomes of Cimicifuga racemosa L. (Nutt.) (black cohosh) have traditionally been used to treat menopausal symptoms through an unknown mechanism of action. In an effort to determine if black cohosh had additional ...
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Article
Evaluation of estrogenic activity of plant extracts for the potential treatment of menopausal symptoms
Liu, J.; Burdette, J. E.; Xu, H.; Gu, C.; Van Breemen, R. B.; Bhat, K. P. L.; Booth, N.; Constantinou, Andreas I.; Pezzuto, J. M.; Fong, H. H. S.; Farnsworth, N. R.; Bolton, J. L. (2001)Eight botanical preparations that are commonly used for the treatment of menopausal symptoms were tested for estrogenic activity. Methanol extracts of red clover (Trifolium pratense L.), chasteberry (Vitex agnus-castus ...
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Article
Identification and high bandwidth control of hard disk drive servo systems based on sampled data measurements
Ioannou, Petros A.; Xu, H.; Fidan, B. (2007)One of the key factors that determines the track density of a hard disk drive (HDD) is the performance characteristics of the HDD servo system, the control system that positions the READ/WRITE magnetic head close to the ...
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Article
A preliminary RAPD-PCR analysis of Cimicifuga species and other botanicals used for women's health
Xu, H.; Fabricant, D. S.; Piersen, C. E.; Bolton, J. L.; Pezzuto, J. M.; Fong, H.; Totura, S.; Farnsworth, N. R.; Constantinou, Andreas I. (2002)Traditional taxonomic methods of botanical identification that rely primarily on morphological observations cannot be used efficiently when only powdered plant materials are available. Thus, our objectives were to determine ...
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Conference Object
Robust adaptive control for a class of mimo nonlinear systems
Xu, H.; Ioannou, Petros A. (2002)The design of stabilizing controllers for nonlinear plants with unknown nonlinearities is a challenging problem. The inability to identify the nonlinearities on-line or off-line accurately motivates the design of stabilizing ...
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Article
Robust adaptive control for a class of MIMO nonlinear systems with guaranteed error bounds
Xu, H.; Ioannou, Petros A. (2003)The design of stabilizing controllers for multiple-input-multiple-output (MIMO) nonlinear plants with unknown nonlinearities is a challenging problem. The high dimensionality coupled with the inability to identify the ...
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Conference Object
Robust adaptive control of linearizable nonlinear single input systems
Xu, H.; Ioannou, Petros A. (IFAC Secretariat, 2002)In this paper a nonlinear robust adaptive control algorithm is designed and analyzed for a class of single-input nonlinear systems with unknown nonlinearities. The controller guarantees closed loop semiglobal stability and ...
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Article
Robust adaptive control of linearizable nonlinear single input systems with guaranteed error bounds
Xu, H.; Ioannou, Petros A. (2004)In this paper, a nonlinear robust adaptive control algorithm is designed and analyzed for a class of single-input nonlinear systems with unknown nonlinearities. The controller employs a single layer neural network to ...
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Conference Object
Robust adaptive sliding control of linearizable systems
Xu, H.; Mirmirani, M.; Ioannou, Petros A.; Boussalis, Helen R. (2001)A switching adaptive control algorithm based on a sliding mode method is proposed for a class of single-input, single-output nonlinear systems with unknown dynamics. The plant is assumed to be linear-in-the-control input ...
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Conference Object
Robust neural adaptive control of a hypersonic aircraft
Xu, H.; Mirmirani, M.; Ioannou, Petros A. (2003)Design of a robust Multi Input Multi Output (MIMO) neural adaptive controller for the longitudinal dynamics of a generic hypersonic aircraft is presented. This aircraft model is highly nonlinear, multivariable, unstable ...
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Conference Object
Servo Control Design for a Hard Disk Drive Based on Estimated Head Position at High Sampling Rates
Ioannou, Petros A.; Xu, H.; Fidan, B. (2003)In this paper we use the ACORN estimator that generates estimates of the head position by processing servo burst and data sector measurements of the mean square error (MSE), to provide head position error measurements at ...