This paper investigates the problem of output feedback l(2) - l(infinity) control for networked system with random delays. The sensor-to-controller and controller-to-actuator delays are simultaneously considered due t...
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ISBN:
(纸本)9781424408177
This paper investigates the problem of output feedback l(2) - l(infinity) control for networked system with random delays. The sensor-to-controller and controller-to-actuator delays are simultaneously considered due to limited bandwidth communication. The random delays are described by a binary switching sequence satisfying a Bernoulli distribution. The purpose is the design of a dynamic output feedback controller which ensures the exponentially mean-square stability of the closed-loop system and guarantees an l(2) - l(infinity) norm bound constraint on disturbance attenuation. Via matrix inequalities a sufficient condition for solvability of this problem is presented. The sequentially linear programming method (SLPMM) is applied to solve the matrix inequalities. A numerical example is provided to demonstrate the validity of the proposed design approach.
Light-induced autofluorescence spectra of nasopharyngeal carcinoma and normal tissue in vitro were compared to that of known endogenous fluorophores to explore the possible causes of tissue autofluorescence and to fur...
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ISBN:
(纸本)081946080X
Light-induced autofluorescence spectra of nasopharyngeal carcinoma and normal tissue in vitro were compared to that of known endogenous fluorophores to explore the possible causes of tissue autofluorescence and to further determine the optimal excitation wavelengths for optical biopsy in vivo. Nasopharyngeal carcinoma and normal tissues were obtained from the suspected patients during pathological biopsy. A FL/FS920 combined TCSPC spectrofluorimeter and a lifetime spectrometer system was used for autofluorescence spectra measurement. Fluorescence excitation wavelengths varying from 260 to 480 nm were used to induce tissue autofluorescence, and the corresponding fluorescence emission spectra were recorded from a range starting 20 nm above the excitation wavelength and extending to 700 run. The autofluorescence excitation-emission pairs of nasopharyngeal carcinoma and normal tissues occur at 300-330, 340-460 and 450-520 nm, and the optimal diagnostic excitation wavelengths for detection of nasopharyngeal carcinoma were 340 and 450 run. The results abtained in this study could be treated as a reference for the development of optical biopsy system for nasopharyngeal carcinoma.
Measurement of excitation-emission matrices (EEMs) for nasopharyngeal carcinoma (NPC) and normal nasopharyngeal tissues in vitro was employed to determine the optimal excitation wavelengths that contain the most diagn...
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Measurement of excitation-emission matrices (EEMs) for nasopharyngeal carcinoma (NPC) and normal nasopharyngeal tissues in vitro was employed to determine the optimal excitation wavelengths that contain the most diagnostic information for optical diagnosis. Pathologically confirmed normal nasopharyngeal and NPC tissues(n=47) were obtained from 25 patients undergoing surgical biopsy. The autofluorescence EEMs of tissue biopsies were recorded with a TCSPC spectrofluorimeter. Fluorescence excitation wavelengths varied from 260 to 500 nm, and the corresponding fluorescence emission spectra were recorded from a range starting 20 nm above the excitation wavelength and extending to 700 nm. The calibration for different EEMs measurements was performed for quantitative comparison. As a result, we find that the excitation-emission pair of 340-380 nm yields the best performance for discrimination of NPC tissues with the sensitivity and specificity of 77.2% and 88.0%, respectively
An approach to design the robust PID (proportional integral derivative) controller for continuous-time system with parameter uncertainties is presented. H2 performance and H∞ performance are simultaneously considered...
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An approach to design the robust PID (proportional integral derivative) controller for continuous-time system with parameter uncertainties is presented. H2 performance and H∞ performance are simultaneously considered, and the poles of closed system should be sited in a given region. A state space parameterization method which allows to convert PID controller synthesis into LMI (linear matrix inequality) optimization problem is proposed, then the PID controller parameters can be obtained directly by solving a set of linear matrix inequalities. Numerical example is given to illustrate the design procedure and its effectiveness.
The defect of digital PIP controller is that by which time-delay system can not be effectively controlled, also the uncertain interference can not be effectively eliminated. In this paper, a class of
The defect of digital PIP controller is that by which time-delay system can not be effectively controlled, also the uncertain interference can not be effectively eliminated. In this paper, a class of
Generally, the state-transition matrix (STM) for time-variant case can not be written in a closed form or an explicit expression. An explicit or a compact expression of STM is considered for time-variant case in this ...
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Generally, the state-transition matrix (STM) for time-variant case can not be written in a closed form or an explicit expression. An explicit or a compact expression of STM is considered for time-variant case in this paper. A bounded linear operator which maps the infinite terms in STM. under some conditions, to a convergent series whose limit yields the required expression of STM is constructed.
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