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78 results on '"Baldi, P"'

2. Adaptive FTC based on Control Allocation and Fault Accommodation for Satellite Reaction Wheels

Author

Baldi, P., Blanke, Mogens, Castaldi, P., Mimmo, N., Simani, S., Baldi, P., Blanke, Mogens, Castaldi, P., Mimmo, N., and Simani, S.

Abstract

This paper proposes an active fault tolerant control scheme to cope with faults or failures affecting the flywheel spin rate sensors or satellite reaction wheel motors. The active fault tolerant control system consists of a fault detection and diagnosis module along with a control allocation and fault accommodation module directly exploiting the on-line fault estimates. The use of the nonlinear geometric approach and radial basis function neural networks allows to obtain a precise fault isolation, independently from the knowledge of aerodynamic disturbance parameters, and to design generalised estimation filters, which do not need a priori information about the internal model of the signal to be estimated. The adaptive control allocation and sensor fault accommodation can handle both temporal faults and failures. Simulation results illustrate the convincing fault correction and attitude control performances of the proposed system.

Published
2016

20. Soft-Proton-Exchange Tapers for Low Insertion-Loss LiNbO3 Devices.

Author

Castaldini, D., Bassi, P., Tascu, S., Aschieri, P., De Micheli, M.P., and Baldi, P.

Abstract

We present the results of an experimental study of waveguide tapers realized in LiNbO3 using the soft-proton-exchange process and the waveguide segmentation technique. Measurements show that they can be favorably introduced between the nonlinear or electrooptic part of the components, which require strong mode confinement to increase efficiency, and the coupling section with a standard optical fiber, which requires low mode confinement in order to have low coupling losses. These tapers allow almost lossless mode-shape transformation. Preliminary results show that they allow reducing the coupling losses by up to 0.7 dB, thus proving the practical interest of the approach. [ABSTRACT FROM PUBLISHER]

Published
2007
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21. Functional census of mutation sequence spaces: the example of p53 cancer rescue mutants.

Author

Danziger, S.A., Swamidass, S.J., Jue Zeng, Dearth, L.R., Qiang Lu, Chen, J.H., Cheng, J., Hoang, V.P., Saigo, H., Luo, R., Baldi, P., Brachmann, R.K., and Lathrop, R.H.

Abstract

Many biomedical problems relate to mutant functional properties across a sequence space of interest, e.g., flu, cancer, and HIV. Detailed knowledge of mutant properties and function improves medical treatment and prevention. A functional census of p53 cancer rescue mutants would aid the search for cancer treatments from p53 mutant rescue. We devised a general methodology for conducting a functional census of a mutation sequence space by choosing informative mutants early. The methodology was tested in a double-blind predictive test on the functional rescue property of 71 novel putative p53 cancer rescue mutants iteratively predicted in sets of three (24 iterations). The first double-blind 15-point moving accuracy was 47 percent and the last was 86 percent; r = 0.01 before an epiphanic 16th iteration and r = 0.92 afterward. Useful mutants were chosen early (overall r = 0.80). Code and data are freely available (http://www.igb.uci.edu/research/research.html, corresponding authors: R.H.L. for computation and R.K.B. for biology) [ABSTRACT FROM PUBLISHER]

Published
2006
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