Blind System Identification of Noncoprime Multichannel Systems and Its Application to Noninvasive Cardiovascular Monitoring

[+] Author and Article Information
Yi Zhang

Guidant Corporation St. Paul, MN 55112

H. Harry Asada

Alex d’Arbeloff Laboratory for Information Systems and Technology, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Dyn. Sys., Meas., Control 126(4), 834-847 (Mar 11, 2005) (14 pages) doi:10.1115/1.1852460 History: Received February 28, 2003; Revised January 03, 2004; Online March 11, 2005
Copyright © 2004 by ASME
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Schematic of a multichannel system
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Anatomy of the systemic circulatory system
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Topological structure of the systemic circulatory system analogous to a multichannel system
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An all-zero system formulated to (a) solve the zero locations of a pole-zero system; (b) solve the pole locations of a pole-zero system
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Multichannels having common dynamics (a) and ones with distinct channel dynamics driven by filtered input (b)
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Formulation of the MBSI problem when common dynamics are present
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Distinct channel dynamics Case 1: (a) Estimated versus real roots of channel 1; (b) estimated versus real roots of channel 2; (c) singular values of matrix Y in descending order; (d) estimated versus real impulse responses
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Distinct channel dynamics Case 2: (a) Estimated versus real roots of channel 1; (b) estimated versus real roots of channel 2; (c) overlay of channels 1 and 2; (d) singular values of matrix Y in descending order
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Aortic flow (a) and pressure signals (b) generated by distributed cardiovascular simulator and (c) the impulse responses from aortic flow to peripheral pressure
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IIID test results for linearized cardiovascular system: (a) pole-zero location: true versus estimated; (b) three-channel outputs; and (c) estimated versus real inputs comparison when model structure is known
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Comparison of estimated (recovered) input with real input when model structure is unknown
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IIID implementation test result for a nonlinear, distributed system using cardiovascular simulator: comparison of estimated (recovered) input with real input




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