Operating the Hubble space telescope : Goddard Space Flight Center : a closer look : Space Telescope Project--Goddard /

Shipping list no.: 85-926-P.

Hubble Space Telescope, new & improved.

Mode of access: Internet.

NASA Marshall Space Flight Center.

Mode of access: Internet.

Hubble Space Telescope : update : 18 months in orbit.

Cover title.

The NASA university space engineering research centers.

Mode of access: Internet.

The Combined Release and Radiation Effects Satellite Program, CRRES : a unique series of scientific experiments.

Mode of access: Internet.

Application of the fault-tolerant deadline mechanism to a satellite on-board computer system /

"June 1980."

Models of Venus atmosphere (1972) [Prepared for NASA under the cognizance of the NASA Goddard Space Flight Center.

Cover title.

NASA space communications program [microform] : hearings before the Subcommittee on Space Science and Applications of the Committee on Science and Technology, U.S. House of Representatives, Ninety-seventh Congress, first session, July 8, 9, 1981.

"No. 17."

NASA program management and procurement procedures and practices [microform] : hearings before the Subcommittee on Space Science and Applications of the Committee on Science and Technology, U.S. House of Representatives, Ninety-seventh Congress, first session, June 24, 25, 1981.

"No. 16."

Oversight--space telescope, 1982 [microform] : hearing before the Subcommittee on Space Science and Applications of the Committee on Science and Technology, U.S. House of Representatives, Ninety-seventh Congress, second session, May 24, 25, 1982.

"No. 99."

NASA authorization : hearing before the Subcommittee on Science, Technology, and Space of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundredth Congress, second session ...

"March 22, 1988"--Pt. 3.

NASA's space science and applications program : a statement presented to the Committee on Aeronautical and Space Sciences, United States Senate, April 20, 1967 /

"The material in this booklet is a reprint of a portion of that which was prepared by NASA's Office of Space Science and Applications for presentation to the Congress."

Flight Mechanics/Estimation Theory Symposium 1992 : proceedings of a symposium sponsored by NASA Goddard Space Flight Center and held at Goddard Space Flight Center, Greenbelt, Maryland, May 5-7, 1992 /

Includes bibliographical references.

Tracking the states of a nonlinear and nonstationary system in the weight-space of artificial neural networks

We propose a novel interpretation and usage of Neural Network (NN) in modeling physiological signals, which are allowed to be nonlinear and/or nonstationary. The method consists of training a NN for the k-step prediction of a physiological signal, and then examining the connection-weight-space (CWS) of the NN to extract information about the signal generator mechanism. We de. ne a novel feature, Normalized Vector Separation (gamma(ij)), to measure the separation of two arbitrary states i and j in the CWS and use it to track the state changes of the generating system. The performance of the method is examined via synthetic signals and clinical EEG. Synthetic data indicates that gamma(ij) can track the system down to a SNR of 3.5 dB. Clinical data obtained from three patients undergoing carotid endarterectomy of the brain showed that EEG could be modeled (within a root-means-squared-error of 0.01) by the proposed method, and the blood perfusion state of the brain could be monitored via gamma(ij), with small NNs having no more than 21 connection weight altogether.