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Träfflista för sökning "LAR1:liu srt2:(1980-1994)"

Sökning: LAR1:liu > (1980-1994)

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21.
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24.
  • Akçay, Hüseyin, et al. (författare)
  • On the Choice of Norms in System Identification
  • 1994
  • Ingår i: Proceedings of the 10th IFAC Symposium on System Identification. - Linköping : Linköping University. - 9780080422251 ; , s. 103-108
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • In this paper we discuss smooth and sensitive norms for prediction error system identification when the disturbances are magnitude bounded. Formal conditions for sensitive norms, which give an order of magnitude faster convergence of the parameter estimate variance, are developed. However, it also is shown that the parameter estimate variance convergence rate of sensitive norms is arbitrarily bad for certain distributions. A necessary condition for a norm to be statistically robust with respect to the family F(C) of distributions with support [-C, C] for some arbitrary C>0 is that its second derivative does not vanish on the support. A direct consequence of this observation is that the quadratic norm is statistically robust among all lp-norms, p⩽2<∞ for F(C).
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25.
  • Akçay, Hüseyin, et al. (författare)
  • The Least-Squares Identification of FIR Systems Subject to Worst-Case Noise
  • 1993
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The least-squares identification of FIR systems is analyzed assuming that the noise is a bounded signal and the input signal is a pseudo-random binary sequence. A lower bound on the worst-case transfer function error shows that the lest-square estimate of the transfer function diverges as the order of the FIR system is increased. This implies that, in the presence of the worst-case noise, the trade-off between the estimation error due to the disturbance and the bias error (due to unmodeled dynamics) is significantly different from the corresponding trade-off in the random error case: with a worst-case formulation, the model complexity should not increase indefinitely as the size of the data set increases.
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26.
  • Akçay, Hüseyin, et al. (författare)
  • The Least-Squares Identification of FIR Systems Subject to Worst-Case Noise
  • 1994
  • Ingår i: Proceedings of the 10th IFAC Symposium on System Identification. - Linköping : Linköping University. - 9780080422251 ; 23:5, s. 329-338
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The least-squares identification of FIR systems is analyzed assuming that the noise is a bounded signal and the input signal is a pseudo-random binary sequence. A lower bound on the worst-case transfer function error shows that the least-square estimate of the transfer function diverges as the order of the FIR system is increased. This implies that, in the presence of the worst-case noise, the trade-off between the estimation error due to the disturbance and the bias error (due to unmodeled dynamics) is significantly different from the corresponding trade-off in the random error case: with a worst-case formulation, the model complexity should not increase indefinitely as the size of the data set increases.
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29.
  • ALCOCK, SJ, et al. (författare)
  • Continuous analyte monitoring to aid clinical practice
  • 1994
  • Ingår i: IEEE Engineering in Medicine and Biology Magazine. - : IEEE; 1999. - 0739-5175 .- 1937-4186. ; 13:3, s. 319-325
  • Tidskriftsartikel (refereegranskat)abstract
    • Considerable progress has been made in the development of practical glucose sensors for in vivo use. In some designs, the sensor can be replaced by the patient, who "injects" a new sensor into a fresh site using a hypodermic needle. An open-loop hypoglycaemia sensor providing an alarm signal could be available soon, and it would be very useful in the management of diabetes. The sensor for this application would need to function for a minimum period of about 12 hours. Further developments in the glucose sensor area are expected to lead to a comfortable implantable sensor/pump device, which would provide closed loop control for a prolonged period. An acceptable system would be a sensor replaced every 2 to 3 days, coupled with a microprocessor-controlled pump replaced after 2 to 3 years. Further engineering input is needed to design the monitoring and control unit containing the alarm and pump systems. The world market in clinical analysis is about US $6 billion, and covers about 10% of the total expenses for health care. It is in the field of continuous microsensors that future competition for the clinical diagnostic market will take place. Funding in vivo projects is less attractive to industry than the more proven and well-established area of in vitro diagnostics. However, the benefits of in vivo monitoring to the health of the community, and the financial rewards to manufacturers are ultimately great. It is clearly of interest for industry to invest in the development and commercialisation of this high added-value technology.
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30.
  • Alcock, S. J., et al. (författare)
  • Advances in the use of  in vivo sensors
  • 1992
  • Ingår i: Biosensors & bioelectronics. - : Elsevier. - 0956-5663 .- 1873-4235. ; 7:4, s. 243-254
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The sixth workshop of the European Community Concerted Action on Chemical sensors for in vivo monitoring was held at Snogeholm, Sweden, in October 1991. The meeting reviewed recent in vivo and ex vivo results, and also included a shorter session on ethical and safety problems.
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