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| 2. |
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| 3. |
- Li, HB, et al.
(författare)
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Capon estimation of covariance sequences
- 1998
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Ingår i: CIRCUITS SYSTEMS AND SIGNAL PROCESSING. - : BIRKHAUSER BOSTON INC. - 0278-081X. ; 17:1, s. 29-49
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Estimating the covariance sequence of a wide-sense stationary process is of fundamental importance in digital signal processing (DSP). A new method, which makes use of Fourier inversion of the Capon spectral estimates and is referred to as the Capon metho
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| 4. |
- Li, HB, et al.
(författare)
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Computationally efficient maximum likelihood estimation of structured covariance matrices
- 1999
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Ingår i: IEEE TRANSACTIONS ON SIGNAL PROCESSING. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 1053-587X. ; 47:5, s. 1314-1323
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- By invoking the extended invariance principle (EXIP), we present herein a computationally efficient method that provides asymptotic (for large samples) maximum likelihood (AML) estimation for structured covariance matrices and will be referred to as the A
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| 5. |
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| 6. |
- Li, HB, et al.
(författare)
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Performance analysis of forward-backward matched-filterbank spectral estimators
- 1998
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Ingår i: IEEE TRANSACTIONS ON SIGNAL PROCESSING. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 1053-587X. ; 46:7, s. 1954-1966
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The problem of complex spectral estimation is of great interest in many applications. This paper studies the general class of the forward-backward matched-filterbank (MAFI) spectral estimators including the widely used Capon as well as the more recently i
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| 7. |
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| 8. |
- Stoica, P, et al.
(författare)
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A new derivation of the APES filter
- 1999
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Ingår i: IEEE SIGNAL PROCESSING LETTERS. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 1070-9908. ; 6:8, s. 205-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We introduce a novel design criterion for data-dependent narrowband filters that are of interest in temporal or spatial spectral analysis applications, The solution to the design problem considered is shown to coincide with the recently introduced amplitu
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| 9. |
- von Euler, Mia, 1967-, et al.
(författare)
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No protective effect of the NMDA antagonist memantine in experimental spinal cord injuries
- 1997
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Ingår i: Journal of Neurotrauma. - New York, USA : Mary Ann Liebert. - 0897-7151 .- 1557-9042. ; 14:1, s. 53-61
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Tidskriftsartikel (refereegranskat)abstract
- We have investigated the effect of memantine, a clinically used NMDA receptor antagonist, in two experimental animals models of spinal cord injury. The lesions were laser-induced photothrombosis to induce focal spinal cord ischemia and clip compression to mimic traumatic spinal cord injury. Pre- or posttreatment of rats with a dose of memantine (20 mg/kg ip) previously shown to be neuroprotective in cerebral ischemia, failed to affect both the neurological and morphological outcome of ischemic spinal cord injury. Likewise, memantine had no effects on neurological and morphological outcome after experimental traumatic injury. In view of the regional heterogeneity of NMDA receptors, the affinity of memantine for spinal cord NMDA receptors was also determined by studying displacement of [3H] (+)-5-methyl-10,11-dihydro-5-H-dibenzo[a,d]cyclohepten-5-10-imine (MK-801) to rat and human spinal cord homogenates. We found that memantine had an affinity for NMDA receptors in the spinal cord (Ki = 0.58 microM) that was significantly lower compared to that of the cerebral cortex (Ki = 0.23 microM) and that the affinity for NMDA receptors in human spinal cord was even lower. We conclude that in view of available data, memantine should not be chosen for clinical studies on neuroprotection in spinal cord injuries and that the lack of protective effect is most likely due to insufficient affinity of memantine for spinal cord NMDA receptors.
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| 10. |
- Ahlberg, Jörgen, 1971-, et al.
(författare)
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Representing and Compressing MPEG-4 Facial Animation Parameters using Facial Action Basis Functions
- 1999
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Ingår i: IEEE Transactions on Circuits and Systems. - : Institute of Electrical and Electronics Engineers (IEEE). - 0098-4094 .- 1558-1276 .- 1051-8215. ; 9:3, s. 405-410
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Tidskriftsartikel (refereegranskat)abstract
- In model-based, or semantic, coding, parameters describing the nonrigid motion of objects, e.g., the mimics of a face, are of crucial interest. The facial animation parameters (FAPs) specified in MPEG-4 compose a very rich set of such parameters, allowing a wide range of facial motion. However, the FAPs are typically correlated and also constrained in their motion due to the physiology of the human face. We seek here to utilize this spatial correlation to achieve efficient compression. As it does not introduce any interframe delay, the method is suitable for interactive applications, e.g., videophone and interactive video, where low delay is a vital issue.
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