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14 results on '"De Tisi, F"'

4. Irregularity detection from noisy data with wavelets

Author

BOZZINI, MARIA TUGOMIRA, ROSSINI, MILVIA FRANCESCA, De Tisi, F, Laurent, PJ, Le Méhauté, A, Schumaker, L, Bozzini, M, De Tisi, F, and Rossini, M

Subjects
MAT/08 - ANALISI NUMERICA, Irregularity detection, Computer vision, Wavelet transform, Noisy data, Computer graphic, Tomography
Published
1994

5. Behavior of the beta-splines with values of the parameters beta$2$ negative

Author

De Tisi, F, ROSSINI, MILVIA FRANCESCA, De Tisi, F, and Rossini, M

Subjects
MAT/08 - ANALISI NUMERICA, Beta-splines
Abstract

In this paper we study the behavior of the beta-spline functions in the case the parameter β2(i) is negative. We prove that a negative value β ̂2(i) exists so that if β2(i) > β ̂2(i) ∀i, the beta-spline functionsNi(u) are positive. Moreover, if the control vertices are such that x0 ≤ ⋯ ≤ xm-1, we have proved that the design curve keeps the properties already proved in the case β2(i) ≥ 0. © 1992.

Published
1992

6. Irregularity detection from noisy data with wavelets

Author

Laurent, PJ, Le Méhauté, A, Schumaker, L, Bozzini, M, De Tisi, F, Rossini, M, BOZZINI, MARIA TUGOMIRA, ROSSINI, MILVIA FRANCESCA, Laurent, PJ, Le Méhauté, A, Schumaker, L, Bozzini, M, De Tisi, F, Rossini, M, BOZZINI, MARIA TUGOMIRA, and ROSSINI, MILVIA FRANCESCA

Published
1994

7. An approximation method of the local type. Application to a problem of heart potential mapping

Author

Bozzini, M, De Tisi, F, Lenarduzzi, L, BOZZINI, MARIA TUGOMIRA, Lenarduzzi, L., Bozzini, M, De Tisi, F, Lenarduzzi, L, BOZZINI, MARIA TUGOMIRA, and Lenarduzzi, L.

Abstract

In this paper a local type method is proposed to smooth noisy data. Criteria of convergence and error bounds are given. An applciation is also presented for a biomedical problem in R3, which is usually solved only in R2. © 1984 Springer-Verlag.

Published
1984

8. Reduced set of leads for electrocardiography, maintaining significant information

Author

Bozzini, M, De Tisi, F, Lenarduzzi, L, BOZZINI, MARIA TUGOMIRA, Lenarduzzi,L, Bozzini, M, De Tisi, F, Lenarduzzi, L, BOZZINI, MARIA TUGOMIRA, and Lenarduzzi,L

Abstract

For clinical application of heart potential mapping, a reduced set of leads is determined, yet suitable to represent all possible phenomenologies. The analysis of the reliability of the model is done and some numerical results are presented. © 1985.

Published
1985

12. Reduced set of leads for electrocardiography, maintaining significant information

Author

F De Tisi, Licia Lenarduzzi, Mira Bozzini, Bozzini, M, De Tisi, F, and Lenarduzzi, L

Subjects
Thoracic isopotential countouring, Reduction of lead, medicine.diagnostic_test, Applied Mathematics, Heat potential mapping, Heart pathologie, Reliability engineering, MAT/08 - ANALISI NUMERICA, Set (abstract data type), Electrocardiography, Computational Mathematics, Numerical results, medicine, Algorithm, Reliability (statistics), Mathematics
Abstract

For clinical application of heart potential mapping, a reduced set of leads is determined, yet suitable to represent all possible phenomenologies. The analysis of the reliability of the model is done and some numerical results are presented.

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13. An approximation method of the local type. Application to a problem of heart potential mapping

Author

F De Tisi, Mira Bozzini, Licia Lenarduzzi, Bozzini, M, De Tisi, F, and Lenarduzzi, L

Subjects
Numerical Analysis, Mathematical optimization, Local type, Heart potential mapping, Method of the local type, Computer Science Applications, Theoretical Computer Science, MAT/08 - ANALISI NUMERICA, Computational Mathematics, Computational Theory and Mathematics, Approximation error, Convergence (routing), Smoothing noisy data, Error bound, Convergence, Computer communication networks, Noisy data, Software, Mathematics
Abstract

In this paper a local type method is proposed to smooth noisy data. Criteria of convergence and error bounds are given. An applciation is also presented for a biomedical problem in ℝ3, which is usually solved only in ℝ2. © 1984 Springer-Verlag.

Published
1984

14. A new method in order to determine the most significant members within a large sample, in problems of surface approximation

Author

Flavia de Tisi, Licia Lenarduzzi, Mira Bozzini, Bozzini, M, De Tisi, F, and Lenarduzzi, L

Subjects
Surface (mathematics), Surface approximation, Hierarchy (mathematics), Numerical examples, Sampling (statistics), Geodetic datum, Representative subsample, Domain of influence, Large sample, MAT/08 - ANALISI NUMERICA, Principal component method, Statistics, Local analysi, Order (group theory), Applied mathematics, Principal Components method, Significance estimation, Mathematics
Abstract

From an initial large sample a smaller, yet representative subsample is to be determined. As an alternative to the principal component method, a new method is proposed: “domains of influence” of each datum relative to nearby data and a hierarchy of significance are determined. The properties are discussed and numerical examples are given.

Published
1986

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