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Surveys in Mathematics and its Applications

ISSN1842-6298 Volume1(2006), 41 – 49

OPTIMAL ALTERNATIVE TO THE AKIMA’S

METHOD OF SMOOTH INTERPOLATION

APPLIED IN DIABETOLOGY

Alexandru Mihai Bica, Marian Degeratu,

Luiza Demian and Emanuel Paul

Abstract. It is presented a new method of cubic piecewise smooth interpolation applied to experimental data obtained by glycemic pro…le for diabetics. This method is applied to create a soft useful in clinical diabetology. The method give an alternative to the Akima’s procedure of the derivatives computation on the knots from [1] and have an optimal property.

References

[1] H. Akima,

A new method for interpolation and smooth curve …tting based on

local procedure,

J. Assoc. Comput. Mach.

17

(1970), 589-602.

Zbl 0209.46805

.

[2] A. M. Bica,

Mathematical models in biology governed by di¤erential equations,

PhD Thesis Babe¸s-Bolyai University Cluj-Napoca 2004.

[3] A. Bica,

Lyapunov function for a bidimensional system model in the blood glucose

homeostasis and clinical interpretation,

Int. J. Evol. Equ.

1,

no. 1 (2005), 69–79.

MR2144218

(2005m:92010).

Zbl 1094.34029

.

[4] A. M. Bica, M. Curil¼

a and S. Curil¼

a,

Optimal piecewise smooth interpolation

of experimental data,

Proceedings of ICCCC2006 (International Conference on

Computing, Comunications, Control, 2006), Oradea, 74-79.

[5] C. Iacob(ed),

Classical and modern mathematics

, vol.4, Ed. Tehnica, Bucharest

1983 (in Romanian).

2000 Mathematics Subject Classi…cation: 57R12, 65D05.

Keywords: piecewise smooth interpolation, smooth approximations, quadratic oscillation in average, least squares method.

The research of the …rst author on this paper is supported by the grant 2Cex-06-11-96 of the Romanian Government

******************************************************************************

(2)

2

A.M. Bica, M. Degeratu, L. Demian and E. Paul

[6] K.Ichida, F.Yoshimoto and T. Kiyono,

Curve

…tting by a Piecewise Cubic

Polynomial,

Computing

16

no. 4 (1976), 329–338.

MR0403168

(53 #6981).

Zbl

0321.65010

.

Alexandru Mihai Bica Marian Degeratu University of Oradea, University of Oradea,

Department of Mathematics and Informatics, Department of Mathematics and Informatics, Str. Universitatii no.1, 410087, Oradea, Str. Universitatii no.1, 410087, Oradea,

Romania. Romania.

email: [email protected], [email protected] email: [email protected]

Luiza Demian Emanuel Paul

University of Oradea, University of Oradea,

Faculty of Medicine and Pharmacy, Department of Mathematics and Informatics, Str. Universitatii no.1, 410087, Oradea. Str. Universitatii no.1, 410087, Oradea.

Romania. Romania.

email: [email protected]

****************************************************************************** Surveys in Mathematics and its Applications1(2006), 41 – 49

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