#### Filter Results:

- Full text PDF available (27)

#### Publication Year

1999

2016

- This year (0)
- Last 5 years (14)
- Last 10 years (26)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Cell Type

#### Key Phrases

#### Method

Learn More

- Jordi Heijman, Antonio Zaza, +4 authors Ronald L. Westra
- PLoS Computational Biology
- 2013

Beat-to-beat variability of repolarization duration (BVR) is an intrinsic characteristic of cardiac function and a better marker of proarrhythmia than repolarization prolongation alone. The ionic mechanisms underlying baseline BVR in physiological conditions, its rate dependence, and the factors contributing to increased BVR in pathologies remain… (More)

- Ivo W. M. Bleylevens, Ralf L. M. Peeters, Bernard Hanzon
- J. Symb. Comput.
- 2007

The problem of finding the global minimum of a so-called Minkowski-norm dominated polynomial can be approached by the matrix method of Stetter-Möller, which reformulates it as a large eigenvalue problem. A drawback of this approach is that the matrix involved is usually very large. However, all that is needed for modern iterative eigenproblem solvers (such… (More)

- Bernard Hanzon, Ralf L. M. Peeters
- MCSS
- 2000

- Joël M. H. Karel, Sandro A. P. Haddad, Senad Hiseni, Ronald L. Westra, Wouter A. Serdijn, Ralf L. M. Peeters
- IEEE Trans. on Circuits and Systems
- 2012

Signal processing by means of analog circuits offers advantages from a power consumption viewpoint. A method is described to implement wavelets in analog circuits by fitting the impulse response of a linear system to the time-reversed wavelet function. The fitting is performed using local search involving an criterion, starting from a deterministic starting… (More)

This paper deals with the problem of computing a best rational L approximation of specified order to a given multivariable transfer function. The problem is equivalently formulated as a minimization problem over the manifold of lossless transfer functions of fixed order. To describe this manifold, we use some Schur parameters which allows for a state-space… (More)

- Pietro Bonizzi, Joël M. H. Karel, Olivier Meste, Ralf L. M. Peeters
- Advances in Adaptive Data Analysis
- 2014

- Matthijs J. M. Cluitmans, Joel Karel, +4 authors Ronald L. Westra
- 2015 Computing in Cardiology Conference (CinC)
- 2015

Noninvasive imaging of electrical activity of the heart has increasingly gained attention last decades. Heart-surface potentials are reconstructed from a torso-heart geometry and body-surface potentials recorded from tens to hundreds of body-surface electrodes. However, it remains an open question how many electrodes are needed to accurately reconstruct… (More)

- Matthijs J. M. Cluitmans, Monique M. J. de Jong, Paul G. A. Volders, Ralf L. M. Peeters, Ronald L. Westra
- Computing in Cardiology 2014
- 2014

The objective of the inverse problem of electrocardiography is to noninvasively reconstruct information about electrical activity at the heart surface (epicardium), from electrical measurements on the body surface and a patient-specific torso-heart geometry. This is complicated by the ill-posedness of the inverse problem. Previously, we have shown that a… (More)

This paper presents an analog implementation of the complex wavelet transform using both the complex first order system (CFOS) and the Padé approximation. The complex wavelet filter design is based on the combination of the real and the imaginary state-space descriptions that implement the respective transfer functions. In other words, a complex filter is… (More)