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- Volker Tresp, Thomas Briegel, J. Moody
- IEEE Trans. Neural Networks
- 1999

We study the application of neural networks to modeling the blood glucose metabolism of a diabetic. In particular we consider recurrent neural networks and time series convolution neural networks which we compare to linear models and to nonlinear compartment models. We include a linear error model to take into account the uncertainty in the system and for… (More)

- Thomas Briegel, Volker Tresp
- NIPS
- 1998

We present Monte-Carlo generalized EM equations for learning in nonlinear state space models. The difficulties lie in the Monte-Carlo E-step which consists of sampling from the posterior distribution of the hidden variables given the observations. The new idea presented in this paper is to generate samples from a Gaussian approximation to the true posterior… (More)

- Thomas Briegel, Volker Tresp
- NIPS
- 1999

We replace the commonly used Gaussian noise model in nonlinear regression by a more flexible noise model based on the Student-tdistribution. The degrees of freedom of the t-distribution can be chosen such that as special cases either the Gaussian distribution or the Cauchy distribution are realized. The latter is commonly used in robust regression. Since… (More)

- Thomas Briegel
- 2002

The blood glucose metabolism of a diabetic is a complex nonlinear process closely linked to a number of internal factors which are not easily accessible to measurement. Based on accessible information – such as occasional blood glucose measurements and information about food intake and physical exercise – the system appears highly stochastic and the… (More)

- Volker Tresp, Thomas Briegel
- NIPS
- 1997

We consider neural network models for stochastic nonlinear dynamical systems where measurements of the variable of interest are only available at irregular intervals i.e. most realizations are missing. Dif£culties arise since the solutions for prediction and maximum likelihood learning with missing data lead to complex integrals, which even for simple cases… (More)

We consider sequential or online learning in dynamic neural regression models. By using a state space representation for the neural network’s parameter evolution in time we obtain approximations to the unknown posterior by either deriving posterior modes via the Fisher scoring algorithm or by deriving approximate posterior means with the importance sampling… (More)

We study the application of neural networks to modeling the blood glucose metabolism of a diabetic. In particular we consider recurrent neural networks and time series convolution neural networks which we compare to linear models and to nonlinear compartment models. We include a linear error model to take into account the uncertainty in the system and for… (More)

We consider sequential or online learning in dynamic neural regression models. By using a state space representation for the neural network’s parameter evolution in time we obtain approximations to the unknown posterior by either deriving posterior modes via the Fisher scoring algorithm or by deriving approximate posterior means with the importance sampling… (More)

We replace the commonly used Gaussian noise model in nonlinear regression by a more ¤exible noise model based on the Student-tdistribution. The degrees of freedom of the t-distribution can be chosen such that as special cases either the Gaussian distribution or the Cauchy distribution are realized. The latter is commonly used in robust regression. Since the… (More)

- H Berger, A Leibl, P Kohz, T Briegel, E Pratschke
- RoFo : Fortschritte auf dem Gebiete der…
- 1993

19 out of 37 patients with percutaneous cholecystostomy were followed up for assessment of gallbladder function after percutaneous drainage. 17 out of 19 of the patients remained free from symptoms of gallbladder disease during a mean follow-up period of 25.8 months. Contractility of the gallbladder calculated by measurement of the sonographic diameter of… (More)

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