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Coordinate representations for rigid parts in multibody dynamics

The paper is concerned with coordinate representations for rigid parts in multibody dynamics. The discussion is based on the general theory of the dynamics of multibody systems under constraints. General configuration coordinates are introduced and the requirement of their regularity is discussed. The use of Euler angles, quaternions and linear coordinates, where quaternions and linear coordinates

Comparison of standard resampling methods for performance estimation of artificial neural network ensembles

Estimation of the generalization performance for classification within the medical applications domain is always an important task. In this study we focus on artificial neural network ensembles as the machine learning technique. We present a numerical comparison between five common resampling techniques: k-fold cross validation (CV), holdout, using three cutoffs, and bootstrap using five different

On The Road: Following Ethnography From Orange County to Madison Avenue

Ethnography is a very abstract concept, but often perceived as a very concrete practice, but what is hidden in the slippage between the abstract and concrete, as ethnography moves. While a great deal has been written and debated about the practices, methods and outcomes of applied research, and we appreciate these debates, our own point of departure lies in a curiosity over what happens in the pro

Theory of Random Matrices and Elasticity Applied to Nanowires and Mechanical Vibrations

This thesis presents work in several areas relating to Random Matrix Theory and Elasticity. It contains 4 papers presenting work on different issues. Paper I concerns correlations between eigenvalues in random matrices of real symmetric (GOE) or quaternion real (GSE) form. It presents a calculation showing that correlations between arbitrarily many eigenvalues can be obtained from averages of a t

Temperamental diagnostics and biochemistry in suicide attempters

The aim of the present thesis was to study temperament traits and their relationships to psychiatric diagnoses, suicidal behavior and a number of biological measures in a sample of hospitalized suicide attempters. The subjects showed a bimodal distribution on the Validity scale from the Marke-Nyman Temperament (MNT) inventory, with a large subgroup showing low Validity. Cluster analyses of the sc