University of Paderborn

About: University of Paderborn is a education organization based out in Paderborn, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Computer science & Context (language use). The organization has 6684 authors who have published 16929 publications receiving 323154 citations.

Mutual diffusion in the ternary mixture of water + methanol + ethanol and its binary subsystems

Abstract: Mutual diffusion is investigated by means of experiment and molecular simulation for liquid mixtures containing water + methanol + ethanol. The Fick diffusion coefficient is measured by Taylor dispersion as a function of composition for all three binary subsystems under ambient conditions. For the aqueous systems, these data compare well with literature values. In the case of methanol + ethanol, experimental measurements of the Fick diffusion coefficient are presented for the first time. The Maxwell–Stefan diffusion coefficient and the thermodynamic factor are predicted for the ternary mixture as well as its binary subsystems by molecular simulation in a consistent manner. The resulting Fick diffusion coefficient is compared to present measurements and that obtained from the classical simulation approach, which requires experimental vapor–liquid equilibrium or excess enthalpy data. Moreover, the self-diffusion coefficients and the shear viscosity are predicted by molecular dynamics and are favorably compared to experimental literature values. The presented ternary diffusion data should facilitate the development of aggregated predictive models for diffusion coefficients of polar and hydrogen-bonding systems.

Interactive Hand Gesture-based Assembly for Augmented Reality Applications

Abstract: This paper presents an Augmented Reality (AR) assembly system for the interactive assembly of 3D models of technical systems. We use a hand tracking and hand gesture recognition system to detect the interaction of the user. The Microsoft Kinect video camera is the basis. The Kinect observes both hands of a user and the interactions. Thus, a user can select, manipulate, and assemble 3D models of mechanical systems. The paper presents the AR system and the interaction techniques we utilize for the virtual assembly. The interaction techniques have been tested by a group of users. The test results are explained and show that the interaction techniques facilitate an intuitive assembly.

Optimization and Estimation of Complex-Valued Signals: Theory and applications in filtering and blind source separation

Abstract: Complex-valued signals occur in many areas of science and engineering and are thus of fundamental interest. When developing signal processing methods in the complex domain, there are two key issues: making use of the full statistical information and optimization. In this article, we review the necessary tools to address these two key issues and provide examples in filtering and blind source separation (BSS) that utilize these tools.

FunState—an internal design representation for codesign

Abstract: In this paper, an internal design model called FunState (functions driven by state machines) is presented that enables the representation of different types of system components and scheduling mechanisms using a mixture of functional programming and state machines.It is shown here how properties relevant for scheduling and verification of specification models like boolcan dataflow, cyclostatic dataflow, synchronous dataflow, marked graphs, and communicating state machines as well as Petri nets may be represented in the FunState model. Examples of methods suited for FunState are described, such as scheduling and verification. They are based on the representation of the model's state transitions in form of a periodic graph.