Bei der Analyse und dem Design drahtloser Kommunikationssysteme spielt die Modellierung und Simulation der Signalausbreitungswege eine immer wichtigere Rolle. Im Zusammenhang mit adaptiven Empfängerkonzepten für zukünftige Mobilfunksysteme sind dabei die räumlichen Ausbreitungseigenschaften auf dem Funkkanal von besonderem Interesse. Aus der Literatur sind verschiedene Modellierungsansätze beka...

This paper describes the effect of DEM data resolution on predictions from the SWAT model. Measured hydrologic, meteorological, watershed characteristics and water quality data from Moores Creek watershed (near Lincoln, AR, USA) were used in the simulation. The effect of input data resolution was evaluated by running seven scenarios at increasing DEM grid sizes (30 ð 30 m, 100 ð 100 m, 150 ð 15...

The paper presents the development of dynamic domain decomposition applied to hopper discharge simulation by the discrete element method (DEM). Parallel neighbour search algorithm, non-blocking interprocessor communication and dynamic load balancing are implemented in the DEM code. Parallel speed-up analysis is performed solving the complex hopper discharge problems containing 100000 and 300000...

In this study, we present the DEM-SPM method, a Lagrangian-Lagrangian coupled algorithm, for simulating solid-liquid flows involving free surfaces. The DEM solid phase and the SPH liquid phase are connected using the local averaging technique, where the governing equations are modeled taking account of the local mean voidage. Conservative forms of momentum balance are derived via a variational ...

Zusammenfassung. Es werden die Grundlagen eines computergrafischen Atlanten der menschlichen Anatomie (Virtual Human) dargestellt, der kinematische und funktionelle Eigenschaften aufweist. Nach der Generierung von Oberflächenmodellen des Skeletts werden diese für eine interaktiv gesteuerte Kinematik aufbereitet. Die Navigation und Interaktion mit dem Modell erfolgt über eine VRML Oberfläche. Zu...

In the past few years, the Himalayan region has experienced a number of floods from glacial lakes, and the neighboring areas were severely damaged. Therefore it is important to continue monitoring glaciers or creating simulation of floods to prevent the damages in those regions. The DEM is very useful for studying these hazardous problems. In this study, we tried to generate DEM by TerraSAR-X i...

The slope length and steepness (LS) factor is one of the factors in the Revised Universal Soil Loss Equation (RUSLE) needed to estimate average annual erosion rate. The LS factor is often derived from digital elevation models (DEM). DEM errors and uncertainty could affect LS factor estimation and consequently erosion rate estimation. However, DEM uncertainties are not always accounted for, and ...