Zusammenfassung Mit einem Sprachenidentifizierer für 45 Sprachen wurden die prozentualen Anteile der verschiedenen Sprachen an allen Webseiten durch eine repräsentative Analyse des Indexes von AllTheWeb vom Sommer 1999 ermittelt. Zunächst wird die Funktionsweise und die Performanz des verwendeten Sprachenidentifizierers kurz dargestellt Im Hauptteil werden die Ergebnisse der Index-Auswertung pr...

Studies of DEM error have consistently found a link between terrain characteristics such as slope shape or steepness and error. This link is explored by looking at error in relation to various geomorphometric measures for a study area in Scotland. The magnitude of error is found to vary systematically between convex, planar and convex areas and measures of terrain roughness show some degree of ...

The remote sensing technique has been widely applied in global topographic survey, e.g., for computing a digital elevation model (DEM). The synthetic aperture radar (SAR) is able to perform a synoptic monitoring of the Earth under all-weather and day-and-night conditions. Among the SAR-derived DEM reconstruction techniques, four different methods, i.e., clinometry, grammetry, interferometry and...

Herrn Prof. Dr. L. Z e r v a s , Athen, danken wir für wertvolle Hinweise, Herrn Dr. J. G l i e m a n n , Kopen­ hagen, für die biologischen Teste. Dem Gesamtverband der Textilindustrie in der Bundesrepublik Deutschland, der Arbeitsgemeinschaft Industrieller Forschungsver­ einigungen e. V. und dem Bundesministerium für Wirtschaft danken wir für die Förderung des For­ schungsvorhabens 1318. Fern...

High-altitude Himalayan terrain exhibits extreme geometric distortion along north-facing (dilation) and south-facing (compression) slopes as observed in satellite stereo data with high look angles. In the present study, Cartosat-1 stereo pairs have been used for generating Digital Elevation Model (DEM) using Differential Global Positioning System based Ground Control Points. DEM quality assessm...

KEM (Key Encapsulation Mechanism) and DEM (Data Encapsulation Mechanism) were introduced by Shoup to formalize the asymmetric encryption specified for key distribution and the symmetric encryption specified for data exchange in ISO standards on public-key encryption. Shoup defined the “semantic security (IND) against adaptive chosen ciphertext attacks (CCA2)” as a desirable security notion of K...

Digital elevation models (DEM) are numerical representation of terrain elevation data that has been used in a wide range of spatial analysis applications. The principles for acquisition, storage, management, update, spatial analysis, visualization as well as integration with other systems are reasonably well known. However, as DEM applications are becoming increasingly more widespread, so does ...

Empirical research in DEM accuracy assessment has observed that DEM errors are correlated with terrain morphology, sampling density, and interpolation method. However, theoretical reasons for these correlations have not been accounted for. This paper introduces approximation theory adapted from computational science as a new framework to assess the accuracy of DEMs interpolated from topographic...

Mutations affecting the conversion of spectrin dimers to tetramers result in hereditary elliptocytosis (HE), whereas a deficiency of human erythroid alpha- or beta-spectrin results in hereditary spherocytosis (HS). All spontaneous mutant mice with cytoskeletal deficiencies of spectrin reported to date have HS. Here, the first spontaneous mouse mutant, sph(Dem)/ sph(Dem), with severe HE is descr...