Search results for "Digital"
showing 10 items of 3267 documents
Search for Microphysical Signatures of Stochastic Condensation in Marine Boundary Layer Clouds Using Airborne Digital Holography
2019
REGEOTOP: New climatic data fields for East Asia based on localized relief information and geostatistical methods
2004
Climate data fields represent essential tools for climate, biogeographical and agricultural research to run models and to provide observational data for the verification of global climate models (GCM). Climate data fields are generated through interpolation of observations taken at meteorological stations. Most current interpolation procedures try to describe the influence of topography on spatial climatic variations by relating them directly to absolute elevation or by introducing simple relief variables such as exposure. In both cases this may not properly describe spatial climatic variations, particularly not those of precipitation. This paper describes a regionalization procedure (REGEO…
Integration of fuzzy logic and image analysis for the detection of gullies in the Calhoun Critical Zone Observatory using airborne LiDAR data
2017
Abstract The entire Piedmont of the Southeastern United States, where the Calhoun Critical Zone Observatory (CCZO) is located, experienced one of the most severe erosive events of the last two centuries. Forested areas were cleared to cultivate cotton, tobacco, and other crops during the nineteenth and early twentieth century and these land use changes, together with intense rainfalls, initiated deep gullying. An accurate mapping of these landforms is important since, despite some gully stabilization and reforestation efforts, gullies are still major contributors of sediment to streams. Mapping gullies in the CCZO area is hindered by the presence of dense canopy, which precludes the identif…
Los sistemas de información y la auditoría informática aplicados a una institución fiscalizadora subestatal: la Sindicatura de Comptes de la Comunida…
2020
La digitalización es un fenómeno global que afecta a todas las actividades humanas. Las administraciones públicas también han incorporado a sus estructuras las nuevas tecnologías de la información y la comunicación, de manera que el sector público se ha informatizado completamente. En este contexto digital, la auditoría informática es una herramienta que permite fiscalizar las administraciones públicas y, a la vez, mejora la rendición de cuentas. Este artículo examina las principales ventajas y riesgos de la digitalización y ofrece un estudio de caso centrado en una institución fiscalizadora pública española que ha implementado la auditoría informática para auditar todas las operaciones de …
Metodi per la ricostruzione virtuale e la visualizzazione di opere d'architettura perdute
2022
Digital technologies for architecture representation have strongly modified uses and rules inherited from a millennial tradition. In the initial development period CAD tools worked as electronic drafting machines and digital drawings were almost similar to hand-made drawings; plans, fronts, sections and the like. In this period perspective and axonometric drawings were rarely executed because architects realized that these drawings had to be substituted by 3D digital models views, but modeling tools were not so familiar to professionals, both for software and hardware limitations. The evolution of architecture digital representation is still in progress, but it is possible to outline a prec…
Disadvantaged by Disability: Examining the Accessibility of Cyber Security
2021
Today, we are living in a digitally dependent world. Through the use of digital technologies, life is meant to be easier and streamlined. This includes giving access to services that previously were unavailable to many due to disability. Although technology has evolved immensely over the past few decades, reducing the digital divide, authentication methods have changed very little. Authentication is the forefront of securing users’ information, services and technology, yet for many it still poses issues in terms of usability and security, due to specific characteristics of different disabilities. In this paper, drawing upon a literature review, a review of recognized disabilities, and the r…
Mathematical Methods in Image Processing and Computer Vision
2016
Image processing and computer vision are growing research fields that take advantage of the increasing power or modern computers linked with sophisticated techniques coming from many fields of expertise and in particular from mathematics. We present an introduction to some problems in computer vision and image processing and to some mathematical techniques and concepts that are nowadays routinely used to approach them.
Low cost three-dimensional virtual model construction for remanufacturing industry
2018
Remanufactured products can save up to 80% of production and energy costs whilst generating lower CO2 emissions. The key success factors for remanufacturing are quality, lead-time and cost. Extensive work within the industry and the detailed analysis of the remanufacturing process has shown that component inspection has significant bearing on overall productivity. Remanufacturing lacks automation because activities are predominantly manual. Automation of remanufacturing process will not only decrease the number of non-remanufacturable components, through decreasing cost and increasing consistency in quality, but also attract industries to design for remanufacture. A digital model of the com…
Landsat TM/ETM+ and tree-ring based assessment of spatiotemporal patterns of the autumnal moth (Epirrita autumnata) in northernmost Fennoscandia
2010
Abstract We used fine-spatial resolution remotely sensed data combined with tree-ring parameters in order to assess and reconstruct disturbances in mountain birch ( Betula pubescens ) forests caused by Epirrita autumnata (autumnal moth). Research was conducted in the area of Lake Tornetrask in northern Sweden where we utilized five proxy parameters to detect insect outbreak events over the 19th and 20th centuries. Digital change detection was applied on three pairs of multi-temporal NDVI images from Landsat TM/ETM+ to detect significant reductions in the photosynthetic activity of forested areas during disturbed growing seasons. An image segmentation gap-fill procedure was developed in orde…