El portafolios digital como herramienta para el desarrollo de competencias transversales en el alumnado.

Partiendo de un enfoque sobre las relaciones entre las tecnologías digitales como herramientas de mediación, se analiza el papel de un caso concreto, los portafolios electrónicos, para la mejora de competencias transversales en el ámbito universitario. Los resultados indican que se obtienen mejoras, como mínimo desde la percepción de los propios estudiantes, en algunas dimensiones ligadas a la capacidad para seleccionar y organizar información, así como a la planificación del aprendizaje.

La autoreferencialidad en el arte. El metalenguaje en el medio digital

Este artículo analiza las obras de algunos artistas digitales que utilizan los recursos propios del medio digital como mensaje central. Nuestra intención será exponer las múltiples formas de utilizar, desarrollar y manipular el metalenguaje. Primeramente, con la intención de comprender estas obras, se elabora un contexto en que se plantearán unos precedentes, para ver, en una segunda parte, cómo el metalenguaje en nuestra actualidad artística y digital vuelve a ser muy utilizado, de manera que llega a convertirse en una metodología característica del arte contemporáneo y de los medios digitales. Palabras clave aleatoriedad, simulación, glitch, net art, interfaz, reactividad, interactividad

El portafolios digital como herramienta para el desarrollo de competencias transversales en el alumnado.

Partiendo de un enfoque sobre las relaciones entre las tecnologías digitales como herramientas de mediación, se analiza el papel de un caso concreto, los portafolios electrónicos, para la mejora de competencias transversales en el ámbito universitario. Los resultados indican que se obtienen mejoras, como mínimo desde la percepción de los propios estudiantes, en algunas dimensiones ligadas a la capacidad para seleccionar y organizar información, así como a la planificación del aprendizaje.

Exploring neural cell dynamics with digital holographic microscopy.

In this review, we summarize how the new concept of digital optics applied to the field of holographic microscopy has allowed the development of a reliable and flexible digital holographic quantitative phase microscopy (DH-QPM) technique at the nanoscale particularly suitable for cell imaging. Particular emphasis is placed on the original biological information provided by the quantitative phase signal. We present the most relevant DH-QPM applications in the field of cell biology, including automated cell counts, recognition, classification, three-dimensional tracking, discrimination between physiological and pathophysiological states, and the study of cell membrane fluctuations at the nanoscale. In the last part, original results show how DH-QPM can address two important issues in the field of neurobiology, namely, multiple-site optical recording of neuronal activity and noninvasive visualization of dendritic spine dynamics resulting from a full digital holographic microscopy tomographic approach.

Evaluation of the SHRP Modified Georgia Digital Faultmeter, MLR-93-01, 1993

The SHRP Modified Georgia Digital Faultmeter was loaned to the Iowa Department of Transportation in January 1993 for evaluation. A study was undertaken comparing the faultmeter to Iowa's current method of fault measurement. The following conclusions were made after comparing the faultmeter to Iowa's gauge: The faultmeter was lighter and easier to maneuver and position. The faultmeter's direct readout was quicker to read. The faultmeter has increased precision. The faultmeter gave consistently lower fault readings than the Iowa gauge.

digital¡. Fifth strategic plan for UPC libraries 2012-2014

Postprint (published version)

Using Digital Video Analysis to Monitor Driver Behavior at Intersections

Commercially available instruments for road-side data collection take highly limited measurements, require extensive manual input, or are too expensive for widespread use. However, inexpensive computer vision techniques for digital video analysis can be applied to automate the monitoring of driver, vehicle, and pedestrian behaviors. These techniques can measure safety-related variables that cannot be easily measured using existing sensors. The use of these techniques will lead to an improved understanding of the decisions made by drivers at intersections. These automated techniques allow the collection of large amounts of safety-related data in a relatively short amount of time. There is a need to develop an easily deployable system to utilize these new techniques. This project implemented and tested a digital video analysis system for use at intersections. A prototype video recording system was developed for field deployment. A computer interface was implemented and served to simplify and automate the data analysis and the data review process. Driver behavior was measured at urban and rural non-signalized intersections. Recorded digital video was analyzed and used to test the system.

Reconocimiento y representación digital de la notación matemática manual

El trabajo muestra un estudio comparativo de las soluciones que plantean diferentes soluciones comerciales y/o libres para la adecuación o no a su integración en un entorno como es el campus virtual de la UOC. Para esto se ha elaborado una lista de indicadores clave y más adelante se ha hecho una valoración de la integración en el entorno UOC, relacionando los indicadores anteriores con los requerimientos de la UOC. Investigando previamente cuales son estos. Por último se ha comprobado y corroborado la posible integración de la solución elegida al campus virtual, con el desarrollo de una pequeña aplicación web.

Image quality assessment in digital mammography: part II. NPWE as a validated alternative for contrast detail analysis.

Assessment of image quality for digital x-ray mammography systems used in European screening programs relies mainly on contrast-detail CDMAM phantom scoring and requires the acquisition and analysis of many images in order to reduce variability in threshold detectability. Part II of this study proposes an alternative method based on the detectability index (d') calculated for a non-prewhitened model observer with an eye filter (NPWE). The detectability index was calculated from the normalized noise power spectrum and image contrast, both measured from an image of a 5 cm poly(methyl methacrylate) phantom containing a 0.2 mm thick aluminium square, and the pre-sampling modulation transfer function. This was performed as a function of air kerma at the detector for 11 different digital mammography systems. These calculated d' values were compared against threshold gold thickness (T) results measured with the CDMAM test object and against derived theoretical relationships. A simple relationship was found between T and d', as a function of detector air kerma; a linear relationship was found between d' and contrast-to-noise ratio. The values of threshold thickness used to specify acceptable performance in the European Guidelines for 0.10 and 0.25 mm diameter discs were equivalent to threshold calculated detectability indices of 1.05 and 6.30, respectively. The NPWE method is a validated alternative to CDMAM scoring for use in the image quality specification, quality control and optimization of digital x-ray systems for screening mammography.

Evaluation of peripheral arterial bypass grafts with multi-detector row CT angiography: comparison with duplex US and digital subtraction angiography.

PURPOSE: To assess the technical feasibility of multi-detector row computed tomographic (CT) angiography in the assessment of peripheral arterial bypass grafts and to evaluate its accuracy and reliability in the detection of graft-related complications, including graft stenosis, aneurysmal changes, and arteriovenous fistulas. MATERIALS AND METHODS: Four-channel multi-detector row CT angiography was performed in 65 consecutive patients with 85 peripheral arterial bypass grafts. Each bypass graft was divided into three segments (proximal anastomosis, course of the graft body, and distal anastomosis), resulting in 255 segments. Two readers evaluated all CT angiograms with regard to image quality and the presence of bypass graft-related abnormalities, including graft stenosis, aneurysmal changes, and arteriovenous fistulas. The results were compared with McNemar test with Bonferroni correction. CT attenuation values were recorded at five different locations from the inflow artery to the outflow artery of the bypass graft. These findings were compared with the findings at duplex ultrasonography (US) in 65 patients and the findings at conventional digital subtraction angiography (DSA) in 27. RESULTS: Image quality was rated as good or excellent in 250 (98%) and in 252 (99%) of 255 bypass segments, respectively. There was excellent agreement both between readers and between CT angiography and duplex US in the detection of graft stenosis, aneurysmal changes, and arteriovenous fistulas (kappa = 0.86-0.99). CT angiography and duplex US were compared with conventional DSA, and there was no statistically significant difference (P >.25) in sensitivity or specificity between CT angiography and duplex US for both readers for detection of hemodynamically significant bypass stenosis or occlusion, aneurysmal changes, or arteriovenous fistulas. Mean CT attenuation values ranged from 232 HU in the inflow artery to 281 HU in the outflow artery of the bypass graft. CONCLUSION: Multi-detector row CT angiography may be an accurate and reliable technique after duplex US in the assessment of peripheral arterial bypass grafts and detection of graft-related complications, including stenosis, aneurysmal changes, and arteriovenous fistulas.

Atributos topográficos e dados do Landsat7 no mapeamento digital de solos com uso de redes neurais

O objetivo deste trabalho foi avaliar variáveis discriminantes no mapeamento digital de solos com uso de redes neurais artificiais. Os atributos topográficos elevação, declividade, aspecto, plano de curvatura e índice topográfico, derivados de um modelo digital de elevação, e os índices de minerais de argila, óxido de ferro e vegetação por diferença normalizada, derivados de uma imagem do Landsat7, foram combinados e avaliados quanto à capacidade de discriminação dos solos de uma área no noroeste do Estado do Rio de Janeiro. Foram utilizados o simulador de redes neurais Java e o algoritmo de aprendizado "backpropagation". Os mapas gerados por cada um dos seis conjuntos de variáveis testados foram comparados com pontos de referência, para a determinação da exatidão das classificações. Esta comparação mostrou que o mapa produzido com a utilização de todas as variáveis obteve um desempenho superior (73,81% de concordância) ao de mapas produzidos pelos demais conjuntos de variáveis. Possíveis fontes de erro na utilização dessa abordagem estão relacionadas, principalmente, à grande heterogeneidade litológica da área, que dificultou o estabelecimento de um modelo de correlação ambiental mais realista. A abordagem utilizada pode contribuir para tornar o levantamento de solos no Brasil mais rápido e menos subjetivo.

Individual tree measurements by means of digital aerial photogrammetry

University of Helsinki, Faculty of Agriculture and Forestry, Department of Forest Resource Management

Realitat de ficció: una recerca en la impressió digital sobre suports rígids

Dins del projecte de recerca I+D Impressió expandida: repercussions dels mitjans digitals en el context de l’art imprès, amb codi: HUM 2007-64757/ARTE i finançat pel Ministerio de Ciencia yTecnologia, l’any 2007 es va constituir un sub-grup que, sota el nom d’Ars Combinatoria, hatreballat en la investigació de la impressió digital sobre diferents suports.Aquest equip investigador està format per les professores M.Mercè Casanovas, Cristina Pastó iEva Vila (col·laboradora) , totes elles vinculades a la pràctica i la docència del gravat, la litografia ila serigrafia .L’interès i la dedicació per aquestes disciplines ha anat ampliant-se i creixent amb l’aportació delsmitjans digitals, que han suposat un canvi en el format, en el projecte i en la concepció de l’obra.Per dur a terme aquesta recerca, hem rebut el suport de l’empresa barcelonina EGM Laboratoriscolor, especialitzada en la impressió digital d’alta resolució.Des d’aleshores s’ha seguit una investigació profunda sobre les diferents possibilitats de laimpressió digital damunt suports convencionals i no convencionals. Tota una recerca que, fins al moment, s’ha concretat en tres exposicions, dues de col·lectives i una d’individual, que mostren els resultats obtinguts.