The appearance of retinal blood vessels is an important diagnostic indicator of serious disease, such as hypertension, diabetes, cardiovascular disease, and stroke. Automatic segmentation of the retinal vasculature is a primary step towards automatic assessment of the retinal blood vessel features. This paper presents an automated method for the enhancement and segmentation of blood vessels in ...

Introduction: Crosstalk is a leakage of X-ray or light produced in a matrix of X-ray detectors or array of photodiodes in one element to other elements affecting on image contrast and spatial resolution. In this study, we assessed X-ray crosstalk in a computed tomography (CT) scanner with small detector elements to estimate the effect of various parameters such as X-ray tube voltage, detector e...

We continue our study of document marking to deter illicit dissemination. An experiment we performed reveals that the distortion on the photocopy of a document is very diierent in the vertical and horizontal directions. This leads to the strategy that marks a text line both vertically using line shifting and horizontally using word shifting. A line that is marked is always accompanied by two un...

Aims. Lumped-element kinetic inductance detectors (LEKIDs) are an attractive technology for millimeter-wave observations that require large arrays of extremely low-noise detectors. We designed, fabricated and characterized 64-element (128 LEKID) arrays of horn-coupled, dual-polarization LEKIDs optimized for ground-based CMB polarimetry. Our devices are sensitive to two orthogonal polarizations ...

This paper considers the government's initiative to change the teaching of literacy in primary schools in England. It draws on evidence from a one-year ESRC funded project that observed teaching in the first year of the NLS and a two-year follow-up study that revisited and re-interviewed several of the teachers from the original study. It proposes that, although substantial changes have been ma...

Project DIAPLASIS (Greek Acronym for “Online Platform for School – Family Collaboration”) is a Doctoral Thesis aiming to develop an online system that allows collaboration between school and family, and to evaluate possible learning results in a two-year intervention with at-risk students. At least 9% of students in Cyprus are found to be at risk of failure in Language and Mathematics. Research...

This paper describes the process used to develop and implement an assessment plan from the ground up for a new Master of Information Systems program. The mapping of learning goals to objectives to specific courses is illustrated with direct and indirect measures. The program was first offered January 2008, and the second cohort of completed January, 2010. Assessment results from the first two c...

The TWINS project (Two Wide-angle Imaging Neutral-atom Spectrometers) is mainly devoted to measure high energy neutral atoms (ENAs) originating via charge exchange of protons with geocoronal hydrogen atoms in the plasmasphere and magnetosphere. In order to unfold the local ion density along the line-of-sight (LOS) from the integrated ENA flux measurements, a good knowledge of the geocoronal hyd...