The Cyprus Institute

About: The Cyprus Institute is a other organization based out in Nicosia, Cyprus. It is known for research contribution in the topics: Aerosol & Environmental science. The organization has 418 authors who have published 1252 publications receiving 32586 citations.

A Reconstruction Method based on a Data Analysis Scheme for SPECT Imaging in Parkinson's Disease

Abstract: We present a novel method for tomographic image reconstruction in the field of Dopamine Transporter (DAT) imaging with Single Photon Emission Computed Tomography (SPECT). The reconstruction method implements the Athens Model Independent Analysis Scheme (AMIAS), a data analysis method of general applicability in inverse scattering problems. In this framework, the physical characteristics of the radioactivity distribution in the striatum are parametrized and formulated as mathematical”objects” representing the uptake of the radiophar-maceutical in segmented Regions Of Interest (ROIs). Projection data obtained from phantom simulation studies were used to evaluate the efficacy of the method. The resulting AMIAS images are compared to those produced by the Maximum Likelihood Expectation Maximization (MLEM) and Filtered Back Projection (FBP) techniques and found to be significantly superior.

Visualising the dark sky IEEE SciVis contest 2015

Abstract: Cosmological simulations are a cornerstone of our understanding of the Universe during its 13.7 billion year progression from small fluctuations that we see in the cosmic microwave background to today, where we are surrounded by galaxies and clusters of galaxies interconnected by a vast cosmic web. In this paper, we present our results on the 2015 IEEE Scientific Visualization Contest, which pertains to datasets derived from the Dark Sky Simulations [10]. We ingest, process and visualise cosmological data of particle clouds and halo formations in terms of positions and shed light on various properties of scientific interest including graviational potential, velocity and spin.

Qualitative morphological analysis of muscle biopsies using neural networks

Abstract: Qualitative data from human muscle biopsies have been extracted and analyzed by artificial neural network (ANN) models trained with the Kohonen's self-organizing feature maps algorithm to provide an automated medical diagnosis. Data from 6 distinct groups of neuromuscular disorders were examined. Training and evaluation were carried out on 80 and 25 cases respectively. The diagnostic performance of models investigated varied form 87 to 95%, and 88 to 92% for the training and evaluation. Furthermore, the diagnostic usefulness of the self-organizing feature map models was tested on 11 muscle biopsies with no specific diagnostic findings that gave encouraging results.

Gradient of Segmental Dynamics in Stereoregular Poly(Methyl Methacrylate) Melts Confined between Pristine or Oxidized Graphene Sheets.

Abstract: Segmental dynamics in unentangled isotactic, syndiotactic, and atactic poly(methyl methacrylate) (i-, a-, and s-PMMA) melts confined between pristine graphene, reduced graphene oxide, RGO, or graphene oxide, GO, sheets is studied at various temperatures, well above glass transition temperature, via atomistic molecular dynamics simulations. The model RGO and GO sheets have different degrees of oxidization. The segmental dynamics is studied through the analysis of backbone torsional motions. In the vicinity of the model nanosheets (distances less than ≈2 nm), the dynamics slows down; the effect becomes significantly stronger with increasing the concentration of the surface functional groups, and hence increasing polymer/surface specific interactions. Upon decreasing temperature, the ratios of the interfacial segmental relaxation times to the respective bulk relaxation times increase, revealing the stronger temperature dependence of the interfacial segmental dynamics relative to the bulk dynamics. This heterogeneity in temperature dependence leads to the shortcoming of the time-temperature superposition principle for describing the segmental dynamics of the model confined melts. The alteration of the segmental dynamics at different distances, d, from the surfaces is described by a temperature shift, ΔTseg(d) (roughly speaking, shift of a characteristic temperature). Next, to a given nanosheet, i-PMMA has a larger value of ΔTseg than a-PMMA and s-PMMA. This trend correlates with the better interfacial packing and longer trains of i-PMMA chains. The backbone torsional autocorrelation functions are shown in the frequency domain and are qualitatively compared to the experimental dielectric loss spectra for the segmental α-relaxation in polymer nanocomposites. The eT″(f) (analogous of dielectric loss, e″(f), for torsional motion) curves of the model confined melts are broader (toward lower frequencies) and have lower amplitudes relative to the corresponding bulk curves; however, the peak frequencies of the eT″(f) curves are only slightly affected.

Bringing New Life to Video Narratives for Exploring Cultural Heritage

Abstract: In this paper we present a project of creating a web based interactive encyclopedia of historical knowledge related to the history of the religions, the Bible and the history in general. The main source of information in the project is a film made by the Israel Museum that accompanies the exhibition of the Dead Sea Scrolls the oldest remaining copies of the Bible and extra Biblical documents. The film is describing the life of the members of the ancient community of Qumran that was behind the creation of the Dead Sea Scrolls. In order to annotate the video we developed a data repository for creating and for linking various types of digital information to the video. Data stored in the repository is then used to develop tools for exploring the film and related annotations.