Anastasia Papastergiou

Learn More
Topic maps (TM) are a new semantic approach to information organisation and they were designed to enhance navigation and information retrieval in large sets of information resources. The steady increase of interest on behalf of the academic world and the industry to exploit the potentials of TM technology, resulted to a proportional increased need for(More)
Malignant melanoma, the most deadly form of skin cancer, has a good prognosis if treated in the curable early stages. Early diagnosis and surgical excision is the most effective treatment of melanoma. Well-trained dermatologists reach a high level of diagnostic accuracy but their performance is increased by using computer aided numerical imaging tools. This(More)
Magnetoencephalographic (MEG) recordings of patients with CNS disorders were obtained using a whole-head 122-channel magnetometer SQUID and analyzed using Fourier statistical analysis. External transcranial magnetic stimulation in the order of pico Tesla (pTMS) was applied to the above patients with proper characteristics (magnetic intensity 1-7.5 pT;(More)
Muscle biopsy image morphometric analysis provides valuable diagnostic information to expert clinicians. Subsequently, there is an indispensable need to support muscle fiber morphometry with computer-aided automated systems that require no user interaction. The first step towards producing such a system is the automated border detection of muscle fibers.(More)
Several stable O-alkyl and aryl sulfonyl conjugated p-nitro-Ph and o-, m-, p-pyridine N'-hydroxy imidamides, were subjected to UV irradiation at 312 nm with supercoiled circular plasmid DNA pBluescript KS II. The generated amidinyl and sulfonyloxyl radicals led to effective DNA photo-cleavage. Both alkyl and aryl sulfonyl derivatives were active and the(More)
Early diagnosis is the most reliable solution for an effective treatment of melanoma. There is an ongoing research effort to develop computer aided imaging tools and functional content-based image retrieval systems as diagnostic support to dermatologists. Following this spirit, a Topic Map based management and retrieval system for melanoma images has been(More)
In this paper, we present an implementation of a 2-D DCT-based face recognition system, which uses a high performance parallel computing architecture, based on Graphics Processing Units (GPUs). Comparisons between the GPU-based and the “gold” CPU-based implementation in terms of execution time have been made. They show that the GPU(More)
The aim in all CAT programs is to estimate the student's ability, performance and expertise level precisely and not to refresh or even better to improve the student's knowledge in a particular topic or subject. The priority of an ITS (Intelligent Tutoring System) or of a distance learning system or a hypermedia such system is the presentation, facilitation(More)