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Search Results: 1 - 10 of 369 matches for " Ilias Nikolakopoulos "
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Estimating the Disease Burden of 2009 Pandemic Influenza A(H1N1) from Surveillance and Household Surveys in Greece
Vana Sypsa,Stefanos Bonovas,Sotirios Tsiodras,Agoritsa Baka,Panos Efstathiou,Meni Malliori,Takis Panagiotopoulos,Ilias Nikolakopoulos,Angelos Hatzakis
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0020593
Abstract: The aim of this study was to assess the disease burden of the 2009 pandemic influenza A(H1N1) in Greece.
Fragmentation processes in two-phase materials
Humberto A. Carmona,Anderson V. Guimar?es,José S. Andrade Junior,Ilias Nikolakopoulos,Falk K. Wittel,Hans J. Herrmann
Physics , 2014, DOI: 10.1103/PhysRevE.91.012402
Abstract: We investigate the fragmentation process of solid materials with crystalline and amorphous phases using the discrete element method. Damage initiates inside spherical samples above the contact zone in a region where the circumferential stress field is tensile. Cracks initiated in this region grow to form meridional planes. If the collision energy exceeds a critical value which depends on the material's internal structure, cracks reach the sample surface resulting in fragmentation. We show that this primary fragmentation mechanism is very robust with respect to the internal structure of the material. For all configurations, a sharp transition from the damage to the fragmentation regime is observed, with smaller critical collision energies for crystalline samples. The mass distribution of the fragments follows a power law for small fragments with an exponent that is characteristic for the branching merging process of unstable cracks. Moreover this exponent depends only on the dimensionally of the system and not on the micro structure.
Visual Allesthesia in a Patient with Glioblastoma Multiforme  [PDF]
Antonios Reptsis, Iordanis Demirtzoglou, Athanasios Nikolakopoulos, Diamantis Almaliotis, Vasileios Karampatakis, Angeliki Cheva
Open Journal of Ophthalmology (OJOph) , 2012, DOI: 10.4236/ojoph.2012.23021
Abstract: Purpose: To report a rare case of visual allesthesia in a patient with glioblastoma multiforme. Material - Methods : A 46 – year old male presented in emergency ophthalmologic department complaining for difficulties in performing tasks related to color discrimination in his occupation (PC technician). The patient underwent a thorough ophthalmological examination and then he was referred to the neurological department for further evaluation. Results: The patient presented an atypical pattern of color perception disturbance. His best corrected visual acuity decreased progressively during hospitalization. He also experienced visual allesthesia paroxysmally (illusory left homonymous transpositions of subjects viewed in the right homonymous visual field). The visual field evaluation revealed homonymous left hemianopsia. Magnetic resonance imaging revealed glioblastoma multiforme confirmed by biopsy. Conclusions: A thorough ophthalmological and neuro-imaging control is suggested in patients with sudden color perception disturbance. Patients with temporal or occipital cortex damage may experience visual allesthesia.
Adaptive Compression of Slowly Varying Images Transmitted over Wireless Sensor Networks
George Nikolakopoulos,Dionisis Kandris,Anthony Tzes
Sensors , 2010, DOI: 10.3390/s100807170
Abstract: In this article a scheme for image transmission over Wireless Sensor Networks (WSN) with an adaptive compression factor is introduced. The proposed control architecture affects the quality of the transmitted images according to: (a) the traffic load within the network and (b) the level of details contained in an image frame. Given an approximate transmission period, the adaptive compression mechanism applies Quad Tree Decomposition (QTD) with a varying decomposition compression factor based on a gradient adaptive approach. For the initialization of the proposed control scheme, the desired a priori maximum bound for the transmission time delay is being set, while a tradeoff among the quality of the decomposed image frame and the time needed for completing the transmission of the frame should be taken under consideration. Based on the proposed control mechanism, the quality of the slowly varying transmitted image frames is adaptively deviated based on the measured time delay in the transmission. The efficacy of the adaptive compression control scheme is validated through extended experimental results.
Random Surfing Without Teleportation
Athanasios N. Nikolakopoulos,John D. Garofalakis
Computer Science , 2015, DOI: 10.1007/978-3-319-24024-4_19
Abstract: In the standard Random Surfer Model, the teleportation matrix is necessary to ensure that the final PageRank vector is well-defined. The introduction of this matrix, however, results in serious problems and imposes fundamental limitations to the quality of the ranking vectors. In this work, building on the recently proposed NCDawareRank framework, we exploit the decomposition of the underlying space into blocks, and we derive easy to check necessary and sufficient conditions for random surfing without teleportation.
Top-N recommendations in the presence of sparsity: An NCD-based approach
Athanasios N. Nikolakopoulos,John D. Garofalakis
Computer Science , 2015, DOI: 10.3233/WEB-150324
Abstract: Making recommendations in the presence of sparsity is known to present one of the most challenging problems faced by collaborative filtering methods. In this work we tackle this problem by exploiting the innately hierarchical structure of the item space following an approach inspired by the theory of Decomposability. We view the itemspace as a Nearly Decomposable system and we define blocks of closely related elements and corresponding indirect proximity components. We study the theoretical properties of the decomposition and we derive sufficient conditions that guarantee full item space coverage even in cold-start recommendation scenarios. A comprehensive set of experiments on the MovieLens and the Yahoo!R2Music datasets, using several widely applied performance metrics, support our model's theoretically predicted properties and verify that NCDREC outperforms several state-of-the-art algorithms, in terms of recommendation accuracy, diversity and sparseness insensitivity.
Léon Bardalès: Sa vie et son uvre
Ilias Taxidis
Parekbolai : an Electronic Journal for Byzantine Literature , 2011,
Abstract: Cette étude comprend la présentation et l’édition critique de deux lettres et six poèmes de Léon Bardalès qui fut l’un des dignitaires impériaux byzantins de la fin du XIIIe et du début du XIVe siècle. Pour l’occasion, toutes les données concernant l’auteur et son activité politique et littéraire sont réévaluées conformément aux informations fournies par les lettres que Bardalès a re ues d’épistoliers connus de son époque, comme Maxime Planude, Nicéphore Choumnos et Nicéphore Grégoras. Dans l’édition, les erreurs et fautes d’inattention des éditeurs précédents sont corrigées, et un apparat des sources est ajouté.
Socio-Economic Rights: Legally Enforceable or Just Aspirational?
Ilias Trispiotis
Opticon1826 , 2010, DOI: 10.5334/opt.081007
Abstract: Although the Universal Declaration of Human Rights of 1948 cited social welfare rights without distinguishing them from civil and political rights, the separation has been widely accepted by judges, scholars and politicians. Historically, the classification of human rights into two groups, with the relegation of socio-economic rights into a lower category of human rights, emerged and developed mainly after the 1950s during the Cold War and ultimately led to the adoption of two separate UN Covenants, with different formulation and enforcement mechanisms for each set of rights; the causes and purposes of that classification are well-documented (Cranston 1973; Alston 1990; Sadurski 2005) and profoundly political. Scholars and judges have taken significant steps in the last thirty years to cast light on the legal nature of socio-economic rights. Nonetheless, there is still incredulity concerning not only their normative constitutional role, but also their judicial enforceability. Although much ink has been spilt, socio-economic rights are a hot topic again today, due to the current global economic recession and the – often controversial – state actions (or non-actions) that affect the social welfare of millions. Is there any role for the judiciary within this conquered-by-state-policy realm? The goal of this paper is to defend the justiciability of socio-economic rights. To this end, I will present the arguments against their justiciability, after which I will comparatively examine the socio-economic rights jurisprudence, being careful not to get lost in the jurisprudential labyrinth.
The communication by States of International Law to their direct stakeholders
Ilias Bantekas
ACDI : Anuario Colombiano de Derecho Internacional , 2010,
Abstract: From the beginning International law has been conceived as beingbetween states. However, as a result of the progressive development of the law, new actors and new subjects have taken root. The individual is one of these and this has occurred in respect of different perspectives; under the criminal concept the individual may be held responsible before different ad hoc tribunals and the International Criminal Court. Also from the perspective of human rights. This article analyzes the means by which the state’spositions on matters of international law are conveyed toindividuals, corporate entities and other actors.
The mutual agreement procedure and arbitration of double taxation disputes
Ilias Bantekas
ACDI : Anuario Colombiano de Derecho Internacional , 2008,
Abstract: It is in the interest of most states to eliminate double taxation (i.e. the payment of the same tax in two jurisdictions) oftransnational commercial enterprises. Because such disputes involve, on the one hand, the state imposition of taxes, a right universally asserted by all states, and private entities on the other, taxation disputes between such parties are not, on their face, easily susceptible to arbitration. This article analyzes two disputesettlement procedures-the OECD First Model Tax Convention and a similar EU Convention-with the exclusive focus on disputes relatingto the imposition of double taxation. It will look at the ways in which state roles may vary under these procedures from assisting inthe negotiation process to taking a part similar to, but with important differences from, diplomatic protection on behalf of an affected enterprise. The article will examine the situations under which the settlement procedure is required and/or available, how the procedures are triggered, the obligations and parts played bythe parties, the means by which the disputes are resolved (from negotiations to tribunals) and the limitations of the procedures. Are they “taxpayer friendly”? As a result the reader may draw comparisons between the two procedures. Finally, the article will look at the proposed OECD Arbitration Clause which is intended to be incorporated into Article 25 of the OECD Model Tax Convention as well as how thesemechanisms relate and/or conflict with bilateral tax treaties and theGATS.
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