Organizational aspects of ICT applications in cultural heritage “Virtual Museum” context: the permanent challenge of reconciliation of diverging scientific, technical, operational and financial objectives

[EN] The applications of ICT in the cultural heritage field are including a new expanding category of applications, having a “creative” character, and a multidisciplinary approach. Motivations and priorities of involved players (individuals and organizational players), are presented, through various FHW paradigm projects, in order to explore the possible impact of this kind of projects in science and cultural heritage concept, as well as to explore their hidden added value, that makes them capable to attract resources.[ES] Las aplicaciones de las Tecnologías de la Información y la Comunicación en el patrimonio cultural comprenden una nueva categoria de acciones, con un caracter creativo, y un concepto multidisciplinario. Este trabajo sirve para presentar las motivaciones y prioridades de los actores involucrados (individuos o instituciones), que participan en estos proyectos, para examinar en base a estos las posibles consecuencias de estos proyectos en el concepto mismo de ciencia y patrimonio cultural, al mismo tiempo que se explora también su oculto valor añadido, valor este que les puede permitir atraer nuevos recursos.Giannoulis-Giannoulopoulos, G. (2012). Organizational aspects of ICT applications in cultural heritage “Virtual Museum” context: the permanent challenge of reconciliation of diverging scientific, technical, operational and financial objectives. Virtual Archaeology Review. 3(7):8-13. https://doi.org/10.4995/var.2012.4370OJS81337ECONOMOU, M. & PUJOL TOST, L. (2007): "Evaluating the impact of new technologies on cultural heritage visitors", in J. MacLoughin, K. Kaminski, B Sodagar (eds). Technology strategy, management and socio-economic impact, heritage management series, vol. 2, Budapest, Archaeolingua.FHW (2007): Ancient Agora, Visual reconstruction of the ancient Agora of Athens. http://project.athens-agora.gr/FHW (2007): THOLOS the dome shaped theater of FHW. http://tholos254.grFOUCAULT, Michel (1969): L'Archeologie du savoir. Paris, Gallimard.PLANTZOS, D. & DAMASKOS, D. (eds.) (2008): "A Singular Antiquity", MOUSEIO BENAKI 3rd supplement, proceedings of the conference entitled "Archaeology, Antiquity and Hellenicity in twentieth century Greece".SIDERIS, A. (2008): "Recontextualised Antiquity: Interpretative VR Visualization of Ancient Art and Architecture", in Makropoulos T. A. and Papachristos N. M. (eds), Proceedings: International Symposium on "Information and Communication Technologies in Cultural Heritage", Ioannina, 16- 18/10/2008 (Ioannina 2008), pp. 159-176.UNESCO (2003): Convention for the Safeguarding of the Intangible Cultural Heritage.Σίδερης Α., (2008): "Συγκείμενα, ερμηνείες και αφήγηση ιστοριών σε εικονικά αρχαιολογικά ̟εριβάλλοντα", Πρακτικά της ημερίδας ΑφήγησηΙστοριών (Storytelling) σε Αρχαιολογικά Εικονικά Περιβάλλοντα, 25/11/2008 Αθήνα, Ελληνικός Κόσμος, (online publication)

Ανάπτυξη και αξιολόγηση συνελικτικών νευρωνικών δικτύων για την κατηγοριοποίηση ιατρικών εικόνων

Στην παρούσα διπλωματική εργασία εκθέτουμε τα βασικά στοιχεία της θεωρίας των νευρωνικών δικτύων με έμφαση στα συνελικτικά νευρωνικά δίκτυα και με κύριο σκοπό μας τη μελέτη της κατηγοριοποίησης ιατρικών εικόνων. Πιο συγκεκριμένα χρησιμοποιήθηκαν εικόνες καρκίνου του μαστού που αφορούν σε πορογενές διηθητικό καρκίνωμα, οι οποίες επιθυμούμε να διαχωριστούν σε θετικές και αρνητικές στην ύπαρξη όγκου. Η υλοποίηση του αλγόριθμου βασίζεται στην τεχνολογία των συνελικτικών νευρωνικών δικτύων (ΣΝΔ) με μεγάλο βάθος. Τα ΣΝΔ παίρνουν ως είσοδο εικόνες και ανακαλύπτουν συγκεκριμένες πληροφορίες ή χαρακτηριστικά από τα δεδομένα, χωρίς ανθρώπινη παρέμβαση για το τι θεωρούμε σημαντικό για να διαχωριστούν οι εικόνες στις κατηγορίες που ανήκουν. Τα ΣΝΔ μπορούν να έχουν διάφορες αρχιτεκτονικές με διαφορετικό βάθος, διαφορετικό πλήθος συνελίξεων, διαφορετικές συναρτήσεις ενεργοποίησης και πολλές άλλες παραμέτρους και τεχνολογίες. Συνεπώς τα τελευταία χρόνια μεγάλος όγκος έρευνας γίνεται για την ανακάλυψη αρχιτεκτονικών που είναι οι πλέον κατάλληλες για την κατηγοριοποίηση ιατρικών εικόνων. Στην παρούσα εργασία διερευνούμε ποιοτικά εννέα τροποποιήσεις σε μια βραβευμένη αρχιτεκτονική συνελικτικών δικτύων, την VGG16. Σκοπός μας είναι να βελτιώσουμε την ακρίβεια στην κατηγοριοποίηση της συγκεκριμένης κατηγορίας εικόνων, άλλα παράλληλα να κατανοήσουμε βαθύτερα τις δομικές παραμέτρους της αρχιτεκτονικής των ΣΝΔ, για ταχύτερη και πλέον αξιόπιστη εκπαίδευση αντίστοιχων δικτύων για παρόμοια προβλήματα. Επίσης εξετάζουμε τη μεταφοράς γνώσης από ήδη εκπαιδευμένα δίκτυα σε διαφορετικού είδους προβλήματα ώστε να βελτιώσουμε την ακρίβεια στο προαναφερθέν πρόβλημα που πραγματεύεται η παρούσα εργασία.In this diploma thesis we present basic elements of neural network theory with emphasis on convolutional neural networks (CNN) with the main aim of studying the categorization of medical images. In particular, breast cancer images of the Invasive Ductal Carcinoma (IDC). This form of breast cancer consists of 80% of the cases of breast cancer. We aim to separate given images of tissue regarding to being positive or negative on IDC. The implementation of the algorithms used, is based on the technology of CNN that exhibit a greater depth than used to be applied. CNN technology makes it possible to take a picture as input and discover specific information or features from the data the network deems important in order to separate the images into pre-specified categories that the images belong without any human input as to what differentiates the categories. CNNs come in very different architectures, with different depth, different plurality of convolutions, different activation functions as well as many other technologies and techniques. In recent years, therefore, a great deal of research has been made to discover the most suitable architectures. In the present study we qualitatively and quantitative explore 9 modifications to an award-winning neural network architecture, the VGG16. Our aim is to evaluate various structural and quality parameters of a CNN in relation with how should we train such networks for better and faster results. Also, we focus on the transfer of knowledge from already trained networks which solved a different set of problems

Popliteal artery damage during total knee arthroplasty

AbstractInjury of popliteal artery during total knee arthroplasty is a relatively rare complication. We report on one case of transverse semi-dissection of the popliteal artery during the tibial cut and one case of popliteal pseudoaneurysm formation caused by Hohmann retractors. Diagnosis was made early in the first case but it was delayed in the second due to misdiagnosis of deep vein thrombosis. Both injuries were managed eventually by open surgery. Postoperative clinical examination and ultrasound imaging confirmed the successful restoration of the blood flow. This case report also describes the classification system of the type of vascular damage and describes the mechanism, the clinical presentation, diagnostic modalities and treatment options for these rare complications of total knee arthroplasty surgery

The first Anatomy professors in the Medical School of the University of Athens

The purpose of this historical review is to add new elements to the international literature in relation to the birth and progress of the science of anatomy in modern Greece. Step by step, it outlines the efforts of prominent Greek anatomists to establish the course of the basic science of anatomy in the newly founded Medical School, the laborious effort to collect cadaveric material, to compile museum anatomical collections and to gradually build the foundations of modern anatomy science at the Medical School of the Athenian University

The first Anatomy professors in the Medical School of the University of Athens

The purpose of this historical review is to add new elements to the international literature in relation to the birth and progress of the science of anatomy in modern Greece. Step by step, it outlines the efforts of prominent Greek anatomists to establish the course of the basic science of anatomy in the newly founded Medical School, the laborious effort to collect cadaveric material, to compile museum anatomical collections and to gradually build the foundations of modern anatomy science at the Medical School of the Athenian University

What Ukraine Taught NATO about Hybrid Warfare

Russia’s invasion of Ukraine in 2022 forced the United States and its NATO partners to be confronted with the impact of hybrid warfare far beyond the battlefield. Targeting Europe’s energy security, Russia’s malign influence campaigns and malicious cyber intrusions are affecting global gas prices, driving up food costs, disrupting supply chains and grids, and testing US and Allied military mobility. This study examines how hybrid warfare is being used by NATO’s adversaries, what vulnerabilities in energy security exist across the Alliance, and what mitigation strategies are available to the member states. Cyberattacks targeting the renewable energy landscape during Europe’s green transition are increasing, making it urgent that new tools are developed to protect these emerging technologies. No less significant are the cyber and information operations targeting energy security in Eastern Europe as it seeks to become independent from Russia. Economic coercion is being used against Western and Central Europe to stop gas from flowing. China’s malign investments in Southern and Mediterranean Europe are enabling Beijing to control several NATO member states’ critical energy infrastructure at a critical moment in the global balance of power. What Ukraine Taught NATO about Hybrid Warfare will be an important reference for NATO officials and US installations operating in the European theater.https://press.armywarcollege.edu/monographs/1952/thumbnail.jp

Impact of safety-related dose reductions or discontinuations on sustained virologic response in HCV-infected patients: Results from the GUARD-C Cohort

BACKGROUND: Despite the introduction of direct-acting antiviral agents for chronic hepatitis C virus (HCV) infection, peginterferon alfa/ribavirin remains relevant in many resource-constrained settings. The non-randomized GUARD-C cohort investigated baseline predictors of safety-related dose reductions or discontinuations (sr-RD) and their impact on sustained virologic response (SVR) in patients receiving peginterferon alfa/ribavirin in routine practice. METHODS: A total of 3181 HCV-mono-infected treatment-naive patients were assigned to 24 or 48 weeks of peginterferon alfa/ribavirin by their physician. Patients were categorized by time-to-first sr-RD (Week 4/12). Detailed analyses of the impact of sr-RD on SVR24 (HCV RNA <50 IU/mL) were conducted in 951 Caucasian, noncirrhotic genotype (G)1 patients assigned to peginterferon alfa-2a/ribavirin for 48 weeks. The probability of SVR24 was identified by a baseline scoring system (range: 0-9 points) on which scores of 5 to 9 and <5 represent high and low probability of SVR24, respectively. RESULTS: SVR24 rates were 46.1% (754/1634), 77.1% (279/362), 68.0% (514/756), and 51.3% (203/396), respectively, in G1, 2, 3, and 4 patients. Overall, 16.9% and 21.8% patients experienced 651 sr-RD for peginterferon alfa and ribavirin, respectively. Among Caucasian noncirrhotic G1 patients: female sex, lower body mass index, pre-existing cardiovascular/pulmonary disease, and low hematological indices were prognostic factors of sr-RD; SVR24 was lower in patients with 651 vs. no sr-RD by Week 4 (37.9% vs. 54.4%; P = 0.0046) and Week 12 (41.7% vs. 55.3%; P = 0.0016); sr-RD by Week 4/12 significantly reduced SVR24 in patients with scores <5 but not 655. CONCLUSIONS: In conclusion, sr-RD to peginterferon alfa-2a/ribavirin significantly impacts on SVR24 rates in treatment-naive G1 noncirrhotic Caucasian patients. Baseline characteristics can help select patients with a high probability of SVR24 and a low probability of sr-RD with peginterferon alfa-2a/ribavirin

Efficient implementation of filtering and resampling operations on Field Programmable Gate Arrays (FPGAs) for Software Defined Radio (SDR)

In Software Defined Radios a good portion (or even the entirety) of the modulation and demodulation processes is performed in the digital domain. The data rate of the transmitted information is very important, since efficiency is a key requirement in real time implementations and cost increases considerably with the number of samples per second to be processed. In this thesis, we address the problem of efficient design of the resampling operations, so that they can be implemented on Field Programmable Gate Arrays (FPGAs). A set of filtering and resampling operations is developed in the Simulink environment through Xilinx/Simulink blocksets, where all the included subsystems of the design are fully accessible by the designer in any stage of operation. The key ingredient is the use of a Multiplier and Accumulator (MAC) architecture, which can be either time multiplexed for maximum hardware efficiency, or run on a parallel structure for maximum time efficiency.http://archive.org/details/efficientimpleme109453847Hellenic Navy autho

Insights into involuntary hospital admission procedures for psychiatric patients: A 3-year retrospective analysis of police records

The procedure of involuntary hospitalization has been an ongoing subject of study. Its implementation requires the systematic co-ordination between the Justice and Health Care systems around the globe. In the case of Greece, the procedure under discussion is regulated by Law 2071/1992, which designates the Police as the agent that links the aforementioned systems together. The present study aims to shed light upon the procedure of involuntary hospitalizations, regarding the preparatory stage and the Police involvement up to the individuals’ admission to the on-call hospital for a mental health assessment (MHA). The entry data of two police stations in Athens was recorded by the respective Duty Officer responsible for each case. The police records were retrospectively inspected and information on socio-demographic, clinical and parametric characteristics was extracted. The data collection took place between March and July 2020 and included 324 cases, 80.3% of which referred to involuntary hospitalizations; 17.6% of sample cases did not meet the criteria of the procedure, as opposed to 1.9% of the cases in which the patients eventually ended up being voluntarily admitted and afterwards hospitalized for treatment. There was a statistically comparison of socio-demographic, clinical and parametric variables in relation to the status of hospitalization groups (involuntary, voluntary and no hospitalization). Additionally, statistical comparisons were made between parametric and clinical variables in relation to the type of prosecution order (written: standard route, oral: emergency route). Acute mental health deterioration accounted for around 45% of the total data and it has been identified as the main factor for informing the Hearings Prosecutor office mainly by the patient’s family and subsequently proceeding to the issuance of an order (in either written or oral form) to the Police. This enables the Police to escort the individuals and lead them to a psychiatric unit for mental health assessment (MHA) and based on this, for involuntary hospitalization if deemed necessary. In 87.9% of the cases, the individual was transported by police vehicles over a time span ranging from the very same day to 22 days. In total, the written prosecution orders (63.6%) outnumbered the oral ones (36.7%). The findings of the present study demonstrate that the Prosecution order type varies significantly depending on the causes that instigated the involuntary hospitalization procedure. The psychiatric decision whether there should be hospitalization or outpatient therapy also significantly varies depending on the diagnosis. Lastly, the results point out that the need for improvement and further clarification of the aforementioned Greek Law is absolutely essential