Εσωτερικός έλεγχος, επιχειρηματική στρατηγική κι εταιρική μεταρρύθμιση

Η διατριβή αφορά τον τρόπο με τον οποίο τα σύγχρονα μοντέλα εσωτερικού ελέγχου των επιχειρήσεων οδηγούν στην διαμόρφωση της στρατηγικής των επιχειρήσεων, αλλά και πώς το αποτέλεσμα των στρατηγικών αυτών οδηγεί μία επιχείρηση στην εσωτερική μεταρρύθμιση της λειτουργίας της, των στόχων που θέτει, του ανθρωπίνου δυναμικού και των ρόλων που αυτό έχει, την λειτουργία έναντι πιστωτών και χρεωστών, αλλά και έναντι του κρατικού μηχανισμούΗ διατριβή αφορά τον τρόπο με τον οποίο τα σύγχρονα μοντέλα εσωτερικού ελέγχου των επιχειρήσεων οδηγούν στην διαμόρφωση της στρατηγικής των επιχειρήσεων, αλλά και πώς το αποτέλεσμα των στρατηγικών αυτών οδηγεί μία επιχείρηση στην εσωτερική μεταρρύθμιση της λειτουργίας της, των στόχων που θέτει, του ανθρωπίνου δυναμικού και των ρόλων που αυτό έχει, την λειτουργία έναντι πιστωτών και χρεωστών, αλλά και έναντι του κρατικού μηχανισμο

Thymic pathology and cardiac myxomas: Coincidence or a closer relationship?

Myxomas are the most common benign cardiac tumors and are located more frequently in the left atrium. In the literature there are cases describing the coexistence of thymic tumors and cardiac myxomas. In the case reported herein, during the resection of a cardiac myxoma, an enlarged thymus gland was encountered and resected. The histological exam revealed a thymic hyperplasia. The aim of this case study is to assess the need of conducting further studies in order to identify a common histological pathway between thymic lesions and cardiac myxomas. The diagnosis of a cardiac myxoma could justify a further workup of the anterior mediastinum in order not to overlook a lesion of thymic origin

Mediastinal debulking for a T-cell leukaemia/lymphoma presenting with cardiac tamponade

Anterior mediastinal masses are relatively uncommon and include a wide variety of lesions. Lymphomas account for 25% of anterior mediastinal masses. Lymphomas and other haematological malignancies are associated with pericardial effusion. There are also cases where a cardiac tamponade occurred. The aim of the case reported herein is to discuss the surgical approach and particularly the mediastinal debulking as an adjunct to systematic treatment for haematological diseases presenting as an anterior mediastinal mass responsible for a cardiac tamponade

Unpublished Mediterranean and Black Sea records of marine alien, cryptogenic, and neonative species

To enrich spatio-temporal information on the distribution of alien, cryptogenic, and neonative species in the Mediterranean and the Black Sea, a collective effort by 173 marine scientists was made to provide unpublished records and make them open access to the scientific community. Through this effort, we collected and harmonized a dataset of 12,649 records. It includes 247 taxa, of which 217 are Animalia, 25 Plantae and 5 Chromista, from 23 countries surrounding the Mediterranean and the Black Sea. Chordata was the most abundant taxonomic group, followed by Arthropoda, Mollusca, and Annelida. In terms of species records, Siganus luridus, Siganus rivulatus, Saurida lessepsianus, Pterois miles, Upeneus moluccensis, Charybdis (Archias) longicollis, and Caulerpa cylindracea were the most numerous. The temporal distribution of the records ranges from 1973 to 2022, with 44% of the records in 2020–2021. Lethrinus borbonicus is reported for the first time in the Mediterranean Sea, while Pomatoschistus quagga, Caulerpa cylindracea, Grateloupia turuturu, and Misophria pallida are first records for the Black Sea; Kapraunia schneideri is recorded for the second time in the Mediterranean and for the first time in Israel; Prionospio depauperata and Pseudonereis anomala are reported for the first time from the Sea of Marmara. Many first country records are also included, namely: Amathia verticillata (Montenegro), Ampithoe valida (Italy), Antithamnion amphigeneum (Greece), Clavelina oblonga (Tunisia and Slovenia), Dendostrea cf. folium (Syria), Epinephelus fasciatus (Tunisia), Ganonema farinosum (Montenegro), Macrorhynchia philippina (Tunisia), Marenzelleria neglecta (Romania), Paratapes textilis (Tunisia), and Botrylloides diegensis (Tunisia).peer-reviewe

Almería 1147-Tesalónica 1185: estudio comparativo de dos conquistas a través de las fuentes escritas

In the middle of the 12th century, Pope Eugene III proclaimed the Second Crusade, which took place in the Iberian Peninsula, Asia Minor and the Holy Land, and in northeastern Europe. The campaign in the Peninsula was launched against Muslim Almeria and involved the peninsular Christian kingdoms and the Italian republics of Genoa and Pisa. The main source of information on the Christian conquest of Almeria is the text of the Genoese admiral and participant in the campaign, Caffaro, and secondly the Chronicle of the reign of Alfonso VII. On the other hand, the Islamic sources, although more numerous, offer little content. In the last quarter of the same century another campaign was carried out on the eastern side of the Mediterranean by the Norman kingdom of Sicily and Apulia against the Eastern Roman Empire. The Sicilian invasion of 1185 ended with the fall and brief occupation of Thessaloniki, the second most important city of the empire. The archbishop of the city, Eustathius, as an eyewitness, provides a lot of information about the events of the conquest, while the work of Choniates is complemented with information about the general campaign and the Byzantine counterattack. Both conquests caused definitive repercussions in the Mediterranean zone.A mediados del siglo XII, el Papa Eugenio III proclamó la Segunda Cruzada, que tuvo lugar en la Península Ibérica, Asia Menor y Tierra Santa, y en el noreste de Europa. La campaña en la Península se lanzó contra la Almería musulmana e involucró a los reinos cristianos peninsulares y las repúblicas italianas de Génova y Pisa. La principal fuente de información sobre la conquista cristiana de Almería es el texto del almirante genovés y participante en la campaña, Caffaro, y en segundo lugar la Crónica del reinado de Alfonso VII. Por otro lado, las fuentes islámicas, aunque más numerosas, ofrecen poco contenido. En el último cuarto del mismo siglo se llevó a cabo otra campaña en el lado oriental del Mediterráneo por el reino normando de Sicilia y Apulia contra el Imperio romano de Oriente. La invasión siciliana de 1185, terminó con la caída y la ocupación breve de Tesalónica, la segunda ciudad más importante del imperio. El arzobispo de la ciudad, Eustacio, como testigo presencial, nos brinda mucha información sobre los hechos de la conquista, mientras que el trabajo de Choniates se complementa con información sobre la campaña general y el contraataque bizantino. Ambas conquistas provocaron definitivas repercusiones en la zona mediterránea

Μορφές αποδόμησης στο έργο του Θανάση Βαλτινού: Προς έναν ορισμό του ελληνικού μεταμοντέρνου

Αυτή εργασία επιτρέπει την κατανόηση των μεταμοντέρνων πλευρών του λογοτεχνικού έργου του Θανάση Βαλτινού, καθώς επίσης και τη σύνδεση ανάμεσα στην ελληνική ιστορία και τα θεωρητικά κινήματα του 20ού αιώνα. Η κατακερματισμένη δομή, οι μορφολογικοί πειραματισμοί και η συνεχής παρουσία της παρωδίας μαρτυρούν τη σχέση μεταξύ του Βαλτινού και των θεμελιωδών αρχών του μεταμοντέρνου και προβάλλουν τη σημασία του προσωπικού βιώματος (ναζιστική κατοχή της Ελλάδας, εμφύλιος πόλεμος, ψυχροπολεμική περίοδος) ως μιας εναλλακτικής ιστορίας. Συμπερασματικά, εξετάζεται πως το μεταμοντέρνο κίνημα επηρέασε την ελληνική μεταπολεμική λογοτεχνία, μολονότι η ιστορική και κοινωνική πραγματικότητα υπήρξε στην Ελλάδα αρκετά διαφορετική.This study provides an understanding of postmodernist aspects in Thanasis Valtinos’ work and the association between Greek literary history and theoretical movements of the 20th century. The fragmented structure, the morphological experimentations and the constant presence of the parody testify the connection between Valtinos and the primary principles of postmodernism as well as display the importance of the individual experience (Axis occupation of Greece, civil war, cold war period) as an alternative history. In conclusion, it is considered that the postmodernist movement has affected the Greek postwar literature, although the historical and social reality in Greece was quite different

Experimental and technical evaluation of evaporative cooling devices

125 σ.Στην διπλωματική εργασία γίνεται παρουσίαση και πειραματική αξιολόγηση της εξατμιστικής ψυκτικής μονάδας με αρχή λειτουργίας τον κύκλο του Maisotsenko. Αναφορά στους τρόπους εξατμιστικής ψύξης – άμεση, έμμεση και συνδυασμός αυτών – και στην λειτουργία τους. Πείραμα, κατά το οποίο ελήφθησαν μετρήσεις της θερμοκρασίας, της υγρασίας και της ταχύτητας του αέρα πριν και μετά την demo μονάδα που χρησιμοποιήθηκε σ' αυτό. Υπολογιστική επίλυση του κύκλου του Maisotsenko και ειδικότερα της demo μονάδας ψύξης με την βοήθεια του προγράμματος Mathcad. Σύγκριση και αξιολόγηση των αποτελεσμάτων.The thesis deals with the presentation and experimental evaluation of evaporative cooling unit operating principle cycle Maisotsenko. Reference to Evaporative cooling methods - direct, indirect and their combination - and in their operation. Experiment, in which measurements of temperature, humidity and air velocity were taken before and after the demo unit used. Computational solution of Maisotsenko cycle and specifically of the demo cooling unit with the use of Mathcad. Comparison and evaluation of results.Ιωάννης Θ. Μωραϊτη

The Electricity Market in Greece: Current Status, Identified Challenges, and Arranged Reforms

The approach of an integrated electricity market is widespread across Europe, since such a market structure has numerous benefits for both the grid and consumers. The current structure and the related policy framework of the electricity markets adopted within the European countries is based on a benchmark model, the so-called Target Model, which describes a reference energy market framework. In this paper, a comprehensive overview of the legislative effort and the resulting Target Model is provided, aiming to set the basis for the description of the adopted electricity markets in Europe. In a second stage, the current status of the Greek electricity market that operates under the Target model scheme is given via the analysis of the involved submarkets, i.e., the forward market, the day-ahead market, the intraday market, and the balancing market. An intricate case study of the Target Model operation in the Greek electricity market within a day of operation is examined, which actually completes the former description. Within the case study, the Greek electricity market is further investigated for its efficiency and the impact on the obtained electricity prices from the first day of the Target Model implementation, which took place in November 2020, and, finally, today is analysed. The results show an overall successful implementation and satisfactory performance of the Target Model in Greece, with an important main result being the reduction of prices in the balancing market and the increase of the intraday market liquidity. However, several challenges are identified and described in detail, while at the same time measures for their confrontation are proposed in order to improve market operation and fully exploit the benefits of the Target Model

Coordinating Capacity Calculation via Electricity Market Coupling: Insights from the H2020 CROSSBOW Project

CROSS BOrder management of variable renewable energies and storage units enabling a transnational Wholesale market (CROSSBOW) is an EC-funded project, whose aim is to facilitate the shared use of energy resources by fostering cross-border management of variable renewable energies and storage units, enabling higher penetration of renewable energy sources (RES) whilst reducing network operational costs and improving economic benefits of clean energies and storage units. Towards these goals, CROSSBOW boosts regional cooperation among the system operators in Southeastern Europe (SEE), by deploying nine different tools to support the security coordination center (SCC) of the region. More specifically, the main CROSSBOW product, namely CROSSBOW Regional Operation Centre (CROSSBOW ROC) has proposed and demonstrated a set of functionalities for regional management and operation that enhance the existing regional structures, extending the capabilities of the already established Regional Security Coordinator (RSC) initiatives. Beyond enhancing RSC mandatory functions (including adequacy forecasts, coordinated security analysis, capacity calculations, and outage planning coordination), the ROC-BC product has developed new functions, linking the security considerations of involved TSOs with the operation of the fast-developing and harmonized electricity markets. In this paper, we investigate approaches for coordinated capacity calculation and cross-border trading via market coupling, developed within the ROC-BC product of CROSSBOW. Moreover, we present the final demonstration results as a part of ROC fundamental functionalities. Specifically, both net transfer capacity (NTC) and flow-based (FB) methods are examined and compared within a case study applying to the SEE region. The presented results demonstrate that the FB method exhibits better performance in all examined scenarios, considering three different key performance indicators (KPIs)