Διπλωματικές εργασίες
Μόνιμο URI για αυτήν τη συλλογήhttps://repository2024.ihu.gr/handle/123456789/30484
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Πλοήγηση Διπλωματικές εργασίες ανά Συγγραφέα "Georgiadis, Apostolos"
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Τεκμήριο Implementation and Simulation of a MIMO System's Physical Layer(Τ.Ε.Ι. Κεντρικής Μακεδονίας, 2014-05) Mastoris, Alexandros; Μάστορης, Αλέξανδρος; Georgiadis, Apostolos; Γεωργιάδης, Απόστολος; Σχολή Τεχνολογικών Εφαρμογών, Τμήμα Μηχανικών Πληροφορικής Τ.Ε.; Master’s Degree in Communication and Information SystemsThe objectives of this thesis are the presentation of the fundamental notions of Multiple Input Multiple Output (MIMO) systems and the creation of models simulating their behaviour. The principal target through this process is to provide Bit-Error-Rate (BER) diagrams in order to derive conclusions about the performance of such systems, especially in comparison to typical Single Input Single Output (SISO) systems in multipath fading environments, namely to prove that the employment of more antennas leads to enhanced results. Emphasis is placed on the so called “Space-Time Block Coding” (STBC) technique, a method that affords full diversity and requires straightforward linear operations at the transmission and reception side. The software used to simulate such systems is Simulink-MATLAB. Simulink is a block diagram environment for multidomain simulation and Model-Based design. It affords the ability to model and analyze systems whose exits vary in time. Various signal modulations (BPSK, QPSK, 8PSK, 16QAM) are employed. However, before performing the simulations, a comprehensive analysis of the most significant notions and guiding principles of wireless digital communications was considered essential to be presented so as to provide the reader with the necessary knowledge and a solid grounding in MIMO communication systems. In the conclusion we discuss the future of Multiple Input Multiple Output systems and recommend alterations and further explorations that could lead to the construction of more efficient and enhanced wireless communication systems.Τεκμήριο Mobile Application & Back-End Server Management Tools for Hotel Reservations(Τ.Ε.Ι. Κεντρικής Μακεδονίας, 2014-05) Giasafakis, Konstantinos D.; Γιασαφάκης, Κωνσταντίνος Δ.; Georgiadis, Apostolos; Γεωργιάδης, Απόστολος; Σχολή Τεχνολογικών Εφαρμογών, Τμήμα Μηχανικών Πληροφορικής Τ.Ε.; Master’s Degree in Communication and Information SystemsThis project aims at creating a flexible Online Reservation System through a mobile plat-form application which can be used by a small or medium (Small to Medium Enterprises-SME) hotel. With the introduction and the evolution of mobile operation systems (such as Android) , mobile applications, and of the World Wide Web of course, online transactions are now very popular and prove to be more reliable than the traditional manual file systems since they speed up the booking process and reduce the problems of duplicate bookings. Nowadays a great part of the population owns a Smartphone and over 60 per cent of that part owns an Android Smartphone. This fact combined with the ubiquity of web servers makes android applications very popular and easy to use from a prospective client who wants to make a fast, easy and reliable reservation, and attracts the attention of many com-mercial entities. The travel and tourism industry in particular, is very popular with regard to making online reservations from mobile applications for hotel rooms, airline seats, etc. This new system should enable guests to make reservations from anywhere around the world from their android mobile smartphone. The implementation of this mobile reservation system is designed to replace the current, to eliminate the problems faced by the manual fil-ing system used by the hotel and provide a continuous and direct contact and relationship between client and hotel. Developing software systems is becoming more common today and developers always search for ways to develop systems faster and to eliminate the problem of repetitive code in the development process. This can be achieved by using application frameworks. Application frameworks (usually named development environments) are collections of abstract classes that are adapted and extended to create application systems. They help by reducing the amount of code that had to be written when developing an application system. Frameworks take all the complexities of interacting with the operating system and simplify them for the user. Eclipse, a full Java integrated development environment (IDE) with advanced features for developing, debugging, and packaging Android applications, was used in our case in or-der to develop the hotel’s android application.