Quality Of Service Enhancement In Ip Based Networks Using Diffserv

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2003Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003Bu çalışmada, Diffserv mimarisi ile internet üzerinde servis kalitesi sağlama tartışılmıştır. Son on yılda IP tabanlı internette servis kalitesi sağlanamıyordu. İnternette bugün sağlanabilen tek servis ‘Best Effort (BE)’ adı verilen servistir. Yani, ağ, herhangi bir paketi hedefine ulaştırırken mümkün olan en verimli yolu kullanır ancak herhangi bir garanti ya da kaynak ayırımı yapmaz. Başka bir deyişle, trafik mümkün olduğu kadar hızlı ve herhangi bir zaman sınırı ya da miktar açısından garanti verilmeden işlenir. İnternetin ticari bir yapıya bürünmesiyle ‘Servis Kalitesi’ sağlanma ihtiyacı daha da artmıştır. Bu ihtiyaç farklı mimarilerin doğmasına yol açmıştır: IntServ ve DiffServ olmak üzere.Tez çalışmasında DiffServ mimarisi problem ve avantajlarıyla ele alınmıştır. Son bölümde ise NS2 ağ simulasyon yazılımı kullanılarak DiffServ implementasyonları yapılmış sonuçları karşılaştırmalı olarak verilmiştir.In this study improving Quality of Service (QoS) on the Internet with DiffServ architecture is discussed. Within the past decade, it is certainly not support for Quality of Service (QoS) over the IP-based ubiquitous Internet. The Internet as it stands today only support one service class called -Best-Effort (BE) Service. The network would make an earnest attempt to deliver packets to their destinations but with no guarantees and/or special resources allocated for any of the packets. With another words, traffic is processed as quickly as possible but there is no guarantee as to timeliness or actual delivery or even how much can be delivered (i.e. throughput). With the rapid transformation of the Internet into a commercial infrastructure, demands for Quality of Service (QoS) have rapidly developed. This need was resulted to different architectures: IntServ and DiffServ. In the study some DiffServ implementations are discussed with their problems and gains. At the last section with using NS2 simulation programming language some DiffServ implementations are given with the compared results.Yüksek LisansM.Sc

Υλοποίηση Ιδιωτικών και Δημόσιων Δικτύων 5ης Γενιάς

Τα δίκτυα πέμπτης γενιάς (5G) αποτελούν μία από τις σημαντικότερες τεχνολογικές εξελίξεις στον τομέα των τηλεπικοινωνιών, καθώς επιτρέπουν τη μετάδοση μεγαλύτερου όγκου δεδομένων σε χαμηλότερο χρόνο απόκρισης και διευκολύνουν την επικοινωνία μεταξύ συσκευών. Με την εισαγωγή των δικτύων 5G, αναμένεται να δημιουργηθούν νέες δυνατότητες και ευκαιρίες σε πολλούς διαφορετικούς τομείς όπως η υγεία ή η βιομηχανία. Επίσης, οι τεχνολογίες του 5G μπορούν να ενισχύσουν την αυτοματοποίηση και την επικοινωνία μεταξύ μηχανών βελτιώνοντας την απόδοση, την παραγωγικότητα και την ασφάλεια. Σημαντικό παράγοντα στην εξέλιξη των δικτύων 5G αποτελεί το Διαδίκτυο των Πραγμάτων (IoT) το οποίο αναφέρεται σε ένα δίκτυο συνδεδεμένων συσκευών και αντικειμένων που επιτρέπουν την ανταλλαγή δεδομένων και την αλληλεπίδρασή τους μεταξύ τους μέσω του Διαδικτύου. Οι συσκευές IoT μπορούν να συνδεθούν και να αλληλοεπιδράσουν μεταξύ τους, ανταλλάσσοντας δεδομένα και επιτρέποντας τη λήψη αποφάσεων και την αυτόματη εκτέλεση ενεργειών. Υπάρχουν διάφορα πεδία σύγκλισης μεταξύ αυτών των δύο τεχνολογιών. Ένα από αυτά είναι η αυξημένη συνδεσιμότητα καθώς το 5G παρέχει ανώτερη ταχύτητα και χωρητικότητα, καθώς και χαμηλή καθυστέρηση, που επιτρέπει την αποτελεσματική συνδεσιμότητα για μεγάλο αριθμό συσκευών IoT. Σημαντικά επίσης πεδία σύγκλισης αποτελεί η ανάπτυξη προηγμένων εφαρμογών και οι λειτουργίες διαχείρισης ενέργειας από τις συσκευές IoT. Επίσης, το 5G παρέχει τη δυνατότητα υλοποίησης τόσο δημόσιων όσο και ιδιωτικών δικτύων. Τα δημόσια δίκτυα 5G είναι ευρέως προσβάσιμα δίκτυα που παρέχουν κινητή τηλεφωνία και διαδικτυακές υπηρεσίες σε ευρύ κοινό, ενώ τα ιδιωτικά δίκτυα 5G είναι δίκτυα που υλοποιούνται για ειδικές εφαρμογές και αποκλειστική χρήση από μια οργάνωση ή μια ομάδα οργανώσεων. Η παρούσα εργασία παρέχει αρχικά μια εκτενή βιβλιογραφική μελέτη των δικτύων 5ης γενιάς και του Διαδικτύου των Πραγμάτων (IoT) καθώς και ορισμένων σημαντικών εφαρμογών που προκύπτουν από την σύγκλιση των δύο. Στη συνέχεια, έχει ως στόχο την παρουσίαση μιας μελέτης υλοποίησης ενός Ιδιωτικού δικτύου 5ης γενιάς και των εφαρμογών ΙοΤ που μπορεί να υποστηρίξει. Πιο συγκεκριμένα, αναλύεται η περίπτωση της Έξυπνης Γεωργίας στον Θεσσαλικό κάμπο μέσα από την χρήση μιας IoT πλατφόρμας (ThingSpeak) που μπορεί να εκτελέσει όλες τις λειτουργίες που απαιτούνται για την καλύτερη κατανόηση του τομέα αυτού.The fifth-generation (5G) networks represent one of the most significant technological advancements in the telecommunications industry, enabling the transmission of larger volumes of data with lower latency and facilitating communication between devices. With the introduction of 5G networks, new possibilities and opportunities are expected to arise in various sectors such as healthcare and industry. Additionally, 5G technologies can enhance automation and machine-to-machine communication, improving performance, productivity, and security. A crucial factor in the evolution of 5G networks is the Internet of Things (IoT), which refers to a network of interconnected devices and objects that enable data exchange and interaction through the Internet. IoT devices can connect and interact with each other, exchanging data and enabling decision-making and automatic execution of actions. There are several areas of convergence between these two technologies. One of them is increased connectivity, as 5G provides superior speed and capacity, as well as low latency, enabling efficient connectivity for a large number of IoT devices. Other significant areas of convergence include the development of advanced applications and energy management functions by IoT devices. Furthermore, 5G enables the implementation of both public and private networks. Public 5G networks are widely accessible networks that provide mobile telephony and internet services to the general public, while private 5G networks are implemented for specific applications and exclusive use by an organization or a group of organizations. This thesis initially provides an extensive literature review of 5G networks and the Internet of Things (IoT), as well as some important applications resulting from the convergence of the two. It then aims to present a case study on the implementation of a private 5G network and the IoT applications it can support. Specifically, the case of Smart Agriculture in the Thessalian plain is analyzed through the use of an IoT platform (ThingSpeak) capable of performing all the required functions for a better understanding of this field

UML-SOA-Sec and Saleem’s MDS Services Composition Framework for Secure Business Process Modelling of Services Oriented Applications

In Service Oriented Architecture (SOA) environment, a software application is a composition of services, which are scattered across enterprises and architectures. Security plays a vital role during the design, development and operation of SOA applications. However, analysis of today’s software development approaches reveals that the engineering of security into the system design is often neglected. Security is incorporated in an ad-hoc manner or integrated during the applications development phase or administration phase or out sourced. SOA security is cross-domain and all of the required information is not available at downstream phases. The post-hoc, low-level integration of security has a negative impact on the resulting SOA applications. General purpose modeling languages like Unified Modeling Language (UML) are used for designing the software system; however, these languages lack the knowledge of the specific domain and “security” is one of the essential domains. A Domain Specific Language (DSL), named the “UML-SOA-Sec” is proposed to facilitate the modeling of security objectives along the business process modeling of SOA applications. Furthermore, Saleem’s MDS (Model Driven Security) services composition framework is proposed for the development of a secure web service composition