<p>A process for the analysis and collection of information of software systems has been defined. It extracts relevant information of project source files from an online repository and stores that meta-information in a database for further processing. Then, according to the meta-information in the database, it downloads the source files and writes the feedback information back to the database as well. Now the data can be used as input for various analysis tools, in our case a tool called VizzAnalyzer, which reads the project source code and performs a series of software quality analyses.</p><p>But actually, the process, which is mentioned above needs, a lot of manual work, makes the work inefficient and the analysis of large numbers of projects impossible.</p><p>Thus, a series of thesis projects has been devised to automate the whole process. This thesis aims at automating the information extraction and source file download work, which will make the latter preparation of the analysis task much easier and more efficient.</p>

Το έγγραφο είναι μια έρευνα του υποσυστήματος πολυμέσων διαδικτυακού πρωτοκόλλου και μια υλοποιήση ενός περιβάλλοντος προσομοίωσης, γνωστό ως testbed, που βασίζεται σε αυτό το πρωτόκολλο. Στην αρχή γίνεται μια εισαγωγή στην έννοια του IMS. Στο δεύτερο κεφάλαιο, περιγράφουμε τη γενική αρχιτεκτονική του IMS. Στο τρίτο κεφάλαιο, υπάρχει αναφορά στο επίπεδο σηματοδοσίας και όλα τα στοιχεία του. Στο τέταρτο κεφάλαιο περιγράφουμε τις υπηρεσίες που παρέχει το IMS και την αρχιτεκτονική του Open IMS Core που αποτελεί το περιβάλλον προσομοίωσής μας. Τέλος, αναλύουμε τα βήματα με σκοπό να εγκαταστήσουμε τον Open IMS Core ρησιμοποιώντας το λειτουργικό σύστημα Linux. / The script is a research of the Internet Protocol Multimedia Subsystem (IMS) and an implementation of a simulation environment, known as testbed and based on this protocol. In the beginning, there is an introduction to the meaning of IMS.In chapter two, we describe the general architecture of IMS. In chapter three, there is a reference to the signalling level and all of its elements. In chapter four we describe the services that IMS provides and the architecture of the Open IMS Core which is our simulation environment. Finally, we analyse the steps in order to install Open Ims Core using Linux operating system.

Το αντικείμενο αυτής της διπλωματικής εργασίας είναι η μελέτη της δομής υπηρεσιών πάνω στα 0ίκτυα Επόμενης Γενιάς (Next Generation Networks, NGN). Συγκεκριμένα, περιγράφεται η αρχιτεκτονική IMS (IP Multimedia Subsystem) πάνω στην οποία βασίζεται η δομή των 0ικτύων Επόμενης Γενιάς. Στα πλαίσια της παρούσας διπλωματικής εργασίας γίνεται αρχικά μια σύντομη αναφορά στο ιστορικό δημιουργίας του IMS, ενώ στην συνέχεια γίνεται μια εκτεταμένη περιγραφή του μοντέλου και του τρόπου λειτουργίας του IMS. Συγκεκριμένα, αναλύονται οι οντότητες και τα σημεία αναφοράς από τα οποία αποτελείται το IMS καθώς και τα πρωτόκολλα που χρησιμοποιεί. Στη συνέχεια γίνεται μία αναφορά στην ασφάλεια του IMS, όπου αναφέρονται πιθανοί κίνδυνοι και απειλές για το IMS καθώς και τρόποι αντιμετώπισής τους. Έπειτα, παρουσιάζονται και περιγράφονται αναλυτικά οι υπηρεσίες που μπορεί να προσφέρει το IMS στα πλαίσια των 0ικτύων Επόμενης Γενιάς. Τέλος, γίνεται παρουσίαση ενός παραδείγματος εφαρμογής της υπηρεσίας VoIP πάνω από την IMS αρχιτεκτονική. Για την υλοποίηση αυτού του παραδείγματος χρησιμοποιήθηκε το πρόγραμμα προσομοίωσης OPNET 10.0, ενώ συλλέχθηκαν αποτελέσματα σχετικά με τη συμπεριφορά του πρωτοκόλλου SIP και της υπηρεσίας VoIP σε IMS περιβάλλον. / The objective of this diploma thesis is the study of the service structure of Next Generation Networks (NGN). Especially, the IMS architecture (IP Multimedia Subsystem) is being described, which the NGN structure is based on. Initially, there is a quick reference to the history of the development of IMS, and continually an extensive description is being made about the model and the functional mode of IMS. Next, security aspects of IMS are being described, and continually there is a presentation about the services that IMS offers. Finally, an example is being presented regarding the application of VoIP service using the IMS architecture. For the configuration of this example, the simulation program OPNET 10.0 was used, while results were collected regarding the behavior of SIP protocol and VoIP service in the IMS environment.

Η παρούσα διπλωματική εργασία είναι η υλοποίηση σε λογισμικό του Home Subscriber Server (HSS). Ο HSS είναι ένας εξυπηρετητής ζωτικής σημασίας για το IP Multimedia Subsystem (IMS). Αποτελεί την κύρια βάση του δικτύου που περιέχει σημαντικές πληροφορίες για τους χρήστες και επιτελεί, μαζί με κάποιες άλλες οντότητες,την πιστοποίηση και την εξουσιοδότηση των χρηστών, που επιθυμούν να χρησιμοποιήσουν το IMS δίκτυο. / This thesis is the software implementetion of a Home Subscriber Server (HSS). The HSS is a server vital for IP Multimedia Subsystem (IMS). It is the main basis of the network which contains important information for users and it performs, along with some other entities, certification and authorization of users who wish to use the IMS network.

A process for the analysis and collection of information of software systems has been defined. It extracts relevant information of project source files from an online repository and stores that meta-information in a database for further processing. Then, according to the meta-information in the database, it downloads the source files and writes the feedback information back to the database as well. Now the data can be used as input for various analysis tools, in our case a tool called VizzAnalyzer, which reads the project source code and performs a series of software quality analyses. But actually, the process, which is mentioned above needs, a lot of manual work, makes the work inefficient and the analysis of large numbers of projects impossible. Thus, a series of thesis projects has been devised to automate the whole process. This thesis aims at automating the information extraction and source file download work, which will make the latter preparation of the analysis task much easier and more efficient.

The statistics claim, that people who are not physically active live shorter and they are ill more often. Only an individual physical activity is useful. For choosing the right activity the doctors have to investigate the patient, analyse and store his data for the future.The aim of this work was to describe mathematically the integral estimation model, using the model of physical load effect. We created the information subsystem of human functional state model for individual person using the convolution of Meally and Moore automata. The result is the applied program for the consumer – physiologist. This subsystem can be used in e – health for modeling the virtual doctor.

Terrestrial salamanders of the genus Plethodon are among many vertebrates possessing both main olfactory and vomeronasal systems, which the Volatility Theory posits are for detection of volatile and soluble olfactory cues, respectively. Further recent work showing a high amount of convergence between the two olfactory subsystems at the level of the central nervous system suggests complementary or overlapping roles for them. This study examined the use of the olfactory subsystems in prey detection from the perspectives of behaviour and neurobiology. Red-backed salamanders, Plethodon cinereus, were observed in standardized behavioural assays with both volatile and soluble prey olfactory cues. Naïve salamanders showed an increase in nosetapping as well as a side preference in the presence of soluble and volatile prey cues when tested in a 22°C day/20°C night room. In a 15°C day /12°C night room, salamanders increased nosetapping in the presence of soluble prey cues. Salamanders showed a pattern of responses that differed based on their previous experience with the assay, as well as the temperature of the testing room. Attempts to study the neurobiology of olfactory function in Plethodon shermani were inconclusive up to this point, but future directions are discussed. This study shows the importance of olfaction in prey detection by salamanders and that prey searching behaviour is exhibited in the exclusive presence of olfactory cues.

Thesis (Ph. D.)--Florida State University, 2004. / Advisor: Dr. Kathleen Burnett, Florida State University, School of Information Studies. Title and description from dissertation home page (viewed Jan. 13, 2005). Includes bibliographical references.

Thesis (Ph. D.)--University of Pittsburgh, 1992. / Includes bibliographical references (leaves 221-229).

Acessos simultâneos gerados por Elementos de Processamento (EP) contidos nos Sistemas em Chip (SoC) para um único canal de memória externa coloca desafios que requerem uma atenção especial por constituírem o gargalo para o desempenho de processamento. No caso em que os EPs são microprocessadores, a questão fica ainda mais evidente, pois a taxa de aumento da velocidade dos microprocessadores excede a taxa de aumento da velocidade da DRAM. Ambas aumentam exponencialmente, mas a expoente dos microprocessadores é maior do que a das memórias. Este efeito é denominado de “muro de memória” (Memory Wall) e representa que o gargalo de processamento está relacionado à diferença de velocidade. Neste cenário, novas estratégias de controle de acesso são necessárias para melhorar o desempenho. Plataformas heterogêneas de processamento multimídia são formadas por diversos EPs. Os acessos con- correntes à regiões de memória não contíguas em uma DRAM reduzem a largura de banda e aumentam a latência de acesso aos dados, degradando o desempenho de processamento. Esta tese mostra que a eficiência computacional pode ser melhorada com o uso de um fluxo de projeto centralizado em memória, ou seja, orientado para os aspectos funcionais da DRAM. Neste trabalho é apresentado um subsistema de memória com gerenciamento adaptativo de compar- tilhamento do canal de memória entre múltiplos clientes. Esta tese apresenta a arquitetura de um controlador de memória com comportamento predizível que faz a avaliação do pior caso de execução para as transações solicitadas pelos clientes em tempo de execução. Um modelo baseado em atrasos é utilizado para prever os piores casos para o conjunto de clientes. O sub-sistema de memória centraliza a comunicação de dados e gerencia os acessos dos diversos EPs do sistema, de forma que a comunicação seja atendida de acordo com as necessidades de cada aplicação. São apresentadas três contribuições principais: 1) um método de projeto de sistemas integrados centralizado em memória, que orienta o projeto para os aspectos funcionais da me- mória compartilhada; 2) um modelo baseado em atrasos para estimar o pior caso de execução do sistema, quanto aos tempos de resposta e largura de banda mínima alocada por cliente; 3) um árbitro adaptativo para gerenciamento dos acessos à memória externa com garantias de prazos de execução das transações. / The number of Processing Elements (PE) contained in a System-on-Chip (SoC) follows the growth of the number of transistors per chip. A SoC composed of multiple PEs, in some ap- plications such as multimedia, implements algorithms that handle large volumes of data and justify the use of an external memory with large capacity. External memory accesses are shared by multiple PEs adding challenges that may have special attention because they constitute the bottleneck for performance and relevant factor for power consumption. In the case where the PEs are microprocessors, this issue becomes even more evident as the rate of increase of speed of microprocessors exceeds the rate of increase in speed of DRAM. This effect is called “mem- ory wall” and represents that the bottleneck processing is related to the speed of data access. In this scenario, new access control strategies are needed to improve processing performance. Heterogeneous platforms for multimedia processing are formed by several PEs. The concur- rent accesses to DRAM reduce bandwidth and increase latency access to data, degrading the processing performance. This thesis shows that significant improvements in computational effi- ciency can be obtained using a design methodology oriented to the functional aspects of DRAM through a memory subsystem with adaptive management. It is presented the data communica- tion architecture for integration of PEs system based on an analytical model to reduce latency and guarantee Quality of Service (QoS). The memory subsystem is organized as a hierarchy of memories, with a proposed integration of PEs oriented centered in the main memory. The memory subsystem centralized data communication and manages the access of several PEs sys- tem so that communication is served according to the needs of each application. This thesis proposes three major contributions: 1) a methodology for design integrated systems based on the memory-centric design approach, 2) an analytical model based on delays used to evaluate the worst-case performance of the memory subsystem, 3) an arbiter for adaptive management of accesses to the external memory with guaranteed execution times of transactions.