Η παρούσα εργασία καταγράφει τη μελέτη και τις λύσεις που δημιουργήθηκαν για το σχεδιασμό, την κατασκευή και την εγκατάσταση μιας υπηρεσίας απομακρυσμένης διαχείρισης συστημάτων και δικτύου για λογαριασμό του Πανελληνίου Σχολικού Δικτύου (ΠΣΔ) και συγκεκριμένα τη δημιουργία του συστήματος OpenRSM το οποίο συγκεντρώνει καινοτόμα χαρακτηριστικά για τα δεδομένα του κλάδου του ανοικτού λογισμικού. Η δημιουργία της υπηρεσίας αυτής αποτέλεσε την αφετηρία για τη μελέτη του χώρου των πληροφοριακών συστημάτων απομακρυσμένης διαχείρισης και για την ανεύρεση και κατασκευή λύσεων γενικού σκοπού που να μπορεί να καλύπτει πρακτικά όλες τις διαχειριστικές απαιτήσεις, με το ελάχιστο κόστος. Συγκεκριμένα, η εμπειρία που αποκομίστηκε από τα εμπορικά συστήματα απομακρυσμένης διαχείρισης και την εφαρμογή τους στο ΠΣΔ οδήγησε στην ιδέα, στον σχεδιασμό και την υλοποίηση του ευέλικτου συστήματος απομακρυσμένης διαχείρισης OpenRSM. Αντίστοιχη εμπειρία σχετικά με τις υπηρεσίες διαχείρισης και χρέωσης εκτυπωτικών και φωτοτυπικών υπηρεσιών οδήγησαν στην δημιουργία του καινοτόμου συστήματος KOYIAMI. Αφετηρία για την εργασία υπήρξε η ανάγκη για εγκατάσταση μιας υπηρεσίας σε κλίμακα δηλαδή σε μεγάλο αριθμό από σχολικά εργαστηριακά περιβάλλοντα. Η χρήση εμπορικού λογισμικού παρουσίασε πολλά προβλήματα και στην ανάγκη κατάλληλων, μη τετριμμένων λύσεων που βασίστηκαν σε εργασίες ολοκλήρωσης και ανάπτυξης. Η υλοποίηση της υπηρεσίας υπήρξε προβληματική τόσο σε επιχειρησιακό όσο και σε τεχνικό επίπεδο. Αν και βασίστηκε σε κορυφαίες κατά τεκμήριο λύσεις λογισμικού στον τομέα της ολοκληρωμένης επιχειρησιακής διαχείρισης συστημάτων και δικτύου, Enterprise Management Systems (EMS), υπήρξε δύσκολη η εγκατάσταση σε κλίμακα ανάλογη του μεγέθους του ΠΣΔ. Παράλληλα, το κόστος των συστημάτων λογισμικού υπήρξε δεσμευτικό για την συνέχεια των προσπαθειών στα πλαίσια των αντίστοιχων έργων. Η τελική λύση που δόθηκε προέκυψε από την συλλογή συμπερασμάτων για τις απαιτήσεις που διέπουν τις εγκαταστάσεις κλίμακας και τις απομακρυσμένες εγκαταστάσεις. Τα συμπεράσματα συνέκλιναν στο γεγονός ότι όσο η κλίμακα μεγαλώνει, οι επιχειρησιακές διαδικασίες είναι περισσότερο καθοριστικές όχι μόνο για την αποτελεσματικότητα, αλλά και για την ίδια τη βιωσιμότητα των λύσεων. Επίσης, οι σωστές διαδικασίες είναι απαραίτητο να υποστηρίζονται από αντίστοιχες τεχνικές λύσεις. Στην περίπτωση της υπηρεσίας απομακρυσμένης διαχείρισης απαιτήθηκε σημαντική προσπάθεια σε επιχειρησιακό και τεχνικό επίπεδο για να επιτευχθεί το τελικό αποτέλεσμα. Χρειάστηκε να αποσαφηνιστούν οι σωστές αρχές για τη διαχείριση και κυρίως την εγκατάσταση κλίμακας, να αναγνωριστούν οι κατάλληλες επιχειρησιακές διαδικασίες που θα καθιστούσαν τη λύση βιώσιμη και να δημιουργηθούν οι αντίστοιχες τεχνικές λύσεις σε επίπεδο ολοκλήρωσης και διαμόρφωσης των πακέτων εγκατάστασης καθώς και σε επίπεδο δικτυακής διαμόρφωσης. Η εμπειρία που αποκομίστηκε οδήγησε στη διερεύνηση του κλάδου το ελεύθερου λογισμικού ανοικτού κώδικα (ΕΛ/ΛΑΚ) προκειμένου να αναγνωριστούν εργαλεία τα οποία θα μπορούσαν να αποδώσουν με μηδενικό πρακτικά κόστος λειτουργικότητα αντίστοιχη με αυτή ενός EMS. Η διερεύνηση είχε ως αποτέλεσμα τη διαπίστωση ότι, παρότι τα εργαλεία διαχείρισης αποτελούν βασικό αντικείμενο ανάπτυξης και παρότι διατίθεται πληθώρα λογισμικών εντούτοις, μέχρι τη στιγμή που η διερεύνηση διενεργήθηκε, δεν υπήρχε κάποια προσπάθεια για την ολοκλήρωση ή την οργάνωση των διαδικασιών της διαχείρισης μέσα από ενιαίο, ολοκληρωμένο πληροφοριακό σύστημα κατά τα πρότυπα των EMS. Το σύστημα OpenRSM αναπτύχθηκε προκειμένου να καλύψει ακριβώς αυτό το κενό. Η μελέτη που προηγήθηκε της δημιουργίας του συστήματος κατέγραψε τις πιο αξιόλογες λύσεις ΕΛ/ΛΑΚ που θα μπορούσαν να ολοκληρωθούν στο σύστημα και χρησιμοποίησε την εμπειρία από την υλοποίηση της υπηρεσίας απομακρυσμένης διαχείρισης του ΠΣΔ προκειμένου να καταλήξει στην πιο ευέλικτη αρχιτεκτονική για το σύστημα καθώς και τις γενικές αρχές που θα έπρεπε να διέπουν τη λειτουργία του οι οποίες συνοψίζονται σε μέγιστη κλιμάκωση, μέγιστη ευκολία στην εγκατάσταση, διαδικτυακή λειτουργία, μέγιστη χρηστικότητα, ανεξαρτησία από λειτουργικά συστήματα και επεκτασιμότητα. Το σύστημα βασίζεται στον σχεδιασμό φορμαλιστικού πλαισίου για την προδιαγραφή και την διεκπεραίωση διαχειριστικών λειτουργιών οι οποίες μπορούν να αξιοποιούν τη λειτουργικότητα ανεξάρτητων τμημάτων λογισμικού που ολοκληρώθηκαν στο σύστημα είτε αναπτύχθηκαν για αυτό. Τέτοια λειτουργικότητα αφορά το σύστημα διαχείρισης διαθεσίμων, παρακολούθησης δικτύου, διαχείριση λογισμικού, διαχείριση επιφάνειας εργασίας, ανακάλυψης σταθμών εργασίας. Το πλαίσιο της λογικής του συστήματος υλοποιείται ως εξυπηρετητής διαχείρισης που ολοκληρώνει τις υπηρεσίες το συστήματος και που είναι ικανό να εκθέτει λειτουργικότητα προς τα υπόλοιπα τμήματα του συστήματος τα οποία είναι η γραφική διαχειριστική κονσόλα χρήστη και ο agent που εγκαθίσταται στους υπό διαχείριση σταθμούς εργασίας. Το σύστημα ΟpenRSM δοκιμάστηκε σε πιλοτικές εγκαταστάσεις σε φορείς όπως η Διεύθυνση Οργάνωσης Λειτουργίας των Κέντρων Εξυπηρέτησης Πολιτών, το Σώμα Ελεγκτών Επιθεωρητών της Δημόσιας Διοίκησης και η Νομαρχιακή Αυτοδιοίκηση Αχαΐας, ενώ εξετάστηκε ενδελεχώς ως προς τη δυνατότητά του να εξυπηρετεί φορτίο ανάλογο των πόρων που του διατίθενται. Η εξέλιξη του συστήματος το επέκτεινε προς διάφορες ενδιαφέρουσες κατευθύνσεις και συγκεκριμένα προς την ολοκλήρωση με λύσεις για την υλοποίηση τεχνολογιών πλέγματος, όπως η περίπτωση της πλατφόρμας LiveWN η οποία είναι δυνατό, όπως έδειξε αντίστοιχη μελέτη, να διανεμηθεί μέσω του OpenRSM σε μεγάλες υποδομές όπως το ΠΣΔ χρησιμοποιώντας πλήρως αυτοματοποιημένες διαδικασίες. Αντίστοιχη μελέτη έδειξε ότι είναι δυνατός ο αυτοματοποιημένος έλεγχος ασύρματων δικτύων αισθητήρων που βασίζονται στο σύστημα ΤinyOS. Το σύστημα TinyOS μπορεί με εύκολο τρόπο να ολοκληρωθεί στο OpenRSM, να διανεμηθεί και να χρησιμοποιηθεί για τη δημιουργία δικτύων αισθητήρων. Το σύστημα ΟpenRSM έχει επεκταθεί προς τον έλεγχο ενσωματωμένων συσκευών που χρησιμοποιούνται σε ενεργά στοιχεία ασύρματων δικτύων, προς την κατεύθυνση της χρήσης μεσισμικού ενώ έχει μελετηθεί διεξοδικά η ασφάλειά του. Στη συνέχεια της εργασίας παρουσιάζεται ένα πρόβλημα αντίστοιχο με αυτό της διαχείρισης συστημάτων και δικτύου στο ΠΣΔ, το οποίο αφορά τη βιώσιμη διαχείριση των εκτυπωτικών υπηρεσιών στην Ακαδημαϊκή Βιβλιοθήκη του Πανεπιστημίου Κρήτης. Διαπιστώθηκε ότι και στην περίπτωση των συστημάτων διαχείρισης εκτυπωτικών υπηρεσιών δεν διατίθεται ΕΛ/ΛΑΚ σύστημα ικανό να προσφέρει ολοκληρωμένη λύση και έτσι αναπτύχθηκε το σύστημα KOYIAMI το οποίο καταφέρνει να αποδώσει βιώσιμη, παραγωγική λειτουργία για την πίστωση, εξυπηρέτηση και χρέωση εκτυπώσεων και φωτοτυπιών. / This thesis elaborates on the study and the solutions developed for the design, manufacture and installation of a remote service for network and systems management for the Greek School Network. This work was the starting point for the study of the area of information systems and remote management for finding and building general-purpose solutions that can cover practically all the management requirements at minimum cost. The experience gained from commercial remote management systems and their application in Greek School Network led to the idea, design and implementation of the flexible remote management system OpenRSM. Relevant experience in management and billing services for copiers and printing infrastructures led to the creation of innovative system KOYIAMI. The starting point for the work was the need to install a management service in a large number of school laboratory stations. The use of commercial software faced problems and demanded non-trivial solutions that needed to based on integration and development work. The implementation of the service was problematic both from the operational and technical perspective. Although based on leading software solutions in integrated enterprise systems and network management it has been difficult to install on the scale size of the Greek School Network. Furthermore, the cost of software systems was binding on the continuation of efforts. The final solution resulted from the deduction and the satisfaction of the most fundamental requirements that govern installations of scale and remote installations. The findings converged on the fact that as the scale grows, the business processes are more crucial not only for efficiency but also the very viability of solutions. Also, proper procedures need to be supported by relevant technical solutions. In the case of our remote management service we clarifies the sound principles for managing the scaled installation procedures, identifies the appropriate operational procedures that would make the solution viable and constructed solutions based on integration of open source software, configuration packages and network. Our experience has led us explore the industry in the field of free and open source software in order to identify tools that could accommodate pieces of enterprise management systems functionality and practically cost zero. The investigation resulted in the finding that, although administrative and management tools are fundamental tools for the practice of development and maintenance in a professional level and although there are many pieces of software available, by the time the investigation was conducted there was no effort to integrate the organization or management processes through a single, integrated information system along the lines of an high-end enterprise management system. We thus developed OpenRSM to fill this gap. The study that preceded the creation of the system scrutinized the market for the most valuable open source solutions that could be integrated. We also exploited the experience from the implementation of the remote management service in the Greek School Network in order to design a system that would provide flexible architecture, maximum scalability, maximum ease of installation, operational over the internet, maximum usability, and independence from operating systems. The design of the system was based on a formalistic framework for specifying and processing corporate functions that utilize the functionality of independent software components. Such functionality includes to the system of assets management, network monitoring, software distribution, desktop management, station discovery. The basic system logic is implemented as a management server that orchestrates the execution of the integrated components thus exposing functionality to the rest of the architectural components of the system that is, the graphical management console user and the agent installed on the managed workstations. The system was tested in pilot installation at agencies such as the Department of Organization of Operation Centers for Citizen Service, the House of Inspectors and Auditors of Public Administration and the Prefecture of Achaia. It was thoroughly examined for its ability to serve load with respect to the resources available. The evolution of the system has been extended to a number of interesting directions; it was used to prove that it can facilitate the creation of Glite-based grid technologies through the usable distribution of the LiveWN platform that automatically produces worker nodes for the HellasGrid ifrastructure. A similar case study showed that it is possible automated control of wireless sensor networks based on TinyOS system. The TinyOS system can easily be integraded into OpenRSM, distributed and used for managing networked sensors. The OpenRSM has also been expanded to control embedded devices used in wireless networks active elements and towards the use of using JAVA-based. It was also extensively tested for its safety. Our thesis also presents a problem similar to the management of systems and network in the Greek School Network, that of sustainable management of printing services in the Academic Library of the University of Crete. It was found that for the management of printing services there are also no integrated open source systems that are to provide complete solutions; thus we developed another innovative system system, KOYIAMI, which manages to deliver sustainable, productive operation for credit, services and printing and photocopying costs.

Mit HylaFAX+ wurde eine gute Grundlage für eine neue Faxlösung an der Technischen Universität Chemnitz gefunden. Durch die vielen Schnittstellen, die HylaFAX+ bietet, konnte es um fehlende Funktionen erweitert werden, sodass es den gestellten Anforderungen entspricht. Auf Basis dieser Arbeit, kann unter Berücksichtigung der Richtlinien des URZ, eine neue Faxlösung implementiert werden, welche den XMediusFAX-Server ablöst. Das FoIP-Gateway nimmt E-Mails entgegen und verarbeitet diese inklusive Anhang, dieser kann eine PDF, ein Word Dokument oder ein Bilddokument in den Formaten JPEG oder PNG sein. Bevor das Fax abgesendet wird, setzt ein Skript die richtige Faxnummer des Absenders ein und prüft ob der Absender die nötigen Rechte hat um ein Fax intern/national/international zu versenden. Die eigentliche Übertragung des Faxes erfolgt über das T.38 Protokoll, sollte der Empfänger dieses nicht beherrschen, wechselt die Faxlösung automatisch auf die Pass-Through Methode. Ist das Fax erfolgreich übertragen, erhält der Sender eine Sendebestätigung per E-Mail oder Ausdruck. Wird eine Faxnachricht empfangen, wird noch vor während der Rufannahme geprüft ob der Empfänger innerhalb des Universitätsnetzes existiert. Falls es die Empfängernummer nicht gibt, wird der Anruf augenblicklich beendet. Ist die Faxnummer einem Nutzer zugeordnet, ermittelt ein Pythonskript die E-Mailadresse des Empfängers. Dieser erhält die Faxnachricht anschließend als PDF im Anhang einer E-Mail. Sollte im LDAP ein Drucker hinterlegt sein bekommt der Nutzer einen Ausdruck auf dem eingestellten Drucker.

Thesis (MA (Information Science. Socio-Informatics))--Stellenbosch University, 2009. / Open-source software is not something new; however, it has come into the spotlight in the last few years, mostly due to hyped initial cost savings of the Linux operating system. Consumers and businesses were made aware of shortcomings in the traditional proprietary software model and this has in turn created a surge in popularity of open-source. The migration to open-source requires efficient research of options available and thorough analysis of the migratory process through all levels of the organization. Initial independent cost analysis has not been conclusive, with unreliable, skewed results and below average performance due to poor implementation. The focus of this study is whether open-source software is a suitable alternative to current proprietary software packages utilized by the government sector.

In scientific applications, physical quantities and units of measurement are used regularly. If the inherent incompatibility between these different units is not handled properly it can lead to major, and sometimes catastrophic, problems. Although the risk of a miscalculation is high and the cost equally so, almost no programming languages has support for physical quantities. Instead developers often rely on external libraries to help them spot these mistakes or prevent them all together. There are several hundred of these types of libraries, spread across multiple sites and with no simple way to get an overview. No one has summarized what has and has not been achieved so far in the area leading to many developers trying to ‘reinvent the wheel’ instead of building on what has already been done. This shows a clear need for this type of research. Employing a systematic approach to look through and analyze all available physical quantity libraries, the search results were condensed into 82 libraries which are presented in this thesis. These are the most comprehensive and well-developed, open-source libraries, chosen from approximately 3700 search results across seven repository hosting sites. In this group, 30 different programming languages are represented. The goal is for the results of this thesis to contribute to a shared foundation on which to build future libraries as well as provide an easy way of spreading knowledge about which libraries exist in the area, thus making it easier for more people to use them.

With the emergence of connected and autonomous vehicles, sensors are increasingly deployed within car. Traffic generated by these sensors congest traditional intra-vehicular networks, such as CAN buses. Furthermore, the large amount of wires needed to connect sensors makes it hard to design cars in a modular way. These limitations have created impetus to use wireless technologies to support intra-vehicular communication. In this dissertation, we tackle the challenge of designing and evaluating data collection protocols for intra-car networks that can operate reliably and efficiently under dynamic channel conditions. First, we evaluate the feasibility of deploying an intra-car wireless network based on the Backpressure Collection Protocol (BCP), which is theoretically proven to be throughput-optimal. We uncover a surprising behavior in which, under certain dynamic channel conditions, the average packet delay of BCP decreases with the traffic load. We propose and analyze a queueing-theoretic model to shed light into the observed phenomenon. As a solution, we propose a new protocol, called replication-based LIFO-backpressure (RBL). Analytical and simulation results indicate that RBL dramatically reduces the delay of BCP at low load, while maintaining its high throughput performance. Next, we propose and implement a hybrid wired/wireless architecture, in which each node is connected to either a wired interface or a wireless interface or both. We propose a new protocol, called Hybrid-Backpressure Collection Protocol (Hybrid-BCP), for the intra-car hybrid networks. Our testbed implementation, based on CAN and ZigBee transceivers, demonstrates the load balancing and routing functionalities of Hybrid-BCP and its resilience to DoS attacks. We further provide simulation results, obtained based on real intra-car RSSI traces, showing that Hybrid-BCP can achieve the same performance as a tree-based protocol while reducing the radio transmission power by a factor of 10. Finally, we present TeaCP, a prototype Toolkit for the evaluation and analysis of Collection Protocols in both simulation and experimental environments. TeaCP evaluates a wide range of standard performance metrics, such as reliability, throughput, and latency. TeaCP further allows visualization of routes and network topology evolution. Through simulation of an intra-car WSN and real lab experiments, we demonstrate the functionality of TeaCP for comparing different collection protocols.

Submitted by DANIEL SEDA PEREIRA DE MORAES (danielseda@gmail.com) on 2018-08-10T23:13:10Z No. of bitstreams: 1 Daniel-Seda_Origami-e-Robotica_DISSERTACAO-2018.pdf: 22202619 bytes, checksum: e9ba068be30e0b62f8b50a71bba3ea98 (MD5) / Approved for entry into archive by Laura Mariane de Andrade null (laura.andrade@ia.unesp.br) on 2018-08-11T14:42:24Z (GMT) No. of bitstreams: 1 moraes_dsp_me_ia.pdf: 22154827 bytes, checksum: b7f22d7feaf55298d990176bd6c87dba (MD5) / Made available in DSpace on 2018-08-11T14:42:24Z (GMT). No. of bitstreams: 1 moraes_dsp_me_ia.pdf: 22154827 bytes, checksum: b7f22d7feaf55298d990176bd6c87dba (MD5) Previous issue date: 2018-06-18 / Nesta dissertação, eu discuto algumas das relações entre arte, ciência e tecnologia a partir da conexão entre o papel e a eletrônica. O foco da dissertação é como o papel, tecnologia ancestral, pode ganhar outras aplicações, especialmente na arte, ao se conectar a sistemas de código aberto para robótica. O conhecimento teórico e experimental sobre o tema converte-se na produção de uma série de objetos cinéticos apresentados em uma exposição junto com o texto final desta dissertação, que contém também um tutorial abrindo o código das obras realizadas, permitindo a sua replicação por outras pessoas. / In this text, I discuss relations between art, science and technology starting from the connection between paper and electronics. The focus is how paper, ancestral technology, can gain other applications, especially in art, when connecting to open source systems for robotics. Theoretical and experimental knowledge on the subject compose a series of kinetic objects presented in an exposition along with the final text of this dissertation, which also contains a tutorial opening the code of the works carried out, allowing their replication by other people.

Foi desenvolvido um protótipo de hardware de sistema de monitoramento meteorológico como tecnologia aberta e livre e voltado para a ciência cidadã, chamado de Estações Meteorológicas Modulares (EMM). Foram considerados critérios de acessibilidade dos materiais e facilidade de modificação no desenvolvimento do projeto. Todos os programas utilizados no desenvolvimento são softwares livres. Um dos elementos desenvolvidos, a placa de controle das EMM, possibilita medir diferentes parâmetros meteorológicos, além de realizar o registro dados e envio para um servidor. Também possibilita a inclusão de novos sensores. Por todos esses fatores, é considerada satisfatória quanto a sua funcionalidade. A estrutura mecânica das EMM atingiu um patamar de preço acessível a indivíduos e organizações como escolas e associações de moradores de bairro, e apresenta fácil adaptabilidade a diferentes condições de instalação. O custo total do sistema ficou abaixo de alternativas proprietárias amadoras e significativamente abaixo de alternativas proprietárias profissionais. Soluções acessíveis para alguns elementos da EMM ainda requerem testes mais aprofundados. Parte das ferramentas utilizadas na fabricação da placa de controle ainda carece de maior disseminação junto à sociedade para acessibilizar o sistema das EMM. Os registros de desenvolvimento do trabalho foram feitos em forma de documentação aberta por meio de cadernos de laboratório abertos. As atividades de fabricação, montagem e instalação das EMM foram feitas seguindo métodos colaborativos chamados de Encontros de Fabricação Colaborativa e Mutirões das EMM. O resultado deste trabalho, unindo as documentações, os registros dos métodos colaborativos de fabricação, montagem e instalação e as consolidadas oficinas do projeto, é sintetizado no Guia da Comunidade EMM. Este é um roteiro para quem quiser fazer parte e ampliar uma rede de monitoramento ambiental colaborativo com as EMM, e é baseado em atividades educacionais para compreensão dos diferentes elementos da ferramenta e para a emancipação tecnológica. Uma das EMM foi comparada com uma estação automática oficial do Instituto Nacional de Meteorologia (INMET). Nessas comparações, as medidas de temperatura e pressão atmosférica apresentaram diferenças menores do que a acurácia dos sensores, enquanto a umidade relativa do ar apresentou uma diferença acima da acurácia do sensor. Este foi um primeiro passo de validação das EMM. / It was developed the hardware prototype of a meteorological monitoring system as free and open source hardware with focus on citizen science. The system is called Estações Meteorológicas Modulares (EMM, from Portuguese Modular Meteorological Stations). Affordability and reachability of materials and ease of remix were criteria considered in the development of this project. All the programs used in the development are free software. One of the elements developed, the control board of the EMM, is considered satisfactory in terms of: the parameters it enables to measure, the functionalities of communication and register of data, and the possibility of inclusion of new sensors.. The resulting solution to the mechanical structure of the EMM is low cost, affordable to schools and neighborhood associations, and is easy to adapt to different conditions of installation. The whole cost of the system is lower than proprietary amateur alternatives and significantly lower than proprietary professional solutions. Reachable and affordable solutions to some elements of the EMM still need some deeper testing. Some of the tools used to produce the control board still need a broader dissemination among the society in order to ensure the reachability and affordability of the EMM system. The work development registers were made as open documentation by means of open laboratory notebooks. The EMM fabrication, mounting and installations activities were made as collaborative methods called Encontros de Fabricação Colaborativa (from Portuguese, Collaborative Fabrication Gatherings) and Mutirões of the EMM. The result of this work, merging the documentation, the register of collaborative methods of fabrication, mounting and installations, and the consolidated workshops of the EMM project, are synthesized in the EMM Community Guide. This is a script to the ones who want to make part and expand the collaborative environmental monitoring network with the EMM, and it is based in educational activities to comprehend the different elements of the tool and to promote the technological emancipations. One of the EMM was compared to an official automatic meteorological station from Instituto Nacional de Meteorologia (INMET, from Portuguese Meteorology National Institute). In this comparison, the temperature and atmospheric pressure measurements showed differences lower than the accuracy of the sensors used, and the relative air humidity presented a difference higher than the accuracy of the sensor. This was the first step to validate the EMM.

abstract: The following is a case study composed of three workflow investigations at the open source software development (OSSD) based Apache Software Foundation (Apache). I start with an examination of the workload inequality within the Apache, particularly with regard to requirements writing. I established that the stronger a participant's experience indicators are, the more likely they are to propose a requirement that is not a defect and the more likely the requirement is eventually implemented. Requirements at Apache are divided into work tickets (tickets). In our second investigation, I reported many insights into the distribution patterns of these tickets. The participants that create the tickets often had the best track records for determining who should participate in that ticket. Tickets that were at one point volunteered for (self-assigned) had a lower incident of neglect but in some cases were also associated with severe delay. When a participant claims a ticket but postpones the work involved, these tickets exist without a solution for five to ten times as long, depending on the circumstances. I make recommendations that may reduce the incidence of tickets that are claimed but not implemented in a timely manner. After giving an in-depth explanation of how I obtained this data set through web crawlers, I describe the pattern mining platform I developed to make my data mining efforts highly scalable and repeatable. Lastly, I used process mining techniques to show that workflow patterns vary greatly within teams at Apache. I investigated a variety of process choices and how they might be influencing the outcomes of OSSD projects. I report a moderately negative association between how often a team updates the specifics of a requirement and how often requirements are completed. I also verified that the prevalence of volunteerism indicators is positively associated with work completion but what was surprising is that this correlation is stronger if I exclude the very large projects. I suggest the largest projects at Apache may benefit from some level of traditional delegation in addition to the phenomenon of volunteerism that OSSD is normally associated with. / Dissertation/Thesis / Doctoral Dissertation Industrial Engineering 2017

Denna studie har behandlat fri mjukvara ur ideologanalytiskt perspektiv. Studien bygger på en analys av Free Software Foundation, mjukvaruplattformen GNU samt ett forum som främst diskuterar fri mjukvara. Studien har först och främst behandlat ämnet som en social rörelse, och sökt att förstå de ideologiska resonemangen som görs inom rörelsen, för att kunna se vad rörelsen ställer för krav och hur de önskar att världen ”borde vara”. Genom att använda en så kallad ”diskursiv ideologianalys”, så har materialet sållat fram värden, tankar och idéer. Genom materialet har det funnits en idé att undersöka hur de olika delarna tolkar varandra, och hur ideologin har samspelat mellan dem. Dessa har sedan försökts att förstås och problematiserats genom olika ideologiska texter och teorier, i hoppet om att förstå vad för världsbild som faktiskt konstrueras. Men det har också varit av vikt att undersöka om det faktiskt råder en konsensus i det som har funnits, eller om det istället har handlat om ideologiska krockar inom rörelsen.

Submitted by LEANDRO LUIS PAURO null (leapauro@hotmail.com) on 2017-01-04T17:24:14Z No. of bitstreams: 1 DissertaçãoLeandroLuisPauro.pdf: 2663695 bytes, checksum: 2f960384d56a02d82cba4527cfb3d32c (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2017-01-06T13:52:34Z (GMT) No. of bitstreams: 1 pauro_ll_me_sjrp.pdf: 2663695 bytes, checksum: 2f960384d56a02d82cba4527cfb3d32c (MD5) / Made available in DSpace on 2017-01-06T13:52:34Z (GMT). No. of bitstreams: 1 pauro_ll_me_sjrp.pdf: 2663695 bytes, checksum: 2f960384d56a02d82cba4527cfb3d32c (MD5) Previous issue date: 2016-12-06 / Cada vez mais a Computação em Nuvem é incorporada pelas empresas como forma econômica e viável de se disponibilizar recursos e serviços. No entanto, a confiabilidade operacional e a disponibilidade de recurso ainda causam preocupação em virtude de ocorrer a inatividade de algum serviço fornecido pela nuvem, o que pode gerar a perda de receitas e desconfiança do cliente. Assim, é crucial que se disponibilize ferramentas a este ambiente para realizar auditoria e monitoramento, a fim de prover a prevenção e a eliminação de inconsistências que possam provocar a indisponibilidade do serviço oferecido. Este trabalho apresenta a ferramenta de Auditoria e Monitoramento em Nuvem Orquestrador Apache CloudStack AMFC, que através do sincronismo das informações do estado atual com dados persistentes do orquestrador, realiza a eliminação de dados sem utilização e inconsistências, diminui o alertas de falso positivo e falso negativo e também proporciona menor custo para armazenamento de dados persistentes da nuvem. Sua eficácia foi evidenciada através da realização de validação manual comparada com o resultado obtido da execução da ferramenta a partir de casos de uso gerados no ambiente de teste controlado. Os resultados obtidos após a realização de 1.320 rotinas administrativas para instância de máquina virtual mostraram a identificação e eliminação das inconsistências na base de dados persistente, a redução do custo de armazenamento e consequentemente, uma base de dados íntegra, que oferece ao administrador da nuvem uma tomada de decisão com maior precisão para averiguar um problema que esteja ocorrendo no ambiente. / Cloud Computing has been increasingly incorporated by companies as an economic and feasible mean to provide resources and services. However, operational reliability and resource availability are still cause for concern since there's the possibility of a cloud service going down, which can lead to loss of revenue and customer distrust. Thus, it is crucial to provide tools for performing auditing and monitoring in order to prevent and eliminate inconsistencies that may cause the unavailability of the service offered. This paper presents the Cloud Orchestrator Auditing and Monitoring Tool Apache CloudStack AMFC, which by synching information current status with the orchestrator persistent data deletes any unused data and inconsistencies, decreases the false positive and negative alerts and also provides lower cost for cloud persistent data storage. Its effectiveness has been demonstrated through manual validation compared to results obtained from running the tool in a controlled test environment. The results obtained after performing 1.320 administrative tasks for a virtual machine were the identification and elimination of inconsistencies in the persistent database, reducing storage costs and, consequently, resulting in an intact database. This enables the cloud administrator to make more accurate decisions when investigating a possible malfunction in the environment.