Made available in DSpace on 2016-06-02T19:06:08Z (GMT). No. of bitstreams: 1 5466.pdf: 2178593 bytes, checksum: a3777aeb3757d619d7087258728cdde6 (MD5) Previous issue date: 2013-05-20 / Financiadora de Estudos e Projetos / Cloud Computing has potential to revolutionize way that systems are developed and marketed. Among several research gaps related to this new model is the Lock-In. The Lock-In is the difficulty on migrating data and applications from a cloud platform to another. The lack of standardization, as well as other reasons, are causing the problem. This work presents a model-driven(MDE) approach for portability of applications between cloud platforms. With MDE software engineers can work at a high level of abstraction freeing themselves from repetitive tasks related to software implementation and specific details of cloud platforms. Besides portability, MDE brings additional benefits related to traditional software development approaches. The approach presented in this work, basically consists of a DSL and a set of automated transformations for two known cloud platforms Google App Engine and Microsoft Azure. The approach allows the development of cloud applications on a high abstraction level, showing that despite being simple, the elements of the approach are enough to generate many cloud applications, as well as facilitates its development. The evaluation confirms the benefits provided by MDE technologies. / A computação em nuvem tem potencial para revolucionar a maneira como sistemas são desenvolvidos e comercializados. Entre as diversas lacunas de pesquisa relacionados a esse novo modelo computacional está o Lock-In. Isto é, o aprisionamento do usuário ao provedor devido a dificuldade na migração de dados e aplicativos de uma plataforma de nuvem para outra. Tal aprisionamento ocorre, dentre outros motivos, devido a falta de um padrão para desenvolvimento de aplicações para a nuvem. Este trabalho apresenta uma abordagem dirigida por modelos (Model-Driven Engineering - MDE) para portabilidade de aplicações entre plataformas de Computação em nuvem. Com o MDE os engenheiros de software podem trabalhar em um nivel mais alto de abstração livrando-se de tarefas repetitivas de codificação, que ficam a cargo de transformações automatizadas, e ficando assim protegidos das complexidades requeridas para implementação nas diferentes plataformas. Além da portabilidade o MDE traz benefícios adicionais em relação a abordagens tradicionais de desenvolvimento de sistemas. Este trabalho apresenta o desenvolvimento de uma linguagem textual que possibilita a especificação de aplicações em um alto nível de abstração. Bem como geradores de código para duas conhecidas plataforma de nuvem, a Google App Engine(GAE) e a Windows Azure, mostrando que a linguagem desenvolvida pode servir de entrada para a geração de grande parte do código necessário para muitas aplicações de nuvem e que facilita seu desenvolvimento. O MDE oferece uma maior produtividade, melhor manutenção e documentação e reúso. A avaliação realizada observou alguns desses benefícios, o que comprova a viabilidade da abordagem MDE.

När en ny webbapplikation skall lanseras och driftsättas är det svårt att i förhand veta vilken datatrafik och belastning som tjänsten behöver vara dimensionerad för. Rapporten följer en webbapplikation som inte är förberedd för uppskalning till att bli separerad i olika komponenter för ökad skalbarhet och driftsäkerhet. I rapporten genomförs även en komparativ studie på olika typer av molntjänster som erbjuder infrastruktur (IaaS)-, plattform (PaaS)- och mjukvara (SaaS) som en tjänst. Målet med undersökningen var att hitta en kostnadseffektiv metod för att expandera applikationens infrastruktur och flytta implementationen till molnet. Resultatet och slutsatsen visar att den dyraste lösningen inte alltid är den bästa och i slutändan kan företag betalar pengar för resurser som de inte utnyttjar.

This thesis deals with the theme Moving information system in the cloud. The paper first describes the issue theoretically. It is defined and characterized by cloud computing as the current major trend in the implementation of information technology. A description of individual actors and models emerging in cloud computing, its brief history, related technology underlying or expand cloud computing, client issues and reference architecture model. It also includes an analysis of the current state offered cloud services, compared to open source and proprietary solutions, and was implemented insight into the upcoming National Strategy for Cloud Computing The case study move e-mail system to a hosted private cloud is demonstrated by the complexity of the entire process and the rugged environment of government institutions. On the basis of theoretical knowledge and case studies in the last chapter proposes a model that would in general help in deciding whether the institutions of government information systems migrate to cloud computing, which is also in line with the forthcoming national strategy.

L'informatique en nuage (cloud computing) est un paradigme émergent qui révolutionne l'utilisation et la commercialisation des services informatiques. De nos jours, l'impact socio-économique de l'informatique en nuage et plus particulièrement des services de PaaS (plate-forme en tant que service) devient essentiel, puisque le nombre d'utilisateurs et de fournisseurs des cloud PaaS est en pleine croissance. L'objectif principal des fournisseurs de cloud PaaS est de générer le maximum de profit des services qu'ils fournissent. Cela les oblige à faire face à un certain nombre de défis, tels que la gestion efficace des ressources sous-jacentes et la satisfaction des SLAs (contrat de service) des applications hébergées. Dans cette thèse, nous considérons un environnement PaaS hybride de cloud bursting, où le fournisseur PaaS possède un nombre limité de ressources privées et a la possibilité de louer des ressources publiques. Ce choix permet au fournisseur PaaS d'avoir un contrôle complet sur les services hébergés dans les ressources privées et de profiter de ressources publiques pour gérer les périodes de pointe. De plus, nous proposons une solution rentable pour gérer un tel système PaaS sous des contraintes de SLA. Nous définissons une politique d'optimisation de profit qui, à chaque requête d'un nouveau client, évalue le coût d'hébergement de son application en utilisant les ressources publiques et privées et choisit l'option qui génère le plus de profit. Pendant les périodes de pointe la politique considère deux autres options. La première option consiste à emprunter quelques ressources aux applications en cours d'exécution tout en considérant le paiement de pénalités si leur qualité de service est affectée. La seconde option consiste à attendre que des ressources privées soient libérés tout en considérant le paiement de pénalités si la qualité de service de la nouvelle application est affectée. En outre, nous avons conçu et mis en œuvre une architecture de cloud PaaS, appelée Meryn, qui intègre la politique d'optimisation proposée, supporte le cloud bursting et héberge des applications du type batch et MapReduce. Les résultats de notre évaluation montrent l'efficacité de notre approche dans l'optimisation du profit du fournisseur. En effet, comparée à une approche de base, notre approche fournit jusqu'à 11.59 % et 9.02 % plus de profits pour le fournisseur dans respectivement les simulations et les expériences. / Cloud computing is an emerging paradigm revolutionizing the use and marketing of information technology. As the number of cloud users and providers grows, the socio-economical impact of cloud solutions and particularly PaaS (platform as a service) solutions is becoming increasingly critical. The main objective of PaaS providers is to generate the maximum profit from the services they provide. This requires them to face a number of challenges such as efficiently managing the underlying resources and satisfying the SLAs of the hosted applications. This thesis considers a cloud-bursting PaaS environment where the PaaS provider owns a limited number of private resources and is able to rent public cloud resources, when needed. This environment enables the PaaS provider to have full control over services hosted on the private cloud and to take advantage of public clouds for managing peak periods. In this context, we propose a profit-efficient solution for managing the cloud-bursting PaaS system under SLA constraints. We define a profit optimization policy that, after each client request, evaluates the cost of hosting the application using public and private resources and chooses the option that generates the highest profit. During peak periods the optimization policy considers two more options. The first option is to take some resources from running applications, taking into account the payment of penalties if their promised quality of service is affected. The second option is to wait until private resources become available, taking into account the payment of penalties if the promised quality of service of the new application is affected. Furthermore we designed and implemented an open cloud-bursting PaaS system, called Meryn, which integrates the proposed optimization policy and provides support for batch and MapReduce applications. The results of our evaluation show the effectiveness of our approach in optimizing the provider profit. Indeed, compared to a basic approach, our approach provides up to 11.59% and 9.02% more provider profit in, respectively, simulations and experiments.

This thesis discusses the new way of delivering IT services over the Internet widely known as cloud computing. In its opening part, cloud computing is put into a historical context of the evolution of enterprise computing, and the dominant issues the IT department faces today are mentioned. Further, the paper deals with several components that make up the architecture of cloud computing and reviews the benefits and drawbacks an enterprise can have while it adopts this new model. One of the primary aims of this thesis is to identify the impact of the technology trends on cloud computing. The thesis brings together four major computing trends, namely virtualization, multi-tenant architecture, service-oriented architecture and grid computing. Another aim is to focus on two trends related to IT infrastructure that will lead to fundamental changes in IT industry. The first of them is the emergence of extremely large-scale data centers at low cost locations, which can serve tremendous amount of customers and achieve considerable economies of scale. The second trend this paper points out is the shift from multi-purpose all-in-one computers into a wide range of mobile devices dedicated to a specific user's needs. The last aim of this thesis is to clarify the economic impact of cloud computing in terms of costs and changes in business models. The thesis concludes by evaluating the current adoption and predicting the future trend of cloud computing.

The main objective of this diploma thesis is to design and develop a cloud hosted service that allows developers of games for Windows Phone 7 platform to extend their products with social and competitive aspect using Platform as a Service solution Windows Azure for hosting the backend of this system. The first part of the thesis analyses systems that are available on the market and that are providing similar services for the target platform. Based on this analysis, functional and general requirements for the future application are specified in the second part. Based on these requirements, use case analysis is made. The third part of the thesis is dedicated to description of the most important features, APIs and specifics of the Windows Phone 7 software platform. The fourth part is dedicated to Windows Azure as a Cloud platform both in terms of most important services, their characteristics and APIs used to utilise them and in terms of their business and pricing conditions. The fifth part addresses the architecture and the most important implementation details of the application. The final part contains the user guide for both the Windows Phone 7 application and for developers interested in using the library containing the API during the development of their game. The output of this thesis is the designed and implemented application with client-server architecture ready to have its backend deployed in Windows Azure environment and to have its frontend deployed on Windows Phone 7 devices. The client part of the system is comprised of a library intended for developers of games, which encapsulates the API needed to access the backend on the Internet, and a graphic frontend intended for end users. The server part, which contains most of the application logic, has REST interface. The applications architecture allows future development in terms of new functionality and expansion on more client platforms.

This thesis is focused on cloud technologies and their ever increasing implementation into corporate sector throughout industry branches, starting from cloud technology risks that are named and defined. This part is followed by business branches specification itself, their challenges, possibilities of solutions and risks that companies will probably encounter. Each chapter contains a summary of findings and proposal for acceptable solution.

Bakgrund: Affärsmodeller som integrerar hållbarhet i verksamheten blir allt vanligare i dagens samhälle. Ett sätt att göra detta på är genom att förena produktförsäljning med tjänstefiering, vilket resulterar i konceptet produkt som tjänst (PST). För nya företag är ofta riskkapitalbolag ett attraktivt finansieringsalternativ och utgör därmed en betydande roll som möjliggörare för affärsmodeller av denna karaktär. Frågan är hur riskkapitalbolag i sin riskbedömning utvärderar startups med PST. Syfte: Denna studie syftar till att bidra med ökad förståelse för riskkapitalbolags riskbedömning. Vidare är syftet med denna studie att undersöka hur riskkapitalbolag utvärderar startups med - produkt som tjänst (PST) - i sin riskbedömning? Genomförande: Denna studie är av en kvalitativ karaktär med en abduktiv ansats som bygger på fyra intervjuer med fyra riskkapitalbolag. Respondenterna arbetar i företag som investerar riskkapital i startups. Respondenterna har valts för att få en insyn i hur riskkapitalbolags riskbedömning genomförs. Värdedrivare och finansiella barriärer för PST har applicerats på den riskbedömning som respondenterna redogjort för. Slutsats: Studien visar på att riskkapitalbolag inte har en specifik riskbedömning för företag med högre hållbarhet, utan de bedöms efter samma kriterier som traditionella affärsmodeller. Däremot kan PST med dess värdedrivare och finansiella barriärer visa på både styrkor och svagheter i riskkapitalbolags riskbedömning / Background: Business models which integrates sustainability in their business becomes more common today. For new business venture capital is often an attractive financing alternative and therefor constitutes a significant role as an enabler for these businesses. The question is how venture capital firms in their risk assessment evaluate these startups. Purpose: This study aims to contribute to an increased understanding of venture capital firms risk assessment. Furthermore, the purpose of this study is to examine how venture capital firms evaluate startups with product as a service in their risk assessment. Completion: This study is of a qualitative structure with an abductive approach that builds on four interviews from four different venture capital firms. The interviewees all work in firms that invest venture capital in startups. They have been chosen to gain insight in the riskassessment of venture capital firms. Value drivers and financial barriers related to PaaS have been applied to the risk assessment that the interviewees have described. Conclusion: The paper shows that venture capital firms does not have a specific riskassessment for companies with a higher grade of sustainability, instead they are assessed on the same basis as traditional business models. PST can however, with its value drivers and financial barriers, display both strengths and weaknesses in the risk assessment conducted by venture capital firms.

Bakgrund: Affärsmodeller som integrerar hållbarhet i verksamheten blir allt vanligare i dagens samhälle. Ett sätt att göra detta på är genom att förena produktförsäljning med tjänstefiering, vilket resulterar i konceptet produkt som tjänst (PST). För nya företag är ofta riskkapitalbolag ett attraktivt finansieringsalternativ och utgör därmed en betydande roll som möjliggörare för affärsmodeller av denna karaktär. Frågan är hur riskkapitalbolag i sin riskbedömning utvärderar startups med PST. Syfte: Denna studie syftar till att bidra med ökad förståelse för riskkapitalbolags riskbedömning. Vidare är syftet med denna studie att undersöka hur riskkapitalbolag utvärderar startups med - produkt som tjänst (PST) - i sin riskbedömning? Genomförande: Denna studie är av en kvalitativ karaktär med en abduktiv ansats som bygger på fyra intervjuer med fyra riskkapitalbolag. Respondenterna arbetar i företag som investerar riskkapital i startups. Respondenterna har valts för att få en insyn i hur riskkapitalbolags riskbedömning genomförs. Värdedrivare och finansiella barriärer för PST har applicerats på den riskbedömning som respondenterna redogjort för. Slutsats: Studien visar på att riskkapitalbolag inte har en specifik riskbedömning för företag med högre hållbarhet, utan de bedöms efter samma kriterier som traditionella affärsmodeller. Däremot kan PST med dess värdedrivare och finansiella barriärer visa på både styrkor och svagheter i riskkapitalbolags riskbedömning. / Background: Business models which integrates sustainability in their business becomes more common today. For new business venture capital is often an attractive financing alternative and therefor constitutes a significant role as an enabler for these businesses. Thequestion is how venture capital firms in their risk assessment evaluate these startups. Purpose: This study aims to contribute to an increased understanding of venture capital firms risk assessment. Furthermore, the purpose of this study is to examine how venture capital firms evaluate startups with product as a service in their risk assessment. Completion: This study is of a qualitative structure with an abductive approach that builds on four interviews from four different venture capital firms. The interviewees all work infirms that invest venture capital in startups. They have been chosen to gain insight in the risk assessment of venture capital firms. Value drivers and financial barriers related to PaaS have been applied to the risk assessment that the interviewees have described. Conclusion: The paper shows that venture capital firms does not have a specific risk assessment for companies with a higher grade of sustainability, instead they are assessed on the same basis as traditional business models. PST can however, with its value drivers and financial barriers, display both strengths and weaknesses in the risk assessment conducted by venture capital firms.

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