This diploma thesis deals with the design and implementation of a framework for the database persistence layer development. This framework is easy to use while keeping the code elegance. It supports object oriented programming features such as inheritance and collections. Other features include versioning of objects and lazy loading. The object metadata are obtained through reflection provided by the .NET framework. The framework is not using any literal for identification (classes, attributes) even in object queries. Most of checks are done by compiler.

Microfrontend applications are composed of multiple smaller frontend applications, which are integrated at run-time. As with microservices, microfrontends can be updated in production at any time. There are no technological restrictions for releasing API-breaking updates. Therefore it is difficult to trust microfrontend applications to perform reliably in run-time and to introduce API-breaking updates without the risk of breaking consumers. This thesis presents Plutt, a tool that provides automatic guarantees for safely consuming microfrontends, by ensuring that updates in run-time are compatible. By using Plutt, consumers can be confident that a provided microfrontend will per- form the same during production as in development. Likewise, microfrontend providers can release updates without being concerned about how it will affect consumers. Moreover, a comprehensive survey about microfrontends is presented, where five industry experts are interviewed. Aspects that are not found in existing literature are discovered, which contributes to a broader knowledge base that helps future microfrontend research. / Mikrofrontend-applikationer är sammansatta av flera mindre frontend-applikationer som integreras under exekvering. Precis som med mikrotjänster, kan mikrofrontends bytas ut i produktion när som helst. Det saknas teknologiska restriktioner för att publicera API-brytande uppdateringar. Därför är det svårt att lita på att en mikrofrontend-applikation beter sig tillförlitligt under exekvering samt att introducera API-brytande uppdateringar utan att riskera att förstöra konsumenter. Det här examensarbetet presenterar Plutt, ett verktyg som erbjuder automatiska garantier för att säkert konsumera mikrofrontends genom att säkerställa att uppdateringar som introduceras i körtid är kompatibla. Genom att använda Plutt, kan konsumenter vara trygga i vetskapen att en försedd mikrofrontend presterar likadant under produktion som i utveckling. Samtidigt kan utvecklare som förser mikrofrontends släppa uppdateringar utan att bekymra sig över hur det påverkar konsumenter. Utöver Plutt, presenteras en grundlig kartläggning över mikrofrontends, där fem experter från industrin är intervjuade. Aspekter som inte hittas i existerande litteratur är upptäckta, vilket kunskapsbas och framtida forskning om mikrofrontends.

The goal of this work is to design a generally useful versioning system for the administration of different types of electronics documents, to design in detail and to implement the client part of this system (based on the client-server model). The implementation is built on .NET platform. This text also describes general approaches to versioning in different systems and shows a survey over the principles of the existing versioning systems with respect to the interaction with user.

Increased scaling costs and lack of desired features is leading to the evolution of high-performance storage systems from centralized architectures and specialized hardware to decentralized, commodity storage clusters. Existing systems try to address storage cost and management issues at the filesystem level. Besides dictating the use of a specific filesystem, however, this approach leads to increased complexity and load imbalance towards the file-server side, which in turn increase costs to scale. In this thesis, we examine these problems at the block-level. This approach has several advantages, such as transparency, cost-efficiency, better resource utilization, simplicity and easier management. First of all, we explore the mechanisms, the merits, and the overheads associated with advanced metadata-intensive functionality at the block level, by providing versioning at the block level. We find that block-level versioning has low overhead and offers transparency and simplicity advantages over filesystem-based approaches. Secondly, we study the problem of providing extensibility required by diverse and changing application needs that may use a single storage system. We provide support for (i)adding desired functions as block-level extensions, and (ii)flexibly combining them to create modular I/O hierarchies. In this direction, we design, implement and evaluate an extensible block-level storage virtualization framework, Violin, with support for metadata-intensive functions. Extending Violin we build Orchestra, an extensible framework for cluster storage virtualization and scalable storage sharing at the block-level. We show that Orchestra's enhanced block interface can substantially simplify the design of higher-level storage services, such as cluster filesystems, while being scalable. Finally, we consider the problem of consistency and availability in decentralized commodity clusters. We propose RIBD, a novel storage system that provides support for handling both data and metadata consistency issues at the block layer. RIBD uses the notion of consistency intervals (CIs) to provide fine-grain consistency semantics on sequences of block level operations by means of a lightweight transactional mechanism. RIBD relies on Orchestra's virtualization mechanisms and uses a roll-back recovery mechanism based on low-overhead block-level versioning. We evaluate RIBD on a cluster of 24 nodes, and find that it performs comparably to two popular cluster filesystems, PVFS and GFS, while offering stronger consistency guarantees.

How we approach a poem changes it. Recently, it has been suggested that one readerly approach - a bodily orientation characterised by distance, suspicion, and resistance - risks becoming reflexive, pre-conscious, and predominant. This use-oriented reading allows us to destabilise, denaturalise, dissect, defend, and define poetic texts through its manifestation in contemporary literary critique, yet it is coming to be regarded as the sole manner and mood of intelligent, intellectual engagement. In this thesis, I demonstrate the need to pluralise this attentive orientation, particularly when it comes to contemporary lyric poetry. I suggest how an overlooked mode of response might foster a more receptive mode of approach: the 'co-creative' response. Lyric poems mean to move us, and they come to mean by moving us. Recent 'simulation theories of language comprehension', from the field of cognitive neuroscience, provide empirical evidence that language processing is not a product of a-modal symbol manipulation but rather involves 'simulations' by certain classes of neurons in areas used for real-world action and perception. As habituation and abstraction increase, however, these embodied simulations 'streamline', becoming narrow schematic 'shadows' of once broad, qualitatively rich simulations. Poems, I suggest, seek to reverse this process by situationally novel variations of language, coming to mean in the broadly embodied sense in which real-world experiences 'mean'. Readers are asked to 'enact' the poem, to 'co-create' its meaning. Where critique traditionally requires that readers resist enactive participation in the aim of objective analysis, the co-creative response - a response 'in kind' by imitation, versioning, or hommage - asks readers to receive and carry forward the enactive unfolding of a poem with a composition of their own. I assert that, by thus responding with - rather than to - poems, we might foster an attentive stance of active receptivity, thereby coming to understand poems as the enactive phenomena they are.

Increased scaling costs and lack of desired features is leading to the evolution of high-performance storage systems from centralized architectures and specialized hardware to decentralized, commodity storage clusters. Existing systems try to address storage cost and management issues at the filesystem level. Besides dictating the use of a specific filesystem, however, this approach leads to increased complexity and load imbalance towards the file-server side, which in turn increase costs to scale. In this thesis, we examine these problems at the block-level. This approach has several advantages, such as transparency, cost-efficiency, better resource utilization, simplicity and easier management. First of all, we explore the mechanisms, the merits, and the overheads associated with advanced metadata-intensive functionality at the block level, by providing versioning at the block level. We find that block-level versioning has low overhead and offers transparency and simplicity advantages over filesystem-based approaches. Secondly, we study the problem of providing extensibility required by diverse and changing application needs that may use a single storage system. We provide support for (i)adding desired functions as block-level extensions, and (ii)flexibly combining them to create modular I/O hierarchies. In this direction, we design, implement and evaluate an extensible block-level storage virtualization framework, Violin, with support for metadata-intensive functions. Extending Violin we build Orchestra, an extensible framework for cluster storage virtualization and scalable storage sharing at the block-level. We show that Orchestra's enhanced block interface can substantially simplify the design of higher-level storage services, such as cluster filesystems, while being scalable. Finally, we consider the problem of consistency and availability in decentralized commodity clusters. We propose RIBD, a novel storage system that provides support for handling both data and metadata consistency issues at the block layer. RIBD uses the notion of consistency intervals (CIs) to provide fine-grain consistency semantics on sequences of block level operations by means of a lightweight transactional mechanism. RIBD relies on Orchestra's virtualization mechanisms and uses a roll-back recovery mechanism based on low-overhead block-level versioning. We evaluate RIBD on a cluster of 24 nodes, and find that it performs comparably to two popular cluster filesystems, PVFS and GFS, while offering stronger consistency guarantees.

Ziel dieser Arbeit ist es, die Entwicklung von RDF-Wissensbasen in verteilten kollaborativen Szenarien zu unterstützen. In dieser Arbeit wird eine neue Methodik für verteiltes kollaboratives Knowledge Engineering – „Quit“ – vorgestellt. Sie geht davon aus, dass es notwendig ist, während des gesamten Kooperationsprozesses Dissens auszudrücken und individuelle Arbeitsbereiche für jeden Mitarbeiter bereitzustellen. Der Ansatz ist von der Git-Methodik zum kooperativen Software Engineering inspiriert und basiert auf dieser. Die Analyse des Standes der Technik zeigt, dass kein System die Git-Methodik konsequent auf das Knowledge Engineering überträgt. Die Hauptmerkmale der Quit-Methodik sind unabhängige Arbeitsbereiche für jeden Benutzer und ein gemeinsamer verteilter Arbeitsbereich für die Zusammenarbeit. Während des gesamten Kollaborationsprozesses spielt die Data-Provenance eine wichtige Rolle. Zur Unterstützung der Methodik ist der Quit-Stack als eine Sammlung von Microservices implementiert, die es ermöglichen, die Semantic-Web-Datenstruktur und Standardschnittstellen in den verteilten Kollaborationsprozess zu integrieren. Zur Ergänzung der verteilten Datenerstellung werden geeignete Methoden zur Unterstützung des Datenverwaltungsprozesses erforscht. Diese Managementprozesse sind insbesondere die Erstellung und das Bearbeiten von Daten sowie die Publikation und Exploration von Daten. Die Anwendung der Methodik wird in verschiedenen Anwendungsfällen für die verteilte Zusammenarbeit an Organisationsdaten und an Forschungsdaten gezeigt. Weiterhin wird die Implementierung quantitativ mit ähnlichen Arbeiten verglichen. Abschließend lässt sich feststellen, dass der konsequente Ansatz der Quit-Methodik ein breites Spektrum von Szenarien zum verteilten Knowledge Engineering im Semantic Web ermöglicht.:Preface by Thomas Riechert Preface by Cesare Pautasso 1 Introduction 2 Preliminaries 3 State of the Art 4 The Quit Methodology 5 The Quit Stack 6 Data Creation and Authoring 7 Publication and Exploration 8 Application and Evaluation 9 Conclusion and Future Work Bibliography Web References List of Figures List of Tables List of Listings List of Definitions and Acronyms List of Namespace Prefixes / The aim of this thesis is to support the development of RDF knowledge bases in a distributed collaborative setup. In this thesis, a new methodology for distributed collaborative knowledge engineering – called Quit – is presented. It follows the premise that it is necessary to express dissent throughout a collaboration process and to provide individual workspaces for each collaborator. The approach is inspired by and based on the Git methodology for collaboration in software engineering. The state-of-the-art analysis shows that no system is consequently transferring the Git methodology to knowledge engineering. The key features of the Quit methodology are independent workspaces for each user and a shared distributed workspace for the collaboration. Throughout the whole collaboration process data provenance plays an important role. To support the methodology the Quit Stack is implemented as a collection of microservices, that allow to integrate the Semantic Web data structure and standard interfaces with the distributed collaborative process. To complement the distributed data authoring, appropriate methods to support the data management process are researched. These management processes are in particular the creation and authoring of data as well as the publication and exploration of data. The application of the methodology is shown in various use cases for the distributed collaboration on organizational data and on research data. Further, the implementation is quantitatively compared to the related work. Finally, it can be concluded that the consequent approach followed by the Quit methodology enables a wide range of distributed Semantic Web knowledge engineering scenarios.:Preface by Thomas Riechert Preface by Cesare Pautasso 1 Introduction 2 Preliminaries 3 State of the Art 4 The Quit Methodology 5 The Quit Stack 6 Data Creation and Authoring 7 Publication and Exploration 8 Application and Evaluation 9 Conclusion and Future Work Bibliography Web References List of Figures List of Tables List of Listings List of Definitions and Acronyms List of Namespace Prefixes

Ces travaux portent sur la conception multidisciplinaire de systèmes intégrés. Ces systèmes sont soumis à un nombre d’exigences toujours croissant, entraînant des besoins en termes d’intégration fonctionnelle et spatiale. Ces différents types d’intégration relative au produit sont également la source d’une complexité organisationnelle, provenant à la fois de la multitude d’acteurs réalisant différentes activités d’ingénierie, mais également de la diversité des domaines impliqués, désignée dans ce manuscrit par « intégration multidisciplinaire ». Pour favoriser cette intégration multidisciplinaire, les phases de « conception préliminaire » et de « conception détaillée » ont été identifiées comme déterminantes, notamment car elles se caractérisent par la collaboration de nombreux experts, manipulant un grand nombre de données techniques de définition. Les systèmes conçus lors de conceptions multidisciplinaires restent faiblement intégrés. Cela est en partie dû au cloisonnement entre les disciplines et à un mode d’organisation projet basé sur une planification prédominante, caractérisé notamment par une diffusion de l’information principalement descendante (top-down). Afin d’assurer une meilleure collaboration entre ces différentes disciplines, de permettre des prises de décision éclairées par des indicateurs opérationnels et de pouvoir analyser et mieux comprendre les phénomènes d’intégration des expertises, l’introduction d’une méthode inspirée des principes fondateurs des méthodes agiles est proposée pour la conception collaborative de systèmes intégrés.La contribution de ces travaux s’appuie sur trois concepts complémentaires. Le premier, intitulé Collaborative Actions Framework correspond à un cadre de collaboration opérationnelle autour d’actions. Un des objectifs de ce framework est de faciliter la collaboration des acteurs des projets de conception, quelle que soit leur origine disciplinaire, mais également d’assurer une traçabilité entre les prises de décision et les corrections/modifications apportées sur les données techniques. Cette traçabilité est rendue possible grâce aux liens existants avec le second concept intitulé Workspace. Apportant un nouvel éclairage sur les possibilités offertes par la collaboration autour de ces espaces de collaboration, ce concept offre un certain nombre de possibilités,notamment la mise en commun continue des travaux, l’intégration multidisciplinaire et la validation des modifications. Les échanges de données techniques entre les workspaces, ou le travail simultané sur les mêmes données techniques, s’appuient quant à eux sur la possibilité de pouvoir gérer de façon parallèle différentes versions d’une même donnée technique. Ces possibilités sont proposées par le troisième concept, intitulé branch & merge, qui permet également à différents acteurs de travailler simultanément sur les mêmes données. Enfin, ces trois concepts sont ensuite illustrés par l’intermédiaire d’un démonstrateur composé d’un scénario et d’un prototype informatique. Un produit mécatronique, combinaison synergique et systémique de la mécanique, de l'électronique et de l'informatique temps réel, est utilisé afin d’illustrer les possibilités offertes par nos travaux en termes d'intégration multidisciplinaire lors de la conception collaborative. / This work focuses on the multidisciplinary and collaborative design of integrated systems. These systems are subject to an ever increasing number of requirements, leading to the need for more comprehensive functional and spatial integration. These different types of product integration are also at the origin of organizational complexity. This complexity arises not only from the great number of actors performing various engineering activities but also from the diversity of disciplines involved (designated in this manuscript as “multidisciplinary integration”). To encourage this multidisciplinary integration, “preliminary design” and “detailed design” have been identified as the most significant steps, especially since they are characterized by the collaboration of multiple experts handling a large number of product definition’ technical data. Systems that have been designed thanks to multidisciplinary approaches are generally poorly integrated. This is partially due to the compartmentalization of disciplines, as well as to the “project-planned” method, where project planning is predominant and information is mainly spread out “top-down”. To ensure better cooperation between the various disciplines, to enable decision making based on operational indicators and to analyze and understand the multidisciplinary integration processes, a method inspired by the founding principles of agile methods (the agile manifesto) is proposed for the collaborative design of integrated systems. This work is based on three complementary concepts. The first is, the Collaborative Actions Framework, an operational framework for collaboration around actions. One objective of this framework is to improve the collaboration among designers, whatever their disciplinary origin. It also ensures traceability between decision making and corrections/changes made to technical data. This traceability is made possible by the useof the second concept, called Workspace. Even if this term is already well known, we propose a new definition/usage to transform it into collaboration spaces. This concept offers great possibilities, including the continuous delivering/sharing of experts’ contributions, multidisciplinary integration and change validation. The exchange of technical data between workspaces, or simultaneous work on the same data, relies on the ability to manage several parallel versions of the same item into a single datamanagement system. These opportunities are offered by the third concept, called Branch & Merge. Finally, these three concepts are illustrated through a scenario and a computer prototype. A mechatronic product, “the synergistic combination of mechanical and electrical engineering, computer science, and information technology” (Harashima et al., 1996), is used to illustrate the opportunities offered by our work in terms of multidisciplinary integration during collaborative design.

Tout le monde a déjà rencontré la fonctionnalité ``Undo/Redo' qui permet de se balader dans les versions précédentes d'un document. Bien que le versioning -- sauver et parcourir plusieurs versions d'entités données -- est nécessaire pour beaucoup d'applications, il est difficile de l'implémenter facilement et efficacement en temps et en espace utilisés. Dans cette thèse, nous présentons un système de versioning efficace et expressif pour les langages orientés objet. <p><p>Nous commencons par développer un modèle qui permet au développeur de sélectionner avec précision les parties intéressantes de son système qui seront sauvegardées à des moments clefs. Ce modèle permet de parcourir facilement les différentes versions enregistrées et de faire cohabiter aisément les parties versionnées avec les parties non sélectionnées par le développeur. Ce modèle est de plus compatible avec trois types de versioning (linear, backtracking et branching versioning) qui permettent des opérations diverses sur la ligne du temps, comme supprimer toutes les versions après une version donnée ou créer une nouvelle branche à partir d'une ancienne version. <p><p>Ensuite nous développons les structures efficaces en temps et en espace qui implémentent ce modèle dans un monde réel. Basées sur les travaux de Driscoll et al. elles sont adaptées aux spécificités de chaque type de versioning. <p><p>Nous montrons ensuite comment ce système peut être intégré concrètement dans un langage orienté object. Plus précisément, nous montrons comment notre système peut être intégré de façon transparente pour le développeur grâce à des outils tels que les aspects ou la transformation de bytecodes. <p><p>Pour valider nos propos, nous avons implémenté notre système dans les langages de programmation Smalltalk et Java. Nous montrons des applications réelles qui l'utilisent, telles que les post-conditions à états et le problème du planar point location. <p><p>Nous terminons cette thèse par évaluer l'efficacité de notre implémentation en effectuant des benchmarks détaillés en Smalltalk et en Java. Nous avons notamment étudié l'espace pris par nos structures données et le temps d'éxecution de chaque opération de versioning. / Doctorat en Sciences / info:eu-repo/semantics/nonPublished

The thesis contains the theoretical basis for study of possibilities of pricing information goods. The source areas are microeconomics, marketing, competitive advantage and economics of information goods. The model of market is created with constraints defined on the ground of theoretical basis. The thesis analyzes requirements that define the system that supports the choice of pricing strategy. It includes detailed design of the prototype of such system. The prototype is designed with robustness because of the future improvements. The design describes the prototype's input parameters and their transformation into useful outputs that cover basic characteristics of information goods. The designed prototype is implemented. The thesis includes demonstration of the prototype and possible directions for improvements that lead to validity of proposed model of market.