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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

A chronicle approach to modelling temporal database objects

Schleifer, Paul January 1997 (has links)
No description available.

An object-oriented approach towards a collaborative environment for computer-aided engineering (C.A.E.)

Iosifidis, Philip January 1996 (has links)
No description available.

Automating reuse support in a small company

Biggs, Peter J. January 1998 (has links)
Software engineering has been facing a crisis for several years now - there is more demand for new software than there is ability to supply. Software reuse is a potential way to tackle the problems caused by the software crisis with its promises of increased productivity and cheaper development costs. Several software reuse successes have been reported, but these have been predominantly in large, well structured companies. However, there are numerous smaller companies that could also benefit from reuse if it were made available to them. This thesis addresses these issues by implementing a reuse programme in a small company. An incremental approach to reuse introduction is adopted, following the Seven Steps to Success, and 'lightweight' processes are recommended to support the reuse programme. A prototype tool set, ReThree- C++, was developed to automate support for the reuse programme. The results of the case study are presented. The reuse programme was successful, with benefits to the company including both increased speed of production and financial gains from selling reusable components. The challenges faced are also identified. Details of the tool set giving automated support for reuse are also presented. The tool set is an approach to reuse repository control which also integrates information abstraction from C++ source code to generate class hierarchy charts and software documentation automatically. It helps developers store, retrieve, understand and use reusable components. The usefulness of the tool set is shown with an experiment and as part of the case study. The purpose of the thesis is to show that small companies can implement reuse, and that the method presented supports the introduction of a reuse programme. It concludes that although challenges were faced, great benefits can be gained by using the method with automated support for reuse in a small company.

Reconfigurable mobile communication networks

Moessner, K. January 2001 (has links)
Telecommunication technologies and networks are constantly changing; with the introduction of the GSM system the shift from wired to wireless telephony experienced a unique boom. Since then, behaviour and communication needs of users (i.e. subscribers) have undergone rapid changes from initially the need for pure wireless voice transmission to now data and multimedia content traffic. Introduction of the 3rd Generation (UMTS/IMT 2000) promised the delivery of these services and the integration with the Internet. However, legacy technologies and networks are not likely to be replaced soon, the different wireless and wired communication and information infrastructures will co-exist and will have to work, seemingly seamless, together. The here documented research work delivers basic mechanisms supporting this integration, therefore a variety of technologies from different areas, ranging from Software Radio technology to Object-Oriented computing, have been brought together to introduce reconfigurability to mobile communication networks. Distributed object computing technologies are evaluated and their application as signalling and support platforms for reconfigureable systems is shown in different examples. Other novelties are the introduction of a protocol for download of reconfiguration software, from various software sources, these sources include Smart Cards, wired outlets and Over-The-Air. Furthermore, an object-oriented framework for flexible, 'on-the-fly' protocol exchange has been developed; the mechanisms and architecture of this framework are described within this thesis. Combining protocol reconfiguration, software download and distributed platforms and focusing on control and management of reconfiguration have led to the design and definition of a reconfiguration management architecture. Functionality and structure of this architecture are documented, and its single modules are described. Providing means and mechanisms enabling management and control of reconfiguration within reconfigureable mobile communication networks is the purpose of this thesis. KM, Guildford, July 2001 Key words: reconfiguration, reconfiguration management. Software Radio, object-orientation, middleware, CORBA, Universal Control CHannel.

Risk in the development design

Crossland, Ross January 1997 (has links)
No description available.

A framework for organizational information support in cooperative environments

Prinz, Wolfgang January 1996 (has links)
No description available.

He[d]uristics - Heuristics for designing object oriented examples for novices

Nordström, Marie January 2009 (has links)
<p><p>The use of examples is known to be important in learning, they should be “exemplary” and function as role-models.</p><p>Teaching and learning problem solving and programming in the object oriented paradigm is recognised as difficult. Object orientation is designed to handle complexity and large systems, and not with education in focus. The fact that object orientation often is used as first paradigm makes the design of examples even more difficult and important.</p><p>In this thesis, a survey of the literature is made to establish a set of characteristics for object orientation in general. This set of characteristics is then applied to the educational setting of introducing novices to object oriented problem solving and programming, resulting in a number of heuristics for educational purposes, called He[d]uristics. The proposed He[d]uristics are targeted towards educators designing small-scale examples for novices, and is an attempt to provide help in designing suitable examples, not a catalogue of good ones.</p><p>The He[d]uristics are discussed and exemplified and also evaluated versus the derived set of characteristics and known common problems experienced by novices.</p></p>

A third generation object-oriented process model:roles and architectures in focus

Kivistö, K. (Kari) 21 November 2000 (has links)
Abstract This thesis examines and evaluates the Object-Oriented Client/Server (OOCS) model, a process model that can be used when IT organizations develop object-oriented client/server applications. In particular, it defines the roles in the development team and combines them into the process model. Furthermore, the model focuses on the client/server architecture, considering it explicitly. The model has been under construction for several years and it has been tested in a number of industrial projects. Feedback from practice has thus been an important source when the model has been evolving into its current form. Another source for evolution has been other process models and technical progress in this field. This thesis reveals the theoretical and practical aspects that have influenced the model's characteristics and developmnt. The object-oriented paradigm has been the driving force when creating the OOCS model. The first object-oriented development models were, however, both inadequate and contradictory to each other. The OOCS model utilizes the best practices from these early models. The model also defines artifacts to be delivered in each phase. The artifacts are synchronized with the Unified Modeling Language (UML), a new standard modeling notation. From the very beginning the OOCS model has included a strong client/server viewpoint, which is not stated so clearly in other object-oriented models. A three-tier division of the application (presentation, business logic, data management) can be found in each phase. This division has become crucial in recent years, when applications have been built on distributed architecture. The team-based roles included in the model are based on the work of a few other researchers, although this topic has not gained the importance it should have had. Namely, it is people that develop the application and their involvement in the process should be stated explicitly. The roles of the developers are closely connected to the OOCS process model via the concept of activities included in the model. The roles concentrate mainly on project members, but company-level aspects have also been considered. This thesis summarizes the work carried out in the last five years. It shows how the model has evolved in practice and how other models have contributed to it. The team-based OOCS model is in use in some IT organizations. The cases presented in this thesis illustrate how to adapt the model into specific organizational needs.

Curbing Dependencies in Software Evolution of Object-Oriented Systems

Skoglund, Mats January 2006 (has links)
Relationships between classes and objects in object-oriented software are necessary in order for the parts of the systems to provide dynamic behavior. These inherent relationships also create dependencies which can give rise to problems for software evolution of object-oriented software systems. Dependencies in software make systems difficult to understand, reuse, change and verify. This thesis presents analytical and empirical investigations of dependency-related problems in software evolution of object-oriented software and on how such problems can be handled with dependency focused techniques, methods and processes. The research presented in this thesis includes: Development of a programming language construct for controlling dependencies; formal experiments on code inspection techniques; exploring change strategies' effects on test suites; an industrial case study of regression test selection techniques for object-oriented software; proving the efficiency and defect detection capabilities of a novel regression test selection technique. The thesis contributes to increased knowledge on the role of dependencies in software evolution of object-oriented software. Specific contributions are a programming language construct that can control access to dependencies in software. Other main contributions are insights on the efficiency of dependency focused code inspection techniques and contribution to the knowledge on dependency-based regression test selection techniques for large scale software. Another contribution is a novel change-based regression test selection technique.

Object oriented quality in introductory programming education

Nordström, Marie January 2010 (has links)
Examples are important when we attempt to learn something new. To learn prob-lem solving and programming is an acknowledged difficulty. Teaching and learning introductory object oriented problem solving and programming has been discussed extensively since the late 1990’ies, when a major shift to object orientation as first programming paradigm took place. Initially, this switch was not considered to cause any major problems, because of the accumulated knowledge for how pro-gramming should be taught. This turned out to be naive. Knowledge gained for the imperative paradigm did not apply well to the object oriented paradigm. Because of its importance for the field of computer science, introductory pro- gramming education has drawn a lot of attention. Most of the research done in connection to object oriented problem solving and programming has been focused on students learning and the difficulty to acquire skills in programming. Less investigated is the foundation of the educational mission, the characteris- tics of object orientation and how this is best supported by the educator. There is no obvious agreement of what the basics of object orientation are, especially not from an educational point of view. In this thesis, two major aspects concerning the teaching of object orientation have been investigated: the definition of object oriented quality, specifically in examples for novices, and educators’ views on aspects of object orientation. Based on research of how object orientation is characterised in literature and in software design principles, a set of concepts and principles are presented as a description of basic characteristics of object orientation. These are applied to the educational context, and a number of heuristics, called Eduristics, for the design of object oriented examples for novices are defined. The Eduristics are then used to discuss the flaws and shortcomings of common textbook examples, but also how the object oriented quality of examples can be improved. To be able to evaluate the quality of examples, we initiated and participated in the development of an evaluation tool. This tool has been used to evaluate a number of examples from popular textbooks. The results show that the object oriented quality of examples is low. To explore the ways educators view a number of aspects of object orientation and the teaching of it, ten interviews have been conducted. The results of this study show that the level of abstraction in the conceptual model of object orientation among educators is low, and that novices are not given any support for object oriented problem solving. / Exempel är viktiga när man ska lära sig något nytt och det gäller även när man ska lära sig programmera. Att lära sig problemslösning och programmering är erkänt svårt och det har föranlett många förslag på vad som är ett bra sätt. Under 1990-talet skedde en större omläggning i programmeringsundervisningen världen över. Från att ha introducerat programmering i det imperativa/procedurella paradigmet övergick man till att använda objektorientering som första paradigm. Inledningsvis trodde man inte att det skulle skilja sig på något avgörande sätt från tidigare erfarenheter om hur programmering skulle undervisas. Detta visade sig vara en naiv föreställning. Mycket av den kunskap som ackumulerats kring den imperativa programmeringsundervisningen visade sig svår att överföra till objekt orientering. Omställningen har varit mödosam och är fortfarande inte genomförd fullt ut. Programmering är centralt i datavetenskap, eftersom olika aspekter av programvarukonstruktion genomsyrar det mesta av verksamheten kring datorer. Utbildningsmässigt är en inledande kurs i problemlösning och programmering förutsättningen för vidare studier i ämnet. Detta gör att en hel del uppmärksamhet har riktats mot problemlösning och programmering. Det mesta av den forskning som finns gjord i anslutning till objekt orienterad problemlösning och programmering har varit fokuserad på nybörjares lärande och problem att komma in i programmerandet. Mycket lite finns gjort när det gäller själva utgångspunkten för undervisningen om objektorientering, nämligen vad som är centralt i objektorientering och på vilket sätt det ska manifestera sig i undervisningen. I det här arbetet har två huvudaspekter av objektorientering i undervisningssammanhang undersökts: definitionen av objektorienterad kvalité, specifikt i exempel för nybörjare, samt vilken syn lärare har på olika aspekter av objektorientering. För att möjliggöra detta har vi undersökt hur objektorientering beskrivs i litteraturen och i vedertagna design-principer som används i programvaruutvecklingssammanhang. Baserat på resultatet av den undersökningen har vi använt en uppsättning koncept och designprinciper för att definiera vad som är karakteristiskt för objektorientering. Med detta som utgångspunkt har vi applicerat definitionen av objektorientering till undervisningssammanget och definierat ett antal heuristiker specifikt för konstruktion av objektorienterade exempel för nybörjare. Parallellt med detta arbete deltog vi i utvecklingen av ett utvärderingsverktyg för att värdera objektorienterade exempel för nybörjare. Detta verktyg har använts för en större utvärdering av exempel hämtade från populära läroböcker. Resultaten från denna studie visar att exempel generellt sett håller låg objektori enterad kvalitet. Vi har också visat att exempel som värderas högt, uppfyller våra heuristiker och att exempel som värderas lågt strider mot desamma. För att utforska hur lärare ser på objektorientering och hur de resonerar kring strategier för att lära ut objektorientering, har vi gjort tio intervjuer med lärare i gymnasieskolan och på universitetsnivå. Resultaten visar att den konceptuella modellen för objektorientering är mycket enkel i förhållande till den komplexitet som ofta anses känneteckna paradigmet. Dessutom, ges i stort sett inget stöd för nybörjaren vad gäller att förstå och lära sig problemlösningsansatsen, som ofta upplevs som väsensskild från hur man i normala fall löser problem.

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