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  • 1401.
    Åsfält, Pär
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Stüeken, Jan
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Controlling Changes in Large-Scale Software Development2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Changes to a software system are the result of changing requirements or defects during the development. Each change consumes resources for the analysis, decision making, implementation, and verification. Hence, having control over changes is crucial for software development projects to meet schedules, keep quality standards and budgets. Reuse of functionality helps to create new products based on already existing building blocks. Integrating mature components enables to create reliable systems. Software product lines provide means to develop several similar systems based on reuse. Often new products also need to be released frequently to fulfil the customer needs. Shortened lead time for the development then strengthens the importance of reuse. At the same time, limited budgets and competition on the market requires projects to utilize resources efficiently. Developing several releases in parallel enables an even distribution of tasks among different roles in a development organization. Both developing software based on a product line approach and parallel releases put requirements on how changes need to be controlled. In this thesis, software engineering literature is reviewed regarding the knowledge areas of software release management, software product lines and software configuration management. Beyond the most considerable research results also related case studies are presented to show how industry practices counter existing problems. The major part of the thesis is a case study conducted at Sony Ericsson Mobile Communications AB. The outcome of the thesis is an identification of challenges of controlling changes regarding parallel development and using software product lines based on available research results and industry case studies. It further provides a case of a software development organization which faces a high market-pace, uses a software product line approach, and develops several software releases in parallel on different sites around the world.

  • 1402. Östlin, Erik
    On Radio Wave Propagation Measurements and Modelling for Cellular Mobile Radio Networks2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    To support the continuously increasing number of mobile telephone users around the world, mobile communication systems have become more advanced and sophisticated in their designs. As a result of the great success with the second generation mobile radio networks, deployment of the third and development of fourth generations, the demand for higher data rates to support available services, such as internet connection, video telephony and personal navigation systems, is ever growing. To be able to meet the requirements regarding bandwidth and number of users, enhancements of existing systems and introductions of conceptually new technologies and techniques have been researched and developed. Although new proposed technologies in theory provide increased network capacity, the backbone of a successful roll-out of a mobile telephone system is inevitably the planning of the network’s cellular structure. Hence, the fundamental aspect to a reliable cellular planning is the knowledge about the physical radio channel for wide sets of different propagation scenarios. Therefore, to study radio wave propagation in typical Australian environments, the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Telecommunications Cooperative Research Centre (ATcrc) in collaboration developed a cellular code division multiple access (CDMA) pilot scanner. The pilot scanner measurement equipment enables for radio wave propagation measurements in available commercial CDMA mobile radio networks, which in Australia are usually deployed for extensive rural areas. Over time, the collected measurement data has been used to characterise many different types of mobile radio environments and some of the results are presented in this thesis. The thesis is divided into an introduction section and four parts based on peer-reviewed international research publications. The introduction section presents the reader with some relevant background on channel and propagation modelling. Also, the CDMA scanner measurement system that was developed in parallel with the research results founding this thesis is presented. The first part presents work on the evaluation and development of the different revisions of the Recommendation ITU-R P.1546 point-to-area radio wave propagation prediction model. In particular, the modified application of the terrain clearance angle (TCA) and the calculation method of the effective antenna height are scrutinized. In the second part, the correlation between the smallscale fading characteristics, described by the Ricean K-factor, and the vegetation density in the vicinity of the mobile receiving antenna is investigated. The third part presents an artificial neural network (ANN) based technique incorporated to predict path loss in rural macrocell environments. Obtained results, such as prediction accuracy and training time, are presented for different sized ANNs and different training approaches. Finally, the fourth part proposes an extension of the path loss ANN enabling the model to also predict small-scale fading characteristics.

  • 1403. Östlin, Erik
    et al.
    Suzuki, Hajime
    Zepernick, Hans-Jürgen
    Evaluation of the propagation model Recommendation ITU-R P. 1546 for mobile services in rural Australia2008Conference paper (Refereed)
    Abstract [en]

    In this paper, the validity of Recommendation ITU-R P.1546 in a short-range terrestrial environment is analyzed. Its three versions (P.1546, P.1546-1, and P.1546-2) are compared against simple models and evaluated using measurement results that were obtained by utilizing the pilot signal of a commercial code-division multiple-access mobile telephone network. Measurement results show that P.1546-2, on average, underestimates the field strength by more than 10 dB for typical Australian rural areas. However, it improves the error standard deviation compared to previous versions. The causes of these effects and the suggestions for further development of the Recommendation are discussed and evaluated.

  • 1404. Östlund, Louise
    Information in use: In- and outsourcing aspects of digital services2007Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis is founded on the global growth of the service sector and its significance for society as a whole and for the individual human being. In the last decade, technology has changed the way services are created, developed and delivered in remarkable ways. The focus of the thesis is technology in interplay with humans and organisations and the socio-economic-technical systems in which digital services play a central role. Challenges addressed by the thesis include requirement analysis, trustworthy systems, in- and outsourcing aspects, the proper understanding of information and its use in real world applications. With this in mind, the thesis presents a configurable methodology with the purpose to quality assure service oriented workflows found in socio-economic-technical systems. Important building blocks for this are information types and service supported workflows. Our case study is of a call centre-based business called AKC (Apotekets kundcentrum). AKC constitutes a part of the Cooperation of Swedish Pharmacies (Apoteket AB). One of their main services offered to Swedish citizens is the handling of incoming questions concerning pharmaceutical issues. We analysed the interactive voice response system at AKC as a starting point for our investigations and we suggest a more flexible solution. We regard a socio-economic-technical system as an information ecology, which puts the focus on human activities supported by technology. Within these information ecologies, we have found that a Service Oriented Architecture (SOA) can provide the flexible support needed in an environment with a focal point on services. Input from information ecologies and SOA also enables a structured way of managing in- and outsourcing issues. We have also found that if we apply SOA together with our way of modelling a Service Level Agreement (SLA), we can coordinate high-level requirements and support-system requirements. A central insight in this work is the importance of regarding a socio-economic-technical system as an information ecology in combination with in- and outsourcing issues. This view will prevent a company from being drained of its core competences and core services in an outsourcing situation, which is further discussed in the thesis. By using our combination of SOA and SLA we can also divide service bundles into separate services and apply economic aspects to them. This enables us to analyse which services that are profitable while at the same time meet important requirements in information quality. As a result, we propose a set of guidelines which represent our approach towards developing quality assured systems. We also present two main types of validation for service oriented workflows: validation of requirement engineering and validation of business processes.

  • 1405.
    Özgür, Turhan
    Blekinge Institute of Technology, School of Engineering, Department of Systems and Software Engineering.
    Comparison of Microsoft DSL Tools and Eclipse Modeling Frameworks for Domain-Specific Modeling in the context of Model-Driven Development2007Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Today it is realized by industry that automation of software development leads to increased productivity, maintainability and higher quality. Model-Driven Development (MDD) aims to replace manual software development methods by automated methods using Domain-Specific Languages (DSLs) to express domain concepts effectively. Main actors in software industry, Microsoft and IBM have recognized the need to provide technologies and tools to allow building DSLs to support MDD. On the one hand, Microsoft is building DSL Tools integrated in Visual Studio 2005; on the other hand IBM is contributing to the development of Eclipse Modeling Frameworks (EMF/GEF/GMF), both tools aim to make development and deployment of DSLs easier. Software practitioners seek for guidelines regarding how to adopt these tools. In this thesis, the author presents the current state-of-the-art in MDD standards and Domain-Specific Modeling (DSM). Furthermore, the author presents current state-of-the-tools for DSM and performs a comparison of Microsoft DSL Tools and Eclipse EMF/GEF/GMF Frameworks based on a set of evaluation criteria. For the purpose of comparison the author developed two DSL designers (one by using each DSM tool). Based on the experiences gained in development of these DSL designers, the author prepared guidelines regarding how to adopt these tools to existing development environments as well as their advantages and drawbacks.

  • 1406. Šmite, Darja
    et al.
    Moe, Nils Brede
    Torkar, Richard
    Pitfalls in Remote Team Coordination: Lessons Learned From a Case Study2008In: LNCS 5089 / [ed] Salo, A. Jedlitschka and O., Springer Verlag , 2008, p. 345-359Chapter in book (Refereed)
  • 1407. Šmite, Darja
    et al.
    Wohlin, Claes
    Feldt, Robert
    Gorschek, Tony
    Reporting Empirical Research in Global Software Engineering: A Classification Scheme2008Conference paper (Refereed)
    Abstract [en]

    Increased popularity of global software engineering (GSE) has resulted in quite a number of research and industrial studies. As the area matures, an increased focus on empirically supported results leads to a greater potential impact on future research and industrial practice. However, since GSE scenarios are diverse, what works in one context might not directly apply in another. Thus it is necessary to understand, how GSE-related empirical findings should be reported to be useful for practitioners and researchers. Furthermore, it‘s important to summarize progress and get the big picture of published research to identify gaps and commonalities. In this paper we analyze differentiating factors of GSE scenarios and offer a classification scheme for describing the context of a GSE study. In addition, we report initial results of a systematic review on GSE-related empirical literature using papers from ICGSE 2006 and 2007, at the same time illustrating and evaluating the proposed scheme.

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