1 - 20 of 20
rss atomLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
  • Disputas: 2019-02-01 09:00 J1650, Karlskrona
    Sievert, Thomas
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    GNSS Radio Occultation Inversion Methods and Reflection Observations in the Lower Troposphere2019Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    GNSS Radio Occultation (GNSS-RO) is an opportunistic Earth sensing technique where GNSS signals passing through the atmosphere are received in low Earth orbit and processed to extract meteorological parameters. As signals are received along an orbit, the measured Doppler shift is transformed to a bending angle profile (commonly referred to as bending angle retrieval), which, in turn, is inverted to a refractivity profile. Thanks to its high vertical resolution and SI traceability, GNSS-RO is an important complement to other Earth sensing endeavors. In the lower troposphere, GNSS-RO measurements often get degraded and biased due to sharp refractive gradients and other complex structures. The main objective of this thesis is to explore contemporary retrieval methods such as phase matching and full spectrum inversion to improve their performance in these conditions. To avoid the bias caused by the standard inversion, we attempt to derive additional information from the amplitude output of the examined retrieval operators. While simulations indicate that such information could be found, it is not immediately straightforward how to achieve this with real measurements. The approach chosen is to examine reflected signal components and their effect on the amplitude output.

  • Klotins, Eriks
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Unterkalmsteiner, Michael
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Gorschek, Tony
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Software Engineering Anti-Patterns in Start-Ups2019Inngår i: IEEE Software, ISSN 0740-7459, E-ISSN 1937-4194Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Software start-up failures are often explained with a poor business model, market issues, insufficient funding, or simply a bad product idea. However, inadequacies in software engineering are relatively unexplored and could be a significant contributing factor to the high start-up failure rate. In this paper we present the analysis of 88 start-up experience reports, revealing three anti-patterns associated with start-up progression phases. The anti-patterns address challenges of releasing the first version of the product, attracting customers, and expanding the product into new markets. The anti-patterns show that challenges and failure scenarios that appear to be business or market related are, at least partially, rooted in engineering inadequacies.

  • Wen, Wei
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för teknik och estetik.
    Biological Inspired Deformable Image Sensor2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Nowadays, cameras are everywhere thanks to the tremendous progress on sensor technology. However, their performance is far away from what we experience by our eyes. The study from evolution process shows how the sensor arrangement of retina in human vision has differentiated from other species and is formed into a specific combination of sub-arrangements from hexagonal to elliptical ones. There are three major key differences between our visual cell arrangement and current camera sensors which are: the sub-arrangements, the pixel form and the pixel density.

    Despite the advances in sensor technology we face limitations in their further development; i.e. to make the cameras close to the visual system. This is due to the optical diffraction limit which prevents us to increase the sensor resolution, and rigidity of hardware implementation which prevent us to change the image sensor after manufacturing. In the thesis the possibilities to overcome such limitations are investigated where the intention is to find a closer sensory solution to the visual system in comparison to the current ones.

    Breaking the diffraction barrier and solving the rigidity problem are simultaneously achieved by introducing and estimating virtual subpixels. A statistical framework consisting of local learning model and Bayesian inference for predicting the incident photons captured on each such a subpixel is used to resample the captured image by any current camera sensor. By investigating the virtual variation of pixel size and fill factor the validity of the proposed idea is proven by which the results show significant changes of dynamic range and tonal levels in relation to the variation. As an example, for both monochrome and color images the results show that by virtual increase of fill factor to 100%, the dynamic range of the images are widened and the tonal levels are enriched significantly over 256 levels for each channel.

    The results of virtual variation of the fill factor and pixel size indicates that it is feasible to change the rigidity of the image sensor using the software-based method. Inspired by the mosaic in the fovea, the center of human retina, the hexagonal sub-arrangement and pixel form are proposed to generate images based on the estimated virtual subpixels. Compared to the original square images, not only the dynamic range and tonal levels are improved, but also the hexagonal images are superior in detection of edges, i.e. more edge points on the contour of the objects are detected in hexagonal images.

    The evaluation of different sub-arrangements or pixel forms of the image sensor is a challenging task and should be directed to a more specific task. Since the curvature contours contain most of the information related to object perception and human vision is highly evolved to detect curvature object, the task is focused to investigate the impact of the curviness on the different pixel forms and sub-arrangements, by comparing two categories of images; having curved versus linear edges of the objects in a pair of images which have exact similar contents but different contours. The detectability of each of the different sensor structures for curviness is estimated and the results show that the image on hexagonal grid with hexagonal pixel form is the best image type for distinguishing the curvature contours in the images.

    According to the pattern of pixels tiling, there are two types of pixel sub-arrangements, i.e. periodic (e.g. square or hexagonal), and aperiodic (e.g. Penrose). Each type of sub-arrangements is investigated where the pixel forms and density are variable. By having at least two generated images of one configuration (i.e. specific sub-arrangement, pixel form and density), the result of histogram of gradient orientation of the certain sensor arrangement shows a stable and specific distribution which we called it the ANgular CHaracteristic of a sensOR structure (ANCHOR). Each ANCHOR has a robust pattern which is changed by the change of the sensor sub-arrangement. This makes it feasible to plan a sensor sub-arrangement in the relation to a specific application and its requirements, and more alike the biological vision sensory. To generate such a flexible sensor, a general framework is proposed for virtual deforming the sensor with a certain configuration of the sensor sub-arrangement, pixel form and pixel density.

    Assessing the quality difference between the images generated by different sensor configuration or addressing from on configuration to another one generally needs the conversion of one to another. To overcome this problem, a common space is proposed by implementing a continuous extension of square or hexagonal images based on the orbit function, for quality evaluating the images with different arrangements and addressing from one type of image to another one. The evaluation results show that the creation of such space is feasible which facilitates a usage friendly tool to address an arrangement and assess the changes between different spatial arrangements, for example, it shows richer intensity variation, nonlinear behavior, and larger dynamic range in the hexagonal images compared to the rectangular images.

  • Disputas: 2019-01-25 14:00 J1640, Karlskrona
    Nikulina, Varvara
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling. Blekinge Institute of Technology.
    Need for speed: towards urban planning for rapid transitioning to sustainable personal mobility2019Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The Paris Agreement, the recent Special Report from the Intergovernmental Panel on Climate Change, and the Sustainable Development Goals are examples of United Nation’s facilitated calls for urgent climate action and more generally for a rapid transition of society towards sustainability. Since urban personal mobility is a significant contributor to society’s current sustainability challenges, and considering current trends of population growth and urbanisation, there is a strong need to develop enhanced support for urban planning for rapid transitioning to sustainable personal mobility.

    This thesis is part of a wider effort to develop methodological support for such planning and action. The aim of the thesis is to provide a partial foundation for that wider effort by: (i) identifying and organising prominent research themes related to the above topic; and since previous research points to benefits of a transdisciplinary, multisectoral and multicultural approach, (ii) exploring and addressing the complexity of co-production processes in such contexts; and (iii) analysing the appropriateness of some prominent planning approaches for the desired planning support.

    The aim is pursued through a systematic literature review, including bibliometric analyses, and two empirical case studies, including workshops, interviews, field studies and feasibility studies. One of the case studies included participants from several countries in the Southern Baltic region and the other case study tested the usefulness of different planning approaches in the local context of Kisumu, Kenya and Gothenburg, Sweden, respectively.

    The thesis provides a map of some prominent research themes and discusses their relevance to the field of urban planning for rapid transitioning to sustainable personal mobility. The analysis of the identified themes and their development over the past ten years shows that there has been a shift in mobility planning from ’predict and provide’ towards participatory visionary approaches. This, in turn, has led to new challenges, related to, for example, epistemic communities, language and culture. Furthermore, it is seen that sustainability considerations have become increasingly pronounced in the urban mobility planning literature. However, different dimensions of sustainability are often considered individually (e.g. the ecological and social dimensions) and coordinated approaches to sustainable mobility planning are virtually lacking.

    At the methodological level, the thesis provides a preliminary conceptual framework for analysing complexity in co-production processes with regard to epistemic communities, language and culture, as well as a discussion of the usefulness of four specific planning approaches for the desired planning support, namely the backcasting, transdisciplinary co-production of knowledge, foresighting and SymbioCity approaches.

    The overall conclusion is that there is a need for research that would show how mobility actors can contribute to resolve pressing issues related to climate change fast enough without compromising other aspects of sustainability, including how temporary trade-offs can be addressed in a strategic way.

  • Nikulina, Varvara
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling. Blekinge Institute of Technology.
    Lindal, Johan
    Mistra Urban Futures, SWE.
    Baumann, Henrikke
    Chalmers, SWE.
    Simon, David
    Mistra Urban Futures, SWE.
    Ny, Henrik
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling.
    Lost in translation: a framework for analysing complexity of co-production settings in relation to epistemic communities, language and culture.Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Planning in modern urban environments requires skills to address complexity in order to move towards sustainability. Co-production of knowledge in transdisciplinary groups was found to be a useful tool in such contexts. Using the concepts of multilingualism, epistemic communities and culture, the article proposed a conceptual framework for analysing complexity of co-production settings, as an indispensable means of managing complex challenges. The framework was evaluated based on inclusiveness, cross-sectoral understanding, applicability in different contexts and time perspectives. Moreover, it was compared to other studies. Based on the framework, several suggestions to maintain were put forth for a process leader (facilitator) when preparing for a co-production process: linguistic equality between participants, disciplinary integrity, a working culture of mutual respect, simultaneous mitigation and informed facilitation. Finally, the article suggested possible future research questions, related to development of the framework: identification of levels of complexity and mapping specific tools to address complexity at each level; integration of other factors of diversity, such as gender, age, as well as political and institutional contexts.

  • Nikulina, Varvara
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling. Blekinge Institute of Technology.
    Simon, David
    Mistra Urban Futures, SWE.
    Ny, Henrik
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling.
    Baumann, Henrikke
    Chalmers, SWE.
    Context-adapted urban planning for rapid transitioning of personal mobility towards sustainability: systematic literature reviewManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Sustainability related challenges in mobility planning have been recognised at the international level and the urgency for change has been widely discussed among scholars. However, there seems to be no general agreement on the best ways of pursuing such change. To seek answers to the question of how to pursue change, this study analysed the development of the broad research fields of mobility, urban planning and transitions, and the overlap of these bodies of literature. Both academic and non-academic literatures were covered. By means of a systematic literature review, as well as bibliometric studies, several prominent research themes that address change from planning and transition perspectives were identified. Moreover, these themes describe different viewpoints and challenges in mobility planning. These include planning and policy for sustainable mobility and accessibility, backcasting and scenario planning, indicators in planning, modes of transport, decision-making, studies of global North and global South, as well as overarching themes of equity, equality and justice, roles of institutions, and co-production of knowledge. Strategies for staying up to date with these fields were also identified. In the literature covered, the temporal dimension in mobility planning was described in four different ways, but little was found about how accelerated transitions towards sustainable mobility can be achieved. Further knowledge gaps were identified in relation to behavioural change, policy development, institutionalisation of planning capacity and social sustainability in mobility planning. This created an outline for possible future studies.

  • Nordahl, Christian
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Grahn, Håkan
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Persson, Marie
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Boeva, Veselka
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Organizing, Visualizing and Understanding Households Electricity Consumption Data through Clustering Analysis.2018Inngår i: Organizing, Visualizing and Understanding Households Electricity Consumption Data through Clustering Analysis, https://sites.google.com/view/arial2018/accepted-papersprogram , 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose a cluster analysis approach for organizing, visualizing and understanding households’ electricity consumption data. We initially partition the consumption data into a number of clusters with similar daily electricity consumption profiles. The centroids of each cluster can be seen as representative signatures of a household’s electricity consumption behaviors. We evaluate the proposed approach by conducting a number of experiments on electricity consumption data of ten selected households. Our results show that the approach is suitable for data analysis, understanding and creating electricity consumption behavior models.

  • Linde, Peter
    Blekinge Tekniska Högskola, Biblioteket.
    BTH Newsletter on Science Publishing and Open Access Issues: December 20182018Annet (Annet (populærvitenskap, debatt, mm))
  • Erman, Maria
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Applications of Soft Computing Techniques for Wireless Communications2019Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis presents methods and applications of Fuzzy Logic and Rough Sets in the domain of Telecommunications at both the network and physical layers. Specifically, the use of a new class of functions, the truncated π functions, for classifying IP traffic by matching datagram size histograms is explored. Furthermore, work on adapting the payoff matrix in multiplayer games by using fuzzy entries as opposed to crisp values that are hard to quantify, is presented.

    Additionally, applications of fuzzy logic in wireless communications are presented, comprised by a comprehensive review of current trends and applications, followed by work directed towards using it in spectrum sensing and power control in cognitive radio networks.

    This licentiate thesis represents parts of my work in the fields of Fuzzy Systems and Wireless Communications. The work was done in collaboration between the Departments of Applied Signal Processing and Mathematics at Blekinge Institute of Technology.

  • Nikulina, Varvara
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling. Blekinge Institute of Technology.
    Baumann, Henrikke
    Chalmers University of Technology, SWE.
    Simon, David
    Mistra Urban Futures, SWE.
    Sprei, Frances
    Chalmers University of Technology, SWE.
    Sustainable Transport Futures: Analysis of the Selected Methodologies Supporting the Planning Process Towards Achieving Goal 11 Sustainable Cities and Communities2018Inngår i: Handbook of Sustainability Science and Research / [ed] W. Leal Filho, Springer, 2018, s. 473-488Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    A quarter of energy-related greenhouse gas emissions (GHG) originate from the transportation sector. Continuously increasing demand for transportation services worldwide is one of the main urban challenges addressed by Sustainable Development Goal 11, target 2. One way to address this issue is to develop an integrated transportation system that can ensure confidence and comfort for the passengers. This will contribute not only to the customers’ experience but also to operators and authorities through sustainable, cost-effective, and profitable services. Conversely, the lack of such a system or a poorly managed system prevents the economy and society from realizing its potential. In the transition towards sustainability, the planning process of complex systems such as transportation often requires supportive tools and methods, such as futures methodologies that assist decision-making by providing information about possible futures. In today’s rapidly changing environment, forecasting tools do not always provide the expected outcomes since it is difficult to predict all the unexpected events. Therefore, there is a demand for alternative methods that not only grasp the constant changes but also create additional value (for example, meeting the needs of multisectoral collaboration and creation of common vision). The present article investigates the usefulness of three such methodologies, namely backcasting, foresighting, and SymbioCity, for the planning process of the bus park and railway station in Kisumu, Kenya, and Centralen in Gothenburg, Sweden. The paper’s contribution is a description of the Kenyan transportation system (which has not been studied in detail before), planning process, and pertinent issues related to the stations both in Kisumu and Gothenburg, located in the sharply contrasting contexts of global South and global North, respectively. On the basis of field research, interviews, and feasibility study of futures methodologies, the paper concludes that backcasting is the most suitable of the methodologies for both places, since it can be applied at a small scale, and provides creative solutions and has a high level of integration of stakeholders. Furthermore, the paper examines the application of the futures methodologies in multisectoral urban transitions apart from transportation and draws conclusion on what can be learnt from it.

  • Mukhtar-Landgren, Dalia
    et al.
    Lunds universitet, SWE.
    Berglund Snodgrass, Lina
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för fysisk planering.
    Kräver hållbar mobilitet nya roller för den kommunala planeringen?2018Inngår i: PLAN, ISSN 0032-0560, nr 2-3, s. 93-94Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • Minhas, Nasir Mehmood
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Regression Testing Challenges and Solutions: An Industry-Academia Perspective2019Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Background: Software quality assurance (QA) is an essential activity in the software development lifecycle. Among the different QA activities, regression testing is a challenging task for large-scale software development. Regression testing is a well-researched area, and a large number of techniques have been proposed to fulfill the needs of industry. Despite the extensive research, the adoption of proposed regression testing techniques in the industry is limited. Studies show that there is a visible gap between research and practice.

    Objective: This work aims at reducing the gap between industry and academia in regression testing. To fulfill this aim we have the following objectives:

    1) Understanding the practitioners' goals regarding regression testing.

    2) Understanding the current state of regression testing practice and challenges in the industry.

    3) Investigating the testing research applicable in an industrial context.

    Method: We conducted multiple studies using different methods.

    To explore the industry perspective on regression testing we used focus group and interview-based studies. To explore solutions from the literature, we used the systematic literature review and systematic mapping study.

    Results: This thesis presents the practitioners' specific regression testing goals. The identified goals are confidence, controlled fault slippage, effectiveness, efficiency, and customer satisfaction. The challenges identified in the thesis are of two categories, 1) management related challenges and 2) technical challenges. Technical challenges relate to test suite maintenance, test case selection, test case prioritization, evaluation of regression testing.

    We have mapped 26 empirically evaluated regression testing techniques to the context, effect, and information taxonomies, and provided a guide to the practitioners regarding the adoption of the techniques in an industrial setting. We have also classified 56 model-based test case generation techniques regarding their strengths/limitations, input/intermediate models used, and relevance to the industrial context.

    Conclusions: The challenges identified in this study are not new for research and practice. There could be two reasons regarding the presence of recurring challenges: 1) regression testing techniques proposed in the literature do not fit the companies’ context, 2) or, companies are not aware of the availability of the techniques that could be suitable for their context. To support the adoption of existing research on regression testing in the industry, we have presented three taxonomies. These taxonomies, allow the characterization of regression testing techniques and enable to determine which of these techniques might be suitable in a given context. Furthermore, the identification of information needs for these techniques would be helpful to learn the implications regarding the cost of adoption. Regarding the support in test case generation, we conclude that current research on interaction model-based test case generation techniques did not illustrate the use of rigorous methodology, and currently, model-based test case generation techniques have low relevance for the industrial problems.

  • Disputas: 2019-01-25 10:00 Rio Grande, Karlshamn
    Paxling, Linda
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för teknik och estetik.
    Transforming technocultures: Feminist Technoscience, Critical Design Practices and Caring Imaginaries2019Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    The digital era has brought forward many innovative technologies but their contribution to resilient, inclusive and sustainable societies remain ambiguous. Innovation has often been considered a key component for production and economic growth, but this notion is gradually changing. Innovation is turning into a practice for societal responsibility and sustainable development, transforming the directionality of the grand challenges of our time. I address this transformation of directionality by focusing on the norms and values which are embedded in technology design. The main objective of this thesis is to develop knowledge on how norms of innovation, technology and development are embedded in technoscientific storytelling and how these narratives affect and are affected by technocultural practices.  I have approached this objective by engaging with technocultures in Uganda and Sweden where I have explored how assemblages of people, technologies and infrastructures merge, overlap and contrast with each other in technological development. The empirical work has been quite different in scope and context and have tackled norms and values differently. In Uganda I met with representatives from the urban ICT community to discuss the challenges and possibilities with the mobile phone infrastructure. I held an Open Space Workshop on mobile development, and met with the co-founders of two women’s tech initiatives. In Sweden I did a pilot study on a norm-critical game culture and worked with critical design practices in a higher learning context.

    The different projects present a complex scenario of how technoscientific stories are power-laden, contradictory and messy. I have located several dominant narratives that affect, and are also affected by, the actors in the different technocultures. The dominant narrative of a linear development of economic growth and technological advancement creates technocultures of marginality and inequality that have ethical implications for individuals and infrastructures in Uganda. Working with feminist and postcolonial technoscience I challenge the binary innovation systems of science and modernity and argue for a more heterogeneous approach to development and epistemology. Another dominant narrative concerns the norms and values of how games and media techno- logy can and should be performed. Working with critical design practices I encourage a learning platform that creatively critiques design processes of ‘the no longer and the not yet’.

    The historical present has created unjust relationships that are systematically power- laden and violent. We cannot ignore these relationships. When we choose to re- imagine science, technology and innovation as transformative with the possibility of subverting these violent relationships, we may be able to foster more response-able and caring relationships. When we acknowledge knowledge production as situated, partial and located we learn to listen for more stories than one.

  • Minhas, Nasir Mehmood
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Masood, Sohaib
    UIIT PMAS Arid Agriculture University, PAK.
    Petersen, Kai
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Nadeem, Aamer
    Capital University of Science and Technology, PAK.
    A Systematic Mapping of Test Case Generation Techniques Using UML Interaction Diagram2018Inngår i: Journal of Software: Evolution and Process, ISSN 2047-7473, E-ISSN 2047-7481Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Testing plays a vital role for assuring software quality. Among the activities performed during testing process, test cases generation is a challenging and labor intensive task. Test case generation techniques based on UML models are getting the attention of researchers and practitioners. This study provides a systematic mapping of test case generation techniques based on interaction diagrams. The study compares the test case generation techniques, regarding their capabilities and limitations, and it also assesses the reporting quality of the primary studies. It has been revealed that UML interaction diagrams based techniques are mainly used for integration testing. The majority of the techniques are using sequence diagrams as input models, while some are using collaboration. A notable number of techniques are using interaction diagram along with some other UML diagram for test case generation. These techniques are mainly focusing on interaction, scenario, operational, concurrency, synchronization and deadlock related faults.

    From the results of this study, we can conclude that the studies presenting test case generation techniques using UML interaction diagrams failed to illustrate the use of rigorous methodology, and these techniques did not demonstrate the empirical evaluation in an industrial context. Our study revealed the need for tool support to facilitate the transfer of solutions to industry.

  • Minhas, Nasir Mehmood
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Petersen, Kai
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Börstler, Jürgen
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Wnuk, Krzysztof
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Regression testing for large-scale embedded software development: Exploring the state of practice2018Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Context: A majority of the regression testing techniques proposed by the research have not been adopted in industry. To increase adoption rates, we need to better understand the practitioners' perspectives on regression testing.

    Objective: This study aims at exploring the regression testing state of practice in the large-scale embedded software development. The study has two objectives, 1) to highlight the potential challenges in practice, and 2) to identify the industry-relevant research areas regarding regression testing.

    Method: We conducted a qualitative study in two large-scale embedded software development companies, where we carried out semi-structured interviews with representatives from five software testing teams. We did conduct the detailed review of the process documentation of the companies to complement/validate the findings of the interviews.

    Results: Mostly, the practitioners run regression testing with a selected scope, the selection of scope depends upon the size, complexity, and location of the change. Test cases are prioritized on the basis of risk and critical functionality. The practitioners rely on their knowledge and experience for the decision making regarding selection and prioritization of test cases.The companies are using both automated and manual regression testing, and mainly they rely on in-house developed tools for test automation. The challenges identified in the companies are: time to test, information management, test suite maintenance, lack of communication, test selection/prioritization, lack of assessment, etc. The proposed improvements are in line with the identified challenges. Regression testing goals identified in this study are customer satisfaction, critical defect detection, confidence, effectiveness, efficiency, and controlled slip through of faults.

    Conclusions: Considering the current state of practice and identified challenges we conclude that there is a need to reconsider the regression test strategy in the companies. Researchers need to analyze the industry perspective while proposing new regression testing techniques. The industry-academia collaboration projects would be a good platform in this regard.

  • Ali, Nauman bin
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Engström, Emelie
    Lund University, SWE.
    Taromirad, Masoumeh
    Halmstad University, SWE.
    Mousavi, Muhammad Raza
    Halmstad University, SWE.
    Minhas, Nasir Mehmood
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Helgesson, Daniel
    Lund University, SWE.
    Kunze, Sebastian
    Halmstad University, SWE.
    Varshosaz, Mahsa
    Halmstad University, SWE.
    On the search for industry-relevant regression testing researchInngår i: Journal of Empirical Software Engineering, ISSN 1382-3256, E-ISSN 1573-7616Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Regression testing is a means to assure that a change in the software, or

    its execution environment, does not introduce new defects. It involves the expensive

    undertaking of rerunning test cases. Several techniques have been proposed

    to reduce the number of test cases to execute in regression testing, however, there

    is no research on how to assess industrial relevance and applicability of such techniques.

    We conducted a systematic literature review with the following two goals:

    rstly, to enable researchers to design and present regression testing research with

    a focus on industrial relevance and applicability and secondly, to facilitate the industrial

    adoption of such research by addressing the attributes of concern from the

    practitioners' perspective. Using a reference-based search approach, we identied

    1068 papers on regression testing. We then reduced the scope to only include papers

    with explicit discussions about relevance and applicability (i.e. mainly studies

    involving industrial stakeholders). Uniquely in this literature review, practitioners

    were consulted at several steps to increase the likelihood of achieving our aim of

    identifying factors important for relevance and applicability. We have summarised

    the results of these consultations and an analysis of the literature in three taxonomies,

    which capture aspects of industrial-relevance regarding the regression

    testing techniques. Based on these taxonomies, we mapped 38 papers reporting

    the evaluation of 26 regression testing techniques in industrial settings.

  • Silvander, Johan
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Component Selection with Fuzzy Decision Making2018Inngår i: Procedia Computer Science, Elsevier B.V. , 2018, Vol. 126, s. 1378-1386Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In many situations a decision maker (DM) would like to grade a component, or rank several components of the same type. Often a component type has many features, which are deemed as valuable by the DM. Other vital features are not known by the DM but are needed for the component to function. However, it should be possible to guide the DM to find the desired business solution, without putting a requirement of detailed knowledge of the component type on the DM. We propose a framework for component selection with the help of fuzzy decision making. The work is based on algorithms from fuzzy decision making, which we have adapted or extended. The framework was validated by practitioners, which found the framework useful. © 2018 The Author(s).

  • Wagner, Stefan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Extending characters of fixed point algebras2018Inngår i: Axioms, ISSN 2075-1680, Vol. 7, nr 4, artikkel-id 79Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A dynamical system is a triple (A, G, α) consisting of a unital locally convex algebra A, a topological group G, and a group homomorphism α: G → Aut(A) that induces a continuous action of G on A. Furthermore, a unital locally convex algebra A is called a continuous inverse algebra, or CIA for short, if its group of units A× is open in A and the inversion map i: A× → A×, a → a-1 is continuous at 1A. Given a dynamical system (A, G, α) with a complete commutative CIA A and a compact group G, we show that each character of the corresponding fixed point algebra can be extended to a character of A. © 2018 by the authors.

  • wilson, Magnus
    et al.
    Ericsson, SWE.
    Wnuk, Krzysztof
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Towards Multi-context Goal Modeling and Analysis with the Help of Intents2018Inngår i: 2018 IEEE 8th International Model-Driven Requirements Engineering Workshop (MoDRE), IEEE Computer Society Digital Library, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This vision paper discusses the need for enriching goal modeling with intents and context frame to provide much richer contextual information over goals and realization strategies. Based on the extensive experience of business modeling at Ericsson and a review of current goal modeling approaches, we suggest possible research directions towards enriching goal modeling.

  • Ouriques, Raquel
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Wnuk, Krzysztof
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Gorschek, Tony
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Berntsson Svensson, Richard
    Chalmers, SWE.
    Knowledge Management Strategies and Processes in Agile Software Development: A Systematic Literature Review2018Inngår i: International journal of software engineering and knowledge engineering, ISSN 0218-1940Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Knowledge-intensive companies that adopt Agile Software Development (ASD) relay on efficient implementation of Knowledge Management (KM) strategies to promotes different Knowledge Processes (KPs) to gain competitive advantage. This study aims to explore how companies that adopt ASD implement KM strategies utilizing practices that promote the KPs in the different organizational layers. Through a systematic literature review, we analyzed 32 primary studies, selected by automated search and snowballing in the extant literature. To analyze the data, we applied narrative synthesis. Most of the identified KM practices implement personalization strategies (81 %), supported by codification (19 %). Our review shows that the primary studies do not report KM practices in the strategic layer and two of them in the product portfolio layer; on the other hand, in the project layer, the studies report 33 practices that implement personalization strategy, and seven practices that implement codification. KM strategies in ASD promote mainly the knowledge transfer process with practices that stimulate social interaction to share tacit knowledge in the project layer. As a result of using informal communication, a significant amount of knowledge can be lost or not properly transferred to other individuals and, instead of propagating the knowledge, it remains inside a few individuals minds.