lnu.sePublikationer
Ändra sökning
Avgränsa sökresultatet
1234567 1 - 50 av 32018
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
• apa
• harvard1
• ieee
• modern-language-association-8th-edition
• vancouver
• Annat format
Fler format
Språk
• de-DE
• en-GB
• en-US
• fi-FI
• nn-NO
• nn-NB
• sv-SE
• Annat språk
Fler språk
Utmatningsformat
• html
• text
• asciidoc
• rtf
Träffar per sida
• 5
• 10
• 20
• 50
• 100
• 250
Sortering
• Standard (Relevans)
• Författare A-Ö
• Författare Ö-A
• Titel A-Ö
• Titel Ö-A
• Publikationstyp A-Ö
• Publikationstyp Ö-A
• Äldst först
• Nyast först
• Disputationsdatum (tidigaste först)
• Disputationsdatum (senaste först)
• Standard (Relevans)
• Författare A-Ö
• Författare Ö-A
• Titel A-Ö
• Titel Ö-A
• Publikationstyp A-Ö
• Publikationstyp Ö-A
• Äldst först
• Nyast först
• Disputationsdatum (tidigaste först)
• Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
• 1. Aaboe, L
Högskolan i Kalmar, Handelshögskolan BBS.
Incubator performance: An efficiency frontier analysis2008Ingår i: International Journal of Business Innovation and Research, ISSN 1751-0252, E-ISSN 1751-0260, Vol. 2, nr 4, s. 354-380Artikel i tidskrift (Refereegranskat)

Assessments and evaluations of incubators has been a topic of discussion for as long as incubators have been in existence due to the fact that there has not been an agreement on how to determine good performance. This paper demonstrates the use of Data Envelopment Analysis (DEA) when studying performance of incubators. More specifically, it does so within the four dimensions of cooperation with universities, business networks, external funding and competence development on a sample of 16 Swedish incubators. We show that DEA enables us to measure non-numerical dimensions, and to simultaneously take into account the efforts made by both the incubator and the outcomes. Moreover, DEA provides benchmarks and, based on a model that divides the incubators into four different groups, illustrates the difference between the benchmark and the incubators' current situation.

• 2. Aaboen, L
Högskolan i Kalmar, Handelshögskolan BBS.
Critical dimensions for technology transfer Incubator-facilitated links between finance, academia and NTBFs2008Ingår i: International Journal of Management and Enterprise Development, ISSN 1468-4330, E-ISSN 1741-8127, Vol. 5, nr 3, s. 331-335Artikel i tidskrift (Refereegranskat)

This paper explores incubator facilitation of technology transfer for their New Technology-Based Firms (NTBFs). Empirical evidence gathered from six interviews with incubator managers, together with a survey of 131 NTBFs in incubators in Sweden, in 2005, and the findings made in a survey of 273 NTBFs situated inside-and-outside Science Parks in 1999, are used for the exploration. It is suggested that incubators do facilitate technology transfer for their NTBFs. It is further suggested that the development towards increased ability to facilitate technology transfer will continue as a results of the efforts made on the incubator and systemic level.

• 3.
Chalmers tekniska högskola.
The University of Nottingham. School of Economics and Commercial Law, Department of Business Administration, Göteborg. Chalmers universitet.
Corporate governance and performance of small high-tech firms in Sweden2006Ingår i: Technovation, ISSN 0166-4972, E-ISSN 1879-2383, Vol. 26, nr 8, s. 955-968Artikel i tidskrift (Refereegranskat)

The approach uses data from a sample of 183 small high-tech firms, new technology-based firms (small high-tech firms) in Sweden (54 variables under the headings of work experience, board and advice, financing, motivation—performance priorities, technological innovation and strategy). This study identifies some core areas of importance in corporate governance. Few managers in this study had a strong background and experience of finance and the preparation of business. Only 64 per cent of the managers have had previous work experience before starting the firm. The survey makes it clear that the small high-tech firms are likely to have a strong link with banking institutions. The consequence of these links is that most of the firm's capital supply is from banks, and that there are strong ownership links between banks and industry. The background of the founder does seem to have had an effect on the problem of financing and ownership issues. It is private sector organizations (banks) and families that are most frequently consulted by small high-tech firms (However, low means). It is also the private and public sector organizations, in connection with external board membership, regional development agencies and banks that are most frequently consulted. In the future, it is reasonable to search for factor patterns that can begin to explain and predict the direction of corporate governance in small new technology-based firms.

• 4.
Växjö universitet, Fakulteten för humaniora och samhällsvetenskap, Institutionen för samhällsvetenskap.
Växjö universitet, Fakulteten för humaniora och samhällsvetenskap, Institutionen för samhällsvetenskap.
Digitalisering och social exklusion: Om medborgares användning av och attityder till Arbetsförmedlingens digitala tjänster2008Bok (Övrigt vetenskapligt)

Denna rapport studerar användarna av den digitala förvaltningen ur ett samhällsvetenskapligt perspektiv. Målet är att undersöka hur olika grupper av inskrivna vid den svenska Arbetsförmedlingen – formerade utifrån olika socialt strukturerande faktorer – använder och förhåller sig till såväl internet som den aktuella myndigheten och dess webbplats (www.ams.se).

Forskningen kring myndigheternas digitalisering domineras av studier som undersöker hur ny teknik implementeras i organisationer och vilka implikationer den har för dessa, medan användarstudier är sällsynta. Vår studie, som undersöker hur medborgare förhåller sig till internet i allmänhet och myndigheternas digitalisering i synnerhet, fyller därför ett tomrum på forskningsfältet.

Studiens material samlades in genom en enkät som skickades till 2000 slumpmässigt utvalda personer inskrivna vid Arbetsförmedlingen. Totalt erhölls 762 svar, vilket ger en svarsfrekvens på 40 procent. I huvudsak rörde enkätfrågorna de arbetssökandes användning av och attityder till såväl internet som Arbetsförmedlingens webbplats, men även frågor om gruppens attityder till myndigheten i allmänhet ställdes.

Resultaten visar att sociala faktorer, inte minst utbildning, är av stor betydelse för medborgarnas förmåga att använda Arbetsförmedlingens webbaserade tjänster. Lågutbildade använder myndighetens webbplats mer sällan än högutbildade, samtidigt som de även upplever den som svårare att använda. Vidare fann vi ett tydligt samband mellan de arbetssökande medborgarnas användning av och attityder till internet och Arbetsförmedlingens sajt. Grupper med en gynnsam relation till internet (i termer av tillgång, användning, erfarenhet och attityder) – framför allt högutbildade, tjänstemän och storstadsbor – använder också myndighetens webbplats flitigare, samtidigt som de tenderar att ha en mer positiv attityd till densamma (och vice versa). Följaktligen är det nödvändigt att tala om digitalt resursstarka och resurssvaga grupper.

De ojämlika relationerna till internet i allmänhet och Arbetsförmedlingens webbplats i synnerhet indikerar inte bara att digitaliseringen av förvaltningen är mer gynnsam för digitalt resursstarka grupper, utan också att den stänger ute digitalt resurssvaga grupper. Detta nya slags exklusion får implikationer för de arbetssökandes möjligheter att både ta sig in på arbetsmarknaden och agera som medborgare. Om myndigheternas digitalisering dessutom medför en omformering av medborgarskapet, i termer av ökat individuellt ansvar gentemot förvaltningen, kommer den digitala klyftan, såvida inget görs, befästa de digitalt resurssvaga gruppernas redan existerande utanförskap.

• 5.
Växjö universitet, Fakulteten för humaniora och samhällsvetenskap, Institutionen för samhällsvetenskap.
Växjö universitet, Fakulteten för humaniora och samhällsvetenskap, Institutionen för samhällsvetenskap.
Olika publiker, olika livsstilar: Om idrott, kultur och regional utveckling2008Bok (Övrigt vetenskapligt)

I föreliggande rapport studeras vilka sociala värden som elitidrotten och kulturen genererar för invånarna i landsortspräglade län som Blekinge, Halland, Kalmar och Kronoberg. Studien syftar till att lämna ett bidrag till den samhällsvetenskapliga idrottsforskningen, och ge ökad kunskap om idrottens och kulturens betydelse för den regionala utvecklingen.

Studiens material vilar på en postenkät skickad till 1500 slumpmässigt utvalda personer i respektive län. Det sammanlagda antalet besvarade enkäter uppgick till 3181 stycken, vilket ger en nettosvarsfrekvens på 54 procent.

Rapporten visar bland annat att både idrott och kultur värderas relativt högt och konsumeras i relativt stor utsträckning. Beträffande idrott konsumeras främst breddidrottsliga evenemang, och vad gäller kultur besöks bibliotek och biografer oftare än exempelvis teatrar.

Studien visar också att de kultur- respektive idrottsintresserade skiljer sig åt vad gäller demografi, men även vad gäller livsstil. De idrottsintresserade har en mer folklig och lantlig prägel, medan de kulturintresserade är att betrakta som en välutbildad kosmopolitisk grupp. Med tanke på de sistnämndas ökade rörlighet är satsningar på kultur ej att förringa. Denna typ av satsningar kan få denna resursstarka grupp att dels stanna kvar i landsorten, dels flytta in till densamma.

• 6.
Univ Tecnol Eindhoven, Netherlands.
Univ Tecnol Eindhoven, Netherlands. Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
Desafíos en la gestión de residuos sólidos para las ciudades de países en desarrollo [Solid waste management challenges for cities in developing countries]2015Ingår i: Tecnología en Marcha, ISSN 0379-3982, Vol. 28, nr 2, s. 141-168Artikel i tidskrift (Refereegranskat)

Solid waste management is a challenge for the cities' authorities in developing countries mainly due to the increasing generation of waste, the burden posed on the municipal budget as a result of the high costs associated to its management, the lack of understanding over a diversity of factors that affect the different stages of waste management and linkages necessary to enable the entire handling system functioning. An analysis of literature on the work done and reported mainly in publications from 2005 to 2011, related to waste management in developing countries, showed that few articles give quantitative information. The analysis was conducted in two of the major scientific journals, Waste Management Journal and Waste Management and Research. The objective of this research was to determine the stakeholders' action/behavior that have a role in the waste management process and to analyze influential factors on the system, in more than thirty urban areas in 22 developing countries in 4 continents. A combination of methods was used in this study in order to assess the stakeholders and the factors influencing the performance of waste management in the cities. Data was collected from scientific literature, existing data bases, observations made during visits to urban areas, structured interviews with relevant professionals, exercises provided to participants in workshops and a questionnaire applied to stakeholders. Descriptive and inferential statistic methods were used to draw conclusions. The outcomes of the research are a comprehensive list of stakeholders that are relevant in the waste management systems and a set of factors that reveal the most important causes for the systems' failure. The information provided is very useful when planning, changing or implementing waste management systems in cities.

• 7.
Ansaldo STS, Italy.
Ansaldo STS, Italy ; University of Naples ”Federico II”, Italy. Ansaldo STS, Italy. Ansaldo STS, Italy. Université “Federico II” di Napoli, Italy. Ansaldo STS, Italy.
UML based reverse engineering for the verification of railway control logics2007Ingår i: Proceedings of International Conference on Dependability of Computer Systems, DepCoS-RELCOMEX 2006, IEEE, 2007, s. 3-10Konferensbidrag (Refereegranskat)

The Unified Modeling Language (UML) is widely used as a high level object oriented specification language. In this paper we present a novel approach in which reverse engineering is performed using UML as the modelling language used to achieve a representation of the implemented system. The target is the core logic of a complex critical railway control system, which was written in an application specific legacy language. UML perfectly suited to represent the nature of the core logic, made up by concurrent and interacting processes, using a bottom-up approach and proper modeling rules. Each process, in fact, was strictly related to the management of a physically (resp. logically) well distinguished railway device (resp. functionality). The obtained model deeply facilitated the static analysis of the logic code, allowing for at a glance verification of correctness and compliance with higher-level specifications, and opened the way to refactoring and other formal analyses. © 2006 IEEE.

• 8.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
Designing Self-Adaptive Software Systems with Reuse2018Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)

Modern software systems are increasingly more connected, pervasive, and dynamic, as such, they are subject to more runtime variations than legacy systems. Runtime variations affect system properties, such as performance and availability. The variations are difficult to anticipate and thus mitigate in the system design.

Self-adaptive software systems were proposed as a solution to monitor and adapt systems in response to runtime variations. Research has established a vast body of knowledge on engineering self-adaptive systems. However, there is a lack of systematic process support that leverages such engineering knowledge and provides for systematic reuse for self-adaptive systems development.

This thesis proposes the Autonomic Software Product Lines (ASPL), which is a strategy for developing self-adaptive software systems with systematic reuse. The strategy exploits the separation of a managed and a managing subsystem and describes three steps that transform and integrate a domain-independent managing system platform into a domain-specific software product line for self-adaptive software systems.

Applying the ASPL strategy is however not straightforward as it involves challenges related to variability and uncertainty. We analyzed variability and uncertainty to understand their causes and effects. Based on the results, we developed the Autonomic Software Product Lines engineering (ASPLe) methodology, which provides process support for the ASPL strategy. The ASPLe has three processes, 1) ASPL Domain Engineering, 2) Specialization and 3) Integration. Each process maps to one of the steps in the ASPL strategy and defines roles, work-products, activities, and workflows for requirements, design, implementation, and testing. The focus of this thesis is on requirements and design.

We validate the ASPLe through demonstration and evaluation. We developed three demonstrator product lines using the ASPLe. We also conducted an extensive case study to evaluate key design activities in the ASPLe with experiments, questionnaires, and interviews. The results show a statistically significant increase in quality and reuse levels for self-adaptive software systems designed using the ASPLe compared to current engineering practices.

• 9.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Towards autonomic software product lines2011Ingår i: SPLC '11 Proceedings of the 15th International Software Product Line Conference, Volume 2, ACM Press, 2011, s. 44:1-44:8Konferensbidrag (Refereegranskat)

We envision an Autonomic Software Product Line (ASPL). The ASPL is a dynamic software product line that supports self adaptable products. We plan to use reflective architecture to model and develop ASPL. To evaluate the approach, we have implemented three autonomic product lines which show promising results. The ASPL approach is at initial stages, and require additional work. We plan to exploit online learning to realize more dynamic software product lines to cope with the problem of product line evolution. We propose on-line knowledge sharing among products in a product line to achieve continuous improvement of quality in product line products.

• 10.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
Architectural reasoning for dynamic software product lines2013Ingår i: Proceedings of the 17th International Software Product Line Conference co-located workshops, ACM Press, 2013, s. 117-124Konferensbidrag (Refereegranskat)

Software quality is critical in today's software systems. A challenge is the trade-off situation architects face in the design process. Designers often have two or more alternatives, which must be compared and put into context before a decision is made. The challenge becomes even more complex for dynamic software product lines, where domain designers have to take runtime variations into consideration as well. To address the problem we propose extensions to an architectural reasoning framework with constructs/artifacts to define and model a domain's scope and dynamic variability. The extended reasoning framework encapsulates knowledge to understand and reason about domain quality behavior and self-adaptation as a primary variability mechanism. The framework is demonstrated for a self-configuration property, self-upgradability on an educational product-line.

• 11.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
Architectural Reasoning Support for Product-Lines of Self-adaptive Software Systems: A Case Study2015Ingår i: Software Architecture: 9th European Conference, ECSA 2015, Dubrovnik/Cavtat, Croatia, September 7-11, 201 / [ed] Danny Weyns, Raffaela Mirandola, Ivica Crnkovic, Springer, 2015, s. 20-36Konferensbidrag (Refereegranskat)

Software architecture serves as a foundation for the design and development of software systems. Designing an architecture requires extensive analysis and reasoning. The study presented herein focuses on the architectural analysis and reasoning in support of engineering self-adaptive software systems with systematic reuse. Designing self-adaptive software systems with systematic reuse introduces variability along three dimensions; adding more complexity to the architectural analysis and reasoning process. To this end, the study presents an extended Architectural Reasoning Framework with dedicated reasoning support for self-adaptive systems and reuse. To evaluate the proposed framework, we conducted an initial feasibility case study, which concludes that the proposed framework assists the domain architects to increase reusability, reduce fault density, and eliminate differences in skills and experiences among architects, which were our research goals and are decisive factors for a system's overall quality.

• 12.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
ASPLe: a methodology to develop self-adaptive software systems with reuse2017Rapport (Övrigt vetenskapligt)

Advances in computing technologies are pushing software systems and their operating environments to become more dynamic and complex. The growing complexity of software systems coupled with uncertainties induced by runtime variations leads to challenges in software analysis and design. Self-Adaptive Software Systems (SASS) have been proposed as a solution to address design time complexity and uncertainty by adapting software systems at runtime. A vast body of knowledge on engineering self-adaptive software systems has been established. However, to the best of our knowledge, no or little work has considered systematic reuse of this knowledge. To that end, this study contributes an Autonomic Software Product Lines engineering (ASPLe) methodology. The ASPLe is based on a multi-product lines strategy which leverages systematic reuse through separation of application and adaptation logic. It provides developers with repeatable process support to design and develop self-adaptive software systems with reuse across several application domains. The methodology is composed of three core processes, and each process is organized for requirements, design, implementation, and testing activities. To exemplify and demonstrate the use of the ASPLe methodology, three application domains are used as running examples throughout the report.

• 13.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
Harnessing Variability in Product-lines of Self-adaptive Software Systems2015Ingår i: Proceedings of the 19th International Conference on Software Product Line: SPLC '15, ACM Press, 2015, s. 191-200Konferensbidrag (Refereegranskat)

This work studies systematic reuse in the context of self-adaptive software systems. In our work, we realized that managing variability for such platforms is different compared to traditional platforms, primarily due to the run-time variability and system uncertainties. Motivated by the fact that recent trends show that self-adaptation will be used more often in future system generation and that software reuse state-of-practice or research do not provide sufficient support, we have investigated the problems and possibly resolutions in this context. We have analyzed variability for these systems, using a systematic reuse prism, and identified a research gap in variability management. The analysis divides variability handling into four activities: (1) identify variability, (2) constrain variability, (3) implement variability, and (4) manage variability. Based on the findings we envision a reuse framework for the specific domain and present an example framework that addresses some of the identified challenges. We argue that it provides basic support for engineering self-adaptive software systems with systematic reuse. We discuss some important avenues of research for achieving the vision.

• 14.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV). Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV). Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
Rigorous architectural reasoning for self-adaptive software systems2016Ingår i: Proceedings: First Workshop on Qualitative Reasoning abut Software Architectures, QRASA 2016 / [ed] Lisa O'Conner, IEEE, 2016, s. 11-18Konferensbidrag (Refereegranskat)

Designing a software architecture requires architectural reasoning, i.e., activities that translate requirements to an architecture solution. Architectural reasoning is particularly challenging in the design of product-lines of self-adaptive systems, which involve variability both at development time and runtime. In previous work we developed an extended Architectural Reasoning Framework (eARF) to address this challenge. However, evaluation of the eARF showed that the framework lacked support for rigorous reasoning, ensuring that the design complies to the requirements. In this paper, we introduce an analytical framework that enhances eARF with such support. The framework defines a set of artifacts and a series of activities. Artifacts include templates to specify domain quality attribute scenarios, concrete models, and properties. The activities support architects with transforming requirement scenarios to architecture models that comply to required properties. Our focus in this paper is on architectural reasoning support for a single product instance. We illustrate the benefits of the approach by applying it to an example client-server system, and outline challenges for future work. © 2016 IEEE.

• 15.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM. Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Autonomic Software Product Lines (ASPL)2010Ingår i: ECSA '10 Proceedings of the Fourth European Conference on Software Architecture: Companion Volume / [ed] Carlos E. Cuesta, ACM Press, 2010, s. 324-331Konferensbidrag (Refereegranskat)

We describe ongoing work on a variability mechanism for Autonomic Software Product Lines (ASPL). The autonomic software product lines have self-management characteristics that make product line instances more resilient to context changes and some aspects of product line evolution. Instances sense the context, selects and bind the best component variants to variation-points at run-time. The variability mechanism we describe is composed of a profile guided dispatch based on off-line and on-line training processes. Together they form a simple, yet powerful variability mechanism that continuously learns, which variants to bind given the current context and system goals.

• 16.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM. Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Towards Autonomic Software Product Lines (ASPL) - A Technical Report2011Rapport (Övrigt vetenskapligt)

This report describes a work in progress to develop Autonomic Software Product Lines (ASPL). The ASPL is a dynamic software product line approach with a novel variability handling mechanism that enables traditional software product lines to adapt themselves at runtime in response to changes in their context, requirements and business goals. The ASPL variability mechanism is composed of three key activities: 1) context-profiling, 2) context-aware composition, and 3) online learning. Context-profiling is an offline activity that prepares a knowledge base for context-aware composition. The context-aware composition uses the knowledge base to derive a new product or adapts an existing product based on a product line's context attributes and goals. The online learning optimizes the knowledge base to remove errors and suboptimal information and to incorporate new knowledge. The three activities together form a simple yet powerful variability handling mechanism that learns and adapts a system at runtime in response to changes in system context and goals. We evaluated the ASPL variability mechanism on three small-scale software product lines and got promising results. The ASPL approach is, however, is yet at an initial stage and require improved development support with more rigorous evaluation.

• 17.
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM). Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
ASPLe: a methodology to develop self-adaptive software systems with systematic reuseManuskript (preprint) (Övrigt vetenskapligt)

More than two decades of research have demonstrated an increasing need for software systems to be self-adaptive. Self-adaptation is required to deal with runtime dynamics which are difficult to predict before deployment. A vast body of knowledge to develop Self-Adaptive Software Systems (SASS) has been established. We, however, discovered a lack of process support to develop self-adaptive systems with reuse. To that end, we propose a domain-engineering based methodology, Autonomic Software Product Lines engineering (ASPLe), which provides step-by-step guidelines for developing families of SASS with systematic reuse. The evaluation results from a case study show positive effects on quality and reuse for self-adaptive systems designed using the ASPLe compared to state-of-the-art engineering practices.

• 18.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM. Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Knowledge evolution in autonomic software product lines2011Ingår i: SPLC '11 Proceedings of the 15th International Software Product Line Conference, Volume 2, New York, NY, USA: ACM Press, 2011, s. 36:1-36:8Konferensbidrag (Refereegranskat)

We describe ongoing work in knowledge evolution management for autonomic software product lines. We explore how an autonomic product line may benefit from new knowledge originating from different source activities and artifacts at run time. The motivation for sharing run-time knowledge is that products may self-optimize at run time and thus improve quality faster compared to traditional software product line evolution. We propose two mechanisms that support knowledge evolution in product lines: online learning and knowledge sharing. We describe two basic scenarios for runtime knowledge evolution that involves these mechanisms. We evaluate online learning and knowledge sharing in a small product line setting that shows promising results.

• 19.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM. Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Modeling Variability in Product Lines Using Domain Quality Attribute Scenarios2012Ingår i: Proceedings of the WICSA/ECSA 2012 Companion Volume, ACM Press, 2012, s. 135-142Konferensbidrag (Refereegranskat)

The concept of variability is fundamental in software product lines and a successful implementation of a product line largely depends on how well domain requirements and their variability are specified, managed, and realized. While developing an educational software product line, we identified a lack of support to specify variability in quality concerns. To address this problem we propose an approach to model variability in quality concerns, which is an extension of quality attribute scenarios. In particular, we propose domain quality attribute scenarios, which extend standard quality attribute scenarios with additional information to support specification of variability and deriving product specific scenarios. We demonstrate the approach with scenarios for robustness and upgradability requirements in the educational software product line.

• 20. Abbasi, R.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Limits on a muon flux from Kaluza-Klein dark matter annihilations in the Sun from the IceCube 22-string detector2010Ingår i: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 81, nr 5, s. Article ID: 057101-Artikel i tidskrift (Refereegranskat)

A search for muon neutrinos from Kaluza-Klein dark matter annihilations in the Sun has been performed with the 22-string configuration of the IceCube neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atmospheric background has been observed. Upper limits have been obtained on the annihilation rate of captured lightest Kaluza-Klein particle (LKP) WIMPs in the Sun and converted to limits on the LKP-proton cross sections for LKP masses in the range 250-3000 GeV. These results are the most stringent limits to date on LKP annihilation in the Sun.

• 21. Abbasi, R.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
SEARCH FOR MUON NEUTRINOS FROM GAMMA-RAY BURSTS WITH THE IceCube NEUTRINO TELESCOPE2010Ingår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 710, nr 1, s. 346-359Artikel i tidskrift (Refereegranskat)

We present the results of searches for high-energy muon neutrinos from 41 gamma-ray bursts (GRBs) in the northern sky with the IceCube detector in its 22 string configuration active in 2007/2008. The searches cover both the prompt and a possible precursor emission as well as a model-independent, wide time window of -1 hr to + 3 hr around each GRB. In contrast to previous searches with a large GRB population, we do not utilize a standard Waxman-Bahcall GRB flux for the prompt emission but calculate individual neutrino spectra for all 41 GRBs from the burst parameters measured by satellites. For all of the three time windows, the best estimate for the number of signal events is zero. Therefore, we place 90% CL upper limits on the fluence from the prompt phase of 3.7 x 10(-3) erg cm(-2) (72 TeV-6.5 PeV) and on the fluence from the precursor phase of 2.3 x 10(-3) erg cm(-2) (2.2-55 TeV), where the quoted energy ranges contain 90% of the expected signal events in the detector. The 90% CL upper limit for the wide time window is 2.7 x 10(-3) erg cm(-2) (3 TeV-2.8 PeV) assuming an E-2 flux.

• 22. Abbasi, R.
Högskolan i Kalmar, Naturvetenskapliga institutionen.
SEARCH FOR HIGH-ENERGY MUON NEUTRINOS FROM THE "NAKED-EYE" GRB 080319B WITH THE IceCube NEUTRINO TELESCOPE2009Ingår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 701, nr 2, s. 1721-1731Artikel i tidskrift (Refereegranskat)

We report on a search with the IceCube detector for high-energy muon neutrinos from GRB 080319B, one of the brightest gamma-ray bursts (GRBs) ever observed. The fireball model predicts that a mean of 0.1 events should be detected by IceCube for a bulk Lorentz boost of the jet of 300. In both the direct on-time window of 66 s and an extended window of about 300 s around the GRB, no excess was found above background. The 90% CL upper limit on the number of track-like events from the GRB is 2.7, corresponding to a muon neutrino fluence limit of 9.5 x 10(-3) erg cm(-2) in the energy range between 120 TeV and 2.2 PeV, which contains 90% of the expected events.

• 23. Abbasi, R.
Högskolan i Kalmar, Naturvetenskapliga institutionen.
Extending the Search for Neutrino Point Sources with IceCube above the Horizon2009Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, nr 22, s. Article ID: 221102-Artikel i tidskrift (Refereegranskat)

Point source searches with the IceCube neutrino telescope have been restricted to one hemisphere, due to the exclusive selection of upward going events as a way of rejecting the atmospheric muon background. We show that the region above the horizon can be included by suppressing the background through energy-sensitive cuts. This improves the sensitivity above PeV energies, previously not accessible for declinations of more than a few degrees below the horizon due to the absorption of neutrinos in Earth. We present results based on data collected with 22 strings of IceCube, extending its field of view and energy reach for point source searches. No significant excess above the atmospheric background is observed in a sky scan and in tests of source candidates. Upper limits are reported, which for the first time cover point sources in the southern sky up to EeV energies.

• 24. Abbasi, R.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Calibration and characterization of the IceCube photomultiplier tube2010Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 618, nr 1-3, s. 139-152Artikel i tidskrift (Refereegranskat)

Over 5000 PMTs are being deployed at the South Pole to compose the IceCube neutrino observatory. Many are placed deep in the ice to detect Cherenkov light emitted by the products of high-energy neutrino interactions, and others are frozen into tanks on the surface to detect particles from atmospheric cosmic ray showers. IceCube is using the 10-in. diameter R7081-02 made by Hamamatsu Photonics. This paper describes the laboratory characterization and calibration of these PMTs before deployment. PMTs were illuminated with pulses ranging from single photons to saturation level. Parameterizations are given for the single photoelectron charge spectrum and the saturation behavior. Time resolution, late pulses and afterpulses are characterized. Because the PMTs are relatively large, the cathode sensitivity uniformity was measured. The absolute photon detection efficiency was calibrated using Rayleigh-scattered photons from a nitrogen laser. Measured characteristics are discussed in the context of their relevance to IceCube event reconstruction and simulation efforts. (C) 2010 Elsevier B.V. All rights reserved.

• 25. Abbasi, R.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Measurement of sound speed vs. depth in South Pole ice for neutrino astronomy2010Ingår i: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 33, nr 5-6, s. 277-286Artikel i tidskrift (Refereegranskat)

We have measured the speed of both pressure waves and shear waves as a function of depth between 80 and 500 m depth in South Pole ice with better than 1% precision. The measurements were made using the South Pole Acoustic Test Setup (SPATS), an array of transmitters and sensors deployed in the ice at the South Pole in order to measure the acoustic properties relevant to acoustic detection of astrophysical neutrinos. The transmitters and sensors use piezoceramics operating at similar to 5-25 kHz. Between 200 m and 500 m depth, the measured profile is consistent with zero variation of the sound speed with depth, resulting in zero refraction, for both pressure and shear waves. We also performed a complementary study featuring an explosive signal propagating vertically from 50 to 2250 m depth, from which we determined a value for the pressure wave speed consistent with that determined for shallower depths, higher frequencies, and horizontal propagation with the SPATS sensors. The sound speed profile presented here can be used to achieve good acoustic source position and emission time reconstruction in general, and neutrino direction and energy reconstruction in particular. The reconstructed quantities could also help separate neutrino signals from background. (C) 2010 Elsevier B.V. All rights reserved.

• 26. Abbasi, R.
Högskolan i Kalmar, Naturvetenskapliga institutionen.
First Neutrino Point-Source Results from the 22 String Icecube Detector2009Ingår i: The Astrophysical Journal Letters, ISSN 2041-8205, Vol. 701, nr 1, s. L47-L51Artikel i tidskrift (Refereegranskat)

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-2008 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of live time. The final sample of 5114 neutrino candidate events agrees well with the expected background of atmospheric muon neutrinos and a small component of atmospheric muons. No evidence of a point source is found, with the most significant excess of events in the sky at 2.2Ïƒ after accounting for all trials. The average upper limit over the northern sky for point sources of muon-neutrinos with E â€“2 spectrum is ##IMG## [http://ej.iop.org/images/1538-4357/701/1/L47/apjl318527ieqn1.gif] $E^2\,Φ _ν _μ < 1.4 \,\,\times\,\, 10^-11\; \mathrmTeV\;cm^-2\;\mathrms^-1$ , in the energy range from 3Â TeV to 3Â PeV, improving the previous best average upper limit by the AMANDA-II detector by a factor of 2.

• 27. Abbasi, R.
Högskolan i Kalmar, Naturvetenskapliga institutionen.
Limits on a Muon Flux from Neutralino Annihilations in the Sun with the IceCube 22-String Detector2009Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, nr 20, s. Article ID: 201302-Artikel i tidskrift (Refereegranskat)

A search for muon neutrinos from neutralino annihilations in the Sun has been performed with the IceCube 22-string neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atmospheric background has been observed. Upper limits have been obtained on the annihilation rate of captured neutralinos in the Sun and converted to limits on the weakly interacting massive particle (WIMP) proton cross sections for WIMP masses in the range 250-5000 GeV. These results are the most stringent limits to date on neutralino annihilation in the Sun.

• 28. Abbasi, R.
Högskolan i Kalmar, Naturvetenskapliga institutionen.
Determination of the atmospheric neutrino flux and searches for new physics with AMANDA-II2009Ingår i: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 79, nr 10, s. Article ID: 102005-Artikel i tidskrift (Refereegranskat)

The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be used to search for various phenomenological signatures of quantum gravity in the neutrino sector, such as violation of Lorentz invariance or quantum decoherence. Analyzing a set of 5511 candidate neutrino events collected during 1387 days of livetime from 2000 to 2006, we find no evidence for such effects and set upper limits on violation of Lorentz invariance and quantum decoherence parameters using a maximum likelihood method. Given the absence of evidence for new flavor-changing physics, we use the same methodology to determine the conventional atmospheric muon neutrino flux above 100 GeV.

• 29. Abbasi, R.