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Sökning: swepub > Malmö högskola > Engelska > Blekinge Tekniska Högskola

  • Resultat 1-10 av 23
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  • Bjarnason, Elizabeth, et al. (författare)
  • Challenges and Practices in Aligning Requirements with Verification and Validation
  • 2014
  • Ingår i: Journal of Empirical Software Engineering. - Springer. - 1382-3256. ; 19:6, s. 1809-1855
  • Tidskriftsartikel (refereegranskat)abstract
    • Weak alignment of requirements engineering (RE) with verification and validation (VV) may lead to problems in delivering the required products in time with the right quality. For example, weak communication of requirements changes to testers may result in lack of verification of new requirements and incorrect verification of old invalid requirements, leading to software quality problems, wasted effort and delays. However, despite the serious implications of weak alignment research and practice both tend to focus on one or the other of RE or VV rather than on the alignment of the two. We have performed a multi-unit case study to gain insight into issues around aligning RE and VV by interviewing 30 practitioners from 6 software developing companies, involving 10 researchers in a flexible research process for case studies. The results describe current industry challenges and practices in aligning RE with VV, ranging from quality of the individual RE and VV activities, through tracing and tools, to change control and sharing a common understanding at strategy, goal and design level. The study identified that human aspects are central, i.e. cooperation and communication, and that requirements engineering practices are a critical basis for alignment. Further, the size of an organisation and its motivation for applying alignment practices, e.g. external enforcement of traceability, are variation factors that play a key role in achieving alignment. Our results provide a strategic roadmap for practitioners improvement work to address alignment challenges. Furthermore, the study provides a foundation for continued research to improve the alignment of RE with VV.
  • Hellström, Amanda, et al. (författare)
  • Association between Sleep Disturbances and Leisure Activities in the Elderly
  • 2014
  • Ingår i: Sleep Disorders. - Hindawi. - 2090-3545. ; 2014:Article ID 595208
  • Tidskriftsartikel (refereegranskat)abstract
    • It has been suggested that physical or social activity is associated with fewer sleep disturbances among elderly people. Women report more sleep disturbances than men, which could indicate a variation in activity patterns between the genders. The aim of this study was to investigate associations between sleep disturbances and leisure activities in men and women (n = 945) aged ≥60 years in a Swedish population. Sleep disturbances were measured using eight dichotomous questions and seventeen variables, covering a wide range of leisure activities. Few leisure activities were found to be associated with sleep disturbances and their importance decreased when the models were adjusted for confounders and gender interactions. After clustering the leisure activities and investigating individual activities, socio-intellectual activities were shown to be significant for sleep. However, following adjustment for confounders and gender interactions, home maintenance was the only activity significant for sleep. Being a female increased the effect of home maintenance. Besides those leisure activities, poor/fair self-rated health (OR 7.50, CI: 4.27-11.81) and being female (OR 4.86, CI: 2.75-8.61) were found to have the highest association with poor sleep. Leisure activities pursued by elderly people should focus on activities of a socio-intellectual nature, especially among women, to promote sleep.
  • Bjerkén, Christina, et al. (författare)
  • Fracture Mechanisms of a Thin Elastic Plastic Laminate
  • 2006
  • Konferensbidrag (refereegranskat)abstract
    • The fracture toughness of a polymer-metal laminate composite is obtained by mechanical testing of a specimen containing a pre-crack. The laminate is a material used for packaging. It consists of a thin aluminium foil and a polymer coating. A centre cracked panel test geometry is used. Each of the layers forming the laminate is also tested separately. The result is compared with the measured fracture strength of the individual layers. It is observed that the load carrying capacity increases dramatically for the laminate. At the strain when peak load is reached for the laminate only aluminium is expected to carry any substantial load because of the low stiffness of the LDPE. However, the strength of the laminate is almost twice the strength of the aluminium foil. The reason seems to be that the aluminium forces the polymer to absorb large quantities of energy at small nominal strain. The toughness compares well with the accumulated toughness of all involved layers. Possible fracture of the interface between the layers is discussed.
  • Gustafsson, Markus, et al. (författare)
  • Case managers for older persons with multi-morbidity and their everyday work -- a focused ethnography
  • 2013
  • Ingår i: BMC Health Services Research. - Biomed Central. - 1472-6963. ; 13:496
  • Tidskriftsartikel (refereegranskat)abstract
    • Background Modern-day health systems are complex, making it difficult to assure continuity of care for older persons with multi-morbidity. One way of intervening in a health system that is leading to fragmented care is by utilising Case Management (CM). CM aims to improve co-ordination of healthcare and social services. To better understand and advance the development of CM, there is a need for additional research that provides rich descriptions of CM in practice. This knowledge is important as there could be unknown mechanisms, contextual or interpersonal, that contribute to the success or failure of a CM intervention. Furthermore, the CM intervention in this study is conducted in the context of the Swedish health system, which prior to this intervention was unfamiliar with this kind of coordinative service. The aim of this study was to explore the everyday work undertaken by case managers within a CM intervention, with a focus on their experiences. Methods The study design was qualitative and inductive, utilising a focused ethnographic approach. Data collection consisted of participant observations with field notes as well as a group interview and individual interviews with nine case managers, conducted in 2012/2013. The interviews were recorded, transcribed verbatim and subjected to thematic analysis. Results An overarching theme emerged from the data: Challenging current professional identity, with three sub-themes. The sub-themes were 1) Adjusting to familiar work in an unfamiliar role; 2) Striving to improve the health system through a new role; 3) Trust is vital to advocacy. Conclusions Findings from this study shed some light on the complexity of CM for older persons with multi-morbidity, as seen from the perspective of case managers. The findings illustrate how their everyday work as case managers represents a challenge to their current professional identity. These findings could help to understand and promote the development of CM models aimed at a population of older persons with complex health needs.
  • Kao-Walter, Sharon, et al. (författare)
  • A Finite Element Analysis of a Crack Penetrating or Deflecting into an Interface in a Thin Laminate
  • 2006
  • Ingår i: Key Engineering Materials. - Switzerland : Trans. Tech. Publications. - 1013-9826. ; 312, s. 173-178
  • Tidskriftsartikel (refereegranskat)abstract
    • The crack tip driving force of a crack growing from a pre-crack that is perpendicular to and terminating at an interface between two materials is investigated using a linear fracture mechanics theory. The analysis is performed both for a crack penetrating the interface, growing straight ahead, and for a crack deflecting into the interface. The results from finite element calculations are compared with asymptotic solutions for infinitesimally small crack extensions. The solution is found to be accurate even for fairly large amounts of crack growth. Further, by comparing the crack tip driving force of the deflected crack with that of the penetrating crack, it is shown how to control the path of the crack by choosing the adhesion of the interface relative to the material toughness.
  • Bakhtyar, Shoaib, et al. (författare)
  • Achieving services when turning a waybill into an e-waybill
  • 2011
  • Konferensbidrag (refereegranskat)abstract
    • The focus of this paper is to present potential electronic waybill (e-waybill) solutions for a traditional waybill with the potential for supporting different Intelligent Transport System (ITS) services, such as, identification of freight, automating the exchange of content-related data for regulatory or commercial purposes, etc. At present there are some initiatives, for instance, by the International Air Transport Association (IATA) and the e-Freight framework, for achieving solutions that can handle e-waybills. Both these solutions focus on actor-to-actor communication, however we hypothesize that the storage of a waybill’s data both locally and centrally (i.e. actor-to-actor as well as goods-to-actor communication) can support more services than only central storage of the waybill’s data. Further we look at the information required and possible communication links between different actors in order to identify different ITS services that can be achieved through an e-waybill solution. We then map this information on to the e-waybill solutions that we have proposed, which will allow us to identify which services are supported by the different e-waybill solutions.
  • Björgvinsson, Erling (författare)
  • Socio-Material Mediations
  • 2007
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • The thesis discusses lessons learned and issues raised when exploring how self-produced rich media can facilitate sharing of meaning between healthcare professionals at an intensive care unit and between healthcare professionals and patients within a hand surgery clinic. Design experiments conducted at the intensive care unit focused on how healthcare professionals could collaboratively produce ‘best practice’ videos displayed on handheld devices and accessed through barcodes placed out in the unit. The making of the videos it is argued can be seen as a temporary convergence of different views when reifying ‘best practice.’ Design experiments conducted at the hand surgery clinic focused on how healthcare professional and patients collaboratively could produce, during consultations, rich media documents that are tailored to the patients’ specific needs. The rich media documents made can be seen as a temporary convergence of two distinct practices; namely that of hand surgery treatment and the practice of everyday life. Making of rich media documents in both projects resulted in developing relational spaces of informal learning, which engendered the making of rich reifications that function well in close relation to participation. To engender the making of the rich media documents demanded the establishment and hardening of a socio-technical infrastructure which can be seen as a temporary convergence between tools and practices where both the tools and practices are changed. In both cases using these videos in turn demanded that the videos, a form of local collaborative hardenings, needed to be translated anew and so to speak “defrosted.” The design consequences are that designers need to acknowledge materiality as an ongoing process which is given meaning through participation over time within and across communities of practice. Materiality and human agency in this instance are not seen as discrete elements, but rather highly intertwined. The second design consequence is that we need to acknowledge the complexity, partiality, and multiplicity of such relational spaces. Methodologically, the consequences are that it is important to consider where the designers position themselves and the artifacts in the network of relations, since different positioning will have different implications for the subsequent spaces of action.
  • Davidsson, Paul, et al. (författare)
  • Towards a Prediction Model for People Movements in Urban Areas
  • 2013
  • Konferensbidrag (refereegranskat)abstract
    • The aim of this work is to develop a new type of service for predicting and communicating urban activity. This service provides short-term predictions (hours to days), which can be used as a basis for different types of resource allocation and planning, e.g. concerning public transport, personnel, or marketing. The core of the service consists of a forecasting engine that based on a prediction model processes data on different levels of detail and from various providers. This paper explores the requirements and features of the forecast engine. We conclude that agent-based modeling seems as the most promising approach to meet these requirements. Finally, some examples of potential applications are described along with analyses of scientific and engineering issues that need to be addressed.
  • Holmgren, Johan, et al. (författare)
  • Agent-based simulation of freight transport between geographical zones
  • 2013
  • Konferensbidrag (refereegranskat)abstract
    • We present TAPAS-Z, which is an agent-based freight transport analysis model for simulation of decision-making and transport activities. TAPAS-Z is a further development of a simulation model called TAPAS, and it has improved support for simulation of transport in large geographical regions. It is based on the principles that shipments are simulated for chosen supplier-consumer relations in a geographic region, and that the geographic locations of suppliers and consumers are randomly varied for each shipment. In TAPAS-Z, one supplier represents all real-world suppliers in a geographic zone, and one consumer represents all real-world consumers in a zone. In that way, TAPAS-Z is able to capture some of the diversity in freight transport that is caused by the varying geographic locations of senders and receivers, and which is important when assessing the impact of transport policy and infrastructural measures.
  • Holmgren, Johan, et al. (författare)
  • Multi-Agent-Based Simulation for Analysis of Transport Policy and Infrastructure Measures
  • 2012
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we elaborate on the usage of multi-agent-based simulation (MABS) for quantitative impact assessment of transport policy and infrastructure measures. We provide a general discussion on how to use MABS for freight transport analysis, focusing on issues related to input data management, validation and verification, calibration, output data analysis, and generalization of results. The discussion is built around an agent-based transport chain simulation tool called TAPAS (Transportation And Production Agent-based Simulator) and a simulation study concerning a transport chain around the Southern Baltic Sea.
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