| 1. |
- Akesson, Alfred, et al.
(författare)
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ComPOS : Composing Oblivious Services
- 2019
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Ingår i: 2019 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2019. - 9781538691519 ; , s. 132-138
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Konferensbidrag (refereegranskat)abstract
- Future internet-of-things systems need to be able to combine heterogeneous services and support weak connectivity. In this paper, we introduce ComPOS, a new domain-specific language for composing services in IoT systems. We show how Maria, a bird watcher, can use ComPOS to build a system that allows her to spy on birds in the garden while she is not at home. We demonstrate how ComPOS handles the unpredictable nature of IoT system by analysing in what cases Maria's system is still useful when some devices are unavailable.
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| 2. |
- Asklund, Ulf, et al.
(författare)
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Support for consistent merge
- 2000
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Ingår i: Proceedings of SCM-10, 10th International Workshop on Software Configuration Management: New Practices, New Challanges and New Boundaries.
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Konferensbidrag (refereegranskat)abstract
- In this paper we discuss a powerful way to support merge of concurrently developed documents (such as programs). Existing merge tools require the user to decide for each individual change if it should be included or not. We show how it is possible to let the user to decide to include (or exclude) several changes in one go. In our prototype we use the structure of the document in order to support the user in making consistent merge decisions.
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| 3. |
- Asklund, Ulf, et al.
(författare)
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The unified extensional versioning model
- 1999
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Ingår i: System Configuration Management - 9th International Symposium, SCM 1999, Proceedings. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1611-3349 .- 0302-9743. - 354066484X - 9783540664840 ; 1675, s. 100-122
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Konferensbidrag (refereegranskat)abstract
- Versioning of components in a system is a well-researched field where various adequate techniques have already been established. In this paper, we look at how versioning can be extended to cover also the structural aspects of a system. There exist two basic techniques for versioning - intentional and extensional - and we propose a unified extensional versioning model for versioning of both components and structure in the same way. The unified model is described in detail and three different policies that can be implemented on top of the general model are exemplified/illustrated by three prototype tools constructed by the authors. The model is analysed with respect to the number of versions and con- figurations it generates and has to manage. Finally, the unified extensional model is compared to more traditional intentional models on some important parameters. The conclusions are that the unified model is indeed viable. It not only pro- vides the functionality offered by the intentional model with respect to flexibility during development and management of combinatoric complexity, but also offers a framework for management of configurations that enables systems to provide much more advanced support than is commonly available.
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| 4. |
- Bendix, Lars, et al.
(författare)
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Teaching software development using extreme programming
- 2008
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Ingår i: Lecture Notes in Computer Science. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1611-3349 .- 0302-9743. - 9783540779339 - 9783540779346 ; 4821, s. 166-189
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Tidskriftsartikel (refereegranskat)abstract
- Software development is a complex area and extensive practice and reflection is required in order to obtain a good understanding of the different tasks involved in going from idea to deliverable software. To help in providing this understanding, we have developed a team programming course based on extreme programming and a coaching course. We discuss how these courses affect the curriculum, the design of the courses, and our experience from running them for four years, involving over 100 students per year. We also discuss how we have used the extreme programming approach to support the learning cycle through the use of iterative learning, peer learning and a fixed-time budge
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| 5. |
- Berndt, Sonja I., et al.
(författare)
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Genome-wide meta-analysis identifies 11 new loci for anthropometric traits and provides insights into genetic architecture
- 2013
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Ingår i: Nature Genetics. - : Springer Science and Business Media LLC. - 1061-4036 .- 1546-1718. ; 45:5, s. 501-U69
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Tidskriftsartikel (refereegranskat)abstract
- Approaches exploiting trait distribution extremes may be used to identify loci associated with common traits, but it is unknown whether these loci are generalizable to the broader population. In a genome-wide search for loci associated with the upper versus the lower 5th percentiles of body mass index, height and waist-to-hip ratio, as well as clinical classes of obesity, including up to 263,407 individuals of European ancestry, we identified 4 new loci (IGFBP4, H6PD, RSRC1 and PPP2R2A) influencing height detected in the distribution tails and 7 new loci (HNF4G, RPTOR, GNAT2, MRPS33P4, ADCY9, HS6ST3 and ZZZ3) for clinical classes of obesity. Further, we find a large overlap in genetic structure and the distribution of variants between traits based on extremes and the general population and little etiological heterogeneity between obesity subgroups.
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| 6. |
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| 7. |
- Ergawy, Amr, et al.
(författare)
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Device discovery for the PalCom pervasive middleware with eliminated cross-networks periodic heart-beat messages
- 2014
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Ingår i: Procedia Computer Science. - : Elsevier BV. - 1877-0509. ; 37, s. 64-71
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Konferensbidrag (refereegranskat)abstract
- Service discovery is central in pervasive middleware systems, built on top of the communication substrate using the more fundamental mechanisms for device discovery. In mobile pervasive systems devices come and go, and switch network frequently, demanding support for device discovery across heterogeneous networks. We present the design of a device discovery mechanism for the PalCom middleware that eliminates the need for cross-network periodic keep-alive messages while still supporting timely detection of missing devices, i.e. undiscovery. The design has been implemented and is evaluated against the simplistic approach of flooding the inter-connected networks with keep-alive messages. (C) 2014 The Authors. Published by Elsevier B.V.
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| 8. |
- Ergawy, Amr, et al.
(författare)
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Media Abstraction Framework for the Pervasive Middleware PalCom
- 2014
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Ingår i: [Host publication title missing]. ; , s. 68-75
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Konferensbidrag (refereegranskat)abstract
- Pervasive middleware systems are important for enabling the configuration and coordination of the services provided by devices in pervasive environments. PalCom is an example of such a system that aims to enable interaction among pervasive services over heterogeneous networks. In this paper we discuss the need for providing networking-media independent messaging among pervasive devices, and identify the problem of designing a media abstraction framework for a pervasive middleware. We identify a number of design principles and features that need to be satisfied by such a framework. The most important of these principles is the separation of networking protocol aspects into abstraction representations, which are exposed in a unified format to upper layers of PalCom, and communication mechanisms which are hidden by media-specific implementations of our proposed media-abstraction framework for PalCom. Also, we explain our implementation and evaluation of that framework.
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| 9. |
- Ergawy, Amr, et al.
(författare)
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Supporting Distance Vector Routing Over Device Discovery Flows in the Pervasive Middleware PalCom
- 2015
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Ingår i: Procedia Computer Science. - : Elsevier BV. - 1877-0509. ; 52, s. 145-152
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Konferensbidrag (refereegranskat)abstract
- PalCom is a pervasive middleware that enables users to combine services from different devices into assemblies, or usage scenarios. The mechanism of device discovery in PalCom builds an ad-hoc network of interconnected devices while replacing cross-network periodic keep-alive messages with timely forwarded events that notify devices about the discovery and undiscovery of each other. Moreover, the device discovery mechanism is decoupled from any specific routing decisions mechanism. In this paper, we present a design that builds on this flexibility to add distance vector routing to PalCom while inheriting the event based cross-network device discovery for updating routing tables on interacting devices. The proposed design has been implemented and evaluated against a network with links that continuously change their availability.
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| 10. |
- Ergawy, Amr, et al.
(författare)
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Synchronizing Device Discovery on Loss of Update Messages in the Pervasive Middleware Palcom
- 2016
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Ingår i: Procedia Computer Science. - : Elsevier BV. - 1877-0509. ; 94, s. 347-352
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Tidskriftsartikel (refereegranskat)abstract
- PalCom is a pervasive middleware that enables users to combine the services on devices into useful configurations. Interconnected PalCom devices can discover, and keep track of, the existence of each other by exchanging periodic heartbeats within local networks, and once-sent device appearance/disappearance notifications across interconnected networks. This approach has the advantage of eliminating the need to forward periodic heartbeats beyond the boundaries of the local networks of their originator devices. However, when a device appearance/disappearance notification is sent only once over an unreliable channel, there is a possibility of losing that notification. As a result, the device discovery information on PalCom devices will be out-of-sync. In this paper, we present the design, model-based evaluation, and the implementation status of a solution to this synchronization problem.
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