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  • 1.
    Dobslaw, Felix
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Larsson, Aron
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    An Object-Oriented Model in Support of Context-Aware Mobile Applications2010Conference paper (Refereed)
    Abstract [en]

    Intelligent and context-aware mobile services require usersand applications to share information and utilize services from remotelocations. Thus, context information from the users must be structuredand be accessible to applications running in end-devices. In response tothis challenge, we present a shared object-oriented meta model for a persistentagent environment. The approach enables agents to be contextawarefacilitating the creation of ambient intelligence demonstrated bya sensor-based scenario. The agents are context-aware as agent actionsare based upon sensor information, social information, and the behaviorof co-agents.

  • 2.
    Forsström, Stefan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Location-Based Ubiquitous Context Exchange in Mobile Environments2010In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering Vol 68, Springer, 2010, p. 177-187Conference paper (Refereed)
    Abstract [en]

    Context-aware applications and services require ubiquitous access to context information of users. The limited scalability of centralized servers used in the provisioning of context information mandates the search for scalable peer-to-peer protocols. Furthermore, unnecessary signaling must be avoided in large-scale context networks, when location-based services only require nodes in a certain area with which to communicate context. To this end, we propose a lightweight model for composing and maintaining unstructured location-scoped networks of peer-to-peer nodes, which gossips in order to ensure quality of service for each user. The model is implemented in a prototype application running in a mobile environment, which is evaluated with respect to real-time properties. This model can also be extended to include more context dimensions, other than location.

  • 3.
    Forsström, Stefan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Norling, Roger
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Dissemination of Anonymised Context Information by Extending the DCXP Framework2010In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering Volume 32, Springer, 2010, p. 57-66Conference paper (Refereed)
    Abstract [en]

    The increasing ubiquity of context aware services and systems has been primarily underpinned by the use of centralised servers employing protocols that do no scale well for real time distribution and acquisition of neither sensor data nor dependent services.Any shift from this generic sensor framework mandated a new thinking where sensor data was capable of being propagated in real time using protocols and data models which serve to reduce unnecessary communication overhead. DCXP is proposed as an alternative architecture for the real time distribution of context information to ubiquitous mobile services.As a P2P based distributed protocol, it inherently poses the challenge of user anonymity across the system. In this paper we briefly present DCXP along with further work to enable the anonymised dissemination of sensor information within the architecture.Such a solution would have a negligible impact on the overall scalability and performance of DCXP.

  • 4.
    Kanter, Theo
    et al.
    Department of Computer and System Sciences Stockholm University.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Jennehag, Ulf
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    MediaSense – an Internet of Things Platform for Scalable and Decentralized Context Sharing and Control2012Conference paper (Refereed)
    Abstract [en]

    Research in Internet-of-Things infrastructures hasso far mainly been focused on connecting sensors and actuatorsto the Internet, while associating these devices to applicationsvia web services. This has contributed to making the technologyaccessible in areas such as smart-grid, transport, health, etc.These early successes have hidden the lack of support forsensor-based applications to share information and limitationsin support for applications to access sensors and actuatorsglobally. We address these limitations in an novel open-sourceplatform, MediaSense. MediaSense offers scalable, seamless,real-time access to global sensors and actuators via hetero-geneous network infrastructure. This paper presents a setof requirements for Internet-of-Things applications support,an overview of our architecture, and application prototypescreated in order to verify the approach in a test bed withusers connected from heterogeneous networks.

  • 5.
    Kanter, Theo
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Pettersson, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Ubiquitous Mobile Awareness from Sensor Networks2010In: Enabling Context-Aware Web Services: Methods, Architectures, and Technologies, CRC Press, 2010, p. 449-468Chapter in book (Other academic)
    Abstract [en]

    Users require applications and services to be available everywhere, enabling users to focus on what is important to them. Therefore, context information from users (e.g., spatial data, preferences, available connectivity and devices, etc.) needs to be accessible to systems that deliver services via a heterogeneous infrastructure. We present a novel approach to support ubiquitous sensing and availability of context to services and applications. This approach offers a scalable, distributed storage of context derived from sensor networks wirelessly attached to mobile phones and other devices. The support handles frequent updates of sensor information and is interoperable with presence services in 3G mobile systems, thus enabling ubiquitous sensing applications. We demonstrate these concepts and the principle operation in a sample ubiquitous mobile awareness service. The importance of this contribution, in comparison to earlier work, lies in the availability of real-time ubiquitous sensing to both applications on the Internet as well as applications in mobile systems.

  • 6.
    Kanter, Theo
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Scenarios, Research Issues, and Architecture for Ubiquitous Sensing2010In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering  Vol 68, Springer, 2010, p. 285-297Conference paper (Refereed)
    Abstract [en]

    This paper describes research issues and work-in-progress concerning ubiquitous sensing. We present scenarios where the current approaches are deficient in addressing the needs for ubiquitous sensing in services and applications on the Future Internet, involving the massive sharing of information from sensors via heterogeneous networks. We propose an information-centric architecture for real-time ubiquitous sensing which capitalizes on the proposed locator/identifier split, thus extending the Network of Information (NetInf) approach. From this we identify the challenges for which we present work-in-progress within the framework of the EU-funded MediaSense project. Firstly, we integrate sensors as addressable objects, exposed by means of sensor gateways and relocatable abstract interfaces. Sensor information is thus made available to applications solely based on identity. Secondly, sensor information is made available in a distributed data model towards searching and browsing. Finally, we evaluate the effectiveness of the architecture in proof-of-concept applications for intelligent commuting, environmental monitoring and seamless media transfer, utilizing two different sensor platforms.

  • 7.
    Kanter, Theo
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Pettersson, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Norling, Roger
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Distributed Context Support for Ubiquitous Mobile Awareness Services2009In: 2009 Fourth International ICST Conference on Communications and Networking in China. ChinaCom'09., IEEE conference proceedings, 2009, p. 869-873Conference paper (Refereed)
    Abstract [en]

    Context-aware applications and services require ubiquitous access to context information about the users or sensors such as preferences, spatial & environmental data, available connectivity, and device capabilities. Systems for the brokering or the provisioning of context data via wireless networks do so with centralized servers or by employing protocols that do not scale well with real-time distribution capabilities. In other cases, such as the extending of presence systems, the data models are limited in expressive capabilities and consequently incur unnecessary signaling overhead. This paper presents a distributed protocol, the Distributed Context eXchange Protocol (DCXP), and an architecture for the real-time distribution of context information to ubiquitous mobile services: We present the architecture and its principle operation in a sample ubiquitous mobile awareness service. Preliminary results indicate that our approach scales well for the ubiquitous provision of context data in real-time to clients on the Internet via 3G wireless systems. Performed measurements show that DCXP can reduce the time to process context data with a factor of 20 compared to similar approaches.

     

  • 8.
    Kanter, Theo
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kardeby, Victor
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Pettersson, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    The MediaSense Framework2009In: Proceedings - 2009 4th International Conference on Digital Telecommunications, ICDT 2009, New York: IEEE conference proceedings, 2009, p. 144-147Conference paper (Refereed)
    Abstract [en]

    Mobile telecommunication is evolving rapidly. People no longer only communicate with each other regardless of time and place, but also share other information that is important for tasks with which they are involved. In response to this growing trend the MediaSense framework addresses the intelligent delivery of any information to any host, anywhere, based on context-aware information regarding personal preferences, presence information, and sensor values. This includes another challenge to achieve seamless delivery, especially of multimedia content, and multimodal services via heterogeneous connections.

  • 9.
    Kardeby, Victor
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    The MediaSense Framework: Ranking Sensors in a Distributed Architecture2011Conference paper (Refereed)
    Abstract [en]

    Mobile telecommunication is evolving rapidly. People no longer only communicate with each other regardless of time and place, but also share other information that is important for the tasks with which they are involved. In response to this growing trend, the Media Sense framework addresses the intelligent delivery of any information to any host, anywhere, based on context-aware information regarding personal preferences, presence information, and sensor values. The focus of this paper is the overall framework, the handling of user profiles, management of context information, real-time distribution and proof of concepts.

  • 10.
    Kardeby, Victor
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Forsström, Stefan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Österberg, Patrik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    The updated mediasense framework2010In: 5th International Conference on Digital Telecommunications, ICDT 2010, Athens, Glyfada: IEEE conference proceedings, 2010, p. 48-51Conference paper (Refereed)
    Abstract [en]

    Mobile telecommunication is evolving rapidly. People no longer only communicate with each other regardless of time and place, but also share other information that is important for the tasks with which they are involved. In response to this growing trend, the MediaSense framework addresses the intelligent delivery of any information to any host, anywhere, based on context-aware information regarding personal preferences, presence information, and sensor values. The focus of this paper is the overall framework, the handling of user profiles, management of context information, real-time distribution and proof of concepts. © 2010 IEEE.

  • 11.
    Walters, Jamie
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Ripples Across The Internet of Things: Context Metrics as Vehicles forRelational Self-Organization2011Licentiate thesis, monograph (Other academic)
    Abstract [en]

    The current paradigm shift in computing has placed mobile computation at the centre of focus. Users are now even more connected; demanding everything everywhere services. These services, such as social networking and media, benefit from the availability of context information seamlessly gathered and shared; providing customized and user-centric experiences. The distribution of context information no longer conforms to the paradigms of the existing Internet with regards to heterogeneity, connectivity and availability. This mandates new approaches towards its organization and provisioning in support of dependent applications and services.

    In response to these developments, the work summarized in this thesis addresses the fundamental problem of presenting context information in organized models as relevant subsets of global information. In approaching this problem, I introduced a distributed collection of context objects that can be arranged into simple relevant subsets called context schemata and presented to applications and services in supporting the realization of context based user experiences. Acknowledging the dynamic behaviour inherent of the real world interactions, I introduced an algorithm for measuring the proximities and similarities among these context objects, providing a metric through which to achieve organization. Additionally, I provided a means of ranking heterogeneous and distributed sensors in response to real time interaction between users and their digital ecosystem. Ranking provides an additional metric with which to achieve organization or identifying important and reputable information sources. The work I present here, additionally details my approach to realizing this complete behaviour an a distributed overlay, exploiting its properties for distribution, persistence and messaging. The overlay is also utilized for the provisioning of the supporting context information.

    Improvements in the ability to discover and attach new context information sources is fundamental to the ability to continually maintain expressions of context, derived from heterogeneous and disparate sources. By being able to create relevant subsets of organized data related to the requirements of applications and services in an end-point, infrastructures are realized for connecting and supporting the increasingly large numbers of users and their sources of information. Coupled with the distribution, these infrastructures realize improvements with regards to the effort required to achieve the same results. The culmination of the work presented in this thesis is an effort to enable seamless context-centric solutions on a future Internet of Things and thus constituting an adequate solution to the challenges raised above.

  • 12.
    Walters, Jamie
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Evolving Presentity-Based Context Schemas by Estimating Context Proximity2012In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, Springer, 2012, p. 137-152Conference paper (Refereed)
    Abstract [en]

    The definition of what constitutes context proximity has remained largely unexplored but accepted as being a fundamental issue towards realising an architecture of connected things. Existing solutions aimed at enabling context awareness are often undermined by their dependencies on centralized architectures limited with respect to their scalability. Our previous work proposed the use of the so called Context Schema; an encapsulated representation of the information points constituting the context of a presentity. Building such a schema requires support for determining set members limited by some metric; a proximity metric. In this paper, we propose an algorithm for estimating the context proximity among presentities, enabling complete schemata of entities relevant to, and expressing the current context of a presentity. Secondly we propose an extension of a gossiping algorithm to optimize the ability create schemata as one traverses a vast and dynamic connected things infrastructure. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

  • 13.
    Walters, Jamie
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Norling, Roger
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Distributed Context Models in Support of Ubiquitous Mobile Awareness Services2011In: 2nd International ICST Conference on Sensor Systems and Software, S-Cube; Miami, FL; 13 December 2010 through 15 December 2010; Code 87376, Springer, 2011, p. 121-134Conference paper (Refereed)
    Abstract [en]

    Real-time context aware applications require dynamic support reflecting the continual changes in context. Architectures that distribute and utilize the supporting sensor information within the constraints of publish-subscribe systems provide sensor information in primitive forms requiring extensive application-level transformations limiting the dynamic addition and removal of sources. Elevating sensors to first class objects in a meta-model addresses these issues by applying ontological dimensions in direct support of context. This paper proposes an extension of such a model into a distributed architecture co-located with context user agents. This arrangement provides clients with a model schema which is continually evolving over sensor domains. In addition, the evolving model schema represents an accurate temporal view of a userâǍŹs context with respect to the available sensors and actuators.

  • 14.
    Walters, Jamie
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Kanter, Theo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Savioli, Enrico
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    A Distributed Framework for Organizing an Internet of Things2012In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, Springer, 2012, p. 231-247Conference paper (Refereed)
    Abstract [en]

    Applications on a future Internet of Things require the provisioning of current, relevant and accurate context information to end-points. Context information existing globally require organization into object-oriented models available locally in APIs as current, relevant and accurate views. Moreover, such applications require support for the highly dynamic interactions influencing continual changes in global context information. Existing approaches, such as the web services, are unable to provide this support partly due to the presupposed existence of a network service brokering context information, relying on DNS; or adopting a presence model for context which does not adequately scale. To this end, we propose a distributedframework for the interconnection of end-points and co-located agent entities, whereby agents are provided with local views of a relevant subset of global context information. We show how to achieve relevant local current views of global context information via ranking in an object-oriented context model. The distributed approach realizes the provisioning of context information in real-time, i.e., with predictable time bounds. Finally, we demonstrate the feasibility of the approach in a prototype based on P-Grid. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

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