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Walters, Jamie
Publications (10 of 14) Show all publications
Walters, J., Kanter, T. & Savioli, E. (2012). A Distributed Framework for Organizing an Internet of Things. In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering: . Paper presented at 3rd International ICST Conference on Mobile Lightweight Wireless Systems, MOBILIGHT 2011;Bilbao;9 May 2011through10 May 2011;Code90406 (pp. 231-247). Springer
Open this publication in new window or tab >>A Distributed Framework for Organizing an Internet of Things
2012 (English)In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, Springer, 2012, p. 231-247Conference paper, Published 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.

Place, publisher, year, edition, pages
Springer, 2012
Keywords
context distance; context metrics; context proximity; dcxp; mediasense; p-grid; sensor ranking
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-13723 (URN)10.1007/978-3-642-29479-2_18 (DOI)2-s2.0-84869594793 (Scopus ID)STC (Local ID)978-364229478-5 (ISBN)STC (Archive number)STC (OAI)
Conference
3rd International ICST Conference on Mobile Lightweight Wireless Systems, MOBILIGHT 2011;Bilbao;9 May 2011through10 May 2011;Code90406
Available from: 2011-04-29 Created: 2011-04-29 Last updated: 2016-10-19Bibliographically approved
Walters, J. & Kanter, T. (2012). Evolving Presentity-Based Context Schemas by Estimating Context Proximity. In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering: . Paper presented at 3rd International ICST Conference on IT Revolutions, 2011;Cordoba;23 March 2011through25 March 2011;Code92419 (pp. 137-152). Springer
Open this publication in new window or tab >>Evolving Presentity-Based Context Schemas by Estimating Context Proximity
2012 (English)In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, Springer, 2012, p. 137-152Conference paper, Published 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.

Place, publisher, year, edition, pages
Springer, 2012
Keywords
Context; Context Awareness; Context Proximity; Presentity; Real Time; Self-Organization
National Category
Communication Systems
Identifiers
urn:nbn:se:miun:diva-13266 (URN)10.1007/978-3-642-32304-1_13 (DOI)2-s2.0-84869598460 (Scopus ID)STC (Local ID)978-364232303-4 (ISBN)STC (Archive number)STC (OAI)
Conference
3rd International ICST Conference on IT Revolutions, 2011;Cordoba;23 March 2011through25 March 2011;Code92419
Available from: 2011-02-16 Created: 2011-02-16 Last updated: 2016-10-19Bibliographically approved
Kanter, T., Forsström, S., Kardeby, V., Walters, J., Jennehag, U. & Österberg, P. (2012). MediaSense – an Internet of Things Platform for Scalable and Decentralized Context Sharing and Control. In: : . Paper presented at ICDT2012.
Open this publication in new window or tab >>MediaSense – an Internet of Things Platform for Scalable and Decentralized Context Sharing and Control
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2012 (English)Conference paper, Published 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.

Keywords
Internet of Things, Context awareness, Sensors, Actuators, Open source
National Category
Communication Systems
Identifiers
urn:nbn:se:miun:diva-16620 (URN)STC (Local ID)STC (Archive number)STC (OAI)
Conference
ICDT2012
Projects
InSIKTKITT
Available from: 2012-07-03 Created: 2012-07-03 Last updated: 2016-10-20Bibliographically approved
Walters, J., Kanter, T. & Norling, R. (2011). Distributed Context Models in Support of Ubiquitous Mobile Awareness Services. In: 2nd International ICST Conference on Sensor Systems and Software, S-Cube; Miami, FL; 13 December 2010 through 15 December 2010; Code 87376: . Paper presented at 2nd International ICST Conference on Sensor Systems and Software, S-Cube; Miami, FL; 13 December 2010 through 15 December 2010; Code 87376 (pp. 121-134). Springer
Open this publication in new window or tab >>Distributed Context Models in Support of Ubiquitous Mobile Awareness Services
2011 (English)In: 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, Published 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.

Place, publisher, year, edition, pages
Springer, 2011
Series
Lecture Notes in Computer Science, ISSN 0302-9743 ; 57
Keywords
Context Agents; Context Awareness; Object-Oriented; Peer-to-Peer
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:miun:diva-12283 (URN)10.1007/978-3-642-23583-2_9 (DOI)2-s2.0-84869597392 (Scopus ID)STC (Local ID)978-364223582-5 (ISBN)STC (Archive number)STC (OAI)
Conference
2nd International ICST Conference on Sensor Systems and Software, S-Cube; Miami, FL; 13 December 2010 through 15 December 2010; Code 87376
Available from: 2010-11-24 Created: 2010-11-24 Last updated: 2018-01-12Bibliographically approved
Walters, J. (2011). Ripples Across The Internet of Things: Context Metrics as Vehicles forRelational Self-Organization. (Licentiate dissertation). Sundsvall: Mittuniversitetet
Open this publication in new window or tab >>Ripples Across The Internet of Things: Context Metrics as Vehicles forRelational Self-Organization
2011 (English)Licentiate 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.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2011
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 59
Keywords
context information, context distances, context modelling, dcxp, cii
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-14426 (URN)STC (Local ID)978-91-86694-37-1 (ISBN)STC (Archive number)STC (OAI)
Presentation
2011-04-26, L111, Mittuniversitetet, Sundsvall, 11:22 (English)
Opponent
Supervisors
Available from: 2011-09-01 Created: 2011-08-31 Last updated: 2018-01-12Bibliographically approved
Kardeby, V., Forsström, S., Walters, J., Österberg, P. & Kanter, T. (2011). The MediaSense Framework: Ranking Sensors in a Distributed Architecture. In: : . Paper presented at 2010 Fifth International Conference on Digital Telecommunications, The Updated MediaSense Framework, Athens, Greece, June 13- June 19 (pp. 48-51). IEEE conference proceedings
Open this publication in new window or tab >>The MediaSense Framework: Ranking Sensors in a Distributed Architecture
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2011 (English)Conference paper, Published 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.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
Keywords
Ubiquity, Mobility, Context Information, User Profiles
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-13265 (URN)STC (Local ID)978-0-7695-4071-9 (ISBN)STC (Archive number)STC (OAI)
Conference
2010 Fifth International Conference on Digital Telecommunications, The Updated MediaSense Framework, Athens, Greece, June 13- June 19
Available from: 2011-02-16 Created: 2011-02-16 Last updated: 2016-10-19Bibliographically approved
Dobslaw, F., Larsson, A., Kanter, T. & Walters, J. (2010). An Object-Oriented Model in Support of Context-Aware Mobile Applications. In: : . Paper presented at Mobilware 2010. Springer
Open this publication in new window or tab >>An Object-Oriented Model in Support of Context-Aware Mobile Applications
2010 (English)Conference paper, Published 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.

Place, publisher, year, edition, pages
Springer, 2010
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-10027 (URN)2-s2.0-84869594147 (Scopus ID)
Conference
Mobilware 2010
Projects
STC
Available from: 2010-08-02 Created: 2009-10-14 Last updated: 2018-01-12Bibliographically approved
Forsström, S., Kardeby, V., Walters, J., Norling, R. & Kanter, T. (2010). Dissemination of Anonymised Context Information by Extending the DCXP Framework. In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering Volume 32: . Paper presented at First International ICST Conference on Mobile Networks And Management (pp. 57-66). Springer
Open this publication in new window or tab >>Dissemination of Anonymised Context Information by Extending the DCXP Framework
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2010 (English)In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering Volume 32, Springer, 2010, p. 57-66Conference paper, Published 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.

Place, publisher, year, edition, pages
Springer, 2010
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-9948 (URN)000303422100006 ()2-s2.0-84885884773 (Scopus ID)
Conference
First International ICST Conference on Mobile Networks And Management
Available from: 2009-09-30 Created: 2009-09-30 Last updated: 2016-09-22Bibliographically approved
Forsström, S., Kardeby, V., Walters, J. & Kanter, T. (2010). Location-Based Ubiquitous Context Exchange in Mobile Environments. In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering Vol 68: . Paper presented at Monami 2010 (pp. 177-187). Springer
Open this publication in new window or tab >>Location-Based Ubiquitous Context Exchange in Mobile Environments
2010 (English)In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering Vol 68, Springer, 2010, p. 177-187Conference paper, Published 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.

Place, publisher, year, edition, pages
Springer, 2010
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-12280 (URN)000307366900016 ()2-s2.0-84870673461 (Scopus ID)
Conference
Monami 2010
Available from: 2010-11-24 Created: 2010-11-24 Last updated: 2018-01-12Bibliographically approved
Kanter, T., Kardeby, V., Forsström, S. & Walters, J. (2010). Scenarios, Research Issues, and Architecture for Ubiquitous Sensing. In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering  Vol 68: . Paper presented at 2nd International ICST Conference on Mobile Networks and Management, MONAMI 2010; Santander; Spain; 22 September 2010 through 24 September 2010 (pp. 285-297). Springer
Open this publication in new window or tab >>Scenarios, Research Issues, and Architecture for Ubiquitous Sensing
2010 (English)In: Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering  Vol 68, Springer, 2010, p. 285-297Conference paper, Published 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.

Place, publisher, year, edition, pages
Springer, 2010
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-12282 (URN)10.1007/978-3-642-21444-8_25 (DOI)000307366900025 ()2-s2.0-84885889581 (Scopus ID)978-364221443-1 (ISBN)
Conference
2nd International ICST Conference on Mobile Networks and Management, MONAMI 2010; Santander; Spain; 22 September 2010 through 24 September 2010
Available from: 2010-11-24 Created: 2010-11-24 Last updated: 2016-09-23Bibliographically approved
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