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  • 1. Drugge, Mikael
    et al.
    Nilsson, Marcus
    Luleå tekniska universitet.
    Kristiansson, Johan
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Experiences from mobile e-meetings with the borderland wearable computer2003Rapport (Annet vitenskapelig)
    Abstract [en]

    People are presented with an increasing number of opportunities to communicate regardless of location as wireless network connectivity becomes more prevalent. Questions that arise are in what form this communication is and what challenges it poses? Can the experience of group communication be enhanced so that a feeling of actual presence can be conveyed? Can we enable participants to experience the world from another person's perspective? We believe so, in this paper we discuss our experiences of group communication when using a wearable computer that is always connected to the network.

  • 2. Drugge, Mikael
    et al.
    Nilsson, Marcus
    Luleå tekniska universitet.
    Kristiansson, Johan
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Experiences of conveying knowledge in borderland2003Rapport (Annet vitenskapelig)
    Abstract [en]

    One of humankind's most basic needs is that of being able to communicate with other people. As wireless network connectivity becomes more prevalent, factors such as physical location and situation diminish in significance for deciding when and how such communication can take place. What happens when a user is given this freedom to utilize the network regardless of time and place? Questions that arise are how different media can enrich communication and what challenges it poses. Can we enable other users to experience the world from another person's perspective? Can we expand it beyond pure communication and allow other more novel uses to emerge? Can we use this as a way of conveying knowledge in real-time to those in need of it? We believe so, in this paper we discuss our experiences of mobile communication when using a wearable computer that is always connected to the best network available.

  • 3.
    Jimenez, Lara Lorna
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Simon, Miguel Gomez
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Schelén, Olov
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Kristiansson, Johan
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Synnes, Kåre
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    CoMA: Resource Monitoring of Docker Containers2015Inngår i: Proceedings of the 5th International Conference on Cloud Computing and Services Science (CLOSER 2015), SCITEPRESS Digital Library , 2015, Vol. 1, s. 145-154Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This research paper presents CoMA, a Container Monitoring Agent, that oversees resource consumption of operating system level virtualization platforms, primarily targeting container-based platforms such as Docker. The core contribution is CoMA, together with a quantitative evaluation verifying the validity of the measurements reported by the agent for three metrics: CPU, memory and block I/O. The proof-of-concept is implemented for Docker-based systems and consists of CoMA, the Ganglia Monitoring System and the Host sFlow agent. This research is in line with the rising trend of container adoption which is due to the resource efficiency and ease of deployment. These characteristics have set containers in a position to topple virtual machines as the reigning virtualization technology in data centers.

  • 4.
    Kristiansson, Johan
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Creating always-best-connected multimedia applications for the 4:th generation wireless systems2004Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis describes an application-layer framework for managing network connectivity in the 4th-generation wireless systems, which will consist of overlapping heterogeneous networks. If multiple access networks are present, users will have a choice to access the Internet through the “best” available network. The main problem today is that different wireless networks are not particularly integrated and users are in most cases forced to manually interact with the system when switching between networks. The work presented in this thesis addresses this challenge and describes a framework for managing IP mobility while considering competing connection speeds and pricing models. By using an application-layer mobility scheme, called the Resilient Mobile Socket (RMS), the thesis shows how applications can manage handovers and seamlessly migrate data streams between different networks. Moreover, by using a method called Competition based Soft Handovers (CSHM), the thesis demonstrates how handovers can be automatically triggered to the network currently offering the least packet losses and end-to-end delay. Finally, the thesis proposes bandwidth broker to manage network connectivity and share bandwidth effectively between multiple media within an application. As a proof of concept several prototypes have been built into the commercial e-meeting application Marratech Pro. The thesis presents real-life results from exploratory experiments using these prototypes.

  • 5.
    Kristiansson, Johan
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    On technologies for ubiquitous multimedia communication2006Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The proliferation of multimedia and deployment of wireless networks over the last decade have made it possible for users to communicate and share information using e-meeting services from almost any location at anytime. While these new services offer new ways to communicate, they are not always easy to use because of the heterogeneity of networks and devices, which must be managed by the users to take full advantage of the possible benefits. Switching to another communication service running on another terminal requires even more configuration efforts. In addition, it is expected that the configuration efforts required by the users will become more time-consuming in the future as the need for richer communication grows and the diversity of services and networks increases. This doctoral thesis proposes and evaluates new methods to create a ubiquitous multimedia communication system, which makes it easier for users to participate in online e-meetings using the most suitable network or terminal. The thesis makes several contributions related to mobility and bandwidth management. One contribution is a new mobility protocol called the Resilient Mobile Socket and an algorithm called Competition-based Soft-Handovers Management designed to manage host mobility and seamlessly migrate media streams between different network connections. To deal with bandwidth variation, the thesis proposes a method based on microeconomic theory to adapt and share bandwidth efficiently between media within an application, thereby relieving the users from manually adjusting bandwidth utilization after switching network. In regards to switching terminals, the thesis proposes a concept called media resources, and a framework for managing media resources using context-awareness. The most beneficial media resource is automatically selected using an algorithm, which is also presented in the thesis. The proposed methods, frameworks, and algorithms have been evaluated through a combination of theoretical analysis, controlled laboratory experiments, user studies, and exploratory experiments using prototypes. The results from these investigations show that it is possible to create a ubiquitous multimedia communication system that enables richer communication in mobile settings by better utilizing available networks and combining multiple terminals. A final conclusion is that it is crucial to minimize configuration efforts, but the user should always have the final decision if a configuration procedure cannot be automated with complete accuracy.

  • 6. Kristiansson, Johan
    et al.
    Hallberg, Josef
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Svensson, Sara
    Luleå tekniska universitet.
    Synnes, Kåre
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Parnes, Peter
    Supporting automatic media resource selection using context-awareness2005Inngår i: The Third International Conference on Advances in Mobile Multimedia: (MoMM2005), September 19-21, 2005, Kuala Lumpur, Malaysia / [ed] G. Kotsis, Die Österreichische Computer Gesellschaft, 2005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In a world of ubiquitous media resources, such as cameras, displays, microphones, provided by a wide variety of multimedia systems, there is a need for automatic resource selection which seamlessly utilizes the best available communication tool from a user perspective. This paper therefore presents an algorithm which uses context-awareness to support automatic media resource selection. The algorithm takes advantage of an abstract classification of privacy, quality, and cost in order to compare media resources to user’s preferences. As a proof of concept implementation, the algorithm has been incorporated into an e-meeting application called Marratech.

  • 7. Kristiansson, Johan
    et al.
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    An application-layer approach to seamless mobile multimedia communication2006Inngår i: IEEE Transactions on Network and Service Management, ISSN 1932-4537, E-ISSN 1932-4537, Vol. 3, nr 1, s. 33-42Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Providing seamless IP mobility support is one of the most challenging problems towards a world of mobile and ubiquitous multimedia communication. This paper proposes an application-layer framework based on the Session Initiation Protocol and the Resilient Mobile Socket to provide mobility support for distributed multimedia applications. As a part of the framework the paper describes a new handover strategy called Competition-based Soft-Handover Management that uses simulcast to improve quality of service and to seamlessly hand over multimedia traffic to the network interface that currently offers better network characteristics. In short, during a handover packets are simulcasted through all available network interfaces, and when the packets are received by the remote end-point, they are merged back into one stream. As each network connection competes with other connections in contributing to the merged stream at the remote end-point, the handover process can be viewed as a competition where the connection that contributes most is selected after the handover. As a proof of concept, the framework has been integrated into Marratech, which is a commercially available audio/video group communication application. By using network emulators, the paper demonstrates how the framework can be used to improve QoS, compare end-to-end performance, and perform lossless handovers while reducing redundant packets.

  • 8. Kristiansson, Johan
    et al.
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Application-layer mobility support for streaming real-time media2004Inngår i: Broadband wireless - the time is now: 2004 IEEE Wireless Communications and Networking Conference, WCNC 2004 ; 21 - 25 March 2004, Atlanta, GA, USA, Piscataway, NJ: IEEE Communications Society, 2004, Vol. 1, s. 268-273Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents an UDP-based socket extension called the resilient mobile socket (RMS), which provides application-layer mobility support by encapsulating other sockets into a new aggregated socket abstraction. Encapsulated sockets can then be added or removed without disturbing running applications. RMS also provides a method for soft handovers where several encapsulated sockets are used simultaneously during a handover. As a proof of concept, a working prototype has been built by integrating RMS with Marratech Pro, a commercially available e-meeting application. This prototype has been used to evaluate RMS and to investigate how GSM audio quality is affected by handovers. The result from the investigation shows that soft handovers can be executed without loosing packets or causing extra latency, while a hard handover in average took around 200 ms to complete. This indicates that proactive handovers and redundancy are important, but that more work must he done to predict disconnections.

  • 9. Kristiansson, Johan
    et al.
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Mobility support for collaborative real-time applications2003Rapport (Annet vitenskapelig)
    Abstract [en]

    Today we are approaching a truly connected and wireless world where users can be always connected by switching between different carriers and providers. This paper presents an architecture which enables mobile media applications to operate across a wide range of wireless networks, gracefully handle network failures and share environmental information, such as packet loss-rate or available bandwidth with remote peers. The architecture is evaluated using a commercially available E-meeting application, Marratech Pro by seamlessly switching between three carriers; LAN, WLAN and GRPS.

  • 10. Kristiansson, Johan
    et al.
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Providing seamless mobility with competition based soft handover management2004Inngår i: Management of Multimedia Networks and Services: 7th IFIP/IEEE International Conference, MMNS 2004, San Diego, CA, USA, October 3-6, 2004. Proceedings / [ed] John Vicente; David Hutchison, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2004, s. 295-307Konferansepaper (Fagfellevurdert)
    Abstract [en]

    As host mobility and radio interference in wireless networks cause packet losses and delays, it is difficult to develop useful mobile real-time media applications. This paper describes a new handover strategy for end-to-end mobility called Competition based Soft Handover Management (CSHM). During a handover, redundant packet streams are sent through multiple connections which are later merged into one stream when received by the other end-point. As each network connection competes with other connections in contributing to the merged packet stream, the handover process can be viewed as a competition. As a proof of concept, CSHM has been implemented in Resilient Mobile Socket, RMS, an application-layer mobility scheme and used together with Marratech Pro, which is a commercially available e-meeting application. By using this prototype, the paper shows that it is possible to minimize redundant packets as well as decrease packet losses during handovers.

  • 11. Kristiansson, Johan
    et al.
    Scholl, Jeremiah
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Bridging the gap between multimedia application and heterogeneous networks using a market-based middleware2005Inngår i: Proceedings: Sixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks, WoWMoM 2005 : Taormina - Giardini Naxos, Italy, 13 - 16 June 2005 / [ed] Giuseppe Anastasi, Los Alamitos, Calif: IEEE Computer Society Press , 2005, s. 463-465Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper¹ presents a middleware that applies a micro-economic model to help multimedia applications utilize available bandwidth in a way that maximizes the user’s net benefit. The key components are a bandwidth broker that puts the supply of available bandwidth on a virtual market, and utility functions for each media, which are used to calculate the relative gain they can offer the user by using this bandwidth. Basic supply and demand principles are used where the broker raises the price if the total demand from all media exceeds the available supply, or lowers the price if the demand is lower than the available supply.

  • 12. Kristiansson, Johan
    et al.
    Scholl, Jeremiah
    Parnes, Peter
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Managing bandwidth in multimedia applications using a market-based middleware2005Inngår i: Management of Multimedia Networks and Services: 8th International Conference on Management of Multimedia Networks and Services, MMNS 2005, Barcelona, Spain, October 24-26, 2005. Proceedings / [ed] Jordi Dalmau Royo, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2005, s. 216-227Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents an application-layer middleware that applies a microeconomic model to help multimedia applications utilize available bandwidth in a way that maximizes the user’s net benefit. The key components are a bandwidth broker that puts the supply of available bandwidth on a virtual market residing inside the application, and utility functions for each media, which are used to calculate their relative gain to the user at each bandwidth level. Basic supply and demand principles are used where the broker raises a virtual price if the total demand from all media exceeds the available supply, or lowers the price if demand is lower than the available supply. The advantage of the middleware is that it allows problems related to network management (usually affecting the supply) and human computer interaction (usually affecting demand) to be researched and integrated separately into an application and combined to leverage bandwidth in the best possible way. As a proof of concept, a prototype has been built by integrating the middleware into Marratech Pro, a commercially available e-meeting application. The paper presents experimental results using this prototype

  • 13.
    Rana, Juwel
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Kristiansson, Johan
    Hallberg, Josef
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Synnes, Kåre
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    An architecture for mobile social networking applications2009Inngår i: 2009 First International Conference on Computational Intelligence, Modelling and Simulation, (CSSim 2009): Brno, Czech Republic, 7 - 9 September 2009 / [ed] Jiri Kunovský, Piscataway, NJ: IEEE Communications Society, 2009, s. 241-246Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Mobile semantic Web provides a new way of developing context-aware social networking applications. Social networking applications are changing the way of communication by using userpsilas context-information. For example, micro-blogging has become a smart way of conveying the current situation and activity by using user context. There is currently a significant difference between using social networking applications on a static computer compared to a mobile device, even if current mobile devices are powerful and have good connectivity. The difference is primarily related to the mobility aspect since the user contexts may change more frequently and the user may not be able to interact with the mobile device. In this paper we identify common characteristics of current social networking applications and how they attract users. Finally, we propose an agent-based system architecture that is based on a distributed platform for developing semantic and semi-automated mobile social networking applications.

  • 14.
    Rana, Juwel
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Kristiansson, Johan
    Hallberg, Josef
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Synnes, Kåre
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Challenges for mobile social networking applications2009Inngår i: Communications Infrastructure. Systems and Applications in Europe: first international ICST conference, EuropeComm 2009, London, UK, August 11-13, 2009 : revised selected papers / [ed] Rashid Mehmood, Berlin: Springer Science+Business Media B.V., 2009, s. 275-285Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents work in progress regarding utilization of social network information for mobile applications. Primarily a number of challenges are identified, such as how to mine data from multiple social networks, how to integrate and consolidate social networks, and how to manage semantic information for mobile applications. The challenges are discussed from a semantic Web perspective using a driving scenario as motivation.The main objective is to enable mobile applications to benefit from semantic information obtained from Web services, mobile devices, or the surrounding environment. The goal is therefore to create a framework that enables integration of semantic information (location, activity, interests, etc) with social network data (from Twitter, FaceBook, LinkedIn, etc) to facilitate intelligent yet easy to use communication tools for individual persons as well as groups of persons. An ultimate goal is to make complex communication simple through utilization of semantic information and social network data for pervasive services in mobile devices.

  • 15.
    Rana, Juwel
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Kristiansson, Johan
    Synnes, Kåre
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Supporting ubiquitous interaction in dynamic shared spaces through automatic group formation based on social context2012Inngår i: ASE International Conference on Social Informatics, Washington D.C., USA: December 14-16, 2012, Piscataway, NJ: IEEE Computer Society Press , 2012, s. 121-130Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper investigates how the management of groups that communicate electronically, such as group formation, can be simplified based on users’ context and social relations. This work builds on a framework for Aggregated Social Graphs, where each node represents the relational strength to other users. The strength of a relation is calculated by utilizing information on how we communicate using mobile phone calls, emails, and social networks in combination with additional sources of information such as from calendars. A contextual group management schema is presented where contextual parameters such as tags, locations and objects are used to prune an aggregated social graph in order to automatically form a group.The schema is implemented in a runtime environment based on the Distributed Shared Memory service available at Ericsson Labs. The feasibility of the proposed schema is then studied through a prototype implementation both in a web-browser and as a mobile app. The study shows that a group can be formed automatically and that a lightweight communication session then can be initiated for that group.

  • 16. Rana, Juwel
    et al.
    Kristiansson, Johan
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Synnes, Kåre
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    The strength of social strength: an evaluation study of algorithmic versus user-defined ranking2014Inngår i: Proceedings of the ACM Symposium on Applied Computing, New York: ACM Digital Library, 2014, s. 658-659Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A family relation is generally considered to be stronger than a relation between coworkers in our society, but the strength of the relation is intrinsic and have been cumbersome to measure. The fact that we increasingly communicate electronically, such as through email, mobile phone calls or social media, has made it possible to automatically measure and analyze the relation between persons. This paper presents an evaluation study of social strength, where the social strength is defined as a metric that represents the tie strength of the relation between persons, calculated based on the frequency, duration, context and media type of the electronic communication between the persons. The study found that the Utility Function performs better because it emphasize the communication frequency between persons. There is however a significant difference in results between the algorithms and the user-defined ranking. This indicates the inability of the algorithms to capture intrinsic knowledge (such as the importance of family bonds and nonelectronic interaction). This would mean that the participants' ranking was colored by their interaction in real-life. It is however evident from the study that the functions provide more accurate results when they utilize multiple sources of communication history over only a single source. Finally, capturing sufficient communication data from multiple data sources is very hard, as access to such data is restricted because of concerns regarding for instance business and privacy. A conclusion is that the algorithms requires a larger data set, preferably being captured continuously over a period longer than 2 weeks, to achieve a better accuracy that is closer to the ground truth. However, the study shows the feasibility of capturing social strength automatically and we believe that the results is an important step towards systems that reason about the relation between persons in order to make communications services more pervasive.

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