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  • 751.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    mSTAR: enabling collaborative applications on the Internet2000In: IEEE Internet Computing, ISSN 1089-7801, E-ISSN 1941-0131, Vol. 4, no 5, p. 32-39Article in journal (Refereed)
    Abstract [en]

    The mStar environment features an agent-based architecture, implemented in Java, which preserves compatibility with the dominant Mbone paradigm for IP multicast. In particular, mStar supports developers in creating distributed, real-time multimedia software applications such as e-meetings.

  • 752.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    A framework for management and control of distributed applications using agents and IP-multicast1999In: The future is now: proceedings / IEEE INFOCOM '99, the Conference on Computer Communications - Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies, 21 - 25 March 1999, Hotel Sheraton, New York, NY, USA, Piscataway, NJ: IEEE Communications Society, 1999, Vol. 3, p. 1445-1452Conference paper (Refereed)
    Abstract [en]

    As more and more applications on the Internet become network aware the need and possibility to remotely control them becomes larger. This paper presents a framework for control and management of distributed applications and components. This is done using IP-multicast and an agent based application architecture. The target of the framework is to allow for resource discovery of both controllable elements and available control points in the these elements as well as real-time control. All this is done in scalable and secure way based on IP-multicast and asymmetric cryptography. The presented framework is also independent of the underlying transport mechanism to allow for flexibility and easy deployment. The framework bandwidth usage and introduced control delay is presented. Details on the reference implementation of the framework and example usage scenarios where the framework is used to create bandwidth adaptive applications and better group awareness is also presented. Keywords - IP-multicast, distributed management, control, secure messaging, reliable multicast, distributed applications, intelligent agents, quality of service management, Java I.

  • 753.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    An IP-multicast based framework for designing synchronous distributed multi-user applications on the Internet1999Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis examines the problems of how to design scalable, robust, and distributed real-time media applications for the Internet. An agent based framework for solving this problem is presented. The framework promotes several important design requirements such as modularity and reusability of software modules, remote management of applications, adaptiveness, robustness, accessibility, symmetry and the most important scalability. The issue of scalability is examined on several levels including data-distribution, different end-user platforms, scalability of real-time media flows, bandwidth adaption and scalability of sessions. The design of the framework is based on the important concept of IP-multicast, which allows for scalable distribution of data on the Internet. How this decision has influenced the design of the framework is examined in the thesis. The design of the framework have been verified by building a reference implementation in Java and building a number of high-level end-user applications for real-time e-meetings, e-learning (net-based learning) and social awareness via the e-corridor.

  • 754.
    Acharya, Soam
    et al.
    Cornell University, Ithaca.
    Smith, Brian P
    Cornell University, Ithaca.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Characterizing user access to videos on the World Wide Web1999In: Multimedia computing and networking 2000 / [ed] Klara Nahrstedt, Bellingham, Wash: SPIE - International Society for Optical Engineering, 1999, p. 130-141Conference paper (Refereed)
    Abstract [en]

    Despite evidence of rising popularity of video on the web (or VOW), little is known about how users access video. However, such a characterization can greatly benefit the design of multimedia systems such as web video proxies and VOW servers. Hence, this paper presents an analysis of trace data obtained from an ongoing VOW experiment in Lulea University of Technology, Sweden. This experiment is unique as video material is distributed over a high bandwidth network allowing users to make access decisions without the network being a major factor. Our analysis revealed a number of interesting discoveries regarding user VOW access. For example, accesses display high temporal locality: several requests for the same video title often occur within a short time span. Accesses also exhibited spatial locality of reference whereby a small number of machines accounted for a large number of overall requests. Another finding was a browsing pattern where users preview the initial portion of a video to find out if they are interested. If they like it, they continue watching, otherwise they halt it. This pattern suggests that caching the first several minutes of video data should prove effective. Lastly, the analysis shows that, contrary to previous studies, ranking of video titles by popularity did not fit a Zipfian distribution.

  • 755.
    Parviainen, Roland
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Multicast Interactive Radio1999In: Proceedings of the First International Conference on the Practical Application of Java: 21st - 23rd April 1999, Commonwealth Conference and Events Centre, London, UK / [ed] Dennis Merritt, London: Practical Applications Co. , 1999, p. 137-153Conference paper (Refereed)
    Abstract [en]

    This document describes multicast Interactive Radio, a system for distributing high-quality audio over the Internet with interactivity. The system is implemented in the platform-independent language Java, and uses IP multicast for distributing the audio

  • 756.
    Synnes, Kåre
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Net-based Learning and the mStar Environment1999Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This licentiate thesis focuses on how to design a robust and flexible environment for net-based learning. The environment is required to be scalable for large groups, robust over lossy networks, flexible to meet different learning scenarios, and support interactivity. The mStar environment presented in this thesis has been developed to meet these requirements. The environment is scalable through the use of IP multicast and a server-less design. Robustness is achieved by separating traffic by loss tolerance, where traffic that accept no loss uses a reliable multicast protocol and traffic that can accept some loss uses repair techniques. To enhance robustness even further, network resource management is suggested. Everything from small group meetings to large lectures is supported, which together with the possibility to use the tools asynchronously gives the flexibility needed. The tools in the environment are fully symmetric, which allows everyone equal access and thus supports full interactivity. Students using the mStar environment is no longer bound by physical distance, since they can easily take part of lectures, seminars and group discussions electronically. They can also be connected via not multicast enabled low bandwidth networks, since they can tunnel concentrated traffic to thir local hosts. The students are also less bound by time, as they can use the mMOD system to access recorded sessions or the WWW to access course information.

  • 757.
    Synnes, Kåre
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Parnes, Peter
    Widen, Johnny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    LTU.
    Net-based Learning for the Next Millenium1999In: Net-based Learning for the Next Millenium, Luleå: Luleå tekniska universitet, 1999Chapter in book (Other academic)
    Abstract [en]

    Luleå University of Technology has for the last few years deployed a net-based learning environment, mStar, to distribute courses to students independent of time and geographic distance. The mStar enviroment gives remotely attending students equal possibilities as traditionally attending students to take an active part of a course, as well as enhancing the learning experience for all students. This is made possible through a novel combination of IP-multicast technology and the WWW. This paper reports on experiences gained over a few years of practice and depicts a vision of the next generation of the mStar environment.

  • 758.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    Real-time control and management of distributed applications using IP-multicast1999In: Integrated network management VI: distributed management for the networked millenium ; proceedings of the Sixth IFIP/IEEE International Symposium on Integrated Network Management, Boston, MA, U.S.A., 24 - 28 May 1999 / [ed] Morris Sloman; Subrata Mazumdar; Emil Lupu, Piscataway, NJ: IEEE Communications Society, 1999, p. 901-914Conference paper (Refereed)
    Abstract [en]

    A central issue within any distributed computer environment is how to control and manage running applications. This paper presents an implementation of a framework for control and management of distributed applications and components using IP-multicast. The framework allows for easy and scalable control of single applications, groups of applications or parts of applications using a new agent-based architecture. Messaging is done using the control bus and the scalable reliable real-time transfer protocol for reliable distribution of data. The paper presents how this framework is integrated into Java-based applications and how developers specify access points. The paper also presents an application called multicast Manager, mManager, a Java implementation that provides a user interface to the framework. The mManager allows administrators to get an overview of currently running applications and if necessary control these applications. The paper presents example usage scenarios where the framework is used to create bandwidth-adaptive applications and better group awareness

  • 759.
    Synnes, Kåre
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Parnes, Peter
    Schefström, Dick
    Luleå tekniska universitet.
    Robust audio transport using mAudio1999Report (Other academic)
    Abstract [en]

    This report gives an overview of how to achieve robust transport of real-time audio streams over lossy Internet connections. Due to congestion and jitter, packet delay and loss are incurred on these audio streams, resulting in distortion. The losses can be repaired using receiver-only, sender-initiated or receiver-initiated techniques. Depending on the actual network condition, an optimal technique can be selected using adaptive behavior in the applications. Studies have shown that losses up to 20% can be effectively repaired using fairly simple techniques. The report also gives initial results from subjectively evaluating audio quality and presents an research prototype called mAudio that has been used to experiment with many of the loss recovery techniques mentioned in this report.

  • 760.
    Synnes, Kåre
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Parnes, Peter
    Widen, Johnny
    Schefström, Dick
    LTU.
    Student 2000: net-based learning for the next millenium1999In: WebNet 99: World Conference on the WWW and Internet ; [Honolulu, Hawaii, October 24 - 20, 1999] ; contains electronic versions of papers presented at WebNet Conferences 1996 - 1999 / [ed] Paul De Bra, Charlottesville, Va: Association for the Advancement of Computing in Education, 1999, p. 1031-1036Conference paper (Refereed)
    Abstract [en]

    Luleå University of Technology has for the last few years deployed a net-based learning environment, mStar, to distribute courses to students independent of time and geographic distance. The mStar enviroment gives remotely attending students equal possibilities as traditionally attending students to take an active part of a course, as well as enhancing the learning experience for all students. This is made possible through a novel combination of IP-multicast technology and the WWW. This paper reports on experiences gained over a few years of practice and depicts a vision of the next generation of the mStar environment.

  • 761.
    Wiss, Ulrika
    et al.
    Luleå tekniska universitet.
    Carr, David
    Luleå tekniska universitet.
    Synnes, Kåre
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    Luleå tekniska universitet.
    CRES: a Competitive Reactive Eco-System Agent Architecture1998Report (Other academic)
    Abstract [en]

    This paper presents CRES, a learning reactive agent architecture for managing limited resources. CRES achieves complicated behavior with simple components, minimizes the need for explicit instructions, and can handle learning without the need for complicated reasoning or the need for each agent to know the state of the entire system. CRES consists of two main components: the reactive agents and the environment. The agents learn by feeding on previous agent generations, and compete to create an emergent behavior. A TV-planner agent has been developed as a proof-of concept for the CRES architecture. It consists of a Java applet that interacts with a user, and a database that stores TV show data, user data, and agent data.

  • 762.
    Synnes, Kåre
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Lachapelle, Serge
    Luleå tekniska universitet.
    Parnes, Peter
    Distributed education using the mStar environment1998In: WebNet 1998: [Orlando, Florida, November 7 - 12, 1998] ; the 1998 edition contains electronic versions of papers presented at the conference / [ed] Hermann Maurer; Richard G. Olson, Charlottesville, Va: Association for the Advancement of Computing in Education, 1998Conference paper (Refereed)
  • 763.
    Synnes, Kåre
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Lachapelle, Serge
    Luleå tekniska universitet.
    Parnes, Peter
    Schefström, Dick
    Luleå tekniska universitet.
    Distributed education using the mStar environment1998In: Journal of universal computer science (Online), ISSN 0948-695X, E-ISSN 0948-6968, Vol. 4, no 10, p. 807-823Article in journal (Refereed)
    Abstract [en]

    The mStar environment for distributed education utilizes the WWW and IP-multicast to enable teacher-student collaboration over large geographic distances. Several educational projects, spanning from secondary school courses to company internal training, have deployed the mStar environment. This paper reports on experiences gained over a year of practice at the Lulea University of Technology and the Centre for Distance-spanning Technology. The paper presents the methodology and technology used, while recognizing usage scenarios such as preparation of presentation material, distributed presentations, asynchronous playback of recorded and edited material, and virtual meetings for educational support

  • 764.
    Schefström, Dick
    et al.
    LTU.
    Widen, Johnny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Parnes, Peter
    Synnes, Kåre
    Söderlund, Anders
    Luleå University of Technology, Department of Arts, Communication and Education, Education, Language, and Teaching.
    Education direct: entering the world beyond the web1998Conference paper (Refereed)
  • 765.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    Lightweight application level multicast tunnelling using mTunnel1998In: Computer Communications, ISSN 0140-3664, E-ISSN 1873-703X, Vol. 21, no 15, p. 1295-1301Article in journal (Refereed)
    Abstract [en]

    This paper presents a system, named mTunnel, for application level tunnelling of IP-multicast traffic in a lightweight manner, where the end-user is responsible for deciding which MBone-sessions and which IP-multicast groups to tunnel. mTunnel is primarily designed for easy deployment and easy-to-manage tunnelling. Information about currently tunnelled sessions and control of mTunnel is provided through a Web-interface. To save bandwidth, tunnelled streams can be transcoded on the media level and traffic sent through the tunnel can be compressed by grouping several packets together and using statistical compression. The overall bandwidth reduction achieved, without modifying the media itself, has been measured to be between 5% and 14%, depending on the traffic and media type.

  • 766.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Media Distribution in Heterogeneous Environments using IP-Multicast1998Report (Other academic)
    Abstract [en]

    This document discusses problems and solutions around distribution of media in heterogeneous environments when using IP-multicast.

  • 767.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    The History of the mStar Environment1998Report (Other academic)
    Abstract [en]

    This document presents the history and evolution of the mStar environment between 1995 and 1998. It starts with the Java Multi-User Environment and ends with Marratech company.

  • 768.
    Synnes, Kåre
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Lachapelle, Serge
    Luleå tekniska universitet.
    Parnes, Peter
    Schefström, Dick
    Luleå tekniska universitet.
    Distributed education using the mStar environment1997Report (Other academic)
    Abstract [en]

    The mStar environment for distributed education utilizes the WWW and IP-multicast to enable teacher-student collaboration over large geographic distances. Several educational projects, spanning from secondary school courses to company internal training, have deployed the mStar environment. This paper reports on experiences gained over a year of practice at the Luleå University of Technology and the Centre for distance-spanning Technology. The paper presents the methodology and technology used, while recognizing usage scenarios such as preparation of presentation material, distributed presentations, asynchronous playback of recorded and edited material, and virtual meetings for educational support.

  • 769.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Mattsson, Mattias
    Luleå tekniska universitet.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    mMOD: the multicast Media-on-Demand system1997Conference paper (Refereed)
    Abstract [en]

    This paper presents the multicast Media-onDemand system, mMOD, which is an on-demand system designed for recording and playback of not only audio and video but also other media that are being multicast on the Internet/MBone today. The system allows for users to request playback of recorded sessions containing MBone audio, video, whiteboard, NetTextEditor, mWeb (a distributed HTML presentation system) or any other UDP-multicast distributed session. It also allows for random access within these recordings. The system include a Web-interface for starting and controlling running sessions. To compensate for jitter and out-of-order packets, sessions distributed in RTP-format (RFC1889), can be reconstructed with new time-stamps.

  • 770.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    mTunnel: a multicast tunneling system with a user based quality-of-service model source1997In: PInteractive distributed multimedia systems and telecommunication services: 4th International Workshop, IDMS '97, Darmstadt, Germany, September 10-12, 1997 ; proceedings / [ed] Ralf Steinmetz, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 1997, p. 87-96Conference paper (Refereed)
    Abstract [en]

    This paper presents a system, called mTunnel, for application level tunneling of multicast traffic in a lightweight manner, where the end-user is responsible for deciding which MBone-sessions and multicast groups to tunnel. mTunnel is primarily designed for easy deployment and easy-to-manage tunneling. Therefore it runs as an user application and does not need access to restricted system resources. Information about currently tunneled sessions and control of mTunnel is provided through a Web-interface. To allow the user to easily start tunneling of announced MBone-sessions, mTunnel listens for announcements and presents this information through the Web-interface. To save bandwidth, tunneled streams can be translated in four ways: audio streams can be recoded to an encoding that requires lower bandwidth, several audio streams can be mixed together, streams can be switched based on activity in another stream and streams can be scaled by dropping a certain percent of the traffic.

  • 771.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Synnes, Kåre
    Schefström, Dick
    Luleå tekniska universitet.
    The CDT mStar environment: Distributed Collaborative Teamwork in Action1997In: Proceedings of the international ACM SIGGROUP conference on Supporting group work: the integration challenge GROUP '97, Piscataway, NJ: IEEE Communications Society, 1997, p. 167-176Conference paper (Refereed)
    Abstract [en]

    This paper presents the mStar environment, which creates an environment for truly scalable distributed teamwork It can be and is being used on a daily basis for electronic meetings, distributed electronic education and daily work It creates a new teamwork environment which allows users to collaborate even if they are not present at the same physical location. The mStar environment includes: the multicast WhiteBoard - mWB, which allows for collaborative reviewing of text and images; mChat, which allows for text based group chat; mVote, which allows for distributed voting and mWeb for shared WWW objects. These are all desktop and IP-multicast based and symmetric. The mStar environment also includes mMOD, which is a VCR-like tool for recording and playback of teamwork sessions, and mTunnel, which is an application for handling IP-multicast traffic on narrow links in the network (such as ISDN/modem) and network segments that does not support IP multicast. It allows for scaling and transforming of the network based data in various ways.

  • 772.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    The mStar environment: scalable distributed teamwork using IP multicast1997Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis addresses the question of how a scalable, distributed teamwork environment should be designed and realized. Central design criteria includes that the system should be scalable and robust, allow for easy access and be symmetric. The system should allow for project team members to collaborate even though they are not located at the same physical location. The resulting system presented in this thesis, called the mStar environment have been created to address exactly these questions. mStar is scalable and robust through the usage of standard networks and IP-multicast, it allows for easy access as it is desktop based and finally it is symmetric allowing for easy peer-communication. mStar includes support for desktop conferencing, including mAudio for audio, reuse of the MBone Vic tool for video, mWB for whiteboard, mChat for text based chat and mVote for voting. It also supports distributed synchronized presentations using the WWW and the mWeb application. As all traffic is network and IP-multicast based it allows for easy recording and playback of teamwork sessions using the mMOD application. To allow for easy access to users behind non-multicast capable network segments (primarily modem and ISDN), mTunnel was created. It allows for tunneling and transformation of the traffic. Another member of the mStar environment is Director for remote control of video equipment. mStar also includes support for easy creation of new teamwork tools and applications using the Tunable Multicast Platform - /TMP and the Generic Agent Architecture. The mStar environment can be used and is being used on a daily basis for electronic meetings, distance education and lectures, and daily teamwork. The usage mStar creates group awareness between project members and helps users from not becoming isolated from their department and project team. mStar allows for usage 24 hours a day and have resulted in, among other things, a new usage patterns, which resembles electronic corridors more than specific meetings, where users can and do meet spontaneously to talk about anything they want, but also overhear other interesting and important conversations just as in a physical office corridor.

  • 773.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Mattsson, Mattias
    Luleå University of Technology.
    Synnes, Kåre
    Schefström, Dick
    Luleå University of Technology.
    The mWeb presentation framework1997In: Computer networks and ISDN systems, ISSN 0169-7552, E-ISSN 1879-2324, Vol. 29, no 8, p. 1083-1090Article in journal (Refereed)
    Abstract [en]

    This paper presents a framework for bringing the MBone and the World-Wide web closer together by introducing real-time distribution of HTML-pages and synchronization of WWW-browsers. This framework will enable distributed presentations of WWW-material using the mWeb application. Distribution is done using two new protocols, scalable reliable real-time transport protocol-SRRTP and scalable reliable file distribution protocol-SRFDP. Synchronization is achieved using the WebDesk control bus, which allows for scalable messaging in large groups of programs and hosts. This paper also presents how the mWeb application can be used for programmed presentations resulting in a television-like Web-TV. The mWeb framework also includes support for creating HTML-slides and the usage of semantic remote-pointers.

  • 774.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Mattsson, Mattias
    Synnes, Kåre
    Schefström, Dick
    The WebDesk framework architecture and design1997Conference paper (Refereed)
    Abstract [en]

    This paper presents an easy-to-use service creation platform for realization of applications handling real-time streams and data. This platform, called WebDesk, is implemented using the platform independent Java language. WebDesk includes an application-level network layer, called the Tunable Multicast Platform - /TMP which is presented, as well as a couple of applications exemplifying the usage of /TMP; the audio- and whiteboard-agents, and the mWeb-application. The mWeb is an application for scalable distribution of HTML-files and synchronization of web browsers.

  • 775.
    Wallin, Stefan
    Erisoft AB, Sweden.
    Measuring the properties of an information model: the IM meter1996In: NOMS '96: 1996 IEEE Network Operations and Management Symposium, Kyoto, Japan, April 15 - 19, 1996, Piscataway, NJ: IEEE Communications Society, 1996, p. 262-265Conference paper (Refereed)
    Abstract [en]

    It is important for us to measure the features of various information models (IMs), because it will give us the opportunity to distinguish which models that are more complicated than others. With this measure it is also possible to estimate for example, the lines of code in the implemented product and the cost and time effort needed to make the product. It is also possible to discover which parts of the model that are most complex and thereby know which part that will need the most time to implement. The IM Meter is able to measure the significant properties of various information models such as complexity and information content. The measures the IM Meter deals with are of various sorts. Some of them measure the features of minor details of the information models while other measure more general and extending properties. The present paper considers telecommunications management network (TMN) interface complexity in particular

  • 776.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Mattsson, Mattias
    Synnes, Kåre
    mWeb: a framework for distributed presentations using the WWW and the MBone1996Conference paper (Refereed)
    Abstract [en]

    This paper presents a framework for bringing the MBone and the World-Wide Web closer together by real-time distribution of HTML-pages and synchronization of WWW-browsers. This framework will allow for distributed presentations with WWW-material using the mWeb application. Distribution is done using two new protocols, Scalable Reliable Real-time Transport Protocol - SRRTP and Scalable Reliable File Distribution Protocol - SRFDP. Synchronization is achieved using the WebDesk Control Bus which allows for messaging in large groups of programs and hosts. This paper also presents how the mWeb application can be used for programmed presentations resulting in a television-like Web-TV. 1 Introduction The World-Wide Web (WWW) is today mostly used as a request application where the end-user tells a browser to fetch a page which is then displayed. Imagine instead your WWW-browser being used as a broadcast 1 receiver where the user tunes into a channel and starts watching the HTML-pages being d...

  • 777.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    RTP/SRM extension (Scalable Reliable Real-time Transport Protocol - SRRTP)1996Report (Other academic)
    Abstract [en]

    An Internet-Draft describing my extension of RTP (RFC1889) to include the ideas of the SRM framework

  • 778.
    Degermark, Mikael
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science. Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Pink, Stephen
    Swedish Institute of Computer Science, Kista, Sweden.
    Soft state header compression for wireless networks1996Report (Refereed)
  • 779.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    Synnes, Kåre
    WebDesk - Collaboration Support in MATES1996In: Proceedings of the European Workshop on Global Engineering Network, 1996Conference paper (Refereed)
    Abstract [en]

    Combining Messaging, Realtime Interaction and Publishing into the work environment of the future A paper the architecture and design of the WebDesk

  • 780.
    Degermark, Mikael
    et al.
    Luleå tekniska universitet.
    Köhler, Torsten
    Luleå tekniska universitet.
    Pink, Stephen
    Luleå University of Technology.
    Schelén, Olov
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Advance reservations for predictive service1995In: Network and Operating Systems Support for Digital Audio and Video: Proceedings of the 5th International Workshop on Network and Operating System Support for Digital Audio and Video / [ed] Thomas D C Little; Riccardo Gusella, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 1995, p. 1-15Conference paper (Refereed)
    Abstract [en]

    We extend a measurement-based admission control algorithm suggested for predictive service to provide advance reservations for guaranteed and predictive service while keeping the attractive features of predictive service. The admission decision for advance reservations is based on information about flows that overlap in time. For flows that have not yet started, the requested values are used, and for those that have already started measurements are used. This allows us to estimate the network load accurately for the near future. To provide advance reservations we ask users to include durations in their requests. We provide simulation results to show that predictive service with advance reservations provides utilization levels significantly higher than those for guaranteed service.

  • 781.
    Wallin, Stefan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science. Erisoft, Sweden.
    Building Large O-O Systems1995In: Technology of object-oriented languages and systems, TOOLS 16: Proceedings of the Sixteenth International Conference TOOLS Europe '95 / [ed] Ian Graham, Prentice-Hall, 1995, p. 185-191Conference paper (Refereed)
  • 782.
    Parnes, Peter
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    Synnes, Kåre
    Webdesk: the tele-conferencing service of mates1995Conference paper (Other academic)
    Abstract [en]

    A paper describing early results of the WebDesk development within the Mates-project, Summer 1995. Presented at the Second International SMAC Workshop, November 1995.Also presented at BOF: Towards a Real-Time Multimedia Web, December 1995

  • 783.
    Ödling, Ola
    et al.
    Erisoft AB, Sweden.
    Wallin, Stefan
    Erisoft AB, Sweden.
    Building MIB Applications1994In: IEEE Network Operations and Management Symposium: Symposium Record : Wednesday, February 16: Sessions 11 - 20, Piscataway, NJ: IEEE Communications Society, 1994, Vol. 2, p. 565-575Conference paper (Refereed)
  • 784.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Multimedia communications-deriving network requirements from applications1994In: Proceedings of the Twenty-Seventh Hawaii International Conference on System Sciences: Vol.III: Information Systems: Decision Support and Knowledge-Based Systems, IEEE Communications Society, 1994, p. 609-618Conference paper (Refereed)
    Abstract [en]

    Many of the visions of new usages of telecommunications have been bound to the concept of multimedia, a maybe overloaded word which at a user level seems to denote a desire to utilize richer ways of interacting with terminals. Examples include teleconferencing, distance work, distance education, distance consultancy, distant information access, etc. That is, most of what we do today, but independent of physical proximity. Many technical challenges remain, and one is the design of the global network platform that is to enable those services. We discuss what is special to multimedia communications, derive a number of requirements based on a model of typical services and applications, and propose a new higher level of support to enable the efficient production of such systems

  • 785.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Computer supported systems development1993Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis deals with the design and construction of System Development Environments, that is the use of computers to make software intensive development work more efficient and predictable. The results are centered around the construction of such a development environment. A major theme and contribution is in extending the support provided by such environments from single user scenarios to large projects involving coordinated teams of developers. The thesis consists of seven parts, and starts out with a database oriented view of the problem. The basic idea is that all data objects created during the life of a project should be collected in a database, that also represents the various dependencies and relationships between the objects. 'Me state of a project is then defined in terms of those data, and their evolution corresponds to the evolution of the project. Automation is achieved by a rich number of surrounding tools which have access to this database. The first paper describes the design of this database by generalizing and extending the role of the Ado program library. The main contribution is in the benefits then achieved in terms of automatic data collection and consistency management. Another important result is the basic mechanisms for support of version handling. Several following papers show how to extend existing results into explicit support for programming-in-the-large, in contrast to the single person and local context support that has long dominated the thinking. This also leads to new results in supporting teams of programmers, with the problem of managing parallel change and continuous reintegration of results. The importance of several levels of abstraction and interactive data navigation support is discussed, and solutions are described. The problem of keeping data from different development phases consistent is identified, and solution principles are developed. Besides extending environments functionality towards larger projects. the thesis provides new results in how to architect those environments internally. A central concept is integration, that is the coordination between different tools to make them cooperate towards a common goal. This stands, however, often in conflict with other requirements, such as subsystem separation and autonomy. Several approaches to handle this dilemma are described. A widely accepted definition and analysis of the concept of integration is also presented. The final part, which is the most extensive, generalizes the experiences of the project in the light of a broad survey of other results. It provides an extensive overview of problem statements, solution techniques, and technology important to the construction of system development environments. The most important direction for the future is in further support for work in distributed teams. The areas of computer supported cooperative work, distributed systems, process modelling, workflow management. and broadband communications will be merged into new innovative approaches. The future development environment will a) to a large extent be an interperson communication environment; b) generalize so that most of it can be applied not only to system development, but to all situations where people work together in projects.

  • 786.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    The Arcs Experience1991In: Proceedings of the 3rd European Software Engineering Conference: ESEC '91, Milan, Italy, October 21 - 24, 1991 / [ed] A. van Lamsweerde, Encyclopedia of Global Archaeology/Springer Verlag, 1991, p. 443-464Conference paper (Refereed)
  • 787.
    Wallin, Stefan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A hypertext knowledge based for primary care - LIMEDS in LINCKS1989In: SIGIR '89: proceedings of the Twelfth Annual International ACMSIGIR Conference on Research and Development in Information Retrieval, Cambridge, Massachusetts, USA, June 25 - 28, 1989 / [ed] Nicholas J Belkin ; C. van Rijsbergen, New York: ACM Digital Library, 1989, p. 221-228Conference paper (Refereed)
    Abstract [en]

    In organized health care, primary care is the first level. It is characterized by the wide span of health problems managed as well as remote location from traditional medical information and knowledge sources. The LIMEDS project has formulated the special requirements for integrated knowledge and data base management in primary care. This paper presents Gösta's book, a hypertext knowledge base implemented in LINCKS, an object oriented, networked database system. Firstly, aspects which make integrated hypermedia systems particularly suitable for application in primary health care are explored. We then describe the hypertext knowledge base, consisting of 500 basic text objects and 3000 links, and current implementations using the NODE data model. NODE is implemented on a SUN III fileserver, and the user interface for the hypertext context on Apple Macintosh (TM). Combination of design methods towards a parallel means-ends strategy was found to be necessary to achieve Gösta's book. Design groups need to be composed of computer science, medical, psychological and organizational competences

  • 788.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    The system-oriented editor: a tool for managing large software systems1987In: Using Ada: ACM SIG Ada international conference. Boston, USA, December 8-11, 1987, New York: ACM Digital Library, 1987, p. 56-59Conference paper (Refereed)
  • 789.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Integrating Ada in an existing environment: the Arcs example1986In: Ada - managing the transition: proceedings of the Ada-Europe International Conference, Edinburgh, 6-8 May 1986 / [ed] Peter J.L. Wallis, Cambridge University Press, 1986, p. 183-196Conference paper (Refereed)
    Abstract [en]

    Undertaking the transition to Ada today will to most of us not mean using a full APSE, (DOD80, BUX80), tailored for this purpose. Instead, this transition must be made by using an existing environment, incrementally integrating its proven tools and concepts in the realm of Ada. This paper describes one effort taking this approach, where the UNIX revision control tool RCS, (TIC85), is integrated with an Ada program library, using UNIX style library interface.

  • 790.
    Närfelt, Kjell-Håkan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Extending the scope of the program library1985In: Ada in use: proceedings of the Ada International Conference, [Paris, 14 - 16 May], 1985 / [ed] John G.P. Barnes; Gerald A. Fisher, Cambridge: Cambridge University Press, 1985, p. 25-40Conference paper (Refereed)
    Abstract [en]

    The idea of a database as a central facility of a programming environment is explored, taking the Ada program Library as a starting point. The database used is based on a node model similar to the one proposed in the CAIS standard (KIT/KITIA 1984). The paper suggests an expansion of the scope of the program library into the area of configuration and version management in an environment with several ungoing projects sharing software objects. The authors furthermore present a technique for the manipulation of the relationships in a relational algebra inspired way - providing some of the powerful capabilities of the relational approach within the context of node models

  • 791.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    On data organization in programming environments1985Licentiate thesis, monograph (Other academic)
  • 792.
    Närfelt, Kjell-Håkan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Towards a kapse database1985In: Medical information processing / [ed] Terry M. Walker, Western Periodicals , 1985, Vol. 3, p. 756-757Conference paper (Refereed)
    Abstract [en]

    The idea of a database as a central facility of a programming environment is explored by presenting the TeleSoft/TeleLogic Library Manager (LM), a database aimed at forming the basis for an integrated Ada programming support environment. The abstract takes the Ada program library as a starting point: an Ada Library will constitute an essential part of an Ada programming environment, by acting as a repository for software associated data, collected at least during the development phase.

  • 793.
    Närfelt, Kjell-Håkan
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Towards a kapase database1984In: IEEE Computer Society 1984 Conference on Ada Applications and Environments, October 15 - 18, 1984, Sheraton Midway Hotel, St. Paul, Minnesota, Silver Spring, Md: IEEE Communications Society, 1984Conference paper (Refereed)
    Abstract [en]

    The idea of a database as a central facility of a programming environment is explored, taking the Ada program library as a starting point. Instead of tight tailoring to these needs, a more general data model is supported, giving an opportunity to expand the scope of the Ada program library.

  • 794.
    Schefström, Dick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Realtidsspråk: implementering och användning1981Report (Other academic)
13141516 751 - 794 of 794
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