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  • 1. Drugge, Mikael
    et al.
    Nilsson, Marcus
    Luleå tekniska universitet.
    Liljedahl, Urban
    Parviainen, Roland
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Methods for interrupting a wearable computer user2004In: Proceedings: Eighth IEEE International Symposium on Wearable Computers, ISWC 2004 : 31 October - 3 November 2004, Arlington, Virginia, Los Alamitos, Calif: IEEE Communications Society, 2004, p. 150-157Conference paper (Refereed)
    Abstract [en]

    A wearable computer equipped with a head-mounted display allows its user to receive notifications and advice that is readily visible in her field of view. While needless interruption of the user should be avoided, there are times when the information is of such importance that it must demand the user’s attention. As the user is mobile and likely interacts with the real world when these situations occur, it is important to know in what way the user can be notified without increasing her cognitive workload more than necessary. To investigate ways of presenting information without increasing the cognitive workload of the recipient, an experiment was performed testing different approaches. The experiment described in this paper is based on an existing study of interruption of people in human-computer interaction, but our focus is instead on finding out how this applies to wearable computer users engaged in real world tasks.

  • 2. Drugge, Mikael
    et al.
    Nilsson, Marcus
    Luleå tekniska universitet.
    Parviainen, Roland
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Experiences of using wearable computers for ambient telepresence and remote interaction2004In: Proceedings of the ACM SIGMM 2004 workshop on effective telepresence ETP 2004: Toward seamless remote interaction and experience, IEEE Communications Society, 2004, p. 2-11Conference paper (Refereed)
    Abstract [en]

    We present our experiences of using wearable computers for providing an ambient form of telepresence to members of an e-meeting. Using a continuously running e-meeting session as a testbed for formal and informal studies and observations, this form of telepresence can be investigated from the perspective of remote and local participants alike. Based on actual experiences in real-life scenarios, we point out the key issues that prohibit the remote interaction from being entirely seamless, and follow up with suggestions on how those problems can be resolved or alleviated. Furthermore, we evaluate our system with respect to overall usability and the different means for an end-user to experience the remote world

  • 3.
    Parviainen, Roland
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Large scale and mobile group communication systems2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This doctoral thesis examines different attributes of large scale group communication systems such as scalability, security and mobility by studying two different prototype systems - mIR (multicast Interactive Radio) and MES (Mobile E-meeting Services). mIR is a system for large scale real-time music distribution, designed as an interactive radio system for the Internet. MES is a collection of tools for improving the use of e-meeting and video conferencing tools in a mobile environment. The mIR prototype has been used to study scalability and security. Scalability in mIR concerns how to support as many users as possible without degrading the experience. This is achieved using IP multicast together with algorithms that limits the bandwidth usage regardless of the number of users. The work on security have focused on copy prevention through digital watermarking. By adding a unique watermark, i.e. a fingerprint, to each media copy a pirated copy can be traced back to a specific user, which can act as a deterrent. The thesis shows how we can combine the different goals of fingerprinting and IP-multicast while still maintaining the scalability features of multicast. Many issues need to be considered if e-meetings and video conferencing will become widespread and popular. Scalability and security, discussed in the first part of the thesis are two examples, and the second part of the thesis tries to address a third issue: mobility. In particular we are interested in enabling access to an e-meeting in a mobile environment, where we often have difficult conditions such as bad network connections, the user only have access to the Internet through a web browser or the available devices are small and limited. In many cases it is currently impossible to participate in an e-meeting when you're not in the office. The prototype system developed in the second part of the thesis aims to enable participation from any location and device that have some sort of Internet connection. We try to achieve this by allowing a mobile user to access an e-meeting session from a web browser or from a Java enabled mobile phone. Further, the system makes it possible to review missed events in an e-meeting as it is likely that there are many times where no Internet connection at all is available. The general style of work has been prototype driven with a goal of creating usable prototypes - i.e. the prototypes should be easy to deploy and it should be possible to use and test the prototypes daily. Most the prototypes described in this thesis have indeed been deployed and have seen daily use.

  • 4.
    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

  • 5.
    Parviainen, Roland
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    On large scale real time music distribution: security, reliability and heterogeneity2001Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis presents a system for real-time large scale distributed music distribution, such as radio on the Internet. The existing technologies do not enable the full potential that broadcast media on the Internet can give, such as a very large number of interactive receivers. A technology that can help achieve potential is IP-multicast, which enables broadcast applications to scale to millions of receivers. However, IP-multicast creates new problems that have to be solved for it to be used on the Internet; some of these problems are addressed in this thesis. The system presented in this thesis, mIR - multicast Interactive Radio, has been used as a prototype to implement and examine different solutions to some of the issues of IP-multicast and real time music distribution. These are problems such as heterogeneity, reliability and security. Heterogeneity and reliability are different aspects of the same problem: that IP-multicast is an unreliable Internet transport mechanism. In this thesis different methods for avoiding these problems are described and evaluated. Security in the context of IP-multicast has many aspects. While the problems of confidentiality and authentication have been extensively examined, there are still a few unresolved problems. One of these problems is traitor tracing: how to know the origin of illegal copies of a media object such as a radio transmission. An application of digital watermarking, fingerprinting, can be used to distinguish between different copies of the same media object, but requires that each copy is individually marked. This contradicts the basic property of multicast that ensures its scalability: that everyone receives exactly the same data. We show how we can combine the different goals of fingerprinting and IP-multicast while still maintaining the scalability features of multicast.

  • 6. Parviainen, Roland
    et al.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A web based history tool for multicast e-meeting sessions2004In: 2004 IEEE International Conference on Multimedia and Expo: June 27 - 30, 2004, Taipei, Taiwan, Piscataway NJ: IEEE Communications Society, 2004, p. 511-514Conference paper (Refereed)
    Abstract [en]

    This paper presents a web based history tool for multicast based e-meeting systems. The tool allow users to see past events and activity graphs of current and past sessions. Video snapshots are stored when events are reported, making it possible to quickly get an overview of the history of a session. This tool has several uses such as a quick and easily accessible way to improve group awareness, monitoring and review of meetings and lectures.

  • 7. Parviainen, Roland
    et al.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Large scale distributed watermarking of multicast media through encryption2001In: Proceedings of the International Federation for Information Processing, Communications and Multimedia Security Joint working conference IFIP TC6 and TC11, 2001, p. 149-158Conference paper (Refereed)
    Abstract [en]

    In this paper we describe a scheme in which each receiver of a multicast session receives a stream with a different, unique watermark, while still retaining the scalability of multicast. The watermarked streams can be used to trace those users who make unauthorized copies of a stream. The watermarking is enabled by encryption of two slightly different copies of the original stream with a large set of different keys.

  • 8. Parviainen, Roland
    et al.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Mobile instant messaging2003In: 10th International Conference on Telecommunications: ICT 2003 ; February 23 - March 1, 2003, Sofitel Coralia Maeva Beach Hotel, Tahiti, Papeete, French Polynesia, Piscataway, NJ: IEEE Communications Society, 2003, p. 425-430Conference paper (Refereed)
    Abstract [en]

    In this paper we describe a Mobile Instant Messaging system, MIM, designed for mobile environments. During design of mobile applications several new problems and possibilities have to be considered that do not exist with applications targeted at desktop PCs. One example of an application not designed for a mobile environment is current, very popular, instant messaging systems such as ICQ, AIM and MSN messenger. We describe why current systems are not suitable in a mobile environment and present our architecture for a new system, MIM, and show various implementations for different mobile devices such as PDAs, wearable computers and mobile phones.

  • 9. Parviainen, Roland
    et al.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Supporting E-meetings on Java capable mobile phones2003Report (Other academic)
    Abstract [en]

    In this paper we discuss different methods for providing group awareness to participants of e-meeting software using small, limited devices connected with limited networks such as a mobile phone. Currently small devices such as mobile phones are getting more advanced and capable of running custom software such as small Java applications while at the same time the available wireless networks are getting more pervasive and faster making it possible to connect to the Internet from anywhere, from almost any device. We describe the limitations of our target devices and methods to overcome these limitations for each media and present an implementation of some of these methods using an existing commercial e-meeting system.

  • 10. Parviainen, Roland
    et al.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    The MIM web gateway to IP multicast e-meetings2004In: Multimedia Computing and Networking 2004: 21 - 22 January 2004, San Jose, California, USA ; proceedings of Electronic imaging, science and technology, Bellingham, Wash: SPIE - International Society for Optical Engineering, 2004, p. 225-236Conference paper (Refereed)
    Abstract [en]

    As video conferencing and e-meeting systems are used more and more on the Internet and in businesses it becomes increasingly important to be able to participate from any computer at any location. Often this is impossible, since these systems requires often special software that are not available everywhere or impossible to install for administrative reasons. Many locations also lack the necessary network infrastructure such as IP multicast. This paper presents a WWW gateway system that enables users to participate using only a standard web browser. The design and architecture of the system are described and performance tests that show the scalability of the system are also presented.

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