Digitala Vetenskapliga Arkivet

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  • 1.
    Guoqiang, Zhang
    et al.
    KTH, School of Electrical Engineering (EES), Sound and Image Processing.
    Dán, György
    KTH, School of Electrical Engineering (EES), Communication Networks.
    Kleijn, W. Bastiaan
    KTH, School of Electrical Engineering (EES), Sound and Image Processing.
    Lundin, Henrik
    Adaptive Playout Scheduling for Voice over IP: Event-Triggered Control PolicyIn: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166Article in journal (Other academic)
    Abstract [en]

    We study adaptive-playout scheduling for Voice over IP using the frame-work of stochastic impulse control theory. We use the Wiener process tomodel the fluctuation of the buffer length in the absence of control. In thiscontext, the control signal consists of length units that correspond to insert-ing or dropping a pitch cycle. We define an optimality criterion that hasan adjustable trade-off between average buffering delay and average controlsignal (the length of the pitch cycles added plus the length of the pitch cyclesdropped), and show that a band control policy is optimal for this criterion.The band control policy maintains the buffer length within a band regionby imposing impulse control (inserted or dropped pitch cycles) whenever thebounds of the band are reached. One important property of the band controlpolicy is that it incurs no packet-loss through buffering if there are no out-of-order packet-arrivals. Experiments performed on both synthetic and realnetwork-delay traces show that the proposed playout scheduling algorithmoutperforms two recent algorithms in most cases.

  • 2.
    Juhlin, Oskar
    Mobile Life VinnExcellence Centre.
    Social Media on the Road: Mobile Technologies and Future Traffic Research2011In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. January-MarchArticle in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    In the future, everyday life in traffic will be intricately meshed with city life. Today, motorways, city streets, toll roads, country roads, etc. are places where we spend a considerable amount of time, and where a large number of everyday encounters between people occur. Any road user’s journey coincides with several, sometimes hundreds or even thousands of other people’s journeys. But these encounters are brief and the interaction is slight. Mobile technologies and emergent social media provide us with new possibilities to support drivers and passengers beyond just helping them to reach their destination. We suggest that new technologies and applications could enhance social interaction in traffic and make life on the road more interesting and meaningful

  • 3.
    McGee, Kevin
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, MDALAB - Human Computer Interfaces.
    A Touch of the Future: Contact-Expressive Devices2004In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 11, no 1Article, review/survey (Refereed)
    Abstract [en]

    The importance of including contact expressions in different kinds of devices is discussed. The technical development of sensor-motor systems, tactile interfaces, and contact-expressive devices that embody and understand affect are also discussed. The existing attempts to describe human contact tend to be attempts to create general descriptive taxonomies. The development of semiotic models of imagery has helped in designing visual interfaces.

  • 4.
    McGee, Kevin
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, ASLAB - Application Systems Laboratory.
    A touch of the future: contact-expressive devices2004In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 11, no 1Article in journal (Other academic)
    Abstract [en]

    Contact-expressive devices could improve our lives -- from practical improvements that let us interact with devices when other modalities are impossible, inappropriate, or inadequate to devices that have important consequences for physical well-being. We can also imagine using contact expressions in devices that are pleasurable, playful, artistic, or otherwise important to a human's experience. This paper discusses the technical development of sensor-motor systems, tactile interfaces, and technologies that can embody and understand affect. Contact-expressive devices are technologies that understand and use touch in meaningful ways-that can distinguish between a press and a caress. Also discussed are the following issues: technical requirements and the nature of contact expressions. Although a fairly large body of research exists regarding nonverbal communication, the majority of this work is on visual expression (facial expressions, physical appearance, direction of gaze, physical posture, and other visible forms of body language) and paralinguistics (such as vocal inflection, pitch, volume, and speech rate). Work needs to begin on studies of human contact with the goal of leveraging those insights for the design of contact-expressive devices-and work needs to begin on the implementation of technologies that have rich contact-expressive range and appeal.

  • 5. Rocchesso, D.
    et al.
    Bresin, Roberto
    KTH, Superseded Departments (pre-2005), Speech Transmission and Music Acoustics.
    Fernström, M.
    Sounding objects2003In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 10, no 2, p. 42-52Article in journal (Refereed)
    Abstract [en]

    Interactive systems, virtual environments, and information display applications need dynamic sound models rather than faithful audio reproductions. This implies three levels of research: auditory perception, physics-based sound modeling, and expressive parametric control. Parallel progress along these three lines leads to effective auditory displays that can complement or substitute visual displays.

  • 6.
    Schwarz, Sebastian
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Olsson, Roger
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Sjöström, Mårten
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Depth Sensing for 3DTV: A Survey2013In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 20, no 4, p. 10-17Article in journal (Refereed)
    Abstract [en]

    In the context of 3D video systems, depth information could be used to render a scene from additional viewpoints. Although there have been many recent advances in this area, including the introduction of the Microsoft Kinect sensor, the robust acquisition of such information continues to be a challenge. This article reviews three depth-sensing approaches for 3DTV. The authors discuss several approaches for acquiring depth information and provides a comparative analysis of their characteristics.

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  • 7. Teng, Fei
    et al.
    Wang, Dian
    Yuan, Yue
    Zhang, Haibo
    Singh, Amit Kumar
    Lv, Zhihan
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Game Design.
    Multimedia Monitoring System of Obstructive Sleep Apnea via Deep Active Learning Model2022In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 29, no 3, p. 48-56Article in journal (Refereed)
    Abstract [en]

    Obstructive Sleep Apnea (OSA) is one of the most common sleep-related breathing disorders. Nearly 1 billion people worldwide suffer from it, causing serious health effects and social burden. However, traditional monitoring systems often fall short in terms of cost and accessibility. In this article, we first propose a deep active learning model to detect OSA events from electrocardiogram (ECG). We then designed and developed a prototype of OSA monitoring system using ECG sensor and smartphone, in which our OSA detection algorithm is implemented and validated. Experiments show that we achieve accuracy of 92.15% while using 40% of labeled data, significantly reducing the cost of labeling and maximizing the performance. According to detection results and health-related multimedia signals, we provide OSA risk level and medical advice to users. We believe that the multimedia monitoring system can efficiently help diagnose OSA, which could lead to effective intervention strategies and better sleep care.

  • 8.
    Wiberg, Mikael
    et al.
    Umeå University, Department of Information.
    Zaslavsky, Arkady
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Landscaping future interaction: special issue on mobile and ubiquitous multimedia2010In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 17, no 2, p. 12-15Article in journal (Other academic)
  • 9.
    Wiberg, Mikael
    et al.
    Umeå University, Faculty of Social Sciences, Department of Informatics.
    Zaslavsky, Arkady
    Department of Computer Science, Electrical and Space Engineering Computer Science, Luleå University of Technology .
    Landscaping future interaction: special issue on mobile and ubiquitous multimedia2010In: IEEE Multimedia, ISSN 1070-986X, E-ISSN 1941-0166, Vol. 17, no 2, p. 12-15Article in journal (Refereed)
1 - 9 of 9
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