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  • 1.
    Anani, Adi
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    M-learning in review: Technology, standard and evaluation2008In: Journal of Communication and Computer, ISSN 1548-7709, Vol. 5, no 11, p. 1-6Article in journal (Refereed)
    Abstract [en]

    Nowadays E-learning as a form of learning depending on networks and computer devices has been expanding by leaps and bounds. As a special kind of E-learning, M-learning (mobile learning) aims at the use of mobile devices anywhere at anytime by anybody. In this paper, the technologies to develop a M-learning system is deeply analyzed according to the layer model at first. Secondly, from the view of application, the standardization in M-learning is researched in order to accelerate the development and popularization of M-learning. Finally, quality estimation of M-learning system is discussed from the view of QoE (quality of experiences). The experience form end-user is the sole effective norm to judge the result of M-learning technology. It is no doubt that technologies, standardization and evaluation will play very important parts in the course of M-learning development.

  • 2.
    Anani, Adi
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Diagnostic instrument for children with reading disorders2006In: International Journal of Scientific Research, ISSN 1021-0806, Vol. 16, p. 167-170Article in journal (Refereed)
    Abstract [en]

    A simple and cost-effective wearable gaze tracking system is designed to observe the readingpattern of patients with reading disorders in order to facilitate for the work of ophthalmologists andthe multidisciplinary treating teams in making reliable diagnosis. The system constitutes of twominiaturized cameras mounted on a headset; one for eye tracking and one for the scene. The eyetracking information is combined with information extracted from the picture of the forwardlooking camera to online identify the gaze point. When reading a text the gaze point moves and areading pattern is created.

  • 3.
    Anani, Adi
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Zhang, Deng-yin
    Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, China.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    QoS-guaranteed packet scheduling in wireless networks2009In: The Journal of China Universities of Posts and Telecommunications, ISSN 1005-8885, Vol. 16, no 2, p. 63-67Article in journal (Refereed)
    Abstract [en]

    To guarantee the quality of service (QoS) of a wireless network, a new packet scheduling algorithm using cross-layer design technique is proposed in this article. First, the demand of packet scheduling for multimedia transmission in wireless networks and the deficiency of the existing packet scheduling algorithms are analyzed. Then the model of the QoS-guaranteed packet scheduling (QPS) algorithm of high speed downlink packet access (HSDPA) and the cost function of packet transmission are designed. The calculation method of packet delay time for wireless channels is expounded in detail, and complete steps to realize the QPS algorithm are also given. The simulation results show that the QPS algorithm that provides the scheduling sequence of packets with calculated values can effectively improve the performance of delay and throughput.

  • 4.
    Halawani, Alaa
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Anani, Adi
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Building eye contact in e-learning through head-eye coordination2011In: International Journal of Social Robotics, ISSN 1875-4791, Vol. 3, no 1, p. 95-106Article in journal (Refereed)
    Abstract [en]

    Video conferencing is a very effective tool to use for e-learning. Most of the available video conferencing systems suffer a main drawback represented by the lack of eye contact between participants. In this paper we present a new scheme for building eye contact in e-learning sessions. The scheme assumes a video conferencing session with “one teacher many students” arrangement. In our system, eye contact is achieved without the need for any gaze estimation technique. Instead, we “generate the gaze” by allowing the user communicate his visual attention to the system through head-eye coordination. To enable real time and precise headeye coordination, a head motion tracking technique is required. Unlike traditional head tracking systems, our procedure suggests mounting the camera on the user’s head rather than in front of it. This configuration achieves much better resolution and thus leads to better tracking results. Promising results obtained from both demo and real time experiments demonstrate the effectiveness and efficiency of the proposed scheme. Although this paper concentrates on elearning, the proposed concept can be easily extended to the world of interaction with social robotics, in which introducing eye contact between humans and robots would be of great advantage.

  • 5.
    Halawani, Alaa
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    ur Réhman, Shafiq
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Anani, Adi
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Active vision for controlling an electric wheelchair2012In: Intelligent Service Robotics, ISSN 1861-2776, Vol. 5, no 2, p. 89-98Article in journal (Refereed)
    Abstract [en]

    Most of the electric wheelchairs available in the market are joystick-driven and therefore assume that the user is able to use his hand motion to steer the wheelchair. This does not apply to many users that are only capable of moving the head like quadriplegia patients. This paper presents a vision-based head motion tracking system to enable such patients of controlling the wheelchair. The novel approach that we suggest is to use active vision rather than passive to achieve head motion tracking. In active vision-based tracking, the camera is placed on the user’s head rather than in front of it. This makes tracking easier, more accurate and enhances the resolution. This is demonstrated theoretically and experimentally. The proposed tracking scheme is then used successfully to control our electric wheelchair to navigate in a real world environment.

  • 6.
    Karlsson, Johannes
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Anani, Adi
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Enabling real-time video services over ad-hoc networks opens the gates for e-learning in areas lacking infrastructure2009In: International Journal of Interactive Mobile Technologies (iJIM),, ISSN 1865-7923, Vol. 3, no 4, p. 17-23Article in journal (Refereed)
    Abstract [en]

    In this paper we suggest a promising solution to come over the problems of delivering e-learning to areas with lack or deficiencies in infrastructure for Internet and mobile communication. We present a simple, reasonably priced and efficient communication platform for providing e-learning. This platform is based on wireless ad-hoc networks. We also present a preemptive routing protocol suitable for real-time video communication over wireless ad-hoc networks. Our results show that this routing protocol can significantly improve the quality of the received video. This makes our suggested system not only good to overcome the infrastructure barrier but even capable of delivering a high quality e-learning material.

  • 7.
    Zhang, Deng-yin
    et al.
    Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.
    Chen, Jia-ping
    Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications,China.
    Anani, Adi
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    An adaptive image watermarking algorithm based on perceptual model2008In: Journal of Communication and Computer, ISSN 1548-7709, Vol. 5, no 2, p. 1-7Article in journal (Refereed)
    Abstract [en]

    An adaptive image watermarking algorithm based on Watson’s perceptual model is proposed in this paper. The proposed watermarking algorithm fully considers image regional characteristic. First, the cover image is divided into different smooth regions according to its gray value. Then watermark adjustment factors of those different regions are calculated respectively based on Watson’s perceptual model. The watermark is embedded by the adjustment factors at last. Experiments show that the proposed algorithm has excellent imperceptibility and has little influence upon the eigenvalue of the cover image.

1 - 7 of 7
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