Πλοήγηση ανά Συγγραφέα "Manitsaris, Athanasios"
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Τεκμήριο Designing simplicity: usability perspectives on Learning Management Systems(2005) Fotaris, Panagiotis; Politis, Anastasios; Manitsaris, AthanasiosThis paper presents an experimental Learning Management System (LMS).The usability aspect of its functions serves as the main focus of this system because the potential for usability problems seems to be especially severe in LMSs, due to their ability to implement complex features and intricate interactions. In order to establish a more efficient e-learning environment, an LMS should have intuitive interfaces and clear information design, allowing learners to concentrate on learning and instructors on learning strategies. The proposed LMS includesall the important functions of delivering learning material, tracking learning activities and managing community tasks, yet by following recent usability techniques it manages to hide all this complexity. Moreover, providing a comprehensive idea of content organization and management along with a simple navigationtool, it allows learnersto focus on their learning activities without excessive hassleandinstructors, especially those unfamiliar withInformation Technologies,to profitably exploittheir learning resources.Τεκμήριο Establishing effective Learning Management Systems through simplicity(2005) Mastoras, Theodoros; Fotaris, Panagiotis; Politis, Anastasios; Manitsaris, AthanasiosDesigning a Learning Management System (LMS) is a combination of pedagogical design, usability and information architecture. E-Learning systems should have intuitive interfaces and clear information design, allowing learners to concentrate on learning and course developers on learning strategies, thus making e-learning more efficient. Hence, effective LMSs should include sophisticated and advanced functions, yet their interface should hide their complexity. In this paper we present the key features of an experimental LMS which follows recent usability techniques in order to accomplish simplicity. The usage of computer file management as a metaphor for management and navigation between Learning Objects (LOs) along with a clear and unambiguous user interface allow users to focus on their learning activities without excessive hassle.Τεκμήριο Exploiting multimedia frame semantics and MAC-layer enhancements for QoS provisioning in IEEE 802.11e congested networks(2011) Politis, Anastasios; Mavridis, Ioannis; Manitsaris, AthanasiosWireless Local Area Networks (WLANs) supporting modern streaming multimedia applications constitute a very challenging and rapidly changing field of research. Towards implementing effective multimedia wireless networks, the IEEE has published the “state of the art” IEEE 802.11e standard, which introduced a QoS-aware MAC-layer along with a series of efficiency enhancements. However, it has been proven inadequate in handling multimedia traffic optimally in periods of congestion. For the efficient support of multimedia applications in high load situations, numerous mechanisms have emerged, most of them focusing on altering the static nature of resource allocation specified in IEEE 802.11e. Nevertheless, traffic characteristics must be taken into consideration in order to achieve the highest gains. In this paper, an application-aware MAC-layer mechanism is developed that exploits multimedia frame semantics and existing MAC-layer enhancements to adequately cope with high congestion situations in IEEE 802.11e infrastructure networks. The proposed algorithm makes use of existing acknowledgment policies and adaptive resource allocation techniques depending on multimedia frame significance. The effectiveness of the algorithm is proven by means of simulations, where its functionality is evaluated and compared with other existing schemes.