Accepted Papers

    Md. Jalil Piran1, Zhu Han2,1Department of Computer Engineering, Sejong University, South Korea,2Department of Electrical and Computer Engineering, University of Houston, USA

    In order to save network bandwidth and simultaneously aceive high quality video, this paepr proposes a method for joint optimization of video content bitrate and detection of short and long time opportunities based on lisencees activities and channel idle time distribution. In this method the pre-recorded content is divided into some periods based on scences’ complexity. To allocate chennl to the periods, we need to identify the lisencees avtivity and maximize opportunistic utilization accordingly. Based on the lisencess activities by a Byasian non-parametric inference model, and according to channel idle time, we clasify short and long transmission opportunities. We map the available spectrum channels to the content periods according to the quality of channels and bitrate of the periods. Furthermore, due to dynamic nature of availability of channels and to avoid interruption, we propose to switch transmission of the periods with low bitrate to underlay mode when there is not any more opportunity for SU transmission. Our simulation results show that more than 24% of the fixed allocated bitrate for transmission of a content can be saved by employing the proposed method.


    Business process models (BPMs) describe tasks achieved by business workers to reach business goals. With the advancements in the Information Technology (IT), the use of software systems as a support for the business process becomes increasingly dominant and critical. Ideally, software design starts with acquiring knowledge from the BPMs to understand the current context (as-is- system), to outline the target system (to-be- system) and to identify the user requirements (URs) that fulfill business goals. Nevertheless, often the modeling of business processes ( BPs) and of ISs are carried out separately. This leads to a misalignment between them. Although, years of research have gone into seeking tools that support business process aligned with IS, the transition of business process to IS modeling is still highly manual and the alignment of BPMs and information system models (ISMs) is still far from reach.

    To bridge the gap between BPMs and ISMs we propose, in this paper, a MDA approach named BPMN2UC to generate UML use cases (UCs) that represent URs towards the IS. To do this, we first carry out pre-treatments on the BPMN model to allow for a quasi-automatic UC generation. Then, we propose a set of transformation rules based on the semantics of BPMN and UML modeling elements. In addition to UC diagram, we generate also a textual description for each generated complex UC in order to help the system designer to understand its scenarios. To improve our approach, we apply it on a case study. Also, our approach is implemented with EMF tools and our transformation rules are specified by ATLAS Transformation Language (ATL) for generating the UC diagram and Acceleo Templates principle to generate the textual descriptions of complex UCs.








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