Papers by Mohammad Hammouri
System Analysis and Modeling. Languages, Methods, and Tools for Systems Engineering, 2018
This paper deals with deriving a distributed design model from a global requirements model writte... more This paper deals with deriving a distributed design model from a global requirements model written in the notation of Hierarchical State Machines (HSMs). In this paper, we extend the UML notation of HSMs to describe the roles (components) that participate in the actions of each state of the global behaviour. A simple state represents some local actions, while a hierarchical state usually represents a collaboration between several roles (system components). Our global HSM requirements model describes the sequencing of collaborations and local actions. We compare this notation with other notations such as UML Collaborations, Hierarchical Message Sequence Charts (HMSC), Activity Diagrams, Partial-Order(PO)-Charts and others. Then we explain how a distributed design model, including all required coordination messages between the different system components, can be automatically derived from a global requirements model. We consider the following sequencing constraints between different c...
Medical Journal of Australia, 1978
I Denborough, M. A., Mse. J. AUST., 1977, 2: 757 (December 3). 2 Cain, P. A. and Ellis, F. R., Br... more I Denborough, M. A., Mse. J. AUST., 1977, 2: 757 (December 3). 2 Cain, P. A. and Ellis, F. R., Brit. J. Anaesth., 1977, 49: 941. 3 Ellis, F. R., Clarke, I. M. C, Appleyard, T. N. and Dinsdale, R. C W., Brit. med. J., 1974,4: 270. 4 Britt, B. A., Webb, G. F. and Le Due, C., Canad. Anuesth, Soc. J., 1974, 21: 371. S Harrison, G. G., Brit. med. J., 1971, 3: 454. 6 Moyes, D. G., Brit. J. Anaesth., 1973.45: 1163.
2018 IEEE/ACS 15th International Conference on Computer Systems and Applications (AICCSA), 2018
The significant advancements achieved in wireless communications over the past few years has faci... more The significant advancements achieved in wireless communications over the past few years has facilitated successful deployment of LTE-A, and heralded great efforts in 5G development. However, with the increase in the number and variety of connected devices, wireless video transmission in real-time is challenging for the aforementioned network paradigm. Many studies have shown that the centric focus of communications should be the content type, rather than the communication itself, which means real-time multimedia communications are considered crucial for future Internet architectures. This requires high capacity channels and techniques to mitigate inherent wireless channel errors. Thus, we propose an application-layer and middleware-based solutions that increase network reliability and flexibility and provide Quality of Service (QoS) control based on Scalable Video Coding (SVC). Due to the real-time and QoS support of the Data Distribution Service (DDS) middleware, it can be used to implement the three types of SVC scalability: Viz. Temporal, Spatial, Quality (SNR). The open source Scalable Video-streaming Evaluation Framework (SVEF) tool has been used to assess the video transmission performance with performance metrics, Viz. Peak Signal to Noise Ratio (PSNR), Mean Opinion Score (MOS), and frame delay. The results showed a graceful degradation of video quality when using the DDS-based SVC, particularly when the number of receivers is increased. The acquired results show excellent improvements which can be applied to different Future Internet architectures.
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Papers by Mohammad Hammouri