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The shape transition of a one-layer thick strained island deposited on a semi-infinite substrate has been theoretically investigated from an energy variation calculation. It is found that depending on the misfit strain, the initially circular island may become unstable beyond a critical size and can evolve toward an elliptical shape. As the surface of the island increases, another transition is expected to occur which consists in the ellipse splitting into two identical circular islands of smaller size. A shape diagram is finally displayed for the island as a function of the misfit strain and island surface and a scenario of nanostructure evolution is discussed. [ABSTRACT FROM AUTHOR]

Quality of Service (QoS) provisioning in a converged network is a particularly difficult and yet extremely important task. With the coexistence of different types of services, it is challenging to manage and guarantee a good level of performance through manual customization of QoS policies. The Software-Defined Networking (SDN) paradigm can manage the QoS policies and network resources in an automatic and dynamic way through a controller. SDN orchestrates the equipment that supports the OpenFlow protocol. The Hybrid SDN approach provides the ability to manage SDN and legacy equipment. This paper introduces a new intelligent and flexible QoS management model based on the principle of SDN called "Efficient Resource Allocation" (ERA). Experiment comparisons between different QoS mechanisms demonstrate the effectiveness of our proposed model by minimizing delay, latency, jitter, and reducing loss rate. [Display omitted] • A new model based on the SDN paradigm for efficient QoS Management in a converged network is proposed. • The model aims to dynamically and adaptively manage bandwidth allocation. • The proposed model can manage Legacy equipment. [ABSTRACT FROM AUTHOR]