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Quantum‐dot spin vertical‐cavity surface‐emitting lasers (VCSELs) are a relatively new addition to the spin‐VCSELs literature. The quantum‐dot active region, apart from the usual advantages carried by the quantum confinement in all three directions, offers additional degrees of freedom for the manipulation of the polarization of the emitted light. In, the present contribution, a detailed analysis...
Fog computing is considered as the most promising enhancement of the traditional cloud computing paradigm in order to handle potential issues introduced by the emerging Interned of Things (IoT) framework at the network edge. The heterogeneous nature, the extensive distribution and the hefty number of deployed IoT nodes will disrupt existing functional models, creating confusion. However, IoT will...
Automotive industry will be greatly benefited by the advent of 5G Networking and the huge boost in performance and coverage it will support. Road safety and traffic efficiency services will be significantly upgraded through seamlessly interconnected devices, while latency decrease will most likely allow autonomous driving to become a commodity, available to everyone. This technology will have a huge...
We present Hammer, a real-world, end-to-end network traffic simulator, capable of simulating complex and dynamic network, user and server behaviors. The focus of this tool is to primarily facilitate investigations related to product stability, for instance different aspects of capacity, longevity, memory leaks, cores and also handle customer content testing that will reveal the behavior of the device...
The necessity for distributed parallel multimedia processing capacity in the multimedia-aware cloud derives from the fact that it must provide both data storage and computational resources to the whole number of interconnected users. When an application or a service becomes popular, the underlying system needs to scale up efficiently thus introducing the distributed factor into the overall scheme...
The advent of 5G Networks introduces significant challenges in almost every link of the network value chain. The demand for seamless connectivity, extremely low latency, high-speed data transfer and energy efficiency along with the exponential increase of interconnected devices will shape an ecosystem with such complexity that enforces the replacement of almost every current standard. It is therefore...
This article presents a novel, end-to-end, quality-aware optimization framework for multimedia clouds, where path selection mechanisms are exploited in conjunction with media optimization in order to support multimedia delivery in a quality-aware manner. As wireless data traffic worldwide is characterized by exponential growth, with the most prominent part being multimedia services, consumers get...
Scalable video enables flexible video delivery over IP networks. The adaptation of the video content to the network configuration and the networking conditions is the great advantage of scalable video. In this research work, on-demand H.264 SVC video delivery over wireless multi-hop single-frequency networks is studied. The main objective is to achieve the highest levels of video quality possible...
Three Dimensional video quality comprises a variety of perceptual attributes, including overall image quality, naturalness, presence, perceived depth, comfort, immersiveness, etc. This paper proposes a novel objective QoE model for 3D video streaming that takes into account network parameters (i.e. packet losses)and is based on the relationship between objective and subjective video quality measures...
Residential networks such as ADSL have limited upstream capabilities. This research work presents a simulation study on how video stream in the uplink direction can be optimized using H.264 SVC coding through a combination of hybrid and residential networks. In this work, a cooperative mechanism for SVC video streaming over residential wireless networks is studied. In the proposed architecture we...
This paper describes the ROMEO architecture for live 3D multi-view video delivery over peer-to-peer networks. The scope of the European founded Integration Project ROMEO encompasses addressing the challenges of live multiview video delivery over heterogeneous networks (WiFi, LTE, DVB, etc.) and diverse user equipment (mobile, portable, fixed). In order to achieve seamless uninterrupted 3D video delivery...
Telecommunication market today is defined by a plethora of innovative products and technologies that constantly raising the bar of technical feasibility in both hardware and software. Meanwhile users constantly demand better quality and improved attributes for all applications, becoming less and less tolerant in errors or inconsistencies. Evaluation methods that were dominant for several years in...
This paper proposes a novel architecture that integrates Media Independent Handover (MIH) 802.21 framework and IP Multimedia Subsystem (IMS) functionalities in order to support multimedia services across intertechnology Radio Access Networks (RANs) in a secure and seamless manner. MIH framework is responsible for deciding and triggering a handoff based on physical, network and application layer statistics...
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