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Multiview applications endow final users with the possibility to freely navigate within 3D scenes with minimum-delay. High-quality rendering of the scene is enabled by transmitting multiple high-quality camera views, which can be used to synthesize additional virtual views to offer a smooth navigation in the scene. When network resources are limited, the set of camera views needs to be properly selected...
The smooth video streaming over HTTP through 3G/4G wireless network is challenging as available bit rate in the internet changes due to sharing of network resources and time varying nature of wireless channels. The present popular technique Dynamic Adaptive Streaming over HTTP (DASH)provides solution up to some extent to stored-video, but the effective adaptive streaming of a live video remains a...
Cloud offloading -- leveraging remote cloud-based computing resources to execute energy-intensive functionality -- has become a common optimization technique for mobile applications. However, implementing cloud offloading techniques remains a delicate and complex task, reserved for expert programmers. If cloud computing is to realize its promise as a generally applicable, powerful optimization technique...
In this paper we discuss the potential effects of using various segment durations of the available contents within a simulated mobile environment. OPNET modeler was used to implement a real-time test platform for mobile video streaming using OPNET system in the loop component (SITL). The real-time test platform was then used to evaluate the performance of the requests for different segment size. Dynamic...
Eco-friendly energy sources (i.e. green power) attract great attention as lowering computer carbon footprint has become a necessity. Existing proposals on managing green energy powered systems show sub-optimal results since they either use rigid load power capping or heavily rely on backup power. We propose Chameleon, a novel adaptive green throughput server. Chameleon comprises of multiple flexible...
The growing interest in adaptive software systems has resulted in a number of different proposals for the design of adaptive systems. Some approaches adopt architectural models, whereas others model adaptation options, at the level of requirements. This dichotomy has motivated us to perform a comparative study between two proposals for the design of adaptive systems: the Rainbow Framework (architecture-based)...
Mobile cartography cannot directly copy the desktop mapping visualization because of small screen, low resolution and diverse performance of mobile terminal. Therefore, this paper puts forward an adaptive mobile cartography visualization method based on information of terminal devices. This method starts from presenting the terminal position of the location service, and generates a terminal-position-oriented...
Improving performance of Web services interactions is an important factor to burst the adoption of SOAin mission-critical applications, especially when they deal with large business objects whose transfer time is not negligible. Designing messages dynamic granularity (offloading) is a key challenge for achieving good performances. This requires the server being able to predict the pieces of data actually...
Systems based on service-oriented architecture are called service-based systems (SBS), and comprise of computing services offered by various organizations. SBS often require their services to be composed in complex workflows to perform their high-level tasks. The users usually have certain expectations on the overall QoS (quality of service) of their workflows. Due to the highly dynamic environments...
As business processes continue to gain relevance in different domains, dynamicity is becoming a great concern. Static processes no longer cover the actual needs of constantly changing environments, and process adaptation is a must in order to maintain competitive levels. While creating dynamically adaptable business processes can be a challenging task, undoing these adaptations is a natural functionality...
Configuration management is a complex task, even for experienced system administrators, which makes self-managing systems a desirable solution. Self-management implies the need for a model based on which configuration changes may be decided. In previous work, we described a method for constructing a state-transition model of application behavior, by observing the application in simulation. This method...
Due to the high cost of replication, incurred mainly by consistency management, it may be infeasible to use uninformed object replication in collaborative applications in pervasive environments, since resources are constrained, nodes are heterogeneous, and application behaviour is highly dynamic. Consequently, this paper proposes an adaptive replication scheme that dynamically creates and releases...
Nowadays, we are assisting to a paradigmatic shift for the development of web applications due to the pervasive distribution of their components among a lot of servers, which are dynamically interconnected by web links. As a consequence, the application logic is often defined by exploiting workflow languages since they are more suitable to address the complexity of these new running environments....
The expanding IPTV (Internet Protocol Television) market has begun to include the next generation IPTV services for new user experiences. And Open IPTV is one of the very important next services for the subscribers who want the chance to experience more various contents and services easily. This paper presents a policy-based service overlay IPTV framework for open strategy. We suggest that subscribers...
So far, little research has addressed reuse and context awareness with respect to rich Web-based user interfaces. Uniform models for encapsulation and reuse have been developed for the applicationspsila back ends in the form of Web Services, but this paradigm has not yet been applied to the presentation layer. Thus, UIs are usually hand-crafted and lack flexibility and reuse, which makes their development...
Society has become so dependent on information systems that provide the information underpinnings for critical infrastructure applications. With the development of network technology, these systems continue to emerge and grow, and have become unbounded networked systems that are highly distributed. But traditional security technology is not sufficient to deal with the protection and survivability...
Despite progress in model engineering, modeling large distributed systems is still a long and complex task. This paper outlines a methodology based on UML to make the modeling of a set of related systems simpler. A generic component-based framework specifies the commonality and variability of these systems at high-level of abstraction both from structural and behavioral viewpoint. Then, models of...
The vision of the Scientific Web is to enable research scientists to collaborate in a ubiquitous manner; sharing resources, data, and insights how to perform experiments. The grid provides the underlying computing infrastructure, thereby enabling workload sharing and distribution of computational tasks among millions of nodes. However, current collaboration tools in scientific grid environments do...
This paper presents Alembik, a framework for the transcoding of multimedia content. Alembik has been designed to adapt and transform image, audio and video files in a mobile Web environment. This objective is achieved through a collection of tags defined by the framework. Developers exploit the collection of tags to integrate and adapt multimedia information to the applications needs, as well as to...
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