The last decade saw long-awaited improvements in our understanding of active galactic nuclei (AGN) spectral properties. This contribution reviews some important observational results obtained from optical and UV data as well as constraints on physical parameters that control the structure and dynamics of the Broad Line Region.

We present an efficient method within an active vision framework for recognizing objects which are ambiguous from certain viewpoints. The system is allowed to reposition the camera to capture additional views and, therefore, to resolve the classification result obtained from a single view. The approach uses an appearance based object representation, namely the parametric eigenspace, and augment...

The paper addresses the question how the benefits of active networking, such as customized packet processing in the data path and flexible service management, can be achieved in a telecom environment. More precisely, we ask: How can a network provider, whose infrastructure is based on active networking technology, support a large number of customers, all of which independently install, run, and...

Statistical models of the shape and appearance of image structures can be matched to new images using both the Active Shape Model [7] algorithm and the Active Appearance Model algorithm [2]. The former searches along profiles about the current model point positions to update the current estimate of the shape of the object. The latter samples the image data under the current instance and uses th...

We investigate the impact of introducing active networking on traditional packets flowing through the active nodes of a network. Using two approaches, the process algebra formalism PEPA and the simulation package SimJava, we compare the performance of an active node and of a traditional one. We are mainly interested in performance measures such as loss rates of standard packets and the node lat...

These networks are experiencing an exponential rise in the number and activity of users in recent years, leading to problems of scalability and increasing spam. Most OSNs currently impose restrictions on the number of social links that a user can have, in order to reduce strain on the OSN infrastructure and to prevent spammers from contacting large number of users indiscriminately. However, suc...

The deterministic active appearance model (AAM) tracker fails to track objects under occlusion. In this paper, we discuss two approaches to improve this tracker ’s robustness and tracking results. The first approach initialises the AAM tracker with a shape estimate obtained from an active contour, incorporating shape history into the tracker. The second approach combines AAMs and the particle f...

Future requirements for a broadband multimedia network are likely to be very different from those of today. Three key changes are identified; rapid introduction of new services, dynamic customisation of services by clients, and minimal management overhead. Application layer active networking, perhaps the most pragmatic and immediately realisable active network proposal, is a potential solution ...

Future requirements for a broadband multimedia network are discussed and a vision of the future network is presented. Three key needs are identified; rapid introduction of new services, dynamic customisation of services by clients, and minimal management overhead. Application layer active networking, perhaps the most pragmatic and immediately realisable active network proposal, is a potential s...

In the past a significant amount of work has been invested on architecting active node platforms that solve problems in various application areas by means of programmability. Yet, much less attention has been paid to the deployment aspects of these platforms in real networks. An open issue in particular is how active resources can be discovered and deployed. In this paper we present SAND, a sca...