Conservatoire national des arts et métiers

About: Conservatoire national des arts et métiers is a education organization based out in Paris, France. It is known for research contribution in the topics: Population & Orthogonal frequency-division multiplexing. The organization has 3573 authors who have published 7127 publications receiving 141430 citations. The organization is also known as: CNAM & Conservatoire des arts et métiers.

Integrating ontologies and thesauri for RDF schema creation and metadata querying

Abstract: In this paper we present a new approach for building metadata schemas by integrating existing ontologies and structured vocabularies (thesauri). This integration is based on the specification of inclusion relationships between thesaurus terms and ontology concepts and results in application-specific metadata schemas incorporating the structural views of ontologies and the deep classification schemes provided by thesauri. We will also show how the result of this integration can be used for RDF schema creation and metadata querying. In our context, (metadata) queries exploit the inclusion semantics of term relationships, which introduces some recursion. We will present a fairly simple database-oriented solution for querying such metadata which avoids a (recursive) tree traversal and is based on a linear encoding of thesaurus hierarchies.

Tailoring the Adaptive Augmented Reality (A 2 R) museum visit: Identifying Cultural Heritage professionals' motivations and needs

Abstract: The paper presents the new concept of Adaptive Augmented Reality (A2R), employed within the context of the creation of an AR guide for the museum visit The augmentations provided are not only visual but also acoustic, while the interest of the visitor is also monitored using physiological sensors, so that the multimedia content delivered to the visitor's see-through AR display with which she can interact through gesture interaction can be adapted according to her engagement and interests A theoretical framework is provided together with an overview of the system architecture This contribution focuses on the interdisciplinary, collaborative and UC-informed methodology employed for the identification and elicitation of the motivations and needs of the Cultural Heritage professionals as to the potential of the A2R approach for the museum visit

Performance Study of Multimedia Services Using Virtual Token Mechanism for Resource Allocation in LTE Networks

Abstract: The LTE specification provides QoS of multimedia services with fast connectivity, high mobility and security. However, 3GPP specifications have not defined scheduling algorithms to support real time and non-real time application services. In this paper we propose a modified version of M-LWDF and EXP/PF scheduling algorithms based on token mechanism, which provide better performance to real time flows such as video and VoIP in downlink system. By taking the arrival rates of packets to queues into account, the proposed mechanism included in previous scheduling algorithms, can increase remarkably the bit-rate for multimedia services. Simulation results show that the proposed modified algorithms can achieve a throughput gain for real time services specially for video traffic. Performance evaluation is conducted in terms of system throughput and packet loss ratio (PLR).

Tape-casting: Relationship between organic constituents and the physical and mechanical properties of tapes

Abstract: Alumina tapes, obtained by tape-casting, were produced from different slurry compositions. The effects of organic phase concentration on the mechanical and physical properties of green and fired tapes was measured. The amount of organic phase used did not influence the apparent density of green tapes as long as the volume of organics introduced in the slurry was lower than the pore volume of the tape. Beyond this limit, grain separation occurred, which induced a decrease in material density. Mechanical properties of tapes, in particular the maximum strength and the rupture elongation, were strongly influenced by the organic phase concentration. Variations in these properties were dependent on the level of filling of the tape porosity by the organic phase.