Decimative Spectral Estimation with Unconstrained Model Order

This paper presents a new state-space method for spectral estimation that performs decimation by any factor, it makes use of the full set of data and brings further apart the poles under consideration, while imposing almost no constraints to the size of the Hankel matrix (model order), as decimation increases. It is compared against two previously proposed techniques for spectral estimation (along with derived decimative versions), that lie among the most promising methods in the field of spectroscopy, where accuracy of parameter estimation is of utmost importance. Moreover, it is compared against a state-of-the-art purely decimative method proposed in literature. Experiments performed on simulated NMR signals prove the new method to be more robust, especially for low signal-to-noise ratio

Multipurpose Design of Greek Sign Language Resources: A factor towards Universal Access

Abstract. In this paper we present the methodology of data collection and implementation of databases for the creation of extensive lexical and terminological resources for the Greek Sign Language (GSL) in order to introduce the major issue of dynamic sign representation. In respect to electronic linguistic resources of GSL, the focus is on issues of validation of linguistic content, multipurpose design and reusability of created resources, exemplified by the multimedia dictionary products of the projects NOEMA (1999-2001) and PROKLISI (2002-2004). In relation to sign representation, we discuss the use of video as a restricted means of reproducing linguistic content uttered in the three-dimensional space and present an attempt to use avatar and animation technologies, along with exploitation of electronic linguistic resources of the Greek Sign Language (GSL), in order to provide a dynamic device of generating unrestricted sign sequences. The aim is to set up a sign generation mechanism for the Greek Sign Language by means of a virtual human signer (avatar) that can be adaptable to various platforms. The overall emphasis is placed on exploitation of Universal Access and Design for All principles that allow proactive system architectures instead of a-posteriori adaptations.

Gesture and Sign Language in Human-Computer Interaction and Embodied Communication9th International Gesture Workshop, GW 2011, Athens, Greece, May 25-27, 2011, Revised Selected Papers /

XIV, 275 p. 122 illus.online resource

Sign Language Technologies and the Critical Role of SL Resources in View of Future Internet Accessibility Services

In this paper, we touch upon the requirement for accessibility via Sign Language as regards dynamic composition and exchange of new content in the context of natural language-based human interaction, and also the accessibility of web services and electronic content in written text by deaf and hard-of-hearing individuals. In this framework, one key issue remains the option for composition of signed “text„, along with the ability for the reuse of pre-existing signed “text„ by exploiting basic editing facilities similar to those available for written text that serve vocal language representation. An equally critical related issue is accessibility of vocal language text by born or early deaf signers, as well as the use of web-based facilities via Sign Language-supported interfaces, taking into account that the majority of native signers present limited reading skills. It is, thus, demonstrated how Sign Language technologies and resources may be integrated in human-centered applications, enabling web services and content accessibility in the education and an everyday communication context, in order to facilitate integration of signer populations in a societal environment that is strongly defined by smart life style conditions. This potential is also demonstrated by end-user-evaluation results