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3 Papers

OVERVIEW OF COMPUTER-ASSISTED LANGUAGE LEARNING FOR EUROPEAN PORTUGUESE AT L2F

Topics: Web-Based Learning, Wikis and Blogs; e-Learning Platforms, Portals; Technology Enhanced Learning

Authors: Thomas Pellegrini ¹ , Wang Ling ² , André Silva ¹ , Rui Correia ² , Isabel Trancoso ³ , Jorge Baptista ⁴ and Nuno Mamede ³

Affiliations: ¹ Instituto de Engenharia de Sistemas e Computadores - Investigação e Desenvolvimento, Portugal , ² Instituto de Engenharia de Sistemas e Computadores - Investigação e Desenvolvimento, Instituto Superior Técnico and Carneggie Mellon University, Portugal , ³ Instituto de Engenharia de Sistemas e Computadores - Investigação e Desenvolvimento and Instituto Superior Técnico, Portugal , ⁴ Universidade do Algarve, Portugal

Digital Object Identifier: 10.5220/0003921505380543

Proceedings of SGoCSL 2012/CSEDU, ISBN: 978-989-8565-07-5

Quick Abstract

In this paper, we give an overview of our research in Computer-Assisted Language Learning for European Portuguese, to show how our long-time experience in spoken language processing allowed to propose multimedia documents as learning material. Beside a reading activity module that provides learners with individualized readings from a digital libray, Web-based serious game were introduced to cover aspects of listening, reading, and writing skills. One fundamental aspect of all our tools remains in the fully-automatic generation of the curriculum. This is very valuable for teachers, saving them time in search for motivating materials of appropriate quality, level and topic. A Web portal was recently created to make all our tools publicly available at http://call.l2f.inesc-id.pt/reap.public.

Related Ontology Subjects/Areas/Topics (9)

Computer-Supported Education	Information Technologies Supporting Learning	Technology Enhanced Learning
e-Learning	Simulation and Modeling	Ubiquitous Learning
e-Learning Platforms	Simulation Tools and Platforms	Web-Based Learning, Wikis and Blogs

SUFFIX ARRAYS - A Competitive Choice for Fast Lempel-Ziv Compressions

Topics: Joint Source/Channel Coding; Multiple Description Coding

Authors: Artur J. Ferreira ¹ , Arlindo L. Oliveira ² and Mário A. T. Figueiredo ³

Affiliations: ¹ Instituto Superior de Engenharia de Lisboa; Instituto de Telecomunicações, Portugal , ² Instituto de Engenharia de Sistemas e Computadores: Investigação e Desenvolvimento; Instituto Superior Técnico, Portugal , ³ Instituto de Telecomunicações; Instituto Superior Técnico, Portugal

Digital Object Identifier: 10.5220/0001935200050012

Proceedings of SIGMAP 2008/ICETE, ISBN: 978-989-8111-60-9

Quick Abstract

Lossless compression algorithms of the Lempel-Ziv (LZ) family are widely used in a variety of applications. The LZ encoder and decoder exhibit a high asymmetry, regarding time and memory requirements, with the former being much more demanding. Several techniques have been used to speed up the encoding process; among them is the use of suffix trees. In this paper, we explore the use of a simple data structure, named suffix array, to hold the dictionary of the LZ encoder, and propose an algorithm to search the dictionary. A comparison with the suffix tree based LZ encoder is carried out, showing that the compression ratios are roughly the same. The ammount of memory required by the suffix array is fixed, being much lower than the variable memory requirements of the suffix tree encoder, which depends on the text to encode. We conclude that suffix arrays are a very interesting option regarding the tradeoff between time, memory, and compression ratio, when compared with suffix trees, that make them preferable in some compression scenarios.

Related Ontology Subjects/Areas/Topics (5)

Joint Source/Channel Coding		Multimedia and Communications		Telecommunications
Multimedia		Multiple Description Coding

MODULAR PRODUCTION OF RICH DIGITAL TALKING BOOKS

Topics: Internet HCI: Web Interfaces and Usability; Multimedia Systems; Accessibility to Disabled Users

Authors: Luís Carriço ¹ , Carlos Duarte ¹ , Nuno Guimara˜es ¹ , António Serralheiro ² and Isabel Trancoso ²

Affiliations: ¹ Faculty of Sciences, University of Lisbon, Portugal , ² L2F INESC-ID, Portugal

Digital Object Identifier: 10.5220/0002643901580163

Proceedings of ICEIS 2004, ISBN: 972-8865-00-7

Quick Abstract

This paper presents a framework for automatic production of rich Digital Talking Books (DTB). The production process converts existing audio tapes and OCR-based digitalization of text books into full-fledged, multiple synchronized, multimodal digital books. The framework deals with the content organization processes and User Interface definition. The first one identifies content units and its relations. The latter, based on abstract, yet DTB specific, pattern-based UI specifications, allows the definition of various forms of interaction and presentation, required by the diversity and constraints of targets users (e.g. visually impaired persons) and situations of use (e.g. learning). The framework also permits to balance the complexity and flexibility of the generated DTBs, in order to cope with the resources provided on the different execution platform.

Related Ontology Subjects/Areas/Topics (7)

Accessibility to Disabled Users	Human-Computer Interaction	Multimedia Systems
Computer-Supported Education	Internet HCI: Web Interfaces and Usability	Ubiquitous Learning
Enterprise Information Systems

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