CONATEL 2011Pub Date : 2011-05-17DOI: 10.1109/CONATEL.2011.5958665
M. Reis, M. Bacelar, Maria G. A. D. Reis, D. Meira, M. Bessa, Emanuel Peres, R. Morais, António Valente, S. Soares, J. Bulas-Cruz
{"title":"Internet-based collaborative E-exercisebook system for primary math teaching","authors":"M. Reis, M. Bacelar, Maria G. A. D. Reis, D. Meira, M. Bessa, Emanuel Peres, R. Morais, António Valente, S. Soares, J. Bulas-Cruz","doi":"10.1109/CONATEL.2011.5958665","DOIUrl":"https://doi.org/10.1109/CONATEL.2011.5958665","url":null,"abstract":"The academic performance and social competence of a child in school is positively associated with the involvement of their parents. However, the researches about educational learning models often ignore the parents' part. Internet opens a new paradigm: education and communication approach is more complex than ever. Here, we would like to present an Internet based system to support students' homework. We believe that one of the major advantages of our system is time saving, particularly from the teacher's point of view. Also, this system gathers statistical data concerning different groups of students selected by the teacher. From these data on, the teacher can easily see where the students are having problems and decide what to do next. From the student (or parent) point of view, the prompt feedback about the exercises correctness, added to the training with different exercises sets about the same subject, besides the utilization of video, color, sound, etc., that positively reinforce child's senses, are elected as the main advantages.","PeriodicalId":197632,"journal":{"name":"CONATEL 2011","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133855716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CONATEL 2011Pub Date : 2011-05-17DOI: 10.1109/CONATEL.2011.5958670
C. R. da Silveira, D. M. Pataca, M. de Lacerda Rocha, M. Romero
{"title":"Performance analysis of modulation formats for 40 Gb/s optical transmission","authors":"C. R. da Silveira, D. M. Pataca, M. de Lacerda Rocha, M. Romero","doi":"10.1109/CONATEL.2011.5958670","DOIUrl":"https://doi.org/10.1109/CONATEL.2011.5958670","url":null,"abstract":"In this paper different optical modulation formats at 40 Gb/s are theoretically evaluated under three transmission constraints: spectral narrowing due to filter cascading, chromatic dispersion and self-phase modulation. After a cost estimation for each format, multi-line rates and/or multiple format schemes for optical network capacity upgrade are proposed.","PeriodicalId":197632,"journal":{"name":"CONATEL 2011","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133692891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CONATEL 2011Pub Date : 2011-05-01DOI: 10.1109/CONATEL.2011.5958666
Ana Belén Mejía-Ocaña, Manuel de-Frutos-López, S. Sanz-Rodriguez, Oscar del-Ama-Esteban, Carmen Peláez-Moreno, F. Díaz-de-María
{"title":"Low-complexity motion-based saliency map estimation for perceptual video coding","authors":"Ana Belén Mejía-Ocaña, Manuel de-Frutos-López, S. Sanz-Rodriguez, Oscar del-Ama-Esteban, Carmen Peláez-Moreno, F. Díaz-de-María","doi":"10.1109/CONATEL.2011.5958666","DOIUrl":"https://doi.org/10.1109/CONATEL.2011.5958666","url":null,"abstract":"In this paper, a low-complexity motion-based saliency map estimation method for perceptual video coding is proposed. The method employs a camera motion compensated vector map computed by means of a hierarchical motion estimation (HME) procedure and a Restricted Affine Transformation (RAT)-based modeling of the camera motion. To allow for a computationally efficient solution, the number of layers of the HME has been restricted and the potential unreliable motion vectors due to homogeneous regions have been detected and specially managed by means of a smooth block detector. Special care has been taken of the smoothness of the resulting compensated camera motion vector map to avoid unpleasant artifacts in the perceptually-coded sequence, by including a final post-processing based on morphological filtering. The proposed saliency map has been both visually and subjectively assessed showing quality improvements when used as a part of the H.264/AVC standard codec at medium-to-low bitrates.","PeriodicalId":197632,"journal":{"name":"CONATEL 2011","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120879704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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