Navegando por Data de Publicação, começando com "2013-10-22"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 3 de 3

Uma abordagem para migração automática de código no contexto do desenvolvimento orientado a modelos
(Universidade Federal de São Carlos, 2013-10-22) Possatto, Marcos Antonio; Lucrédio, Daniel; https://lattes.cnpq.br/9090396559596221; https://lattes.cnpq.br/3254940785475023
Code generators play a key role in model-driven software development. They are responsible for transforming high-level assets (models) into implementation assets (code). Most generators are based on templates, which are pieces of text instrumented with code expansion elements. They receive an input and produce an output according to the template's programming. To build such template-based generators, the code of an existing implementation, already tested and validated, can be used as a reference, in a process known as code migration. With software evolution and the need for changes in the code generator, the templates start to differ from this reference implementation. In order to restablish the synchronization, additional effort is required. Tackling the challenge of keeping these assets synchronized (reference implementation and templates) is this dissertation's subject. The goal is to provide some automation to the code migration process, even if partial, in order to increase productivity in the maintenance of code generators. A mechanism was developed to make it possible to automatically reproduce changes that are performed in the reference implementation into one or more code generation templates. This mechanism was evaluated through an empirical study, yielding good performance in a controlled environment. This indicates that automation can help to reduce the effort in the maintenance of code generators in a model-driven development context.
Estrutura de metacomunidades de peixes em uma microbacia da Mata Atlântica
(Universidade Federal de São Carlos, 2013-10-22) Almeida, Rodrigo da Silva; Cetra, Maurício; https://lattes.cnpq.br/6775493342513120; https://lattes.cnpq.br/4423449163037358; Christianini, Alexander Vicente; http://lattes.cnpq.br/2295622727813765; Ferreira, Fábio Cop; http://lattes.cnpq.br/3362658772296923
The concept of metacommunities incorporates the influence of local and regional factors in structuring communities and has supported recent approaches related to patterns of distribution, abundance and species interactions. Within this concept, the species sorting model that assumes that a community is governed only by local factors, while the mass effect model assumes that a community is governed by local and regional effects. A stream system has a hierarchical dendritic network, in which the upstream water bodies are smaller and tend to increase in the downstream direction due to the connection with other streams. To stream fish, the dispersion process by the channel reveals the importance of regional factors on the structure of metacommunities, while habitat heterogeneity acts locally, and may reveal boundaries between metacommunities. This study aims to determine whether there is the formation of metacommunities along the longitudinal gradient and models which explain this structure. We captured fish populations and raise environmental information in three streams (15 reaches of 70 m) of a small watershed of the Atlantic. A principal component analysis (PCA) was applied to describe the environmental gradient and to verify the occurrence of this metacommunities apply a gradient elements of metacommunities analysis (EMS). The pattern of distance decay relationships (DDR) was used to verify whether metacommunities are influenced by the effects of local and / or regional and so seek explanations for the pattern found. We can say that there are two distinct communities (clementsian pattern of metacommunities), one nearest the mouth with no defined pattern caused by a process mass effect and a more flush with standard board from a species sorting process. Distinguish these communities is of great interest to conservation purposes and the development of strategies for biomonitoring. For example, for communities downstream, where the environmental changes caused by urbanization are more prevalent and there is the possibility of removing this source of environmental impact, ensure connectivity of streams is a good strategy since the species moving more intensely and are very dependent on the source of colonization. On the other hand, communities further upstream, even if there is a disconnect with the region downstream promoted by the damming of streams for water harvesting, these communities will remain theoretically provided that local conditions are guaranteed, ie, there is a pressing conservation environmental integrity of these excerpts.
Avaliação das técnicas de segmentação, modelagem e classificação para o reconhecimento automático de gestos e proposta de uma solução para classificar gestos da libras em tempo real
(Universidade Federal de São Carlos, 2013-10-22) Anjo, Mauro dos Santos; Pizzolato, Ednaldo Brigante; https://lattes.cnpq.br/2821982735490884; https://lattes.cnpq.br/9114521946872957
Multimodal interfaces are becoming popular and trying to enhance user experience through the use of natural forms of interaction. Among these forms we have speech and gestures inputs. Speech recognition is already a common feature in our daily basis but gesture recognition has just now being widely used as a new form of interaction. The Brazilian Sign Language (Libras) was recently recognized as a legal way of communication since the Brazilian Government enacted the law N˚10.436 on 04/24/2002, and also has recently became an obligatory subject in teachers education and an elective subject in undergraduate courses through the enactment N˚5.626 on 12/22/2005. In this context, this dissertation presents a study of all the steps that are necessary to achieve a complete system to recognize Static and Dynamic gestures of Libras, being these steps: Segmentation; Modeling and Interpretation; and Classification. Results and proposed solutions will be presented for each one of these steps, and the system will be evaluated in the task of real-time recognition of static and dyamic gestures within a finite set of Libras gestures. All the solutions presented in this dissertation were embedded in the software GestureUI, in which the main goal is to simplify the research in the field of gesture recognition allowing the communication with multimodal interfaces through a TCP/IP protocol.