Browsing by Issue Date, starting with "1999-09"
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- Multimedia kiosks and the ancient times: an archaeological reconstruction and history of Braga’s CathedralPublication . Bernardes, Paulo; Fontes, Luís; Marcos, AdéritoThe Multimedia Lab. of the UAUM, the CCG/ZGDV, and the Dept. of Information Systems of the University of Minho at Guimarães, joined forces to develop the prototype of a Multimedia Kiosk that operates as an information pool concerning the history of the Braga's Cathedral based on the data of the archaeological excavation.
- Convergence to equilibria of solutions to the coagulation-fragmentation equationsPublication . Costa, Fernando Pestana daThe Coagulation-Fragmentation equations are a model for the dynamics of cluster growth and consist of a countable number of non-locally coupled ordinary differential equations, modelling the concentration of the various clusters. The framework for the study of these equations is to see them as a nonlinear ODE in an appropriate infinite dimensional Banach space. A number of results about existence, uniqueness, density conservation, and asymptotic behaviour of solutions have been obtained in recent years. In the present paper we review some of the more recent results on the asymptotic behaviour of solutions as time tends to infinity. We pay special attention to the different behaviour of solutions in the weak-star and in the strong topologies of the phase space. This distinction can be interpreted in terms of a dynamic phase transition in the physical system modelled by the equations. It is shown that a balance between the relative strength of coagulation and fragmentation is crucial for that distinct behaviour to take place.
- Courseware for telework and trainingPublication . Marcos, Adérito; Grave, Luís; Bund, Jürgen; Ferreira, Rosa; Freitas, AntónioThis article reports on a CCG's project which aimet at developing an interactive course on telework issues, focusing especially on technology, solutions, strategies and recommendations for its integration in daily life. This follows a growing demand coming from companies that start to see telework and the ICTs as valuable tools for cutting costs and improving their organization and work processes. Thus, the target audience of this course are IT professionals and SMEs.
- ExventShop: o comércio electrónico nas exposições virtuaisPublication . Marcos, Adérito; Bund, Jürgen; Grave, Luís; Cardoso, Benjamim; Ferreira, Rosa; Ismael, KennedyEm anos recentes, a proliferação de conceitos e modelos do chamado Comércio Electrónico (CE), tem levado ao aparecimento de várias soluções informáticas que visam a sua implementação em concreto. Estas cobrem um extenso leque que vai desde a simples Loja na Internet até aos métodos de pagamento on-line envolvendo algoritmos de codificação mais ou menos complexos. Este artigo leva a cabo uma discussão alargada das potencialidades do CE, apresentando um protótipo de sistema focando especialmente a perspectiva da sua integração em ambientes de Exposição Virtual na World Wide Web (Web). Aqui não se trata apenas de implementar uma única Loja na Internet, mas sim de conceber os modelos de dados, interacção e interfaces genéricos, tendo em conta os problemas da logística e o grande número e necessidades de diferentes tipos de utilizadores envolvidos, tais como: organizadores da exposição ou feira, os expositores e os visitantes.