A Broad Class of Discrete-Time Hypercomplex-Valued Hopfield Neural Networks

In this paper, we address the stability of a broad class of discrete-time hypercomplex-valued Hopfield-type neural networks. To ensure the neural networks belonging to this class always settle down at a stationary state, we introduce novel hypercomplex number systems referred to as real-part associative hypercomplex number systems. Real-part associative hypercomplex number systems generalize the well-known Cayley-Dickson algebras and real Clifford algebras and include the systems of real numbers, complex numbers, dual numbers, hyperbolic numbers, quaternions, tessarines, and octonions as particular instances. Apart from the novel hypercomplex number systems, we introduce a family of hypercomplex-valued activation functions called $\mathcal{B}$-projection functions. Broadly speaking, a $\mathcal{B}$-projection function projects the activation potential onto the set of all possible states of a hypercomplex-valued neuron. Using the theory presented in this paper, we confirm the stability analysis of several discrete-time hypercomplex-valued Hopfield-type neural networks from the literature. Moreover, we introduce and provide the stability analysis of a general class of Hopfield-type neural networks on Cayley-Dickson algebras

Equidad, cohesión y economía social

Economic deregulation has already caused tears in the social fabric threatening our social model. Once it is destroyed, as social cohesion is no longer a main objective of Policies, many people are in process of social exclusion, if not excluded, and neglected, increasing even more the inherited gap, created by an obsessive pursuit of profit. It is unlikely that politics will address these social injuries, consequence of placing the economy above all. Only solidarity flows within our societies will be able to act as a barrier to avoid the collapse of social equity. The engine of these flows is social economy; born out of solidarity can help building social cohesion while creating wealth.La economía desregulada ha dado muestras ya de desgarros sociales que van contra el modelo social. Destruido éste, al quedar en segundo plano la cohesión social como objetivo político, quedan las personas en procesos de exclusión social, si no ya excluidas, y con desatenciones que agrietan más aún, si cabe, la brecha heredada por un comportamiento obsesionado de búsqueda del beneficio. No será lo política quien se ocupe de estas heridas, al haber situado a la economía en el primer lugar. Solo actuarán de barrera frente al desmoronamiento de la equidad social los flujos solidarios existentes en la sociedad. Entre ellos, la economía social es un eje motor que nace de la solidaridad y construye cohesión social en la creación de riqueza

Catálogo de algas marinhas bentônicas do Estado da Bahia, Brasil

Catálogo de algas marinhas bentônicas do Estado da Bahia, Brasil. Totalizaram-se 258 táxons infragenéricos distribuídos em 145 Rhodophyta, 46 Phaeophyta e 67 Chlorophyta. Foram acrescidos ainda 35 novas citações para o litoral baiano

Duas Espécies de Rhodymenia (Rhodophyta, Rhodymeniaceae) no estado da Bahia, Brasil

Two species of Rhodymenia (Rhodophyta, Rhodymeniaceae) in the Bahia state, BrazilKey words. Rhodophyta, Rhodymeniaceae, Rhodymenia, Bahia.Palavras-chave. Rhodophyta, Rhodymeniaceae, Rhodymenia, Bahi

Alignment of Business Models and Software: Using an Architecture-Centric Method to the Case of a Healthcare Information System

The alignment of business issues with technological service-oriented solutions has proven to be a crucial aspect of modern business development. In this regard, the provision of methods to solve the gap between business and technology becomes absolutely necessary. This paper presents a proposal to systematize that leap by defining a development method centred on the concept of Architecture. The use of different architectural models at different levels of abstraction (along with the definition of model transformations between them) allows for the establishment of a trace between the business-level elements and software elements that are derived from them. Key benefits of our proposal are, on the one hand, the provision of a method for business-technology alignment and, on the other hand, the definition of a new model to represent the structure of a business. This proposal has been refined and validated using the case of an information system for the management of paediatric percentiles

WUVS Simulator: Detectability of spectral lines with the WSO-UV spectrographs

The World Space Observatory - Ultraviolet (WSO-UV) space telescope is equipped with high dispersion (55,000) spectrographs working in the 1150-3100 {\AA} spectral range. To evaluate the impact of the design on the scientific objectives of the mission, a simulation software tool has been developed. This simulator builds on the development made for the PLATO space mission, and it is designed to generate synthetic time-series of images by including models of all important noise sources. In this article, we describe its design and performance. Moreover, its application to the detectability of important spectral features for star formation and exoplanetary research is addressed.Comment: 8 pages, 5 figure

Migrating Traditional Web Applications to CMS-based Web Applications

AbstractIn recent years, Content Management Systems (CMS) have proven to be the best platforms for maintaining the large amount of digital content managed by Web applications. Thus, many organizations have experienced the necessity to base its Web applications on these CMS platforms. To do this, they start a migration process which is complex and error prone. To support this process, we propose a method based on the principles of Architecture-Driven Modernization (ADM) which automates the migration of Web applications to CMS-based Web applications. This article focuses on the implementation of two artifacts of this method: 1) the DSL ASTM_PHP, a modeling language for defining a model from PHP code (ASTM_PHP model) and 2) the model-to-model transformation rules which generate automatically a KDM model from a ASTM_PHP model. To show the feasibility of this implementation, we use a case study based on a widget implemented in PHP which lists the online users of a Web application

A Toolkit for ADM-based Migration: Moving from PHP Code to KDM Model in the Context of CMS-based Web Applications

In the last few years, many organizations have based their Web applications on Content Management Systems (CMS) because of the advantages they provide to manage their huge amount of digital content. The objectives of these organizations change, for this reason they may see the necessity of migrating their CMS-based Web applications to other CMS platforms meeting better their needs. Thus, we propose a method based on Architecture-Driven Modernization (ADM) to automate this migration process. In this paper we present the toolkit supporting this ADM-based migration method. For space restrictions, we focus on the implementation of two modules of this ADM-based toolkit: i) the ASTM_PHP DSL, a modeling language which allows to model the code of a system implemented in PHP (ASTM_PHP models) and ii) the model-to-model transformation rules which allow to generate KDM models from the information captured in the ASTM_PHP models. To show its usability, we present a case study where a widget listing online users of a CMS-based Web application is migrated from Drupal to Wordpress