Nuestros investigadores

In this paper, we present a low-complexity coding strategy to encode (compress) finite-length data blocks of Gaussian vector sources. We show that for large enough data blocks of a Gaussian asymptotically wide sense stationary (AWSS) vector source, the rate of the coding strategy tends to the lowest possible rate. Besides being a low-complexity strategy it does not require the knowledge of the correlation matrix of such data blocks. We also show that this coding strategy is appropriate to encode the most relevant Gaussian vector sources, namely, wide sense stationary (WSS), moving average (MA), autoregressive (AR), and ARMA vector sources.

In this paper, we give upper bounds for the rate-distortion function (RDF) of any Gaussian vector, and we propose coding strategies to achieve such bounds. We use these strategies to reduce the computational complexity of coding Gaussian asymptotically wide sense stationary (AWSS) autoregressive (AR) sources. Furthermore, we also give sufficient conditions for AR processes to be AWSS.

In this paper, we present upper bounds for the rate distortion function (RDF) of finite-length data blocks of Gaussian wide sense stationary (WSS) sources and we propose coding strategies to achieve such bounds. In order to obtain those bounds, we previously derive new results on the discrete Fourier transform (DFT) of WSS processes.

Using some recent results on asymptotically equivalent sequences of matrices, we present in this paper, a new derivation of the capacity formula given by Brandenburg and Wyner for a discrete-time Gaussian multiple-input-multiple-output channel with memory. In this paper, we tackle not only the case considered by them, where the number of channel inputs and the number of channel outputs are the same, but also when both numbers are different.

This study focuses on how innovation capability can be developed within a company and how information capability is integrated into the innovation process. Innovation, helped by elements that generate and share knowledge, is generated through different practices. Thus, the present study develops an analysis of the role of information capability in innovation through the assessment of the direct experiences of managers from innovative companies located in Spain through grounded theory methodology. Our findings suggest that strategy promotes the appropriate culture and values that are aligned with innovation in the company. Strategy also establishes and acquires the resources, both internal and external, that an organization needs in order to achieve competiveness through innovation. Moreover, the organizational culture and resources support the information capability, and this information capability in turn supports the knowledge management which supports and develops innovation. The contribution of this research is the proposal of a framework that explains the elements that underlie innovation management in companies. The paper contributes to a deeper understanding of how to use information capability and knowledge management as potential sources of innovation.

In this paper, we obtain an eigenvalue decomposition for any complex skew-persymmetric anti-tridiagonal Hankel matrix where the eigenvector matrix is orthogonal.

Introduction. The aim of this study is to obtain deeper knowledge about the information practices and competences that evidence information capability in a company. The first objective of this study is to define a set of practices that can be implemented in order to develop information capability in a company and to explore the common underlying dimensions of these practices, that is, the information competences. The second is to explore which information competences can be expected to have a greater influence on the quality of the information managed. Method. Our target population for the study was companies committed to total quality management models because those models are information-intensive management systems. Data was collected with a questionnaire designed to elicit information regarding information practices. Forty-six companies that have applied the European framework for quality management excellence model were respondents to the survey. Analysis. Quantitative analyses with the support of the Minitab software package were carried out on the data. More specifically we performed an exploratory factor analysis and a multiple regression analysis to achieve the objectives of the study. Results. Main findings reveal eighteen information-related practices that can be pooled in 6 information competences that make up information capability. Key information competences which would most affect information quality are also found. Conclusion. The competences identified by this study are presented in other literature as being equally important to business performance; however just three of these competences have a significant influence on the quality of information managed.

El objetivo de este estudio es analizar si la gestión y el uso de la información es eficiente en empresas comprometidas con la gestión de la calidad y si depende del sistema de gestión de calidad adoptado por la organización. A partir de una revisión bibliográfica hemos establecido un conjunto de buenas prácticas que conducen a la gestión y el uso eficiente de la información en la organización. A continuación, usando un cuestionario, hemos recogido la percepción de los directivos sobre el nivel de adopción de las prácticas establecidas. Los directivos pertenecían a dos tipos de organizaciones: empresas que han adoptado la ISO9000 como sistema de gestión de calidad y empresas que han adoptado el modelo EFQM de calidad total. El estudio contribuye a lograr un conocimiento más profundo de la gestión y uso eficiente de la información como fuente de ventaja competitiva para la organización. El nivel de adopción de las prácticas que conducen a la gestión y uso eficiente de la información es elevado en las organizaciones comprometidas con la gestión de la calidad. Además se han detectado diferencias que dependen del sistema de calidad adoptado por la misma. Los datos se han obtenido de muestras pequeñas de empresas de diferentes regiones del mundo. Por otro lado, sólo se han tenido en cuenta dos sistemas de calidad

This study considers the effect of the usage of a social network site (www.grouply.com) for a class related group project on the development of individual abilities and performance in group work. Data were collected from three sections of an intermediate macroeconomic class at a Spanish university and groups were randomly assigned to work (or not) using the social network. Findings suggest that, although students are in general attracted by the idea of using SNS in class-related team work, the introduction of a tool they are not familiar with may hamper their self-perceived level of competence in a number of skills.

In the turbulent global environment in which organizations now compete, having reliable, accurate and readily available information is a key factor. Information is a strategic company resource. To the extent that TQM is an information-intensive management model, it is not unreasonable to assume that companies committed to TQM models should be efficient when managing information. This study has two main objectives. First, we aim to explore whether the information managed by companies committed to TQM models (in particular a quality management system based on the ISO 9000 international quality standards series) meets the dimensions required for information quality. Second, we aim to explore how information quality dimensions influence information consumers¿ overall feeling of being well informed in those companies. Using a quantitative approach, we used a questionnaire survey to capture the perceptions of managers in companies committed to a quality management system based on the ISO 9000 international quality standards series with respect to the information they managed. More specifically we applied a nonparametric test and performed a multiple regression analysis to address the objectives of the study. The analysis shows evidence that the information managed already meets many dimensions of information quality among the companies analysed.