Nuestros investigadores

Marta de Zárraga Rodriguez

Departamento
Departamento de Ingeniería Biomédica y Ciencias
Escuela de Ingenieros (TECNUN). Universidad de Navarra
Líneas de investigación
Análisis Matricial con aplicaciones en Teoría de la Información y Procesado Estadístico de Señales, la Computación Distribuida, la Optimización y la Algoritmia.
Índice H
2, (WoS, 11/04/2019)
6, (Google Scholar, 11/04/2019)
3, (Scopus, 11/04/2019)

Publicaciones científicas más recientes (desde 2010)

Autores: Zárraga-Rodríguez, M.; Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Insausti, Xabier;
Revista: ENTROPY
ISSN 1099-4300  Vol. 21  Nº 10  2019  págs. 965
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.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Villar-Rosety, F. M.; Zárraga-Rodríguez, M.; et al.
Revista: IEEE COMMUNICATIONS LETTERS
ISSN 1089-7798  Vol. 23  Nº 5  2019  págs. 773 - 776
In this letter, we give a low-complexity analog linear coding scheme for transmitting finite-length data blocks of asymptotically wide sense stationary (AWSS) autoregressive (AR) sources through additive white Gaussian noise (AWGN) channels.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Zárraga-Rodríguez, M.; Villar-Rosety, F. M.; et al.
Revista: ENTROPY
ISSN 1099-4300  Vol. 20  Nº 6  2018 
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.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Zárraga-Rodríguez, M.; Insausti, Xabier;
Revista: SENSORS
ISSN 1424-8220  Vol. 18  Nº 4  2018 
In this paper, we compare six known linear distributed average consensus algorithms on a sensor network in terms of convergence time (and therefore, in terms of the number of transmissions required). The selected network topologies for the analysis (comparison) are the cycle and the path. Specifically, in the present paper, we compute closed-form expressions for the convergence time of four known deterministic algorithms and closed-form bounds for the convergence time of two known randomized algorithms on cycles and paths. Moreover, we also compute a closed-form expression for the convergence time of the fastest deterministic algorithm considered on grids.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Zárraga-Rodríguez, M.; Crespo, Pedro M.; et al.
Revista: ENTROPY
ISSN 1099-4300  Vol. 20  Nº 9  2018  págs. 719
Autores: Insausti, Xabier; Crespo, Pedro M.; Gutiérrez-Gutiérrez, Jesús; et al.
Revista: IEEE COMMUNICATIONS LETTERS
ISSN 1089-7798  Vol. 22  Nº 9  2018  págs. 1754 - 1757
In this letter, we design a low-latency, low-complexity, and low-transmission power analog linear coding scheme to estimate the finite-length data blocks under a mean-square-error (distortion) criterion. The proposed scheme is based on the analog linear coding and the discrete Fourier transform. A remarkable feature of our scheme is that it does not require knowing the correlation matrix of the data blocks, and therefore, it can be used even if the correlation matrix changes slowly with time.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Zárraga-Rodríguez, M.; Insausti, Xabier;
Revista: ENTROPY
ISSN 1099-4300  Vol. 19  Nº 554  2017 
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.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Zárraga-Rodríguez, M.; Insausti, Xabier; et al.
Revista: ENTROPY
ISSN 1099-4300  Vol. 19  Nº 95  2017 
In the present paper, we obtain a result on the rate-distortion function (RDF) of wide sense stationary (WSS) vector processes that allows us to reduce the complexity of coding those processes. To achieve this result, we propose a sequence of block circulant matrices. In addition, we use the proposed sequence to reduce the complexity of filtering WSS vector processes.
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Crespo, Pedro M.; Zárraga-Rodríguez, M.; et al.
Revista: IEEE TRANSACTIONS ON INFORMATION THEORY
ISSN 0018-9448  Vol. 63  Nº 9  2017  págs. 6000 - 6003
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.
Autores: Insausti, Xabier, (Autor de correspondencia); Gutiérrez-Gutiérrez, Jesús; Zárraga-Rodríguez, M.; et al.
Revista: SENSORS
ISSN 1424-8220  Vol. 17  Nº 1702  2017 
In a network, a distributed consensus algorithm is fully characterized by its weighting matrix. Although there exist numerical methods for obtaining the optimal weighting matrix, we have not found an in-network implementation of any of these methods that works for all network topologies. In this paper, we propose an in-network algorithm for finding such an optimal weighting matrix.
Autores: Jaca, Carmen, (Autor de correspondencia); Zárraga-Rodríguez, M.; Viles, Elisabeth; et al.
Revista: REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN 1988-7116  Vol. 10  Nº 1  2016  págs. 66 - 81
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.
Autores: Jaca, Carmen; Viles, Elisabeth; Zárraga-Rodríguez, M.;
Revista: MEMORIA INVESTIGACIONES EN INGENIERIA
ISSN 2301-1092  Nº 14  2016  págs. 23 - 34
El trabajo en equipo es una de las competencias clave para el desarrollo de muchos profesionales, más si cabe, para el de los futuros ingenieros. Es por ello que dicha competencia se debe definir primeramente en los planes de estudios de estas titulaciones como posteriormente debe controlarse y asegurarse la adquisición de la misma por parte de los alumnos. El artículo que aquí se presenta propone un modelo que sirve de referencia para entender los factores y procesos que surgen del desarrollo del trabajo en equipo y lo completa con la definición de unas herramientas que sirve para evaluar el grado de consecución de la competencia por parte de los alumnos a lo largo de un grado en ingeniería industrial. El modelo se ha probado en base a datos experimentales realizados en una escuela de ingenieros española, aunque está diseñado para que pueda adaptarse a cualquier nivel educativo en el que el trabajo en equipo sea definido como una competencia a desarrollar en el alumno.
Autores: Zárraga-Rodríguez, M.; Alvarez, M. J.;
Revista: THE TQM JOURNAL
ISSN 1754-2731  Vol. 28  Nº 6  2016  págs. 798 - 813
Autores: Gutiérrez-Gutiérrez, Jesús, (Autor de correspondencia); Zárraga-Rodríguez, M.;
Revista: APPLIED MATHEMATICS AND COMPUTATION
ISSN 0096-3003  Vol. 289  2016  págs. 214 - 219
In this paper we present a singular value decomposition for any n x n + 1 complex upper bidiagonal Toeplitz matrix.
Autores: Gutiérrez-Gutiérrez, Jesús; Zárraga-Rodríguez, M.;
Revista: SPECIAL MATRICES
ISSN 2300-7451  Vol. 4  Nº 1  2016  págs. 73-79
In this paper, we obtain an eigenvalue decomposition for any complex skew-persymmetric anti-tridiagonal Hankel matrix where the eigenvector matrix is orthogonal.
Autores: Jaca, Carmen; Zárraga-Rodríguez, M.; Viles, Elisabeth; et al.
Revista: REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN 1988-7116  Vol. 10  Nº 1  2016  págs. 66 - 81
Autores: Zárraga-Rodríguez, M.; Alvarez, M. J.;
Revista: INFORMATION RESEARCH
ISSN 1368-1613  Vol. 20  Nº 2  2015 
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.
Autores: Zárraga-Rodríguez, M.; Alvarez, M. J.;
Revista: INFORMATION RESEARCH
ISSN 1368-1613  Vol. 6  Nº 2-3  2015 
Information is a strategic company resource, but there is no consensus in the literature regarding the set of dimensions to be considered when measuring the quality of the information. Most measures of information quality depend on user perception. Using multiple correlation analysis, we obtain a model that allows us to explain how information quality dimensions influence information consumers¿ overall feeling of being well informed. A set of dimensions that any measure of information quality should at least include is proposed. This exploratory study reports the results of a research survey among managers of companies committed to quality management within the framework of a Total Quality Management (TQM) model, which is an information-intensive management model.
Autores: Zárraga-Rodríguez, M.; Jaca, Carmen; Viles, Elisabeth;
Revista: TEAM PERFORMANCE MANAGEMENT
ISSN 1352-7592  Vol. 21  Nº 5/6  2015  págs. 274 - 292
Autores: Zárraga-Rodríguez, M.; Alvarez, M. J.;
Revista: PROCEDIA: SOCIAL & BEHAVIORAL SCIENCES
ISSN 1877-0428  Vol. 109  Nº 8  2014  págs. 716 -721
Autores: Zárraga-Rodríguez, M.; Suarez, M.F.; Jaca, Carmen; et al.
Revista: REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN 1988-7116  Vol. 8  Nº 3  2014  págs. 33 - 44
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
Autores: Zárraga-Rodríguez, M., (Autor de correspondencia); Suárez-Barrraza, M.F.; Jaca, Carmen; et al.
Revista: REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN 1988-7116  Vol. 8  Nº 3  2014  págs. 33 -34
Explore the development of the information capability in companies committed to quality management and explore whether the development of information capability depends on the quality management system adopted by the company. The efficient use and management of information can be considered a capability for a company. From a review of the literature we first define information capability related practices. Then, through a questionnaire, we captured the perception of managers in two types of companies regarding the existence of information practices. We contacted companies that used ISO 9000 as their quality management system and companies that were committed to the EFQM excellence model. The paper contributes to a deeper understanding of the information capability construct. According to the results, companies committed to quality management have developed the information capability. Also, this study shows the differences in its development in terms of the quality system adopted by the company.The data has been obtained from small samples of companies from different regions in the world. Also other quality management systems could be considered.
Autores: Viles, Elisabeth; Zárraga-Rodríguez, M.; Jaca, Carmen;
Revista: INTANGIBLE CAPITAL
ISSN 1697-9818  Vol. 9  Nº 1  2013  págs. 281 - 304
Autores: Zárraga-Rodríguez, M.; Alvarez, M. J.;
Revista: TOTAL QUALITY MANAGEMENT AND BUSINESS EXCELLENCE
ISSN 1478-3363  Vol. 24  Nº 5-6  2013  págs. 539 - 560
Autores: Viles, Elisabeth; Zárraga-Rodríguez, M.; Jaca, Carmen;
Revista: INTANGIBLE CAPITAL
ISSN 1697-9818  Vol. 9  Nº 1  2013  págs. 281 - 304
Autores: Zárraga-Rodríguez, M.; Araluce, María del Mar; Erviti Ilundáin, M.C.;
Revista: INTANGIBLE CAPITAL
ISSN 1697-9818  Vol. 8  Nº 2  2012  págs. 181 - 215
Purpose: The aim of this study is to define the profile of the Management Assistant in organizations and from that profile establish the competences of a degree in Management Assistance under the new European Higher Education Area. Design/methodology: The first phase involved the collection of information from diverse sources (reports of associations, firms, international universities curricula, white books,¿). For the analysis of such information is used qualitative methodology, specifically the decision-making based on expert opinion obtained through group techniques. Findings: The study provides relevant evidences of the Management Assistant profile and defines the competences of a degree in Management Assistance. Research limitations/implications: The study is biased toward the point of view of academics. Practical implications: The data provided by the study may be useful for other Spanish universities interested in this profile and may serve as a basis for further studies to check profiles of support staff in organizations. Originality/value: The study helps to define the profile and the competences of the Management Assistant in the organizations.
Autores: Rodríguez, María Isabel; Lara, María Sonia; Zárraga-Rodríguez, M.; et al.
Revista: PROCEDIA: SOCIAL & BEHAVIORAL SCIENCES
ISSN 1877-0428  Vol. 47  2012  págs. 1616-1621
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.
Autores: Zárraga-Rodríguez, M.; Suarez, M.F.; Alvarez, M. J.; et al.
Libro:  ENGINEERING SYSTEMS AND NETWORKS
Vol. 28  2017  págs. 299 - 306
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.
Autores: Zárraga-Rodríguez, M.; Alvarez, M. J.;
Libro:  Managing Complexity
Vol. 109  2014  págs. 93 - 101
Autores: Zárraga-Rodríguez, M.; Araluce, María del Mar; Erviti Ilundáin, M.C.;
Libro:  Koleginiu studiju patrauklumo stiprinimas
2010  págs. 31 - 38

ACTIVIDAD DOCENTE

   
   

  OTROS MÉRITOS RELEVANTES

Marta de Zárraga es Ingeniero Industrial por la Universidad de Navarra (1993). Obtuvo un doctorado en Ingenierí­a Industrial (Área: Organización de Empresas) en 1999 y tiene la evaluación positiva de la ANECA en la figura de Profesora Contratada Doctora (Área: Organización de Empresas; Campo: Ciencias Económicas y Empresariales). En 2014 cambia su área de investigación. La nueva área es Matemática Aplicada siendo su lí­nea principal de investigación el análisis matricial con aplicaciones en Teorí­a de la Información y Procesado Estadístico de Señales. Comezó una segunda tesis doctoral (Área: Matemática Aplicada) que defendió en Julio de 2017. En relación a esta nueva á­nea de investigación ha publicado 10 artí­culos en revistas indexadas en JCR (1 en Q1 y 9 en Q2) y ha participado en 2 proyectos de investigación financiados por el Ministerio de Economí­a y Competitividad. En cuanto a docencia tiene impartidas más de 3.000 horas y actualmente es profesora de la Escuela Superior de Ingenieros de la Universidad de Navarra donde imparte las asignaturas de Matemáticas (calculo diferencial e integral para funciones de una variable real) y Matemáticas III (variable compleja y ecuaciones diferenciales). Pertenece al grupo de investigación Mathpicom (Principios matemáticos de la información y las comunicaciones) dentro del departamento de Ingeniería Biomédica y Ciencias de dicha Escuela.