Revistas
Revista:
APPLIED MATHEMATICS AND COMPUTATION
ISSN:
0096-3003
Año:
2023
Vol.:
445
Págs.:
127824
As the correlation matrices of stationary vector processes are block Toeplitz, autoregressive (AR) vector processes are non-stationary. However, in the literature, an AR vector process of finite order is said to be stationary if it satisfies the so-called stationarity condition (i.e., if the spectral radius of the associated companion matrix is less than one). Since the term stationary is used for such an AR vector process, its correlation matrices should somehow approach the correlation matrices of a stationary vector process, but the meaning of somehow approach has not been mathematically established in the literature. In the present paper we give necessary and sufficient conditions for AR vector processes to be stationary. These conditions show in which sense the correlation matrices of an AR stationary vector process asymptotically behave like block Toeplitz matrices. Applications in information theory and in statistical signal processing of these necessary and sufficient conditions are also given.
Revista:
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
ISSN:
2332-7782
Año:
2022
Vol.:
8
N°:
4
Págs.:
4219 - 4228
Aircraft manufacturers aim to decrease the fuel consumption based on reducing weight and increasing the subsystem efficiency. Hence, the electric power system (EPS) acquires great relevance because it must be efficient and lightweight. Any change in the EPS must not affect the aircraft's electrical safety, which under a traditional decentralized EPS strategy is ensured by redundancy. Recently, several decentralized EPS strategies based on the introduction of multiport power converters have arisen. Such strategies meet the established safety goals since the aforementioned devices make it possible to recalculate the path to continue powering the loads in case of failure. However, the literature does not address how to connect such multiport power converters. The main contribution of this article is to present a low-complexity algorithm that minimizing the redundancy of wiring, provides a fault-tolerant power transmission network. This is done under a decentralized EPS strategy where multiport power converters are used. The proposed strategy is evaluated on Boeing 787 aircraft, where we compare the length of the cables both under a traditional decentralized network configuration (where the redundancy option is used to ensure the safety of operation) and in the network provided by our algorithm. A saving of 66.6% is obtained.
Revista:
ENTROPY
ISSN:
1099-4300
Año:
2022
Vol.:
24
N°:
5
Págs.:
669
In the era of the Internet of Things, there are many applications where numerous devices are deployed to acquire information and send it to analyse the data and make informed decisions. In these applications, the power consumption and price of the devices are often an issue. In this work, analog coding schemes are considered, so that an ADC is not needed, allowing the size and power consumption of the devices to be reduced. In addition, linear and DFT-based transmission schemes are proposed, so that the complexity of the operations involved is lowered, thus reducing the requirements in terms of processing capacity and the price of the hardware. The proposed schemes are proved to be asymptotically optimal among the linear ones for WSS, MA, AR and ARMA sources.
Revista:
ENERGIES
ISSN:
1996-1073
Año:
2021
Vol.:
14
N°:
12
Págs.:
3649
In this paper we propose a mathematical model for the fuel consumption analysis during aircraft cruise. A closed-form formula that expresses the aircraft's weight variation over time, and hence, the fuel flow rate, is obtained as a result. Furthermore, a closed-form expression of the aircraft's main performance parameters is also obtained. We compare the values of such parameters computed by using the Piano-X software and computed by using our mathematical model. Simulation results confirm that our mathematical model provides results very close to reality. Finally, the closed-form formula of the fuel flow rate provided by our model is used to improve the calculation of the carbon dioxide emissions for four example routes, which, unlike here, are usually obtained under the assumption of a constant value of the fuel flow rate.
Revista:
IEEE ACCESS
ISSN:
2169-3536
Año:
2021
Vol.:
9
Págs.:
160688 - 160696
The COVID-19 pandemic has had severe consequences on the global economy, mainly due to indiscriminate geographical lockdowns. Moreover, the digital tracking tools developed to survey the spread of the virus have generated serious privacy concerns. In this paper, we present an algorithm that adaptively groups individuals according to their social contacts and their risk level of severe illness from COVID-19, instead of geographical criteria. The algorithm is fully distributed and therefore, individuals do not know any information about the group they belong to. Thus, we present a distributed clustering algorithm for adaptive pandemic control.
Revista:
MATHEMATICS
ISSN:
2227-7390
Revista:
ENTROPY
ISSN:
1099-4300
Revista:
IEEE COMMUNICATIONS LETTERS
ISSN:
1089-7798
Año:
2019
Vol.:
23
Págs.:
773 - 776
Revista:
ENTROPY
ISSN:
1099-4300
Año:
2019
Vol.:
21
N°:
10
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.
Revista:
INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWORKS
ISSN:
1550-1477
Revista:
SENSORS
ISSN:
1424-8220
Revista:
IEEE COMMUNICATIONS LETTERS
ISSN:
1089-7798
Año:
2018
Vol.:
22
Págs.:
1754 - 1757
Revista:
ENTROPY
ISSN:
1099-4300
Revista:
ENTROPY
ISSN:
1099-4300
Revista:
IEEE TRANSACTIONS ON INFORMATION THEORY
ISSN:
0018-9448
Año:
2017
Vol.:
63
Págs.:
6000 - 6003
Revista:
SENSORS
ISSN:
1424-8220
Revista:
ENTROPY
ISSN:
1099-4300
Revista:
ENTROPY
ISSN:
1099-4300
Revista:
MEMORIA INVESTIGACIONES EN INGENIERIA
ISSN:
2301-1092
Año:
2016
N°:
14
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.
Revista:
THE TQM JOURNAL
ISSN:
1754-2731
Año:
2016
Vol.:
28
N°:
6
Págs.:
798 - 813
Revista:
REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN:
1988-7116
Año:
2016
Vol.:
10
N°:
1
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.
Revista:
SPECIAL MATRICES
ISSN:
2300-7451
Año:
2016
Vol.:
4
N°:
1
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.
Revista:
REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN:
1988-7116
Año:
2016
Vol.:
10
N°:
1
Págs.:
66 - 81
Revista:
APPLIED MATHEMATICS AND COMPUTATION
ISSN:
0096-3003
Año:
2016
Vol.:
289
Págs.:
214 - 219
Revista:
TEAM PERFORMANCE MANAGEMENT
ISSN:
1352-7592
Año:
2015
Vol.:
21
N°:
5/6
Págs.:
274 - 292
Revista:
ACM JOURNAL OF DATA AND INFORMATION QUALITY
ISSN:
1936-1955
Año:
2015
Vol.:
6
N°:
2-3
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.
Revista:
INFORMATION RESEARCH
ISSN:
1368-1613
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.
Revista:
PROCEDIA: SOCIAL & BEHAVIORAL SCIENCES
ISSN:
1877-0428
Año:
2014
Vol.:
109
N°:
8
Págs.:
716 -721
Revista:
REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN:
1988-7116
Año:
2014
Vol.:
8
N°:
3
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
Revista:
REVISTA GLOBALIZACION, COMPETITIVIDAD Y GOBERNABILIDAD
ISSN:
1988-7116
Año:
2014
Vol.:
8
N°:
3
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.
Revista:
INTANGIBLE CAPITAL
ISSN:
1697-9818
Año:
2013
Vol.:
9
N°:
1
Págs.:
281 - 304
Revista:
TOTAL QUALITY MANAGEMENT AND BUSINESS EXCELLENCE
ISSN:
1478-3363
Año:
2013
Vol.:
24
N°:
5-6
Págs.:
539 - 560
Revista:
INTANGIBLE CAPITAL
ISSN:
1697-9818
Año:
2013
Vol.:
9
N°:
1
Págs.:
281 - 304
Revista:
INTANGIBLE CAPITAL
ISSN:
1697-9818
Año:
2012
Vol.:
8
N°:
2
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.
Revista:
PROCEDIA: SOCIAL & BEHAVIORAL SCIENCES
ISSN:
1877-0428
Año:
2012
Vol.:
47
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.
Nacionales y Regionales
Título:
DECALOQC: Degenerate quantum error correction and theoretical limits of time-varying quantum channels
Código de expediente:
2021-CIEN-000077-02-01
Investigador principal:
Pedro Crespo Bofill
Financiador:
DIPUTACIÓN FORAL DE GIPUZKOA
Convocatoria:
Programa Red guipuzcoana de Ciencia, Tecnología e Innovación_DFG 2021
Fecha de inicio:
01/09/2021
Fecha fin:
30/09/2022
Importe concedido:
101.393,00€
Otros fondos:
-
Título:
Avances en codificación y procesado de la señal para la sociedad digital
Código de expediente:
PID2019-104958RB-C44
Financiador:
MINISTERIO DE CIENCIA E INNOVACIÓN
Convocatoria:
2019 AEI PROYECTOS I+D+i (incluye Generación del conocimiento y Retos investigación)
Fecha de inicio:
01/06/2020
Fecha fin:
31/01/2024
Importe concedido:
124.872,00€
Otros fondos:
-
Título:
Desarrollo de nuevas tecnologias y herramientas que aceleren la transicion a una produccion inteligente
Código de expediente:
KK-2020/00060
Investigador principal:
Xabier Insausti Sarasola
Financiador:
GOBIERNO VASCO
Convocatoria:
2020 GV Elkartek -Proyectos de apoyo a la investigacion colaborativa en areas estrategicas.Tipo 1.
Fecha de inicio:
01/04/2020
Fecha fin:
31/12/2021
Importe concedido:
116.322,00€
Otros fondos:
-
Título:
Control distribuido avanzado para la seguridad y la eficiencia energetica del transporte aereo
Código de expediente:
KK-2020/00044
Investigador principal:
Xabier Insausti Sarasola
Financiador:
GOBIERNO VASCO
Convocatoria:
2020 GV Elkartek -Proyectos de apoyo a la investigacion colaborativa en areas estrategicas.Tipo 1.
Fecha de inicio:
01/03/2020
Fecha fin:
31/12/2021
Importe concedido:
73.675,00€
Otros fondos:
-
Título:
Codificacion y procesado de señales para redes emergentes de comunicacion y de sensores inhalambricas
Código de expediente:
TEC2016-75067-C4-3-R
Investigador principal:
Pedro Crespo Bofill
Financiador:
MINISTERIO DE CIENCIA E INNOVACIÓN
Convocatoria:
2016 MINECO RETOS INVESTIGACION. PROYECTOS I+D+i
Fecha de inicio:
01/01/2017
Fecha fin:
31/12/2020
Importe concedido:
168.795,00€
Otros fondos:
-