Detalle Profesor

Nuestros investigadores
Ignacio Rodríguez Carreño
Departamento
Economía
Facultad de Ciencias Económicas y Empresariales. Universidad de Navarra
Empresa
Facultad de Ciencias Económicas y Empresariales. Universidad de Navarra
Líneas de investigación
Digital EMG signal processing, econometrics, optimization applied to operations research, and machine learning techniques applied to urban economics.
Índice H
7, (WoS, 25/04/2022)
10, (Google Scholar, 25/04/2022)
Publicaciones científicas más recientes (desde 2010)
01
Autores: Martínez Compains, J., (Autor de correspondencia); Rodríguez Carreño, Ignacio; Gencay, R.; et al.
Revista: STUDIES IN NONLINEAR DYNAMICS AND ECONOMETRICS
ISSN   1081-1826  Vol.   25    5  2021  págs.   255 - 265
Johansen's Cointegration Test (JCT) performs remarkably well in finding stable bivariate cointegration relationships. Nonetheless, the JCT is not necessarily designed to detect such relationships in presence of non-linear patterns such as structural breaks or cycles that fall in the low frequency portion of the spectrum. Seasonal adjustment procedures might not detect such non-linear patterns, and thus, we expose the difficulty in identifying cointegrating relations under the traditional use of JCT. Within several Monte Carlo experiments, we show that wavelets can empower more the JCT framework than the traditional seasonal adjustment methodologies, allowing for identification of hidden cointegrating relationships. Moreover, we confirm these results using seasonally adjusted time series as US consumption and income, gross national product (GNP) and money supply M1 and GNP and M2.
02
Autores: Rodríguez Carreño, Ignacio (Autor de correspondencia); Malanda, A.; Gila Useros, L.; et al.
Revista: MEDICAL AND BIOLOGICAL ENGINEERING AND COMPUTING
ISSN   0140-0118  Vol.   58    3  2020  págs.   589 - 599
We present a new, automatic, correlation-based method for measuring the duration of motor unit action potentials (MUAPs). The method seeks to replicate the way an expert elctromyographer uses his or her eyes, calculating the start and end of the MUAP waveform on the basis of the degree of similarity of non-excluded discharges. We analysed 68 potentials from normal deltoid muscles during slight contraction. For each MUAP, two experienced electromyographers manually determined start and end marker positions, which were used as gold standard duration positions (GSP) in our subsequent tests. The novel method was compared with Nandedkar's method and a wavelet transform-based method. To compare the three methods, the differences between the automatic marker positions and GSPs were statistically evaluated using one-factor ANOVA, the estimated mean square error, and a Chi-square test on the numbers of automatic marker placements with gross errors. All these parameters showed smaller values for the novel method and in most of the cases were statistically significant. In addition, the parameters of the new method were subjected to a sensitivity study, showing its good performance within a range of clinically useful parameter values. The new automatic method determined start and end markers in a more accurate and reliable manner than both of the acknowledged state-of-the art methods used in our comparison study. The description of a new automatic duration measurement algorithm based on the similarity among discharges of the same MUAP. This method gave better results than the Nandedkar method and a highly regarded wavelet-based method. The new correlation-based method also had the lowest rate of gross aberrant errors in automatic placements
03
Autores: Redín Goñi, Dulce; Rodríguez Carreño, Ignacio; Cuñado Eizaguirre, Juncal; et al.
Revista: APPLIED ECONOMICS LETTERS
ISSN   1350-4851  Vol.   25    5  2018  págs.   305 - 308
This study examines the relationship between oil prices and economic activity in the G-7 economies during the period 1960M1¿2014M07 using a wavelet approach. The results show significant differences in the relationship between these two variables depending on the frequencies. Furthermore, we find that oil price shocks affect economic activity at low frequencies (long run) in all G-7 countries, while the effect at high frequencies (short run) is limited to a few countries.
04
Autores: Malanda-Trigueros, A., (Autor de correspondencia); Navallas, J. ; Rodriguez-Falces, J.; et al.
Revista: CLINICAL NEUROPHYSIOLOGY
ISSN   1388-2457  Vol.   129    6  2018  págs.   1170 - 1181
Objective: To evaluate the performance of a recently proposed motor unit action potential (MUAP) averaging method based on a sliding window, and compare it with relevant published methods in normal and pathological muscles. Methods: Three versions of the method (with different window lengths) were compared to three relevant published methods in terms of signal analysis-based merit figures and MUAP waveform parameters used in the clinical practice. 218 MUAP trains recorded from normal, myopathic, subacute neurogenic and chronic neurogenic muscles were analysed. Percentage scores of the cases in which the methods obtained the best performance or a performance not significantly worse than the best were computed. Results: For signal processing figures of merit, the three versions of the new method performed better (with scores of 100, 86.6 and 66.7%) than the other three methods (66.7, 25 and 0%, respectively). In terms of MUAP waveform parameters, the new method also performed better (100, 95.8 and 91.7%) than the other methods (83.3, 37.5 and 25%). Conclusions: For the types of normal and pathological muscle studied, the sliding window approach extracted more accurate and reliable MUAP curves than other existing methods. Significance: The new method can be of service in quantitative EMG. (C) 2018 International Federation of Clinical Neurophysiology. Published by Elsevier B.V.
05
Autores: Monge Moreno, Manuel Ángel; Gil Alaña, Luis Alberiko; Pérez de Gracia Hidalgo, Fernando (Autor de correspondencia); et al.
Revista: ENERGY SOURCES. PART B. ECONOMICS, PLANNING, AND POLICY
ISSN   1556-7249  Vol.   12    5  2017  págs.   420 - 427
This paper contributes to the literature on crude oil price behavior and examines how this affects mergers and acquisitions (M&A) in the petroleum industry in the US. The paper analyzes the relationship of these two series by studying its dynamic in the time¿frequency domain. The novelty of this study¿s approach lies in the application of wavelet tools for its resolution. Monthly data are used in this study, covering the period January 1980¿June 2012. It was observed that there was a shift to higher frequencies of the wavelet coherency during the mid-1990s and the late 2000s. The results also indicate that during the mid-1990s and the late-2000s, an increase in M&A took place that was led by the increase in West Texas Intermediate crude oil prices.
06
Autores: Beamurgia, M.; Basagoiti, R.; Rodríguez Carreño, Ignacio; et al.
Revista: SOFT COMPUTING
ISSN   1432-7643  Vol.   20    9  2016  págs.   3595 - 3609
Reduction of passenger waiting time in a multiple elevator system is an important goal in the lift industry. Genetic algorithms (GAs) have been applied to the dispatching problem in vertical transportation. In this paper, we present an approach based on a GA with several relevant adjustments to adapt this type of algorithm to this problem. The algorithm serves calls currently registered in the system to create a dispatch plan, under the assumption that just one passenger has made each call (i.e. without passenger forecasting). We develop and investigate various versions of the GA incorporating one or more adjustments in this research area. The algorithms were implemented and evaluated using ELEVATE, for two different building configurations, in terms of incoming, outgoing and interfloor profiles. To compare results, one-factor analysis of variance tests were applied to passenger waiting times. The performance of the basic GA was significantly improved upon by making these adjustments. These adjustments turn out to be essential for a successful implementation of a GA in the dispatching problem.
07
Autores: Malanda-Trigueros, A., (Autor de correspondencia); Rodríguez Carreño, Ignacio; Navallas-Irujo, J.; et al.
Revista: BIOMEDICAL SIGNAL PROCESSING AND CONTROL
ISSN   1746-8094  Vol.   27  2016  págs.   32 - 43
In quantitative electromyography (EMG), the set of potentials that constitute a motor unit action potential (MUAP) train are represented by a single waveform from which various parameters are determined in order to characterize the MUAP for diagnostic analysis. Several methods that extract such a waveform are currently available, and they are, in essence, based on two operations: averaging and selection, which are performed either sample-by-sample or on the whole-potential. We present a new approach that carries out selection and averaging on a local interval basis. We tested our algorithm with a dataset of MUAP records extracted from the tibialis anterioris muscle of healthy subjects and compared it with some of the most relevant state-of-the-art methods considered in a previous work (Malanda et al., J. Electromyogr. Kinesiol., 2015). The comparison covered general purpose signal processing figures of merit and clinically used MUAP waveform parameters. Significantly better results in both sets of figures of merit were obtained with the new approach. In addition, relative to the other algorithms tested, the new approach required fewer potentials from the MUAP set to obtain an accurate representative waveform.
08
Autores: Malanda, A.; Navallas, J.; Rodríguez-Falces, J.; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   25    4  2015  págs.   581-595
09
Autores: Elizalde Blasco, Javier; Kinateder, Markus; Rodríguez Carreño, Ignacio
Revista: EUROPEAN JOURNAL OF LAW AND ECONOMICS
ISSN   0929-1261  Vol.   40    1  2015  págs.   13 - 31
This work performs a comparative welfare analysis of two types of entry regulation in a duopolistic retail market: number of licenses and minimum distance between stores. In a linear (Hotelling) market we show that a minimum distance rule is beneficial for consumers and disadvantageous for the firms when demand is sufficiently inelastic. The distance rule that maximises social welfare is one quarter of the market under which firms will be located at the quartiles. Those locations are also optimal under regulated prices. Moreover, our model of two licenses with simultaneous entry is the first one that performs the horizontal product differentiation analysis using quadratic transportation costs and a binding reservation price. We find that a subgame perfect equilibrium exists for all the values of the reservation price and, for those values that induce a unique location equilibrium, the distance between the firms ranges from one half of the of the market to the whole market length.This analysis, which is not yet considered in the literature, is motivated by a change of entry regulation in the drugstore market in the Spanish region of Navarre. Since the demand in this market is quite inelastic, the minimum distance rule maybe socially more beneficial than the license rule.
10
Autores: Rodríguez, J.; Navallas, J.; Gila, L.; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   21    3  2011  págs.   423 - 432
In a series of previous works we studied the ratio between the amplitudes of the second and first phases (the peak-to-peak ratio) of single fibre action potential (SFAPs) using the Dimitrov¿Dimitrova SFAP convolutional model as a reference. From experimental potentials extracted from both healthy and diseased muscles, we determined typical peak-to-peak ratio (PPR) values and ranges for both normal and pathological conditions. In addition, we investigated the changes observed in the PPR of consecutive potentials recorded at different fibre-to-electrode distances. However, our results were not conclusive due to insufficient data. The objective of the present work was to obtain a more concrete description of the relation between PPR and radial distance. To this end, we recorded 135 sets of consecutive SFAPs from the m. tibialis anterior of four normal subjects. The needle was intentionally moved whilst recording each SFAP set. We found that PPR was largely independent of small changes in electrode position when the electrode was close to the fibre and sufficiently far from the neuromuscular and/or fibre¿tendon junctions. In the discussion, we provide evidence that this result is in agreement with the generation of extracellular potentials considering the spatial extension of the intracellular action potential (IAP) along the fibre.
11
Autores: Navallas-Irujo, J., (Autor de correspondencia); Malanda-Trigueros, A.; Gila-Useros, L.; et al.
Revista: MEDICAL AND BIOLOGICAL ENGINEERING AND COMPUTING
ISSN   0140-0118  Vol.   48  2010  págs.   875 - 886
The aim of this study was to develop a muscle architecture model able to account for the observed distributions of innervation ratios and fiber densities of different types of motor units in a muscle. A model algorithm is proposed and mathematically analyzed in order to obtain an inverse procedure that allows, by modification of input parameters, control over the output distributions of motor unit fiber densities. The model¿s performance was tested with independent data from a glycogen depletion study of the medial gastrocnemius of the rat. Results show that the model accurately reproduces the observed physiological distributions of innervation ratios and fiber densities and their relationships. The reliability and accuracy of the new muscle architecture model developed here can provide more accurate models for the simulation of different electromyographic signals.
12
Autores: Rodríguez-Falces, J.; Malanda-Trigueros, A.; Gila-Useros, L.; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   20    5  2010  págs.   868 - 878
In a previous work we studied the ratio between the amplitudes of the second and first phases (which we call PPR, after peak-to-peak ratio) of the single fibre action potential (SFAP) for a collection of fibrillation potentials (FPs) extracted from two pathological muscles. These FPs showed a wider PPR range than the Dimitrov¿Dimitrova (D¿D) convolutional model could provide. We proposed a modification of the D¿D intracellular action potential (IAP) in order to obtain a range of PPRs comparable to that observed in our FPs. This paper extends that study to a large number of SFAPs extracted from the tibialis anterior muscle of normal subjects. The estimation of the average PPR range of non-diseased muscles in non-fatigued conditions is important since it can be used as a reference to establish a comparison with PPR ranges from muscles suffering some disorder or from fibres that are fatigued. Other aspects of the PPR, as its sensitivity with volume conductor parameters or to what extent changes in the SFAP PPR reflects changes in IAP spatial profile are also examined. We found that the PPR of experimental SFAPs ranges from 0.3 to 2.5 in all subjects and that all PPR histograms contain a well-defined single peak around the PPR value 1.0.
13
Autores: Rodríguez-Falces, J., (Autor de correspondencia); Navallas-Irujo, J.; Gila-Useros, L.; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   20    6  2010  págs.   1249 - 1258
Using the core-conductor theory, a single fibre action potential (SFAP) can be expressed as the convolution of a biolectrical source and a weight function. In the Dimitrov¿Dimitrova (D¿D) SFAP convolutional model, the first temporal derivative of the intracellular action potential (IAP) is used as the source. The present work evaluates the relationship between the SFAP peak-to-peak amplitude (Vpp) and peak-to-peak interval (rise-time, RT) at different fibre-to-electrode distances using simulated signals obtained by the D¿D model as well as real recordings. With a single fibre electrode, we recorded 63 sets of consecutive SFAPs from the m. tibialis anterior of four normal subjects. The needle was intentionally moved whilst recording each SFAP set. We used the observed changes in RT and Vpp within each SFAP set as a point of reference with which to evaluate how closely the relationship between RT and Vpp provided by the D¿D model reflects real data. We found that half of the recorded SFAP sets had rise-times higher than those generated by the D¿D model. We also showed the influence of the IAP spatial length on the sensitivity of RT and Vpp with radial distance. The study reveals some inaccuracies in simulated SFAPs whose origin might be related to the assumptions made in the core-conductor theory.
14
Autores: Rodríguez Carreño, Ignacio; Gila Useros, Luis; Malanda Trigueros, Armando; et al.
Revista: CLINICAL NEUROPHYSIOLOGY
ISSN   1388-2457  Vol.   121    9  2010  págs.   1574 - 1583
To evaluate a recently published automatic duration method based on the wavelet transform applied on normal and pathological motor unit action potentials (MUAPs). Methods: We analyzed 313 EMG recordings from normal and pathological muscles during slight contractions. After the extraction procedure, 339 potentials were accepted for analysis: 68 from normal muscles, 124 from myopathic muscles, 20 from chronic neurogenic muscles, 83 from subacute neurogenic muscles and also 44 fibrillation potentials, as an example of very low duration muscular potentials. A ¿gold standard¿ of the duration positions (GSP) was obtained for each MUAP from the manual measurements of two senior electromyographists. The results of the novel method were compared to five well-known conventional automatic methods (CAMs). To compare the six methods, the differences between the automatic marker positions and the GSP for the start and end markers were calculated. Then, for the different groups of normal and pathological MUAPs, we applied: a one-factor ANOVA to compare their relative mean differences, the estimated mean square error (EMSE) and a Chi-square test about the rate of automatic marker placements with differences to the GSP greater than 5ms, taken as gross errors. Results: The mean and the standard deviation of the differences, the EMSE and the gross errors for the novel method were smaller than those observed with the CAMs in the five different MUAP groups and significantly different in most of the cases. Conclusions: The novel automatic duration method is more accurate than other available algorithms in normal and pathological MUAPs. Significance: Accurate MUAP duration automatic measurement is an important issue in daily clinical practice
15
Autores: Rodríguez Carreño, Ignacio; Gila-Useros, L.; Malanda-Trigueros, A.; et al.
Revista: CLINICAL NEUROPHYSIOLOGY
ISSN   1388-2457  Vol.   121    9  2010  págs.   1574 - 1583
16
Autores: Rodríguez-Falces, J., (Autor de correspondencia); Malanda-Trigueros, A.; Gila-Useros, L.; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   20    2  2010  págs.   264 - 273
The Dimitrov¿Dimitrova (D¿D) model generates a single fibre action potential (SFAP) as the convolution of an excitation function and a filter impulse function. We propose a method to estimate the parameters involved in these functions from a SFAP waveform (inverse problem) and call it Identification Procedure. The Identification Procedure comprises two parts. The present paper, Part I, is centred on the estimation of the radial distance, r, and the fibre diameter, d, of a given SFAP. To this end we develop a technique which we call the candidate pair method (CP-method), and we test it on fibrillation potentials (FPs) as experimental data. We found that the D¿D model cannot synthesize all the SFAP waveforms observed in the experimental recordings, but in the cases where it can, the CP-method then provides the values of r and d that are more likely to have synthesized the SFAP. Having a method that provides information about the fibre diameter straight from a SFAP waveform is very desirable as this parameter has clinical and physiological relevance. Moreover, the CP-method plays a major role in the Identification Procedure that is carried out in Part II.
17
Autores: Rodríguez-Falces, J., (Autor de correspondencia); Malanda-Trigueros, A.; Gila-Useros, L.; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   20    2  2010  págs.   274 - 283
The present paper describes a global procedure for estimating all the synthesis parameters that generate a single fibre action potential (SFAP) in the Dimitrov¿Dimitrova (D¿D) convolutional model. We call this inverse problem Identification Procedure, and it is presented in two parts, this paper being the second. The procedure incorporates the candidate pair (CP) method developed in Part I, which provides the values of radial distance r and fibre diameter d of the simulated SFAP that best matches a potential under study. The CP-method required prior knowledge of all the excitation parameters. However, since the Identification Procedure makes no assumption about the excitation, multiple combinations of the synthesis parameters result in very similar SFAPs whose shape is close the signal under study. Analysis of the possible combinations reveals that r and d can be modelled as two jointly Gaussian random variables. The interest of the Identification Procedure is that, for a certain SFAP, it provides estimates of r and d, along with estimates of different parameters that determine the IAP waveform. Moreover, the procedure is able to determine the degree of error that accompanies the estimation of r and d.
18
Autores: Gonzalez-Izala, M.; Malanda. A.; Rodríguez Carreño, Ignacio; et al.
Revista: JOURNAL OF BIOMECHANICS
ISSN   0021-9290  Vol.   43    13  2010  págs.   2589 - 2594
19
Autores: González Izal, Miriam; Rodríguez Carreño, Ignacio; Malanda Trigueros, Armando; et al.
Revista: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
ISSN   1050-6411  Vol.   20    6  2010  págs.   1097 - 1106
The purpose of this study was to investigate the sensitivity of new surface electromyography (sEMG) indices based on the discrete wavelet transform to estimate acute exercise-induced changes on muscle power output during a dynamic fatiguing protocol. Fifteen trained subjects performed five sets consisting of 10 leg press, with 2 min rest between sets. sEMG was recorded from vastus medialis (VM) muscle. Several surface electromyographic parameters were computed. These were: mean rectified voltage (MRV), median spectral frequency (F-med), Dimitrov spectral index of muscle fatigue (FInsm5), as well as five other parameters obtained from the stationary wavelet transform (SWT) as ratios between different scales. The new wavelet indices showed better accuracy to map changes in muscle power output during the fatiguing protocol. Moreover, the new wavelet indices as a single parameter predictor accounted for 46.6% of the performance variance of changes in muscle power and the log-FInsm5 and MRV as a two-factor combination predictor accounted for 49.8%. On the other hand, the new wavelet indices proposed, showed the highest robustness in presence of additive white Gaussian noise for different signal to noise ratios (SNRs). The sEMG wavelet indices proposed may be a useful tool to map changes in muscle power output during dynamic high-loading fatiguing task.
01
Autores: Rodríguez Carreño, Ignacio; Gila-Useros, L.; Malanda-Trigueros, A.;
Libro: Advances in clinical neurophysiology
2012  págs.   133 - 160
Actividad docente
   

Curso 2020 - 2021

- Trabajo Fin de Máster: Research Project (MEF). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Trabajo Fin de Grado (Empresa). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Trabajo Fin de Grado (Empresa). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Quantitative Methods II B_20 (F. Económicas). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Quantitative Methods II A_20 (F. Económicas). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Métodos Cuantitativos II_20 (F. Económicas). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

Curso 2019 - 2020

- Trabajo Fin de Máster: Research Project (MEF). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra B (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra C (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra C (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra A (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

Curso 2018 - 2019

- Mathematical Analysis for Economic Research (MEF). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Trabajo Fin de Grado (Empresa). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra B (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra A (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra C (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra B (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra C (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

Curso 2017 - 2018

- Mathematical Analysis for Economic Research (MEF). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Trabajo Fin de Grado (Empresa). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra B (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra C (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra C (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.

- Algebra B (F. ECONÓMICAS). Universidad de Navarra - Facultad de Ciencias Económicas y Empresariales.