DIEGO AGUIRRE - Academia.edu (original) (raw)

Papers by DIEGO AGUIRRE

In this work, the control system and fault detection algorithm applied on a real fatigue assay ma... more In this work, the control system and fault detection algorithm applied on a real fatigue assay machine is addressed. The objective of the machine is to apply periodical forces to restored teeth and to detect the teeth collapse calculating the number of cycles until the fault occurs. There is a Scottish yoke mechanism that converts the torque of a brushless motor on linear forces. This motor is driven by a power drive that receives the torque reference from a computer operating on real-time, and where the fault detection algorithm is applied. There is also a user computer where the parameters of the assay are introduced and where the results are shown. In this work the control system that has been implemented is shown in detail and the developed fault algorithm with adaptive threshold for the system with several sampling times is addressed.

In this work, we study the behaviour of the Bidirectional Associative Memory (BAM) in terms of th... more In this work, we study the behaviour of the Bidirectional Associative Memory (BAM) in terms of the supporting neural structure, with a view to its possible improvements as a useful Pattern Classifier by means of class associations from unknown inputs, once mentioned classes have been previously defined by one or even more prototypes. The best results have been obtained by suitably choosing the training pattern pairs, the thresholds, and the activation functions of the network's neurones, by means of certain proposed methods described in the paper. In order to put forward the advantages of these proposed methods, the classifier has been applied on an especially popular hand-written character set as the well-known NIST#19 character database, and with one of the UCI's data bases. In all cases, the method led to a marked improvement in the performance achievable by a BAM, with a 0% error rate.

Physics Letters B, 2011

This Letter reports on a first measurement of the inclusive W+jetsW+jets cross section in proton–... more This Letter reports on a first measurement of the inclusive W+jetsW+jets cross section in proton–proton collisions at a centre-of-mass energy of 7 TeV at the LHC, with the ATLAS detector. Cross sections, in both the electron and muon decay modes of the W -boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections σ(W+⩾n)/σ(W+⩾n−1)σ(W+⩾n)/σ(W+⩾n−1) for inclusive jet multiplicities n=1–4n=1–4. The results, based on an integrated luminosity of 1.3 pb−11.3 pb−1, have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics. The measured cross sections are compared to particle-level predictions based on perturbative QCD. Next-to-leading order calculations, studied here for n⩽2n⩽2, are found in good agreement with the data. Leading-order multiparton event generators, normalized to the NNLO total cross section, describe the data well for all measured jet multiplicities.

Neural Processing Letters, 2003

We present a form of attaining success levels of up to 100% in character classification by the ap... more We present a form of attaining success levels of up to 100% in character classification by the appropriate use of thresholds in the activity functions of the neurons making up the two-layer network with which bidirectional associative memories are implemented, together with a systematic method for generating the weight matrix. The system that is constructed includes a geometrical pre-processing stage that eliminates distortions, thereby improving the results. As a final characteristic, the functioning of the system presents a high level of immunity to noise or deformations. The system was evaluated using the two popular databases NIST#19 and UCI. There was found to be no misclassification in any case, whether under conditions of heavy contamination from noise or distortion of the image to be classified.

Ameloblastoma is a benign rare tumor, originated in the odontogenic epithelium, is locally invasi... more Ameloblastoma is a benign rare tumor, originated in the odontogenic epithelium, is locally invasive and with high tendency to local recurrence, a variety less common is the malignant or metastasizing ameloblastoma, where more frequent sites of deployment are the lung and cervical lymph nodes, being much less frequent sites the liver and skull among others. The surgical treatment is mainly the aggressive surgery of the primary tumor and metastases. We present a case of a patient with malignant mandibular ameloblastoma with metastases in liver and lung, which was subjected to a subtotal mandibulectomy, local radiotherapy and lung and liver metastasectomy in a second time, with late recurrence of the lesion.

European Physical Journal C, 2011

Measurements of luminosity obtained using the ATLAS detector during early running of the Large Ha... more Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at √ s = 7 TeV are presented. The luminosity is independently determined using several detectors and multiple algorithms, each having different acceptances, systematic uncertainties and sensitivity to background. The ratios of the luminosities obtained from these methods are monitored as a function of time and of μ, the average number of inelastic interactions per bunch crossing. Residual time-and μ-dependence between the methods is less than 2% for 0 < μ < 2.5. Absolute luminosity calibrations, performed using beam separation scans, have a common systematic uncertainty of ±11%, dominated by the measurement of the LHC beam currents. After calibration, the luminosities obtained from the different methods differ by at most ±2%. The visible cross sections measured using the beam scans are compared to predictions obtained with the PYTHIA and PHOJET event generators and the ATLAS detector simulation.

... Gabi Scheler (1994). 3 readers Save reference to library · Related research. Adaptive Nearest... more ... Gabi Scheler (1994). 3 readers Save reference to library · Related research. Adaptive Nearest Neighbour Pattern Classification. S Geva, J Sitte in Transaction on Neural Networks (1991). 1 reader Save reference to library · Related research. ...

European Physical Journal C, 2012

Enfermedades Infecciosas Y Microbiologia Clinica, 2004

Clinical significance of Streptococcus agalactiae isolation from urine samples of outpatients fro... more Clinical significance of Streptococcus agalactiae isolation from urine samples of outpatients from health care centers INTRODUCTION. Streptococcus agalactiae is a w ell-recognized pathogen in the obstetric population and is a cause of invasive infection in adults w ith underlying diseases. Nevertheless, the role of S. agalactiae in urinary tract infections in the adult non-pregnant population treated in outpatient health care centers has been less extensively studied. METHODS. The clinical significance of S. agalactiae isolation in urine samples from health care center patients w as studied in five areas of Spain over a period of six months. The study protocol included the collection of personal, epidemiological and clinical data. A total of 85 patients w ere studied; 79 w ere w omen (17 pregnant) and 6 men. RESULTS. Pyuria w as found in 72.9% of the cases. A total of 26.4% (n ‫؍‬ 18) of non-pregnant w omen and all the men had some type of chronic underlying disease and 35.3% (n ‫؍‬ 24) had urinary disease. Among the pregnant w omen, 53% had asymptomatic bacteriuria and 35.3% had vaginal and/ or urethral colonization. Among the group of men and non-pregnant w omen, the most frequent entity w as non-complicated cystitis, seen in 66.1% (45 of 68) of cases, follow ed by complicated infection in 19.1% and asymptomatic bacteriuria in 11.8%. Of the 45 patients w ith non-complicated cystitis, 35 (77.7%) w ere over 40 years old and 19 (42.2%) w ere over 60 years old. CONCLUSIONS. Among the population of non-pregnant adults treated in outpatient health care centers, S. agalactiae isolation from urine w as found mainly in w omen over 40 years old and w as the cause of non-complicated urinary tract infection in more than half of cases.

Oecologia, 2010

Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fru... more Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fruit availability as well as the movement and abundance of frugivores. These deleterious impacts may also interact with each other at diVerent spatial scales, leading to nonlinear eVects of fruit abundance on seed dispersal. In this study we assessed whether the degradation and fragmentation of southern Chilean forests had the potential to restrict seed dispersal the lingue (Persea lingue) tree, a Xeshy-fruited tree species. Of Wve frugivore bird species, the austral thrush (Turdus falcklandii) and the Wre-eyed diucon (Xolmis pyrope) were the only legitimate seed dispersers as well as being the most abundant species visiting lingue trees. The results showed little or no direct eVect of habitat fragmentation on seed dispersal estimates, possibly because the assemblage of frugivore birds was comprised habitatgeneralist species. Instead, the number of fruits removed per focal tree exhibited an enhanced response to crop size, but only in the more connected fragments. In the fruitricher fragment networks, there was an increased fragmentsize eVect on the proportion of fruits removed in comparison to fruit-poor networks in which the fragment size eVect was spurious. We suggest that such nonlinear eVects are widespread in fragmented forest regions, resulting from the link between the spatial scales over which frugivores sample resources and the spatial heterogeneity in fruiting resources caused by habitat fragmentation and degradation.

Oecologia, 2010

Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fru... more Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fruit availability as well as the movement and abundance of frugivores. These deleterious impacts may also interact with each other at diVerent spatial scales, leading to nonlinear eVects of fruit abundance on seed dispersal. In this study we assessed whether the degradation and fragmentation of southern Chilean forests had the potential to restrict seed dispersal the lingue (Persea lingue) tree, a Xeshy-fruited tree species. Of Wve frugivore bird species, the austral thrush (Turdus falcklandii) and the Wre-eyed diucon (Xolmis pyrope) were the only legitimate seed dispersers as well as being the most abundant species visiting lingue trees. The results showed little or no direct eVect of habitat fragmentation on seed dispersal estimates, possibly because the assemblage of frugivore birds was comprised habitatgeneralist species. Instead, the number of fruits removed per focal tree exhibited an enhanced response to crop size, but only in the more connected fragments. In the fruitricher fragment networks, there was an increased fragmentsize eVect on the proportion of fruits removed in comparison to fruit-poor networks in which the fragment size eVect was spurious. We suggest that such nonlinear eVects are widespread in fragmented forest regions, resulting from the link between the spatial scales over which frugivores sample resources and the spatial heterogeneity in fruiting resources caused by habitat fragmentation and degradation.

In this work, the control system and fault detection algorithm applied on a real fatigue assay ma... more In this work, the control system and fault detection algorithm applied on a real fatigue assay machine is addressed. The objective of the machine is to apply periodical forces to restored teeth and to detect the teeth collapse calculating the number of cycles until the fault occurs. There is a Scottish yoke mechanism that converts the torque of a brushless motor on linear forces. This motor is driven by a power drive that receives the torque reference from a computer operating on real-time, and where the fault detection algorithm is applied. There is also a user computer where the parameters of the assay are introduced and where the results are shown. In this work the control system that has been implemented is shown in detail and the developed fault algorithm with adaptive threshold for the system with several sampling times is addressed.

In this work, we study the behaviour of the Bidirectional Associative Memory (BAM) in terms of th... more In this work, we study the behaviour of the Bidirectional Associative Memory (BAM) in terms of the supporting neural structure, with a view to its possible improvements as a useful Pattern Classifier by means of class associations from unknown inputs, once mentioned classes have been previously defined by one or even more prototypes. The best results have been obtained by suitably choosing the training pattern pairs, the thresholds, and the activation functions of the network's neurones, by means of certain proposed methods described in the paper. In order to put forward the advantages of these proposed methods, the classifier has been applied on an especially popular hand-written character set as the well-known NIST#19 character database, and with one of the UCI's data bases. In all cases, the method led to a marked improvement in the performance achievable by a BAM, with a 0% error rate.

Physics Letters B, 2011

This Letter reports on a first measurement of the inclusive W+jetsW+jets cross section in proton–... more This Letter reports on a first measurement of the inclusive W+jetsW+jets cross section in proton–proton collisions at a centre-of-mass energy of 7 TeV at the LHC, with the ATLAS detector. Cross sections, in both the electron and muon decay modes of the W -boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections σ(W+⩾n)/σ(W+⩾n−1)σ(W+⩾n)/σ(W+⩾n−1) for inclusive jet multiplicities n=1–4n=1–4. The results, based on an integrated luminosity of 1.3 pb−11.3 pb−1, have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics. The measured cross sections are compared to particle-level predictions based on perturbative QCD. Next-to-leading order calculations, studied here for n⩽2n⩽2, are found in good agreement with the data. Leading-order multiparton event generators, normalized to the NNLO total cross section, describe the data well for all measured jet multiplicities.

Neural Processing Letters, 2003

We present a form of attaining success levels of up to 100% in character classification by the ap... more We present a form of attaining success levels of up to 100% in character classification by the appropriate use of thresholds in the activity functions of the neurons making up the two-layer network with which bidirectional associative memories are implemented, together with a systematic method for generating the weight matrix. The system that is constructed includes a geometrical pre-processing stage that eliminates distortions, thereby improving the results. As a final characteristic, the functioning of the system presents a high level of immunity to noise or deformations. The system was evaluated using the two popular databases NIST#19 and UCI. There was found to be no misclassification in any case, whether under conditions of heavy contamination from noise or distortion of the image to be classified.

Ameloblastoma is a benign rare tumor, originated in the odontogenic epithelium, is locally invasi... more Ameloblastoma is a benign rare tumor, originated in the odontogenic epithelium, is locally invasive and with high tendency to local recurrence, a variety less common is the malignant or metastasizing ameloblastoma, where more frequent sites of deployment are the lung and cervical lymph nodes, being much less frequent sites the liver and skull among others. The surgical treatment is mainly the aggressive surgery of the primary tumor and metastases. We present a case of a patient with malignant mandibular ameloblastoma with metastases in liver and lung, which was subjected to a subtotal mandibulectomy, local radiotherapy and lung and liver metastasectomy in a second time, with late recurrence of the lesion.

European Physical Journal C, 2011

Measurements of luminosity obtained using the ATLAS detector during early running of the Large Ha... more Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at √ s = 7 TeV are presented. The luminosity is independently determined using several detectors and multiple algorithms, each having different acceptances, systematic uncertainties and sensitivity to background. The ratios of the luminosities obtained from these methods are monitored as a function of time and of μ, the average number of inelastic interactions per bunch crossing. Residual time-and μ-dependence between the methods is less than 2% for 0 < μ < 2.5. Absolute luminosity calibrations, performed using beam separation scans, have a common systematic uncertainty of ±11%, dominated by the measurement of the LHC beam currents. After calibration, the luminosities obtained from the different methods differ by at most ±2%. The visible cross sections measured using the beam scans are compared to predictions obtained with the PYTHIA and PHOJET event generators and the ATLAS detector simulation.

... Gabi Scheler (1994). 3 readers Save reference to library · Related research. Adaptive Nearest... more ... Gabi Scheler (1994). 3 readers Save reference to library · Related research. Adaptive Nearest Neighbour Pattern Classification. S Geva, J Sitte in Transaction on Neural Networks (1991). 1 reader Save reference to library · Related research. ...

European Physical Journal C, 2012

Enfermedades Infecciosas Y Microbiologia Clinica, 2004

Clinical significance of Streptococcus agalactiae isolation from urine samples of outpatients fro... more Clinical significance of Streptococcus agalactiae isolation from urine samples of outpatients from health care centers INTRODUCTION. Streptococcus agalactiae is a w ell-recognized pathogen in the obstetric population and is a cause of invasive infection in adults w ith underlying diseases. Nevertheless, the role of S. agalactiae in urinary tract infections in the adult non-pregnant population treated in outpatient health care centers has been less extensively studied. METHODS. The clinical significance of S. agalactiae isolation in urine samples from health care center patients w as studied in five areas of Spain over a period of six months. The study protocol included the collection of personal, epidemiological and clinical data. A total of 85 patients w ere studied; 79 w ere w omen (17 pregnant) and 6 men. RESULTS. Pyuria w as found in 72.9% of the cases. A total of 26.4% (n ‫؍‬ 18) of non-pregnant w omen and all the men had some type of chronic underlying disease and 35.3% (n ‫؍‬ 24) had urinary disease. Among the pregnant w omen, 53% had asymptomatic bacteriuria and 35.3% had vaginal and/ or urethral colonization. Among the group of men and non-pregnant w omen, the most frequent entity w as non-complicated cystitis, seen in 66.1% (45 of 68) of cases, follow ed by complicated infection in 19.1% and asymptomatic bacteriuria in 11.8%. Of the 45 patients w ith non-complicated cystitis, 35 (77.7%) w ere over 40 years old and 19 (42.2%) w ere over 60 years old. CONCLUSIONS. Among the population of non-pregnant adults treated in outpatient health care centers, S. agalactiae isolation from urine w as found mainly in w omen over 40 years old and w as the cause of non-complicated urinary tract infection in more than half of cases.

Oecologia, 2010

Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fru... more Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fruit availability as well as the movement and abundance of frugivores. These deleterious impacts may also interact with each other at diVerent spatial scales, leading to nonlinear eVects of fruit abundance on seed dispersal. In this study we assessed whether the degradation and fragmentation of southern Chilean forests had the potential to restrict seed dispersal the lingue (Persea lingue) tree, a Xeshy-fruited tree species. Of Wve frugivore bird species, the austral thrush (Turdus falcklandii) and the Wre-eyed diucon (Xolmis pyrope) were the only legitimate seed dispersers as well as being the most abundant species visiting lingue trees. The results showed little or no direct eVect of habitat fragmentation on seed dispersal estimates, possibly because the assemblage of frugivore birds was comprised habitatgeneralist species. Instead, the number of fruits removed per focal tree exhibited an enhanced response to crop size, but only in the more connected fragments. In the fruitricher fragment networks, there was an increased fragmentsize eVect on the proportion of fruits removed in comparison to fruit-poor networks in which the fragment size eVect was spurious. We suggest that such nonlinear eVects are widespread in fragmented forest regions, resulting from the link between the spatial scales over which frugivores sample resources and the spatial heterogeneity in fruiting resources caused by habitat fragmentation and degradation.

Oecologia, 2010

Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fru... more Habitat degradation and fragmentation are expected to reduce seed dispersal rates by reducing fruit availability as well as the movement and abundance of frugivores. These deleterious impacts may also interact with each other at diVerent spatial scales, leading to nonlinear eVects of fruit abundance on seed dispersal. In this study we assessed whether the degradation and fragmentation of southern Chilean forests had the potential to restrict seed dispersal the lingue (Persea lingue) tree, a Xeshy-fruited tree species. Of Wve frugivore bird species, the austral thrush (Turdus falcklandii) and the Wre-eyed diucon (Xolmis pyrope) were the only legitimate seed dispersers as well as being the most abundant species visiting lingue trees. The results showed little or no direct eVect of habitat fragmentation on seed dispersal estimates, possibly because the assemblage of frugivore birds was comprised habitatgeneralist species. Instead, the number of fruits removed per focal tree exhibited an enhanced response to crop size, but only in the more connected fragments. In the fruitricher fragment networks, there was an increased fragmentsize eVect on the proportion of fruits removed in comparison to fruit-poor networks in which the fragment size eVect was spurious. We suggest that such nonlinear eVects are widespread in fragmented forest regions, resulting from the link between the spatial scales over which frugivores sample resources and the spatial heterogeneity in fruiting resources caused by habitat fragmentation and degradation.