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1. Association of hospital volume with conversion to open from minimally invasive colectomy in patients with diverticulitis: A national analysis

Author

Ebrahimian, Shayan, Verma, Arjun, Sakowitz, Sara, Olmedo, Manuel Orellana, Chervu, Nikhil, Khan, Aimal, Hawkins, Alexander, Benharash, Peyman, and Lee, Hanjoo

Subjects
Public Health, Health Sciences, Clinical Research, Patient Safety, Adult, Humans, Retrospective Studies, Diverticulitis, Diverticular Diseases, Colectomy, Minimally Invasive Surgical Procedures, Hospitals, Laparoscopy, Postoperative Complications, Treatment Outcome, General Science & Technology
Abstract

BackgroundDespite the known advantages of minimally invasive surgery (MIS) for diverticular disease, the impact of conversions to open (CtO) colectomy remains understudied. The present study used a nationally representative database to characterize risk factors and outcomes associated with CtO in patients with diverticular disease.MethodsAll elective adult hospitalizations entailing colectomy for diverticulitis were identified in the 2017-2019 Nationwide Readmissions Database. Annual institutional caseloads of MIS and open colectomy were independently tabulated. Restricted cubic splines were utilized to non-linearly estimate the risk-adjusted association between hospital volumes and CtO. Additional regression models were developed to evaluate the association of CtO with outcomes of interest.ResultsOf an estimated 110,281 patients with diverticulitis who met study criteria, 39.3% underwent planned open colectomy, 53.3% completed MIS, and 7.4% had a CtO. Following adjustment, an inverse relationship between hospital MIS volume and risk of CtO was observed. In contrast, increasing hospital open volume was positively associated with greater risk of CtO. On multivariable analysis, CtO was associated with lower odds of mortality (AOR 0.3, p = 0.001) when compared to open approach, and similar risk of mortality when compared to completed MIS (AOR 0.7, p = 0.436).ConclusionIn the present study, institutional MIS volume exhibited inverse correlation with adjusted rates of CtO, independent of open colectomy volume. CtO was associated with decreased rates of mortality compared to planned open approach but equivalence risk relative to completed MIS. Our findings highlight the importance of MIS experience and suggest that MIS may be safely pursued as the initial surgical approach among diverticulitis patients.

Published
2023

3. The GALEX View of 'Boyajian's Star' (KIC 8462852)

Author

Davenport, James. R. A., Covey, Kevin R., Clarke, Riley W., Laycock, Zachery, Fleming, Scott W., Boyajian, Tabetha S., Montet, Benjamin T., Shiao, Bernie, Million, Chase C., Wilson, David J., Olmedo, Manuel, Mamajek, Eric E., Olmedo, Daniel, Chavez, Miguel, and Bertone, Emanuele

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

The enigmatic star KIC 8462852, informally known as "Boyajian's Star", has exhibited unexplained variability from both short timescale (days) dimming events, and years-long fading in the Kepler mission. No single physical mechanism has successfully explained these observations to date. Here we investigate the ultraviolet variability of KIC 8462852 on a range of timescales using data from the GALEX mission that occurred contemporaneously with the Kepler mission. The wide wavelength baseline between the Kepler and GALEX data provides a unique constraint on the nature of the variability. Using 1600 seconds of photon-counting data from four GALEX visits spread over 70 days in 2011, we find no coherent NUV variability in the system on 10-100 second or months timescales. Comparing the integrated flux from these 2011 visits to the 2012 NUV flux published in the GALEX-CAUSE Kepler survey, we find a 3% decrease in brightness for KIC 8462852. We find this level of variability is significant, but not necessarily unusual for stars of similar spectral type in the GALEX data. This decrease coincides with the secular optical fading reported by Montet & Simon (2016). We find the multi-wavelength variability is somewhat inconsistent with typical interstellar dust absorption, but instead favors a R$_V$ = 5.0 $\pm$ 0.9 reddening law potentially from circumstellar dust., Comment: 8 pages, 4 figures, ApJ Accepted

Published
2017
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4. Deep GALEX UV Survey of the Kepler Field I: Point Source Catalog

Author

Olmedo, Manuel, Lloyd, James, Mamajek, Eric E., Chávez, Miguel, Bertone, Emanuele, Martin, D. Christopher, and Neill, James D.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We report observations of a deep near-ultraviolet (NUV) survey of the Kepler field made in 2012 with the Galaxy Evolution Explorer (GALEX) Complete All-Sky UV Survey Extension (CAUSE). The GALEX-CAUSE Kepler survey (GCK) covers 104 square degrees of the Kepler field and reaches limiting magnitude NUV=22.6 at 3{\sigma}. Analysis of the GCK survey has yielded a catalog of 669,928 NUV sources, of which 475,164 are cross-matched with stars in the Kepler Input Catalog (KIC). Approximately 327 of 451 confirmed exoplanet host stars and 2614 of 4696 candidate exoplanet host stars identified by Kepler have NUV photometry in the GCK survey. The GCK catalog should enable the identification and characterization of UV-excess stars in the Kepler field (young solar-type and low-mass stars, chromospherically active binaries, white dwarfs, horizontal branch stars, etc.), and elucidation of various astrophysics problems related to the stars and planetary systems in the Kepler field., Comment: Accepted for publication in ApJ. 10 pages, 10 figures

Published
2015
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5. Proposed Nomenclature for Surface Features on Pluto and Its Satellites and Names for Newly Discovered Satellites

Author

Mamajek, Eric E., Rapson, Valerie A., Cameron, David A., Olmedo, Manuel, Fogerty, Shane, Franklin, Eric, Lambrides, Erini, Hasan, Imran, Sarkis, Richard E., Thorndike, Stephen, and Nordhaus, Jason

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

In anticipation of the July 2015 flyby of the Pluto system by NASA's New Horizons mission, we propose naming conventions and example names for surface features on Pluto and its satellites (Charon, Nix, Hydra, Kerberos, Styx) and names for newly discovered satellites., Comment: 6 pages, white paper

Published
2015

6. Learning Sets of Bayesian Networks

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Moral, Serafín, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Lesot, Marie-Jeanne, editor, Vieira, Susana, editor, Reformat, Marek Z., editor, Carvalho, João Paulo, editor, Wilbik, Anna, editor, Bouchon-Meunier, Bernadette, editor, and Yager, Ronald R., editor

Published
2020
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7. Mg II h+k Flux - Rotational Period Correlation for G-type stars

Author

Olmedo, Manuel, Chávez, Miguel, Bertone, Emanuele, and De la Luz, Víctor

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

We present an analysis of the correlation between the mid-UV Mg II h and k emission lines and measured rotational periods of G-type stars. Based on IUE and HST high resolution spectra of a sample of 36 stars, we derive an exponential function that best represents the correlation. We found that the variation of the Mg II h + k fluxes is about a factor of 2.5 larger than that of Ca II H+K, indicating that the UV features are more sensitive to the decline of rotational period. The comparison of UV-predicted rotational periods with those derived from empirical Prot - Ca II H+K flux calibrations are consistent, with some scatter at large periods, where the emission are less intense. We present newly derived rotational periods for 15 G-type stars., Comment: 9 pages, 5 figures, 4 tables. Accepted for publication in PASP (corrected references)

Published
2013
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9. Virtual Subconcept Drift Detection in Discrete Data Using Probabilistic Graphical Models

Author

Cabañas, Rafael, Cano, Andrés, Gómez-Olmedo, Manuel, Masegosa, Andrés R., Moral, Serafín, Barbosa, Simone Diniz Junqueira, Series Editor, Chen, Phoebe, Series Editor, Filipe, Joaquim, Series Editor, Kotenko, Igor, Series Editor, Sivalingam, Krishna M., Series Editor, Washio, Takashi, Series Editor, Yuan, Junsong, Series Editor, Zhou, Lizhu, Series Editor, Medina, Jesús, editor, Ojeda-Aciego, Manuel, editor, Verdegay, José Luis, editor, Perfilieva, Irina, editor, Bouchon-Meunier, Bernadette, editor, and Yager, Ronald R., editor

Published
2018
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10. Estimating Conditional Probabilities by Mixtures of Low Order Conditional Distributions

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Moral, Serafín, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Moral, Serafín, editor, Pivert, Olivier, editor, Sánchez, Daniel, editor, and Marín, Nicolás, editor

Published
2017
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17. On SPI for Evaluating Influence Diagrams

Author

Cabañas, Rafael, Madsen, Anders L., Cano, Andrés, Gómez-Olmedo, Manuel, Junqueira Barbosa, Simone Diniz, editor, Chen, Phoebe, editor, Cuzzocrea, Alfredo, editor, Du, Xiaoyong, editor, Filipe, Joaquim, editor, Kara, Orhun, editor, Kotenko, Igor, editor, Sivalingam, Krishna M., editor, Ślęzak, Dominik, editor, Washio, Takashi, editor, Yang, Xiaokang, editor, Laurent, Anne, editor, Strauss, Olivier, editor, Bouchon-Meunier, Bernadette, editor, and Yager, Ronald R., editor

Published
2014
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18. Extended Probability Trees for Probabilistic Graphical Models

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Moral, Serafín, Pérez-Ariza, Cora B., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, Series editor, Tanaka, Yuzuru, Series editor, Wahlster, Wolfgang, Series editor, Siekmann, Jörg, Series editor, van der Gaag, Linda C., editor, and Feelders, Ad J., editor

Published
2014
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19. On SPI-Lazy Evaluation of Influence Diagrams

Author

Cabañas, Rafael, Cano, Andrés, Gómez-Olmedo, Manuel, Madsen, Anders L., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, Series editor, Tanaka, Yuzuru, Series editor, Wahlster, Wolfgang, Series editor, Siekmann, Jörg, Series editor, van der Gaag, Linda C., editor, and Feelders, Ad J., editor

Published
2014
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20. Learning Recursive Probability Trees from Data

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Moral, Serafín, Pérez-Ariza, Cora Beatriz, Salmerón, Antonio, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Bielza, Concha, editor, Salmerón, Antonio, editor, Alonso-Betanzos, Amparo, editor, Hidalgo, J. Ignacio, editor, Martínez, Luis, editor, Troncoso, Alicia, editor, Corchado, Emilio, editor, and Corchado, Juan M., editor

Published
2013
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21. Approximate Lazy Evaluation of Influence Diagrams

Author

Cabañas, Rafael, Cano, Andrés, Gómez-Olmedo, Manuel, Madsen, Anders L., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Bielza, Concha, editor, Salmerón, Antonio, editor, Alonso-Betanzos, Amparo, editor, Hidalgo, J. Ignacio, editor, Martínez, Luis, editor, Troncoso, Alicia, editor, Corchado, Emilio, editor, and Corchado, Juan M., editor

Published
2013
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22. Evaluating Asymmetric Decision Problems with Binary Constraint Trees

Author

Cabañas, Rafael, Gómez-Olmedo, Manuel, Cano, Andrés, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, and van der Gaag, Linda C., editor

Published
2013
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23. Locally Averaged Bayesian Dirichlet Metrics

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Masegosa, Andrés R., Moral, Serafín, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, and Liu, Weiru, editor

Published
2011
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25. Recursive Probability Trees for Bayesian Networks

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Moral, Serafín, Pérez-Ariza, Cora B., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Meseguer, Pedro, editor, Mandow, Lawrence, editor, and Gasca, Rafael M., editor

Published
2010
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26. Binary Probability Trees for Bayesian Networks Inference

Author

Cano, Andrés, Gómez-Olmedo, Manuel, Moral, Serafín, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Sossai, Claudio, editor, and Chemello, Gaetano, editor

Published
2009
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27. Decreasing rates of colectomy for benign neoplasms: A nationwide analysis.

Author

Sakowitz, Sara, Bakhtiyar, Syed Shahyan, Mallick, Saad, Khoraminejad, Baran, Olmedo, Manuel, Croman, Millicent, Benharash, Peyman, and Lee, Hanjoo

Subjects
BENIGN tumors, COLECTOMY, DIVERTICULITIS, COLON tumors, ENDOSCOPIC surgery, ARACHNOID cysts, INFLAMMATORY bowel diseases, INTESTINAL perforation
Abstract

Background: Despite advances in endoscopic techniques for management of benign colonic neoplasms, a rise in rates of surgical treatment has been reported. We used a nationally representative cohort to characterize temporal trends, patient characteristics, and outcomes associated with colectomy for colonic neoplasms. Methods: All patients undergoing elective partial colectomy for benign or malignant colonic neoplasms were identified using the 2012–2019 National Inpatient Sample. Those presenting with inflammatory bowel disease, or experiencing intestinal perforation were excluded. Patients with benign neoplasms were classified as the Benign cohort (others: Malignant). Trends, characteristics, and outcomes were assessed between groups. Results: Of 569,280 colectomy procedures included for analysis, 153,435 (27.0%) were performed for benign lesions. The proportion of Benign operations decreased from 28.6% in 2012 to 23.7% in 2019 (P for trend<0.001). While overall national incidence of colectomy for benign neoplasms decreased from 2012 to 2019 (IRD -1.19, 95%CI -1.20- -1.19), Black patients demonstrated an incremental increase (IRD +0.04, 95%CI +0.02–0.06). On average, Benign was younger (66 [57–72] vs 68 years [58–77], P<0.001), and demonstrated a lower Elixhauser comorbidity index (2 [1–3] vs 3 [2–4], P<0.001), relative to Malignancy. Following adjustment, Benign demonstrated lower odds of in-hospital mortality (AOR 0.61, 95%CI 0.50–0.74; P<0.001), stoma creation (AOR 0.46, 95%CI 0.43–0.50; P<0.001), and infectious complications (AOR 0.68, 95%CI 0.63–0.73; P<0.001). Conclusions: The present national study identifies a decrease in colectomy for benign polyps from 2012–2019. Future investigations should identify patients who would most benefit from surgical resection and address persistent inequities in access to screening and treatment for colonic neoplasms. [ABSTRACT FROM AUTHOR]

Published
2023
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32. Measurement of the Higgs Boson Properties at \sqrt s = 13 TeV With CMS in the \gamma \gamma Decay Channel

Author

Olmedo, Manuel Alejandro

Subjects
Particle physics, Boson, CMS, Higgs, LHC, Particle
Abstract

The decay of the Higgs boson to two photons is one of the major analysis channels for Higgs physics studied at the LHC. Together with the four-lepton decay channel, it provided the most statistically robust signal leading to the Higgs discovery in 2012. Although the particle has been extensively studied at 7 TeV and 8 TeV, research into higher collision energies (13 TeV) is necessary for further characterization. The two-photon collaboration in CMS has developed analysis tools to investigate these high-energy collision events. Important resultsare a measured signal strength of σobs/σtheoretical = 1.16+0.11−0.10 and a measured mass of mH=125.09 GeV with 9.3σ significance.

Published
2017

44. Long-term evaluation of energy efficiency measures in transport, case study Paraguay.

Author

Universidad Nacional de Asunción - Facultad Politécnica, Olmedo, Manuel, Ortigoza Moreno, Eduardo Adrián, Valdez, Diana, Ríos, Richard, Oxilia Dávalos, Victorio Enrique, Universidad Nacional de Asunción - Facultad Politécnica, Olmedo, Manuel, Ortigoza Moreno, Eduardo Adrián, Valdez, Diana, Ríos, Richard, and Oxilia Dávalos, Victorio Enrique

Abstract

Although Paraguay is one of the world's largest exporters of electrical energy, its energy matrix depends mainly on biomass and hydrocarbons, the latter being imported. Based on this, this study evaluated efficiency measures for the main final use of hydrocarbons identified, namely long-distance land transport of cargo. Long-term diesel and electric rail transport scenarios were studied using an energy model developed in the Long-range Energy Alternatives Planning soft ware and an energy, economic and environmental (related to emission savings) analysis was carried out. The results obtained show the great potential for eco nomic, energy and environmental savings with the application of measures to replace end-use technologies and primary energy source, in the long term, in all branches of energy demand.

Published
2020

45. Análisis de corrosión en tornillos protéticos para prótesis sobreimplantes Título (no escriba en mayúsculas) Dentales: Estudio de aislamiento y resistencia basado en nuevos materiales

Author

Martínez Olmedo, Manuel, Corpas Iglesias, Francisco Antonio, Iglesias Godino, Francisco Javier, and Universidad de Jaén. Departamento de INGENIERÍA QUIM.,AMBIENTAL Y DE LOS MAT.

Subjects
corrosion, corrosión, cavidad oral, implant abutment screw, oral cavity, nanoparticles, titanium, titanio, nanopartículas, tornillo protético
Abstract

RESUMEN: Introducción: La cavidad oral posee características de alta concentración de sales minerales, proteínas y células, capaces de modificar la integridad de la unidad implante dental-pilar-prótesis. La protección de los tornillos protéticos dentales frente al fenómeno de la corrosión y la mejora de sus características estructurales, son dos pilares sobre los que descansa el éxito de las restauraciones a largo plazo. El titanio y sus aleaciones lanzan al medio oral iones que no son perjudiciales para la salud, sin embargo gracias a la integridad de la capa de óxido inerte formada en su superficie soporta la corrosión. La alteración de dicha capa se manifiesta en lesiones de estriación por fatiga que causan la pérdida de la integridad del tornillos protético. Objetivos: Evaluar la calidad en el maquinado de los tornillos comerciales. Observar el comportamiento de los tornillos comerciales y experimentales al fenómeno de la corrosión. Determinar la acción inhibitoria de la corrosión de la adición superficial de nanopartículas de plata y cobre en nuestros modelos de tornillo experimental y su comportamiento en pruebas mecánicas. Material y método: Observación de tornillo protéticos comerciales de cinco marcas y características superficiales diferentes en SEM y EDS, tal como los distribuye el fabricante y tras someterlos a un proceso de corrosión en saliva artificial en cámara de temperatura constante de 36.5º. Mismo proceso de análisis, observación y corrosión en tornillos control y tornillos con recubrimientos experimentales en nanopartículas de Ag, Cu y Ag-Cu. Análisis de tracción en máquina universal de ensayos de tornillos control y experimentales. Análisis de AFM de tornillos experimentales. Resultados: Los defectos de manufacturación son notables en la zona de las espiras de los tornillos no recubiertos, presentando un mejor acabado los tornillos Nobel Biocare donde el micronálisis determino estar recubiertos de WC. El producto de corrosión se acumula en la zona de los valles debilitando estructuras y aumentando los microcracks preexistentes de la manufacturación. Las nanopartículas inhiben en parte la formación de producto de corrosión y por tanto la acidificación de la superficie del tornillo. Las pruebas mecánicas concluyeron que tras el fenómeno corrosivo las resistencia a la tensión no se modificaba por el uso de nanopartículas, sin embargo el módulo elástico en algunos casos superó el 50% en los tornillos experimentales frente al control. Sin embargo la elongación disminuyó hasta un 35%. Conclusiones: La calidad del maquinado de los tornillos protéticos comerciales es mejorable, especialmente los no recubiertos. El comportamiento frente a la corrosión mejora con los recubrimientos, también con los experimentales. El aumento del módulo elástico de los tornillos experimentales puede mejorar el comportamiento a largo plazo de los mismos. Tesis Univ. Jaén. Departamento de Ing. Química, Ambiental y de los Materiales. Leída el 16 de mayo de 2019.

Published
2019

46. TheGALEXView of “Boyajian’s Star” (KIC 8462852)

Author

Davenport, James. R. A., primary, Covey, Kevin R., additional, Clarke, Riley W., additional, Laycock, Zachery, additional, Fleming, Scott W., additional, Boyajian, Tabetha S., additional, Montet, Benjamin T., additional, Shiao, Bernie, additional, Million, Chase C., additional, Wilson, David J., additional, Olmedo, Manuel, additional, Mamajek, Eric E., additional, Olmedo, Daniel, additional, Chávez, Miguel, additional, and Bertone, Emanuele, additional

Published
2018
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47. Approximate Counting of Graphical Models Via MCMC Revisited

Author

Sonntag, Dag, Peña, Jose M., and Gómez-Olmedo, Manuel

Subjects
Lauritzen-Wermuth-Frydenberg interpretation, Computer and Information Sciences, Bayesian networks, Chain graphs, MCMC sampling, Multivariate regression interpretation, Data- och informationsvetenskap
Abstract

We apply MCMC sampling to approximately calculate some quantities, and discuss their implications for learning directed and acyclic graphs (DAGs) from data. Specifically, we calculate the approximate ratio of essential graphs (EGs) to DAGs for up to 31 nodes. Our ratios suggest that the average Markov equivalence class is small. We show that a large majority of the classes seem to have a size that is close to the average size. This suggests that one should not expect more than a moderate gain in efficiency when searching the space of EGs instead of the space of DAGs. We also calculate the approximate ratio of connected EGs to connected DAGs, of connected EGs to EGs, and of connected DAGs to DAGs. These new ratios are interesting because, as we will see, they suggest that some conjectures that appear in the literature do not hold. Furthermore, we prove that the latter ratio is asymptotically 1. Finally, we calculate the approximate ratio of EGs to largest chain graphs for up to 25 nodes. Our ratios suggest that Lauritzen-Wermuth-Frydenberg chain graphs are considerably more expressive than DAGs. We also report similar approximate ratios and conclusions for multivariate regression chain graphs. This work is funded by the Center for Industrial Information Technology (CENIIT) and a so-called career contract at Linkoping University, by the Swedish Research Council (ref. 2010-4808), and by FEDER funds and the Spanish Government (MICINN) through the projects TIN2010-20900-C04-03 and TIN2010-20900-C04-01.

Published
2015

48. Learning marginal AMP chain graphs under faithfulness revisited

Author

Pena, Jose M, Gomez-Olmedo, Manuel, Pena, Jose M, and Gomez-Olmedo, Manuel

Abstract

Marginal AMP chain graphs are a recently introduced family of models that is based on graphs that may have undirected, directed and bidirected edges. They unify and generalize the AMP and the multivariate regression interpretations of chain graphs. In this paper, we present a constraint based algorithm for learning a marginal AMP chain graph from a probability distribution which is faithful to it. We show that the marginal AMP chain graph returned by our algorithm is a distinguished member of its Markov equivalence class. We also show that our algorithm performs well in practice. Finally, we show that the extension of Meeks conjecture to marginal AMP chain graphs does not hold, which compromises the development of efficient and correct score+search learning algorithms under assumptions weaker than faithfulness. (C) 2015 Elsevier Inc. All rights reserved., Funding Agencies|Center for Industrial Information Technology [09.01]; Swedish Research Council [2010-4808]; Spanish Ministry of Economy and Competitiveness [TIN2013-46638-C3-2-P]; European Regional Development Fund (FEDER)

Published
2016
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50. Heuristics for determining the elimination ordering in the influence diagram evaluation with binary trees

Author

Cabañas, Rafael, Cano, Andrés, Gómez-Olmedo, Manuel, Madsen, Anders L., Jaeger, Manfred, Nielsen, Thomas Dyhre, and Viappiani, Paolo

Subjects
Variable elimination, Elimination ordering, Influence Diagrams, Heuristics, Binary trees
Abstract

Finding an optimal elimination ordering is a NP-hard problem of crucial importance for the efficiency of the Influence Diagrams evaluation. Some of the traditional methods for determining the elimination ordering use heuristics that consider that potentials are represented as tables. However, if potentials are represented using binary trees traditional methods may not offer the best results. In the present paper, two new heuristics that consider that potentials are represented as binary trees are proposed. As a result, the storage requirements for evaluating an ID with binary trees is reduced.

Published
2013
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