Generating IFC-compliant models and structural graphs of truss bridges from dense point clouds

The IFC schema has been evolving towards the infrastructure domain. Furthermore, the use of laser scanning technologies as means to digitalize and monitor infrastructures has also significantly increased. This work presents an automated modelling approach for truss bridges that utilizes laser scanning data as its source for geometrical information. The methodology takes a partially instance-segmented point cloud of a truss bridge and generates both an IFC-compliant information model of the truss and the corresponding structural graph. This process uses bounding boxes and their collisions to overcome the missing data from the partial segmentation to create the truss model, as well as to identify the nodes that connect the different truss members. The methodology was tested on a use case made of 272 members and obtained the truss model and structural graph files.Universidade de Vigo | Ref. PREUVIGO-21Agencia Estatal de Investigación | Ref. FJC2020–046370-IAgencia Estatal de Investigación | Ref. PID2021-124236OB-C33Agencia Estatal de Investigación | Ref. FJC2020–046370-IFinanciado para publicación en acceso aberto: Universidade de Vigo/CISU

Physical properties of a new dipeptide ionic liquid in water and methanol at several temperatures: Correlation and prediction

Financiado para publicación en acceso aberto: Universidade de Vigo/CISUGThe physical properties of choline glycylglycinate (ChGlyGly) were experimentally determined at several temperatures. The empirical values of density, refractive index, speed of sound and dynamic viscosity for aqueous and methanolic mixtures of this ionic liquid were also ascertained at different temperatures. From these values, isentropic compressibility, molar volume, free volume, isobaric thermal expansivity and molar refraction have been calculated along with critical parameters (temperature, volume and pressure), acentric factor and boiling point. From a theoretical point of view, derived values of the neat ChGlyGly and the corresponding mixtures have been ascertained in the abovementioned temperature interval. Polynomial fittings turned to suitably describe the obtained data while Redlich-Kister has been used to fit to the derived magnitudes. To conclude, the density of the mixtures has been successfully predicted at several temperatures for the first time by means of different modelsMinisterio de Ciencia, Innovación y Universidades | Ref. RTI2018-094702-B-I0

Choline dihydrogen phosphate-based deep eutectic solvent: a suitable bioplatform for lipase extraction

In this work, we have demonstrated the suitability of a novel Deep Eutectic Solvent (DES) composed of cholinium dihydrogen phosphate and ethylene glycol at a molar ratio of 1:2 (ChDHP:EG) to extract Candida antarctica lipase B from aqueous solutions of non-ionic surfactants Triton X-100 and Tween 80. The binodal curves were firstly explored at temperatures between 298.15 and 333.15 K and the experimental data were correlated by means of empirical models based on exponential and polynomial equations. The tie-lines have been ascertained by means of density and refractive indices measurement, and Othmer-Tobias, Bancroft and Setschenow equations were proposed to correlate these data. The Tween 80-based Aqueous Biphasic System was demonstrated to avoid any deleterious effect on the lipase biocatalytic activity, and more than 80% of the enzyme activity was retained on the DES-rich phase, which proves the suitability of these platforms to be employed in downstream stages in lipase production processes.Financiado para publicación en acceso aberto: Universidade de Vigo/CISUGXunta de Galicia | Ref. ED481D-2019/017Xunta de Galicia | Ref. ED431F 2016/007Agencia Estatal de Investigación | Ref. RTI2018-094702-B-I0

CONSTRUCCION DEL PERFIL DEL EGRESADO DEL CICLO CLINICO

Esta investigación fue realizada, como parte integrante del Proyecto de Innovación Curricular, con la necesidad de la construcción de un perfil de egresado, en el ciclo o asignaturas clínicas, para posteriormente, realizar el perfil del Egresado de la Facultad de Ciencias Médicas de la Universidad Nacional de Asunción (FCM-UNA).La misma, la fuimos construyendo a partir de artículos, documentos y actores relevantes tanto dentro y como fuera de la Institución, que permitió así contribuir en la construcción de una propuesta que optimice la formación universitaria de los estudiantes de la carrera de medicina.Como docentes de la universidad hemos constatado una serie de problemas que se relacionan tanto con el aislamiento de las disciplinas que se manejan en forma totalmente independientes dificultando un aprendizaje integrado de los estudiantes, como su poca formación en gestión, en investigación y la necesidad un estudio exhaustivo y de mejor relacionamiento interhumano con los pacientes y con los propios colegas. Seria apropiada para intencionar los procesos de enseñanza y aprendizaje y el perfil de un médico acorde a las necesidades político- social, cultural y de desarrollo económico.Nuestro objetivo fue analizar e interpretar documentos y percepción de los actores relevantes en cuanto a la formación de médico, que permita aportar datos para levantar una propuesta de perfil del ciclo clínico, integrado y pertinente a través de un diseño cualitativo con un énfasis comprensivo.Para el levantamiento de información se recurrió a la revisión de artículos, donde buscamos el perfil de otras Universidades de medicinas referentes, tantos de MERCOSUR, como Internacionales. Se realizaron focus group en docentes, pacientes y egresado de la FCM-UNA, también se utilizó entrevistas a empleadores del sector privado, público y seguro social.Posteriormente, se realizó el proceso de análisis de contenidos con interés interpretativo.En cuanto al resultado obtenido podemos decir que el egresado clínico debe reunir cierta competencia clínicas, además de buenos relacionamientos con los pacientes, parientes y sus propios colegas y el personal de apoyo. Cabe además señalar algunos actores coinciden en interacción comunicativas y además en incorporar tecnología de avanzadas, actualización permanente en los saberes disciplinares y en la investigación, una formación contextualizada social y que atienda las necesidades de salud de la población. Una demanda expresada convergentemente es la consideración de la gestión como parte del desempeño del médico, asimismo, en la dimensión de la responsabilidad social, pacientes, egresados y empleadores; relevan la necesidad de formar médicos con sentido humanista, comprometidos con el proyecto de justicia social y que sean éticos, advierten del peligro de la mercantilización del acto médico como regulador de la relación médico-paciente, entre otros. Un importante hallazgo de la investigación, fue la aparición de dos dimensiones demandadas en la formación del médico como es la enseñanza/docenci

Performance of visual inspection of the cervix with acetic acid (VIA) for triage of HPV screen-positive women: results from the ESTAMPA study

Q1Q1Pacientes con Virus del Papiloma Humano (VPH)VIA is recommended for triage of HPV-positive women attending cervical screening. In the multicentric ESTAMPA study, VIA performance for detection of cervical intraepithelial neoplasia grade 3 or worse (CIN3+) among HPV-positive women was evaluated. Women aged 30-64 years were screened with HPV testing and cytology and referred to colposcopy if either test was positive. At colposcopy visit, study-trained midwives/nurses/GPs performed VIA ahead of colposcopy. VIA was considered positive if acetowhite lesions were observed in or close to the transformation zone. Ablative treatment eligibility was assessed for VIA positives. Performance indicators were estimated. Three thousand one hundred and forty-two HPV-positive women were included. Sensitivity for CIN3+ was 85.9% (95% CI 81.2-89.5) among women <50 years and, although not significant, slightly lower in women 50+ (78.0%, 95% CI 65.9-86.6). Overall specificity was 58.6% (95% CI 56.7-60.5) and was significantly higher among women 50+ (70.3%, 95% CI 66.8-73.5) compared to women <50 (54.3%, 95% CI 52.1-56.5). VIA positivity was lower among women 50+ (35.2%, 95% CI 31.9-38.6) compared to women <50 (53.2, 95% CI 51.1-55.2). Overall eligibility for ablative treatment was 74.5% and did not differ by age. VIA sensitivity, specificity, and positivity, and ablative treatment eligibility varied highly by provider (ranges: 25%-95.4%, 44.9%-94.4%, 8.2%-65.3%, 0%-98.7%, respectively). VIA sensitivity for cervical precancer detection among HPV-positive women performed by trained providers was high with an important reduction in referral rates. However, scaling-up HPV screening triaged by VIA will be challenging due to the high variability of VIA performance and providers' need for training and supervision.https://orcid.org/0000-0001-7187-9946Revista Internacional - IndexadaA1N

Programas de Auxiliares Docentes Postgraduados

Fac. de PsicologíaFALSEsubmitte

Multicentric study of cervical cancer screening with human papillomavirus testing and assessment of triage methods in Latin America : the ESTAMPA screening study protocol

Q1Q1Introduction Human papillomavirus (HPV) testing is replacing cytology in primary screening. Its limited specificity demands using a second (triage) test to better identify women at high-risk of cervical disease. Cytology represents the immediate triage but its low sensitivity might hamper HPV testing sensitivity, particularly in low-income and middle-income countries (LMICs), where cytology performance has been suboptimal. The ESTAMPA (EStudio multicéntrico de TAMizaje y triaje de cáncer de cuello uterino con pruebas del virus del PApiloma humano; Spanish acronym) study will: (1) evaluate the performance of different triage techniques to detect cervical precancer and (2) inform on how to implement HPV-based screening programmes in LMIC. Methods and analysis Women aged 30–64 years are screened with HPV testing and Pap across 12 study centres in Latin America. Screened positives have colposcopy with biopsy and treatment of lesions. Women with no evident disease are recalled 18 months later for another HPV test; those HPV-positive undergo colposcopy with biopsy and treatment as needed. Biological specimens are collected in different visits for triage testing, which is not used for clinical management. The study outcome is histological high-grade squamous intraepithelial or worse lesions (HSIL+) under the lower anogenital squamous terminology. About 50 000 women will be screened and 500 HSIL+ cases detected (at initial and 18 months screening). Performance measures (sensitivity, specificity and predictive values) of triage techniques to detect HSIL+ will be estimated and compared with adjustment by age and study centre. Ethics and dissemination The study protocol has been approved by the Ethics Committee of the International Agency for Research on Cancer (IARC), of the Pan American Health Organisation (PAHO) and by those in each participating centre. A Data and Safety Monitoring Board (DSMB) has been established to monitor progress of the study, assure participant safety, advice on scientific conduct and analysis and suggest protocol improvements. Study findings will be published in peer-reviewed journals and presented at scientific meetings. Trial registration number NCT01881659Revista Internacional - Indexad

3D Point cloud to BIM: semi-automated framework to define IFC alignment entities from MLS-acquired LiDAR data of highway roads

Building information modeling (BIM) is a process that has shown great potential in the building industry, but it has not reached the same level of maturity for transportation infrastructure. There is a standardization need for information exchange and management processes in the infrastructure that integrates BIM and Geographic Information Systems (GIS). Currently, the Industry Foundation Classes standard has harmonized different infrastructures under the Industry Foundation Classes (IFC) 4.3 release. Furthermore, the usage of remote sensing technologies such as laser scanning for infrastructure monitoring is becoming more common. This paper presents a semi-automated framework that takes as input a raw point cloud from a mobile mapping system, and outputs an IFC-compliant file that models the alignment and the centreline of each road lane in a highway road. The point cloud processing methodology is validated for two of its key steps, namely road marking processing and alignment and road line extraction, and a UML diagram is designed for the definition of the alignment entity from the point cloud data.Horizon 2020 Framework Programme | Ref. 769255Ministerio de Ciencia, Innovación y Universidades | Ref. RTI2018-095893-B-C21Ministerio de Ciencia e Innovación y Universidades | Ref. FJC2018-035550-

Automated inspection of railway tunnels’ power line using LiDAR point clouds

Transport networks need periodic inspections to increase their safety and improve their management. In the last few years, LiDAR (light detection and ranging) technology has become a tool for helping to create a precise database of almost any type of infrastructure. Mobile laser scanning (MLS) systems use a laser beam to collect dense three dimensional (3D) point clouds, which include geometric and radiometric data of the environment in which they are placed. In the context of this paper, a methodology for automatically inspecting the clearance gauge and the deflection of the aerial contact line in railway tunnels is presented. The main objective is to compare results and verify their compliance with the Spanish norm. The 3D data are provided by a LYNX Mobile Mapper System (MMS). First, the area is surveyed and then the obtained (3D) point cloud is classified into contact wire, suspension wire, and remaining points. Finally, the inspection of the railway’s power line is performed. The validation of the proposed methodology has been carried out in three different tunnel point clouds, obtaining both qualitative and quantitative results for points’ classification, together with the results of the measures performed.Universidade de Vigo | Ref. 00VI 131H 6410211Horizon 2020 Framework Programme | Ref. 76925

Safety assessment on pedestrian crossing environments using MLS data

In the framework of infrastructure analysis and maintenance in an urban environment, it is important to address the safety of every road user. This paper presents a methodology for the evaluation of several safety indicators on pedestrian crossing environments using geometric and radiometric information extracted from 3D point clouds collected by a Mobile Mapping System (MMS). The methodology is divided in four main modules which analyze the accessibility of the crossing area, the presence of traffic lights and traffic signs, and the visibility between a driver and a pedestrian on the proximities of a pedestrian crossing. The outputs of the analysis are exported to a Geographic Information System (GIS) where they are visualized and can be further processed in the context of city management. The methodology has been tested on approximately 30 pedestrian crossings in cluttered urban environments of two different cities. Results show that MMS are a valid mean to assess the safety of a specific urban environment, regarding its geometric conditions. Remarkable results are presented on traffic light classification, with a global F-score close to 95%Dirección General de Tráfico (Spanish Ministry of Interior) | Ref. SPIP2017-02122Xunta de Galicia | Ref. ED431C2016‐038Human Resources Program FPI | Ref. BES-2014-06773