Quantitative evaluation of overlaying discrepancies in mobile augmented reality applications for AEC/FM

Augmented Reality (AR) is a trending technology that provides a live view of the real and physical environment augmented by virtual elements, enhancing the information of the scene with digital information (sound, video, graphics, text or geo-location). Its application to architecture, engineering and construction, and facility management (AEC/FM) is straightforward and can be very useful to improve the on-site work at different stages of the projects. However, one of the most important limitations of Mobile Augmented Reality (MAR) is the lack of accuracy when the screen overlays the virtual models on the real images captured by the camera. The main reasons are errors related to tracking (positioning and orientation of the mobile device) and image capture and processing (projection and distortion issues). This paper shows a new methodology to mathematically perform a quantitative evaluation, in world coordinates, of those overlaying discrepancies on the screen, obtaining the real-scale distances from any real point to the sightlines of its virtual projections for any AR application. Additionally, a new utility for filtering built-in sensor signals in mobile devices is presented: the Drift-Vibration-Threshold function (DVT), a straightforward tool to filter the drift suffered by most sensor-based tracking systems

GomJau-Hogg´s Notation for Automatic Generation of k-Uniform Tessellations with ANTWERP v3.0

ABSTRACT: Euclidean tilings are constantly applied to many fields of engineering (mechanical, civil, chemical, etc.). These tessellations are usually named after Cundy & Rollett’s notation. However, this notation has two main problems related to ambiguous conformation and uniqueness. This communication explains the GomJau-Hogg’s notation for generating all the regular, semi-regular (uniform) and demi-regular (k-uniform, up to at least k = 3) in a consistent, unique and unequivocal manner. Moreover, it presents Antwerp v3.0, a free online application, which is publicly shared to prove that all the basic tilings can be obtained directly from the GomJau-Hogg’s notation

Novel Technique for Obtaining Double-Layer Tensegrity Grids

Double-layer tensegrity grids (DLTGs) may be defined as tensegrity spatial systems containing two parallel horizontal networks of members in tension forming the top and bottom layers, whose nodes are linked by vertical and/or inclined bracing members in compression and/or tension. In this paper, a new approach is described. Conventional double-layer grids (DLGs) are composed of three layers: top, bottom and bracing members. This paper shows new rules for generating original DLGs following a recent methodology for their composition, from the mosaic of the bracing members and additional laws. Finally, from them, a new technique, known as Rot- Umbela manipulation, is applied to obtain their tensegrity form, opening and endless catalogue of DLTGs

Structural analysis of a deployable double-layer tensegrity grid

Congreso celebrado en la Escuela de Arquitectura de la Universidad de Sevilla desde el 24 hasta el 26 de junio de 2015.Different methods have been used recently to discover new families of a type of space frame: Double- Layer Tensegrity Grids (DLTGs). The main objective of this work is analyzing the process for the design and calculation of a specific deployable DLTG (DDLTG) at full scale (4x4x1 m) composed by 16 modules of 1x1x1 m. Three CAD/CAE tools were used for these purposes: ToyGL, Matlab/Octave, and Midas Civil. It was necessary to create an intermediate platform to exchange data and information between both tools, the ToyGL Processor, based on user-defined functions written in VBA for Microsoft Excel. The methodology was validated by comparing the results obtained by the first two software tools with those provided by Midas Civil. As a conclusion, ToyGL is reliable and accurate in terms of the definition of geometry, distribution of stresses and forces, reactions, states of self-stress, mechanisms, etc

Information Management and Improvement of Citation Indices

Bibliometrics and citation analysis have become an important set of methods for library and information science, as well as an exceptional source of information and knowledge for many other areas. Their main sources are citation indices, which are bibliographic databases like Web of Science, Scopus, Google Scholar, etc. However, bibliographical databases lack perfection and standardization. There are several software tools that perform useful information management and bibliometric analysis importing data from them. A comparison has been carried out to identify which of them perform certain pre-processing tasks. Usually, they are not strong enough to detect all the duplications, mistakes, misspellings and variant names, leaving to the user the tedious and time-consuming task of correcting the data. Furthermore, some of them do not import datasets from different citation indices, but mainly from Web of Science (WoS). A new software tool, called STICCI.eu (Software Tool for Improving and Converting Citation Indices - enhancing uniformity), which is freely available online, has been created to solve these problems. STICCI.eu is able to do conversions between bibliographical citation formats (WoS, Scopus, CSV, BibTex, RIS), correct the usual mistakes appearing in those databases, detect duplications, misspellings, etc., identify and transform the full or abbreviated titles of the journals, homogenize toponymical names of countries and relevant cities or regions and list the processed data in terms of the most cited authors, journals, references, etc

Generation and nomenclature of tessellations and double-layer grids

The aim of this work is to establish a systematic methodology for generating automatically different tessellations and double-layer grids (DLGs) following a defined and specific nomenclature proposed originally for such a task. This particular nomenclature defines the notation of mosaics and DLGs in a synthesized and unique manner, with the advantage that it shows how to generate and design them after the parameters expressed on their own names. As a result, by means of an algorithm and some computational codes, it is possible to recreate in 3D any of those grids directly from their own names. Current nomenclature for tessellations is also analyzed, finding severe disadvantages, such as the excessive length of their notations or their non-uniqueness character. A new nomenclature is proposed in order to define and generate consistently and unequivocally n-uniform mosaics in a consistent manner with the current nomenclature used for the Archimedean (regular and semiregular) tessellations

Método de mitigación de impacto visual.

Un método para mitigar el impacto visual de una obra de infraestructura, en el que, a partir de un modelo digital del terreno, de una representación geométrica de la intrusión visual causada por una obra de infraestructura en una zona de observación, de una representación geométrica de dicha zona de observación desde la que se visualiza dicha intrusión visual y de una altura de una posible barrera de mitigación a levantar, se realizan las siguientes etapas: calcular numéricamente una superficie del lugar geométrico de los rayos visuales trazados desde dicha zona de observación hasta dicha representación geométrica de la intrusión visual; calcular numéricamente una superficie desplazada de dicho modelo digital del terreno una distancia definida por dicha altura; encontrar todas las curvas de intersección de ambas superficies; de toda la superficie abarcada por dichas curvas de intersección, delimitar la o las regiones en donde dicha superficie desplazada queda por encima de dicha superficie del lugar geométrico de los rayos visuales, siendo dicha región o regiones las zonas donde se consigue mitigar el impacto visual de dicha obra de infraestructura con barreras de altura.Solicitud: 201001331 (13.10.2010)Nº Pub. de Solicitud: ES2353103A1 (25.02.2011)Nº de Patente: ES2353103B2 (02.08.2011

Torres Quevedo's mechanical calculator for second-degree equations with complex coefficients

Leonardo Torres Quevedo worked intensively in analogue calculating machines during the last years of the 19th century. The algebraic calculators were calculating machines in which numbers are represented by quantities of a given physical magnitude(s). The physical result is a magnitude of a physical quantity whose measurement in the coherent unit is the result of the algebraic equation. This article shows the three-dimensional (3D) modelling, virtual reconstruction and simulation of the first mechanical calculating machine for solving second-degree equations with complex coefficients, to prove that the functionality was correct and the machine could be built. Sketches of said machine provide enough information on the shape and mechanisms of the machine. By means of the simulation, it has been possible to prove its operation and feasibility of construction so that it is possible to replicate it as a real physical model. The mechanical calculator for second-degree equations with complex coefficients constituted a major milestone in the technological development of the time and helped to originate and improve the design of other algebraic calculators like the machine for solving eighth-degree equations

Diseño y programación de un sistema VIA asistido por ordenador

Máster en Técnicas de Análisis, Evaluación y Gestión Sostenible de Procesos y Riesgos Naturale

Análisis de criterios de visibilidad e Impacto Visual: metodología de uso en proyectos de infraestructuras

El paisaje es un elemento indispensable para la sociedad que lo percibe, y cualquier modificación en el mismo afecta de manera directa a su identidad. En las últimas décadas, el concepto de paisaje como recurso natural, valorable no solo en términos visuales, sino también a través de las actividades que puedan aprovecharlo, ha tomado una gran importancia social y económica, apareciendo diversas leyes y regulaciones para su protección a nivel internacional, incluyendo entre sus objetivos la integración del paisaje en las políticas de ordenación territorial o urbanística que puedan tener un impacto directo o indirecto, lo que implica la valoración de los efectos producidos sobre el paisaje. Por ello, la valoración de los efectos que una infraestructura civil cualquiera puede causar sobre un territorio desde el punto de vista visual y paisajístico es un paso imprescindible para su tramitación administrativa y eventual aprobación. Esa evaluación es un proceso complejo, que depende de diversos factores y que no está delimitado con claridad. Por un lado es necesario evaluar técnicamente cómo la instalación puede afectar al recurso visual de un área determinada y el grado de modificación del paisaje en el que se va a implantar, y por otro tiene una carga social importante, que depende en gran medida de la sensibilidad del observador, de la relación que tiene con el territorio, y de la propia actitud hacia el nuevo proyecto. Para realizar la medida y cuantificación del recurso visual que se ve afectado al introducir una nueva infraestructura en un territorio determinado se realiza un análisis de visibilidad, que puede ser calculado y tenido en consideración durante toda la fase de diseño del proyecto. En este sentido, se ha desarrollado un método que permite medir el gasto visual y paisajístico (entendido como un recurso natural consumible) generado por una infraestructura durante la fase de diseño de modo fiable y eficiente (centrándonos sobre todo en la evaluación de parques eólicos). El presente trabajo de tesis expone en su primer capítulo la motivación para la realización de la tesis y los objetivos a alcanzar, así como una descripción global de la línea de investigación seguida. También en este capítulo se expone el marco teórico en el que se encuadra esta línea de investigación, junto con la descripción del proceso de búsqueda bibliográfica seguido. El núcleo central de la tesis está compuesto por el conjunto de artículos previamente publicados y un conjunto de nuevas aportaciones no publicadas, ya que la metodología ha seguido desarrollándose posteriormente a la publicación de los artículos, y han surgido otros estudios a raíz de ellos. Finalmente se presentan el conjunto de resultados obtenidos, junto con las conclusiones de la tesis, y una propuesta de futuras líneas de investigación