http://hdl.handle.net/2117/3295 2013-05-24T21:11:28Z http://hdl.handle.net/2117/19183 Title: Model and requirements for a multiresolution time series database management system Authors: Llusa Serra, Aleix; Escobet Canal, Teresa; Vila Marta, Sebastià Abstract: In this paper we define a model for multiresolution time series database management systems. The main objective is to store compactly a time series and manage consistently its temporal dimension. It is achieved by extracting diferent resolutions and attributes summaries from the time series. Our work is concerned in putting together two areas of study: time series analysis and database management systems (DBMS). Time series analysis offers a great deal of methodologies and algorithms to process time series data and database field provides software expertise in managing data. Therefore it is of primary relevance that DBMS support time series. 2013-05-13T15:19:06Z http://hdl.handle.net/2117/18983 Title: Skeletal representations of orthogonal shapes Authors: Martínez Bayona, Jonás; Pla García, Núria; Vigo Anglada, Marc Abstract: Orthogonal shapes are polygons orpolyhedra enclosed byaxis-aligned edges orfaces, respectively. Inthis paper wepresent two skeletal representatio nsoforthogonal shapes: the cube skeleton and a family ofskeletal represe ntations provided bythe scale cube skeleton. Both skeletal represe ntations rely onthe L1 metric. Weshow that the cube skeleton is homotopically equivalent to its original shape,reduces its dimension,and it is composed of line segments orplanar polygons with restricted orientation. We also present analgorithm to compute the scale cube skeleton oforthogonal polygons and compare the presented skeletons with other skeletal represe ntations. 2013-04-25T11:11:36Z http://hdl.handle.net/2117/18255 Title: Juegos digitales en el aula: un caso de estudio Authors: Contreras Espinosa, Ruth S.; Eguía Gómez, Jose Luis; Solano Albajés, Lluís Abstract: Durante el año 2011 se diseño, implementó y estudió un juego digital que muestra la vida de un científico Catalán: El paleontólogo Mi - quel Crusafont. El juego fue creado como un recurso para el aprendizaje cognitivo y posteriormente fue utilizado en aulas de primaria con el fin de obtener la visión de los profesores involucrados. Como método de recolec - ción de datos se ha utilizado la observación, la entrevista en profundidad y el grupo focal. El objetivo principal de este estudio se centra en reunir la visión de profesores de primaria, al hacer uso de juegos en el aula. Las conclusiones nos muestran las percepciones que los miembros del grupo de estudio tiene sobre el uso de juegos digitales. 2013-03-13T12:23:04Z http://hdl.handle.net/2117/17576 Title: A scalable architecture for 3D map navigation on mobile devices Authors: Noguera, José María; Segura, Rafael; Ogáyar, Carlos; Joan Arinyo, Robert Abstract: Mobile devices such as smart phones or tablets are rapidly increasing their graphics and networking capabilities. However, real-time visualization of 3D maps is still a challenging task to accomplish on such limited devices. In this paper, we describe the principles involved in the design and development of a scalable client–server architecture for delivering 3D maps over wireless networks to mobile devices. We have developed a hybrid adaptive streaming and rendering method that distributes the 3D map rendering task between the mobile clients and a remote server. This architecture provides support for efficient delivery of 3D contents to mobile clients according to their capabilities. As a proof of concept, we have implemented a prototype and carried out exhaustive experiments considering different scenarios and hundreds of concurrent connected clients. The analysis of the server workload and the mobile clients performance show that our architecture achieves a great scalability and performance even when using low-end hardware. 2013-02-05T10:36:33Z http://hdl.handle.net/2117/17570 Title: Eines de la web 2.0 per a la coordinació d'assignatures: resultats preliminars Authors: Giralt Mas, Ma. Rosa; Bonet Dalmau, Jordi; Vila Marta, Sebastià; Palà Schönwälder, Pere; Águila López, Francisco del Abstract: Aquesta comunicació presenta els resultats d'utilització d'un Dipòsit de Material Docent amb les característiques pròpies de l'Open Course Ware, en el primer quadrimestre del nou grau en Enginyeria de Sistemes TIC que ofereix la Universitat Politècnica de Catalunya a l'Escola Politècnica Superior d'Enginyeria de Manresa. Aquesta acció s’emmarca en un projecte docent més ampli que abasta els tres primers quadrimestres del grau i la implantació d'una wiki a partir del segon quadrimestre. Aquest projecte més ampli té per objectiu millorar l'eficiència en l'aprenentatge introduint la web 2.0 com a eina quotidiana de coordinació del professorat i de treball en equip de l'alumnat. 2013-02-04T16:34:37Z http://hdl.handle.net/2117/16877 Title: Os games digitais como um recurso cognitivo na aprendizagem: um estudo de caso Authors: Eguía Gómez, Jose Luis; Contreras Espinosa, Ruth S.; Solano Albajés, Lluís Abstract: Os games digitais possuem um valor educativo importante e têm sido reconhecidos pelos educadores como um rico e produtivo espaço que proporciona conteúdos de aprendizagem para os estudantes, melhorando, através dele, o desenvolvimento cognitivo do aluno. Este artigo explora as oportunidades cognitivas dos games digitais como uma ferramenta de aprendizagem e mostra um estudo de caso: o jogo de Joan de Peratallada. O objetivo desse estudo é promover o diálogo e a possível colaboração entre um jogo digital cognitivo aplicado as escolas primárias de forma a colaborar com a ensino de historia de Catalunha, Espanha. 2012-11-12T09:16:12Z http://hdl.handle.net/2117/16466 Title: Computing parameter ranges in constructive geometric constraint solving: Implementation and correctness proof Authors: Hidalgo, Marta; Joan Arinyo, Robert Abstract: In parametric design, changing values of parameters to get different solution instances to the problem at hand is a paramount operation. One of the main issues when generating the solution instance for the actual set of parameters is that the user does not know in general which is the set of parameter values for which the parametric solution is feasible. Similarly, in constraint-based dynamic geometry, knowing the set of critical points where construction feasibility changes would allow to avoid unexpected and unwanted behaviors. We consider parametric models in the Euclidean space with one internal degree of freedom. In this scenario, in general, the set of values of the variant parameter for which the parametric model is realizable and defines a valid shape is a set of intervals on the real line. In this work we report on our experiments implementing the van der Meiden Approach to compute the set of parameter values that bound intervals for which the parametric object is realizable. The implementation is developed on top of a constructive, ruler-and-compass geometric constraint solver. We formalize the underlying concepts and prove that our implementation is correct, that is, the approach exactly computes all the feasible interval bounds. 2012-09-12T07:22:06Z http://hdl.handle.net/2117/15727 Title: Efficient algorithms for boundary extraction of 2D and 3D orthogonal pseudomanifolds Authors: Vigo Anglada, Marc; Pla García, Núria; Ayala Vallespí, M. Dolors; Martínez Bayona, Jonás Abstract: In this paper we present algorithms to extract the boundary representation of orthogonal polygons and polyhedra, either manifold or pseudomanifold. The algorithms we develop reconstruct not only the polygons of the boundaries but also the hole-face inclusion relationship. Our algorithms have a simple input so they can be used to convert many different kinds of models to B-Rep. In the 2D case, the input is the set of vertices, and in the 3D case, some small additional information must be supplied for every vertex. All proposed algorithms run in View the MathML source time and use O(n) space, where n is the number of vertices of the input. Moreover, we explain how to use our proposal to extract the boundary from the well-known voxel and octree models as well as from three vertex-based models found in the related literature: the neighbourhood, the EVM, and the weighted vertex list models. 2012-04-16T08:15:20Z http://hdl.handle.net/2117/14703 Title: Animation of 3D Avatars for Rehabilitation of the Upper Limbs Authors: Moya, Sergio; Grau Carrion, Sergi; Tost Pardell, Daniela; Campeny, Ricard; Ruiz, Marcel Abstract: The paper presents a 3D Virtual Environment (VE) for neurorehabilitation of the upper limb. Patients move one of their arms trying to simulate concrete daily actions, such as grasping a bottle, opening a door or putting a book on a shelve. They wear a special garment that integrates four inertial sensors providing in real time information on the orientation of the patient’s shoulder, elbow and wrist. The VE is a complete scenario integrating all the objects needed to perform virtually the actions simulated by the patients. In the VE, patients are represented by 3D avatars that, using the data provided by the inertial sensors, reproduce in real time their arm movements. Since only the arm movement is monitorized, but neither the hand nor the trunk and the neck, the system must combine real movements with baked animations in order to show a realistic behavior of the 3D avatar. Moreover, it must take into account collisions between the 3D avatar and the virtual objects. Finally, it must detect when the patient is about to simulate an interaction with an object in order to realize it virtually. We describe the strategies that we have designed to provide these functionalities. 2012-01-20T12:27:40Z http://hdl.handle.net/2117/14322 Title: A connected-component-labeling-based approach to virtual porosimetry Authors: Rodríguez, Jorge Ernesto; Cruz, Irving; Vergés Garcia, Eduard; Ayala Vallespí, M. Dolors Abstract: Analyzing the pore-size distribution of porous materials, made up of an aggregation of interconnected pores, is a demanding task. Mercury intrusion porosimetry (MIP) is a physical method that intrudes mercury into a sample at increasing pressures to obtain a poresize histogram. This method has been simulated in-silice with several approaches requiring prior computation of a skeleton. We present a new approach to simulate MIP that does not require skeleton computation. Our method is an iterative process that considers the diameters corresponding to pressures. At each iteration, geometric tests detect throats for the corresponding diameter and a CCL process collects the region invaded by the mercury. Additionally, a new decomposition model called CUDB, is used. This is suitable for computing the throats and performs better with the CCL algorithm than a voxel model. Our approach obtains the pore-size distribution of the porous medium, and the corresponding pore graph. 2011-12-27T10:59:00Z http://hdl.handle.net/2117/14127 Title: Videojuegos como un entorno de aprendizaje: el Caso de "Monturiol el joc"" Authors: Eguía Gómez, Jose Luis; Contreras Espinosa, Ruth S.; Solano Albajés, Lluís 2011-12-01T08:31:16Z http://hdl.handle.net/2117/13628 Title: Tecnologías complementarias: dos asignaturas del nuevo grado en ingeniería de sistemas TIC enfocadas a las competencias genéricas Authors: Escobet Canal, Teresa; Giralt Mas, Ma. Rosa; Palà Schönwälder, Pere; Vila Marta, Sebastià; Argelaguet Isanta, María Rosa Abstract: En el marco de la adaptación de las titulaciones al EEES, en la EPSEM se decidió impartir el grado en ingeniería de sistemas TIC. Este nuevo grado tiene por objetivo formar profesionales con un perfil generalista e integrador en el ámbito de las tecnologías electrónica, informática y de comunicaciones. Las materias de que consta el plan de estudios se focalizan en el estudio de dichas temáticas. En la elaboración de dicho plan de estudios, se consideró necesario introducir dos asignaturas, denominadas Tecnologías Complementarias 1 y 2, en las cuales se pretende aportar conocimientos relacionados la tecnología en general. Concretamente, se pretenden abordar algunos conocimientos del ámbito industrial y del ámbito social, así como, metodologías de trabajo individual y colectivo. En este artículo presentamos como se han planificado ambas asignaturas y los objetivos a conseguir. Se describen alguna de las actividades propuestas. 2011-10-21T17:39:15Z http://hdl.handle.net/2117/13626 Title: La integración de las tecnologías electrónica, informática y comunicaciones: diseño del nuevo grado en ingeniería de sistemas TIC Authors: Giralt Mas, Ma. Rosa; Palà Schönwälder, Pere; Escobet Canal, Teresa; Vila Marta, Sebastià; Argelaguet Isanta, María Rosa Abstract: La adaptación de las titulaciones al EEES ha supuesto un debate organizativo dentro de las universidades. En la EPSEM se decidió que uno de los grados que imparte fuera del ámbito TIC. Después de estudiar las necesidades de las empresas y el entorno industrial, el potencial interno de la escuela y los referentes externos, como pueden ser las recomendaciones de organizaciones profesionales y los grados impartidos por universidades extranjeras, se decidió apostar per un grado innovador y único en España: el grado en ingeniería de sistemas TIC. Este grado debería dar salida a titulados de un perfil generalista e integrador de las tecnologías electrónica, informática y de comunicaciones, dado que, hoy en día, ya no se conciben dispositivos que no integren al menos dos de estas tecnologías. La propuesta fue aprobada por la ANECA y el grado se ha empezado a impartir este curso con éxito. 2011-10-21T17:32:09Z http://hdl.handle.net/2117/13551 Title: An Adaptive Cutaway with Volume Context Preservation Authors: Grau Carrion, Sergi; Puig Puig, Anna Abstract: Knowledge expressiveness of scientific data is one of the most important visualization goals. However, current volume visualization systems require a lot of expertise from the final user. In this paper, we present a GPU-based ray casting interactive framework that computes two initial complementary camera locations and allows to select the focus interactively, on interesting structures keeping the volume’s context information with an adaptive cutaway technique. The adaptive cutaway surrounds the focused structure while preserving a depth immersive impression in the data set. Finally, we present a new brush widget to edit interactively the opening of the cutaway and to graduate the context in the final image. 2011-10-17T17:40:21Z http://hdl.handle.net/2117/13418 Title: Skeleton computation of orthogonal polyhedra Authors: Martínez Bayona, Jonás; Vigo Anglada, Marc; Pla García, Núria Abstract: Skeletons are powerful geometric abstractions that provide useful representations for a number of geometric operations. The straight skeleton has a lower combinatorial complexity compared with the medial axis. Moreover, while the medial axis of a polyhedron is composed of quadric surfaces the straight skeleton just consist of planar faces. Although there exist several methods to compute the straight skeleton of a polygon, the straight skeleton of polyhedra has been paid much less attention. We require to compute the skeleton of very large datasets storing orthogonal polyhedra. Furthermore, we need to treat geometric degeneracies that usually arise when dealing with orthogonal polyhedra. We present a new approach so as to robustly compute the straight skeleton of orthogonal polyhedra. We follow a geometric technique that works directly with the boundary of an orthogonal polyhedron. Our approach is output sensitive with respect to the number of vertices of the skeleton and solves geometric degeneracies. Unlike the existing straight skeleton algorithms that shrink the object boundary to obtain the skeleton, our algorithm relies on the plane sweep paradigm. The resulting skeleton is only composed of axis-aligned and 45 rotated planar faces and edges. 2011-10-04T14:00:51Z