http://hdl.handle.net/2117/7019 Wed, 19 Jun 2013 21:43:56 GMT 2013-06-19T21:43:56Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no 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. Mon, 13 May 2013 15:19:06 GMT http://hdl.handle.net/2117/19183 2013-05-13T15:19:06Z Llusa Serra, Aleix; Escobet Canal, Teresa; Vila Marta, Sebastià no 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. http://hdl.handle.net/2117/18704 Title: Improving symbolic language comprehension Authors: Alsina Aubach, Montserrat; Bonet Dalmau, Jordi Abstract: We focus on the goal of “Handling mathematical symbols and formalism” through the methodology of Content and Language Integrated Learning. The use of foreign language highlights, and possibly increases, the difficulties in the point of mathematical competence, but it can also be used to fix them. That is, making explicit the equivalence between formal and verbal language could improve symbolic language comprehension. Multilingual Formulae, an on -line resource at http://mformulae.epsem.upc.edu, is designed to give support in that direction, as equivalence is not found explicitly in textbooks or research papers. It contains sets of formulas with the corresponding written and oral version in several languages. The project, conducted by professors at the UPC Engineering School at Manresa Campus, is addressed to lecturers and students as a support to ensure effective communication when both Symbolic and Foreign language are used. Mon, 08 Apr 2013 13:31:02 GMT http://hdl.handle.net/2117/18704 2013-04-08T13:31:02Z Alsina Aubach, Montserrat; Bonet Dalmau, Jordi no We focus on the goal of “Handling mathematical symbols and formalism” through the methodology of Content and Language Integrated Learning. The use of foreign language highlights, and possibly increases, the difficulties in the point of mathematical competence, but it can also be used to fix them. That is, making explicit the equivalence between formal and verbal language could improve symbolic language comprehension. Multilingual Formulae, an on -line resource at http://mformulae.epsem.upc.edu, is designed to give support in that direction, as equivalence is not found explicitly in textbooks or research papers. It contains sets of formulas with the corresponding written and oral version in several languages. The project, conducted by professors at the UPC Engineering School at Manresa Campus, is addressed to lecturers and students as a support to ensure effective communication when both Symbolic and Foreign language are used. http://hdl.handle.net/2117/17947 Title: Built-In test of MEMS capacitive accelerometers for field failures and aging degradation. Authors: Gómez Pau, Álvaro; Sanahuja Moliner, Ricard; Balado Suárez, Luz María; Figueras Pàmies, Joan Fri, 22 Feb 2013 14:42:57 GMT http://hdl.handle.net/2117/17947 2013-02-22T14:42:57Z Gómez Pau, Álvaro; Sanahuja Moliner, Ricard; Balado Suárez, Luz María; Figueras Pàmies, Joan no http://hdl.handle.net/2117/17732 Title: Elaboració de recursos multimèdia per a l'ensenyament/aprenentatge en anglès en graus tecnològics Authors: Alsina Aubach, Montserrat; Fortuny Santos, Jordi; Giralt Mas, Ma. Rosa Abstract: En aquest article es presenta el procés d'elaboració de recursos per a la impartició d'assignatures en anglès a l'ensenyament superior. Els principals resultats són les aplicacions Class-Talk i Multilingual Formulae, obertes a la comunitat educativa interessada en AICLE. Class-talk (http://www.upc.edu/slt/classtalk) conté la fraseologia docent d'us habitual. Multilingual Formulae (https://mformulae.epsem.upc.edu) conté la verbalització, oral i escrita, de fórmules i símbols matemàtics. Ambdós recursos s'adrecen a professorat i alumnat, d'origen català o internacional, involucrat en programes de millora de la competència lingüística; innovació docent al servei de la internacionalització de la universitat. Wed, 13 Feb 2013 15:43:37 GMT http://hdl.handle.net/2117/17732 2013-02-13T15:43:37Z Alsina Aubach, Montserrat; Fortuny Santos, Jordi; Giralt Mas, Ma. Rosa no En aquest article es presenta el procés d'elaboració de recursos per a la impartició d'assignatures en anglès a l'ensenyament superior. Els principals resultats són les aplicacions Class-Talk i Multilingual Formulae, obertes a la comunitat educativa interessada en AICLE. Class-talk (http://www.upc.edu/slt/classtalk) conté la fraseologia docent d'us habitual. Multilingual Formulae (https://mformulae.epsem.upc.edu) conté la verbalització, oral i escrita, de fórmules i símbols matemàtics. Ambdós recursos s'adrecen a professorat i alumnat, d'origen català o internacional, involucrat en programes de millora de la competència lingüística; innovació docent al servei de la internacionalització de la universitat. 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. Mon, 04 Feb 2013 16:34:37 GMT http://hdl.handle.net/2117/17570 2013-02-04T16:34:37Z Giralt Mas, Ma. Rosa; Bonet Dalmau, Jordi; Vila Marta, Sebastià; Palà Schönwälder, Pere; Águila López, Francisco del no 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. http://hdl.handle.net/2117/17558 Title: Leakage localization in water networks using fuzzy logic Authors: Sanz Estapé, Gerard; Pérez Magrané, Ramon; Escobet Canal, Antoni Abstract: This paper presents a methodology for leakage localization using FIR (Fuzzy Inductive Reasoning). A real water network situated in Barcelona has been subdivided in zones which could contain a leakage. Two sensors measure pressures on two separated points of the network. A faulty fuzzy model for each zone and sensor is generated. Test data have been used for classification of leakages in order to evaluate how this methodology helps in leakage localization. Results are compared with another isolation methodology. All the work has been done using simulations carried out by EPANET connected with Matlab. FIR applications used are programmed in Matlab too. Fri, 01 Feb 2013 11:48:26 GMT http://hdl.handle.net/2117/17558 2013-02-01T11:48:26Z Sanz Estapé, Gerard; Pérez Magrané, Ramon; Escobet Canal, Antoni no This paper presents a methodology for leakage localization using FIR (Fuzzy Inductive Reasoning). A real water network situated in Barcelona has been subdivided in zones which could contain a leakage. Two sensors measure pressures on two separated points of the network. A faulty fuzzy model for each zone and sensor is generated. Test data have been used for classification of leakages in order to evaluate how this methodology helps in leakage localization. Results are compared with another isolation methodology. All the work has been done using simulations carried out by EPANET connected with Matlab. FIR applications used are programmed in Matlab too. http://hdl.handle.net/2117/17073 Title: A fault/anomaly system prognosis using a data-driven approach considering uncertainty Authors: Escobet Canal, Teresa; Quevedo Casín, Joseba Jokin; Puig Cayuela, Vicenç Tue, 04 Dec 2012 12:27:29 GMT http://hdl.handle.net/2117/17073 2012-12-04T12:27:29Z Escobet Canal, Teresa; Quevedo Casín, Joseba Jokin; Puig Cayuela, Vicenç no http://hdl.handle.net/2117/16929 Title: Teaching symbolic language to non-native speakers Authors: Bonet Dalmau, Jordi; Alsina Aubach, Montserrat Abstract: In this paper, we describe how an on-line resource, primarily intended to improve the proficiency in a foreign language, can also facilitate the understanding of the symbolic language in an engineering degree course. We think that thanks to the use of this resource, a course in an engineering degree can tackle both the challenge of teaching symbolic language to non-native speakers and the challenge of doing this without losing insight into the concepts that appear in the course. Thu, 15 Nov 2012 11:42:22 GMT http://hdl.handle.net/2117/16929 2012-11-15T11:42:22Z Bonet Dalmau, Jordi; Alsina Aubach, Montserrat no In this paper, we describe how an on-line resource, primarily intended to improve the proficiency in a foreign language, can also facilitate the understanding of the symbolic language in an engineering degree course. We think that thanks to the use of this resource, a course in an engineering degree can tackle both the challenge of teaching symbolic language to non-native speakers and the challenge of doing this without losing insight into the concepts that appear in the course. http://hdl.handle.net/2117/16824 Title: Optimization of oxygen transfer through venturi-based systems applied to the biological sweetening of biogas Authors: Rodriguez, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedrós, Anna; Sanahuja Moliner, Ricard; Gabriel, David; Gamisans Noguera, Javier Wed, 31 Oct 2012 11:49:52 GMT http://hdl.handle.net/2117/16824 2012-10-31T11:49:52Z Rodriguez, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedrós, Anna; Sanahuja Moliner, Ricard; Gabriel, David; Gamisans Noguera, Javier no Biogas desulfurization, Biotrickling filters, Diffuser, Jet-venturi, Mass transfer, Venturi ejector http://hdl.handle.net/2117/16728 Title: Investigation of nanoscale interactions by means of subharmonic excitation Authors: Santos, Sergio; Phillips, M.A.; Verdaguer, Albert; Font Teixidó, Josep; Chiesa, Matteo; Gadelrab,, K.; Stefancich, M.; Armstrong, P.; Li, G.; Souier, T.; Thomson, Neil H.; Barcons Xixons, Víctor Abstract: Multifrequency atomic force microscopy holds promise as a method to provide qualitative and quantitative information about samples with high spatial resolution. Here, we provide experimental evidence of the excitation of subharmonics in ambient conditions in the regions where capillary interactions are predicted to be the mechanism of excitation. We also experimentally decouple a second mechanism for subharmonic excitation that is highly independent of environmental conditions such as relative humidity. This implies that material properties could be mapped. Subharmonic excitation could lead to experimental determination of surface water affinity in the nanoscale whenever water interactions are the mechanism of excitation. Tue, 16 Oct 2012 10:01:28 GMT http://hdl.handle.net/2117/16728 2012-10-16T10:01:28Z Santos, Sergio; Phillips, M.A.; Verdaguer, Albert; Font Teixidó, Josep; Chiesa, Matteo; Gadelrab,, K.; Stefancich, M.; Armstrong, P.; Li, G.; Souier, T.; Thomson, Neil H.; Barcons Xixons, Víctor no Ambient conditions, Capillary interactions, Environmental conditions, Experimental determination, Experimental evidence, High spatial resolution, Material property, Multi frequency, Nano scale, Nanoscale interactions, Quantitative information, Sub-harmonic excitation, Subharmonics, Water affinity, Water interactions Multifrequency atomic force microscopy holds promise as a method to provide qualitative and quantitative information about samples with high spatial resolution. Here, we provide experimental evidence of the excitation of subharmonics in ambient conditions in the regions where capillary interactions are predicted to be the mechanism of excitation. We also experimentally decouple a second mechanism for subharmonic excitation that is highly independent of environmental conditions such as relative humidity. This implies that material properties could be mapped. Subharmonic excitation could lead to experimental determination of surface water affinity in the nanoscale whenever water interactions are the mechanism of excitation. http://hdl.handle.net/2117/16725 Title: Quantification of dissipation and deformation in ambient atomic force microscopy Authors: Santos, Sergio; Gadelrab,, K.; Barcons Xixons, Víctor; Stefancich, M.; Chiesa, Matteo Abstract: A formalism to extract and quantify unknown quantities such as sample deformation, the viscosity of the sample and surface energy hysteresis in amplitude modulation atomic force microscopy is presented. Recovering the unknowns only requires the cantilever to be accurately calibrated and the dissipative processes occurring during sample deformation to be well modeled. The theory is validated by comparison with numerical simulations and shown to be able to provide, in principle, values of sample deformation with picometer resolution. Tue, 16 Oct 2012 08:18:07 GMT http://hdl.handle.net/2117/16725 2012-10-16T08:18:07Z Santos, Sergio; Gadelrab,, K.; Barcons Xixons, Víctor; Stefancich, M.; Chiesa, Matteo no Dissipative process, Energy hysteresis, Picometer resolution, Sample deformation, Unknown quantity A formalism to extract and quantify unknown quantities such as sample deformation, the viscosity of the sample and surface energy hysteresis in amplitude modulation atomic force microscopy is presented. Recovering the unknowns only requires the cantilever to be accurately calibrated and the dissipative processes occurring during sample deformation to be well modeled. The theory is validated by comparison with numerical simulations and shown to be able to provide, in principle, values of sample deformation with picometer resolution. http://hdl.handle.net/2117/16432 Title: Health aware control and model-based prognosis Authors: Escobet Canal, Teresa; Puig Cayuela, Vicenç; Nejjari Akhi-Elarab, Fatiha Abstract: This paper presents a novel methodology named Health-Aware Control (HAC) system, that integrates System Health Monitoring (SHM), Control and Prognosis. This new approach based on both current and future health state estimates, provided by the prognosis module, takes into account the system’s health information in the control objectives. In this way, the control actions are generated to fulfill the control goals and, at the same time, to extend the life of the system components. To illustrate the performance of the proposed approach, a conveyor belt system that uses an AC electrical motor to move a cart from one end to the other is used. Wed, 05 Sep 2012 09:49:39 GMT http://hdl.handle.net/2117/16432 2012-09-05T09:49:39Z Escobet Canal, Teresa; Puig Cayuela, Vicenç; Nejjari Akhi-Elarab, Fatiha no This paper presents a novel methodology named Health-Aware Control (HAC) system, that integrates System Health Monitoring (SHM), Control and Prognosis. This new approach based on both current and future health state estimates, provided by the prognosis module, takes into account the system’s health information in the control objectives. In this way, the control actions are generated to fulfill the control goals and, at the same time, to extend the life of the system components. To illustrate the performance of the proposed approach, a conveyor belt system that uses an AC electrical motor to move a cart from one end to the other is used. http://hdl.handle.net/2117/15907 Title: Automatic design of robust PID controllers based on QFT specifications Authors: Comasòlivas Font, Ramon; Escobet Canal, Teresa; Quevedo Casín, Joseba Jokin Abstract: This paper proposes an optimization algorithm for the automatic design of robust PID controllers using Quantitative Feedback Theory (QFT) specifications. The proposed algorithm is based on a criterion to minimize the energy of the control effort. To illustrate the methodology, the pitch angle of a laboratory helicopter is used as a model application with structured uncertainty. The results show that the design of robust controller can be formulated using an objective function and a number of restrictions that are developed as specifications. Tue, 22 May 2012 07:59:37 GMT http://hdl.handle.net/2117/15907 2012-05-22T07:59:37Z Comasòlivas Font, Ramon; Escobet Canal, Teresa; Quevedo Casín, Joseba Jokin no This paper proposes an optimization algorithm for the automatic design of robust PID controllers using Quantitative Feedback Theory (QFT) specifications. The proposed algorithm is based on a criterion to minimize the energy of the control effort. To illustrate the methodology, the pitch angle of a laboratory helicopter is used as a model application with structured uncertainty. The results show that the design of robust controller can be formulated using an objective function and a number of restrictions that are developed as specifications. http://hdl.handle.net/2117/15767 Title: Spatial horizons in amplitude and frequency modulation atomic force microscopy Authors: Font Teixidó, Josep; Santos Hernandez, Sergi; Barcons Xixons, Víctor; Thomson, Neil H.; Verdaguer, Albert; Chiesa, Matteo Abstract: In dynamic atomic force microscopy (AFM) the cantilever is vibrated and its dynamics are monitored to probe the sample with nanoscale and atomic resolution. Amplitude and frequency modulation (AM and FM) atomic force microscopy have established themselves as the most powerful, robust and reliable techniques in the field. Nevertheless, it is still debatable whether one or the other technique is preferred in a given medium or experiment. Here, we quantitatively establish the limitations in resolution of one and the other technique by introducing the concept of space horizon SH and quantifying it. The SH is the limiting space boundary beyond which collective atomic interactions do not affect the detection parameters of a given feedback system. We show that while an FM feedback can resolve an atom where an AM feedback might fail, relative contrast is in fact equivalent for both feedback systems. That is, if the AM feedback could detect sufficiently small amplitude shifts and there was no noise, single atom imaging would be equivalent in AM and FM. Fri, 27 Apr 2012 15:40:55 GMT http://hdl.handle.net/2117/15767 2012-04-27T15:40:55Z Font Teixidó, Josep; Santos Hernandez, Sergi; Barcons Xixons, Víctor; Thomson, Neil H.; Verdaguer, Albert; Chiesa, Matteo no In dynamic atomic force microscopy (AFM) the cantilever is vibrated and its dynamics are monitored to probe the sample with nanoscale and atomic resolution. Amplitude and frequency modulation (AM and FM) atomic force microscopy have established themselves as the most powerful, robust and reliable techniques in the field. Nevertheless, it is still debatable whether one or the other technique is preferred in a given medium or experiment. Here, we quantitatively establish the limitations in resolution of one and the other technique by introducing the concept of space horizon SH and quantifying it. The SH is the limiting space boundary beyond which collective atomic interactions do not affect the detection parameters of a given feedback system. We show that while an FM feedback can resolve an atom where an AM feedback might fail, relative contrast is in fact equivalent for both feedback systems. That is, if the AM feedback could detect sufficiently small amplitude shifts and there was no noise, single atom imaging would be equivalent in AM and FM. http://hdl.handle.net/2117/15691 Title: A high-resolution UWB IR superregenerative receiver front end with an SRD quench shaper Authors: Moncunill Geniz, Francesc Xavier; Bonet Dalmau, Jordi; Palà Schönwälder, Pere; Águila López, Francisco del; Giralt Mas, Ma. Rosa Abstract: We present a simple receiver front end that makes use of the baseband superregeneration principle to detect ultrawideband (UWB) impulse radio signals. The UWB antenna is directly connected to the core circuit consisting of a resistor-capacitor (RC) network coupled to a negative resistance that varies under the control of an external quench generator. Due to a step-recovery-diode quench shaper, 50-ps time-domain sensitivity windows are generated that filter the received pulses and reject noise and interference. The circuit achieves high gain, exhibits automatic gain control, and directly demodulates binary phase modulations. Fri, 30 Mar 2012 15:01:17 GMT http://hdl.handle.net/2117/15691 2012-03-30T15:01:17Z Moncunill Geniz, Francesc Xavier; Bonet Dalmau, Jordi; Palà Schönwälder, Pere; Águila López, Francisco del; Giralt Mas, Ma. Rosa no ultrawideband (UWB) communication., Circuit stability, impulse radio (IR), low-power design, radio receivers, step recovery diode (SRD), superregenerative receiver We present a simple receiver front end that makes use of the baseband superregeneration principle to detect ultrawideband (UWB) impulse radio signals. The UWB antenna is directly connected to the core circuit consisting of a resistor-capacitor (RC) network coupled to a negative resistance that varies under the control of an external quench generator. Due to a step-recovery-diode quench shaper, 50-ps time-domain sensitivity windows are generated that filter the received pulses and reject noise and interference. The circuit achieves high gain, exhibits automatic gain control, and directly demodulates binary phase modulations.