Reports de recerca
http://hdl.handle.net/2117/3937
2024-03-29T12:45:46ZA new method for computing the largest singular value and an associated right singular vector of a complex matrix
http://hdl.handle.net/2117/394293
A new method for computing the largest singular value and an associated right singular vector of a complex matrix
Carrasco, Juan A.
A new method for computing the largest singular value \xi_1 and an associated right singular vector of a large and sparse complex matrix A is developed. The method accelerates a new method for computing \xi_1 and an associated right singular vector which converges from an initial random vector under the only condition that the initial vector has component in the eigenspace of A^HA associated with eigenvalue \xi_1^2, where A^H denotes the transpose conjugate of A. The storage required by the accelerated new method in addition to the storage of A includes for A large and sparse basically the storage of a few complex vectors of the column or row dimension of A. Using two benchmarks of large sparse nonsingular square Hermitian complex matrices with known singular values it is analyzed the accuracy and computational cost of the accelerated new method. Using standard floating-point arithmetic, the accelerated new method is able to compute xi_1 with slightly less than 8 decimal digits of accuracy in the worst case. The new method is in average somewhat faster than a method combining Lanczos without orthogonalization and inverse iteration, which can be regarded as a previous state-of-the-art method for A large and sparse with similar storage requirements as the new method and is very old (it was well understood in the late 70’s).
Technical report
2023-09-29T10:22:21ZCarrasco, Juan A.A new method for computing the largest singular value \xi_1 and an associated right singular vector of a large and sparse complex matrix A is developed. The method accelerates a new method for computing \xi_1 and an associated right singular vector which converges from an initial random vector under the only condition that the initial vector has component in the eigenspace of A^HA associated with eigenvalue \xi_1^2, where A^H denotes the transpose conjugate of A. The storage required by the accelerated new method in addition to the storage of A includes for A large and sparse basically the storage of a few complex vectors of the column or row dimension of A. Using two benchmarks of large sparse nonsingular square Hermitian complex matrices with known singular values it is analyzed the accuracy and computational cost of the accelerated new method. Using standard floating-point arithmetic, the accelerated new method is able to compute xi_1 with slightly less than 8 decimal digits of accuracy in the worst case. The new method is in average somewhat faster than a method combining Lanczos without orthogonalization and inverse iteration, which can be regarded as a previous state-of-the-art method for A large and sparse with similar storage requirements as the new method and is very old (it was well understood in the late 70’s).Using temperature measurements to enhance security in front of hardware trojans
http://hdl.handle.net/2117/391985
Using temperature measurements to enhance security in front of hardware trojans
Altet Sanahujes, Josep; Mateo Peña, Diego; Barajas Ojeda, Enrique; Aragonès Cervera, Xavier
The goal of this document is to present a review of the work performed to carry out the task 3.5 of the Spanish National Project PID2019-103869RB-C33, entitled “El Reto de la Variabilidad en NANO-CMOS y BEYOND-CMOS: Nuevos Paradigmas de Diseño de Circuitos Integrados Para su Mitigación y Explotación (VIGILANT-UPC)”, whose principal investigator is Prof. Antonio Rubio. This document also resumes the deliverables of the task 3.5, which are: D2.3a: Report of the integrated circuit used in the experimentation D.2.3b: Report on the experimental characterization of the sensor. D.2.3c: Report of the procedure to extract golden signatures from sensor measurements. D.2.3d: Report of the self-healing procedure developed. D2.3e: Report of the IC measurements. D2.3f: Report on the reliability-aware BIST and machine learning techniques for monitoring of TDV.
The goal of this document is to present a review of the work performed to carry out the task 3.5 of the Spanish National Project PID2019-103869RB-C33, entitled “El Reto de la Variabilidad en NANO-CMOS y BEYOND-CMOS: Nuevos Paradigmas de Diseño de Circuitos Integrados Para su Mitigación y Explotación (VIGILANT-UPC)”, whose principal investigator is Prof. Antonio Rubio. This document also resumes the deliverables of the task 3.5, which are: D2.3a: Report of the integrated circuit used in the experimentation D.2.3b: Report on the experimental characterization of the sensor. D.2.3c: Report of the procedure to extract golden signatures from sensor measurements. D.2.3d: Report of the self-healing procedure developed. D2.3e: Report of the IC measurements. D2.3f: Report on the reliability-aware BIST and machine learning techniques for monitoring of TDV.
2023-07-24T10:08:39ZAltet Sanahujes, JosepMateo Peña, DiegoBarajas Ojeda, EnriqueAragonès Cervera, XavierThe goal of this document is to present a review of the work performed to carry out the task 3.5 of the Spanish National Project PID2019-103869RB-C33, entitled “El Reto de la Variabilidad en NANO-CMOS y BEYOND-CMOS: Nuevos Paradigmas de Diseño de Circuitos Integrados Para su Mitigación y Explotación (VIGILANT-UPC)”, whose principal investigator is Prof. Antonio Rubio. This document also resumes the deliverables of the task 3.5, which are: D2.3a: Report of the integrated circuit used in the experimentation D.2.3b: Report on the experimental characterization of the sensor. D.2.3c: Report of the procedure to extract golden signatures from sensor measurements. D.2.3d: Report of the self-healing procedure developed. D2.3e: Report of the IC measurements. D2.3f: Report on the reliability-aware BIST and machine learning techniques for monitoring of TDV.Diseño de un circuito de control
http://hdl.handle.net/2117/367961
Diseño de un circuito de control
López Lapeña, Oscar
2022-06-02T10:08:42ZLópez Lapeña, OscarPiecewise linearization of quadratic transfer characteristics
http://hdl.handle.net/2117/367540
Piecewise linearization of quadratic transfer characteristics
Pallàs-Areny, Ramon
Piecewise linearization replaces a nonlinear transfer characteristic curve by a string of linear
segments that connect several calibration points of the curve. This technique can be implemented by
low-power digital processors but no design rules are available to determine how many segments are
required for a given approximation between the actual curve and the polygonal line that replaces it. This
paper provides the design equations to decide the number and span of the segments needed to linearize
quadratic transfer characteristics such as those of the LM19 and the Pt100 (t > 0 °C) temperature
sensors. The method can be applied to higher-order polynomial transfer characteristics such as
thermocouples albeit non-uniform segmentation is not systematic in these cases. Using the proposed
approach, the Pt100 can be approximated by seven segments between 0 °C and 850 °C and three
segments between -200 °C and 0 °C, with a maximal deviation below 20 % of the uncertainty limit for
class B sensors in both cases. Better approximations are feasible provided truncation effects are
considered.
UPC-ISIG-2.EN
2022-05-19T16:05:25ZPallàs-Areny, RamonPiecewise linearization replaces a nonlinear transfer characteristic curve by a string of linear
segments that connect several calibration points of the curve. This technique can be implemented by
low-power digital processors but no design rules are available to determine how many segments are
required for a given approximation between the actual curve and the polygonal line that replaces it. This
paper provides the design equations to decide the number and span of the segments needed to linearize
quadratic transfer characteristics such as those of the LM19 and the Pt100 (t > 0 °C) temperature
sensors. The method can be applied to higher-order polynomial transfer characteristics such as
thermocouples albeit non-uniform segmentation is not systematic in these cases. Using the proposed
approach, the Pt100 can be approximated by seven segments between 0 °C and 850 °C and three
segments between -200 °C and 0 °C, with a maximal deviation below 20 % of the uncertainty limit for
class B sensors in both cases. Better approximations are feasible provided truncation effects are
considered.Basic design of the signal chain in sensor-based measurement systems
http://hdl.handle.net/2117/366745
Basic design of the signal chain in sensor-based measurement systems
Pallàs-Areny, Ramon; Casas Piedrafita, Óscar
Sensor signals do not suit direct electronic communication and need further
processing before being digitized. Therefore, the requirements of the digitizer add to those
needed to fulfill the basic specifications for the measurement system, namely measurement
range, resolution and accuracy, and general constraints such as power consumption and cost.
This tutorial describes how to use the quotient between the measurement range and the
resolution, termed dynamic range, as a guiding parameter to find out the signal processing
functions required in the signal chain, and determines the basic parameters of each function
for low-frequency signals.
2022-05-03T15:41:40ZPallàs-Areny, RamonCasas Piedrafita, ÓscarSensor signals do not suit direct electronic communication and need further
processing before being digitized. Therefore, the requirements of the digitizer add to those
needed to fulfill the basic specifications for the measurement system, namely measurement
range, resolution and accuracy, and general constraints such as power consumption and cost.
This tutorial describes how to use the quotient between the measurement range and the
resolution, termed dynamic range, as a guiding parameter to find out the signal processing
functions required in the signal chain, and determines the basic parameters of each function
for low-frequency signals.Semi-analytic discrete time model of a 1-stage CC-CP
http://hdl.handle.net/2117/366462
Semi-analytic discrete time model of a 1-stage CC-CP
Palma Carmona, Kenneth; Moll Echeto, Francisco de Borja
This paper employs a linear, discrete-time State- Space model of a CMOS Cross-Coupled Charge Pump (CCCP.) The discrete-time model is based on the analytic solution of the differential equations at each semi-period. This model allows to determine the electrical parameters of the circuit without lengthy electrical simulations. The model is introduced and various simulations of the model are compared with the transient response of FDSOI implementations.
Poster - 2019 XXXIV Conference on Design of Circuits and Integrated Systems (DCIS)
2022-04-27T14:15:46ZPalma Carmona, KennethMoll Echeto, Francisco de BorjaThis paper employs a linear, discrete-time State- Space model of a CMOS Cross-Coupled Charge Pump (CCCP.) The discrete-time model is based on the analytic solution of the differential equations at each semi-period. This model allows to determine the electrical parameters of the circuit without lengthy electrical simulations. The model is introduced and various simulations of the model are compared with the transient response of FDSOI implementations.Acoustic tracking of nephrops norvegicus by networked moored hydrophones in a deep-sea no-take reserve of the North Western Mediterranean Sea
http://hdl.handle.net/2117/346075
Acoustic tracking of nephrops norvegicus by networked moored hydrophones in a deep-sea no-take reserve of the North Western Mediterranean Sea
Masmitjà Rusiñol, Ivan; Gomáriz Castro, Spartacus; Río Fernandez, Joaquín del; Navarro, Joan; Vigo Fernandez, Maria; Aguzzi, Jacopo; Bahamón Rivera, Nixon; García, José Antonio; Rotllant Estelrich, Guiomar; Company Claret, Joan Baptista
Knowing the displacement capacity and mobility patterns of fished marine resources is pivotal to establish effective conservation management strategies in marine ecosystems. Accurate behavioral information of deep-sea fished ecosystems is necessary, but currently scarce, to establish the sizes and adequate locations of marine protected areas within the framework of large international societal programs (e.g. European Community H2020, as part of the Blue Growth economic strategy). A breakthrough in the autonomous capability of mobile platforms to deliver data on animal behavior beyond traditional fixed platform capabilities (e.g. cabled observatories) is overcoming these limitations. Here, we present useful example of that potential in relation to the implementation of autonomous underwater vehicles (AUVs) and remotely operated vehicles (ROVs) as an aid for acoustic long-baseline localization systems for autonomous tracking of Norway lobster (Nephrops norvegicus), one of the key resources exploited in European waters. We reported the outcomes of that monitoring in combination with seafloor moored acoustic receivers to detect and track the movements of 33 tagged individuals at 400 m depth over more than three months. We identified best procedures to localize both the acoustic receivers and the tagged-lobsters, based on cutting-edge algorithms designed for off-the-self acoustic tags identification. These procedures represent an important step forward for prolonged, in situ monitoring of deep-sea benthic animal behavior at meter spatial scales
Final report of the Working Group on Nephrops Surveys (WGNEPS)
2021-05-26T08:32:42ZMasmitjà Rusiñol, IvanGomáriz Castro, SpartacusRío Fernandez, Joaquín delNavarro, JoanVigo Fernandez, MariaAguzzi, JacopoBahamón Rivera, NixonGarcía, José AntonioRotllant Estelrich, GuiomarCompany Claret, Joan BaptistaKnowing the displacement capacity and mobility patterns of fished marine resources is pivotal to establish effective conservation management strategies in marine ecosystems. Accurate behavioral information of deep-sea fished ecosystems is necessary, but currently scarce, to establish the sizes and adequate locations of marine protected areas within the framework of large international societal programs (e.g. European Community H2020, as part of the Blue Growth economic strategy). A breakthrough in the autonomous capability of mobile platforms to deliver data on animal behavior beyond traditional fixed platform capabilities (e.g. cabled observatories) is overcoming these limitations. Here, we present useful example of that potential in relation to the implementation of autonomous underwater vehicles (AUVs) and remotely operated vehicles (ROVs) as an aid for acoustic long-baseline localization systems for autonomous tracking of Norway lobster (Nephrops norvegicus), one of the key resources exploited in European waters. We reported the outcomes of that monitoring in combination with seafloor moored acoustic receivers to detect and track the movements of 33 tagged individuals at 400 m depth over more than three months. We identified best procedures to localize both the acoustic receivers and the tagged-lobsters, based on cutting-edge algorithms designed for off-the-self acoustic tags identification. These procedures represent an important step forward for prolonged, in situ monitoring of deep-sea benthic animal behavior at meter spatial scalesCaracterització energètica de microxarxes. Primera part: Conceptes bàsics
http://hdl.handle.net/2117/332056
Caracterització energètica de microxarxes. Primera part: Conceptes bàsics
Piqué López, Robert; Puig Casteràs, Joan; Bargalló Perpiñá, Ramón; Casellas Beneyto, Francisco
Report de recerca (premanuscripto) on es presenten els resultats obtinguts orientats a una nova metodologia per a la caracterització de les microxarxes elèctriques. En aquesta part es presenten els conceptes bàsics d'aquesta metodologia de caracterització.
2020-11-12T14:12:51ZPiqué López, RobertPuig Casteràs, JoanBargalló Perpiñá, RamónCasellas Beneyto, FranciscoCaracterització energètica de microxarxes. Segona part: Caracterització energètica de microxarxes
http://hdl.handle.net/2117/332054
Caracterització energètica de microxarxes. Segona part: Caracterització energètica de microxarxes
Piqué López, Robert; Puig Casteràs, Joan; Bargalló Perpiñá, Ramón; Casellas Beneyto, Francisco
Report de recerca (premanuscripto) on es presenten els resultats obtinguts orientats a una nova metodologia per a la caracterització de les microxarxes elèctriques. En aquesta part es presenta la metodologia de caracterització energètica de microxarxes.
2020-11-12T14:08:23ZPiqué López, RobertPuig Casteràs, JoanBargalló Perpiñá, RamónCasellas Beneyto, FranciscoCaracterització energètica de microxarxes. Tercera part: Resum del mètode de caracterització i determinació algorísmica del sistema de gestió d'energia
http://hdl.handle.net/2117/332053
Caracterització energètica de microxarxes. Tercera part: Resum del mètode de caracterització i determinació algorísmica del sistema de gestió d'energia
Piqué López, Robert; Bargalló Perpiñá, Ramón; Casellas Beneyto, Francisco
2020-11-12T14:04:41ZPiqué López, RobertBargalló Perpiñá, RamónCasellas Beneyto, Francisco