Articles de revista
http://hdl.handle.net/2117/79800
2024-03-29T02:08:44ZConvolutional code theory based steganography technique
http://hdl.handle.net/2117/381328
Convolutional code theory based steganography technique
García Planas, María Isabel; Um, Laurence Emilie
Steganography, as it is known, is a technique to hide a secret message within a message or collection of data that is not secret, and a problem in mathematics is to decipher the secret included in the message, to solve this problem a good tool It is the theory of codes. Unlike the existing works that use block codes to hide information using the steganographic process, in this work, we propose the use of convolutional coding theory in steganography to encrypt and decrypt messages methods to decrypt messages. Here, we suggest a steganographic protocol based on convolutional codes in which they are defined as discrete linear dynamical systems with which the properties on controllability and observability characteristic of linear systems theory can be applied, in particular the properties of output observability character which can be easily described using matrix language. The proposed decoding algorithm used for dissimulation is a linear decoding method, which has decreased both the time and space complexity, compared to the Viterbi decoding algorithm, sometimes used in other cases; indeed, we go from 2h .n to 2h=2.n, in memory space (with h: constraint height, and n: length of cover object). Moreover, the time complexity is better, while we can also denote that with the convolutional approach, we intend to take advantage of the time-depending transaction.
2023-01-27T09:52:14ZGarcía Planas, María IsabelUm, Laurence EmilieSteganography, as it is known, is a technique to hide a secret message within a message or collection of data that is not secret, and a problem in mathematics is to decipher the secret included in the message, to solve this problem a good tool It is the theory of codes. Unlike the existing works that use block codes to hide information using the steganographic process, in this work, we propose the use of convolutional coding theory in steganography to encrypt and decrypt messages methods to decrypt messages. Here, we suggest a steganographic protocol based on convolutional codes in which they are defined as discrete linear dynamical systems with which the properties on controllability and observability characteristic of linear systems theory can be applied, in particular the properties of output observability character which can be easily described using matrix language. The proposed decoding algorithm used for dissimulation is a linear decoding method, which has decreased both the time and space complexity, compared to the Viterbi decoding algorithm, sometimes used in other cases; indeed, we go from 2h .n to 2h=2.n, in memory space (with h: constraint height, and n: length of cover object). Moreover, the time complexity is better, while we can also denote that with the convolutional approach, we intend to take advantage of the time-depending transaction.Anxiety Disorder Caused by Learning Difficulties in Mathematics
http://hdl.handle.net/2117/374085
Anxiety Disorder Caused by Learning Difficulties in Mathematics
García Planas, María Isabel; García-Camba Vives, María Victoria
One of the brain disorders causing great damage to those who suffer from it is dyscalculia. Dyscalculia often causes math anxiety. This circumstance is characterized by feelings of tension and fear that interfere with performance in tasks related to Mathematics. Mathematics anxiety is not always caused by a learning difficulty but in cases where this difficulty exists, if it is not diagnosed and treated properly, it is not possible to eliminate the anxiety. By using the BAEP technique, it is possible to determine the existence of a certain type of learning disorder, which allows attention to be focused on remedying the specific cause that produces the anxiety. Due to the existence of multiple factors that cause anxiety, the neuronal system that is activated is a network of interconnected networks whose controllability we need to study. In this work, we also study the controllability of multiagent neural networks by simulating possible brain networks.
2022-10-06T12:01:58ZGarcía Planas, María IsabelGarcía-Camba Vives, María VictoriaOne of the brain disorders causing great damage to those who suffer from it is dyscalculia. Dyscalculia often causes math anxiety. This circumstance is characterized by feelings of tension and fear that interfere with performance in tasks related to Mathematics. Mathematics anxiety is not always caused by a learning difficulty but in cases where this difficulty exists, if it is not diagnosed and treated properly, it is not possible to eliminate the anxiety. By using the BAEP technique, it is possible to determine the existence of a certain type of learning disorder, which allows attention to be focused on remedying the specific cause that produces the anxiety. Due to the existence of multiple factors that cause anxiety, the neuronal system that is activated is a network of interconnected networks whose controllability we need to study. In this work, we also study the controllability of multiagent neural networks by simulating possible brain networks.Controllability of brain neural networks in learning disorders—a geometric approach
http://hdl.handle.net/2117/360711
Controllability of brain neural networks in learning disorders—a geometric approach
García Planas, María Isabel; García-Camba Vives, María Victoria
The human brain can be interpreted mathematically as a linear dynamical system that shifts through various cognitive regions promoting more or less complicated behaviors. The dynamics of brain neural network play a considerable role in cognitive function and therefore of interest in the bid to understand the learning processes and the evolution of possible disorders. The mathematical theory of systems and control makes available procedures, concepts, and criteria that can be applied to ease the perception of the dynamic processes that administer the evolution of the brain with learning and its control with treatment in case of disorder. In this work, a geometric study through the conception of exact controllability is comprehended to detect the minimum set and the location of the driving nodes of learning. We will describe the different roles of the nodes in the control of the paths of brain networks and show the transition of some driving nodes and the preservation of the rest in the course of learning in patients with some learning disability.
2022-01-26T09:03:57ZGarcía Planas, María IsabelGarcía-Camba Vives, María VictoriaThe human brain can be interpreted mathematically as a linear dynamical system that shifts through various cognitive regions promoting more or less complicated behaviors. The dynamics of brain neural network play a considerable role in cognitive function and therefore of interest in the bid to understand the learning processes and the evolution of possible disorders. The mathematical theory of systems and control makes available procedures, concepts, and criteria that can be applied to ease the perception of the dynamic processes that administer the evolution of the brain with learning and its control with treatment in case of disorder. In this work, a geometric study through the conception of exact controllability is comprehended to detect the minimum set and the location of the driving nodes of learning. We will describe the different roles of the nodes in the control of the paths of brain networks and show the transition of some driving nodes and the preservation of the rest in the course of learning in patients with some learning disability.Geometric structure of the set of pairs of matrices under simultaneous similarity
http://hdl.handle.net/2117/359244
Geometric structure of the set of pairs of matrices under simultaneous similarity
García Planas, María Isabel
In this paper pairs of matrices under similarity are considered because of their scientific applications, especially pairs of matrices being simultaneously diagonalizable. For example, a problem in quantum mechanics is the position and momentum operators, because they do not have a shared base representing the system’s states. They do not commute, and that is why switching operators form a crucial element in quantum physics. A study of the set of linear operators consisting of pairs of simultaneously diagonalizable matrices is done using geometric constructions such as the principal bundles. The main goal of this work is to construct connections that allow us to establish a relationship between the local geometry around a point with the local geometry around another point. The connections give us a way to help distinguish bundle sections along tangent vectors.
2022-01-10T14:34:07ZGarcía Planas, María IsabelIn this paper pairs of matrices under similarity are considered because of their scientific applications, especially pairs of matrices being simultaneously diagonalizable. For example, a problem in quantum mechanics is the position and momentum operators, because they do not have a shared base representing the system’s states. They do not commute, and that is why switching operators form a crucial element in quantum physics. A study of the set of linear operators consisting of pairs of simultaneously diagonalizable matrices is done using geometric constructions such as the principal bundles. The main goal of this work is to construct connections that allow us to establish a relationship between the local geometry around a point with the local geometry around another point. The connections give us a way to help distinguish bundle sections along tangent vectors.Controllability subspaces of multi-agent linear dynamical systems
http://hdl.handle.net/2117/352130
Controllability subspaces of multi-agent linear dynamical systems
García Planas, María Isabel
This work addresses the controllability subspaces of a class of multi-agent linear systems that are interconnected via communication channels. Multiagent systems have attracted much attention because they have great applicability in multiple areas. Recently has taken an interest to analyze the control properties as consensus controllability of multi-agent dynamical systems motivated by the fact that the architecture of communication network in engineering multi-agent systems is usually adjustable. In this paper, the concept of invariant subspaces and controllability subspaces is reviewed and generalized to multi-agent systems. Finally, the consensus controllability subspaces are analyzed in the case of multiagent linear systems having all agents the same dynamics described as x¿ i = Aix i + Biu i , i = 0, 1, . . . , k.
2021-09-23T08:55:31ZGarcía Planas, María IsabelThis work addresses the controllability subspaces of a class of multi-agent linear systems that are interconnected via communication channels. Multiagent systems have attracted much attention because they have great applicability in multiple areas. Recently has taken an interest to analyze the control properties as consensus controllability of multi-agent dynamical systems motivated by the fact that the architecture of communication network in engineering multi-agent systems is usually adjustable. In this paper, the concept of invariant subspaces and controllability subspaces is reviewed and generalized to multi-agent systems. Finally, the consensus controllability subspaces are analyzed in the case of multiagent linear systems having all agents the same dynamics described as x¿ i = Aix i + Biu i , i = 0, 1, . . . , k.A coordinate atlas of the manifold of observable conditioned invariant subspaces
http://hdl.handle.net/2117/350141
A coordinate atlas of the manifold of observable conditioned invariant subspaces
Puerta Sales, Ferran; Puerta Coll, Xavier; Zaballa, I
Given an observable system (C,A) € Km×n×Kn×n with K = R or C , the set of (C,A)- invariant subspaces having the restricted system fixed observability indices is a smooth manifold embedded on the corresponding Grassmannian. We obtain an explicit parametrization of it by means of an atlas of coordinate charts. This parametrization can be applied to solve some design problems related to the Disturbance Decoupling Problem
2021-07-27T09:58:51ZPuerta Sales, FerranPuerta Coll, XavierZaballa, IGiven an observable system (C,A) € Km×n×Kn×n with K = R or C , the set of (C,A)- invariant subspaces having the restricted system fixed observability indices is a smooth manifold embedded on the corresponding Grassmannian. We obtain an explicit parametrization of it by means of an atlas of coordinate charts. This parametrization can be applied to solve some design problems related to the Disturbance Decoupling ProblemIntroducing and Evaluating the Effective Inclusion of Gender Dimension in STEM Higher Education
http://hdl.handle.net/2117/345819
Introducing and Evaluating the Effective Inclusion of Gender Dimension in STEM Higher Education
Peña Carrera, Marta; Olmedo Torre, Noelia; Mas de les Valls Ortiz, Elisabet; Lusa García, Amaia
The need to incorporate the gender dimension in higher education is a central element of gender equality policies within the European Union (EU). When most institutions of higher education have already strengthened and consolidated their curricula, the next challenge is to include and ensure that all people have the same opportunities to progress in education. This study intends to incorporate the gender dimension in teaching through a guide providing recommendations for the introduction of changes that will allow its effective incorporation in STEM (Science, Technology, Engineering and Mathematics) areas. It will take into account the administration in charge of formulating policies in the field of education, the students, and, mainly, the teaching staff. Its objective is to cover aspects related to the principles of equal opportunities and gender equality in STEM higher education disciplines. For this purpose, 41 volunteer teachers from 8 degrees and master’s degrees from the Universitat Politècnica de Catalunya in Spain participated. To achieve the results of this study, aspects related to social and gender relevance of the subjects, inclusive methodology, classroom management and assessment were considered. As a preliminary step to the development of the guide of recommendations, a teacher’s self-assessment tool and a questionnaire for students to analyze the perception of the gender dimension were developed.
2021-05-18T09:07:19ZPeña Carrera, MartaOlmedo Torre, NoeliaMas de les Valls Ortiz, ElisabetLusa García, AmaiaThe need to incorporate the gender dimension in higher education is a central element of gender equality policies within the European Union (EU). When most institutions of higher education have already strengthened and consolidated their curricula, the next challenge is to include and ensure that all people have the same opportunities to progress in education. This study intends to incorporate the gender dimension in teaching through a guide providing recommendations for the introduction of changes that will allow its effective incorporation in STEM (Science, Technology, Engineering and Mathematics) areas. It will take into account the administration in charge of formulating policies in the field of education, the students, and, mainly, the teaching staff. Its objective is to cover aspects related to the principles of equal opportunities and gender equality in STEM higher education disciplines. For this purpose, 41 volunteer teachers from 8 degrees and master’s degrees from the Universitat Politècnica de Catalunya in Spain participated. To achieve the results of this study, aspects related to social and gender relevance of the subjects, inclusive methodology, classroom management and assessment were considered. As a preliminary step to the development of the guide of recommendations, a teacher’s self-assessment tool and a questionnaire for students to analyze the perception of the gender dimension were developed.Convolutional codes and steganography under linear systems theoretical point of view
http://hdl.handle.net/2117/340498
Convolutional codes and steganography under linear systems theoretical point of view
García Planas, María Isabel; Um, Laurence Emilie; Soudi, El Mamoun; El Jouhari, Houda
In this work, we introduce an application of convolutional coding theory in steganography. As it is known, block codes are largely used for dissimulation of information using the steganographic process. Here, we suggest a steganographic protocol based on convolutional codes in which they are defined as linear systems. The proposed decoding algorithm used for dissimulation is a linear decoding method, which has drastically decreased the time complexity compared to the Viterbi decoding algorithm, sometimes used in other cases. We can also denote that with the convolutional approach, we intend to take advantage of the time-depending transaction.
2021-02-25T11:23:03ZGarcía Planas, María IsabelUm, Laurence EmilieSoudi, El MamounEl Jouhari, HoudaIn this work, we introduce an application of convolutional coding theory in steganography. As it is known, block codes are largely used for dissimulation of information using the steganographic process. Here, we suggest a steganographic protocol based on convolutional codes in which they are defined as linear systems. The proposed decoding algorithm used for dissimulation is a linear decoding method, which has drastically decreased the time complexity compared to the Viterbi decoding algorithm, sometimes used in other cases. We can also denote that with the convolutional approach, we intend to take advantage of the time-depending transaction.Analyzing control properties of multiagent linear systems
http://hdl.handle.net/2117/335867
Analyzing control properties of multiagent linear systems
García Planas, María Isabel
The networked multi-agent systems that they are interconnected via communication channels have great applicability in multiple areas, such as power grids, bioinformatics, sensor networks, vehicles, robotics and neuroscience, for example. Consequently, they have been widely studied by scientists in different fields in particular in the field of control theory. Recently an interest has grown to analyze the control properties as consensus controllability and observability of multi-agent dynamical systems motivated by the fact that the architecture of communication network in engineering multi-agent systems is usually adjustable. In this paper, we analyze how to improve the control properties in the case of multiagent linear time-invariant dynamical systems.
2021-01-25T08:19:27ZGarcía Planas, María IsabelThe networked multi-agent systems that they are interconnected via communication channels have great applicability in multiple areas, such as power grids, bioinformatics, sensor networks, vehicles, robotics and neuroscience, for example. Consequently, they have been widely studied by scientists in different fields in particular in the field of control theory. Recently an interest has grown to analyze the control properties as consensus controllability and observability of multi-agent dynamical systems motivated by the fact that the architecture of communication network in engineering multi-agent systems is usually adjustable. In this paper, we analyze how to improve the control properties in the case of multiagent linear time-invariant dynamical systems.Effectiveness of blended instructional design based on active learning in a graphic engineering course
http://hdl.handle.net/2117/330375
Effectiveness of blended instructional design based on active learning in a graphic engineering course
Olmedo Torre, Noelia; Martínez Martínez, María; Peña Carrera, Marta
Encouraging the use of active-learning methodologies, both inside and outside the classroom by means of planned activities, is a key factor in effective learning, as well as being essential for students to achieve the goals set for each subject by making them responsible for their own learning. In this longitudinal and quantitative study, we describe the different active learning activities, such as Flipped Classroom, Design Thinking, Visual Thinking, and Project-Based Learning (PBL), undertaken from 2015 to 2018 in the compulsory subject Graphic Expression imparted during the first year from all the degree studies of the Escola d'Enginyeria de Barcelona Est from Universitat Politècnica de Catalunya—UPC BarcelonaTech.
The introduction of active-learning teaching methodologies for the solving of problems with computer aided design throughout the course, with increasing complexity of exercise completion, has led to a significant improvement in academic results by students in this subject.
The results show that the inclusion of these methodologies improves student learning, as seen through the group development of an engineering
project presented on the conclusion of the course. PBL is the methodology that is most highly appreciated by students because it enables them to integrate all the skills and knowledge acquired throughout the course and is also the activity in which they obtain the best marks.
2020-10-16T13:30:00ZOlmedo Torre, NoeliaMartínez Martínez, MaríaPeña Carrera, MartaEncouraging the use of active-learning methodologies, both inside and outside the classroom by means of planned activities, is a key factor in effective learning, as well as being essential for students to achieve the goals set for each subject by making them responsible for their own learning. In this longitudinal and quantitative study, we describe the different active learning activities, such as Flipped Classroom, Design Thinking, Visual Thinking, and Project-Based Learning (PBL), undertaken from 2015 to 2018 in the compulsory subject Graphic Expression imparted during the first year from all the degree studies of the Escola d'Enginyeria de Barcelona Est from Universitat Politècnica de Catalunya—UPC BarcelonaTech.
The introduction of active-learning teaching methodologies for the solving of problems with computer aided design throughout the course, with increasing complexity of exercise completion, has led to a significant improvement in academic results by students in this subject.
The results show that the inclusion of these methodologies improves student learning, as seen through the group development of an engineering
project presented on the conclusion of the course. PBL is the methodology that is most highly appreciated by students because it enables them to integrate all the skills and knowledge acquired throughout the course and is also the activity in which they obtain the best marks.