Juan Felipe Miranda Medina | Universidad Católica San Pablo (original) (raw)
Papers by Juan Felipe Miranda Medina
Este capítulo presenta una mirada hacia la historia del renacimiento afroperuano en paralelo con ... more Este capítulo presenta una mirada hacia la historia del renacimiento afroperuano en paralelo con la historia del contrapunto de zapateo criollo, una de las prácticas que más destacó el renacimiento. Enfatizando en las nociones de ruptura y acontecimiento del filósofo francés Alain Badiou, se examinan ambos como rupturas que constituyen una nueva historia. En el caso específico del contrapunto esta ruptura está dada por la transición de ser un concurso a ser una práctica escénica. Este documento es el primero en enumerar, hasta donde tengo conocimiento, los cambios fundamentales que esta transición implica: ya no hay un juez, el público cobra un rol fundamental, intervienen más de dos zapateadores, se cierra con una coreografía común. El hecho de que no haya un juez que determine un ganador sella el carácter dialéctico del contrapunto de zapateo escénico. Estas páginas buscan rescatar ese interacción dialéctica de zapateador con zapateador como algo que podemos aplicar a nuestra vida...
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Mapping a New Museum, 2021
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Mapping a New Museum, 2021
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Signata, 2020
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Revista Acta Semiotica
This work departs from the opposition between continuity and discontinuity as formulated by semio... more This work departs from the opposition between continuity and discontinuity as formulated by semiotician Eric Landowski. I argue that the opposition is a complex that can be fruitfully analysed in terms of self-identity vs difference, unity vs diversity and determinism vs pure randomness. The study of these oppositions deploying Greimas’s square provides an insight into the notions of difference, boundary and cohesion. These will be key to the formulation of a semiotic concept of Harmony as the interplay between a unifying and a diversifying force. Harmony, I claim, is the first step for the study of rhythm as a semiotic concept.
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This work presents a comparative study of techniques to classify four hand movements (flexion, ex... more This work presents a comparative study of techniques to classify four hand movements (flexion, extension, opening and closure) using myoelectric signals measured at the forearm in two separate channels: the brachioradialis and the flexor carpi ulnaris (FCU) muscle. The process of signal acquisition is described, as well as signal normalization, hybrid feature extraction and classification using two supervised learning techniques; i.e., backpropagation and support vector machines. The classifiers were trained using the raw data from the input signal. It was verified that the accuracy of the classification is improved by feature extraction up to 2.25%, yielding a successful average classification rate of 91.00%.
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Contrapunto de zapateo criollo: La tradición de crear e improvisar, 2021
Este es un documento histórico en el sentido de nunca antes realizado. Somos 8 autores, 7 de los ... more Este es un documento histórico en el sentido de nunca antes realizado. Somos 8 autores, 7 de los cuales son maestros destacados del zapateo criollo de contrapunto, conocido por algunos como zapateo afroperuano. Esta monografía sirve como un mapa para ubicar el desarrollo del zapateo y algunos aspectos importantes de su práctica. Es el resultado de varias reuniones en conjunto de los autores, y lo consideramos como un punto de partida importante para posteriores investigaciones.
El documento tiene el carácter de una monografía redactada para el proyecto "Estudio de las Estructuras de Movimiento del Zapateo de Contrapunto Criollo", ganador de los fondos de las líneas de Apoyos Económicos del Ministerio de Cultura del Perú.
Autores:
Juan Felipe Miranda Medina
José Orlando Izquierdo Fune
Luis Alberto Casanova Lazarte
Theddy Cruz Lobatón Beltrán
Luis Alberto Sandoval Zapata
Percy Alberto Martin Chinchilla Villanueva
Luis Antonio Vilchez Vargas
Hector Renan Arévalo Robles
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The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet ... more The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet it seems to have received little attention. Modes of existence can be used in different senses. For Greimas, from the perspective of narrative semiotics, when Michelangelo first receives a block of marble and decides to sculpt the David, his intention is in a virtual mode; as Michelangelo progresses he ends up bringing the David into existence, and his intention comes to the realized mode. In Fontanille’s tensive semiotics, however, modes of existence can have to do with how one can narrow or broaden the scope of our apprehension of the David as our eyes look at it in order to produce a meaningful experience. In this work, the perspectives of narrative and tensive semiotics are contrasted both theoretically and practically applying both to a number of examples. In order to identify all possible modes of existence and all the possibilities of transitioning from one to the other in the exa...
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Public Journal of Semiotics
The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet ... more The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet it seems to have received little attention. Modes of existence can be used in different senses. For Greimas, from the perspective of narrative semiotics, when Michelangelo first receives a block of marble and decides to sculpt the David, his intention is in a virtual mode; as Michelangelo progresses he ends up bringing the David into existence, and his intention comes to the realized mode. In Fontanille’s tensive semiotics, however, modes of existence can have to do with how one can narrow or broaden the scope of our apprehension of the David as our eyes look at it in order to produce a meaningful experience. In this work, the perspectives of narrative and tensive semiotics are contrasted both theoretically and practically applying both to a number of examples. In order to identify all possible modes of existence and all the possibilities of transitioning from one to the other in the exa...
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Academia Letters, 2021
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Signata. Annales des sémiotiques/Annals of Semiotics, 2020
This work presents to dance and music scholarship the concept of competence, developed and deploy... more This work presents to dance and music scholarship the concept of competence, developed and deployed by Greimas, together with the semiotic concepts of counterpoint and harmony. I emphasize competence as a temporal process that requires sanction by an external entity and which corresponds to the level of surface narrative syntax within Greimas’s method of ‘generative trajectory’. To exemplify the application of the generative trajectory to dance, I present the case of the contrapunto de zapateo from Peru. In this step dance, two or more dancers take turns and perform for an audience who claps and cheers for them and upon whom depends the appreciation of their competence. To better account for the complex relations between all actors of the contrapunto, I resort to the concept of semiotic counterpoint, which is first explained by means of input–output boxes, inspired by black box modeling in engineering. Counterpoint is also represented using equations, especially to address memory/retention and prediction/protention, with a subsequent discussion of its relevance and articulation to Greimas’s semiotics. Finally, I complement counterpoint with Leibniz’s definition of harmony and Spinoza’s principle of maximization of action, in order to account for different kinds of fluent interactions between dancers, arguing for its application not only to the contrapunto de zapateo, but also to dances such as Capoeira, breakdancing, and contact improvisation.
ARTICLE AVAILABLE AT THE JOURNAL PAGE: https://journals.openedition.org/signata/2655
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Rethinking Knowledge-that and Knowledge-how: Performance, Information and Feedback, 2020
DOWNLOAD ORIGINAL PUBLICATION HERE: http://www.studia.ubbcluj.ro/download/pdf/1340.pdf This wor... more DOWNLOAD ORIGINAL PUBLICATION HERE: http://www.studia.ubbcluj.ro/download/pdf/1340.pdf
This work approaches the distinction between knowledge-how and knowledge-that in terms of two complementary concepts: performance and information. In order to do so, I formulate Ryle's argument of infinite regress in terms of performance in order to show that Stanley and Williamson's counterargument has no real object: both reject the view that the exercise of knowledge-that necessarily requires the previous consideration of propositions. Next comes perhaps the most valuable import of this work: using the concept of feedback, I argue that Stanley and Williamson's positive account of knowledge-how in terms of knowledge-that corresponds to the output of the comparison between an intention of action and the perceived outcome of performance. Then, I expound other theories of mind and cognition in which feedback and prediction play a fundamental role in order to explain other ways in which information intervenes in performance-i.e., information is construed as knowledge-that available at subject level that guides performance. Finally, I present some reflections on the impact of the concept of knowledge-how, and possible routes to continue our enquiry on the nature of knowledge.
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Public Journal of Semiotics, Jan 8, 2021
The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet ... more The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet it seems to have received little attention. Modes of existence can be used in different senses. For Greimas, from the perspective of narrative semiotics, when Michelangelo first receives a block of marble and decides to sculpt the David, his intention is in a virtual mode; as Michelangelo progresses he ends up bringing the David into existence, and his intention comes to the realized mode. In Fontanille's tensive semiotics, however, modes of existence can have to do with how one can narrow or broaden the scope of our apprehension of the David as our eyes look at it in order to produce a meaningful experience. In this work, the perspectives of narrative and tensive semiotics are contrasted both theoretically and practically applying both to a number of examples. In order to identify all possible modes of existence and all the possibilities of transitioning from one to the other in the examples presented, we resort to the method of finite-state automata from computer science. In the end, we propose a robust narrative account of modes of existence that relies on narrative semiotics for its definition, but into which intent and apprehension from tensive semiotics can be integrated. This work calls for the need of establishing a syntax of modes of existence, since both Greimas and Fontanille construe them as being necessary to account for the production of signification.
Available at: https://journals.lub.lu.se/pjos/article/view/22417?fbclid=IwAR2SngPnASqm9pIMxoZVS5Xg2sftaQBh2VhomeljlfwroY-iJd7AaibGUp0
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Ministerio de Cultura del Perú, 2022
Este capítulo corresponde a la ponencia titutada "Victoria Santa Cruz y la Filosofía del Ritmo" p... more Este capítulo corresponde a la ponencia titutada "Victoria Santa Cruz y la Filosofía del Ritmo" presentada el 11 de Julio del 2020 en el IV Encuentro de Investigaciones sobre Cultura Afroperuana organizado por el Ministerio de Cultura del Perú. Si bien en mi ponencia me esforcé en poner en diálogo a Victoria Santa Cruz con filósofos de la tradición occidental como Platón, Descartes y Spinoza, este capítulo procura ser más bien un comentario a las reflexiones filosóficas que Victoria plantea en su libro "Ritmo: El Eterno Organizador". Espero contribuya a generar interés por el pensamiento de Victoria Santa Cruz, que como se verá en estas páginas va siempre acompañado de la acción trasnformadora.
CÓMO CITAR/HOW TO CITE:
* APA:
Miranda Medina, J. F. (2022). "Victoria Santa Cruz: Ritmo, Acción, Transformación." En Cultura afroperuana: encuentro de investigadores 2020. Perú, Ministerio de Cultura. pp. 323-345. https://poblacionafroperuana.cultura.pe/sites/default/files/encuentro_de_investigadores_2020_en_baja.pdf
* MLA:
Miranda Medina, Juan Felipe. "Victoria Santa Cruz: Ritmo, Acción, Transformación." Cultura afroperuana: encuentro de investigadores 2020. Editado por Perú, Ministerio de Cultura, 2022, pp. 323-345. https://poblacionafroperuana.cultura.pe/sites/default/files/encuentro_de_investigadores_2020_en_baja.pdf
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Poema escrito por el poeta peruano Alejandro Romualdo
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Abstract — A novel dynamic biasing methodology specially oriented towards high-efficiency class... more Abstract — A novel dynamic biasing methodology specially oriented towards high-efficiency class-A/AB design is presented. To achieve flexibility in the efficiency/linearity tradeoff, the gate and drain voltages as well as the input power are varied as a function of the desired output power. The aim is Power Added Efficiency (PAE) maximization restrained by linearity conditions. Simulation results for a 30dBm GaAs pHEMT amplifier yielded gain levels between 10.5 and 11dB for the whole power range, phase variation limited to 2.6° only. The PAE was found to be 25% in average over the dynamic range. This is three times as large as the static bias case. The second and third harmonic vary from -58dBc to -25dBc and -62dBc to -42dBc respectively hence preserving linear behavior.
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A novel algorithm for class-A/AB power amplifiers (PA) enhancement is fully described. The princi... more A novel algorithm for class-A/AB power amplifiers (PA) enhancement is fully described. The principle is to find a combination of base current (gate voltage), collector voltage (drain voltage) and input power for each output power level so that the linearity/efficiency specifications of the application are satisfied. Based on a 1- tone static characterization of the amplifier, the algorithm uses a
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The "landó" in Peru is considered to be sensual, musically interesting and complex to perform. Th... more The "landó" in Peru is considered to be sensual, musically
interesting and complex to perform. This work presents a new insight
into the "landó" using different metrics taken from the fields of computer
science and mathematics. These measures attempt to quantify musical
concepts such as rhythmic complexity, syncopation, and regularity. In
addition, a measure based on the Fourier transform is proposed as a
rhythmic regularity measure.
During the Afro-Peruvian revival the "landó" suffered a period of styliza-
tion that started in the 1950s and culminated in the 1970s. The three
drum patterns that became representative for the "landó" are compared
to the one used in the first "landó" ever recorded, "Samba Malató". The
use of phylogenetic trees supports the uncertain history behind the
"landó", since none of these four rhythms seems to be the ancestor or
progenitor of all the others. Nevertheless, this might open possibilities
for further research including musical transcriptions of old recordings,
which could also be analyzed using the methods discussed in this article.
Bookmarks Related papers MentionsView impact
"Opera seria" can be understood as a collective artistic manifestation that influenced and was in... more "Opera seria" can be understood as a collective artistic manifestation that influenced and was influenced by the ideologies of its time. This work focuses not on its history but on the philosophy behind the librettos, as well as the essence of the arias and recitatives, and the social congregation and interaction that seria represented.
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Este capítulo presenta una mirada hacia la historia del renacimiento afroperuano en paralelo con ... more Este capítulo presenta una mirada hacia la historia del renacimiento afroperuano en paralelo con la historia del contrapunto de zapateo criollo, una de las prácticas que más destacó el renacimiento. Enfatizando en las nociones de ruptura y acontecimiento del filósofo francés Alain Badiou, se examinan ambos como rupturas que constituyen una nueva historia. En el caso específico del contrapunto esta ruptura está dada por la transición de ser un concurso a ser una práctica escénica. Este documento es el primero en enumerar, hasta donde tengo conocimiento, los cambios fundamentales que esta transición implica: ya no hay un juez, el público cobra un rol fundamental, intervienen más de dos zapateadores, se cierra con una coreografía común. El hecho de que no haya un juez que determine un ganador sella el carácter dialéctico del contrapunto de zapateo escénico. Estas páginas buscan rescatar ese interacción dialéctica de zapateador con zapateador como algo que podemos aplicar a nuestra vida...
Bookmarks Related papers MentionsView impact
Mapping a New Museum, 2021
Bookmarks Related papers MentionsView impact
Mapping a New Museum, 2021
Bookmarks Related papers MentionsView impact
Signata, 2020
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Revista Acta Semiotica
This work departs from the opposition between continuity and discontinuity as formulated by semio... more This work departs from the opposition between continuity and discontinuity as formulated by semiotician Eric Landowski. I argue that the opposition is a complex that can be fruitfully analysed in terms of self-identity vs difference, unity vs diversity and determinism vs pure randomness. The study of these oppositions deploying Greimas’s square provides an insight into the notions of difference, boundary and cohesion. These will be key to the formulation of a semiotic concept of Harmony as the interplay between a unifying and a diversifying force. Harmony, I claim, is the first step for the study of rhythm as a semiotic concept.
Bookmarks Related papers MentionsView impact
This work presents a comparative study of techniques to classify four hand movements (flexion, ex... more This work presents a comparative study of techniques to classify four hand movements (flexion, extension, opening and closure) using myoelectric signals measured at the forearm in two separate channels: the brachioradialis and the flexor carpi ulnaris (FCU) muscle. The process of signal acquisition is described, as well as signal normalization, hybrid feature extraction and classification using two supervised learning techniques; i.e., backpropagation and support vector machines. The classifiers were trained using the raw data from the input signal. It was verified that the accuracy of the classification is improved by feature extraction up to 2.25%, yielding a successful average classification rate of 91.00%.
Bookmarks Related papers MentionsView impact
Contrapunto de zapateo criollo: La tradición de crear e improvisar, 2021
Este es un documento histórico en el sentido de nunca antes realizado. Somos 8 autores, 7 de los ... more Este es un documento histórico en el sentido de nunca antes realizado. Somos 8 autores, 7 de los cuales son maestros destacados del zapateo criollo de contrapunto, conocido por algunos como zapateo afroperuano. Esta monografía sirve como un mapa para ubicar el desarrollo del zapateo y algunos aspectos importantes de su práctica. Es el resultado de varias reuniones en conjunto de los autores, y lo consideramos como un punto de partida importante para posteriores investigaciones.
El documento tiene el carácter de una monografía redactada para el proyecto "Estudio de las Estructuras de Movimiento del Zapateo de Contrapunto Criollo", ganador de los fondos de las líneas de Apoyos Económicos del Ministerio de Cultura del Perú.
Autores:
Juan Felipe Miranda Medina
José Orlando Izquierdo Fune
Luis Alberto Casanova Lazarte
Theddy Cruz Lobatón Beltrán
Luis Alberto Sandoval Zapata
Percy Alberto Martin Chinchilla Villanueva
Luis Antonio Vilchez Vargas
Hector Renan Arévalo Robles
Bookmarks Related papers MentionsView impact
The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet ... more The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet it seems to have received little attention. Modes of existence can be used in different senses. For Greimas, from the perspective of narrative semiotics, when Michelangelo first receives a block of marble and decides to sculpt the David, his intention is in a virtual mode; as Michelangelo progresses he ends up bringing the David into existence, and his intention comes to the realized mode. In Fontanille’s tensive semiotics, however, modes of existence can have to do with how one can narrow or broaden the scope of our apprehension of the David as our eyes look at it in order to produce a meaningful experience. In this work, the perspectives of narrative and tensive semiotics are contrasted both theoretically and practically applying both to a number of examples. In order to identify all possible modes of existence and all the possibilities of transitioning from one to the other in the exa...
Bookmarks Related papers MentionsView impact
Public Journal of Semiotics
The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet ... more The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet it seems to have received little attention. Modes of existence can be used in different senses. For Greimas, from the perspective of narrative semiotics, when Michelangelo first receives a block of marble and decides to sculpt the David, his intention is in a virtual mode; as Michelangelo progresses he ends up bringing the David into existence, and his intention comes to the realized mode. In Fontanille’s tensive semiotics, however, modes of existence can have to do with how one can narrow or broaden the scope of our apprehension of the David as our eyes look at it in order to produce a meaningful experience. In this work, the perspectives of narrative and tensive semiotics are contrasted both theoretically and practically applying both to a number of examples. In order to identify all possible modes of existence and all the possibilities of transitioning from one to the other in the exa...
Bookmarks Related papers MentionsView impact
Academia Letters, 2021
Bookmarks Related papers MentionsView impact
Signata. Annales des sémiotiques/Annals of Semiotics, 2020
This work presents to dance and music scholarship the concept of competence, developed and deploy... more This work presents to dance and music scholarship the concept of competence, developed and deployed by Greimas, together with the semiotic concepts of counterpoint and harmony. I emphasize competence as a temporal process that requires sanction by an external entity and which corresponds to the level of surface narrative syntax within Greimas’s method of ‘generative trajectory’. To exemplify the application of the generative trajectory to dance, I present the case of the contrapunto de zapateo from Peru. In this step dance, two or more dancers take turns and perform for an audience who claps and cheers for them and upon whom depends the appreciation of their competence. To better account for the complex relations between all actors of the contrapunto, I resort to the concept of semiotic counterpoint, which is first explained by means of input–output boxes, inspired by black box modeling in engineering. Counterpoint is also represented using equations, especially to address memory/retention and prediction/protention, with a subsequent discussion of its relevance and articulation to Greimas’s semiotics. Finally, I complement counterpoint with Leibniz’s definition of harmony and Spinoza’s principle of maximization of action, in order to account for different kinds of fluent interactions between dancers, arguing for its application not only to the contrapunto de zapateo, but also to dances such as Capoeira, breakdancing, and contact improvisation.
ARTICLE AVAILABLE AT THE JOURNAL PAGE: https://journals.openedition.org/signata/2655
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Rethinking Knowledge-that and Knowledge-how: Performance, Information and Feedback, 2020
DOWNLOAD ORIGINAL PUBLICATION HERE: http://www.studia.ubbcluj.ro/download/pdf/1340.pdf This wor... more DOWNLOAD ORIGINAL PUBLICATION HERE: http://www.studia.ubbcluj.ro/download/pdf/1340.pdf
This work approaches the distinction between knowledge-how and knowledge-that in terms of two complementary concepts: performance and information. In order to do so, I formulate Ryle's argument of infinite regress in terms of performance in order to show that Stanley and Williamson's counterargument has no real object: both reject the view that the exercise of knowledge-that necessarily requires the previous consideration of propositions. Next comes perhaps the most valuable import of this work: using the concept of feedback, I argue that Stanley and Williamson's positive account of knowledge-how in terms of knowledge-that corresponds to the output of the comparison between an intention of action and the perceived outcome of performance. Then, I expound other theories of mind and cognition in which feedback and prediction play a fundamental role in order to explain other ways in which information intervenes in performance-i.e., information is construed as knowledge-that available at subject level that guides performance. Finally, I present some reflections on the impact of the concept of knowledge-how, and possible routes to continue our enquiry on the nature of knowledge.
Bookmarks Related papers MentionsView impact
Public Journal of Semiotics, Jan 8, 2021
The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet ... more The concept of modes of existence of semiotic entities underlies (post)Greimasian semiotics, yet it seems to have received little attention. Modes of existence can be used in different senses. For Greimas, from the perspective of narrative semiotics, when Michelangelo first receives a block of marble and decides to sculpt the David, his intention is in a virtual mode; as Michelangelo progresses he ends up bringing the David into existence, and his intention comes to the realized mode. In Fontanille's tensive semiotics, however, modes of existence can have to do with how one can narrow or broaden the scope of our apprehension of the David as our eyes look at it in order to produce a meaningful experience. In this work, the perspectives of narrative and tensive semiotics are contrasted both theoretically and practically applying both to a number of examples. In order to identify all possible modes of existence and all the possibilities of transitioning from one to the other in the examples presented, we resort to the method of finite-state automata from computer science. In the end, we propose a robust narrative account of modes of existence that relies on narrative semiotics for its definition, but into which intent and apprehension from tensive semiotics can be integrated. This work calls for the need of establishing a syntax of modes of existence, since both Greimas and Fontanille construe them as being necessary to account for the production of signification.
Available at: https://journals.lub.lu.se/pjos/article/view/22417?fbclid=IwAR2SngPnASqm9pIMxoZVS5Xg2sftaQBh2VhomeljlfwroY-iJd7AaibGUp0
Bookmarks Related papers MentionsView impact
Ministerio de Cultura del Perú, 2022
Este capítulo corresponde a la ponencia titutada "Victoria Santa Cruz y la Filosofía del Ritmo" p... more Este capítulo corresponde a la ponencia titutada "Victoria Santa Cruz y la Filosofía del Ritmo" presentada el 11 de Julio del 2020 en el IV Encuentro de Investigaciones sobre Cultura Afroperuana organizado por el Ministerio de Cultura del Perú. Si bien en mi ponencia me esforcé en poner en diálogo a Victoria Santa Cruz con filósofos de la tradición occidental como Platón, Descartes y Spinoza, este capítulo procura ser más bien un comentario a las reflexiones filosóficas que Victoria plantea en su libro "Ritmo: El Eterno Organizador". Espero contribuya a generar interés por el pensamiento de Victoria Santa Cruz, que como se verá en estas páginas va siempre acompañado de la acción trasnformadora.
CÓMO CITAR/HOW TO CITE:
* APA:
Miranda Medina, J. F. (2022). "Victoria Santa Cruz: Ritmo, Acción, Transformación." En Cultura afroperuana: encuentro de investigadores 2020. Perú, Ministerio de Cultura. pp. 323-345. https://poblacionafroperuana.cultura.pe/sites/default/files/encuentro_de_investigadores_2020_en_baja.pdf
* MLA:
Miranda Medina, Juan Felipe. "Victoria Santa Cruz: Ritmo, Acción, Transformación." Cultura afroperuana: encuentro de investigadores 2020. Editado por Perú, Ministerio de Cultura, 2022, pp. 323-345. https://poblacionafroperuana.cultura.pe/sites/default/files/encuentro_de_investigadores_2020_en_baja.pdf
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Poema escrito por el poeta peruano Alejandro Romualdo
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Abstract — A novel dynamic biasing methodology specially oriented towards high-efficiency class... more Abstract — A novel dynamic biasing methodology specially oriented towards high-efficiency class-A/AB design is presented. To achieve flexibility in the efficiency/linearity tradeoff, the gate and drain voltages as well as the input power are varied as a function of the desired output power. The aim is Power Added Efficiency (PAE) maximization restrained by linearity conditions. Simulation results for a 30dBm GaAs pHEMT amplifier yielded gain levels between 10.5 and 11dB for the whole power range, phase variation limited to 2.6° only. The PAE was found to be 25% in average over the dynamic range. This is three times as large as the static bias case. The second and third harmonic vary from -58dBc to -25dBc and -62dBc to -42dBc respectively hence preserving linear behavior.
Bookmarks Related papers MentionsView impact
A novel algorithm for class-A/AB power amplifiers (PA) enhancement is fully described. The princi... more A novel algorithm for class-A/AB power amplifiers (PA) enhancement is fully described. The principle is to find a combination of base current (gate voltage), collector voltage (drain voltage) and input power for each output power level so that the linearity/efficiency specifications of the application are satisfied. Based on a 1- tone static characterization of the amplifier, the algorithm uses a
Bookmarks Related papers MentionsView impact
The "landó" in Peru is considered to be sensual, musically interesting and complex to perform. Th... more The "landó" in Peru is considered to be sensual, musically
interesting and complex to perform. This work presents a new insight
into the "landó" using different metrics taken from the fields of computer
science and mathematics. These measures attempt to quantify musical
concepts such as rhythmic complexity, syncopation, and regularity. In
addition, a measure based on the Fourier transform is proposed as a
rhythmic regularity measure.
During the Afro-Peruvian revival the "landó" suffered a period of styliza-
tion that started in the 1950s and culminated in the 1970s. The three
drum patterns that became representative for the "landó" are compared
to the one used in the first "landó" ever recorded, "Samba Malató". The
use of phylogenetic trees supports the uncertain history behind the
"landó", since none of these four rhythms seems to be the ancestor or
progenitor of all the others. Nevertheless, this might open possibilities
for further research including musical transcriptions of old recordings,
which could also be analyzed using the methods discussed in this article.
Bookmarks Related papers MentionsView impact
"Opera seria" can be understood as a collective artistic manifestation that influenced and was in... more "Opera seria" can be understood as a collective artistic manifestation that influenced and was influenced by the ideologies of its time. This work focuses not on its history but on the philosophy behind the librettos, as well as the essence of the arias and recitatives, and the social congregation and interaction that seria represented.
Bookmarks Related papers MentionsView impact
Contrapunto de zapateo - Peru - Antonio Vilchez y Percy Chinchilla, 2016
This is a historical event that took place the 22nd of August 2016 at the "Peña" ("musical house"... more This is a historical event that took place the 22nd of August 2016 at the "Peña" ("musical house") of José "Pepe" Villalobos Cavero, in Lima-Peru. Zapateo masters Antonio Vilchez and Percy Chinchilla, both acknowledged as foremost figures of Peruvian zapateo (corporal percussive) dancing both at a national and international level, meet in this occasion for a "contrapunto" (a "battle"). The contrapunto begins with a rhythm rarely used for dancing today, the "Aguenieve", and continues with the guitar pattern in a major scaled to which we are most accustomed today.
While this kind of zapateo, referred to as "criollo" or Afro-Peruvian, may be found as a number in shows or concerts, it is very rarely that two zapateadores (dancers) meet exclusively to perform the dance, and even more rare that the length of the performance comes close to 20 minutes.
This encounter was the result of the dancers' kind colaboration to the ongoing research project of Juan Miranda in his research on Afro-Peruvian tap dancing, who is also responsible for the modest filming of this video.
My most sincere gratitude to masters Percy and Antonio!
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Chincha, a small town two hours away from Lima, Peru's capital, became the symbol for Africanity ... more Chincha, a small town two hours away from Lima, Peru's capital, became the symbol for Africanity during the later stage of the Afro-Peruvian revival. I took a trip there in 2013 for the celebration of the "Criollo Song"*. Though the party which I expected to reflect a re-invention of the Peruvian-African heritage, was more focused towards Cuban salsa and caribean rhythms. Nevertheless, next day I very much enjoyed this show at the house of the Ballumbrosio family, who usually lead the "Hatajo de Negritos" - a sort of parade for the Virgin of El Carmen in Christmass time - and who have pride in continuing to disseminate Afro-Peruvian music. The show was directed by Maribel Ballumbrosio, and recorded by myself. I hope you enjoy it!
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This is a little known "festejo" (music genre symbol of the Afro-Peruvian reinassance that starte... more This is a little known "festejo" (music genre symbol of the Afro-Peruvian reinassance that started in the 50s). It was recorded in San Luis de Cañete, as sung by master José Eduardo "Lalo" Izquierdo, one of the co-founders of Peru Negro (arguably the most influencial dance theatre group in Peruvian history).
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The cajon is a wooden box that eventually became a drum. In Peru, this instrument slowly became t... more The cajon is a wooden box that eventually became a drum. In Peru, this instrument slowly became the symbol of renewed Africanity and "Criollism" (a word that represents the indian-Spanish cultural fusion). This documentary approaches the instrument from the eyes of representative Peruvian musicians, and narrates the instrument's history. The documentary was produced in the 70s, and was translated by me.
Feel free to approach me with questions or suggestions.
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This performance was recorded in Chincha-Peru, at the home of the Ballumbrosio family, well known... more This performance was recorded in Chincha-Peru, at the home of the Ballumbrosio family, well known for their tap-dancing tradition that remotes to the patriarc of the family, Amador Ballumbrosio. In this recording it is Amador's grandchildren that performe, conducted by one of Amador's daughters, Maribel Ballumbrosio.
The recording was taken the 1st of November, 2013.
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The Afro-Peruvian revival launched the contrapunto de zapateo to the stage, adding at the end a c... more The Afro-Peruvian revival launched the contrapunto de zapateo to the stage, adding at the end a common choreography. Before the contrapunto consisted of the dancers taking turns dancing one at a time, with a guitar playing in the background, using step dancing and body percussion. During and in between their turns the dancers continuously exchange gestures among themselves and with the audience—sometimes with the gaze, or a smile, others with mockery and ludic gestuality. How can such varied possibility of relations between the dancers, the guitarist and the audience be described?
Informed by my knowledge of zapateo as a dancer, and by my fieldwork in July 2016, in this work I carry out a semiotic analysis of a corpus of videos of contrapuntos available online. My theoretical method engages with the sign from a processual perspective, where a process is operationally defined as input–function–output, as is common practice in engineering. On the other hand, Greimas’s ‘generative trajectory’ is combined with principles from his Semiotics of Passions: starting at the level of discourse (composed by actors, actions, space and time), followed by the narrative level (identifying typical narrative structures and modalities), I arrive at the deep level, which accounts for the fundamental states of interaction between actors. Whereas I hypothesized that these would be founded on competition-collaboration; the analysis revealed a fundamental opposition between challenge (which occurs when the dancers take turns) and ‘moving together’ in a common choreography. The intensities and qualities of interaction between all actors are described as arising from a force of projection encountering a force of convergence. Play, ever present along the performance, is approached from Caillois’ distinction between ludus and paidia and Bateson’s semiotic and logic account of play.
This work will hopefully demonstrate that semiotics, as an espistemological method, has much in common with engineering in the sense of problem systematization into processes, and that both have a great potential for contributing to the field of dance.
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![Research paper thumbnail of El Renacimiento Afroperuano y el Renacer del Contrapunto [The Afro-Peruvian "Renacimiento" and the "Renacimiento" of the Contrapunto]](https://attachments.academia-assets.com/65721487/thumbnails/1.jpg)
](Cultura Afroperuana. Encuentro de Investigadores 2019, 2021
[FOR ENGLISH SCROLL DOWN] Este capítulo presenta una mirada hacia la historia del renacimiento af... more [FOR ENGLISH SCROLL DOWN]
Este capítulo presenta una mirada hacia la historia del renacimiento afroperuano en paralelo con la historia del contrapunto de zapateo criollo, una de las prácticas que más destacó el renacimiento. Enfatizando en las nociones de ruptura y acontecimiento del filósofo francés Alain Badiou, se examinan ambos como rupturas que constituyen una nueva historia. En el caso específico del contrapunto esta ruptura está dada por la transición de ser un concurso a ser una práctica escénica. Este documento es el primero en enumerar, hasta donde tengo conocimiento, los cambios fundamentales que esta transición implica: ya no hay un juez, el público cobra un rol fundamental, intervienen más de dos zapateadores, se cierra con una coreografía común. El hecho de que no haya un juez que determine un ganador sella el carácter dialéctico del contrapunto de zapateo escénico. Estas páginas buscan rescatar ese interacción dialéctica de zapateador con zapateador como algo que podemos aplicar a nuestra vida, en la relación que guardamos con los demás. Una relación simultáneamente de admiración, afecto y desafío para crecer.
ENGLISH:
This chapter presents a parallel of this history of the Afro-Peruvian revival or "renacimiento", as I would rather call it, and the history of the "contrapunto de zapateo", a step dance that unfolds as a "battle" or relationship of challenge. Emphasizing the concepts of Rupture and Event propposed by French philosopher Alain Badiou, I examine both as ruptures that constitute new histories. In the specific case of the Contrapunto, this rupture is given by the transition from being a contest to being a scenic practice. This document, to the best of my knowledge, is the first one to enumerate the fundamental changes that characterize this transition: there is no longer a judge, the audience thus plays a fundamental role, more than two dancers can partake, and the contrapunto closes with a common choreography. The fact that there is no longer a judge that rules for a winner, seals the dialectic nature of the stated contrapunto. Finally, these pages conclude revaluing the dialectic interaction between dancer and dancer as something that we can also apply to life in the relation that we uphold with others; a relationship that simultaneously involves admiration, affect and challenge in order to grow together.
CITE: Miranda Medina, Juan Felipe. El renacimiento afroperuano y el renacer del contrapunto [The Afro-Peruvian "renacimiento" and the "renacimiento" of the contrapunto]. In "Cultura Afroperuana. Encuentro de Investigadores 2019", Ministerio de Cultura. pp. 155-170.
FULL DOSSIER available for free at: https://centroderecursos.cultura.pe/es/registrobibliografico/cultura-afroperuana-encuentro-de-investigadores-2019
ISBN: 978-612-4391-32-3
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This is a transmedia project that provides a link between researchers and performers dancing zapa... more This is a transmedia project that provides a link between researchers and performers dancing zapateo. The output of the project is *the first* documentary series dedicated exclusively to Afro-Peruvian zapateo, featuring several of the most representative dancers. It also edits and displays audiovisual material contributed by the performers themselves.
Academic research is focused towards gathering and curating material of performances, interviews and information related to zapateo, which is accessible to all public. The project is scalable in that new material is released as we continue filming, but also in the sense that we progressively involve the zapateo community to send their own material and presenting their own work and understanding of zapateo. This project is affiliated to the SDCELAR of the British Museum.
Webpage available here: https://www.sdcelarbritishmuseum.org/contrapunto-a-documentary-on-afro-peruvian-zapateo/
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