Chronicle of a lyric: vindication of rap as an instrument of social and political struggle

Un lírico es una persona hábil en hacer de una expresión estética, por lo general de la escritura, la manifestación de los sentimientos o emociones más íntimas del que él o ella es autor. En esta historia Liriko A.K.A (also known as) Rapsodia (Ivan Rojas Castilla) es el protagonista de un relato en el que él como artista del género urbano de música rap es el llamado a ser el que expresa, al mejor estilo de un lírico, por medio de versos y rimas, ya no en poesía sino en canción, un mensaje que nace del fondo de su sentir. Un sentir atravesado por dos grandes vigas: la primera, las vicisitudes que para sí mismo y para su núcleo familiar, le depara su lugar de origen, el proviene del barrio Pinares, una zona de la periferia del suroriente de Bogotá, en la localidad de San Cristóbal. Y la segunda es la lectura crítica que tiene que hacer precisamente de ese contexto del que emerge -del que de hecho extrae la materia prima para componer- en el que tiene que poner en una balanza distintas salidas a una realidad llena de asechanzas y escasas oportunidades. Rapso opta por utilizar su música, su cultura, como instrumento casi pedagógico para hacer un retrato fiel de su realidad. Por lógica consecuencia esta expresión se extrapola y conecta con los oídos de las masas que viven condiciones similares. Así, desde lo más underground, arranca una carrera artística y musical, que se convierte en una opción de vida para un joven citadino al que no le sobran recursos más que la pasión y la disciplina para salir adelante. Esta vocación le vale para cosechar poco a poco el reconocimiento por los méritos logrados de parte de quienes conforman su grupo, lo siguen o trabajan junto con él y también por el público y la comunidad. Así, un personaje tan sencillo como un rapero juega un doble papel como actor o líder positivo entre sus pares, sirviéndoles de ejemplo y mostrándoles un camino distinto, el del arte; y el de un abanderado de diferentes causas sociales como lo son la defensa de la tierra/ambiente, los trabajadores y la no violencia/paz. De esta manera, a través de esta historia se reivindica el rap como un instrumento de lucha social e inclusive política. En la estética del rap y desde luego en los temas de Liriko Rapsodia se encuentra un marcado carácter de consciencia/objeción sobre la continuidad de un modelo/sistema caduco que paradójicamente en este momento de la historia marcado por la apertura a un sinfín de posibilidades gracias a las tecnologías, se tambalea incapaz de resolver los conflictos en lo social, económico, ambiental y ahora más recientemente en la salud mental de la humanidad. La tarea de cuestionar y también de proponer recae sobre los líderes, personas capaces de expresar, de movilizar, de inquietar, de agitar el estado de las cosas. La buena noticia es que este personaje no es el único en su especie, el surgimiento de raperos como Iván no es producto de la casualidad. El trasfondo es la escena del hip-hop/rap un movimiento musical y cultural de gran diversidad, con un impacto global y gran acogida en nuestro medio local. No resta sino estar atentos y abrir bien la mente y los oídos, porque es cuestión de tiempo para que se termine de posicionar este artista y su estilo de música evolucionada, una de esas expresiones con las cuáles podemos creer en que como sociedad avanzamos hacia un mejor-estar.A lyricist is a person skilled in making an aesthetic expression, usually writing, the manifestation of the most intimate feelings or emotions of which he or she is the author. In this story Liriko AKA (also known as) Rhapsody (Ivan Rojas Castilla) is the protagonist of a story in which he as an artist of the urban genre of rap music is called to be the one who expresses, in the best lyrical style, through verses and rhymes, no longer in poetry but in song, a message that comes from the depths of his feelings. A feeling crossed by two great beams: the first, the vicissitudes that his place of origin holds for himself and for his family nucleus, he comes from the Pinares neighborhood, an area on the outskirts of the southeastern part of Bogotá, in the town of San Cristobal. And the second is the critical reading that he has to do precisely from that context from which he emerges - from which in fact he extracts the raw material to compose - in which he has to weigh different outputs to a reality full of snares and few opportunities. . Rapso chooses to use his music, his culture, as an almost pedagogical instrument to make a faithful portrait of his reality. By logical consequence this expression is extrapolated and connects with the ears of the masses who live similar conditions. Thus, from the most underground, he starts an artistic and musical career, which becomes a life option for a young city man who has no resources other than passion and discipline to get ahead. This vocation is worth to him to gradually reap the recognition for the merits achieved on the part of those who make up his group, follow him or work together with him and also by the public and the community. Thus, a character as simple as a rapper plays a double role as an actor or positive leader among his peers, serving as an example and showing them a different path, that of art; and that of a champion of different social causes such as the defense of the land / environment, workers and non-violence / peace. In this way, through this history rap is vindicated as an instrument of social and even political struggle. In the aesthetics of rap and of course in the themes of Liriko Rapsodia, there is a marked character of conscience / objection about the continuity of an outdated model / system that paradoxically at this moment in history marked by the opening to endless possibilities thanks to the technologies, it staggers unable to resolve conflicts in the social, economic, environmental and now more recently in the mental health of humanity. The task of questioning and also proposing falls on leaders, people capable of expressing, mobilizing, disturbing, and shaking the state of things. The good news is that this character is not the only one of his kind, the emergence of rappers like Iván is not the product of chance. The background is the hip-hop / rap scene, a musical and cultural movement of great diversity, with a global impact and great reception in our local environment. It only remains to be attentive and open your mind and ears well, because it is a matter of time for this artist and his evolved style of music to finish positioning, one of those expressions with which we can believe that as a society we are moving towards a better-be

Real Time Flow Forecasting in a Mountain River Catchment Using Conceptual Models with Simple Error Correction Scheme

[EN] Methods in operational hydrology for real-time flash-flood forecasting need to be simple enough to match requirements of real-time system management. For this reason, hydrologic routing methods are widely used in river engineering. Among them, the popular Muskingum method is the most extended one, due to its simplicity and parsimonious formulation involving only two parameters. In the present application, two simple conceptual models with an error correction scheme were used. They were applied in practice to a mountain catchment located in the central Pyrenees (North of Spain), where occasional flash flooding events take place. Several relevant historical flood events have been selected for calibration and validation purposes. The models were designed to produce real-time predictions at the downstream gauge station, with variable lead times during a flood event. They generated accurate estimates of forecasted discharges at the downstream end of the river reach. For the validation data set and 2 h lead time, the estimated Nash-Sutcliffe coefficient was 0.970 for both models tested. The quality of the results, together with the simplicity of the formulations proposed, suggests an interesting potential for the practical use of these schemes for operational hydrology purposes.The authors wish to acknowledge support from Confederacion Hidrografica del Ebro.Montes, N.; Aranda Domingo, JÁ.; García-Bartual, R. (2020). Real Time Flow Forecasting in a Mountain River Catchment Using Conceptual Models with Simple Error Correction Scheme. Water. 12(5):1-18. https://doi.org/10.3390/w12051484S118125MORAMARCO, T., BARBETTA, S., MELONE, F., & SINGH, V. P. (2006). A real-time stage Muskingum forecasting model for a site without rating curve. Hydrological Sciences Journal, 51(1), 66-82. doi:10.1623/hysj.51.1.66Perumal, M., Moramarco, T., Barbetta, S., Melone, F., & Sahoo, B. (2011). Real-time flood stage forecasting by Variable Parameter Muskingum Stage hydrograph routing method. Hydrology Research, 42(2-3), 150-161. doi:10.2166/nh.2011.063Clark, C. O. (1945). Storage and the Unit Hydrograph. Transactions of the American Society of Civil Engineers, 110(1), 1419-1446. doi:10.1061/taceat.0005800Cunge, J. A. (1969). On The Subject Of A Flood Propagation Computation Method (Musklngum Method). Journal of Hydraulic Research, 7(2), 205-230. doi:10.1080/00221686909500264Dooge, J. C. I., Strupczewski, W. G., & Napiórkowski, J. J. (1982). Hydrodynamic derivation of storage parameters of the Muskingum model. Journal of Hydrology, 54(4), 371-387. doi:10.1016/0022-1694(82)90163-9Ponce, V. M., & Changanti, P. V. (1994). Variable-parameter Muskingum-Cunge method revisited. Journal of Hydrology, 162(3-4), 433-439. doi:10.1016/0022-1694(94)90241-0Ponce, V. M., & Theurer, F. D. (1983). Closure to « Accuracy Criteria in Diffusion Routing » by Victor Miguel Ponce and Fred D. Theurer (June, 1982). Journal of Hydraulic Engineering, 109(5), 806-807. doi:10.1061/(asce)0733-9429(1983)109:5(806)KUNDZEWICZ, Z. W. (1986). Physically based hydrological flood routing methods. Hydrological Sciences Journal, 31(2), 237-261. doi:10.1080/02626668609491042Singh, V. P., & Scarlatos, P. D. (1987). Analysis of Nonlinear Muskingum Flood Routing. Journal of Hydraulic Engineering, 113(1), 61-79. doi:10.1061/(asce)0733-9429(1987)113:1(61)Perumal, M. (1992). Multilinear muskingum flood routing method. Journal of Hydrology, 133(3-4), 259-272. doi:10.1016/0022-1694(92)90258-wTang, X., Knight, D. W., & Samuels, P. G. (1999). Variable parameter Muskingum-Cunge method for flood routing in a compound channel. Journal of Hydraulic Research, 37(5), 591-614. doi:10.1080/00221689909498519Al-Humoud, J. M., & Esen, I. I. (2006). Approximate Methods for the Estimation of Muskingum Flood Routing Parameters. Water Resources Management, 20(6), 979-990. doi:10.1007/s11269-006-9018-2Todini, E. (2007). A mass conservative and water storage consistent variable parameter Muskingum-Cunge approach. Hydrology and Earth System Sciences, 11(5), 1645-1659. doi:10.5194/hess-11-1645-2007Brakensiek, D. L. (1963). Estimating coefficients for storage flood routing. Journal of Geophysical Research, 68(24), 6471-6474. doi:10.1029/jz068i024p06471Birkhead, A. L., & James, C. S. (2002). Muskingum river routing with dynamic bank storage. Journal of Hydrology, 264(1-4), 113-132. doi:10.1016/s0022-1694(02)00068-9Perumal, M., & Price, R. K. (2013). A fully mass conservative variable parameter McCarthy–Muskingum method: Theory and verification. Journal of Hydrology, 502, 89-102. doi:10.1016/j.jhydrol.2013.08.023O’DONNELL, T. (1985). A direct three-parameter Muskingum procedure incorporating lateral inflow. Hydrological Sciences Journal, 30(4), 479-496. doi:10.1080/02626668509491013Kshirsagar, M. M., Rajagopalan, B., & Lal, U. (1995). Optimal parameter estimation for Muskingum routing with ungauged lateral inflow. Journal of Hydrology, 169(1-4), 25-35. doi:10.1016/0022-1694(94)02670-7Yadav, B., Perumal, M., & Bardossy, A. (2015). Variable parameter McCarthy–Muskingum routing method considering lateral flow. Journal of Hydrology, 523, 489-499. doi:10.1016/j.jhydrol.2015.01.068PERUMAL, M. (1994). Hydrodynamic derivation of a variable parameter Muskingum method: 1. Theory and solution procedure. Hydrological Sciences Journal, 39(5), 431-442. doi:10.1080/02626669409492766Perumal, M., E., O., & Raju, K. G. R. (2001). Field Applications of a Variable-Parameter Muskingum Method. Journal of Hydrologic Engineering, 6(3), 196-207. doi:10.1061/(asce)1084-0699(2001)6:3(196)Perumal, M., & Sahoo, B. (2007). Applicability criteria of the variable parameter Muskingum stage and discharge routing methods. Water Resources Research, 43(5). doi:10.1029/2006wr004909Gill, M. A. (1978). Flood routing by the Muskingum method. Journal of Hydrology, 36(3-4), 353-363. doi:10.1016/0022-1694(78)90153-1Tung, Y. (1985). River Flood Routing by Nonlinear Muskingum Method. Journal of Hydraulic Engineering, 111(12), 1447-1460. doi:10.1061/(asce)0733-9429(1985)111:12(1447)Yoon, J., & Padmanabhan, G. (1993). Parameter Estimation of Linear and Nonlinear Muskingum Models. Journal of Water Resources Planning and Management, 119(5), 600-610. doi:10.1061/(asce)0733-9496(1993)119:5(600)Mohan, S. (1997). Parameter Estimation of Nonlinear Muskingum Models Using Genetic Algorithm. Journal of Hydraulic Engineering, 123(2), 137-142. doi:10.1061/(asce)0733-9429(1997)123:2(137)Luo, J., & Xie, J. (2010). Parameter Estimation for Nonlinear Muskingum Model Based on Immune Clonal Selection Algorithm. Journal of Hydrologic Engineering, 15(10), 844-851. doi:10.1061/(asce)he.1943-5584.0000244Kang, L., & Zhang, S. (2016). Application of the Elitist-Mutated PSO and an Improved GSA to Estimate Parameters of Linear and Nonlinear Muskingum Flood Routing Models. PLOS ONE, 11(1), e0147338. doi:10.1371/journal.pone.0147338Geem, Z. W. (2006). Parameter Estimation for the Nonlinear Muskingum Model Using the BFGS Technique. Journal of Irrigation and Drainage Engineering, 132(5), 474-478. doi:10.1061/(asce)0733-9437(2006)132:5(474)Chu, H.-J., & Chang, L.-C. (2009). Applying Particle Swarm Optimization to Parameter Estimation of the Nonlinear Muskingum Model. Journal of Hydrologic Engineering, 14(9), 1024-1027. doi:10.1061/(asce)he.1943-5584.0000070Barati, R. (2011). Parameter Estimation of Nonlinear Muskingum Models Using Nelder-Mead Simplex Algorithm. Journal of Hydrologic Engineering, 16(11), 946-954. doi:10.1061/(asce)he.1943-5584.0000379Karahan, H., Gurarslan, G., & Geem, Z. W. (2013). Parameter Estimation of the Nonlinear Muskingum Flood-Routing Model Using a Hybrid Harmony Search Algorithm. Journal of Hydrologic Engineering, 18(3), 352-360. doi:10.1061/(asce)he.1943-5584.0000608Chen, X. Y., Chau, K. W., & Busari, A. O. (2015). A comparative study of population-based optimization algorithms for downstream river flow forecasting by a hybrid neural network model. Engineering Applications of Artificial Intelligence, 46, 258-268. doi:10.1016/j.engappai.2015.09.010Latt, Z. Z. (2015). Application of Feedforward Artificial Neural Network in Muskingum Flood Routing: a Black-Box Forecasting Approach for a Natural River System. Water Resources Management, 29(14), 4995-5014. doi:10.1007/s11269-015-1100-1Niazkar, M., & Afzali, S. H. (2016). Application of New Hybrid Optimization Technique for Parameter Estimation of New Improved Version of Muskingum Model. Water Resources Management, 30(13), 4713-4730. doi:10.1007/s11269-016-1449-9Kucukkoc, I., & Zhang, D. Z. (2015). Integrating ant colony and genetic algorithms in the balancing and scheduling of complex assembly lines. The International Journal of Advanced Manufacturing Technology, 82(1-4), 265-285. doi:10.1007/s00170-015-7320-yBazargan, J., & Norouzi, H. (2018). Investigation the Effect of Using Variable Values for the Parameters of the Linear Muskingum Method Using the Particle Swarm Algorithm (PSO). Water Resources Management, 32(14), 4763-4777. doi:10.1007/s11269-018-2082-6Ehteram, M., Mousavi, S. F., Karami, H., Farzin, S., Singh, V. P., Chau, K., & El-Shafie, A. (2018). Reservoir operation based on evolutionary algorithms and multi-criteria decision-making under climate change and uncertainty. Journal of Hydroinformatics, 20(2), 332-355. doi:10.2166/hydro.2018.094Pei, J., Su, Y., & Zhang, D. (2016). Fuzzy energy management strategy for parallel HEV based on pigeon-inspired optimization algorithm. Science China Technological Sciences, 60(3), 425-433. doi:10.1007/s11431-016-0485-8SCHUMM, S. A. (1956). EVOLUTION OF DRAINAGE SYSTEMS AND SLOPES IN BADLANDS AT PERTH AMBOY, NEW JERSEY. Geological Society of America Bulletin, 67(5), 597. doi:10.1130/0016-7606(1956)67[597:eodsas]2.0.co;2Baláž, M., Danáčová, M., & Szolgay, J. (2010). On the use of the Muskingum method for the simulation of flood wave movements. Slovak Journal of Civil Engineering, 18(3), 14-20. doi:10.2478/v10189-010-0012-6Franchini, M., & Lamberti, P. (1994). A flood routing Muskingum type simulation and forecasting model based on level data alone. Water Resources Research, 30(7), 2183-2196. doi:10.1029/94wr00536Yadav, O. P., Singh, N., Goel, P. S., & Itabashi-Campbell, R. (2003). A Framework for Reliability Prediction During Product Development Process Incorporating Engineering Judgments. Quality Engineering, 15(4), 649-662. doi:10.1081/qen-120018396Weinmann, P. E., & Laurenson, E. M. (1979). Approximate Flood Routing Methods: A Review. Journal of the Hydraulics Division, 105(12), 1521-1536. doi:10.1061/jyceaj.0005329Nash, J. E., & Sutcliffe, J. V. (1970). River flow forecasting through conceptual models part I — A discussion of principles. Journal of Hydrology, 10(3), 282-290. doi:10.1016/0022-1694(70)90255-6Kitanidis, P. K., & Bras, R. L. (1980). Real-time forecasting with a conceptual hydrologic model: 2. Applications and results. Water Resources Research, 16(6), 1034-1044. doi:10.1029/wr016i006p01034Franchini, M., Bernini, A., Barbetta, S., & Moramarco, T. (2011). Forecasting discharges at the downstream end of a river reach through two simple Muskingum based procedures. Journal of Hydrology, 399(3-4), 335-352. doi:10.1016/j.jhydrol.2011.01.009Alhumoud, J., & Almashan, N. (2019). Muskingum Method with Variable Parameter Estimation. Mathematical Modelling of Engineering Problems, 6(3), 355-362. doi:10.18280/mmep.060306Yang, R., Hou, B., Xiao, W., Liang, C., Zhang, X., Li, B., & Yu, H. (2019). The applicability of real-time flood forecasting correction techniques coupled with the Muskingum method. Hydrology Research, 51(1), 17-29. doi:10.2166/nh.2019.12

Acerca de la necesidad de contar con aportes para comprender la movilización social: aportes de Doug McAdam, Sidney Tarrow y Charles Tilly

Sr. Editor. Analizar las diversas formas de acción colectiva significa un enorme desafío heurístico para cualquier investigador social. Sin duda, esto se debe en gran medida a la predominancia de marcos teóricos reduccionistas y a una serie de prejuicios que están presentes a la hora de estudiar la movilización social.&nbsp

Comentario a Alberto Vergara. Ni amnésicos ni irracionales: una mirada al electorado peruano a partir de las elecciones de 2006

Alberto Vergara es sin duda uno de los politólogos de vanguardia dentro del acotado campo de investigadores que alberga la ciencia política peruana. A lo largo de su obra, la pluma del autor pone en evidencia sus innegables capacidades intelectuales para conjugar o, mejor dicho, aplicar las teorías más abstractas a un caso empírico en concreto. En este análisis, Vergara toma como objeto de estudio las elecciones peruanas celebradas en el año 2006

Radiografía de una contienda transgresiva: Apuntes para un estudio de las protestas en Perú (2020)

El present article proposa un estudi del cicle de protestes ocorregut a Perú entre el nou i el disset de novembre de l’any 2020. En aquest sentit, la proposta de l’escrit s’emmarca en una anàlisi de l’acció col·lectiva que dialoga amb alguns dels paradigmes més importants del camp. D’aquesta manera, la investigació cristal·litza en tres qüestions fonamentals: (1) una preocupació per la gramàtica o la narrativa que gira a l’entorn del cicle de mobilització; (2) un exercici descriptiu d’allò ocorregut al llarg del cicle de protestes; (3) una possible explicació que tingui en compte la profunditat del problema plantejat.This article proposes a study of the cycle of protests that took place in Peru between November 9 and 17, 2020. In this sense, the proposal of the paper is framed in an analysis of collective action that dialogues with some of the most important paradigms of the field. In this way, the research crystallizes into three fundamental questions: (1) a concern with the grammar or narrative that revolves around the mobilization cycle, (2) a descriptive exercise of what happened throughout the protest cycle, (3) a possible explanation that takes into account the depth of the problem posedEl presente artículo propone un estudio del ciclo de protestas ocurrido en Perú entre el nueve y el diecisiete de noviembre del año 2020. En este sentido, la propuesta del escrito se enmarca en un análisis de la acción colectiva que dialoga con algunos de los paradigmas más importantes del campo. De este modo, la investigación se cristaliza en tres cuestiones fundamentales: (1) una preocupación por la gramática o la narrativa que gira en torno al ciclo de movilización, (2) un ejercicio descriptivo de lo sucedido a lo largo del ciclo de protestas, (3) una posible explicación que tome en cuenta la profundidad del problema plantead

A tensor optimization algorithm for Bézier Shape Deformation

In this paper we propose a tensor based description of the Bézier Shape Deformation (BSD) algorithm, denoted as T-BSD. The BSD algorithm is a well-known technique, based on the deformation of a Bézier curve through a field of vectors. A critical point in the use of real-time applications is the cost in computational time. Recently, the use of tensors in numerical methods has been increasing because they drastically reduce computational costs. Our formulation based in tensors T-BSD provides an efficient reformulation of the BSD algorithm. More precisely, the evolution of the execution time with respect to the number of curves of the BSD algorithm is an exponentially increasing curve. As the numerical experiments show, the T-BSD algorithm transforms this evolution into a linear one. This fact allows to compute the deformation of a Bézier with a much lower computational cost

Numerical strategies for the Galerkin–proper generalized decomposition method

The Proper Generalized Decomposition or, for short, PGD is a tensor decomposition based technique to solve PDE problems. It reduces calculation and storage cost drastically and presents some similarities with the Proper Orthogonal Decomposition, for short POD. In this work, we propose an efficient implementation to improve the convergence of the PGD, toward the numerical solution of a discretized PDE problem, when the associated matrix is Laplacian-like.The first author was partially supported by PRCEU-UCH 30/10 by Universidad CEU Cardenal Herrer

La captación de colesterol por Tetrahymena thermophila se realiza principalmente por fagocitosis

The free-living ciliate Tetrahymena thermophila is a unicellular model organism in which landmark biological processes have been discovered, such as the first description of telomerase activity and the molecular structure of telomeres, the mechanism of self-splicing RNA and ribozymes, the function of histone acetylation in transcription regulation and a number of pioneer experiments on the interference (RNAi) mechanism for programmed genome rearrangements, among others...Fil: Elguero, María Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Nanobiotecnología. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Nanobiotecnología; ArgentinaFil: Sánchez Granel, María Luz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Nanobiotecnología. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Nanobiotecnología; ArgentinaFil: Montes, María Guadalupe. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Nanobiotecnología. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Nanobiotecnología; ArgentinaFil: Cid, Nicolás Gonzalo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Nanobiotecnología. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Nanobiotecnología; ArgentinaFil: Favale, Nicolas Octavio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaFil: Nudel, Berta Clara. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Nanobiotecnología. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Nanobiotecnología; ArgentinaFil: Nusblat, Alejandro David. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Nanobiotecnología. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Nanobiotecnología; Argentin

On the Existence of a Progressive Variational Vademecum based on the Proper Generalized Decomposition for a Class of Elliptic Parameterized Problems

In this study, we present the mathematical analysis needed to explain the convergence of a progressive variational vademecum based on the proper generalized decomposition (PGD). The PGD is a novel technique that was developed recently for solving problems with high dimensions, and it also provides new approaches for obtaining the solutions of elliptic and parabolic problems via the abstract separation of variables method. This new scenario requires a mathematical framework in order to justify its application to the solution of numerical problems and the PGD can help in the change to this paradigm. The main aim of this study is to provide a mathematical environment for defining the notion of progressive variational vademecum. We prove the convergence of this iterative procedure and we also provide the first order optimality conditions in order to construct the numerical approximations of the parameterized solutions. In particular, we illustrate this methodology based on a robot path planning problem. This is one of the common tasks when designing the trajectory or path of a mobile robot. The construction of a progressive variational vademecum provides a novel methodology for computing all the possible paths from any start and goal positions derived from a harmonic potential field in a predefined map

Consideraciones sobre el voto electrónico

El voto electrónico es un tema que se ha instalado tanto en las agendas de gobierno (nacional, provincial y municipal) como en la opinión pública. Este trabajo discutimos algunas posibles definiciones de voto electrónico; analizamos algunas debilidades, tanto prácticas, según revelan algunas experiencias en el mundo, como teóricas; y postulamos una serie de requerimientos que a nuestro criterio debería cumplir cualquier sistema de este tipo.Sociedad Argentina de Informática e Investigación Operativa (SADIO