Innovations in the development of degree thesis of a informatics career. Cohorts 2003-2007.

Trabajo Final de Aplicación es una asignatura de las carreras Licenciatura en Sistemas y Licenciatura en Sistemas de Información (FACENA – UNNE). Tiene por objetivo general, completar la formación académica y profesional de los alumnos, a fin de fomentar la integración y empleo de los conocimientos adquiridos para la resolución de problemas. En este trabajo se sintetizan las innovaciones de la cátedra en las cohortes 2003 a 2007. La primera sección ilustra el contexto, la segunda resume la metodología aplicada. En la tercera se sintetizan los resultados alcanzados. Finalmente se enuncian las conclusiones y futuras líneas de trabajo.Trabajo Final de Aplicación is a subject of Licenciatura en Sistemas and Licenciatura en Sistemas de Información career (FACENA - UNNE). Its overall goal, completing the academic and professional training of students, to foster the integration and use of knowledge acquired in order to guide the problemsolving. This paper summarizes the implemented innovations between the years 2003 to 2007. The first section illustrates the context. The second section summarizes the methodology and the third section the results achieved. Finally, some conclusions and future lines of work are exposed

Multi-Instantons and Multi-Cuts

We discuss various aspects of multi-instanton configurations in generic multi-cut matrix models. Explicit formulae are presented in the two-cut case and, in particular, we obtain general formulae for multi-instanton amplitudes in the one-cut matrix model case as a degeneration of the two-cut case. These formulae show that the instanton gas is ultra-dilute, due to the repulsion among the matrix model eigenvalues. We exemplify and test our general results in the cubic matrix model, where multi-instanton amplitudes can be also computed with orthogonal polynomials. As an application, we derive general expressions for multi-instanton contributions in two-dimensional quantum gravity, verifying them by computing the instanton corrections to the string equation. The resulting amplitudes can be interpreted as regularized partition functions for multiple ZZ-branes, which take into full account their back-reaction on the target geometry. Finally, we also derive structural properties of the trans-series solution to the Painleve I equation.Comment: 34 pages, 3 figures, JHEP3.cls; v2: added references, minor changes; v3: added 1 reference, more minor changes, final version for JMP; v4: more typos correcte

Inferencias en el proceso de construcción y aplicación de una clave dicotómica. Un estudio preliminar.

En este trabajo se aborda una vinculación entre los métodos de inferencia y los procesos de identificación botánica, como reflejo la integración de la epistemología, la metodología de la investigación y la botánica. Se menciona la metodología aplicada en su desarrollo. Como producto de la investigación se vinculan la inducción, deducción, abducción y analogía, además de cómo se presentan tanto en el proceso de construcción como de aplicación de una clave dicotómica uno de los instrumentos de identificación ampliamente difundidos en el dominio de la botánica. Finalmente, se esbozan reflexiones preliminares.This paper deals with a connection between the methods of inference and botanical identification processes, reflecting the integration of epistemology, research methodology and botany. It mentions the methodology applied in its development. As a product of research, it is linked to induction, deduction, abduction and analogy, as well as to how it is presented in both the construction and application processesfor a dichotomous key, one of the widespread identification tools in the domain of botany. Finally, preliminary reflections are expounded.Fil: Mariño, Sonia I.. Universidad Nacional del Nordeste; Argentina;Fil: Dematteis, Massimiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Nordeste. Instituto de Botánica del Nordeste (i); Argentina; Universidad Nacional del Nordeste; Argentina

Preliminary reflections on the activity theory and the development of educational software

Se presenta una síntesis de la teoría de la actividad, para establecer el marco de referencia y sus posibles aportes en la ingeniería del software educativo. El trabajo se compone de cinco secciones. La primera, expone los fundamentos que sustentan el trabajo. La segunda resume consideraciones de la teoría de la actividad y de la ingeniería del software, enfocándose en el software educativo. En la tercera, la metodología aplicada para elaborar el trabajo. En la cuarta se exponen las aproximaciones propuestas, atendiendo al contexto socio cultural y la dialéctica hegeliana. Finalmente, se mencionan las conclusiones y futuras líneas de trabajo.The paper presents a synthesis of activity theory, considering the viewpoints from different authors. It attempts to set the framework and the potential contributions of that theory in software engineering education. This paper is composed of five sections which describe foundations of the work; summarize aspects of activity theory and software engineering as well as applied methodology; present the first approaches proposed to link the activity theory and the development of educational software, and finally mention the conclusions and future work lines

Transition to Chaotic Phase Synchronization through Random Phase Jumps

Phase synchronization is shown to occur between opposite cells of a ring consisting of chaotic Lorenz oscillators coupled unidirectionally through driving. As the coupling strength is diminished, full phase synchronization cannot be achieved due to random generation of phase jumps. The brownian dynamics underlying this process is studied in terms of a stochastic diffusion model of a particle in a one-dimensional medium.Comment: Accepted for publication in IJBC, 10 pages, 5 jpg figure

Phase transitions, double-scaling limit, and topological strings

Topological strings on Calabi--Yau manifolds are known to undergo phase transitions at small distances. We study this issue in the case of perturbative topological strings on local Calabi--Yau threefolds given by a bundle over a two-sphere. This theory can be regarded as a q--deformation of Hurwitz theory, and it has a conjectural nonperturbative description in terms of q--deformed 2d Yang--Mills theory. We solve the planar model and find a phase transition at small radius in the universality class of 2d gravity. We give strong evidence that there is a double--scaled theory at the critical point whose all genus free energy is governed by the Painlev\'e I equation. We compare the critical behavior of the perturbative theory to the critical behavior of its nonperturbative description, which belongs to the universality class of 2d supergravity. We also give evidence for a new open/closed duality relating these Calabi--Yau backgrounds to open strings with framing.Comment: 49 pages, 3 eps figures; section added on non-perturbative proposal and 2d gravity; minor typos correcte

Exact Results in ABJM Theory from Topological Strings

Recently, Kapustin, Willett and Yaakov have found, by using localization techniques, that vacuum expectation values of Wilson loops in ABJM theory can be calculated with a matrix model. We show that this matrix model is closely related to Chern-Simons theory on a lens space with a gauge supergroup. This theory has a topological string large N dual, and this makes possible to solve the matrix model exactly in the large N expansion. In particular, we find the exact expression for the vacuum expectation value of a 1/6 BPS Wilson loop in the ABJM theory, as a function of the 't Hooft parameters, and in the planar limit. This expression gives an exact interpolating function between the weak and the strong coupling regimes. The behavior at strong coupling is in precise agreement with the prediction of the AdS string dual. We also give explicit results for the 1/2 BPS Wilson loop recently constructed by Drukker and TrancanelliComment: 18 pages, two figures, small misprints corrected and references added, final version to appear in JHE

Dynamic clustering of time series with Echo State Networks

In this paper we introduce a novel methodology for unsupervised analysis of time series, based upon the iterative implementation of a clustering algorithm embedded into the evolution of a recurrent Echo State Network. The main features of the temporal data are captured by the dynamical evolution of the network states, which are then subject to a clustering procedure. We apply the proposed algorithm to time series coming from records of eye movements, called saccades, which are recorded for diagnosis of a neurodegenerative form of ataxia. This is a hard classification problem, since saccades from patients at an early stage of the disease are practically indistinguishable from those coming from healthy subjects. The unsupervised clustering algorithm implanted within the recurrent network produces more compact clusters, compared to conventional clustering of static data, and provides a source of information that could aid diagnosis and assessment of the disease.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec