Tracking moving optima using Kalman-based predictions

The dynamic optimization problem concerns finding an optimum in a changing environment. In the field of evolutionary algorithms, this implies dealing with a timechanging fitness landscape. In this paper we compare different techniques for integrating motion information into an evolutionary algorithm, in the case it has to follow a time-changing optimum, under the assumption that the changes follow a nonrandom law. Such a law can be estimated in order to improve the optimum tracking capabilities of the algorithm. In particular, we will focus on first order dynamical laws to track moving objects. A vision-based tracking robotic application is used as testbed for experimental comparison

Corte Penal Internacional. Un intento de justicia en un espacio público internacional.

En españolEl autor aborda ciertas particularidades de la historia y actualidad del Derecho Internacional, permitiendo con ello lograr una mejor comprensión del progreso que significa la reciente constitución de la Corte Penal Internacional, repasando luego los antecedentes de la misma a lo largo del siglo XX, para finalizar encuadrando y presentando las principales características del Estatuto de Roma de 1998En inglésThe author goes through certain aspects of the evolution and current state of International Law, which allows him to reach a better understanding of the progress implied by the constitution of the new International Criminal Court. He also reviews the antecedents of this court in the XX century and finally summarises and presents the main characteristics of the 1998 Rome Statute

UNRAVELING PARENTS' PERCEPTIONS OF ENGLISH LANGUAGE LEARNING

Purpose of the study: This research aims to analyze parents’ perceptions towards the learning of English and the ways they help their children deal with English and language assessment. Methodology: This qualitative study addresses 74 Chilean parents’ perceptions of English teaching and learning. A semi-structured interview was conducted to capture the participants’ perceptions. The data were categorized using content and frequency analysis and the principles of metaphoric analysis. Main findings: The findings suggest that parents hold a positive perception of the English language and believe it is useful for their children’s lives even though they might find the learning of the language difficult. Social implications/Originality: Participants can produce metaphors that regard English as an ability and metaphors that focus on the process of learning the language. The findings of this research are useful for university stakeholders, teachers, preservice teachers, and students. Novelty/Originality of this study: In this study parents, stakeholders who have usually left aside from the language teaching and learning process, are interviewed to unfold their perceptions of what they see and believe when their children learn English

QUIZIZZ Y SMARTPHONES: ESTRATEGIA DE CALENTAMIENTO PARA MEJORAR LA PARTICIPACIÓN EN CLASES DE LOS ESTUDIANTES UNIVERSITARIOS

Due to the impact of the internet and technology on the millennials generation, the teaching and learning process must be integrated by both trends, as they can increase university students’ motivation as well as their levels of class participation. This integration can be achieved through potential and authentic pedagogical strategies: warm-up activities using smartphones and a technological tool called Quizizz. The objectives of this study were: 1) to identify if students increased their class participation after using quizzes and smartphones as a warm-up strategy, and 2) to explore the perceptions of the students about their level of class participation. Data were collected with the application of three instruments (the teacher's diary, a classroom map, a students' perception scale) and also a combination of a qualitative and a quantitative data analysis. The results of this study pointed out that all of the 47 participants improved their willingness to participate in class. However, their own perceptions about participation did not show any particular change. In other words, the students´ willingness to participate in class positively changed, but their own perceptions about participation remained the same before and after the application of these strategies.Debido al impacto del internet y la tecnología en la generación de los millennials, el proceso de enseñanza-aprendizaje debe ser integrado por ambas tendencias, ya que pueden aumentar la  motivación de los estudiantes universitarios y sus niveles de participación en clases. Dicha integración puede lograrse a través de una potencial y auténtica estrategia pedagógica: las actividades de warm-up con smartphones y una herramienta tecnológica llamada Quizizz. Los objetivos de este estudio fueron: 1) identificar si los estudiantes aumentaron su participación en clases después del uso de quizizz y smartphones como estrategia de warm-up, y 2) explorar las percepciones de los estudiantes sobre su nivel de participación en clases.Los datos se recopilaron con tres instrumentos (El diario del profesor, el mapa del aula y la escala de percepción de los estudiantes) y se utilizó una combinación de análisis cualitativo y cuantitativo de datos. Los resultados de este estudio indicaron que los 47 participantes mejoraron su disposición de participar en clases. Sin embargo, sus propias percepciones al respecto, no revelaron ningún cambio. En otras palabras, la disposición de los estudiantes de participar en clases cambió positivamente, pero sus propias percepciones de participación, siguieron siendo las mismas antes y después de la estrategia

QUIZIZZ Y SMARTPHONES: ESTRATEGIA DE CALENTAMIENTO PARA MEJORAR LA PARTICIPACIÓN EN CLASES DE LOS ESTUDIANTES UNIVERSITARIOS

Due to the impact of the internet and technology on the millennials generation, the teaching and learning process must be integrated by both trends, as they can increase university students’ motivation as well as their levels of class participation. This integration can be achieved through potential and authentic pedagogical strategies: warm-up activities using smartphones and a technological tool called Quizizz. The objectives of this study were: 1) to identify if students increased their class participation after using quizzes and smartphones as a warm-up strategy, and 2) to explore the perceptions of the students about their level of class participation. Data were collected with the application of three instruments (the teacher's diary, a classroom map, a students' perception scale) and also a combination of a qualitative and a quantitative data analysis. The results of this study pointed out that all of the 47 participants improved their willingness to participate in class. However, their own perceptions about participation did not show any particular change. In other words, the students´ willingness to participate in class positively changed, but their own perceptions about participation remained the same before and after the application of these strategies.Debido al impacto del internet y la tecnología en la generación de los millennials, el proceso de enseñanza-aprendizaje debe ser integrado por ambas tendencias, ya que pueden aumentar la  motivación de los estudiantes universitarios y sus niveles de participación en clases. Dicha integración puede lograrse a través de una potencial y auténtica estrategia pedagógica: las actividades de warm-up con smartphones y una herramienta tecnológica llamada Quizizz. Los objetivos de este estudio fueron: 1) identificar si los estudiantes aumentaron su participación en clases después del uso de quizizz y smartphones como estrategia de warm-up, y 2) explorar las percepciones de los estudiantes sobre su nivel de participación en clases.Los datos se recopilaron con tres instrumentos (El diario del profesor, el mapa del aula y la escala de percepción de los estudiantes) y se utilizó una combinación de análisis cualitativo y cuantitativo de datos. Los resultados de este estudio indicaron que los 47 participantes mejoraron su disposición de participar en clases. Sin embargo, sus propias percepciones al respecto, no revelaron ningún cambio. En otras palabras, la disposición de los estudiantes de participar en clases cambió positivamente, pero sus propias percepciones de participación, siguieron siendo las mismas antes y después de la estrategia

Evaluation of Residual Stresses Induced by High Speed Milling Using an Indentation Method

In this work, a recently developed method based on the change of distance between collinear indents is used to evaluate different states of residual stress, which were generated in samples of AA 6082-T6 and AA 7075-T6 aluminium alloys milled at high speed. One of the advantages of this method, which needs a universal measuring machine, is not requiring neither the use of specific equipment nor highly skilled operators. Also, by integrating an indentation device to the mentioned machine, the absolute error of measurement can be reduced. In results obtained in samples subjected to different cutting conditions it is observed a correlation between the stress values and the depth of cut, showing the AA 6082-T6 alloy higher susceptibility to be stressed. Furthermore, the high sensitivity of the method allowed detecting very small differences in the values reached by different normal components in the zones corresponding to climb and conventional cutting. It is important to note that these differences were similar for both evaluated alloys. Finally, the directions associated with the principal components of residual stress, where maximum local plastic stretching occurs, were found to be strongly dependent on the rolling direction prior to machining.Fil: Diaz, Felipe Victor. Universidad Tecnológica Nacional. Facultad Regional Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Mammana, Claudio Alejandro. Universidad Tecnológica Nacional. Facultad Regional Rafaela; ArgentinaFil: Guidobono, Armando. Instituto Nacional de Tecnología Industrial; Argentin

Study of Residual Stresses from Two Machining Protocols Using an Indentation Method

Although high-speed machining offers a number of advantages over conventional machining, it is possible that the residual stress distributions generated by the former can affect the service life of the processed components. In this paper, a newly developed micro-indent method is used to evaluate different residual stress states, which were introduced in samples of AA 7075-T6 aluminum alloy milled at low and high-speed. Different surfaces were generated by varying the cutting speed in one order of magnitude, from 100 m/min to 1000 m/min. Two machining protocols, which consist of using different machine tools, were evaluated. The results show that it is possible to generate and to evaluate very small residual stresses. Finally, the values and levels obtained for normal components were analyzed in function of mechanical and thermal effects that generated the residual stresses.Fil: Diaz, Felipe Victor. Universidad Catolica de Santiago del Estero. Departamento Academico de Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe; ArgentinaFil: Mammana, Claudio A.. Universidad Catolica de Santiago del Estero. Departamento Academico de Rafaela; ArgentinaFil: Guidobono, Armando P.. Instituto Nacional de Tecnologia Industrial; Argentin

Periprosthetic Knee Infection: Ten Strategies That Work.

Periprosthetic joint infection (PJI) is one of the most serious complications following total knee arthroplasty (TKA). The demand for TKA is rapidly increasing, resulting in a subsequent increase in infections involving knee prosthesis. Despite the existence of common management practices, the best approach for several aspects in the management of periprosthetic knee infection remains controversial. This review examines the current understanding in the management of the following aspects of PJI: preoperative risk stratification, preoperative antibiotics, preoperative skin preparation, outpatient diagnosis, assessing for infection in revision cases, improving culture utility, irrigation and debridement, one and two-stage revision, and patient prognostic information. Moreover, ten strategies for the management of periprosthetic knee infection based on available literature, and experience of the authors were reviewed

Programa pais eficiencia enegetica, sector industrial de la septima region

El presente trabajo tiene como finalidad ser un aporte para el Programa País Eficiencia Energética. Esta enfocado en dar a conocer el nivel de eficiencia en el uso de los recursos energéticos de la Región del Maule. Esta organizado en 9 capítulos y contiene el resultado de la revisión de la literatura especializada[1], la propuesta metodológica para la elaboración de los indicadores de eficiencia energética, el resultado de los indicadores construidos, así como, una estimación preliminar del potencial del mejoramiento de la eficiencia energética en la Región. A principios del ano 2005 el Gobierno dio impulso al Programa País de Eficiencia Energética (PPEE), cuyo propósito central es el de construir un sistema de nacional de eficiencia energética. El Programa País de Eficiencia Energética consiste en la convocatoria de múltiples instituciones de gobierno, representantes de la sociedad civil y del sector productivo nacional con el objeto de coordinar esfuerzos para sacar adelante un conjunto de medidas especificas de mejoramiento de la eficiencia energética con impacto en el corto y mediano plazo, así como preparar las bases para establecer una acción permanente en la sociedad para hacer un uso eficiente de los recursos energéticos. Las primeras dos secciones son introductorias al tema de este estudio, en el segundo titulo se abordan temas teóricos relativos a elementos básicos y definiciones[2]. En la parte 4 se presenta la metodología de trabajo y en la 5 se dan a conocer los análisis y resultados. El capitulo 6 presenta un reporte de una de las empresas que participaron con mayor interés. Este fue elaborado después de varias visitas y reuniones que tuvimos con ellos, dándonos cuenta que esta viva tiene un gran potencial de ahorro. El capitulo 7 contempla un pequeño manual que da algunos consejos de buenas practicas para el uso eficiente de los equipos consumidores de energía. El capitulo 8 presenta las conclusiones finales del documento y el capitulo 9 muestra la bibliografía utilizada. Finalmente, es importante dejar en claro que este estudio no tiene la labor de buscar las causas del comportamiento en el uso de los recursos energéticos, si no mas bien, exponer los potenciales ahorros de energía si estos recursos se utilizaran de manera adecuada. Por ende, el propósito de este estudio, es dar a conocer específicamente al Gobierno la manera en que se utilizan los recursos energéticos en la Región del Maule

Determination and Analysis of Residual Stresses Induced by High Speed Milling Using a Micro-indent Method

The purpose of this work is to determine and analyze residual stress normal components and anisotropy degrees introduced by high-speed milling in specimens of AA 6082-T6 and AA 7075-T6 aluminum alloys. At each machined sample, the climb and conventional cutting zones were evaluated and compared. This paper includes a comprehensive study of thermal and mechanical effects associated with the residual stress introduction. For normal components determination, an optimized micro-indent method was used. Each measurement sequence from this approach was performed using a high accuracy measuring machine and classified according to thermal deviations measured. The residual displacements were determined with an absolute error down to ±300 nm. The normal components analysis allowed to infer the strong influence of the rolling process previous to high-speed milling and besides, the stress levels associated with thermal effects (higher in AA 7075-T6). Finally, the lower residual stress anisotropy degrees in both materials observed in the conventional cutting zone would indicate more homogenous local plastic stretching in this region for all planar directions.Fil: Vottero, S.. Universidad Tecnológica Nacional. Facultad Regional Rafaela; ArgentinaFil: Diaz, Felipe Victor. Universidad Tecnológica Nacional. Facultad Regional Rafaela; ArgentinaFil: Mammana, Claudio Alejandro. Universidad Tecnológica Nacional. Facultad Regional Rafaela; ArgentinaFil: Guidobono, A.. Instituto Nacional de Tecnología Industrial; Argentin