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Using an Interactive Computer System to Support the Task of Building the Notions of Ratio and Proportion  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2010, DOI: 10.4236/ce.2010.12017
Abstract: This article describes the design and general outcome of applying a computer system that includes interactive activities to the topics of ratio and proportion. The work was undertaken with Mexican students attending primary school grade six (11 year olds). In designing the activities, our work was based on the studies of researchers who have focused on such topics, as well as on the work of researchers in the field of computer sciences and education technology. Support of the activities designed is found in psycho-pedagogy, in knowledge of mathematics and in the fields of computer sciences and education technology.
Representation Registers in the Solution of Calculus Problems  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23036
Abstract: This article is derived from the research project registered under number 20110343 (Ruiz, 2011), and developed in Escuela Superior de Cómputo del Instituto Politécnico Nacional (IPN) (School of Computer Sciences of the National Poly-technical Institute of Mexico). The article reports on the problems found among Engineering students with respect to their resistance to using different representation registers when solving optimization problems in the Calculus Learning Unit. Use of such registers could help the students to build mathematics know ledge and to solve calculus problems. As a didactic strategy, simulations are used in an electronic environment in order to support the students by fostering their use of tabular, graphical and algebraic representation registers. Interviews are undertaken of six of the professors who give the calculus courses, and a diagnostic questionnaire is applied to 68 students prior to and after working with the proposal. As for the theoretical framework, the work reported by Duval and Hitt is salient in this report, particularly their emphasis of the fact that working on activities by way of one single representation system is not sufficient. From the first responses provided by the students, one can conclude that the algebraic register is preferred by the majority of students. It is however used in a mechanical fashion without affording any meaning to the content of the problem and to the process of solving it. Another conclusion reported is that implementing tasks in the classroom in which the mathematics activity requires coherent use of different representations is necessary.
Primary and Secondary Teachers’ Knowledge, Interpretation, and Approaches to Students Errors about Ratio and Proportion Topics  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23035
Abstract: This study investigated elementary and secondary teachers’ understanding and pedagogical strategies applied to students making errors in finding a missing length in similar rectangles. It was revealed that secondary teachers had better understanding of ratio and proportion in similar rectangles than elementary teachers. While all secondary teachers solved the similar rectangles problems correctly, a large portion of elementary teacher struggled with the problem. In explaining their solution strategies, and even though similar strategies appeared both from elementary teachers and secondary teachers, a majority of secondary teachers pointed out the underlying idea of similarity, whereas less than half of the elementary teachers explained their reasoning for using ratios and proportion. This article is derived from the research project registered under number 20110343 (Ruiz, 2011), and developed in Escuela Superior de Cómputo del Instituto Politécnico Nacional (IPN) (School of Computer Sciences of the National Poly-technical Institute of Mexico)
A Cognitive Analysis When the Students Solve Problems  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.34063
Abstract: The research reported in this paper shows an analysis of the cognitive process of students from the senior technical program on food technology, whom are asked to solve a contextualized event on systems of linear algebraic equations within the context of balance of matter in situations of chemical mixtures. The cognitive analysis is founded on the theories of Conceptual Fields and vents. For the analysis attention is focused on the representations carried out by students regarding the invariants in the schemes that they build when they face an event of contextualized mathematics. During the acting process of students emerge different types of representation which are appropriate to the context in which the research develops, with which a proposal for the classification of them.
Osvaldo Barsky y Mabel Dávila. 2008. La rebelión del campo. Historia del conflicto agrario argentino. Buenos Aires: Sudamericana. 352 p.
Leonardo Ledesma
Mundo agrario , 2009,
Abstract:
Revista de Ocio y Turismo. ROTUR: La innovación en el sector turismo
Alicia Ledesma
Estudios y perspectivas en turismo , 2009,
Abstract:
Las prácticas médicas y la biología como ciencia: paradigmas, asimilación y domesticación social en México
Ledesma-Mateos, Ismael;
História, Ciências, Saúde-Manguinhos , 2008, DOI: 10.1590/S0104-59702008000200014
Abstract: the functional paradigms of biology emerged in europe on the margins of medicine, but medical communities appropriated them into society, thereby generating some friction between them. originally, cell theory and theories about physiological processes did not concern physicians, but they became assimilated into the new medicine and studies into heredity and microbiology, which since their emergence had been close to medical practice, and were quickly appropriated by this new form of medicine. the 'social domestication' of this knowledge involved a process of translation to the new environment, giving rise to hybrid versions with quite distinct features from their european counterparts. here, we analyze and discuss the introduction of biology paradigms into mexico (19th and 20th centuries).
Alcances y limitaciones para caracterizar las ocupaciones formativas en Cafayate (Salta)
Ledesma,Rossana; Subelza,Claudia;
Andes , 2009,
Abstract: this work analyses the possibilities and limitatios of placing the archaeological formative sites the cafayate (salta) micro-region from the chronological point of view. records show peculiarities that do not correspond well with the antecedents of this subregion. absolute radiocarbon-dated indicators as well as the relative ones, such as rock art, pottery technology and different kinds of placement in the south of calchaquí valley were used to estimate the pre-santamariana occupations chronologically. on a micro-regional scale there was a progress in the chronological, technological, ritual and territorial knowledge. this information shows that the social processes were peculiar and that populations were part of a dynamics different from the regional one
Contexto de producción de pinturas rupestres en el divisadero (departamento de Cafayate, provincia de Salta, Argentina)
Ledesma,Rossana E.;
Andes , 2005,
Abstract: one of the difficulties of using rock art as archeological vestige is the association between occupations and pictorial records on walls. this paper intends to tackle two aspects of el divisadero: both to define context-times and to identify the elements that permit their correlation with the paintings. wall paintings production context is used as an analysis unit, while art design patterns and production vestiges are used as archeological indicators. for the first aspect, analysis were carried out to determine canons, patterns, and subjects at intra-site level. observations allow to propose four canons, eight patterns and three subjects. for the second aspect, excavations were conducted at the cueva de los camélidos and x-ray diffraction analysis of mineral vestiges was performed. three contexts-time not linked with everyday activities were defined. regarding the pictorial production context, the following aspects were estimated: the usage of local materials as gypsum and quartz, the use of hemihydrated gypsum in the coloring mixture, the motives placed in a place selected with limited visibility and access, and the surface treatment. elements to consider that the first occupation of the cueva de los camélidos correspond with the time of the wall paintings arise from the data obtained on the occupations and the production sequence. due to the highly deteriorated state of the site (looted and repainted with lime) elements to define maintenance and reclycling are absent.
Enunciacion de la letra: Un ejercicio entre Occidente y Oriente
Ledesma,María;
Cuadernos del Centro de Estudios en Dise?±o y Comunicaci?3n. Ensayos , 2012,
Abstract: the article is directed towards questioning the semiotic studies that often separate the verbal from the visual, proposing instead a kind of semiosis that considers the resultant significance as a product of a complex semiotic in wich multiple communicational channels are opened. this is demonstrated by taking the writing as a paradigmatic case that, in ennunciation instances, comes to show the weakness of the idea of dividing the "verbal text" feld and the visual feld.
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