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Mostrando ítems 11-20 de 21

#### Renal lithiasis detection in uro-computed tomography using a non-parametric technique

(IOP Publishing, 2019)

Renal lithiasis is the pathology that causes nephritic colic, which is one of the most frequent reasons for consultation in emergency medical services. According to the size, location, hardness and number of stones present in the urinary system, usually in the human kidney, it is established to which form of treatment is suitable for the patient. These kidney stones can be analyzed by means of biopsy or imaging modalities such as computed tomography images. This type of images has challenging problems called noise, artifacts and low contrast. In ...

#### Testing GeoGebra as an effective tool to improve the understanding of the concept of limit on engineering students

(IOP Publishing, 2019)

The impact GeoGebra on the teaching of the concept of limit was analyzed. Two
groups of engineering students, studying differential calculus, served as control and test groups.
The traditional teaching, based on examples solved by hand, was given to the control group
while a series of activities involving the usage of the mathematical software GeoGebra were
applied in an attempt of improving the degree of assimilation on the concept of limits.

#### Volumetric quantification in ovarian pathology using abdomino-pelvic computed tomography

(IOP Publishing, 2019)

Pathological ovary is categorized into cystic tumors, solid tumors and mixed,
according to the content of the affected ovary. Accordingly, the degree of benignity or
malignity thereof is established. The imaging study for the preliminary morphological
assessment of PO is ultrasound, in its pelvic and transvaginal modalities, for which wellestablished
criteria are available. Once the ultrasound findings suggest malignancy,
complementary studies such as abdominal-pelvic tomography images and tumor markers are
requested. This type of images ...

#### Semi-automatic detection of hepatic tumor in computed tomography images

(IOP Publishing, 2019)

In this work, the main purpose is develop a computational segmentation strategy for
liver tumor semiautomatic detection. This strategy considers three-dimensional computed
tomography images and it consists of techniques application that, on the one hand, diminish the
noise and detect the edges of the objects present in those images and, on the other hand, generate
the liver tumor morphology. For this, the sequence of techniques composed of gaussian
smoothing, gradient magnitude, median filter, region growing and binary morphological dilation
are ...

#### Problem solving strategy in the teaching and learning processes of quantitative reasoning

(IOP Publishing, 2019)

The study presents an analysis of Polya's problem-solving strategy used in the training
processes of quantitative reasoning competence in students of the Universidad Simón Bolívar,
San José de Cúcuta, Colombia. The research was based on a descriptive design and had an
intentional sample of 58 students who were studying the sciences and general competencies
elective. For the collection of information, a diagnostic test (pre-test) and a final test (post-test)
were applied, in order to check the incidence of the applied strategy. The results ...

#### Left atrial appendage automatic segmentation, in computed tomography images

(IOP Publishing, 2019)

The left atrial appendage is one of the anatomical places where most frequently
blood thrombi occur. When migrating from the appendage, these thrombi, become blood
emboli that, potentially, can compromise the physiology and/or anatomy of cardiac or cerebral
blood vessels, being able to generate cerebrovascular events. The left atrial appendage
segmentation is very difficult due, mainly, to its location and the identical densitometric
information presents into of this appendage and around of the left atrium. In this paper, an
automatic ...

#### Learning the concept of integral through the appropriation of the competence in Riemann sums

(IOP Publishing, 2020)

It is proposed that the difficulty of engineering students into understanding the concept of the integral, as a way for calculating the area under a curve, can be overcame if students are taught how to translate it into the problem of calculating a Riemann sum. A series of applied problems are proposed to provide a frame that required to calculate the area under a curve to two groups of students. For one of these groups, Geogebra was proposed as a tool that could be used to maintain the focus of students into the concepts, by providing ways to ...

#### Development of random thinking: Reflections and considerations

(IOP Publishing, 2020)

This article discloses some considerations and reflections in the teaching of random thinking and data systems based on a documentary review. A documentary sample was used consisting of 40 documentary sources (articles, postgraduate dissertations and books), published in indexed journals, about random thinking. The research was based on a qualitative content analysis method which used the coding and categories saturation process. The results let us establish conceptual relationships considering three dimensions linked to the random thinking ...

#### The rubric as an assessment strategy in the mathematical argumentation process

(IOP Publishing, 2020)

The article shares the proposal of an analytical rubric as a strategy for the assessment and monitoring of learning outcomes in students who develop an argumentative plot from the mathematics field, to solve any problem situation in daily life. The study was based on the theory of mathematical argumentation proposed by Duval and the contributions of León and Calderón, as well as the dimensions presented to us by the logical frameworks in the design of analytical rubrics. The research was developed under the social critical paradigm through the ...

#### Developmental perspectives of numerical thinking for the interpretation of physical quantities

(IOP Publishing, 2020)

This research reveals the perspectives in the teaching of numerical thinking through a documentary review. The representation of physical elements such as functions, vectors and operators, and their subsequent interpretation through numerical thinking gives meaning to the physical quantities that such elements represent. A documentary sample integrated for 40 sources on numerical thinking such as articles published in indexed journals, postgraduate dissertations, and books is considered. A qualitative content analysis method is used. First, an ...