Search results for "Python"
showing 10 items of 160 documents
Automated segmentation and description of the internal morphology of human permanent teeth by means of micro-CT
2020
High-resolution micro-computed tomography is a powerful tool to analyze and visualize the internal morphology of human permanent teeth. It is increasingly used for investigation of epidemiological questions to provide the dentist with the necessary information required for successful endodontic treatment. The aim of the present paper was to propose an image processing method to automate parts of the work needed to fully describe the internal morphology of human permanent teeth. One hundred and four human teeth were scanned on a high-resolution micro-CT scanner using an automatic specimen changer. Python code in a Jupyter notebook was used to verify and process the scans, prepare the dataset…
A pragmatic study of nonsense, from Lewis Carroll to the Monty Python
2010
This dissertation consists in a study of verbal exchanges in nonsense literature, from the last quarter of the nineteenth century and one of the two fathers of the genre, Lewis Carroll, to the last quarter of the twentieth century and his glorious heirs, the Monty Python. The corpus is taken from the whole of English-speaking nonsense literature, be it English (Lewis Carroll, the Monty Python, N.F. Simpson), Canadian (Stephen Leacock), or American (Robert Benchley, Donald Ogden Stewart, Joseph Heller and the Marx Brothers). As the title indicates, the study of verbal exchanges will rely on pragmatic analysis, pragmatics being the study of how language works as a practice, in social context.…
Imaginary time propagation code for large-scale two-dimensional eigenvalue problems in magnetic fields
2013
We present a code for solving the single-particle, time-independent Schr\"odinger equation in two dimensions. Our program utilizes the imaginary time propagation (ITP) algorithm, and it includes the most recent developments in the ITP method: the arbitrary order operator factorization and the exact inclusion of a (possibly very strong) magnetic field. Our program is able to solve thousands of eigenstates of a two-dimensional quantum system in reasonable time with commonly available hardware. The main motivation behind our work is to allow the study of highly excited states and energy spectra of two-dimensional quantum dots and billiard systems with a single versatile code, e.g., in quantum …
Efficiency and Stability of a Family of Iterative Schemes for Solving Nonlinear Equations
2019
In this paper, we construct a family of iterative methods with memory from one without memory, analyzing their convergence and stability. The main aim of this manuscript yields in the advantage that the use of real multidimensional dynamics gives us to decide among the different classes designed and, afterwards, to select its most stable members. Some numerical tests confirm the theoretical results.
Skaitļu atpazīšana brīvā dabā uzņemtās fotogrāfijās
2022
Palielinoties digitālo tehnoloģiju lomai cilvēku ikdienā, OCR jeb Optiskā teksta pazīšana kļūst arvien biežāk izmantota. OCR pielietojumu iespējas ir plašas – kā vienu no biežāk izmantotajām var minēt dokumentu digitalizēšanu – tomēr brīvā dabā uzņemtās fotogrāfijās ar skaitļiem OCR precizitātei vēl joprojām ir vieta izaugsmei. Darba mērķis ir noteikt, cik liela loma un ietekme ir OCR tehnoloģijām mūsdienās un kāpēc tās efektivitāte krīt, analizējot attēlus ar skaitļiem. Darba uzdevumi ietver iepazīšanos ar OCR tehnoloģijas vēsturi un pielietojumiem mūsdienās, tehnoloģijas algoritmiem un trūkumiem tajos. Darba pētījumā tika izpētīti divi OCR rīki, izmantojot programmēšanas valodu Python, un…
Selftype is a special case
1991
It is pointed out that selftype is actually only a special case of a construct that has been well described in the literature.
An academic performance indicator using flexible multi-criteria methods
2021
Composite indicators are a very useful tool for conveying summary information on the overall performance of institutions and facilitating decision-making. Increasingly, there is a demand for indicators that allow performance to be assessed after the implementation of a strategy. This has several difficulties, and in this paper, we address three of them: how to evaluate at different points in time, how to estimate the weighting of the criteria and how to normalize the data. Our proposal is based on multicriteria techniques, using a recent method, uwTOPSIS, and is applied to data collected from 2975 students enrolled in the first year of science and engineering at the Industrial University of…
Traffic simulation models calibration using speed–density relationship: An automated procedure based on genetic algorithm
2016
Calibration of traffic models.Calibration as optimization problem.Use of genetic algorithm. This paper presents the first results of a research which applied a genetic algorithm to calibrate a microscopic traffic simulation model based on speed-density relationships. A large set of traffic data collected from the A22 Freeway, Italy, was used and a comparison was performed between the field measurements and the simulation outputs obtained for a test freeway segment by using the Aimsun microscopic simulator.The calibration was formulated as an optimization problem to be solved based on a genetic algorithm; the objective function was defined in order to minimize the differences between the sim…
Hybrid electric vehicle powertrain design: Construction of topologies and initial design schemes
2018
This paper introduces the generic representation and construction methods for the architectures of the four-wheel-drive hybrid electric vehicle (HEV) powertrain, which achieve the unified rules to represent and construct all types of HEV powertrains. To map the architecture into numerical variables and add it into optimization, the kinematic matrix of the HEV powertrain is extracted corresponding to the topological structure. Based on the torque distribution requirement of four-wheel-drive HEV, the initial design schemes (architecture and parameters) are created by charge-under-go feasibility inspection.
PenRed: An extensible and parallel Monte-Carlo framework for radiation transport based on PENELOPE
2021
Monte Carlo methods provide detailed and accurate results for radiation transport simulations. Unfortunately, the high computational cost of these methods limits its usage in real-time applications. Moreover, existing computer codes do not provide a methodology for adapting these kind of simulations to specific problems without advanced knowledge of the corresponding code system, and this restricts their applicability. To help solve these current limitations, we present PenRed, a general-purpose, stand-alone, extensible and modular framework code based on PENELOPE for parallel Monte Carlo simulations of electron-photon transport through matter. It has been implemented in C++ programming lan…