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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

CÃdigos de barra e criptografia / Bar codes and cryptography

AurÃlio EugÃnio Aguiar de Lima 26 April 2014 (has links)
CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior / Descreveremos o surgimento e o desenvolvimento dos cÃdigos de barra. Explicaremos como funcionam os cÃdigos UPC, EAN, ISBN e o QR Code. Enfatizaremos o EAN â 13 â o mais usado atualmente -, mostrando em que casos e como esse cÃdigo consegue detectar erros cometidos por falha humana. AlÃm disso, faremos um estudo da criptografia, citando o cÃdigo de CÃsar e o cÃdigo de blocos. Faremos tambÃm um estudo mais detalhado da criptografia RSA, exemplificando a codificaÃÃo e a decodificaÃÃo. / We will describe the emergence and development of the barcodes. Weâll explain how the UPC, EAN, ISBN and QR codes work. We will emphasize the EAN-13 â the most currently used-showing where and how this code can detect errors committed by human error. In addition, we make a study of cryptography, quoting the code of Caesar and the code block. We will also do a more detailed study of RSA encryption, exemplifying encoding and decoding.
2

A qualitative study: how Solution Snippets are presented in Stack Overflow and how those Solution Snippets need to be adapted for reuse

Weeraddana, Nimmi Rashinika 22 March 2022 (has links)
Researchers use datasets of Question-Solution pairs to train machine learning models, such as source code generation models. A Question-Solution pair contains two parts: a programming question and its corresponding Solution Snippet. A Solution Snippet is a source code that solves a programming question. These datasets of Question-Solution pairs can be extracted from a number of different platforms. In this research, I study how Question-Solution pairs are extracted from Stack Overflow (SO). There are two limitations of datasets of Question-Solution pairs extracted from SO: (1) according to the authors of these datasets, some Question-Solution pairs contain Solution Snippets that do not solve the question correctly, and (2) these datasets do not contain the information on how Solution Snippets need to be reused, and such information would enhance the reusability of Solution Snippets. These limitations of datasets of pairs could adversely affect the quality of the code being generated by machine learning models. In this research, I conducted a qualitative study to categorize various presentations of Solution Snippets in SO’s answers as well as how Solution Snippets can be adapted for reuse. By doing so, I identified eight categories of how Solution Snippets are presented in SO’s answers and five categories of how Solution Snippets could be adapted. Based on these results, I concluded several potential reasons why it is not easy to create datasets of Question-Solution pairs. The first categorization informs that finding the correct location of the Solution Snippet is challenging when there are several code blocks within the answer to the question. Subsequently, the researcher must identify which code within that code block is the Solution Snippet. The second categorization informs that most Solution Snippets appear challenging to be adapted for reuse, and how Solution Snippets are potentially adapted is not explicitly stated in them. These insights shed light on creating better quality datasets from questions and answers posted on Stack Overflow. / Graduate

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