El mancebo sin culpa : romanzo dramático y de amor

Copia digital. Madrid : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, 201

Data hiding using integer lifting wavelet transform and DNA computing

DNA computing widely used in encryption or hiding the data. Many researchers have proposed many developments of encryption and hiding algorithms based on DNA sequence to provide new algorithms. In this paper data hiding using integer lifting wavelet transform based on DNA computing is presented. The transform is applied on blue channel of the cover image. The DNA encoding used to encode the two most significant bits of LL sub-band. The produced DNA sequence used for two purpose, firstly, it use to construct the key for encryption the secret data and secondly to select the pixels in HL, LH, HH sub-bands for hiding in them. Many measurement parameters used to evaluate the performance of the proposed method such PSNR, MSE, and SSIM. The experimental results show high performance with respect to different embedding rate

MÍDIA, CULTURA E IDENTIDADE: FRAGMENTOS DE UM OLHAR

O presente artigo aborda os conceitos de cultura, mídia e identidade, buscando relacioná-los com a pesquisa sobre a comunidade tradicional quilombola, especificamente à Comunidade do Taquaral na cidade de Três Corações/MG.Palavras-Chave: mídia; cultura; identidade; quilombola

Engine Downsizing; Global Approach to Reduce Emissions: A World-Wide Review:A World-Wide Review

Engine downsizing is a promising method to reduce emissions and fuel consumption of internal combustion engines. The main concept is to reduce engine displacement volume while keeping the needed output characteristics unchanged. The issue has become one of the most current fields of interest in recent years after the International Energy Agency set a target of a 50% reduction in global average emissions by the year 2030. In this review paper, different aspects of researchers’ efforts on engine downsizing are configured and, due to overlaps, categorized into five main areas. Each category is discussed thoroughly, and recent works are highlighted. The global attention in these categories, the countries involved and the trend change in the last four years are presented in detail. Doi: 10.28991/HIJ-2021-02-04-010 Full Text: PD

CULTURA E IDENTIDADE, PRESSUPOSTOS PARA A CONSTITUIÇÃO DO SUJEITO PÓS-MODERNO: ENFOQUE SOBRE OS AFRODESCENDENTES

Esse estudo busca lançar luz sobre a questão da identidade do homem pós-moderno, uma vez que para alguns estudiosos a identidade encontra-se em constante mudança, fazendo emergir o homem moderno fragmentado. E o sujeito pós-moderno seria aquele composto por várias identidades. Este sujeito se caracteriza como não tendo uma identidade fixa, essencial ou permanente.Palavras-chave: Cultura. Identidade. Pós-Moderno. Sujeito. Afrodescendente

Steganography using dual tree complex wavelet transform with LSB indicator technique

Image steganography is undoubtedly significant in the field of secure multimedia communication. The undetectability and high payload capacity are two of the important characteristics of any form of steganography. In this paper, the level of image security is improved by combining the steganography and cryptography techniques in order to produce the secured image. The proposed method depends on using LSBs as an indicator for hiding encrypted bits in dual tree complex wavelet coefficient DT-CWT. The cover image is divided into non overlapping blocks of size (3*3). After that, a Key is produced by extracting the center pixel (pc) from each block to encrypt each character in the secret text. The cover image is converted using DT-CWT, then the produced key is used to determine the starting pixel in each block for hiding and the direction of hiding (clockwise or anticlockwise). The proposed method is applied on many images with different embedding rate, and many metrics are used to evaluate the performance of the proposed method such as Peak Signal to Noise Ratio (PSNR), Mean Square Error (MSE), correlation factor (CF) and Structural Similarity Index Measure (SSIM). It achieves in average 52.225 dB of PSNR, 0.3215 of MSE, 0.9952 of SSIM and 0.9997 of CF with embedding rate 1.5