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Total Data Quality Management (TDQM) methodology claims that we should manage data as we manage products, but principles, guidelines, and techniques of Total Quality Management for physical products have limitations in TDQM practices because of the nature of data. Some concepts and models are proposed for resolving problems in TDQM practices. Firstly, history evolvement of product is discussed, and...
An algorithm, which is based on the DCT domain, embedding a watermarking color image into a host color image is proposed to protect the copyrights of color images. The coordinates of R,G and B components are scrambled by logistic mapping before those components are embedded. Then the scrambled R,G and B components in color spaces are used as watermarking sequences. The host image blocks are classified...
Multiple-point geostatistics (MPS) simulation originates from geostatistical fields and allows extracting multiple-point structures from training images, after that MPS can copy these structures to the regions to be simulated. Porosity is quite significant to the characterization and prediction of transport properties. To simulate the porosity value, a porosity simulation method using continuous MPS...
A reversible and fragile watermarking algorithm based on DCT is proposed for the authentication of digital products. According to the characteristics of high-frequency coefficients of DCT, when the watermarking bit 1 is embedded in an image block, fixed values of some high-frequency coefficients of DCT in the block are modified. However, no modifications will be made when the watermarking bit 0 is...
Well log analysis is one of the costliest parts of petroleum fields. It has been realized that developing Synthetic well logs can help analyze the reservoir properties in areas where some necessary logs are absent or incomplete, and then reduce costs of companies. During generating synthetic logs, logging time should be used sufficiently for predicting trends and filling some incomplete logs to obtain...
A novel algorithm for querying similar time series was proposed to satisfy the requirement of fitting and indexing time series. The approach first fits time series using two parameters of midline distance and turning points, which is benefit for fast retrieval of similar sequences. After finding similar segmented subsequence by segmented dynamic time warping distance, this method then search this...
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