We introduce the notion of Principal Component Analysis (PCA) of image gradient orientations. As image data is typically noisy, but noise is substantially different from Gaussian, traditional PCA of pixel intensities very often fails to estimate reliably the low-dimensional subspace of a given data population. We show that replacing intensities with gradient orientations and the l2 norm with a ...

A method is proposed for performing clustering and offline indexing on the signal representations of compressed JPEG images. The current system clusters on Discrete Cosine Transform (DCT) blocks of JPEG images using the Potential Function clustering algorithm, storing indices of varying length for a posteriori comparison and processing of query images. Results presented indicate the appropriate...

Feature selection (FS) is a global optimization problem in machine learning, which reduces the number of features, removes irrelevant, noisy and redundant data, and results in acceptable recognition accuracy. This paper presents a novel feature selection algorithm based on Bacteria Foraging Optimization (BFO). The algorithm is applied to coefficients extracted by discrete cosine transforms (DCT...

This paper presents an improvement of digital differential relay reliability for protecting a large power transfer is discussed. First, the Fourier sine and cosine coefficients required for fundamental, second third and fifth harmonies determination have been calculated using rectangular transfer technique. Then, these harmonics have been used in harmonics restrain and blocking techniques used ...

In this article, we build models to predict the existence of citations among papers by formulating link prediction for 5 large-scale datasets of citation networks. The supervised machine-learning model is applied with 11 features. As a result, our learner performs very well, with the F1 values of between 0.74 and 0.82. Three features in particular, link-based Jaccard coefficient , difference in...

This paper is an empirical attempt to investigate bilateral trade flow between Iran and Russia. To this end, we used statistical analyses on macroeconomic series over the period of 1991-2017. Results revealed that there is a significant statistical difference in terms of exports between Iran and Russia, and that there has always been a buyer-seller dialogue between the two countries. According ...

Increasingly, taxonomies are being developed for a wide variety of industrial domains and specific applications within those domains. These industry or application specific taxonomies attempt to represent the vocabularies commonly used by the practitioners. These formal representations have the potential to automate information retrieval, facilitate interoperability and improve decision making....

A two-sided sequence (cn)n∈Z with values in a complex unital Banach algebra is a cosine sequence if it satisfies cn+m + cn−m = 2cncm for any n,m ∈ Z with c0 equal to the unity of the algebra. A cosine sequence (cn)n∈Z is bounded if supn∈Z ‖cn‖ < ∞. A (bounded) group decomposition for a cosine sequence c = (cn)n∈Z is a representation of c as cn = (b n +b−n)/2 for every n ∈ Z, where b is an inver...

In this paper, we describe the overview of our work in Short Text Conversation 2 task at NTCIR-13. We propose two different methods including retrieval-based method and generation-based method. Our retrieval-based method contains index part and reranking part. Rep-post is used as query to search comments from rep-cmnt, and indexed candidate comments are re-ranked by three models respectively. O...

harmonics terms in the frequency range associated with breathing. The volunteers are sorted according to their body mass index (BMI). Cosine (C) and sine (S) terms can be expressed by X and Y according to C=X-Y, S=XY. Fig. 3: Standard deviation of the field changes due to breathing at the position of the imaged slices for 9 volunteers. The dashed line indicates intrinsic field stability. Utilit...