National Institute of Technology, Meghalaya

About: National Institute of Technology, Meghalaya is a education organization based out in Shillong, India. It is known for research contribution in the topics: Control theory & Computer science. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

Supervised Feature Extraction of Hyperspectral Images Using Partitioned Maximum Margin Criterion

Abstract: Dimensionality reduction is an important task where the aim is to reduce the number of features and make the system less time consuming for classification. Here, the drawbacks of Fisher’s linear-discriminant-analysis-based feature extraction (FE) methods are addressed and a proposal is made to overcome it as well as to reduce the Hughes phenomenon and computational complexity of the system. The proposed FE technique initially partitions the complete set of features into several highly correlated subgroups. Then a linear transformation is performed using a maximal margin criterion over each subgroup. The proposed method is supervised in nature, because prior information about the class label of data is required to calculate the maximum margin criterion based on interclass and intraclass scatter matrices. Experiments are conducted with the PaviaU and Indian pine data sets, and the results are compared with five state-of-the-art techniques, both qualitatively and quantitatively, to demonstrate the effectiveness of the proposed method.

Hall current and thermo-diffusion effects on magnetohydrodynamic convective flow near an oscillatory plate with ramped type thermal and solutal boundary conditions

Abstract: The present discussion deals with the study of time-dependent hydromagnetic free convection fluid flow with heat and mass transfer over an oscillating vertical plate which is placed in a porous medium with ramped wall temperature and wall concentration in the presence of Hall current, rotation, chemical reaction, thermal radiation, thermo-diffusion (Soret effect). The governing system of equations is non-dimensionalized by using suitable dimensionless variables and parameters. The non-dimensional equations are solved analytically using the Laplace transform technique. The influence of various pertinent flow parameters on velocity, temperature and concentration fields are analyzed and portrayed through figures, whereas the skin friction, Nusselt number and Sherwood number are described and shown in tabular form.