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Design of a Fractional Order Low-pass Filter Using a Diﬀerential Voltage Current Conveyor

Krishna Battula Tirumala, Janarthanan Midhunchakkaravathy

Journal of Telecommunications and Information Technology

2023

nr 2

17--21

In this paper, an active implementation of a diﬀerential voltage current conveyor (DVCC) based on a low-pass ﬁlter operating in the fractional order domain is presented. The transfer function for a fractional order system is dependent on the rational approximation of sα. Diﬀerent methods used for calculating the rational approximation, including Carlson, Elkhazalil, and curve ﬁtting, are evaluated here. Finally, to validate the theoretical results, a fractional order Butterworth ﬁlter is simulated in the Pspice environment using the 0.5 micrometer CMOS technology with an R-C network-based fractional order capacitor. Additionally, using the Monte Carlo analysis, the impact of current and voltage faults on DVCC response is investigated. It has been inferred that realization with a wider bandwidth is possible.

Tropical cyclone detection in South Pacifc and Atlantic coastal area using optical fow estimation and RESNET deep learning model

Malothu Nagu, Prasad Varre Venkata Kanaka Durga Vara, Krishna Battula Tirumala

Acta Geophysica

2022

Vol. 70, no 6

2855--2871

Tropical cyclones (TC) are among the worst natural disasters, that cause massive damage to property and lives. The meteorologists track these natural phenomena using Satellite imagery. The spiral rain bands appear in a cyclic pattern with an eye as a center in the satellite image. Automatic identification of the cyclic pattern is a challenging task due to the clouds present around the structure. Conventional approaches use only image data to detect the cyclic structure using deep learning algorithms. The training and testing data consist of positive and negative samples of TC. But the cyclic structure’s texture pattern makes it difficult for the deep learning algorithms to extract useful features. This paper presents an automatic TC detection algorithm using optical flow estimation and deep learning algorithms to overcome this draw-back. The optical flow vectors are estimated using the Horn-Schunck estimator, the Liu-Shen estimator, and the Lagrange multiplier. The deep learning algorithms take the optical flow vectors as input during the training stage and extract the features to identify the cyclone’s circular pattern. The software used for experimental analysis is MATLAB 2021a. The proposed method increases the accuracy of detecting the cyclone pattern through optical flow vectors compared to using the pixel intensity values. By using proposed method 98% of accuracy will be achieved when compared with the existing methods.