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The temperature and dew point records of seven weather stations, located in India have been scrutinized under the self-organized criticality regime. The data models an almost ideal scaling behaviour as of the type of t/fα noise; with α≈1. This scaling behaviour strongly suggests the presence of self-organized criticality (SOC) behind both the signals. To draw more insight into the detailed dynamics...
Accuracy of the well-known k-nearest neighbor (kNN) classifier heavily depends on the choice of k. The problem of estimating a suitable k for any test point becomes difficult due to several factors like the local distribution of training points around that test point, presence of outliers in the dataset, and, dimensionality of the feature space. In this paper, we propose a dynamic k estimation algorithm...
Accuracy of the well-known kNN classifier depends significantly on the suitable choice of k. In this paper, we propose an improved kNN algorithm with a novel non-parametric test point specific k estimation strategy. To estimate k for any test point, we first construct a hyper sphere around it to capture the local distribution of the surrounding training points. Class hubness information is then used...
In the present work, we have considered the daily signal of Solar Radio flux of 2800 Hz recorded daily by radio telescopes near Ottawa (operated during 14th February, 1947–31st May, 1991) and Penticton, British Columbia, Dominion Radio Astrophysical Observatory (operating since 1st June, 1991) during the period from 29th October, 1972 to 28th February, 2013. We have applied FIR nonlinear phase filter...
Not a single Indian university is among the World's top 200, according to a new global ranking. The QS World Universities Ranking published has miserable news for India's education system. Around 11 Indian institutes/universities feature in the top 800 of the global lists with the highest ranking going to IIT Delhi which is passed 222 in the list. Two other made it to the top 300 are IIT Bombay and...
Forbush decrease is a rapid decrease in the observed galactic cosmic ray intensity pattern followed by a coronal mass ejection. In the present paper we have analyzed the daily sampled Forbush decrease indices from January, 1967 to December, 2003 generated in IZMIRAN, Russia. Prediction of this astrophysical parameter has been performed using Takagi-Sugeno type Adaptive Neuro-Fuzzy Inference Systems...
In this paper we have analyzed the total solar irradiance signal obtained from Earth Radiation Budget Satellite. After denoising this signal using simple exponential smoothing we experimented with this filtered signal to study its nature. Fractal dimension analysis has been applied on it and the obtained value of fractal dimension demonstrates anti-persistent behaviour (short memory process) which...
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