Comparative Study on Thresholding

Criterion based thresholding algorithms are simple and effective for two-level thresholding. However, if a multilevel thresholding is needed, the computational complexity will exponentially increase and the performance may become unreliable. In this approach, a novel and more effective method is used for multilevel thresholding by taking hierarchical cluster organization into account. Developing a dendogram of gray levels in the histogram of an image, based on the similarity measure which involves the inter-class variance of the clusters to be merged and the intra-class variance of the new merged cluster . The bottom-up generation of clusters employing a dendogram by the proposed method yields good separation of the clusters and obtains a robust estimate of the threshold. Such cluster organization will yield a clear separation between object and background even for the case of nearly unimodal or multimodal histogram. Since the hierarchical clustering method performs an iterative merging operation, it is extended to multilevel thresholding problem by eliminating grouping of clusters when the pixel values are obtained from the expected numbers of clusters. This paper gives a comparison on Otsu’s & Kwon’s criterion with hierarchical based multi-level thresholding

A fuzzy self-tuning PI controller for HVDC links

10.1109/63.535399IEEE Transactions on Power Electronics115669-679ITPE

Fuzzy and neural controllers for dynamic systems: An overview

Proceedings of the International Conference on Power Electronics and Drive Systems2810-81685RT

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Not AvailableDirect sequencing of mitochondrial DNA regions such as cytochrome b, ATPase 6/8 and control region was performed to study comparative and evolutionary status of the three mitochondrial genes in Labeo rohita, Catla catla and Cirrhinus mrigala. DNA sequence alignment among species using specific software revealed comparative rates of divergence with considerably faster and more heterogeneous substitution rate for control region as compared to cytochrome b and ATPase 6/8. Despite the relatively high variability of control region, the overall levels of sequence divergence were low in coding regions. Two protein coding genes and the control region with varying degree of sequence divergence established two distinct groups which are genetically distant from each other exhibiting identical phylogenetic structure in IMCs. Closest relationship was between Labeo rohita and Catla catla indicating that they might have diverged from a common ancestral stock in genealogical lineage whereas Cirrhinus mrigala showed greater divergence with all the three DNA regions studied. Findings of this study will help to understand evolution of mitochondrial DNA genes in carps and facilitate future investigations on phylogeographic structure of Indian carps.Not Availabl

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Not AvailableThe fringe lipped peninsula carp, Labeo fimbriatus, is native to lower peninsular region of India. It is a commercially important species widely fished and consumed throughout much of the tropical and subtropical region of south India. Knowledge of genetic diversity of this species is important to support management and conservation programmes which will subsequently help in sustainable production of this species. DNA markers, mostly microsatellites are excellent tools for evaluation of genetic variation of populations. However, development of these markers from each species is time consuming and costly. Therefore, we studied the usefulness of heterologous markers by assessing the genetic variation of three populations of L. fimbriatus. We examined population structure of L. fimbriatus from different riverine locations in India using rohu microsatellite loci. Out of 30 rohu microsatellite loci, 15 produced amplified products having unambiguous band pattern with clarity in allele scoring. Therefore, these 15 loci were used in 110 samples of L. fimbriatus collected from river Krishna (Vijayawada; n= 30), river Kaveri (Bengaluru; n=50) and river Mahanadi (Sambalpur; n=30). Out of 15 loci, only 3 loci were polymorphic in all the populations and remaining 12 loci were found to be monomorphic. The range of expected heterozygosity values for these polymorphic loci was 0.597 to 0.602. One locus did not satisfy Hardy–Weinberg equilibrium (p=.004) in Kaveri population. Negative inbreeding coefficients (Fis) were found across populations with no significant population structuring (Fst) indicating existence of panmictic populations. As only 3 loci (20%) out of 15 were polymorphic, use of heterologous primers may not be a choice for population studies in L. fimbriatus.Indian Council of Agricultural research, New Delhi

Measurement of the tt¯ charge asymmetry in events with highly Lorentz-boosted top quarks in pp collisions at s=13 TeV

The measurement of the charge asymmetry in top quark pair events with highly Lorentz-boosted top quarks decaying to a single lepton and jets is presented. The analysis is performed using proton-proton collisions at s=13TeV with the CMS detector at the LHC and corresponding to an integrated luminosity of 138 fb−1. The selection is optimized for top quarks produced with large Lorentz boosts, resulting in nonisolated leptons and overlapping jets. The top quark charge asymmetry is measured for events with a tt¯ invariant mass larger than 750 GeV and corrected for detector and acceptance effects using a binned maximum likelihood fit. The measured top quark charge asymmetry of (0.42−0.69+0.64)% is in good agreement with the standard model prediction at next-to-next-to-leading order in quantum chromodynamic perturbation theory with next-to-leading-order electroweak corrections. The result is also presented for two invariant mass ranges, 750–900 and >900GeV