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Dimensionality Reduction Using Optimized Self-Organized Map Technique for Hyperspectral Image Classification

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Computer Systems Science & Engineering 2023年第11期47卷 2481-2496页

作者： S.srinivasan K.Rajakumar School of Computer Science and Engineering VIT UniversityVellore632014India

The high dimensionalhyperspectral image classification is a challenging task due to the spectral feature *** high correlation between these features and the noises greatly affects the classification *** overcome this,dimensionality reduction techniques are widely *** image processing applications recently propose numerous deep learning ***,in hyperspectral image classification,the features of deep learning models are less ***,for efficient hyperspectral image classification,a depth-wise convolutional neural network is presented in this research *** handle the dimensionality issue in the classification process,an optimized self-organized map model is employed using a water strider optimization *** network parameters of the self-organized map are optimized by the water strider optimization which reduces the dimensionality issues and enhances the classification *** datasets such as Indian Pines and the University of Pavia(UP)are considered for experimental *** dimensionality reduction methods like Enhanced Hybrid-Graph Discriminant Learning(EHGDL),local geometric structure Fisher analysis(LGSFA),Discriminant Hyper-Laplacian projection(DHLP),Group-based tensor model(GBTM),and Lower rank tensor approximation(LRTA)methods are compared with proposed optimized SOM *** confirm the superior performance of the proposed model of 98.22%accuracy for the Indian pines dataset and 98.21%accuracy for the University of Pavia dataset over the existing maximum likelihood classifier,and Support vector machine(SVM).

关键词： Hyperspectral image dimensionality reduction depth-wise separable model water strider optimization self-organized map

Template-Based Gait Authentication Through Bayesian Thresholding

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IEEE/CAA Journal of Automatica Sinica 2019年第1期6卷 209-219页

作者： Ebenezer R.H.P.Isaac Susan Elias srinivasan Rajagopalan K.S.Easwarakumar IEEE the Department of Computer Science and Engineering Indian Institute of Technology Madras the School of Electronics Engineering VIT University the Department of Physiology and Biomedical Engineering Mayo Clinic the Department of Computer Science and Engineering Anna University

While gait recognition is the mapping of a gait sequence to an identity known to the system, gait authentication refers to the problem of identifying whether a given gait sequence belongs to the claimed identity. A typical gait authentication system starts with a feature representation such as a gait template, then proceeds to extract its features, and a transformation is ultimately applied to obtain a discriminant feature set. Almost every authentication approach in literature favours the use of Euclidean distance as a threshold to mark the boundary between a legitimate subject and an impostor. This article proposes a method that uses the posterior probability of a Bayes' classifier in place of the Euclidean distance. The proposed framework is applied to template-based gait feature representations and is evaluated using the standard CASIA-B gait database. Our study experimentally demonstrates that the Bayesian posterior probability performs significantly better than the de facto Euclidean distance approach and the cosine distance which is established in research to be the current state of the art.

关键词： Bayes’ rule biometrics gait recognition linear discriminant analysis verification

Effects of gadolinium addition on the microstructure and mechanical properties of Mg–9Al alloy

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International Journal of Minerals,Metallurgy and Materials 2017年第8期24卷 901-908页

作者： Lavish Kumar Singh Alok Bhadauria Amirthalingam srinivasan Uma Thanu Subramonia Pillai Bellambettu Chandrasekhara Pai Department of Metallurgical and Materials Engineering Indian Institute of Technology Kharagpur Materials Science and Technology Division National Institute for Interdisciplinary Science and Technology

This research aims to study the significance of Gd addition(0wt%–2wt%) on the microstructure and mechanical properties of Mg–9Al alloy. The effect of Gd addition on the microstructure was investigated via X-ray diffraction(XRD), optical microscopy, scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The Mg–9Al alloy contained two phases, α-Mg and β-Mg_(17)Al_(12). Alloying with Gd led to the emergence of a new rectangular-shaped phase, Al_2Gd. The grain size also decreased marginally upon Gd addition. The ultimate tensile strength and microhardness of Mg–9Al alloy increased by 23% and 19%, respectively, upon 1.5wt% Gd addition. We observed that, although Mg–9Al–2.0Gd alloy exhibited the smallest grain size(181 μm) and the highest dislocation density(5.1 × 10^(10) m^(-2)) among the investigated compositions, the Mg–9Al–1.5Gd alloy displayed the best mechanical properties. This anomalous behavior was observed because the Al_2Gd phase was uniformly distributed and present in abundance in Mg–9Al–1.5Gd alloy, whereas it was coarsened and asymmetrically conglomerated in Mg–9Al–2.0Gd.

关键词： magnesium rare earth alloying gadolinium microstructure mechanical properties

In silico prediction of monovalent and chimeric tetravalent vaccines for prevention and treatment of dengue fever

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The Journal of Biomedical Research 2018年第3期32卷 222-236页

作者： Vijayakumar Subramaniyan Ramesh Venkatachalam Prabhu srinivasan Manogar Palani Computational Phytochemistry Laboratory P.G. and Research Department of Botany and Microbiology A.V.V.M. Sri Pushpam College (Autonomous)

Reverse vaccinology method was used to predict the monovalent peptide vaccine candidate to produce antibodies for therapeutic purpose and to predict tetravalent vaccine candidate to act as a common vaccine to cover all the dengue virus serotypes. Envelope（E）-proteins of DENV-1-4 serotypes were used for vaccine prediction using NCBI,Uniprot/Swissprot, Swiss-prot viewer, VaxiJen V2.0, TMHMM, BCPREDS, Propred-1, Propred and MHC Pred. Eproteins of DENV-1-4 serotypes were identified as antigen from which T cell epitopes, through B cell epitopes, were predicted to act as peptide vaccine candidates. Each selected T cell epitope of E-protein was confirmed to act as vaccine and to induce complementary antibody against particular serotype of dengue virus. Chimeric tetravalent vaccine was formed by the conjugation of four vaccines, each from four dengue serotypes to act as a common vaccine candidate for all the four dengue serotypes. It can be justifiably concluded that the monovalent 9-mer T cell epitope for each DENV serotype can be used to produce specific antibody against dengue virus and a chimeric common tetravalent vaccine candidate to yield a comparative vaccine to cover any of the four dengue virus serotype. This vaccine is expected to be highly immunogenic against dengue fever.

关键词： dengue serotypes dengue virus vaccine E-proteins MHC Ⅰ and Ⅱ

Thermophoresis and Brownian motion effects on boundary layer flow of nanofluid in presence of thermal stratification due to solar energy

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Applied Mathematics and Mechanics(English Edition) 2012年第6期33卷 765-780页

作者： N.ANBUCHEZHIAN K.srinivasan K.CHANDRASEKARAN R.KANDASAMY Department of Mechanical Engineering Sri Guru Institute of Technology Department of Mechanical Engineering Anna University Department of Mechanical Engineering R.M.K.Engineering College Research Centre for Computational Mathematics Faculty of ScienceTechnology and Human DevelopmentUniversiti Tun Hussein Onn Malaysia

The problem of laminar fluid flow, which results from the stretching of a vertical surface with variable stream conditions in a nanofluid due to solar energy, is in- vestigated numerically. The model used for the nanofluid incorporates the effects of the Brownian motion and thermophoresis in the presence of thermal stratification. The sym- metry groups admitted by the corresponding boundary value problem are obtained by using a special form of Lie group transformations, namely, the scaling group of transfor- mations. An exact solution is obtained for the translation symmetrys, and the numerical solutions are obtained for the scaling symmetry. This solution depends on the Lewis number, the Brownian motion parameter, the thermal stratification parameter, and the thermophoretic parameter. The conclusion is drawn that the flow field, the temperature, and the nanoparticle volume fraction profiles are significantly influenced by these param- eters. Nanofluids have been shown to increase the thermal conductivity and convective heat transfer performance of base liquids. Nanoparticles in the base fluids also offer the potential in improving the radiative properties of the liquids, leading to an increase in the efficiency of direct absorption solar collectors.

关键词： solar radiation Brownian motion nanofluid thermophoresis thermalstratification

Antioxidant mediated response of Scoparia dulcis in noise-induced redox imbalance and immunohistochemical changes in rat brain

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The Journal of Biomedical Research 2017年第2期31卷 143-153页

作者： Wankupar Wankhar Sakthivel srinivasan Ravindran Rajan Rathinasamy Sheeladevi Department of Physiology Dr. ALM PG Institute of Basic Medical Sciences University of Madras Taramani CampusChennai 600 113 India.

Noise has been regarded as an environmental/occupational stressor that causes damages to both auditory and non- auditory organs. Prolonged exposure to these mediators of stress has often resulted in detrimental effect, where oxidative/nitrosative stress plays a major role. Hence, it would be appropriate to examine the possible role of free radicals in brain discrete regions and the ＂antioxidants＂ mediated response of S. dulcis. Animals were subjected to noise stress for 15 days （100 dB/4 hours/day） and estimation of endogenous free radical and antioxidant activity were carried out on brain discrete regions （the cerebral cortex, cerebellum, brainstem, striatum, hippocampus and hypothalamus）. The result showed that exposure to noise could alleviate endogenous free radical generation and altered anfioxidant status in brain discrete regions when compared to that of the control groups. This alleviated free radical generation （H202 and NO） is well supported by an upregulated protein expression on immunohistochemistry of both iNOS and nNOS in the cerebral cortex on exposure to noise stress. These findings suggest that increased free radical generation and altered anti-oxidative status can cause redox imbalance in the brain discrete regions~ However, free radical scavenging activity of the plant was evident as the noise exposed group treated with S. dulcis[200 mg/（kg · b. w）] displayed a therapeutic effect by decreasing the free radical level and regulate the anti-oxidative status to that of control animals. Hence, it can be concluded that the efficacy of S. dulcis could be attributed to its free radical scavenging activity and anti-oxidative property.

关键词： free radicals oxidative stress S. dulcis nitric oxide synthase nitric oxide hydrogen peroxide

Performance of two complementary machine-learned potentials in modelling chemically complex systems

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npj Computational Materials 2023年第1期9卷 1008-1022页

作者： Konstantin Gubaev Viktor Zaverkin Prashanth srinivasan Andrew Ian Duff Johannes Kästner Blazej Grabowski Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Institute for Theoretical Chemistry University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Scientific Computing Department STFC Daresbury LaboratoryWarrington WA44ADUK Present address:NEC Laboratories Europe GmbH Kurfürsten-Anlage 3669115 HeidelbergGermany

Chemically complex multicomponent alloys possess exceptional properties derived from an inexhaustible compositional *** complexity however makes interatomic potential development *** explore two complementary machine-learned potentials—the moment tensor potential(MTP)and the Gaussian moment neural network(GM-NN)—in simultaneously describing configurational and vibrational degrees of freedom in the Ta-V-Cr-W alloy *** models are equally accurate with excellent performance evaluated against *** achieve root-mean-square-errors(RMSEs)in energies of less than a few meV/atom across 0 K ordered and high-temperature disordered configurations included in the *** for compositions not in training,relative energy RMSEs at high temperatures are within a few meV/***-temperature molecular dynamics forces have similarly small RMSEs of about 0.15 eV/Åfor the disordered quaternary included in,and ternaries not part of *** achieve faster convergence with training size;GM-NNs are faster in *** learning is partially beneficial and should be complemented with conventional human-based training set generation.

关键词： alloy faster complex

Emerging rechargeable aqueous aluminum ion battery:Status,challenges,and outlooks

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Nano Materials Science 2020年第3期2卷 248-263页

作者： Du Yuan Jin Zhao William Manalastas Jr Sonal Kumar Madhavi srinivasan Energy Research Institute Nanyang Technological University637553Singapore School of Materials Science and Engineering Nanyang Technological University639798Singapore

Aluminum ion battery(AIB)technology is an exciting alternative for post-lithium energy *** based on ionic liquids have enabled advances in both cathode material development and fundamental understanding on ***,unlocking chemistry in rechargeable aqueous aluminum ion battery(AAIB)provides impressive prospects in terms of kinetics,cost,safety considerations,and ease of *** review the progress on AAIB,we discuss the critical issues on aluminum electrochemistry in aqueous system,cathode material design to overcome the drawbacks by multivalent aluminum ions,and challenges on electrolyte design,aluminum stripping/plating,solid-electrolyte interface(SEI)formation,and design of cathode *** review aims to stimulate exploration of high-performance AAIB and rationalize feasibility grounded on underlying reaction mechanisms.

关键词： Aluminum ion battery Aqueous aluminum ion battery Rechargeable Al stripping/plating SEI

Rainfall partitioning in young clonal plantations Eucalyptus species in a subtropical environment,and implications for water and forest management

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International Soil and Water Conservation Research 2021年第3期9卷 474-484页

作者： Decio Oscar Cardoso Ferreto JoséMiguel Reichert Rosane Barbosa Lopes Cavalcante Raghavan srinivasan Soils Department Universidade Federal de Santa Maria(UFSM).Avenida Romima 1000Santa MariaRSBrazil Instituto Tecnoldgico Vale.Rua Boaventura da Silva 955UmarizalBelemPABrazil Department of Ecology and Conservation Biology Texas A&M University(TAMU)534 John Kimbrough Blvd.Room 305College StationTXUSA

Different canopy characteristics of industrial eucalyptus may lead to differences in water evaporation and availability to *** study aims to understand rainfall partitioning in a young clonal plantation(age of 2-4.5 years)of three eucalyptus species by relating tree parameters:diameter at breast height,total height,and leaf area *** measured rainfall,throughfall,stemflow and litter interception,along with the tree *** eucalyptus trees had rainfall interception varying between 22 mm(for 178 mm of rainfall)and 42 mm(for 87 mm of te rainfall),throughfall between 106 mm(for 186 mm of rainfall)and 44 mm(for 74 mm of rainfall),and stemflow between 0.5 mm(for 92 mm of rainfall)and 1.4 mm(for 24 mm of rainfall).For the three species,rainfall interception varied between 12 and 48%,throughfall between 57 and 90%,and stemflow between 0.3 and 5.4%.The coefficient of determination between interception and rainfall was 0.76,indicating interception depends on other variables,possibly including antecedent rainfall,rainfall intensity,and *** decreased with a reduction in leaf area index caused by eucalyptus *** *** had 0.75 mm of throughfall per 1 mm of rainfall,whereas in *** and E saligna,these ratios were 0.71 and 0.68,*** in *** and *** had a higher positive relationship with the diameter at breast height of the trees,whereas in *** the highest relationship was with the *** results contribute to establishing management strategies,such as choosing suitable eucalyptus species to local climate,and to improve the synchronization of crop-demand versus soil-water-supply while maintaining streamflow to fulfill ecological and production needs.

关键词： Water balance Blue-green water Forest hydrology Rainfall interception Rainfall throughfall