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G. Rajesh Kannan,P. Sathiya,T. Deepan Bharathi Kannan,M. Bhuvanesh Kumar 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
In this work, the technique of spin arc welding has been used to weld HSLA steel of grade 15CDV6. Experiments wereperformed according to the L9 Taguchi matrix using current, travel speed, wire feed rate, and spin rotation speed as inputparameters. The quality of the weld was analysed by measuring the bead geometry and microhardness. The Whale OptimizationAlgorithm (WOA) was used to identify the optimized welding parameters. The optimised parameters were identifiedthrough WOA as follows: current 230 A, voltage 24 V, travel speed 720 mm/min, and spin rotation speed 1500 rpm. Thepost-weld heat treatment (PWHT) was performed on the optimised welded sample to enhance the weld properties. Themicrohardness was increased by 79% after PWHT. Ferrite content was found to have reduced after welding and PWHT thegrain size and structure of the BM, HAZ, and WM were analysed by EBSD technique. The decrease in ferrite content hada significant effect on the microhardness. The Energy Dispersive Spectroscopy results showed the presence of Vanadiumcarbide (VC) precipitates which helped in increasing the microhardness.
FUZZY ERROR MATRIX IN CLSSIFICATION PROBLEMS
Kannan, S.R.,Ramathilagam, S.R. Korean Society of Computational and Applied Mathem 2008 Journal of applied mathematics & informatics Vol.26 No.5
This paper concerns a new method called Fuzzy Supervised Method for error matrix, the method has developed based on Adoptive Neuro- Fuzzy Inference Systems(ANFIS). For the performance point of view initially the new method tested with trial data and then this paper applies the proposed method with real world problems. So that this paper generated 1000 random error matrices in programming language [R] and then it tests the new proposed method for the error matrices. The results of Fuzzy Supervised Method given in terms of Kappa Index and Congalton Accuracy Indexes, and performance of Fuzzy Supervised Method has evaluated by using Pearson's test.
Kannan, Ramanujam,Kim, Ae Rhan,Nahm, Kee Suk,Yoo, Dong Jin American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.3
<P>The development of a facile, instep, and eco-friendly synthesis method of mono-dispersed low quantity palladium nanoparticle/carbon@functionllized carbon nanotube composite (Pd@C-f-CNT) electrocatalytic material was developed for use in the electrooxidation of xylitol. The prepared nanocatalyst was analyzed by powder X-ray diffraction analysis, Raman spectroscopy, X-ray photoelectron spectroscopy, and scanning and transmission electron microscopy. The electrocatalytic studies were performed using voltammetric methods. Formation of Pd NPs was observed within 2 min. The microscopic analysis showed 5- to 10-nm-sized Pd NPs that uniformly covered the CNT. The instep-formed carbon helped to improve the electrocatalytic activity of the catalyst. Our proposed method provides new insight for the development of highly efficient metal NPs/CNT nanocatalyst for direct alcohol fuel cell applications.</P>
Kannan, R.,Kim, A.R.,Nahm, K.S.,Yoo, D.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.16
<P>The formation of organic poisoning intermediate species during fuel (alcohol) oxidation over a noble-metal catalyst electrode retards the electrooxidation reaction. To address this problem, we report the synthesis of a manganese-titanium-oxide-hydroxide-supported palladium nanocatalyst (Pd@MTOH), whereby a hydrothermal reaction is followed by an in situ reduction process. The physical characterizations confirm the formation of Pd NPs and a mixed-valance MTOH. The voltammetric-study results for the Pd@MTOH show a high level of electrochemical activity toward alcohol (methanol, ethylene glycol, and xylitol), and oxidation toward the Pd@MnOOH and Pd@C electrodes. At the Pd@MTOH electrode, the poisonous intermediate species that were formed during alcohol electrooxidation were successfully removed at a higher forward potential; the excellent catalytic activity, better intermediate tolerance, and sound long-term stability of the Pd@MTOH electrode can be credited to the uniform dispersion of the Pd NPs and the support (MTOH). This work outlines a facile method for the fabrication of a catalyst with a high electrochemical performance and great potential in alcohol fuel-cell applications. Copyright (C) 2016, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
CRYPTOGRAPHIC ALGORITHM INVOLVING THE MATRIX Q<sup>p*</sup>
Kannan, J.,Mahalakshmi, M.,Deepshika, A. The Kangwon-Kyungki Mathematical Society 2022 한국수학논문집 Vol.30 No.3
Cryptography is one of the most essential developing areas, which deals with the secure transfer of messages. In recent days, there are more number of algorithms have been evolved to provide better security. This work is also such an attempt. In this paper, an algorithm is presented for encryption and decryption which employs the matrix Q<sup>p*</sup> and the well- known equation x<sup>2</sup> - py<sup>2</sup> = 1 where p is a prime.
Kannan Pugazhendhi,Raghunathan Malathi,Mohan Thangarajeswari,Palanivelu Shanthi,Periandavan Kalaiselvi 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.3
BACKGROUND: Endogenous pancreatic b-cell regeneration is a promising therapeutic approach for enhancing b-cell function and neogenesis in diabetes. Various findings have reported that regeneration might occur via stimulating b-cell proliferation, neogenesis, or conversion from other pancreatic cells to b-like cells. Although the current scenario illustrates numerous therapeutic strategies and approaches that concern endogenous b-cell regeneration, all of them have not been successful to a greater extent because of cost effectiveness, availability of suitable donors and rejection in case of transplantation, or lack of scientific evidence for many phytochemicals derived from plants that have been employed in traditional medicine. Therefore, the present study aims to investigate the effect of gymnemic acid (GA) on b-cell regeneration in streptozotocin-induced type 1 diabetic rats and high glucose exposed RIN5-F cells. METHODS: The study involves histopathological and immunohistochemical analysis to examine the islet’s architecture. Quantitative polymerase chain reaction (qPCR) and/or immunoblot were employed to quantify the b-cell regeneration markers and cell cycle proliferative markers. RESULTS: The immunoexpression of E-cadherin, b-catenin, and phosphoinositide 3-kinases/protein kinase B were significantly increased in GA-treated diabetic rats. On the other hand, treatment with GA upregulated the pancreatic regenerative transcription factor viz. pancreatic duodenal homeobox 1, Neurogenin 3, MafA, NeuroD1, and b-cells proliferative markers such as CDK4, and Cyclin D1, with a simultaneous downregulation of the forkhead box O, glycogen synthase kinase-3, and p21cip1 in diabetic treated rats. Adding to this, we noticed increased nuclear localization of Pdx1 in GA treated high glucose exposed RIN5-F cells. CONCLUSION: Our results suggested that GA acts as a potential therapeutic candidate for endogenous b-cell regeneration in treating type 1 diabetes.
Kannan, Aravindaraj G.,Samuthirapandian, Amaresh,Kim, Dong-Won Elsevier 2017 Journal of Power Sources Vol.337 No.-
<P><B>Abstract</B></P> <P>Hierarchically porous graphene nanosheets co-doped with nitrogen and sulfur are synthesized via a simple hydrothermal method, followed by a pore activation step. Pore architectures are controlled by varying the ratio of chemical activation agents to graphene, and its influence on the capacitive performance is evaluated. The electric double layer capacitor (EDLC) assembled with optimized dual-doped graphene delivers a high specific capacitance of 146.6 F g<SUP>−1</SUP> at a current density of 0.8 A g<SUP>−1</SUP>, which is higher than that of cells with un-doped and single-heteroatom doped graphene. The EDLC with dual-doped graphene electrodes exhibits stable cycling performance with a capacitance retention of 94.5% after 25,000 cycles at a current density of 3.2 A g<SUP>−1</SUP>. Such a good performance can be attributed to synergistic effects due to co-doping of the graphene nanosheets and the presence of hierarchical porous structures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen and sulfur co-doped, hierarchically porous graphene is synthesized. </LI> <LI> EDLC with co-doped graphene exhibits high capacitance and good cycling stability. </LI> <LI> Good performance is attributed to co-doping and hierarchical porous structures. </LI> </UL> </P>
( Kannan Karunakaran ),( Subramanian Balaji ),문일식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The room temperature ionic liquids (RTILs) find use in many electrochemical applications such as electro deposition, development of gas sensors, organic synthesis, catalysis, solar cells and batteries, synthesis of novel nanostructured materials etc., due to their unique physicochemical properties. In the present report, we present the results of benzene oxidation catalyzed by Co(II) dissolved in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([bmpyr]+[TFSI]-). In this reaction Co(II) acts as the mediator species and first get oxidized to Co(III). This oxidized species when comes in contact with organic compound oxidizes the organic and getting reduced to Co(I). We have carried out the cyclic voltammetric investigations of Co(II) oxidation and mediated oxidation of benzene. The galvanostatic electrolysis carried out confirmed the catalyzing nature of Co(II) and the oxidation of benzene to benzoquinone.