An Evolutionary Optimized Algorithm Approach to Compensate the Non-linearity in Linear Variable Displacement Transducer Characteristics

Murugan, S.,Umayal, S.P. The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6

Linearization of transducer characteristic plays a vital role in electronic instrumentation because all transducers have outputs nonlinearly related to the physical variables they sense. If the transducer output is nonlinear, it will produce a whole assortment of problems. Transducers rarely possess a perfectly linear transfer characteristic, but always have some degree of non-linearity over their range of operation. Attempts have been made by many researchers to increase the range of linearity of transducers. This paper presents a method to compensate nonlinearity of Linear Variable Displacement Transducer (LVDT) based on Extreme Learning Machine (ELM) method, Differential Evolution (DE) algorithm and Artificial Neural Network (ANN) trained by Genetic Algorithm (GA). Because of the mechanism structure, LVDT often exhibit inherent nonlinear input-output characteristics. The best approximation capability of optimized ANN technique is beneficial to this. The use of this proposed method is demonstrated through computer simulation with the experimental data of two different LVDTs. The results reveal that the proposed method compensated the presence of nonlinearity in the displacement transducer with very low training time, lowest Mean Square Error (MSE) value and better linearity. This research work involves less computational complexity and it behaves a good performance for nonlinearity compensation for LVDT and has good application prospect.

Weldability and Fracture Behaviour of Low Carbon Steel/Aluminium/Stainless Steel Clad Sheet with Resistance Spot Welding

Murugan, S. P.,Cheepu, M.,Nam, D. G.,Park, Y. D. Springer Science + Business Media 2017 Transactions of the Indian Institute of Metals Vol.70 No.3

<P>This paper focuses on the resistance spot welding of low carbon steel/aluminium/stainless steel 3-ply clad sheet. Weldability, microstructure, tensile properties and fracture behaviour of the clad sheet with resistance spot welding were evaluated. A 'squeeze-out pulse' was used to melt and squeeze out the core aluminium completely from the vicinity of the weld zone before the application of actual welding current. This enabled the clad sheet to be welded without the formation of any Fe-Al intermetallic compound layer in the weld zone. The fracture mode associated with the peel test of the spot weld was used as the criterion for resistance spot weldability evaluation of the clad sheet. A weldability lobe diagram in the welding current-welding time space based on the fracture mode was constructed and it revealed a wide weldable window especially at a welding time of 18 cy. A tensile shear test with a cross head speed of 1 mm/min was conducted to study the tensile strength and fracture behaviour. It revealed four different fracture modes namely button pull, clad-bond fracture, partial thickness-partial clad-bond fracture and interfacial fracture. The nugget size and melting of clad interface and stainless steel layer were the dominant factors in determining the fracture mode.</P>

Some Cycle and Star Related Nordhaus-Gaddum Type Relations on Strong Efficient Dominating Sets

Murugan, Karthikeyan Department of Mathematics 2019 Kyungpook mathematical journal Vol.59 No.3

Let G = (V, E) be a simple graph with p vertices and q edges. A subset S of V (G) is called a strong (weak) efficient dominating set of G if for every $v{\in}V(G)$ we have ${\mid}N_s[v]{\cap}S{\mid}=1$ (resp. ${\mid}N_w[v]{\cap}S{\mid}=1$), where $N_s(v)=\{u{\in}V(G):uv{\in}E(G),\;deg(u){\geq}deg(v)\}$. The minimum cardinality of a strong (weak) efficient dominating set of G is called the strong (weak) efficient domination number of G and is denoted by ${\gamma}_{se}(G)$ (${\gamma}_{we}(G)$). A graph G is strong efficient if there exists a strong efficient dominating set of G. In this paper, some cycle and star related Nordhaus-Gaddum type relations on strong efficient dominating sets and the number of strong efficient dominating sets are studied.

Mode of embrittler transport and failure mechanism in Zn-assisted LME cracking in resistance spot welding of galvannealed TRIP steel

Murugan Siva Prasad,박영도,전종배,지창욱 대한용접·접합학회 2020 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2020 No.11

Metabolic Responses of Tea ($Camellia$ sp.) to Exogenous Application of Ascorbic Acid

Murugan, Amarchand Chordia,Thomas, Jibu,Rajagopal, Raj Kumar,Mandal, Abul Kalam Azad 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.1

Effects of exogenous application of ascorbic acid on physiological and metabolic changes in tea were investigated in the present study. The highest improvement in yield was evident in response to regular application (a day after every harvest) of ascorbic acid at 600 ppm followed by 400 ppm. Foliar application of ascorbic acid (600 ppm) at regular intervals enhanced chlorophyll a and b contents besides a significant increase in total polyphenols and catechins when compared to the untreated control. Exogenous application of ascorbic acid at alternate harvesting rounds increased the activity of polyphenol oxidase whereas ascorbate peroxidase remained unchanged. An increase in phenylalanine ammonia lyase activity was noticed with foliar application of ascorbic acid irrespective of its concentrations. Theaflavins and thearubigins of made tea showed an increase when ascorbic acid was applied with 400 and 600 ppm at alternate intervals. The scores of brewed tea liquor characteristics, viz. infusion, color, strength, and briskness were higher even at the lower concentration of ascorbic acid treatment. Results suggest that foliar application of ascorbic acid (400 ppm) proved to be a useful measure to improve the yield, physiological attributes, and antioxidant properties of tea.

Grafting of Glycidyl Methacrylate upon Coralline Hydroxyapatite in Conjugation with Demineralized Bone Matrix Using Redox Initiating System

Murugan, R.,Rao, K.Panduranga The Polymer Society of Korea 2003 Macromolecular Research Vol.11 No.1

Grafting of glycidyl methacrylate (GMA) upon coralline hydroxyapatite in conjugation with demineralized bone matrix (CHA-DBM) using equal molar ratio of potassium persulfate/sodium metabisulfite redox initiating system was investigated in aqueous medium. The optimum reaction condition was standardized by varying the concentrations of backbone, monomer, initiator, temperature and time. The results obtained imply that the percent grafting was found to increase initially and then decrease in most of the cases. The optimum temperature and time were found to be 50 $^{\circ}C$ and 180 min, respectively, to obtain higher grafting yield. Fourier transform infrared (FT-IR) spectroscopy and X-ray powder diffraction (XRD) method were employed for the proof of grafting. The FT-IR spectrum of grafted CHA-DBM showed epoxy groups at 905 and 853 $cm^{-1}$ / and ester carbonyl group at 1731 $cm^{-1}$ / of poly(glycidyl methacrylate) (PGMA) in addition to the characteristic absorptions of CHA-DBM, which provides evidence of the grafting. The XRD results clearly indicated that the crystallographic structure of the grafted CHA-DBM has not changed due to the grafting reaction. Further, no phase transformation was detected by the XRD analysis, which suggests that the PGMA is grafted only on the surface of CHA-DBM backbone. The grafted CHA-DBM will have better functionality because of their surface modification and hence they may be more useful in coupling of therapeutic agents through epoxy groups apart from being used as osteogenic material.

Synthesis of stimuli responsive boronic acid functional bearing polyaniline nanofiber for electrochemical sensor applications

( Murugan Thiruppathi ),( Jyh-myng Zen ) 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.-

Fibre Rupture Phenomenon in Rotor Spinning

Murugan, R.,Dasaradan, B.S.,Karnan, P.,Senthilkannan, M. Subramanian The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.6

The present work relates to the occurrence of fibre rupture during fibre separation in rotor spinning and also discusses the mechanism of such rupture. The reduction in fibre length during opening has been studied at different span lengths. A correlation has been drawn showing the influence of combing roller action on yam tenacity and elongation. Fibre rupture has direct relationship with opening roller speed. Fibre rupture and surface damage occurring due to action of opening roller together are found to mar the yarn quality index.

A Pattern Matching Extended Compression Algorithm for DNA Sequences

Murugan., A,Punitha., K International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.8

DNA sequencing provides fundamental data in genomics, bioinformatics, biology and many other research areas. With the emergent evolution in DNA sequencing technology, a massive amount of genomic data is produced every day, mainly DNA sequences, craving for more storage and bandwidth. Unfortunately, managing, analyzing and specifically storing these large amounts of data become a major scientific challenge for bioinformatics. Those large volumes of data also require a fast transmission, effective storage, superior functionality and provision of quick access to any record. Data storage costs have a considerable proportion of total cost in the formation and analysis of DNA sequences. In particular, there is a need of highly control of disk storage capacity of DNA sequences but the standard compression techniques unsuccessful to compress these sequences. Several specialized techniques were introduced for this purpose. Therefore, to overcome all these above challenges, lossless compression techniques have become necessary. In this paper, it is described a new DNA compression mechanism of pattern matching extended Compression algorithm that read the input sequence as segments and find the matching pattern and store it in a permanent or temporary table based on number of bases. The remaining unmatched sequence is been converted into the binary form and then it is been grouped into binary bits i.e. of seven bits and gain these bits are been converted into an ASCII form. Finally, the proposed algorithm dynamically calculates the compression ratio. Thus the results show that pattern matching extended Compression algorithm outperforms cutting-edge compressors and proves its efficiency in terms of compression ratio regardless of the file size of the data.

Facile synthesis of interconnected layered porous carbon framework for high-performance supercapacitors

Murugan Nagaraj,Thangarasu Sadhasivam,Seo Sol Bin,Choi Yu Rim,Magdum Sahil S.,Oh Tae Hwan,Yoong Ahm Kim 한국탄소학회 2023 Carbon Letters Vol.33 No.3

Biomass-derived porous carbon is an excellent scientific and technologically interesting material for supercapacitor applications. In this study, we developed biomass-derived nitrogen-doped porous carbon nanosheets (BDPCNS) from cedar cone biomass using a simple KOH activation and pyrolysis method. The BDPCNS was effectively modified at different temperatures of 600 °C, 700 °C, and 800 ℃ under similar conditions. The as-prepared BDPCNS-700 electrode exhibited a high BET surface area of 2883 m2 g−1 and a total pore volume of 1.26 cm3 g−1. Additionally, BDPCNS-700 had the highest electrical conductivity (11.03 cm−1) and highest N-doped content among the different electrode materials. The BDPCNS-700 electrode attained a specific capacitance of 290 F g−1 at a current density of 1 A g−1 in a 3 M KOH electrolyte and an excellent long-term electrochemical cycling stability of 93.4% over 1000 cycles. Moreover, the BDPCNS-700 electrode had an excellent energy density (40.27 Wh kg−1) vs power density (208.19 W kg−1). These findings indicate that BDPCNS with large surface areas are promising electrode materials for supercapacitors and energy storage systems.