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Investigation of material removal characteristics of Si(100)wafer during linear field atmospheric-pressure plasma etching

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Nanotechnology and Precision Engineering 2020年第4期3卷 244-249页

作者： Weijia Guo senthil kumar A. Peng Xu Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1117575Singapore Singapore Institute of Manufacturing Technology 73 Nanyang Drive637662Singapore

Atmospheric-pressure(AP)plasma etching provides an alternative method for mechanical grinding to realize wafer thinning of Si *** can avoid the damages and micro-cracks that would be introduced by mechanical stress during the grinding *** this study,the material removal characteristics of Si(100)wafer processed by linear field AP plasma generated using carbon tetrafluoride(CF4)as the reactive source were *** linear field plasma etching tool has a typical removal profile and the depth removal rate that can reach up to 1.082μm/*** effect ofO2 concentration on the removal ratewas discussed and the surfacemorphology during the process was characterized using scanning electron *** is shown that the subsurface damage layer was gradually removed during the etching process and the surface was observed to be smoothened with the increase of the etching *** present work contributes a basic understanding of the linear field AP plasma etching performance with different gas composition and the typical characteristics would be further applied to damage-free precision removal of Si.

关键词： AP plasma etching Removal characteristics Oxygen effect Surface morphology

Analysis on Critical Success Factors for Agile Manufacturing Evaluation in Original Equipment Manufacturing Industry-An AHP Approach

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Chinese Journal of Mechanical Engineering 2016年第5期29卷 880-888页

作者： C Ajay Guru Dev V S senthil kumar Department of Mechanical Engineering CEG Anna University

Manufacturing industries are facing challenges in the implementation of agile manufacturing in their products and processes. Agility is widely accepted as a new competitive concept in the manufacturing sector in fulfilling varying customer demand. Thus, evaluation of agile manufacturing in industries has become a necessity. The success of an organisation depends on its ability to manage finding the critical success factors and give them special and continued attention in order to bring about high performance. This paper proposes a set of critical success factors （CSFs） for evaluating agile manufacturing considered appropriate for the manufacturing sector. The analytical hierarchy process （AHP） method is applied for prioritizing the success factors, by summarizing the opinions of experts. It is believed that the proposed CSFs enable and assist manufacturing industries to achieve a higher performance in agile manufacturing so as to increase competitiveness.

关键词： critical success factor analytic hierarchy process pairwise comparison

Early Detection Glaucoma and Stargardt’s Disease Using Deep Learning Techniques

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Intelligent Automation & Soft Computing 2023年第5期36卷 1283-1299页

作者： Somasundaram Devaraj senthil kumar Arunachalam Department of Electronics and Communication Engineering Sri Shakthi Institute of Engineering and TechnologyCoimabatore641062TamilnaduIndia

Retinal fundus images are used to discover many *** Machine learning algorithms are designed to identify the Glaucoma *** the accuracy and time consumption performance were not *** address this problem Max Pool Convolution Neural Kuan Filtered Tobit Regres-sive Segmentation based Radial Basis Image Classiﬁer(MPCNKFTRS-RBIC)Model is used for detecting the Glaucoma and Stargardt’s disease by early period using higher accuracy and minimal *** MPCNKFTRS-RBIC Model,the ret-inal fundus image is considered as an input which is preprocessed in hidden layer 1 using weighted adaptive Kuanﬁ***,preprocessed retinal fundus is given for hidden layer 2 for extracting the features like color,intensity,texture with higher *** extracting these features,the Tobit Regressive Segmenta-tion process is performed by hidden layer 3 for partitioning preprocessed image within more segments by analyzing the pixel with the extracted features of the fundus ***,the segmented image was given to output *** radial basis function analyzes the testing image region of a particular class as well as training image region with higher accuracy and minimum time *** is performed with retinal fundus image dataset with various perfor-mance metrics namely peak signal-to-noise ratio,accuracy and time,error rate concerning several retina fundus image and image size.

关键词： Glaucoma detection max pool convolution neural network kuanﬁlter radial basis function

Optimal control of alcoholism spreading through awareness over multiplex network

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International Journal of Biomathematics 2021年第6期14卷 33-58页

作者： Padmavathi Ramamoorthi senthil kumar Muthukrishnan Department of Science and Humanities Info Institute of Engineering CoimbatoreIndia Department of Applied Mathematics and Computational Sciences PSG College of Technology CoimbatoreIndia

This paper proposes the SISRS epidemic model to represent alcohol addiction among *** spreading of alcohol addiction is controlled by creating awareness among the people and also by treating them to overcome *** network is used to study the dynamics of *** spreads over the physical contact layer and follows the SISRS process whereas human awareness spreads over the virtual contact layer and follows the UAU *** on the Microscopic Markov Chain Approach competing dynamics of spreading of alcohol addiction and human awareness diffusion are *** conditions for the existence of an alcohol-free population are *** optimal control problem using a suitable cost index is formulated to reduce the alcohol addicts and the optimal control strategy using Pontryagin’s Minimum Principle is *** results are developed to find the effect of various parameters and to analyze the effects of different control *** results obtained from this model are closer to the data collected in the National Survey of Drug Use and Health(NSDUH)from 2002 to 2018.

关键词： Alcohol spreading information diffusion Microscopic Markov Chain Approach optimal control

Unique and hierarchically structured novel Co3O4/NiO nanosponges with superior photocatalytic activity against organic contaminants

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Frontiers of Materials Science 2017年第4期11卷 375-384页

作者： Vahini RAJA senthil kumar PUVANESWARAN Karuthapandian SWAMINATHAN Department of Chemistry VHNSN College Virudhunagar-626001 Tamilnadu India

In the present study, novel Co3O4/NiO nanosponges designed for the photocatalytic degradation of organic contaminants were synthesized by a simple precipitation technique. The formation of sponge-like nanostructures was clearly evident through the TEM analysis. The photocatalytic efficiency was tested against rhodamine B （RhB） and congo red （CR） dye solutions. Co3O4/NiO nanosponges showed excellent and enhanced photocatalytic efficacy compared to those of Co3O4, NiO nanoparticles, and standards like Ti02 and ZnO. The influence of paramount important operational parameters was explored and the conditions for the best photocatalytic efficiency were optimized. The trapping experiment revealed that the reactive oxygen species （ROS） identified was · OH radical. These findings certainly open up a new way for synthesizing a morphology dependent photocatalyst.

关键词： Co3O4/NiO nanosponges photocatalytic efficacy visible light

Optimizing pulsed current gas tungsten arc welding parameters of AA6061 aluminium alloy using Hooke and Jeeves algorithm

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中国有色金属学会会刊：英文版 2008年第5期18卷 1028-1036页

作者： S.BABU T.senthil kumar V.BALASUBRAMANIAN Centre for Materials Joining Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar-608 002Tamil NaduIndia Department of Automobile Technology Bharathidasan Institute of TechnologyAnna UniversityTiruchirappalli-620 016Tamil NaduIndia

Though the preferred welding process to weld aluminium alloy is frequently constant current gas tungsten arc welding (CCGTAW),it resulted in grain coarsening at the fusion zone and heat affected zone(HAZ).Hence,pulsed current gas tungsten arc welding(PCGTAW) was performed,to yield finer fusion zone grains,which leads to higher strength of AA6061 (Al-Mg-Si) aluminium alloy *** order to determine the most influential control factors which will yield minimum fusion zone grain size and maximum tensile strength of the joints,the traditional Hooke and Jeeves pattern search method was *** experiments were carried out based on central composite design with 31 runs and an algorithm was developed to optimize the fusion zone grain size and the tensile strength of pulsed current gas tungsten arc welded AA6061 aluminium alloy *** results indicate that the peak current (Ip) and base current (IB) are the most significant parameters,to decide the fusion zone grain size and the tensile strength of the AA6061 aluminum alloy joints.

关键词：脉冲电流钨电极惰性气体保护焊铝合金颗粒尺寸

A Review of Printable Flexible and Stretchable Tactile Sensors

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Research 2019年第1期2019卷 210-241页

作者： Kirthika senthil kumar Po-Yen Chen Hongliang Ren Department of Biomedical Engineering Medical Mechatronics LaboratoryNational University of SingaporeSingapore 117583 Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585

Flexible and stretchable tactile sensors that are printable,nonplanar,and dynamically morphing are emerging to enable proprioceptive interactions with the unstructured surrounding *** to its varied range of applications in the field of wearable electronics,soft robotics,human-machine interaction,and biomedical devices,it is required of these sensors to be flexible and stretchable conforming to the arbitrary surfaces of their stiff *** challenges in maintaining the fundamental features of these sensors,such as flexibility,sensitivity,repeatability,linearity,and durability,are tackled by the progress in the fabrication techniques and customization of the material *** review is aimed at summarizing the recent progress of rapid prototyping of sensors,printable material preparation,required printing properties,flexible and stretchable mechanisms,and promising applications and highlights challenges and opportunities in this research paradigm.

关键词： durability printing enable

Evaporative/radiative electrospun membrane for personal cooling

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Nano Research 2023年第2期16卷 2563-2571页

作者： Mohammad Irfan Iqbal Shuo Shi Gokula Manikandan senthil kumar Jinlian Hu Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Functional textiles that promote daily comfort and productivity must efficiently release body sweats and transmit radiative heat through sweat evaporation and mid-infrared radiation(MIR)(8–13μm).However,most of the traditional clothing cannot provide simultaneous sweat evaporation and mid-infrared radiation transmission efficiently,leading to a poor design of personal cooling ***,an evaporative/radiative integrated functional fibrous electrospun membrane is meticulously designed and controllably fabricated via facile electrospinning technology for personal cooling *** developed membrane can be applied as a smart wearable with distinct personal thermal management *** promising temperature and humidity responsive vapor transmission of the membrane grants 1.2 times of evaporative cooling than that of traditional ***,based on its high mid-infrared radiation transmission(53%)property in the range of 8–13μm,the as-spun membrane provides extra cooling of 1.5°C than that of ***,the building energy saving performances demonstrated that 47.1%annual building cooling can be achieved using the developed electrospun *** general,the evaporative/radiative electrospun membrane creates a passive cooling microclimate for the human body,meeting the growing demand of wearable for personal cooling.

关键词： building energy cooling management electrospinning evaporative cooling radiative cooling

In vitro and in vivo anticancer activity of Indigofera cassioides ***. DC.

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Asian Pacific Journal of Tropical Medicine 2011年第5期4卷 379-385页

作者： Raju senthil kumar Balasubramanian Rajkapoor Perumal Perumal Natural Products Laboratory Swamy Vivekanandha College of PharmacyTiruchengoduTamilnaduIndia Department of Pharmacology Dayanandha Sagar College of PharmacyBangaloreIndia Department of Pharmaceutical Chemistry JKK Nataraja College of PharmacyKomarapalayamTamilnaduIndia

Objective:To evaluate the antitumor,cytotoxic and antioxidant activities of methanolic leaf extract of Indigofera cassioides(MEIC) against transplantable tumors and human cancer cell ***:MEIC was investigated for its short term cytotoxicity on EAC and DLA cells by trypan blue dye exclusion method and in vitro cytotoxicity on HeLa,HEp-2,HEpG-2,MCF-7, HT-29,Vero and NIH 3T3 cells by MTT *** vivo antitumor activity was studied on EAC and DLA tumor bearing *** was assessed by monitoring the mean survival time,effect on hematological parameters,antioxidant enzyme levels and solid tumor ***:MEIC exhibit potent in vitro cytotoxicity against all the tested cancer cell lines,but it was found to be safe on normal *** extract significantly(P<0.001) increase the mean survival time and also have a protective effect on the hemopoietic system at the tested dose levels(200 and 400 mg/kg). The extract prevented lipid peroxidation and restored the antioxidant enzymes catalase, superoxide dismutase,glutathione peroxidase and glutathione-s-transferase in the liver of tumor control *** also significandy(P<0.01) reduce the solid tumor ***:The results strongly support that MEIC shows potent antitumor and cytotoxic effects against EAC,DLA and human cancer cell *** extract prevents lipid peroxidation and promotes the enzymatic antioxidant defense system in tumor bearing animals which might be due to activities like scavenging of free radicals by the phytochemicals in MEIC.

关键词： Indigofera cassioides Cytotoxicity Antitumor Antioxidant Mean survival time Hematological parameters Solid tumor volume