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Journal of Control and Decision 2023年第4期10卷 538-546页

作者： k.Ramkumar k.ravikumar E.M.Elsayed Department of Mathematics with CA PSG College of Arts&ScienceCoimbatoreIndia Department of Mathematics PSG College of Arts&ScienceCoimbatoreIndia Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia Department of Mathematics Faculty of ScienceMansoura UniversityMansouraEgypt

In this work,the optimal control for a class of Hilfer fractional stochastic integrodifferential systems driven by Rosenblatt process and Poisson jumps has been discussed in infinite dimensional space involving the Hilfer fractional ***,we study the existence and uniqueness of mild solution results are proved by the virtue of fractional calculus,successive approximation method and stochastic analysis ***,the optimal control of the proposed problem is presented by using Balder’s ***,an example is demonstrated to illustrate the obtained theoretical results.

关键词： Hilfer fractional derivative stochastic integrodifferential systems Rosenblatt process Poisson jumps successive approximation optimal control

Performance and Emission Characteristics of a CRDI Diesel Engine Fuelled by SiO_(2) Nanoparticle-Waste Fat Biodiesel Blends

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 56-66页

作者： Babu Aurtherson P Dinesh Babu Munuswamy ravikumar Jayabal Yuvarajan Devarajan Department of Mechanical Engineering Mahat Amma Institute of Engineering and TechnologyPudukkottaiTamil NaduIndia Department of Mechanical Engineering Rajalakshmi Institute of TechnologyChennaiTamil NaduIndia Department of Thermal Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennaiTamil NaduIndia

This study investigates the use of waste fat biodiesel(WFB)from the leather industry as a substitute for diesel ***,it examines the diesel engine performance of WFB,a blend of WFB and diesel(B50),and different blends of WFB and silicon dioxide(SiO_(2))nanoparticles(B50SiO_(2)40,B50SiO_(2)80,and B50SiO_(2)120μg/g).The results indicate that the B50SiO_(2)120 blend increases brake thermal efficiency by 10.03%compared to pure biodiesel but falls 1.93%short of neat ***,the B50SiO_(2)120 mixture reduces smoke,hydrocarbon,and carbon monoxide emissions by 31.87%,34.14%,and 43.97%respectively,compared to ***,the B50SiO_(2)120 blend shows a 4.91%increase in nitrogen oxide emissions compared to diesel.

关键词： waste fat transesterification biodiesel silicon dioxide emission

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基于非天然氨基酸的蛋白质合成研究进展

食品与发酵工业 2024年第12期50卷 336-342页

作者：赵梅刘馨远陈洋商洁丛宏日马豪 ravikumar Yuvaraj 齐向辉江苏大学食品与生物工程学院江苏镇江212013

蛋白质是生命体的重要组成部分,几乎参与了所有的生命活动。通常情况下生物体中蛋白质由20种天然氨基酸组成,但随着现代科技的飞速发展,人们对医疗、食品、材料等方面的需求日渐增大,这些蛋白质已经无法满足多样化的应用需求。随着非天... 详细信息

蛋白质是生命体的重要组成部分,几乎参与了所有的生命活动。通常情况下生物体中蛋白质由20种天然氨基酸组成,但随着现代科技的飞速发展,人们对医疗、食品、材料等方面的需求日渐增大,这些蛋白质已经无法满足多样化的应用需求。随着非天然氨基酸及其合成的蛋白质的优异性能,使得利用非天然氨基酸改造蛋白质的技术逐渐成为研究热点。非天然氨基酸有着不同于天然氨基酸的侧链基团,可以给蛋白质带来新的性质与功能。该文基于对非天然氨基酸及非天然蛋白质的研究,首先介绍了以化学及生物的手段合成非天然氨基酸的方法,同时对化学及生物法的优劣势及未来的发展前景进行了总结;然后介绍了将非天然氨基酸掺入蛋白质的几种热门方法;接着对非天然氨基酸及其合成蛋白质的应用在酶的改造、科研以及医疗方面进行了列举和描述;最后对这项技术未来的发展进行了展望与总结。

关键词：非天然氨基酸非天然蛋白质细胞代谢工程遗传密码扩展酶的改造蛋白药物改造

Management of multiple and displaced mandibular fractures in a pediatric patient sans mandibular immobilization,sans open reduction and internal fixation

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Chinese Journal of Traumatology 2024年第5期27卷 284-287页

作者： Elavenil Panneerselvam Chandini ravikumar Trishala Annamalai Rajan Sasikala Balasubramanian krishnakumar Raja V.B. Department of Oral and Maxillofacial Surgery SRM Dental College and HospitalRamapuramChennai600089Tamil NaduIndia

Maxillofacial fractures in the pediatric population are generally managed by conservative approaches such as soft diet and medication or semi-invasive procedures namely inter-maxillary fixation or circummandibular *** approaches are preferred over any invasive treatment to minimize injury to the growing skeleton and tooth *** fractures that cause functional problems such as restricted mouth opening,malocclusion or impaired breathing,mandate open reduction and internal ***,surgical management is associated with morbidity related to general anesthesia,risk of injury to vital structures,and potential,skeletal or dental growth *** case report describes a non-invasive method of managing displaced,multiple fractures of the mandible in a pediatric patient,with the use of low intensity pulsed ultrasound to achieve favorable clinical outcomes and nil *** immobilization of the mandible with inter-maxillary fixation nor open reduction and internal fixation was *** intensity pulsed ultrasound therapy is painless and patient-friendly.

关键词： Pediatric fractures Parasymphysis Ramus Composite splinting

Effect of Thickness of SnO_2:F over Layer on Certain Physical Properties of ZnO:Al Thin Films for Opto-electronic Applications

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Journal of Materials Science & Technology 2012年第11期28卷 999-1003页

作者： P. ravikumar k. Ravichandran B. Sakthivel P.G and Research Department of Physics AVVM Sri Pushpam College (Autonomous)

Bilayered FTO/AZO （fluorine doped tin oxide/aluminium doped zinc oxide） films were fabricated using a simple, cost effective spray pyrolysis technique. X-ray diffraction （XRD） profiles of bilayered films showed that in the case of lower thickness FTO over layers, （002） plane of ZnO phase had the highest intensity, whereas the predominance was changed in favour of （200） plane of SnO2 phase for higher thickness FTO over layer. UV studies showed that bilayered FTO/AZO films exhibited a sharp absorption edge as that of AZO film. The decrease in the photoluminescence （PL） peak at 420 nm with increasing FTO over layer thickness indicated a reduction in the zinc vacancies which caused a reduction in the sheet resistance （Rsh）. Electrical studies revealed that, eventhough the Rsh value （916Ω/□） of bilayered FTO （313 nm）/AZO （314 nm） film was found to be higher than that of FTO single layer film （72Ω/□）, it was much lower than that of AZO single layer film （5661Ω/□））. The atomic force microscopy （AFM） images reflect the characteristic features of both zinc oxide and tin oxide films.

关键词： ZnO thin films Sn02 Semiconductor materials Optical properties Electricalproperties Atomic force microscopy (AFM)

Geochemistry of groundwater, Markandeya River Basin, Belgaum district, karnataka State, India

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Chinese Journal Of Geochemistry 2011年第1期30卷 51-74页

作者： ravikumar P. Somashekar R.k. Department of Environmental Science Bangalore University Bangalore-560 056India

The Markandeya River Basin stretches geographically from 15o56′ to 16o08′ N latitude and 74o37′ to 74o58′ E longitude, positioned in the midst of Belgaum district, in the northern part of karnataka. The groundwater quality of 54 pre-monsoon samples in the Markandeya River Basin was evaluated for its suitability for drinking and irrigation purposes by estimating pH, EC, TDS, hardness and alkalinity besides major cations (Na+, k+, Ca2+, Mg2+) and anions (HCO3–, Cl–, SO42–, PO43-, F-, NO3–), boron, SAR, % Na, RSC, RSBC, chlorinity index, SSP, non-carbonate hardness, Potential Salinity, Permeability Index, kelley’s ratio, Magnesium hazard and Index of Base Exchange. Negative Index of Base Exchange indicates the chloro-alkaline disequilibrium in the study area and the majority of water samples fall in the rock dominance field based on Gibbs’ ratio. Permeability indices of classes I and II suggest suitability of groundwater for irrigation. Based on Cl, SO4, HCO3 concentrations, water samples can be classified as normal chloride (96.3%) and normal sulfate (94.4%) and normal bicarbonate (44.4%) water types.

关键词：水地球化学流域贝尔纳塔地下水水质碳酸盐硬度印度碳酸氢钠

Computational Analysis of Performance for Heterogeneous Integrated System with Test Automation

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International Journal of Automation and computing 2007年第4期4卷 353-358页

作者： k.krishna Mohan A.Srividya ravikumar Gedela Reliability Engineering Group Department of Electrical EngineeringIndian Institute of TechnologyMumbai 400076India Satyam Computer Services Limited Secunderabad 500003India

Heterogeneity is inevitable in enterprises due to their various input requirements. The usage of proprietary integration products results in the increased cost of enterprises. During the integration, the focus area has been found to often address only the functional requirements, while the non-functional requirements are side-stepped during the initial stages of a project. Moreover, the use of proprietary integration products and non-standards-based integration platform has given rise to an inflexible integration infrastructure resulting in adaptability concerns. Web services-based integration, based on open standards, is deemed to be the only feasible solution in such cases. This paper explains the performance analysis of enterprise integration in heterogeneous environments for the distributed and the transactional applications. The analysis presented in this paper is seen as a step towards making intelligent decisions well in advance when choosing the integration mechanism/products to address the functional as well as the non-functional requirements considering the future integration needs.

关键词： Enterprise application integration reliability performance web services point-to-point IBM/rational platform service oriented architecture.

Attenuate Class Imbalance Problem for Pneumonia Diagnosis Using Ensemble Parallel Stacked Pre-Trained Models

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计算机、材料和连续体（英文） 2023年第4期75卷 891-909页

作者： Aswathy ravikumar Harini Sriraman School of Computer Science and Engineering Vellore Institute of TechnologyChennai600127India

Pneumonia is an acute lung infection that has caused many fatalitiesglobally. Radiologists often employ chest X-rays to identify pneumoniasince they are presently the most effective imaging method for this ***-aided diagnosis of pneumonia using deep learning techniques iswidely used due to its effectiveness and performance. In the proposed method,the Synthetic Minority Oversampling Technique (SMOTE) approach is usedto eliminate the class imbalance in the X-ray dataset. To compensate forthe paucity of accessible data, pre-trained transfer learning is used, and anensemble Convolutional Neural Network (CNN) model is developed. Theensemble model consists of all possible combinations of the MobileNetv2,Visual Geometry Group (VGG16), and DenseNet169 models. MobileNetV2and DenseNet169 performed well in the Single classifier model, with anaccuracy of 94%, while the ensemble model (MobileNetV2+DenseNet169)achieved an accuracy of 96.9%. Using the data synchronous parallel modelin Distributed Tensorflow, the training process accelerated performance by98.6% and outperformed other conventional approaches.

关键词： Pneumonia prediction distributed deep learning data parallel model ensemble deep learning class imbalance skewed data

A Machine Learning Approach for MRI Brain Tumor Classification

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Computers, Materials & Continua 2017年第2期53卷 91-108页

作者： ravikumar Gurusamy Vijayan Subramaniam Assistant Professor/ECE Vivekanandha Institute of Engineering and Technology for Women ElayampalamTiruchengodeNamakkal(Dt)-637205 Principal Surya Engineering CollegeMettukkadaiErode-638107.

A new method for the denoising,extraction and tumor detection on MRI images is presented in this *** images help physicians study and diagnose diseases or tumors present in the *** work is focused towards helping the radiologist and physician to have a second opinion on the *** ambiguity of Magnetic Resonance(MR)image features is solved in a simpler *** MRI image acquired from the machine is subjected to analysis in the *** real-time data is used for the *** preprocessing is performed using various filters for noise *** de-noised image is segmented,and the feature extractions are *** are extracted using the wavelet *** compared to other methods,the wavelet transform is more suitable for MRI image feature *** features are given to the classifier which uses binary tree support vectors for *** classification process is compared with conventional methods.

关键词： MRI image brain pathology k-Means algorithm Feature extraction Wavelet transform SVM Neural network k nearest algorithm.

Review of the crushing response of collapsible tubular structures

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Frontiers of Mechanical Engineering 2020年第3期15卷 438-474页

作者： Vivek PATEL Gaurav TIWARI ravikumar DUMPALA Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India

Studies on determining and analyzing the crushing response of tubular structures are of significant interest,primarily due to their relation to *** aspects of tubular structures,such as geometry,material,configuration,and hybrid structure,have been used as criteria for *** this review,a comprehensive analysis of the important findings of extensive research on understanding the crushing response of thin-walled tubular structures is *** in thin-walled structures,including multi-cell tube,honeycomb and foam-filled,multi wall,and functionally graded thickness tubes,are also discussed,focusing on their energy absorption *** extensive review of experimentation and numerical analysis used to extract the deformation behavior of materials,such as aluminum and steel,against static and dynamic loadings are also *** tube shapes,such as tubes of uniform and nonuniform(tapered)cross sections of circular,square,and rectangular shapes,have been used in different studies to identify their *** from geometric and loading parameters,the effects of fabrication process,heat treatment,and triggering mechanism on initiating plastic deformation,such as cutouts and grooves,on the surface of tubular structures are discussed.

关键词： monolithic structure crashworthiness energy absorber static and dynamic loadings multicellular tube structure filled tube