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In vitro Antioxidant Activity of Ethanolic Extract of Chlorophytum borivilianum
R. Govindarajan1,,N. Sreevidya1,,M. Vijayakumar1,,M. Thakur2,,V.K. Dixit2,,S. Mehrotra*1,,P. Pushpangadan1 한국생약학회 2005 Natural Product Sciences Vol.11 No.3
Chlorophytum borivilianum Baker (Antharicaceae) comonly referred as ‘Safed Musli’ has beenwidely used in the Indian traditional systems of medicine to treat various diseases like rheumatism apart fromaphordisiac properties. C. borivilianum was screened for the first time to determine its antioxidant activity,isolation of the sapogenins and standardization of the isolated sapogenin fraction using HPTLC. Potent antioxidantactivity of ethanolic extract was found by their ability to scavenge DPPH (84.51%), hydroxyl radical (48.95 %),feryl bi-pyridyl complex (84.53%) along with the inhibition of lipid peroxidation (67.17%) at 100g/mlconcentration. The ethanolic extract also exhibited significant inhibition of superoxide anion radical generated byplant in the traditional system especially its use as a Rasayana drug.
GLOBAL EXISTENCE FOR VOLTERRA-FREDHOLM TYPE FUNCTIONAL IMPULSIVE INTEGRODIFFERENTIAL EQUATIONS
V. VIJAYAKUMAR,K. ALAGIRI PRAKASH,R. MURUGESU 한국산업응용수학회 2013 Journal of the Korean Society for Industrial and A Vol.17 No.1
In this paper, we study the global existence of solutions for the initial value problems for Volterra-Fredholm type functional impulsive integrodifferential equations. Using the Leray-Schauder Alternative, we derive conditions under which a solution exists globally.
EXISTENCE OF SOLUTIONS FOR DOUBLE PERTURBED IMPULSIVE NEUTRAL FUNCTIONAL EVOLUTION EQUATIONS
V. VIJAYAKUMAR,S. SIVASANKARAN,M. MALLIKA ARJUNAN 한국산업응용수학회 2011 Journal of the Korean Society for Industrial and A Vol.15 No.4
In this paper, we study the existence of mild solutions for double perturbed impulsive neutral functional evolution equations with infinite delay in Banach spaces. The existence of mild solutions to such equations is obtained by using the theory of the Hausdorff measure of noncompactness and Darbo fixed point theorem, without the compactness assumption on associated evolution system. An example is provided to illustrate the theory.
V. Vijayakumar,Pradeep Johnson,Ruban Whenish,A. John Rajan,Vincent H Wilson 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
The characteristics of Al 6061/SiCp Metal Matrix Composite (MMC) have been established for checking the suitability oflightweight spur gear using Powder Metallurgy (P/M) technique. Aluminium powder reinforced with SiCp particle withvarious weight.% (0, 5, 10 & 15) and particle sizes (35 μm and 65 μm). The smaller sized spur gears of 4 mm module, 48 mmpitch circle diameter and 22 mm face width were chosen. The complex gear profiled compaction die assembly was manufacturedfor making net shaped gear without any machining operation. The H frame hydraulic press was used to compact gear sampleswith compaction pressures of 132 MPa and 165 MPa. Then gear samples were sintered using muffle furnace at 570 ºC. Theprepared gear samples were used for density measurement, bending strength test, hardness measurement and microstructureanalysis. The research work leads to the observation of Al 6061 with 10 wt.% & 35 μm size of (SiCp) P/M gear exhibiting agreater enhancement of mechanical properties than the unreinforced Al alloy. Thus the effect of adding ceramic particles SiCpwith Al 6061 enhanced the mechanical properties and enabling Al 6061/SiCp composite spur gear suitable for lightweightapplications.
R. Palanisamy,V. Shanmugasundaram,S. Vidyasagar,V. Kalyanasundaram,K. Vijayakumar 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
A Space Vector Pulse Width Modulation (SVPWM) control strategy is implemented for capacitor voltage balancing of Flying Capacitor (FC) based 4-level Neutral Point Clamped (NPC) inverter. This fl ying capacitor based 4-level NPC inverter is developed for medium voltage and high power applications. This system includes 6 power switching devices, 2 clamping diodes and 2 fl ying capacitors per leg. The fl ying capacitors ensure to operate inverter normally and all the switching devices share the voltage stresses in identical manner. Also it controls the voltage across each capacitor and maintained at V dc /3 times of applied dc voltage. The proposed SVPWM method takes advantage of utilizing redundancy switching states to control and balance the voltage across the capacitor using nearest switching state vector selection method. Moreover, this system provides reduced total harmonic distortion (THD), and minimized voltage stress. The control technique is implemented without using any look-up tables or eff ective logic tables or trigonometric functions. The simulation and experimental results of this proposed verifi ed are verifi ed using Matlab-simulink and FPGA controller respectively.
Diagnosis of Non-invasive Glucose Monitoring by Integrating IoT and Machine Learning
V. K. R. Rajeswari Satuluri,Vijayakumar Ponnusamy 대한전자공학회 2022 IEIE Transactions on Smart Processing & Computing Vol.11 No.6
Diabetes Mellitus (DM) is a term collectively used for all types of diabetes. DM increases the risk factor for health complications if not treated early. The Internet of Things (IoT) and artificial intelligence (AI) in healthcare have become a huge benefit for managing DM. The selfsupervision of healthcare has become convenient because of IoT-enabled devices. This paper reviews the management of diabetes, such as invasive, non-invasive, and minimally invasive methods. Justification for the need for non-invasive monitoring of glucose is discussed. Different AI and IoT-enabled management for non-invasive diabetes are also briefed. This review aims at the type of machine learning algorithms applied to non-invasive glucose monitoring. The following are to be considered to achieve an effective non-invasive method of monitoring glucose: Near Infrared spectroscopy (NIR) and Machine learning algorithms(ML). IoT in glucose monitoring has empowered doctors and caretakers to deliver outstanding care. Self-care by every person has become essential, which can be achieved by handheld or wearable IoT devices. Using current technologies, the possibility of making a wearable to monitor the glucose level is becoming closer to reality and has enormous potential.
CFD estimation of HDCs for varying bodies of revolution of underwater gliders
R.V. Shashank Shankar,R. Vijayakumar Techno-Press 2023 Ocean systems engineering Vol.13 No.3
Autonomous Underwater Gliders (AUGs) are a type of Underwater Vehicles that move without the help of a standard propeller. Gliders use buoyancy engines to vary their weight or buoyancy and traverse with the help of the Lift and Drag forces developed from the fuselage and the wings. The Lift and Drag Coefficients, also called Hydrodynamic coefficients (HDCs) play a major role in glider dynamics. This paper examines the effect of the different types of glider fuselages based on the bodies of revolution (BOR) of NACA sections. The HDCs of the glider fuselages are numerically estimated at a low-speed regime (10<sup>5</sup> Reynolds Number) using Computational Fluid Dynamics (CFD). The methodology is validated using published literature, and the results of CFD are discussed for possible application in the estimation of glider turning motion.
M.Vijayakumar,V.Karthikeyani 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.1
Energy Efficient in the VoIP transmission is the major criteria and issues to be maintained the packet and data while processing VoIP (QoS) over Manet environment. Mobile Adhoc network (MANETs) presents a good platform for the fast deployment of VoIP services in many application scenarios. The energy efficiency mechanism for the data packet of voice in the queuing system have not been concentrated which actually consumes the more power while in the queue buffer management. Manet provide a considerable complexity that makes the transmission of real-time applications like VoIP a great challenge due to insufficient energy for packet transmission. In this research a new algorithm is proposed which enhance the performance of energy in manet carrying VoIP traffic. Through a simulation and mathematical expression we analyze and evaluate QoS indicators such as Distance, power, Bandwidth. Several voice codec are studied to determine their effect of insufficient energy. In the existing methods queuing energy have been used depend on number of nodes in certain environment which is drawbacks with mobile nodes. Hence a QoS based Intelligent Adaptive Energy Efficiency & Effective signal buffer management algorithm for voip(QoS) over Manet. The main objective of this paper is to segregate the energy altitude as per detachment the bandwidth is assign by using our IAE3 signal barrier algorithm in manet environment. In great and dynamic networks, central algorithms are not suitable due to the lack of responsiveness. The bandwidth allocation is done by IAE3 signal buffer algorithm.
An Enhanced Perceptive Queuing Technique (CBCRTQ) for Traffic Management in VoIP Over MANET
M. Vijayakumar,V. Karthikeyani 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.5
Traffic management in the VOIP transmission is the most important criteria and issue (to be maintained the packet). The traffic maintains packets and data as a source of outcome for VoIP (QoS) over Manet background. Queuing is one of the most important mechanisms in traffic executive. Mobile Adhoc network (MANETs) present a good platform for the fast deployment of VoIP services in many application scenarios. Ad hoc networks consist a set of identical node that moves freely, independently and communicate with other node via wireless links, the main challenge in extreme sensitivity to delay and packet loss in Voip over Manet. In this research a new algorithm proposed which enhance the performance of traffic load in VOIP carryover MANET environment. Through a simulation and mathematical expression we analyze and evaluate QoS parameters, in the existing method there is no load balanced queuing mechanism and lack in cluster selection prototype. Hence researcher proposed a new Class Based Cluster Round Trip Queue (CBCRTQ) algorithm for VoIP (QoS) over MANET. The main objective of this algorithm selection of cluster heads form a virtual backbone and may be used to route packets for nodes in their cluster. There is a need of traffic load balance at Cluster Round Trip methodology in VoIP, Simulation experiment makes clear that the future algorithm does provide longer cluster head selection and duration with traffic load-balancing.