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Improved delay-dependent robust H_∞ control of an uncertain stochastic system with interval time-varying and distributed delays

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Chinese Physics B 2014年第12期23卷 5-13页

作者： M.Syed Ali r.saravanakumar Department of Mathematics Thiruvalluvar University

In this paper, the robust H∞control problem for a class of stochastic systems with interval time-varying and distributed delays is discussed. The system under study involves parameter uncertainty, stochastic disturbance, interval time-varying,and distributed delay. The aim is to design a delay-dependent robust H∞control which ensures the robust asymptotic stability of the given system and to express it in the form of linear matrix inequalities（LMIs）. Numerical examples are given to demonstrate the effectiveness of the proposed method. The results are also compared with the existing results to show its conservativeness.

关键词： distributed delay interval time-varying delay H∞control linear matrix inequality(LMI) stochastic systems

Augmented Lyapunov approach to H_∞ state estimation of static neural networks with discrete and distributed time-varying delays

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Chinese Physics B 2015年第5期24卷 140-147页

作者： M.Syed Ali r.saravanakumar Department of Mathematics Thiruvalluvar University

This paper deals with H∞ state estimation problem of neural networks with discrete and distributed time-varying delays. A novel delay-dependent concept of H∞ state estimation is proposed to estimate the H∞ performance and global asymptotic stability of the concerned neural networks. By constructing the Lyapunov-Krasovskii functional and using the linear matrix inequality technique, sufficient conditions for delay-dependent H∞ performances are obtained, which can be easily solved by some standard numerical algorithms. Finally, numerical examples are given to illustrate the usefulness and effectiveness of the proposed theoretical results.

关键词： distributed delay H∞ state estimation neural networks stability analysis

robust H_∞ control of uncertain systems with two additive time-varying delays

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Chinese Physics B 2015年第9期24卷 25-34页

作者： M.Syed Ali r.saravanakumar Department of Mathematics Thiruvalluvar University

This paper is concerned with the problem of delay-dependent robust H∞control for a class of uncertain systems with two additive time-varying delays. A new suitable Lyapunov–Krasovskii functional（LKF） with triple integral terms is constructed and a tighter upper bound of the derivative of the LKF is derived. By applying a convex optimization technique, new delay-dependent robust H∞stability criteria are derived in terms of linear matrix inequalities（LMI）. Based on the stability criteria, a state feedback controller is designed such that the closed-loop system is asymptotically ***, numerical examples are given to illustrate the effectiveness of the proposed method. Comparison results show that our results are less conservative than the existing methods.

关键词： additive time-varying delays Lyapunov method H∞ control linear matrix inequality

Steadfast Energy Proficient Sensor Node Activation System in Wireless Networks Lifetime Enhancement

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Circuits and Systems 2016年第4期7卷 402-416页

作者： r. saravanakumar Dr. N. Mohankumar ECE/OAS Institute of Technology and Management Pulivalam Tiruchirappalli Tamilnadu India ECE/SKP Engineering College Thiruvannamalai Tamilnadu India

The wireless sensor network (WSN) is one of the budding exploring areas and fast rising fields in wireless communications. The sensor nodes in the network are generally small-size, low-cost, low-power and multi-function capabilities. Wireless sensor networks (WSNs) are used for various applications;since numerous sensor nodes are usually deployed on remote and inaccessible places, the employment and preservation should be easy and scalable. Sensor nodes in the field being run out of energy quickly has been an issue and many energy efficient routing protocols have been proposed to solve this problem and preserve the long life of the network. This paper work proposes a hierarchical based node activation routing technique which shows energy efficiency. This technique selects cluster head with highest residual energy in each communication round of transmission to the base station from the cluster heads. Hierarchical based node activation routing technique with different levels of hierarchy simulation results prolongs the lifetime of the network compared to other clustering schemes and communication rounds of simulation increase significantly.

关键词： Wireless Sensor Networks Hierarchical routing Energy Efficiency Clustering Node Activation Scheme Network Lifespan

Fuzzy Based Interleaved Step-up Converter for Electric Vehicle

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Intelligent Automation & Soft Computing 2023年第1期35卷 1103-1118页

作者： T.saravanakumar r.Saravana kumar School of Electrical Engineering Vellore Institute of TechnologyVellore632014India

This work focuses on the fuzzy controller for the proposed three-phase interleaved Step-up converter(ISC).The fuzzy controller for the proposed ISC converters for electric vehicles has been discussed in *** proposed ISC direct current(DC-DC)converter could also be used in automobiles,satellites,industries,and *** enhance voltage gain,the proposed ISC Converter combines boost converter and interleaved converter(IC).This design also reduces the number of *** a result,ISC converter switching losses are *** proposed ISC Converter topology can produce a 143 V output voltage and 1 kW of *** to the high voltage gain of this converter design,it is suitable for medium and high-power *** proposed ISC Converter topology is simulated in MATLAB/*** simulated output displays a high output *** the output voltage contains maximum *** proposes an ISC Converter which makes closed loop responsiveness and reduces the output voltage *** proposed ISC converter has the lowest ripple output voltage,which is less than 2%,because the duty cycle is regulated using the fuzzy logic *** offers high voltage gain,minimal ripple,and low switching *** performance of the proposed converter is compared to that of the fuzzy and Pro-portional Integral(PI)controllers implemented in MATLAB.

关键词： Step-up converter interleaved converter ripple voltage fuzzy electric vehicles

Hybrid Cloud Security by revocable KUNodes-Storage with Identity-Based Encryption

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Computer Systems Science & Engineering 2022年第12期43卷 985-996页

作者： S.saravanakumar S.Chitra Department of Information Technology Paavai Engineering CollegeNamakkal637018India Department of Computer Science and Engineering Er.Perumal Manimekalai College of EngineeringHosur63117India

Cloud storage is a service involving cloud service providers providingstorage space to customers. Cloud storage services have numerous advantages,including convenience, high computation, and capacity, thereby attracting usersto outsource data in the cloud. However, users outsource data directly via cloudstage services that are unsafe when outsourcing data is sensitive for users. Therefore, cipher text-policy attribute-based encryption is a promising cryptographicsolution in a cloud environment, and can be drawn up for access control by dataowners (DO) to define access policy. Unfortunately, an outsourced architectureapplied with attribute-based encryption introduces numerous challenges, including revocation. This issue is a threat to the data security of DO. Furthermore,highly secure and flexible cipher text-based attribute access control with role hierarchy user grouping in cloud storage is implemented by extending the KUNodes(revocation) storage identity-based encryption. result is evaluated using Cloudsim, and our algorithm outperforms in terms of computational cost by consuming32 MB for 150-MB files.

关键词： Cloud computing storage identification based revocation attribute based access control encryption decryption

Design of Precise Multiplier Using Inexact Compressor for Digital Signal Processing

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Computer Systems Science & Engineering 2022年第8期42卷 619-638页

作者： Nagarajan Shanmugam Vijeyakumar Krishnasamy Natarajan Kalaiselvi Sundaram saravanakumar Natarajan Electronics and Communication Engineering Dr.Mahalingam College of Engineering and TechnologyPollachi642003Tamil NaduIndia

In the recent years,error recovery circuits in optimized data path units are adopted with approximate computing *** this paper the novel multipliers have effective utilization in the newly proposed two different 4:2 approximate compressors that generate Error free Sum(ES)and Error free Carry(EC).Proposed ES and Proposed EC in 4:2 compressors are used for performing Partial Product(PP)*** structural arrangement utilizes Dadda structure based *** to the regularity of PP arrangement Dadda multiplier is chosen for compressor implementation that favors easy standard cell ASIC *** this,the proposed compression idealogy are more effective in the smallest n columns,and the accurate compressor in the remaining most significant *** limits the error in the multiplier output to be not more than 2n for an n X n *** choice among the proposed compressors is decided based on the significance of the sum and carry signals on the multiplier *** an enhancement to the proposed multiplier,we introduce two Area Efficient(AE)variants viz.,Proposed-AE(P-AE),and P-AE with Error recovery(P-AEEr).The proposed basic P-AE,and P-AEEr designs exhibit 46.7%,52.9%,and 52.7%PDP reduction respectively when compared to an approximate multiplier of minimal error type and are designed with 90nm ASIC *** proposed design and their performance validation are done by using Cadence *** performance evaluations are carried out using cadence encounter with 90nm ASIC *** proposed-basic P-AEA and P-AEEr designs demonstrate 46.7%,52.9%and 52.7%PDP reduction compared to the minimal error approximate *** proposed multiplier is implemented in digital image processing which revealed 0.9810 Structural SIMilarity Index(SSIM),to the least,and less than 3%deviation in ECG signal processing application.

关键词： Approximate computing precise multiplier PP compression area-efficient error-recovery approach

Graph-Based replication and Two Factor Authentication in Cloud Computing

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Computer Systems Science & Engineering 2023年第6期45卷 2869-2883页

作者： S.Lavanya N.M.saravanakumar Sri Krishna College of Engineering and Technology Coimbatore641008TamilnaduIndia M.Kumarasamy College of Engineering Karur639113Tamil NaduIndia

Many cutting-edge methods are now possible in real-time commercial settings and are growing in popularity on cloud *** incorporating new,cutting-edge technologies to a larger extent without using more infrastructures,the information technology platform is anticipating a completely new level of *** following concepts are proposed in this research paper:1)A reliable authentication method Data replication that is optimised;graph-based data encryp-tion and packing colouring in redundant Array of Independent Disks(rAID)*** the data centre,data is encrypted using crypto keys called Key *** keys are produced using the packing colouring method in the web graph’s jump *** order to achieve space efficiency,the replication is carried out on optimised many servers employing packing *** would be thought that more connections would provide better *** study provides an innovative architecture with robust security,enhanced authentication,and low cost.

关键词： Graph-based encryption replication encryption packing coloring jump graph web graph stream cipher key stream

An Efficient On-Demand Virtual Machine Migration in Cloud Using Common Deployment Model

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Computer Systems Science & Engineering 2022年第7期42卷 245-256页

作者： C.saravanakumar r.Priscilla B.Prabha A.Kavitha M.Prakash C.Arun Department of Information Technology St.Joseph’s Institute of TechnologyChennai600119India Department of Information Technology Loyola-ICAM College of Engineering and TechnologyChennai600034India Department of Electronics and Communication Engineering M.Kumarasamy College of EngineeringKarur639113India Data Science and Analytics Center Karpagam College of EngineeringCoimbatore641032India Department of Electronics and Communication Engineering R.M.K College of Engineering and TechnologyChennai601206India

Cloud Computing provides various services to the customer in aﬂex-ible and reliable *** Machines(VM)are created from physical resources of the data center for handling huge number of requests as a *** tasks are executed in the VM at the data center which needs excess hosts for satis-fying the customer *** VM migration solves this problem by migrating the VM from one host to another host and makes the resources available at any *** process is carried out based on various algorithms which follow a pre-deﬁned capacity of source VM leads to the capacity issue at the destination *** proposed VM migration technique performs the migration process based on the request of the requesting host *** technique can perform in three ways namely single VM migration,Multiple VM migration and Cluster VM *** Deployment Manager(CDM)is used to support through negotiation that happens across the source host and destination host for providing the high quality service to their *** VM migration requests are handled with an exposure of the source host *** proposed analysis also uses the retired instructions with execution by the hypervisor to achieve high *** objective of the proposed technique is to perform a VM migration process based on the prior knowledge of the resource availability in the target VM.

关键词： Cloud computing virtualization hypervisor VMmigration virtual machine