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红外与毫米波学报 2015年第5期34卷 513-519页

作者： S Ramesh t rama rao Department of Electronics & communication Engineering Valliammai Engineering College RADMIC Department of Telecommunication EngineeringSRM University

A new and upcoming application is the use of 60 GHz antennas for high date rate point-to-point connections to serve Gigabit(Gi-Fi)w ireless *** design of M illimeter w ave(M m W)antennas has to cope w ith the unadorned influences of manufacturing tolerances and losses at 60 *** this paper,the concept of Substrate Integrated Waveguide(SIW)and Exponentially tapered Slot(EtS)antenna w ere used together to design a high gain,efficient planar dielectric loaded antenna for M m W Gi-Fi w ireless communications at 60 *** SIW is used to feed the antenna and a dielectric is utilized in front of the antenna to increase the *** dielectric loaded EtS antenna and compact SIW feed w ere fabricated on a single substrate,resulting in low cost and easy *** antenna w ith elliptical shaped dielectric loaded w as fabricated using printed circuit board *** measured gain of the single element antenna is 10.2 dB,w hile the radiation efficiency of 96.84%is obtained at 60 *** Y-junction SIW pow er divider is used to form a 1×4 array structure.M easured gain of the 1×4 array antenna is 13.3 dB,w hile the measured radiation pattern and gain are almost constant w ithin the w ide bandw idth of the antenna.

关键词： millimeter waves 60 GHz exponentially tapered slot antenna dielectric loading substrate integrated waveguide

FPGA Implementation of FFt Algorithm for OFDM Based IEEE 802.16d (Fixed WiMAX) Communications

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Journal of Electronic Science and technology 2010年第3期8卷 193-199页

作者： K.Harikrishna t.rama rao Vladimir A.Labay Narayana Engineering College SRM University Gonzaga University

the IEEE 802.16d communication standard uses orthogonal frequency division multiplexing （OFDM）. In the widely used OFDM systems, the fast Fourier transform （FFt） and inverse fast Fourier transform pairs are used to modulate and demodulate the data constellation on the sub-carriers. In this paper, a high level implementation of a high performance FFt for OFDM modulator and demodulator is presented. the design has been coded in Verilog and targeted into Xilinx Spartan3 field programmable gate arrays. Radix-22 algorithm is proposed and used for the OFDM communication system. the design of the FFt is implemented and applied to fixed WiMAX--IEEE 802.16d communi- cation standard. the results are tabulated and the hardware parameters are compared. the proposed architecture is least in number of multipliers used and the memory size, and second to the least in number of adders used.

关键词： Index terms-Fast Fourier transform orthogonal frequency division multiplexing radix conversion Verilog.

An Intelligent Big Data Security Framework Based on AEFS-KENN Algorithms for the Detection of Cyber-Attacks from Smart Grid Systems

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Big Data Mining and Analytics 2024年第2期7卷 399-418页

作者： Sankaramoorthy Muthubalaji Naresh Kumar Muniyaraj Sarvade Pedda Venkata Subba rao Kavitha thandapani Pasupuleti rama Mohan thangam Somasundaram Yousef Farhaoui Department of Electrical and Electronics Engineering CMR College of Engineering&TechnologyHyderabad 501401India Department of Electronics and Communication Engineering Vardhaman College of Engineering KacharamShamshabad 501218India Department of Electronics and Communication Engineering Sreenidhi Institute of Science and TechnologyHyderabad 501301India Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and TechnologyChennai 600062India Department of Electrical and Electronics Engineering Bharat Institute of Engineering and TechnologyHyderabad 501510India Department of Computer Science and Engineering Amrita School of ComputingAmrita Vishwa VidhyapeethamBengaluru 560035India t-IDMS Department of Computer ScienceFaculty of Sciences and TechniquesMoulay Ismail UniversityErrachidia 52000Morocco

Big data has the ability to open up innovative and ground-breaking prospects for the electrical grid,which also supports to obtain a variety of technological,social,and financial *** is an unprecedented amount of heterogeneous big data as a consequence of the growth of power grid technologies,along with data processing and advanced *** main obstacles in turning the heterogeneous large dataset into useful results are computational burden and information *** original contribution of this paper is to develop a new big data framework for detecting various intrusions from the smart grid systems with the use of AI ***,an AdaBelief Exponential Feature Selection(AEFS)technique is used to efficiently handle the input huge datasets from the smart grid for boosting ***,a Kernel based Extreme Neural Network(KENN)technique is used to anticipate security vulnerabilities more *** Polar Bear Optimization(PBO)algorithm is used to efficiently determine the parameters for the estimate of radial basis ***,several types of smart grid network datasets are employed during analysis in order to examine the outcomes and efficiency of the proposed AdaBelief Exponential Feature Selection-Kernel based Extreme Neural Network(AEFS-KENN)big data security *** results reveal that the accuracy of proposed AEFS-KENN is increased up to 99.5%with precision and AUC of 99%for all smart grid big datasets used in this study.

关键词： smart grid Machine Learning(ML) big data analytics AdaBelief Exponential Feature Selection(AEFS) Polar Bear Optimization(PBO) Kernel Extreme Neural Network(KENN)

Effect of organo-modified montmorillonite nanoclay on mechanical,thermal and ablation behavior of carbon fiber/phenolic resin composites

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Defence technology（防务技术） 2021年第3期17卷 812-820页

作者： Golla rama rao Ivautri Srikanth K.Laxma Reddy Advanced Systems Laboratory DRDOHyderabadIndia National Institute of technology WarangalIndia

the mechanical,thermal and ablation properties of carbon phenolic(C-Ph)composites(type-I)reinforced with different weight percentages of organo-modified montmorillonite(o-MMt)nanoclay have been studied *** milling was used to disperse different weight(wt)percentages(0,1,2,4,6 wt.%)of nanoclay into phenolic *** changes to resin due to nanoclay was *** the other hand,nanoclay added phenolic matrix composites(type-II)were prepared to study the dispersion of nanoclay in phenolic matrix by small angle X-ray scattering and thermal stability changes to the matrix by thermogravimetric analyser(tGA).this data was used to understand the mechanical,thermal and ablation properties of type-I *** laminar shear strength(ILSS),flexural strength and flexural modulus of type I composites increased by about 29%,12%and 7%respectively at2 wt.%addition of nanoclay beyond which these properties *** was attributed to reduced fiber volume fraction(%Vf)of type-I composites due to nanoclay addition at such high *** ablation rate of type-I composites was evaluated using oxy acetylene torch test at low heat flux(125 W/cm^(2))and high heat flux levels(500 W/cm^(2)).Mass ablation rates have increased at both flux levels marginally up to 2 wt.%addition of nanoclay beyond which it has increased *** is in contrast to increased thermal stability observed for type-I and type-II composites up to 2 wt.%addition of *** ablation rates due to nanoclay addition was attributed to higher insulation efficiency of nanolcay,which accumulates more heat energy in limited area behind the ablation front and self-propagating ablation mechanisms triggered by thermal decomposition of organic part of nanoclay.

关键词： Carbon/phenolic Nanoclay Mechanical properties thermal stability Ablation rate

A novel PV array configuration for enhancing maximum power from PV array

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Clean Energy 2022年第6期6卷 817-826页

作者： Dharani Kumar Narne t.A.Ramesh Kumar rama Koteswara rao Alla Department of Electrical Engineering Annamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Department of Electrical and Electronics Engineering RVR&JC College of EngineeringGunturAndhra Pradesh-522019India

Partial shading conditions(PSC)are unavoidable and are the main reason for the reduction in power from a photovoltaic(PV)*** proper arrangement,the impact of PSC can be somewhat *** are distinct types of configurations,including series,parallel,series-parallel(SP),honeycomb,total cross-tied(tCt),*** article presents a novel SP-tCt configuration to maximize output power from PV panels under different shading *** proposed configuration performance has been examined considering a 4×4 PV array under long-narrow and long-wide,short-narrow,short-wide and uniform shading *** results of the proposed configurations are compared with existing configurations in terms of performance measures such as maximum power,fill factor,efficiency and mismatch *** all the cases,performance of the proposed configuration is nearer to the tCt configuration *** percentage improvement in terms of efficiency for the proposed novel SP-tCt configuration and tCt configuration is nearly 1.6%compared to other methods.

关键词： maximum power shading patterns PV array efficiency

tumor microenvironment pathways:Cross regulation in breast cancer metastasis

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Genes & Diseases 2022年第2期9卷 310-324页

作者： rama rao Malla P.Kiran Cancer Biology Lab Department of Biochemistry and BioinformaticsInstitute of ScienceGITAM(Deemed to be University)Visakhapatnam 530045India

the tumor microenvironment(tME)is heterogeneous and contains a multiple cell population with surrounded immune cells,which plays a major role in regulating *** multifunctional pathways,Hedgehog(Hh),Wnt,Notch,and NF-kB,cross-regulates metas-tasis in breast *** review presents substantial evidence for cross-regulation of tME components and signaling pathways,which makes breast tME more heterogeneous and com-plex,promoting breast cancer progression and metastasis as a highly aggressive *** discoursed the importance of stromal and immune cells as well as their crosstalk in bridging the *** also discussed the role of Hh and Notch pathways in the intervention be-tween breast cancer cells and macrophages to support tME;Notch signaling in the bidirec-tional communication between cancer cells and components of tME;Wnt signal pathway in controlling the factors responsible for EMt and NF-kB pathway in the regulation of genes con-trolling the inflammatory *** also present the role of exosomes and their miRNAs in the cross-regulation of tME cells as well as pathways in the reprogramming of breast tME to support ***,we examined and discussed the targeted small molecule inhibitors and natural compounds targeting developmental pathways and proposed small molecule nat-ural compounds as potential therapeutics of tME based on the multitargeting *** conclu-sion,the understanding of the molecular basis of the cross-regulation of tME pathways and their inhibitors helps identify molecular targets for rational drug discovery to treat breast can-cers.

关键词： Breast cancer Cross-regulation Hedgehog NF-kB Notch tumor microenvironment Wnt

Modeling of a long sand-pack for heavy crude oil through depletion tests utilizing methane gas

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Petroleum 2021年第2期7卷 188-198页

作者： Bashir Busahmin rama rao Karri Stephen tyson Morteza Jami Petroleum&Chemical Engineering Universiti Teknologi BruneiBrunei Darussalam

With the enormous increase in the demand for crude oil,and decrease in the resources of conventional oil reservoirs,there is a great need to understand heavy or foamy oil-gas drive mechanism to maximize the oil and gas *** analyze the real movement of non-viscous heavy oil flow,the characteristic features of the oil-gas mixture has to be estimated to forecast the future potential supply from a heavy oil *** important question in heavy oil flow under solution gas drive is whether the behaviour of depletion tests can be simulated to model the heavy oil flow *** main objective of this research is to develop a reliable numerical model for modelling heavy oil flow calibrated with controlled solution gas drive experiments,and that makes a novelty in this *** this paper,CMG-StARS model which is capable of simulating solution gas drive tests that matched the research *** heavy oil recovery model can determine the relative permeability curves for oil and gas in the dualphase system using Corey’s *** a depletion rate of 0.0418 psi/min,the maximum cumulative oil and gas production was observed to be 13,000 cm^(3)and 8500 cm^(3),*** results from the bottom hole pressure and the block pressure simulation runs indicate that the fluid properties such as surface tension plays a significant role in the gas bubble *** results are promising,and helps to understand the complex behaviour of heavy oil reservoirs and thus can improve heavy oil recovery.

关键词： Depletion rate Simulation Gas fluid dual-phase Sand-pack Heavy oil reservoir Methane gas

A novel monocrystalline PV array configuration for enhancing the maximum power under partial shading conditions

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Clean Energy 2023年第4期7卷 783-794页

作者： Sarayu Vunnam M.Vanithasri rama Koteswara rao Alla Research Scholar Department of Electrical EngineeringAnnamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Assistant Professor Department of Electrical and Electronics EngineeringRVR&JC College of EngineeringGunturAndhra Pradesh-522019India Associate Professor Department of Electrical EngineeringAnnamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Associate Professor Department of Electrical and Electronics EngineeringRVR&JC College of EngineeringGunturAndhra Pradesh-522019India

Solar photovoltaic(PV)systems have gained importance as a promising renewable energy source in recent *** arrays are prone to variable irradiance levels under partial shading conditions due to non-uniform *** a result,there will be a decrease in the amount of power produced and hotspots will *** overcome these issues,it is essential to select an appropriate PV material and a suitable array *** obtain the maximum output power from a PV array under partial shading conditions,this paper suggests a novel triple-series–parallel ladder topology with monocrystalline PV *** short and wide,long and wide,short and narrow,long and narrow,middle and diagonal shading situations,a 6×6-sized array has been considered and compared with other existing configurations such as total cross-tied,bridge-link,honeycomb,series–parallel and series–parallel *** proposed configuration has an optimal number of cross ties to produce maximum *** has 4 cross ties fewer than a honeycomb,3 cross ties fewer than a bridge link,16 cross ties fewer than a total cross-tied and 7 cross ties fewer than series–parallel cross-tied *** proposed configuration has an improvement in power of 0.1%to 20%compared with other configurations under the considered shading scenarios.

关键词： monocrystalline PV material photo voltaic array series–parallel cross-tied,triple-series–parallel ladder topology

EtP-AKEP: enhanced three-party authenticated key exchange protocols for data integrity in cloud environments

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Journal of Control and Decision 2023年第1期10卷 126-133页

作者： Kalluri rama Krishna C.V.Guru rao Faculty of Informatics Osmania UniversityHyderabadIndia School of Computer Science&Artificial Intelligence S.R.UniversityWarangalIndia

With key exchange protocols, a secure session key is generated between two remote users, andservers and exchanged between them. It is generally used to prevent unauthorised users fromgaining access to sensitive data. this article presents an enhanced three-party authenticated keyexchange protocols (EtP-AKE) protocol that does not depend on symmetric key encryption andinstead uses asymmetric key encryption. A key component of the proposed EtP-AKE protocol isusing elliptic curve encryption in conjunction with a one-way hash function. Its integrity certificationwas confirmed via the usage of the AVISPA tool package. Our proposed protocol is intendedto protect against various security threats, including the man-in-the-middle assault, the parallelattack, and the key-compromise attack, among others.

关键词： ECC hash function cloud integrity third party key exchange

Implications for the lithospheric structure of Cambay rift zone,western India:Inferences from a magnetotelluric study

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Geoscience Frontiers 2020年第5期11卷 1743-1754页

作者： Nagarjuna Danda C.K.rao Amit Kumar P.rama rao P.B.V.Subba rao Dr.K.S.Krishnan Geomagnetic Research Laboratory IIGAllahabad221505India Indian Institute of Geomagnetism New PanvelNavi Mumbai410218India Department of Geophysics Andhra UniversityVisakhapatnam530003India

Broad-band and long-period magnetotelluric(Mt)data were acquired along an east-west trending traverse of nearly 200 km across the Kachchh,Cambay rift basins,and Aravalli-Delhi fold belt(ADFB),western *** regional strike analysis of Mt data indicated an approximate N59°E geoelectric strike direction under the traverse and it is in fair agreement with the predominant geological strike in the study *** decomposed transverse electric(tE)-and transverse magnetic(tM)-data modes were inverted using a nonlinear conjugate gradient algorithm to image the electrical lithospheric structure across the Cambay rift basin and its surrounding *** studies show a thick(~1-5 km)layer of conductive tertiary-Mesozoic sediments beneath the Kachchh and Cambay rift *** resistive blocks indicate presence of basic/ultrabasic volcanic intrusives,depleted mantle lithosphere,and different Precambrian structural *** crustal conductor delineated within the ADFB indicates the presence of fluids within the fault zones,sulfide mineralization within polyphase metamorphic rocks,and/or Aravalli-Delhi sediments/*** observed conductive anomalies beneath the Cambay rift basin indicate the presence of basaltic underplating,volatile(CO2,H2 O)enriched melts and channelization of melt fractions/fluids into crustal depths that occurred due to plume-lithosphere *** variations in electrical resistivity observed across the profile indicate that the impact of Reunion plume on lithospheric structures of the Cambay rift basin is more dominant at western continental margin of India(WCMI)and thus support the hypothesis proposed by Campbell&Griffiths about the plume-lithosphere interactions.

关键词： Cambay rift Deccan basalts Magnetotellurics Partial melt Reunion plume