G Pulla Reddy Engineering College
G Pulla Reddy Engineering College
Reddy T.J.,G Pulla Reddy Engineering College |
Rao S.N.,G Pulla Reddy Engineering College
Proceedings of 2016 International Conference on Advanced Communication Control and Computing Technologies, ICACCCT 2016 | Year: 2016
Image fusion is defined as the process of merging related information from two or more images captured using different sensors to produce a composite image for better medical diagnosis. Fusion of Computed Tomography (CT) and Magnetic Resonance (MR) images is considered. In the proposed work, trade-off between the spectral distortion and enhancement of spatial information is observed while fusing two images. The major drawbacks of wavelet based fusion techniques are incomplete directionality, deficiency of phase information and shift invariant and these are addressed by using Non-Subsampled Contourlet Transform. The Non-Subsampled contourlet retains the structural information while decomposing and reconstructing the images. The performance is analyzed by computing Root Mean Square Error (RMSE) and Peak Signal to Noise Ratio (PSNR). © 2016 IEEE.
Vittal M.V.R.,G Pulla Reddy Engineering College
Defence Science Journal | Year: 2017
A modified alternative signal technique for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing systems employing offset quadrature amplitude modulation (OFDM-OQAM) is proposed. Lower PAPR reduces the complexity of digital to analog converters and results in increasing the efficiency of power amplifiers. The main objective of the algorithm is to decrease PAPR with low complexity. The alternative signal method involves the individual alternative signal (AS-I) and combined alternative signal (AS-C) algorithms. Both the algorithms decrease the peak to average power ratio of OFDM-OQAM signals and AS-C algorithm performs better in decreasing PAPR. However the complexity of AS-C algorithm is very high compared to that of AS-I. To achieve reduction in PAPR with low complexity, modified alternative signal technique with sequential optimisation (MAS-S) is proposed. The quantitative PAPR analysis and complexity analysis of the proposed algorithm are carried out. It is demonstrated that MAS-S algorithm simultaneously achieves PAPR reduction and low complexity. © 2017, DESIDOC.
Sandeep N.C.,G Pulla Reddy Engineering College |
Raghavendra Rao H.,G Pulla Reddy Engineering College |
Hemachandra Reddy K.,G Pulla Reddy Engineering College
Materials Today: Proceedings | Year: 2017
This paper presents the extraction of fiber from the bark of Aegle marmelos plant and also the effect of alkali treatment on physical, chemical composition and tensile properties of Aegle marmelos fiber. Aegle marmelos fiber were treated with NaOH solution at 5%, 10% and 15% concentrations. Both untreated and alkali treated fiber is characterized by studying their chemical composition and tensile properties. It is observed that untreated fiber have lower cellulose content and tensile properties. The optimum tensile strength, modulus and percentage elongation is observed for the fiber treated with 10% NaOH solution. Tensile properties and chemical compositions of Aegle marmelos fiber are compared with those of other natural fibers. It is observed that Aegle marmelos fiber can be used as reinforcement in composites. © 2017 Elsevier Ltd. All rights reserved.
Madhusudhan Reddy B.,G Pulla Reddy Engineering College |
Venkata Mohan Reddy Y.,G Pulla Reddy Engineering College |
Chandra Mohan Reddy B.,Jawaharlal Nehru University
Materials Today: Proceedings | Year: 2017
In recent days, use of fiber reinforced polymer composites is growing rapidly due to their better mechanical properties like tensile strength, flexural strength, and impact strength; and also due to their low cost and low density. In the present work, Burmese silk orchid fibers are used as reinforcement and epoxy as matrix material to fabricate the composite material. Using hand-layup technique, composite specimens were prepared by increasing the weight of the fibers as 5, 10, 15, and 20 grams. Test specimens are cut as per the ASTM standards. Tensile strength, flexural strengths are determined using Instran Universal Testing Machine and impact strength of the samples is measured using Izod impact testing machine. Experimental results are validated. © 2017 Elsevier Ltd. All rights reserved.
Kumar G.V.,G Pulla Reddy Engineering College |
Bindu C.S.,Jawaharlal Nehru Technological University Anantapur
International Journal of Communication Networks and Distributed Systems | Year: 2017
IEEE 802.11-based wireless mesh networks (WMNs) are emerging as the promising technology to provide wireless broadband internet access. In order to access the internet via a pre-deployed WMN, a user has to associate with one of the access points (APs) present in the network. Received signal strength (RSS)-based association method defined by the IEEE 802.11 standard does not consider the channel conditions and the AP load into association process. This paper proposes a novel method of AP selection which considers the channel conditions, AP load and wireless mesh backhaul conditions. As lower-rate user association drops down the performance of higher-rate users already associated with the same AP, our method tries to minimise this negative impact. The proposed AP selection method is scalable and also independent of routing protocol and routing metric used in WMN. Through the simulations, we show that our method performs better than RSS-based AP selection method in terms of improving system throughput in WMNs. © 2017 Inderscience Enterprises Ltd.
Vijaya Kumar G.,G Pulla Reddy Engineering College |
Shoba Bindu C.,Jawaharlal Nehru Technological University Anantapur
International Journal of Communication Networks and Information Security | Year: 2017
The IEEE 802.11 based wireless mesh networks (WMNs) are becoming the promising technology to provide lastmile broadband Internet access to the users. In order to access the Internet through the pre-deployed WMN, the user has to associate with one of the access points (APs) present in the network. In WMN, it is very common that the user device can have multiple APs in its vicinity. Since the user performance majorly depends on the associated AP, how to select the best AP is always remaining as a challenging research problem in WMN. The traditional method of AP selection is based on received signal strength (RSS) and it is proven inefficient in the literature as the method does not consider AP load, channel conditions, etc. This paper proposes a new method of user association in WMN such that the user selects the AP based on achievable end-to-end throughput measured in the presence of other interfering APs. The proposed association metric is independent of routing protocol and routing metric used in WMN. The simulation results show that our method outperforms the RSS based AP selection method in WMN.
Babu Y.R.,G Pulla Reddy Engineering College
Pramana - Journal of Physics | Year: 2017
Nickel-zinc ferrites with the general chemical formula, Ni0.3Zn0.7-xMgxFe2O4 with x varying from 0.00 to 0.25 in steps of 0.05, have been prepared by conventional solid-state method. Final sintering of the samples was carried out at 1200°C for 6 h in air to investigate their structural and magnetic properties. X-ray diffraction patterns of all the samples confirm the cubic spinel structure. Percent porosity and lattice constants of the samples are similar for all the samples except for the sample with x = 0.05 implying that the changes in magnetic properties could be solely attributed to the effects caused by substitutions only. The saturation magnetization has been observed to increase continuously with the substitution of Mg2+ ions in the place of Zn2+ ions. Curie temperature of the system was also found to increase from 261°C (x = 0.00) to 364°C (x = 0.25) with the increase in magnesium content. Smooth coercivity variation suggests better structural homogeneity. The results are discussed in the light of the distribution of the cations among octahedral and tetrahedral sites. © Indian Academy of Sciences.
Raju K.,G Pulla Reddy Engineering College |
Rao D.S.B.,G Pulla Reddy Engineering College
Proceedings of 2016 Online International Conference on Green Engineering and Technologies, IC-GET 2016 | Year: 2017
In this paper, a fully differential low voltage folded cascode CMOS low noise amplifier for zig-bee based applications in wireless sensor networks is presented. The noise figure can be reduced by various gain enhancement techniques of folded cascode LNA. By using capacitive cross coupling technique for LNA, enhancement in trans conductance and linearity of common gate topology can be achieved. The key issues of wireless sensor network are outlined and different LNA performance characteristics are analyzed. The proposed low noise figure and high linearity LNA is made using 0.18μm UMC MMRFCMOS technology with 0.6V supply voltage. This LNA exhibits the noise figure of 1.003 dB, power gain of 18.79 dB, input return loss (S11) of 13 db, reverse isolation (S12) of more than 30 dB and IIP3 of - 4.5 dBm. From a 0.6 V supply, 3 mW of power is consumed. © 2016 IEEE.
Reddy G.K.,G Pulla Reddy Engineering College
Proceedings of 2015 IEEE 9th International Conference on Intelligent Systems and Control, ISCO 2015 | Year: 2015
With increasing contribution of leakage in total active power, run-time leakage control techniques are becoming extremely important. The Pass-Transistor Logic (PTL) is a better way to implement circuits designed for low power applications. As the technology is growing pass transistor logic has gained the prominent importance. In this design of 1 bit ALU, PTL technology has been deliberately implemented. The Boolean equations have been modified in order to reduce the transistor count, and also reuse of hardware has also been achieved. © 2015 IEEE.
Urmila B.,G Pulla Reddy Engineering College |
Subba Rayudu D.,Brindavan Institute of Technology and science
Journal of Engineering and Applied Sciences | Year: 2011
A Three-Level Voltage Source Inverter is used increasingly to supply a variable frequency and variable voltage for variable speed applications. A suitable pulse width modulation technique is employed to obtain the required output voltage at the line side of the inverter. This paper studies popular multi-level topology, Diode Clamped or Neutral Point Clamped for three-level. Two methods of Sine-triangle and two methods of Space Vector Pulse Width Modulation are employed to generate the modulation wave. These modulation waves are compared against a triangular carrier to generate the PWM signals for the three phases. In SVPWM methods, a revolving reference voltage vector is provided as voltage reference instead of three phase modulating waves used in SPWM. The magnitude and frequency of the fundamental component in the line side are controlled by the magnitude and frequency, respectively, of the reference vector. Space Vector Modulation Technique has become the important PWM technique for three phase Voltage Source Inverters because of its increased dc bus utilization and reduced harmonic distortion compared to SPWM. The four PWM methods are simulated in MATLAB/SIMULINK software and are compared for THD and Capacitor Balance. Programs are carried out using Embedded Editor functions and Matlab editor functions. The simulation study reveals that Space vector PWM utilizes dc bus voltage more effectively, generates less THD and improved capacitor balance when compared to Sine PWM. © 2006-2011 Asian Research Publishing Network (ARPN).