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Anthony Vinay Kumar S.,PESIT Bangalore South Campus | Arya A.,PESIT Bangalore South Campus
Proceedings of 2016 11th International Conference on Computer Engineering and Systems, ICCES 2016 | Year: 2016

Sorting is applied in daily life from ordering simple lists to real world applications. Sorting presents the data in an ordered fashion which helps in analysis or allows computing data faster. Radix sort is a non-comparative integer sorting algorithm that sorts in a linear time complexity. Radix sort performs modulus operation on each data to extract the digits at a specific position and maintain count table, based on this table it sorts the data. It is observed that computing at a bit level is faster than performing arithmetic operation to the values. It is essential to optimize the computation time of this sorting algorithm as it has a linear time complexity. This paper aims to optimize radix sort by performing bitwise operations in contrast to the normal integer division. © 2016 IEEE.

Khasim S.,University of Tabuk | Pasha A.,PESIT Bangalore South Campus | Pasha A.,Gousia College | Roy A.S.,Addis Ababa Institute of Technology | And 3 more authors.
Journal of Electronic Materials | Year: 2017

Poly(3,4-ethylene dioxythiophene):poly(styrenesulphonate) (PEDOT–PSS) in the recent past has emerged as one of the most fascinating conducting polymers for many device applications. The unique feature of PEDOT–PSS is its transparency in the entire visible spectrum with excellent thermal stability. The PEDOT–PSS as prepared as an aqueous dispersion has very low conductivity, and it hinders the performance of a device. In this work we report the conductivity enhancement of PEDOT–PSS thin films through secondary doping using a polar organic solvent such as sorbitol. The mechanism of conductivity enhancement was studied through various physical and chemical characterizations. The effect of sorbitol concentration on structure and transport properties of PEDOT–PSS thin films was investigated in detail. The structural and morphological modifications in PEDOT–PSS due to the addition of sorbitol was studied through Fourier transform spectroscopy, Ultra Violet–visible spectroscopy, theromogravimetric analysis, scanning electron microscopy and atomic force microscopy. The interactions resulting from conformational changes of PEDOT chains that changes from coiled to linear structure due to the sorbitol treatment significantly improves the conductivity of PEDOT–PSS films. The secondary doping of sorbitol reduces the energy barrier that facilitates the charge carrier hopping leading to enhanced conductivity. We have observed that the conductivity of PEDOT–PSS thin films was increased by two fold due to sorbitol treatment when compared to conductivity of pure PEDOT–PSS. We have carried out detailed analysis of dielectric parameters of sorbitol-treated PEDOT–PSS films and found that sorbitol treatment has a significant effect on various dielectric attributes of PEDOT–PSS films. Hence, secondary doping using sorbitol could be a useful way to effectively tailor the conductivity and dielectric properties of PEDOT–PSS thin films that can be used as flexible electrodes in optoelectronic devices. © 2017 The Minerals, Metals & Materials Society

Begum A.,PESIT Bangalore South Campus
International Journal of ChemTech Research | Year: 2014

A polynomial equation is developed to relate the concentration of hydrochloric acid as corrosive medium for mild steel to the variables like inhibitor concentration, temperature and time. The inhibitor used is castor seed oil. The effect of variables has been investigated and these are optimized using 3 level full factorial design method. The model allows the prediction of the extent of corrosion inhibition at different conditions. ANOVA is used to evaluate the validity of model. The correlation coefficient between the calculated and the experimental data indicates good performance of the model. From ANOVA, the variables and their interaction effect on the corrosion rate were significant. A maximum of 84.1% of Inhibition efficiency was achieved under the optimum conditions of 50%v/v inhibitors concentration, 48 hours time and at 303K temperature.

Nagesa Sastry D.,Vijayanagara Sri Krishnadevaraya University | Revanasiddappa M.,PESIT Bangalore South Campus | Basavaraja C.,Inje University | Suresh T.,Vijayanagara Sri Krishnadevaraya University | Raghavendra S.C.,Higher Colleges of Technology
Indian Journal of Engineering and Materials Sciences | Year: 2013

Camphor sulfonic acid (CSA) doped polyaniline (PANI) and tungsten oxide (WO3) composites (PANI/CSA/WO3) have been prepared by in situ deposition technique by placing different wt% of fine grade nano powder of WO3(PANI/CSA/WO3-10,-20,-30,-40 and-50%) during polymerization of polyaniline. The polymerization of aniline is carried by using ammonium peroxydisulfate as oxidizing agent. The composites are characterized by various physical methods such as Fourier transform infrared spectra (FTIR), X-ray diffractogram (XRD), thermo-gravimetric analysis (TGA), scanning electron micrograph (SEM) and transmission electron micrographs (TEM). The FTIR spectral data shows the homogeneous distribution of WO3 nano particles in PANI/CSA polymer matrix. The TGA reveals that PANI interacted strongly with the WO3-SO3H, enhancing the thermal stability of polyaniline. The SEM images indicate that increase of WO3 wt% in PANI/CSA/WO3 composites, enhances the compactness of the matrix. The TEM image clearly shows the size distribution of WO3 nanoparticles formed during the reaction and ranges from 150 to 200 nm. The temperature dependent DC conductivity of PANI/CSA/WO3 composites is studied in the temperature range 308-433 K. The results of PANI/CSA/WO3 indicate strong interaction of PANI/CSA with WO3 in the composites. The study of DC conductivity shows an evidence for the transport properties of the composites. Due to the positive temperature coefficient of resistance of WO3, these composites can signify in development of new materials in temperature dependent applications.

Prasanna B.P.,Tumkur University | Prasanna B.P.,Bangalore University | Avadhani D.N.,Rashtreeya Vidyalaya College of Engineering | Muralidhara H.B.,Bangalore University | And 4 more authors.
Bulletin of Materials Science | Year: 2016

Polyaniline/zirconium oxide (PANI/ZrO2) nanocomposites have been synthesized by incorporating ZrO2 nanoparticles into the PANI matrix via liquid-liquid interfacial polymerization method. The composite formation and structural changes in PANI/ZrO2 nanocomposites were investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). PXRD pattern of PANI/ZrO2 nanocomposites exhibited sharp and well-defined peaks of monoclinic phase of ZrO2 in PANI matrix. SEM images of the composites showed that ZrO2 nanoparticles were dispersed in the PANI matrix. The FT-IR analysis revealed that there was strong interaction between PANI and ZrO2. AC conductivity and dielectric properties of the nanocomposites were studied in the frequency range, 50-106 Hz. AC conductivity of the nanocomposites obeyed the power law indicating the universal behaviour of disordered media. The nanocomposites showed high dielectric constant in the order of 104, which could be related to dielectric relaxation phenomenon. Further, the materials were checked for their supercapacitance performance by using cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS). Among the synthesized nanocomposites, PANI/ZrO2-25 wt.% showed a higher specific capacitance of 341 F g-1 at 2 m Vs-1 and good cyclic stability with capacitance retention of about 88% even after 500 charge-discharge cycles. © Indian Academy of Sciences.

Sarasvathi V.,PESIT Bangalore South Campus | Iyengar N.C.S.N.,Vellore Institute of Technology | Saha S.,PESIT Bangalore South Campus
International Journal of Communication Networks and Information Security | Year: 2014

In recent years, multi-channel multi-radio wireless mesh networks are considered a reliable and cost effective way for internet access in wide area. A major research challenge in this network is, selecting a least interference channel from the available channels, efficiently assigning a radio to the selected channel, and routing packets through the least interference path. Many algorithms and methods have been developed for channel assignment to maximize the network throughput using orthogonal channels. Recent research and test-bed experiments have proved that POC (Partially Overlapped Channels) based channel assignment allows significantly more flexibility in wireless spectrum sharing. In this paper, first we represent the channel assignment as a graph edge coloring problem using POC. The signal-to-noise plus interference ratio is measured to avoid interference from neighbouring transmissions, when a channel is assigned to the link. Second we propose a new routing metric called signal-to-noise plus interference ratio (SINR) value which measures interference in each link and routing algorithm works based on the interference information. The simulation results show that the channel assignment and interference aware routing algorithm, proposed in this paper, improves the network throughput and performance.

Vanitha K.,Bharathiar University | Vijayalakshmi K.A.,Sri Vasavi College | Revanasiddappa M.,PESIT Bangalore South Campus
Materials Technology | Year: 2016

In-situ polymerisation of aniline was carried out in the presence of Sintered Fly Ash to synthesise polyaniline-SFA-Ag (IPANI-SFA-Ag) nanocomposite by chemical oxidation method with various compositions (5, 10, 15, 20 and 25 wt %) of fly ash in polyaniline. The synthesised composite film was surface modified by DC glow discharge plasma to improve the surface properties of IPANISFA-Ag nanocomposite. The prepared composite films were characterised by FTIR, XRD, SEM, UV and DC conductivity analysis. From FTIR analysis, some new bonds, like C=O, C-H., were observed in the plasma-treated samples. An XRD analysis report shows that the Ag nanoparticles were in good agreement with IPANI and the intensity of the composite has increased after plasma treatment. The calculated average grain size of the composite was 38 nm; also the specific surface area of both samples was (SSA) 26 m2 g-1. © 2016 Informa UK Limited, trading as Taylor & Francis Group

Nagaraja B.B.,PESIT Bangalore South Campus | Nagananda K.G.,Bangalore University
2015 IEEE Global Communications Conference, GLOBECOM 2015 | Year: 2015

A heterogenous network is considered where the base stations (BSs), small base stations (SBSs) and users are distributed according to independent Poisson point processes (PPPs). We let the SBS nodes to posses high storage capacity and are assumed to form a distributed caching network. Popular data files are stored in the local cache of SBS, so that users can download the desired files from one of the SBS in the vicinity subject to availability. The offloading-loss is captured via a cost function that depends on a random caching strategy proposed in this paper. The cost function depends on the popularity profile, which is, in general, unknown. In this work, the popularity profile is estimated at the BS using the available instantaneous demands from the users in a time interval [0,τ]. This is then used to find an estimate of the cost function from which the optimal random caching strategy is devised. The main results of this work are the following: First it is shown that the waiting time τ to achieve an ε > 0 difference between the achieved and optimal costs is finite, provided the user density is greater than a predefined threshold. In this case, τ is shown to scale as N^2, where N is the support of the popularity profile. Secondly, a transfer learning based approach is proposed to obtain an estimate of the popularity profile used to compute the empirical cost function. A condition is derived under which the proposed transfer learning-based approach performs better than the random caching strategy. © 2015 IEEE.

Sarasvathi V.,PESIT Bangalore South Campus | Saha S.,PESIT Bangalore South Campus | Iyengar N.C.S.N.,Vellore Institute of Technology | Koti M.,PESIT Bangalore South Campus
International Journal of Communication Networks and Information Security | Year: 2015

In Multi-Radio Multi-Channel (MRMC) Wireless Mesh Networks (WMN), Partially Overlapped Channels (POC) has been used to increase the parallel transmission. But adjacent channel interference is very severe in MRMC environment; it decreases the network throughput very badly. In this paper, we propose a Coefficient of Restitution based Cross layer Interference aware Routing protocol (CoRCiaR) to improve TCP performance in Wireless Mesh Networks. This approach comprises of two-steps: Initially, the interference detection algorithm is developed at MAC layer by enhancing the RTS/CTS method. Based on the channel interference, congestion is identified by Round Trip Time (RTT) measurements, and subsequently the route discovery module selects the alternative path to send the data packet. The packets are transmitted to the congestion free path seamlessly by the source. The performance of the proposed CoRCiaR protocol is measured by Coefficient of Restitution (COR) parameter. The impact of the rerouting is experienced on the network throughput performance. The simulation results show that the proposed cross layer interference aware dynamic routing enhances the TCP performance on WMN.

Sarasvathi V.,PESIT Bangalore South Campus | Iyengar N.C.S.N.,Vellore Institute of Technology | Saha S.,PESIT Bangalore South Campus
Cybernetics and Information Technologies | Year: 2015

In Multi-Channel Multi-Radio Wireless Mesh Networks (MCMR-WMN), finding the optimal routing by satisfying the Quality of Service (QoS) constraints is an ambitious task. Multiple paths are available from the source node to the gateway for reliability, and sometimes it is necessary to deal with failures of the link in WMN. A major challenge in a MCMR-WMN is finding the routing with QoS satisfied and an interference free path from the redundant paths, in order to transmit the packets through this path. The Particle Swarm Optimization (PSO) is an optimization technique to find the candidate solution in the search space optimally, and it applies artificial intelligence to solve the routing problem. On the other hand, the Genetic Algorithm (GA) is a population based meta-heuristic optimization algorithm inspired by the natural evolution, such as selection, mutation and crossover. PSO can easily fall into a local optimal solution, at the same time GA is not suitable for dynamic data due to the underlying dynamic network. In this paper we propose an optimal intelligent routing, using a Hybrid PSO-GA, which also meets the QoS constraints. Moreover, it integrates the strength of PSO and GA. The QoS constraints, such as bandwidth, delay, jitter and interference are transformed into penalty functions. The simulation results show that the hybrid approach outperforms PSO and GA individually, and it takes less convergence time comparatively, keeping away from converging prematurely.

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