Ram M.,Graphic Era University |
Singh S.B.,Sudan University of Science and Technology |
Singh V.V.,P.A. College
IEEE Transactions on Systems, Man, and Cybernetics Part A:Systems and Humans | Year: 2013
This paper investigates the reliability of a standby system incorporating waiting time to repair. The considered system consists of two units, namely, the main unit and the standby unit. Whenever the main unit fails, the whole load is transferred to the standby unit instantaneously by a switching-over device. As regards to the repairing of the main unit, it has to wait for repair whenever it fails due to unavailability of repair facility. When both the main and standby units fail, then the system goes to the complete failure mode. The system may also fail due to incorrect start of the system, which can occur due to an untrained and inexperience operator. The repair of the main and standby units follows general distribution, whereas repair due to human error is obtained with the help of Gumbel-Hougaard family copula. The system is analyzed by supplementary variable technique and Laplace transformation. Various reliability measures like availability, mean time to failure, and profit function have been evaluated for the considered system. A numerical example with a way to illustrate the utility of the model has also been presented. © 2013 IEEE.
Kumar D.,Graphic Era University |
Kaur D.,Indian Institute of Technology Roorkee
Journal of Alloys and Compounds | Year: 2013
In the present work, the effect of film thickness on the structural and magnetic properties of La2NiMnO6 (LNMO) ferromagnetic double perovskite thin films has been systematically investigated. LNMO thin films of varying thickness from 54 nm to 256 nm were deposited using the pulsed laser deposition technique onto single-crystalline LaAlO3 substrate. The X-ray diffraction pattern and Raman scattering observations reveal that all films have c-axis epitaxial growth and an orthorhombic structure. The Raman spectra of the films are dominated by two broad peaks at around 534 cm -1 and 676 cm-1 assigned to the antisymmetric stretching (AS) and symmetric stretching (S) vibrations of the octahedra, respectively. The Raman peaks of the LNMO thin films are blue shifted in comparison to those of bulk LNMO and the shift increases with decreasing film thickness, indicating the increased influence of strain. The critical thickness for strain relaxation, as determined from the Raman spectra, is between 110 nm and 156 nm. However, the strain is observed to have large effect on the magnetic properties of films. Ferromagnetic to paramagnetic transition temperature (Tc) and the saturation magnetization were found to increase with increase in the film thickness. The film with thickness of 256 nm exhibits a saturation magnetic moment of 4.5 μB/f.u. and coercive field of 630 Oe at 10 K, with a Curie temperature close to 280 K. © 2012 Elsevier B.V. All rights reserved.
Prasad R.S.,Graphic Era University |
Semwal S.,Graphic Era University
SysCon 2013 - 7th Annual IEEE International Systems Conference, Proceedings | Year: 2013
Renewable energy sources are slowly but surely supplementing conventional sources of energy. These energy sources create a large number of micro-grids which become a part of the main grid. Smart meters are essential components in smart micro-grids and smart grids. Together they form a complex system which has become today an attractive area of research world-wide in view of enormous benefits of reliability and safety of power supply economically. Several studies in smart meter applications have shown that in residential buildings, energy consumption can be reduced up to 15% with better management. For this, a non-intrusive appliance load monitoring (NIALM) technique has been advocated which enables appliance identification to help better energy management. The identification is done using load signatures with appropriate algorithm. Several features of load signatures ranging from voltage and current profiles (steady states and transients) to a plethora of features such as active power (P) and reactive power (Q), power factor (pf), harmonic components (h), magnitudes of h (mh), current waveform (CW), eigen values, switching transient waveform, instantaneous admittance waveform, etc have been used in NIALM. The algorithms used vary from a 'single algorithm' to 'multiple algorithms', the latter used in 'Committee Decision Mechanism' (CDM) in which majority of 'votes' (i.e., agreement), 'cast' by each of the algorithms, decides the final result of appliances identified. This scenario presents a serious difficulty with regard to choice of features and algorithms, besides the possibility of increasing the hardware and software costs of smart meters. The motivation for the study in this paper is provided by this scenario. The basic objective of this paper is to investigate the possibility of including only a limited number of features as load signature of appliances, and the use of only a single algorithm to effectively implement NIALM without any ambiguity. Results of our study so far indicate that generally only four features of P, Q, h and mh are sufficient for detection of appliances in operation; however, in some cases (∼>10%), the additional feature, CW, may be needed for final identification The experiments conducted so far yielded unambiguous identification of appliances and the results are encouraging enough for possible use in practice for residential loads only. © 2013 IEEE.
Gupta A.,Graphic Era University
Acoustical Physics | Year: 2014
This paper presents a review study on sonic crystal, their development and present status. The paper also focuses on some of the applications of sonic crystal and numerical methods to study these crystals. Sonic crystals are periodic arrangement of scatterers, whose interaction with acoustic waves leads to the formation of band gap. Band gap are regions of frequencies where the sound propagation is significantly restricted from the sonic crystal. This property is used in many applications such as sound barrier, frequency filter, acoustic imaging etc. The paper presents a review of all these applications. Further the paper presents some of the numerical methods used to calculate the band gap formation in sonic crystal. © 2014 Pleiades Publishing, Ltd.
Ram M.,Graphic Era University
International Journal of Systems Assurance Engineering and Management | Year: 2013
In the modern scenario, reliability has becomes the most challenging and demanding theory. The theory and the methods of reliability analysis have been developed significantly during the last 40 years and have also been acknowledged in a number of publications. So, a reliability engineer is aware about the importance of each reliability measure of the system and its fields. In this research work, a survey of reliability approaches in various fields of engineering and physical sciences is carried out. In this survey, the author tried to provide the major areas i.e. past, current and future trends of reliability methods and applications for the readers. © 2013 The Society for Reliability Engineering, Quality and Operations Management (SREQOM), India and The Division of Operation and Maintenance, Lulea University of Technology, Sweden.
Awasthi M.K.,Indian Institute of Technology Roorkee |
Awasthi M.K.,Graphic Era University
Journal of Heat Transfer | Year: 2013
Viscous corrections for the viscous potential flow analysis of Rayleigh-Taylor instability of two viscous fluids when there is heat and mass transfer across the interface have been considered. Both fluids are taken as incompressible and viscous with different kinematic viscosities. In viscous potential flow theory, viscosity enters through a normal stress balance and the effects of shearing stresses are completely neglected. We include the viscous pressure in the normal stress balance along with irrotational pressure and it is assumed that this viscous pressure will resolve the discontinuity of the tangential stresses at the interface of the two fluids. It has been observed that heat and mass transfer has a stabilizing effect on the stability of the system. It has been shown that the irrotational viscous flow with viscous corrections gives rise to exactly the same dispersion relation as the dissipation method in which no pressure term is required and the viscous effect is accounted for by evaluating viscous dissipation using irrotational flow. It has been observed that the inclusion of irrotational shearing stresses has a stabilizing effect on the stability of the system. Copyright © 2013 by ASME.
Tripathi R.P.,Graphic Era University
International Journal of Industrial Engineering Computations | Year: 2013
This paper deals with the development of an inventory model for time varying demand and constant demand; and time dependent holding cost and constant holding cost for case 1 and case 2 respectively. Previous models incorporating that the holding cost is constant for the entire inventory cycle. Mathematical model has been developed for determining the optimal order quantity, the optimal cycle time and optimal total inventory cost for both cases. Differential calculus is used for finding optimal solution. Numerical examples are given for both cases to validate the proposed model. Sensitivity analysis is carried out to analyze the effect of changes in the optimal solution with respect to change in various parameters. © 2013 Growing Science Ltd. All rights reserved.
Awasthi M.K.,Graphic Era University |
Asthana R.,Galgotias University
International Communications in Heat and Mass Transfer | Year: 2013
The capillary instability of the cylindrical interface separating two viscous and incompressible fluids through porous medium is studied using viscous potential flow theory, when there is heat and mass transfer across the interface. The fluids are considered to be viscous and incompressible with different kinematic viscosities. A dispersion relation that accounts for the growth of axisymmetric waves is derived and stability is discussed theoretically as well as numerically. Stability criterion is given in terms of critical value of wave number. Various graphs have been drawn to show the effect of various physical parameters such as heat transfer capillary number, viscosity ratio, permeability and porosity on the stability of the system. It has been observed that porous media and heat transfer both have stabilizing effect while porosity has destabilizing effect on the stability of the system. © 2012 Elsevier Ltd.
Katal A.,Graphic Era University |
Wazid M.,Graphic Era University |
Goudar R.H.,Graphic Era University
2013 6th International Conference on Contemporary Computing, IC3 2013 | Year: 2013
Big data is defined as large amount of data which requires new technologies and architectures so that it becomes possible to extract value from it by capturing and analysis process. Due to such large size of data it becomes very difficult to perform effective analysis using the existing traditional techniques. Big data due to its various properties like volume, velocity, variety, variability, value and complexity put forward many challenges. Since Big data is a recent upcoming technology in the market which can bring huge benefits to the business organizations, it becomes necessary that various challenges and issues associated in bringing and adapting to this technology are brought into light. This paper introduces the Big data technology along with its importance in the modern world and existing projects which are effective and important in changing the concept of science into big science and society too. The various challenges and issues in adapting and accepting Big data technology, its tools (Hadoop) are also discussed in detail along with the problems Hadoop is facing. The paper concludes with the Good Big data practices to be followed. © 2013 IEEE.
Graphic Era University | Date: 2015-07-27
A system and method thereof for secure authentication using multimedia contents set particular to user (MCSPU) and user specified parameters is disclosed. A host system for performing an authentication with a user system is disclosed. The host system comprises of a processor; and a memory coupled to said processor for executing a plurality of modules present in said memory. For the authentication (while logging in or performing a transaction), the host system would provide to the user one or more elements belonging to MCSPU, after embedding, within the elements the authentication related critical information using the user specific parameters. The proposed method ensures the user that the response is coming from authentic system. In case of suspicious user behavior, the parameters or multimedia contents not specific to the user could be used.