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Search Results: 1 - 10 of 191078 matches for " G. Shankar "
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Innovative SQA Service Maturity Model using CMMI and ITIL
G. Shankar
Computer Science , 2012,
Abstract: This Journal details a maturity model for SQA services which has been developed during QMS implementation in the IT division of a large multinational organization. The scope of the engagement was to establish a standard set of processes based on CMMI\textregistered and ITIL\textregistered Framework across four business verticals scattered in Europe, United States and Asia. The services of Software Quality Analyst (SQA) from different vendors were leveraged to facilitate implementation of processes which was referred to as the Quality Management System (QMS). To co-ordinate and support QMS implementation, a Software Quality Assurance Group (SQAG) was established at the organizational level. Considering the large number of applications, the business verticals proposed that process implementation should be owned and managed by practitioners themselves so that the mass deployment of QMS can be achieved at a faster rate with the same SQA capacity. This called for a need to devise an innovative implementation solution before moving to a process implementation model which proposed Project Managers implementing processes themself. While there are process models and frameworks available in the market for establishing processes in an organization, there is no model that elaborates activities to be performed by the SQA for effective implementation of processes. SQA service maturity model was proposed as a solution based on CMMI\textregistered and developed to eventually proceed towards a 'Process Implementation Model proposing Project Managers implementing processes themself'. SQA Service Maturity Model is a Software Quality Assurance implementation framework that enables organisations to increase Efficiencies in Software Quality Assurance, reduce the Cost of Defects and ultimately Increasing Return on Investment in IT.
Positive and Negative Syndrome Scale as a long-term outcome measurement tool in patients receiving clozapine ODT- A Pilot Study.
Shankar G,Nate C
Pharmacy Practice (Granada) , 2007,
Abstract: Objective: This pilot, twelve-week, open-label study examined the effect of clozapine orally disintegrating tablet or ODT in patients with schizophrenia and schizoaffective disorder utilizing Positive and Negative Syndrome Scale (PANSS) as a long-term outcome measurement tool.Methods: The final study sample consisted of nineteen subjects who were residents a long-term care psychiatric facility in Pomona, California. Subjects were using clozapine ODT (FazaClo ) at the most clinically effective dosage depending on their symptoms and at the discretion of the psychiatrist and psychopharm consultant. PANSS were administered at baseline, week-4, week-8 and week-12. Paired sample t-tests were used to calculate the statistical significance of the mean differences for scores at baseline and week-12. Results: Mean differences from baseline indicated significant improvement on total score, as well as positive, negative, cognitive and general psychopathology subscales after twelve weeks of treatment. The greater average reduction in the negative syndrome subscale across the twelve weeks possibly illustrates the ability of clozapine ODT in improving negative symptoms, including cognitive function which is their ability to participate in their personal care and creative expressions in dance, arts, games, poetry to a greater extent their overall, quality of life and living along with the effect on positive symptoms.Conclusion: Overall, clozapine proved to affect a broad range of psychopathology including cognitive functions in this schizophrenic sample.
Plasmons, Magnetoplasmons and the ν= 1/2 Quantum Hall Effect
R. Shankar,G. Murthy
Physics , 1996,
Abstract: We address the problem of separating the short-distance, high-energy physics of cyclotron motion from the long- distance, low-energy physics within the Lowest Landau Level in field theoretic treatments of the Fractional Quantum Hall Effect. We illustrate our method for the case $\nu =1/2$. By a sequence of field transformations we go from electrons to fermions that carry flux tubes of thickness $l_o$ (cyclotron radius) and couple to harmonic oscillators corresponding to magnetoplasmons. The fermions keep track of the low energy physics while the oscillators describe the Landau level, cyclotron currents etc. From this starting point we are able to get Jain and Rezayi-Read wavefunctions, and many subsequent modifications of the RPA analysis of Halperin, Lee and Read.
Exact quantum spin liquids with Fermi surfaces in spin-half models
G. Baskaran,G. Santhosh,R. Shankar
Physics , 2009,
Abstract: An emergent Fermi surface in a Mott insulator, an exotic quantum spin liquid state, was suggested by Anderson in 1987. After a quick support for its existence in spin-half Heisenberg model in a square lattice in a RVB mean field theory, pseudo Fermi surface was found only recently in an exactly solvable spin-3/2 model by Yao, Zhang and Kivelson. We show that a minimal spin-half Kitaev model on a decorated square lattice exhibits a Fermi surface. Volume and shape of the Fermi surface change with exchange couplings or on addition of a 3 spin interaction terms.
High Energy Optical Resistivity Study on Nonlinear Optical Pyrrolidinomethylpthalamide Crystal
G. Shankar,P.S. Joseph
Research Journal of Applied Sciences , 2012, DOI: 10.3923/rjasci.2010.212.214
Abstract: PMP crystal shown was synthesized. The PMP single crystal was grown by slow evaporation solution technique. The grown crystals were characterized by powder crystal X-ray diffraction, FTIR spectrum. The crystal structure and unit cell parameters were analyzed from the X-ray diffraction studies. The FTIR spectrum analysis has confirmed the functional group in the PMP crystals. The high energy optical resistivity studies have been carried out on this crystal and the results have been shown here.
Genetic and Non-Genetic factors affecting body weight of buffaloes
Shashi Shankar and K.G. Mandal
Veterinary World , 2010,
Abstract: The present experiment was conducted on 60 randomly selected dairy units consisting of 116 Graded Murrah,70 Diara type and 121 Non-descript type buffalo cows utilizing the procedure of ‘’stratified random sampling with proportional allocation (Snedecor & Cochran,1967) in and around Patna.Genetic factors were the three different genetic groups of buffaloes viz. Graded murrah,Diara and Non-descript types prevalent in Bihar.Where as Non-genetic factors included in the study were location of herd,faming system and sequence of lactation.The average estimates of body weight of Graded murrah, Diara and Non-descript were found to be 508.972+3.36, 461.789+3.32 and 483.857+3.30 kg respectively. The three genetic groups of buffaloes differed significantly (p<0.05) among themselves with respect to their body weight.Farming system and lactation order had significant(p<0.01) influence on body weight. Body weight of the animals was the lowest at first parity and then increased significantly (p<0.05) in subsequent parities. [Vet. World 2010; 3(5.000): 227-229]
Seismic Behaviour of Exterior Reinforced Concrete Beam-Column Joints in High Performance Concrete Using Metakaolin and Partial Replacement with Quarry Dust
G. R. Vijay Shankar,D. Suji
ISRN Materials Science , 2014, DOI: 10.1155/2014/361962
Abstract: Recent earthquakes have demonstrated that most of the reinforced concrete structures were severely damaged; the beam-column joints, being the lateral and vertical load resisting members in reinforced concrete structures, are particularly vulnerable to failures during earthquakes. The existing reinforced concrete beam-column joints are not designed as per code IS13920:1993. Investigation of high performance concrete (HPC) joints with conventional concrete (CC) joints (exterior beam-column) was performed by comparing various reinforcement detailing schemes. Ten specimens were considered in this investigation and the results were compared: four specimens with CC (with and without seismic detailing), four specimens with HPC (with and without seismic detailing), and two specimens with HPC at confinement joint. The test was conducted for lateral load displacement, hysteresis loop, load ratio, percent of initial stiffness versus displacement curve, total energy dissipation, strain in beam main bars, and crack pattern. The results reveal that HPC with seismic detailing will be better compared with other reinforcements details under cyclic loading and reverse cyclic loading. 1. Introduction Earthquakes present a threat to public safety and welfare in a significant portion everywhere. We cannot stop earthquakes, but we can protect ourselves from them, as “earthquakes do not kill human beings, but the structures do.” The behaviour of reinforced concrete moment resisting frame structures in recent earthquakes all over the world has highlighted the consequences of poor performance of beam-column joints. Beam-column joints in a reinforced concrete moment resisting frame are crucial zones for transfer of loads effectively between the connecting elements (i.e., beams and columns) in the structure. In the analysis of reinforced concrete moment resisting frames, the joints are generally assumed as rigid. In Indian practice, the joint is usually neglected for specific design with attention being restricted to provision of sufficient anchorage for beam longitudinal reinforcement. This may be acceptable when the frame is not subjected to earthquake loads. The poor design practice of beam-column joints is compounded by the high demand imposed by the adjoining flexural members (beams and columns) in the event of mobilizing their inelastic capacities to dissipate seismic energy. For the past three decades, extensive research has been carried out on studying the behaviour of joints under seismic conditions through experimental and analytical studies. Various international codes
Exact results for spin dynamics and fractionization in the Kitaev Model
G. Baskaran,Saptarshi Mandal,R. Shankar
Physics , 2006, DOI: 10.1103/PhysRevLett.98.247201
Abstract: We present certain exact analytical results for dynamical spin correlation functions in the Kitaev Model. It is the first result of its kind in non-trivial quantum spin models. The result is also novel: in spite of presence of gapless propagating Majorana fermion excitations, dynamical two spin correlation functions are identically zero beyond nearest neighbor separation, showing existence of a gapless but short range spin liquid. An unusual, \emph{all energy scale fractionization}of a spin -flip quanta, into two infinitely massive $\pi$-fluxes and a dynamical Majorana fermion, is shown to occur. As the Kitaev Model exemplifies topological quantum computation, our result presents new insights into qubit dynamics and generation of topological excitations.
Spin-S Kitaev model: Classical Ground States, Order by Disorder and Exact Correlation Functions
G. Baskaran,Diptiman Sen,R. Shankar
Physics , 2008, DOI: 10.1103/PhysRevB.78.115116
Abstract: In the first part of this paper, we study the spin-S Kitaev model using spin wave theory. We discover a remarkable geometry of the minimum energy surface in the N-spin space. The classical ground states, called Cartesian or CN-ground states, whose number grows exponentially with the number of spins N, form a set of points in the N-spin space. These points are connected by a network of flat valleys in the N-spin space, giving rise to a continuous family of classical ground states. Further, the CN-ground states have a correspondence with dimer coverings and with self avoiding walks on a honeycomb lattice. The zero point energy of our spin wave theory picks out a subset from a continuous family of classically degenerate states as the quantum ground states; the number of these states also grows exponentially with N. In the second part, we present some exact results. For arbitrary spin-S, we show that localized Z_2 flux excitations are present by constructing plaquette operators with eigenvalues \pm 1 which commute with the Hamiltonian. This set of commuting plaquette operators leads to an exact vanishing of the spin-spin correlation functions, beyond nearest neighbor separation, found earlier for the spin-1/2 model [G. Baskaran, S. Mandal and R. Shankar, Phys. Rev. Lett. 98, 247201 (2007)]. We introduce a generalized Jordan-Wigner transformation for the case of general spin-S, and find a complete set of commuting link operators, similar to the spin-1/2 model, thereby making the Z_2 gauge structure more manifest. The Jordan-Wigner construction also leads, in a natural fashion, to Majorana fermion operators for half-integer spin cases and hard-core boson operators for integer spin cases, strongly suggesting the presence of Majorana fermion and boson excitations in the respective low energy sectors.
RVB gauge theory and the Topological degeneracy in the Honeycomb Kitaev model
Saptarshi Mandal,R. Shankar,G. Baskaran
Physics , 2011, DOI: 10.1088/1751-8113/45/33/335304
Abstract: We relate the Z$_2$ gauge theory formalism of the Kitaev model to the SU(2) gauge theory of the resonating valence bond (RVB) physics. Further, we reformulate a known Jordan-Wigner transformation of Kitaev model on a torus in a general way that shows that it can be thought of as a Z$_2$ gauge fixing procedure. The conserved quantities simplify in terms of the gauge invariant Jordan-Wigner fermions, enabling us to construct exact eigen states and calculate physical quantities. We calculate the fermionic spectrum for flux free sector for different gauge field configurations and show that the ground state is four-fold degenerate on a torus in thermodynamic limit. Further on a torus we construct four mutually anti-commuting operators which enable us to prove that all eigenstates of this model are four fold degenerate in thermodynamic limit.
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