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Search Results: 1 - 10 of 198173 matches for " Damodar N. Shanbhag "
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Moment properties of multivariate infinitely divisible laws and criteria for self-decomposability
Theofanis Sapatinas,Damodar N. Shanbhag
Statistics , 2009,
Abstract: Ramachandran (1969, Theorem 8) has shown that for any univariate infinitely divisible distribution and any positive real number $\alpha$, an absolute moment of order $\alpha$ relative to the distribution exists (as a finite number) if and only if this is so for a certain truncated version of the corresponding L$\acute{\rm e}$vy measure. A generalized version of this result in the case of multivariate infinitely divisible distributions, involving the concept of g-moments, is given by Sato (1999, Theorem 25.3). We extend Ramachandran's theorem to the multivariate case, keeping in mind the immediate requirements under appropriate assumptions of cumulant studies of the distributions referred to; the format of Sato's theorem just referred to obviously varies from ours and seems to be having a different agenda. Also, appealing to a further criterion based on the L$\acute{\rm e}$vy measure, we identify in a certain class of multivariate infinitely divisible distributions the distributions that are self-decomposable; this throws new light on structural aspects of certain multivariate distributions such as the multivariate generalized hyperbolic distributions studied by Barndorff-Nielsen (1977) and others. Various points of relevance to the study are also addressed through specific examples.
Some new approaches to infinite divisibility
Theofanis Sapatinas,Damodar N. Shanbhag,Arjun K. Gupta
Mathematics , 2011,
Abstract: Using an approach based, amongst other things, on Proposition 1 of Kaluza (1928), Goldie (1967) and, using a different approach based especially on zeros of polynomials, Steutel (1967) have proved that each nondegenerate distribution function (d.f.) $F$ (on $\RR$, the real line), satisfying $F(0-) = 0$ and $F(x) = F(0) + (1-F(0)) G(x)$, $x > 0$, where $G$ is the d.f. corresponding to a mixture of exponential distributions, is infinitely divisible. Indeed, Proposition 1 of Kaluza (1928) implies that any nondegenerate discrete probability distribution ${p_x: x= 0,1, ...}$ that is log-convex or, in particular, completely monotone, is compound geometric, and, hence, infinitely divisible. Steutel (1970), Shanbhag & Sreehari (1977) and Steutel & van Harn (2004, Chapter VI) have given certain extensions or variations of one or more of these results. Following a modified version of the C.R. Rao et al. (2009, Section 4) approach based on the Wiener-Hopf factorization, we establish some further results of significance to the literature on infinite divisibility.
Finite Element Processes Based on GM/WF in Non-Classical Solid Mechanics  [PDF]
K. S. Surana, R. Shanbhag, J. N. Reddy
American Journal of Computational Mathematics (AJCM) , 2017, DOI: 10.4236/ajcm.2017.73024
Abstract: In non-classical thermoelastic solids incorporating internal rotation and conjugate Cauchy moment tensor the mechanical deformation is reversible. This suggests that within the realm of linear mathematical models that only consider small strains and small deformation the mechanical deformation is reversible. Hence, it is possible to recast the conservation and balance laws along with constitutive theories in a form that adjoint A* of the differential operator A in mathematical model is same as the differential operator A. This holds regardless of whether we consider an initial value problem (IVP) (when the integrals over open boundary are neglected) or boundary value problem (BVP). Thus, in such cases Galerkin method with weak form (GM/WF) for BVPs and space-time Galerkin method with weak form (STGM/WF) for IVPs are highly meritorious due to the fact that: 1) the integral form for BVPs is variationally consistent (VC) and 2) the space-time integral forms for IVP are space time variationally consistent (STVC). The consequence of VC and STVC integral forms is that the resulting coefficient matrices are symmetric and positive definite ensuring unconditionally stable computational processes for both BVPs and IVPs. Other benefits of GM/WF and space-time GM/WF are simplicity of specifying boundary conditions and initial conditions, especially traction boundary conditions and initial conditions on curved boundaries due to self-equilibrating nature of the sum of secondary variables that only exist in GM/WF due to concomitant. In fact, zero traction conditions are automatically satisfied in GM/WF, hence need not be specified at all. While VC and STVC feature also exists in least squares process (LSP) and space-time least squares finite element processes (STLSP) for BVPs and IVPs, the ease of specifying traction boundary conditions
Optimal capacitor placement for loss reduction in distribution systems using fuzzy and harmony search algorithm
M. Damodar Reddy,N. V. Vijaya Kumar
Journal of Engineering and Applied Sciences , 2012,
Abstract: This paper presents a new two-stage methodology using fuzzy and Harmony search algorithm (HSA) for the placement of capacitors on the primary feeders of the radial distribution systems with an objective to reduce the power losses and to improve the voltage profile. In the first stage, fuzzy approach is used to find the optimal capacitor locations and in the second stage, Harmony search algorithm is used to find the optimal sizes of the capacitors. The proposed method is tested on 15-bus, 33-bus, 34-bus and 69-bus test systems and the results are presented.
Screening and standardization of Adhatoda vasica used as medicine in homoeopathy using HPTLC method
D. A. Shanbhag, Amit N. Khandagale
International Journal of Research in Pharmaceutical Sciences , 2010,
Abstract: A simple and accurate HPTLC method has been developed for quantification of Adhatoda vasica and finger printing of the in-housed mother tincture considered here to be a standard with that of different marketed samples available from manufacturers of homoeopathic medicines in India. This HPTLC method was quantitatively evaluated in terms of stability, repeatability, accuracy and calibration providing the utility in the analysis of the mother tincture.
Expression of phenotypic plasticity in hatchlings of the lizard Calotes versicolor (Squamata: Agamidae): influence of nest moisture
Bhagyarekha N. Pandav,Srinivas K. Saidapur,Bhagyashri A. Shanbhag
Phyllomedusa : Journal of Herpetology , 2012,
Abstract: Calotes versicolor breed from late May to early October. The breeding activity begins with the onset of the southwest monsoon. The eggs laid in early breeding season experience more wet conditions than those of the late breeding season. We studied the influence of nest moisture levels on the phenotypic traits of hatchlings by burying the eggs in 5-cm-deep sand nests with ~50%(wet nest) or ~20% (relatively dry nest) moisture to simulate nesting conditions of early and late breeding seasons. A group of eggs were subjected to standard laboratory incubation procedure in which eggs are half-buried in the moist sand and the other half exposed to air. Hatching time and hatchling body size varied with the treatment. The eggs from dry nests hatched later and hatchlings were the biggest but possessed least amount of residual yolk compared to those of 'wet nest' and also 'lab incubated' groups. In these hatchlings head and limb sizes were significantly larger than that of the other two groups. The findings show: (1) a developmental plasticity in the lizard, (2) that under low moist conditionslarger body size is preferred, and (3) that the trade-off between somatic growth of embryos and future energy reserves (residual yolk) of hatchlings is influenced by the soil moisture in C. versicolor.
Perceptions regarding menstruation and Practices during menstrual cycles among high school going adolescent girls in resource limited settings around Bangalore city, Karnataka, India
Shanbhag D,Shilpa R,D’Souza N,Josephine P
International Journal of Collaborative Research on Internal Medicine & Public Health , 2012,
Abstract: Introduction: Hygiene-related practices of adolescents during menstruation are of importance, as it has a health impact in terms of increased vulnerability to reproductive tract infections (RTI). Therefore, increased knowledge about menstruation right from childhood may escalate safe practices and may help in mitigating the suffering of women.Objectives: To assess the perceptions and practices regarding menstrual hygiene among selected high school girls in a resource limited settings in area around Bangalore city. Methodology: This was a cross sectional study done in four selected Government High Schools in rural areas around Bangalore City. A pre-designed, pre-tested and structured questionnaire was administered. Results: A total of 506 girls were interviewed. The average age was 14.08 with Standard deviation of 1.06 and range between 12-16yrs. 99.6% of the students had heard of menstruation and 57.9% had acquired this even knowledge before attaining menarche. 73.7% knew that menstruation was a normal phenomenon but only 28.7% had knowledge regarding menstruation. 48.1% did not know that menstruation was related to pregnancy. Only 44.1% used sanitary pad during the menstrual cycles. Among those who used cloth, only 31.3% used soap and water to clean them. 56.8% used soap and water to clean their genital organs and 88.8% of the girls took bath daily during menstruation
On the rate analysis of inexact augmented Lagrangian schemes for convex optimization problems with misspecified constraints
H. Ahmadi,N. S. Aybat,U. V. Shanbhag
Mathematics , 2015,
Abstract: We consider a misspecified optimization problem that requires minimizing of a convex function f (x;q*) in x over a constraint set represented by h(x;q*)<=0, where q* is an unknown (or misspecified) vector of parameters. Suppose q* is learnt by a distinct process that generates a sequence of estimators q_k, each of which is an increasingly accurate approximation of q*. We develop a constant joint first order augmented Lagrangian scheme for computing x while simultaneously learning q*. Numerical results based on a portfolio optimization problem with a misspecified covariance matrix support the findings.
Inclusion of Indigenous Tharu People in UNDP Supported Village Development Program: A case study of Benimanipur VDC, Nawaparasi, Western-Terai, Nepal
Damodar Tripathi
Himalayan Journal of Sociology and Anthropology , 2008, DOI: 10.3126/hjsa.v3i0.1496
Abstract: Normal 0 false false false MicrosoftInternetExplorer4 By using both qualitative and quantitative data generated from primary as well as secondary sources the study tries to find out to what extent the social mobilization approach of UNDP supported Village Development Program (VDP) was effective to include and able to empower the indigenous Tharu people. The socio-economic status of majority of Tharus was weak and limited by state policies since historical period and local power relations which played the pivotal role to result to exclude them from the mainstream of development. In macro level the social mobilization approach of VDP was strong to initiate the issue of inclusion to empower the marginalized people, but in local level it was weak to implement the policies efficiently and effectively regards to local diverse conditions and differentiated actors. The diversity in the village resulted in the different responses to the social mobilization program. Particularly the social mobilization process was generalized and limited by the local networks of power relation. DOI: http://dx.doi.org/10.3126/hjsa.v3i0.1496 Himalayan Journal of Sociology and Anthropology Vol.III, Sept. 2008 p.54-72
The healthy workplace initiative
Shanbhag S
Indian Journal of Occupational and Environmental Medicine , 2010,
Abstract:
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