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Search Results: 1 - 10 of 589 matches for " Arjun Ponnusamy "
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Secure Military Social Networking and Rapid Sensemaking in Domain Specific Concept Systems: Research Issues and Future Solutions
Debbie Garside,Arjun Ponnusamy,Steve Chan,Richard Picking
Future Internet , 2012, DOI: 10.3390/fi4010253
Abstract: This paper identifies the need for a secure military social networking site and the underlying research issues linked to the successful development of such sites. The paper further proposes a solution to the most basic issues by identifying and tackling known potential security threats to military personnel and their families. The paper further defines the base platform for this development to facilitate rapid sensemaking to inform critical communications and rapid decision making processes during abrupt governance and eco-system change, and how the plethora of information (termed as Big Data) on social networking sites can be analysed and harnessed. Underlying architectural issues, efficiency and complexity are explored and their future development is considered.
Effect of Magnesium on the Mechanical and Bioactive Properties of Biphasic Calcium Phosphate  [PDF]
Ponnusamy Kanchana, Chinnathambi Sekar
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.1110099
Abstract: Incorporation of trace elements into calcium phosphate structure is of great interest for the development of artificial bone implants. Biphasic calcium phosphate (BCP) composed of hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) have been synthesized in the presence of magnesium (5 M% - 20 M%) by gel method under physiological conditions. Crystallization of Mg-BCP in the gel medium mimics the Mg intake in the human body. Powder X-ray dif- fraction and Fourier transform infrared analyses confirmed that the Mg doping leads to the enrichment of β-TCP phase and suppresses the HA content in BCP. Nanoindentation studies indicate a significant decrease in hardness and elastic modulus values of BCP due to Mg doping. In vitro bioactivity study has confirmed the formation of apatite layer on the Mg doped samples making it suitable for bone replacement. The results suggest that the optimum Mg doping promotes the bioactivity which is perquisite for biomedical applications.
Three-dimensional dispersion analysis of homogeneous transversely isotropic thermo elastic solid bar of polygonal cross-sections immersed in fluid
P Ponnusamy
International Journal of Engineering, Science and Technology , 2011,
Abstract: The problem of wave propagation in an infinite, homogeneous, transversely isotropic thermo elastic polygonal cross-sectional bar immersed in fluid is studied using Fourier expansion collocation method, with in the framework of linearized, three dimensional theory of thermoelasticity. Three displacement potential functions are introduced, to uncouple the equations of motion and the heat conduction. The frequency equations are obtained for longitudinal and flexural (symmetric and antisymmetric) modes of vibration and are studied numerically for triangular, square, pentagonal and hexagonal cross- sectional Zinc bar. The computed non-dimensional wave numbers are presented in the form of dispersion curves.
Landslide Hazard Mapping of Nagadhunga-Naubise Section of the Tribhuvan Highway in Nepal with GIS Application  [PDF]
Arjun Raj Pandey, Farzad Shahbodaghlou
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.66059
Abstract: The aim of this project was to prepare and study a hazard map of Nagadhunga-Naubise section of the Tribhuvan highway. This section lies in the Middle Mountain region of Nepal. For the preparation of the hazard map of the corridor three steps, initial study, field investigation, and data analysis and presentation were carried out. In the initial study, the collection of available data and review of the literature were done. The base map was then prepared from the topographical map. In the field investigation step, all information and maps prepared earlier in the initial study were verified by field check. In the final step, prepared and verified data were then analyzed for the hazard mapping. Topography (gradient, slope shape and slope aspect), geology, drainage and land-use were considered to be the major influencing factors in the slope stability. Pre-assigned hazard rating method was used for hazard mapping of the study area. The area was divided into equal facets. Then ratings of responsible factors to the hazard were assigned to each facet and overlaid based upon a predetermined rating scheme. Total estimated hazard was the sum of these ratings for each overlay. Hazard map was prepared by using three categories as low hazard, medium hazard and high hazard. The Geographic Information System (GIS) was the main tool for the data input, analysis, and preparing of the final hazard map. The hazard map showed the areas of different hazard potential classes of; “low” with 32% portion, “Medium” with 51%, and “high” with 17% portion.
Energy Efficient Charge Recovery for Positive Feedback Adiabatic Logic
Ponnusamy Vijayakumar,Gunavathi K
IETE Technical Review , 2007,
Abstract: This paper proposes an efficient charge recovery positive feedback adiabatic logic (PFAL). In the proposed technique (IPFAL), the original PFAL is modified so as to include an additional charge recovery path in parallel to the cross coupled PMOS transistors. PFAL is proved to be energy efficient among adiabatic logic families. Complex logic gates were developed using IPFAL and simulated using 3.3 V, 0.18pm, CMOS technology. The simulation results show that the proposed technique reduces the power by more than 15% as compared to the other adiabatic logics particularly PFAL for basic inverter. The circuits were found to be functional beyond a power clock frequency of 800 MHz with negligible area overhead. To illustrate the energy recovery current waveforms are also given for the IPFAL Inverter at 600 MHz. This technique is also verified by applying it to a number of ISCAS benchmark circuits. Results prove that the maximum power saving is around 80% in IPFAL when compared to static CMOS.
PSO tuned Adaptive Neuro-fuzzy Controller for Vehicle Suspension Systems
Rajeswari Kothandaraman,Lakshmi Ponnusamy
Journal of Advances in Information Technology , 2012, DOI: 10.4304/jait.3.1.57-63
Abstract: In this paper, Particle Swarm Optimization (PSO) technique is applied to tune the Adaptive Neuro Fuzzy Controller (ANFIS) for vehicle suspension system. LQR controller is used to obtain the training data set for the vehicle suspension system. Subtractive clustering technique is used to formulate ANFIS which approximates the actuator output force as a function of system states. PSO algorithm search for optimal radii for subtractive clustering based ANFIS. Training is done off line and the cost function is based on the minimization of the error between actual and approximated output. Simulation results show that the PSO-ANFIS based vehicle suspension system exhibits an improved ride comfort and good road holding ability.
Region of variability for functions with positive real part
S. Ponnusamy,A. Vasudevarao
Mathematics , 2010,
Abstract: For $\gamma\in\IC$ such that $|\gamma|<\pi/2$ and $0\leq\beta<1$, let ${\mathcal P}_{\gamma,\beta} $ denote the class of all analytic functions $P$ in the unit disk $\mathbb{D}$ with $P(0)=1$ and $$ {\rm Re\,} \left (e^{i\gamma}P(z)\right)>\beta\cos\gamma \quad \mbox{ in ${\mathbb D}$}. $$ For any fixed $z_0\in\mathbb{D}$ and $\lambda\in\overline{\mathbb{D}}$, we shall determine the region of variability $V_{\mathcal{P}}(z_0,\lambda)$ for $\int_0^{z_0}P(\zeta)\,d\zeta$ when $P$ ranges over the class $$ \mathcal{P}(\lambda) = \left\{ P\in{\mathcal P}_{\gamma,\beta} :\, P'(0)=2(1-\beta)\lambda e^{-i\gamma}\cos\gamma \right\}. $$ As a consequence, we present the region of variability for some subclasses of univalent functions. We also graphically illustrate the region of variability for several sets of parameters.
Univalent harmonic mappings with integer or half-integer coefficients
S. Ponnusamy,J. Qiao
Mathematics , 2012,
Abstract: Let ${\mathcal S}$ denote the set of all univalent analytic functions $f(z)=z+\sum_{n=2}^{\infty}a_n z^n$ on the unit disk $|z|<1$. In 1946 B. Friedman found that the set $\mathcal S$ of those functions which have integer coefficients consists of only nine functions. In a recent paper Hiranuma and Sugawa proved that the similar set obtained for the functions with half-integer coefficients consists of twelve functions in addition to the nine. In this paper, the main aim is to discuss the class of all sense-preserving univalent harmonic mappings $f$ on the unit disk with integer or half-integer coefficients for the analytic and co-analytic parts of $f$. Secondly, we consider the class of univalent harmonic mappings with integer coefficients, and consider the convexity in real direction and convexity in imaginary direction of these mappings. Thirdly, we determine the set of univalent harmonic mappings with half-integer coefficients which are convex in real direction or convex in imaginary direction.
Univalence of the average of two analytic functions
M. Obradovi?,S. Ponnusamy
Mathematics , 2012,
Abstract: Let $\mathcal{A}$ denote the set of all analytic functions $f$ in the unit disk $\ID=\{z:\,|z|<1\}$ of the form $f(z)=z+\sum_{n=2}^{\infty}a_nz^n.$ Let $\mathcal{U}$ denote the set of all $f\in \mathcal{A}$, $f(z)/z\neq 0$ and satisfying the condition $$ | f'(z) (\frac{z}{f(z)})^{2}-1 | < 1 {for $z\in \ID$}. $$ Functions in ${\mathcal U}$ are known to be univalent in $\ID$. For $\alpha \in [0,1]$, let $$ \mathcal{N}(\alpha)= \{f_\alpha :\, f_\alpha (z)=(1-\alpha)f(z)+\alpha \int_0^z\frac{f(t)}{t}\,dt, {$f\in\mathcal{A}$ with $|a_n|\leq n$ for $n\geq 2$}\}. $$ In this paper, we first show that the condition $\sum_{n=2}^{\infty}n|a_n|\leq 1$ is sufficient for $f$ to be in ${\mathcal U}$ and the same condition is necessary for $f\in {\mathcal U}$ in case all $a_n$'s are negative. Next, we obtain the radius of univalence of functions in the class $\mathcal{N}(\alpha)$. Also, for $f,g\in \mathcal{U}$ with $\frac{f(z)+g(z)}{z}\neq 0$ in $\ID$, $F(z)=(f(z)+g(z))/2$, and $G(z)=r^{-1}F(rz)$, we determine a range of $r$ such that $G\in {\mathcal U}$. As a consequence of these results, several special cases are presented.
Distortion and covering theorems of pluriharmonic mappings
Sh. Chen,S. Ponnusamy
Mathematics , 2014,
Abstract: In this paper, we mainly investigate distortion and covering theorems on some classes of pluriharmonic mappings.
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