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Search Results: 1 - 10 of 712 matches for " Priya Ramar "
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Sleep Problems in Chronic Obstructive Pulmonary Disease
Kannan Ramar
Turk Toraks Dergisi , 2008,
Abstract: Effects of chronic obstructive pulmonary disease (COPD) during sleep is stil being investigated. Sleep problems affect as many as 50% of people with COPD. Patients with COPD have an increased risk while asleep that leads to gas exchange abnormalities resulting in significant hypoxemia and related clinical consequences like pulmonary hypertension, arrhythmias and possibly death, This review will discuss the physiology of breathing in normal subjects while asleep, followed by sleep related issues specific to COPD patients, and current diagnostic and treatment options.
A stronger model for peg solitaire, II
Olivier Ramaré
Mathematics , 2008,
Abstract: The main problem addressed here is to decide whether it is possible or not to go from a given position on a peg-solitaire board to another one. No non-trivial sufficient conditions are known, but tests have been devised to show impossibility. We expose the way these tests work in a unified formalism and provide a new test which is strictly stronger than all previous ones.
On the behaviour of $γ\Log p$ modulo 1
Olivier Ramaré
Mathematics , 2012,
Abstract: We prove non-trivial lower bounds for sums of type $\sum_{p\sim P}g(\gamma\Log p)$, where $g$ is a non-negative $2\pi$-periodical function and $\gamma$ is a given parameter. As an application we prove that $\zeta(1+it)^{\pm1}\ll\Log\Log (9+|t|)$ and extend the zero-free region of the Riemann zeta-function.
Harmonic Minimization in Seven-Level Cascaded Multilevel Inverter Using Evolutionary Algorithm  [PDF]
Jeyabharath Rajaiah, Velmurugan Ramar, Veena Parasunath
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79201
Abstract: Inverters are power electronic devices that change over DC to sinusoidal AC quantity. Be that as it may, in down to earth, these devices produce non-sinusoidal yield which contains harmonics, so as to blend a close sinusoidal component and to lessen the harmonic distortion multilevel inverters developed. Mathematical methods, which were developed, are derivative based and need initial considerations. To overcome this, evolutionary algorithms, which are derivative free and accurate, were developed for obtaining multi levels of output voltage. The proposed work uses two evolutionary algorithms, namely, Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) algorithm. These algorithms are used to generate the switching angles by satisfying the non linear transcendental equations that govern the low order harmonic components. A seven level cascaded full bridge inverter is designed using MATLAB/Simulink and the results validate the resultsfor switching angles. The Total Harmonic Distortion (THD) value obtained for GA and PSO is 11.81%and 10.84% respectively. The solution obtained from GA algorithm was implemented in hardware using dsPIC controller to validate the simulation results. The THD value obtained for cascaded seven-level multilevel inverter in the hardware prototype is 25.9%.
Rule Based Network Intrusion Detection System Based on Crossover and Mutuation
S. Jeya,K. Ramar
Asian Journal of Information Technology , 2012,
Abstract: Quickly increased complexity, openness, interconnection and interdependence have made computer systems more vulnerable and difficult to protect from malicious attacks. Network intrusion detection system plays a vital role in today`s network. In this system using Genetic Algorithm (GA), crossover, mutation and other related techniques to used to detect network intrusion system. As the transmission of data over the Internet increases, the need to protect connected systems also increases. Although, the field of IDSs is still developing, the systems that do exist are still not complete, in the sense that they are not able to detect all types of intrusions. Some attacks which are detected by various tools available today cannot be detected by other products, depending on the types and methods that they are built on. Network Intrusion Detection Systems based on crossover and mutation is the latest technology used for this purpose. The network intrusion detection system should be adaptable to all type of critical situations arise in network. This is helpful for identification of complex anomalous behaviors. This research is focused on the TCP/IP network protocols.
Image Segmentation Using Morphological Filters and Region Merging
N. Santhi,K. Ramar
Asian Journal of Information Technology , 2012,
Abstract: Automatic image segmentation is one of the most Challenging problems in computer vision. This study presents a novel algorithm to partition an image with low Depth-of-Field (DOF) into focused Object-of-Interest (OOI) and defocused background. The proposed algorithm unfolds into three steps. In the first step, we transform the low-DOF image into an appropriate feature space, in which the spatial distribution of the high-frequency components is represented. This is conducted by computing Higher Order Statistics (HOS) for all pixels in the low-DOF image. Next, the obtained feature space, which is called HOS map in this paper, is simplified by removing small dark holes and bright patches using a morphological filter by reconstruction. Finally, the OOI is extracted by applying region merging to the simplified image and by thresholding. Unlike the previous methods that rely on sharp details of OOI only, the proposed algorithm complements the limitation of them by using morphological filters, which also allows perfect preservation of the contour information.
Classification of Agricultural Land Soils: A Data Mining Approach
V. Ramesh,K. Ramar
Agricultural Journal , 2013, DOI: 10.3923/aj.2011.82.86
Abstract: The problem of the knowledge acquisition and efficient knowledge exploitation is very popular also in agriculture area. One of the methods for knowledge acquisition from the existing agricultural databases is the methods of classification. In agricultural decision making process, weather and soil characteristics are play an important role. This research aimed to assess the various classification techniques of data mining and apply them to a soil science database to establish if meaningful relationships can be found. A large data set of soil database is extracted from the Soil Science and Agricultural Department, Kanchipuram and National Informatics Centre, Tamil Nadu. The application of data mining techniques has never been conducted for Tamil Nadu soil data sets. The research compares the different classifiers and the outcome of this research could improve the management and systems of soil uses throughout a large number of fields that include agriculture, horticulture, environmental and land use management.
Comparison of Class Inheritance and Interface Usage in Object Oriented Programming through Complexity Measures
V. Krishnapriya,K. Ramar
International Journal of Computer Science & Information Technology , 2010,
Abstract: It is widely acknowledged that in software engineering, the usage of metrics at the initial phases of theobject oriented software can help designers to make better decisions. The quality of class diagrams couldbe a major determinant for the quality of the software product that is finally delivered. Quantitativemeasurements are useful to assess class diagram quality. Following this innovative thinking, two UMLclass diagrams are taken to measure the complexity and size. A set of metrics of complexity measures areused to measure the class diagrams. Seven known complexity measures are evaluated and compared forinheritance and interface usage in object oriented programming. Two UML class diagrams areintroduced with possible interfaces and measured the complexity metrics and a comparison has beenmade between the class inheritance and class interface usage through complexity measurements.
Clinical and radiographic evaluation of pulpectomies using three root canal filling materials: An in-vivo study
Ramar K,Mungara J
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2010,
Abstract: Various root canal filling materials are used to preserve a pulpally involved carious primary tooth. But there is no single material so far available to fulfill all the requirements of an ideal root canal filling material for a primary tooth. Hence this study was undertaken to evaluate clinically and radiographically the efficacy of three obturating materials - Calcium hydroxide with Iodoform (METAPEX), Zinc Oxide Eugenol with Iodoform (RC FILL) and Zinc Oxide Eugenol and Calcium hydroxide with Iodoform (ENDOFLAS) for a period of 9 months. Results show ENDOFLAS gave an overall success rate of 95.1%, METAPEX - 90.5% and RC FILL - 84.7%. In our study, we conclude that ENDOFLAS, a mixture of Zinc Oxide Eugenol and Calcium hydroxide with Iodoform fulfills most of the required properties of an ideal root canal filling for primary teeth.
A Rare Association of Celiac Disease with Turner Syndrome
Praveen Ramar,Shuvendu Roy
Journal of Nepal Paediatric Society , 2013, DOI: 10.3126/jnps.v33i3.7829
Abstract: Celiac Disease is an immune mediated enteropathy, with wide spectrum of extra intestinal manifestation and rare autoimmune and syndromic associations. We report one such exclusive extra intestinal manifestation of celiac disease with association of Turner syndrome. DOI: http://dx.doi.org/10.3126/jnps.v33i3.7829 ? J. Nepal Paediatr. Soc. 2013;33(3):218-219
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