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Search Results: 1 - 10 of 338 matches for " Seethalakshmi Ramanathan "
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Residual Negative Symptoms Differentiate Cognitive Performance in Clinically Stable Patients with Schizophrenia and Bipolar Disorder
Rajeev Krishnadas,Seethalakshmi Ramanathan,Eugene Wong,Ajita Nayak,Brian Moore
Schizophrenia Research and Treatment , 2014, DOI: 10.1155/2014/785310
Abstract: Cognitive deficits in various domains have been shown in patients with bipolar disorder and schizophrenia. The purpose of the present study was to examine if residual psychopathology explained the difference in cognitive function between clinically stable patients with schizophrenia and bipolar disorder. We compared the performance on tests of attention, visual and verbal memory, and executive function of 25 patients with schizophrenia in remission and 25 euthymic bipolar disorder patients with that of 25 healthy controls. Mediation analysis was used to see if residual psychopathology could explain the difference in cognitive function between the patient groups. Both patient groups performed significantly worse than healthy controls on most cognitive tests. Patients with bipolar disorder displayed cognitive deficits that were milder but qualitatively similar to those of patients with schizophrenia. Residual negative symptoms mediated the difference in performance on cognitive tests between the two groups. Neither residual general psychotic symptoms nor greater antipsychotic doses explained this relationship. The shared variance explained by the residual negative and cognitive deficits that the difference between patient groups may be explained by greater frontal cortical neurophysiological deficits in patients with schizophrenia, compared to bipolar disorder. Further longitudinal work may provide insight into pathophysiological mechanisms that underlie these deficits. 1. Introduction Cognitive deficits represent stable traits in both schizophrenia and bipolar disorder [1]. Studies that have directly compared the two groups show qualitatively similar deficits, but quantitatively, milder deficits in bipolar disorder [2–4]. More recently, it has been postulated that this quantitative difference may depend on the presence or severity of psychotic symptoms [5, 6]. For example, Simonsen et al. found that as compared to those without psychosis, subjects with a history of psychosis, irrespective of the diagnosis, showed poorer performance on neurocognitive measures [5]. Additionally, depressive and negative symptoms have also been associated with cognitive deficits [7, 8]. However, very few studies have tried to address these issues during symptomatic remission. It is not clear if residual/subthreshold psychopathology during periods of remission would explain the trait difference between the two groups. In other words, do patients with schizophrenia perform poorer on cognitive tests than patients with bipolar disorder, due to the presence of
Routing Strategy Selection for Zigbee Mesh Networks  [PDF]
Ramanathan Karthikeyan
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.37081
Abstract: Based on IEEE 802.15.4 Low Rate-Wireless Personal Area Network (LR-WPAN) standard, the Zigbee standard has been proposed to interconnect simple, low rate and battery powered wireless devices. The deployment of Zigbee network is expected to facilitate numerous applications such as Home-appliance networks, home healthcare, medical monitoring and environmental sensors. An effective routing scheme is more important for Zigbee mesh networks. In order to achieve effective routing in Zigbee Mesh networks, a Zigbee protocol module is realized using NS-2. The suitable routing for different data services in the Zigbee application layer and a best routing strategy for Zigbee mesh network are proposed. The simulation shows the selection of suitable routing for continuous data services and for bursting data services in the Zigbee application layer and the comparison of three routing strategies namely ERD (All packets Enable Route Discovery), SRD (All packets Suppress Route Discovery) and BOS (routing Based on Data Services) in the aspects of Efficiency and Overhead.
Assessment of Methane Flux from Municipal Solid Waste (MSW) Landfill Areas of Delhi, India  [PDF]
Manju Rawat, AL Ramanathan
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.24045
Abstract: Carbon dioxide, methane and nitrous oxide are the major Greenhouse Gases (GHG’s), which emit from landfill areas and contribute significantly to global warming. Moreover, that the global warming potential of methane is 21 times higher than that of carbon dioxide and it has highest generation (60%) than other gases. Therefore, there is immense concern for its abatement or utilization from landfill areas. Compared to the west, the composition of municipal solid waste (MSW) in developing countries has higher (40% - 60%) organic waste. This would have potential to emit higher GHG’s from per ton of MSW compared to developed world. Beside that landfills areas in India are not planned or en- gineered generally low lying open areas, where MSW is indiscriminate disposed. This leads to uncontrolled emission of trace gases, foul smell, bird menace, ground and surface water pollution etc. Due to scarcity of land in big cities, mu- nicipal authorities are using same landfill for nearly 10 - 20 years. Hence, the possibility of anaerobic emission of GHG’s further increases. In the present paper we had quantified the methane emission from three MSW landfill areas of Delhi i.e., Gazipur, Bhalswa and Okhla. The results showed that the range of methane emission various in winter from 12.94 to 58.41 and in Summer from 82.69 - 293 mg/m2/h in these landfill areas. The paper has also reviewed the literature on methane emission from India and the status of landfill areas in India.
Deformation Stability of Al 7075/20%SiCp (63 μm) Composites during Hot Compression  [PDF]
M. Rajamuthamilselvan, S. Ramanathan
Geomaterials (GM) , 2012, DOI: 10.4236/gm.2012.24017
Abstract: In Stir cast Al 7075/20%SiCp composites were subjected to compression testing at strain rates and temperatures ranging from 0.001 to 1.0 s–1 and from 300°C to 500°C respectively. And the associated microstructural transformations and instability phenomena were studied by observations of the optical electron microscope. The power dissipation efficiency and instability parameter were calculated following the dynamic material model and plotted with the temperature and logarithm of strain rate to obtain processing maps for strains of 0.5. The processing maps present the instability zones at higher strain rates. The result shows that with increasing strain, the instability zones enlarge. The microstructural examination shows that the interface separates even the particle cracks or aligns along the shear direction of the adiabatic shear band in the instability zones. The domain of higher efficiencies corresponds to dynamic recrystallization during the hot deformation. Using the processing maps, the optimum processing parameters of stain rates and temperatures can be chosen for effective hot deformation of Al 7075/20%SiCp composites.
Emerging Asia’s Version of the Mundell-Fleming Model  [PDF]
Suresh Ramanathan, Kian Teng
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.49064
Abstract:

This paper explains the Mundell-Fleming model in the context of Emerging Asia economies management of capital mobility. Central Banks and Financial Regulators in Emerging Asia adopt a modified version of the model that incorporates two vital levers, a policy driven and a market driven method that is adaptable to the magnitude of capital flow. A policy combination mix of both policy and market driven provides smooth monetary policy signal transmission to exchange rates.

A DFT Calculation of Nb and Ta (001) Surface Properties  [PDF]
Amall Ahmed Ramanathan
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.43A060
Abstract:
First principle calculations are performed using the super cell method with pseudopotentials and plane waves based on the Density Functional Theory (DFT) for the surface structural properties at T = 0 K. Thin slabs of 7 - 13 atomic layers of the clean Nb and Ta (001) surfaces are considered and relaxations, surface energies, and work functions of the fully relaxed slabs are presented. Consistent results are obtained with the Generalized Gradient Approximation (GGA) and the Local Density Approximation (LDA) for the exchange-correlation functional and they compare well with experimental and other theoretical works.
Theoretical Analysis of Immobilized Oxidase Enzyme Electrode in the Presence of Two Oxidants  [PDF]
Malinidevi Ramanathan, Rajendran Lakshmanan
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.710062
Abstract: In this paper, mathematical model of Martens and Hall (Analytical chemistry 66, 2763-2770 (1994)) for an immobilized oxidase enzyme electrode is discussed. The model involves the system of non-linear reaction diffusion equations under the steady state conditions. A simple and closed-form of approximate analytical expressions for the concentrations of the immobilization of three enzyme substrates has been derived by solving the system of non-linear reaction diffusion equations using new approach of homotopy perturbation method. Approximate polynomial expression of concentration of substrate, oxygen and oxidized mediator and current was obtained in terms of the Thiele moduli and the small values of parameters Bs, Bo and Bm (normalized surface concentration of substrate, oxygen and oxidized mediator). Furthermore, in this work the numerical simulation of the problem is also reported using Matlab program. An agreement between analytical expressions and numerical results is noted.
HYPOPLASIA OF ALL PARANASAL SINUSES A CASE SERIES AND LITERATURE REVIEW
Balasubramanian Thiagarajan,Seethalakshmi Narasiman
Otolaryngology Online Journal , 2012,
Abstract: Hypoplasia of maxillary sinus is a rather rare condition. Review of literature reveal that so far only 6 cases have been reported. Hypoplasia of frontal and sphenoid sinuses has beendocumented rather frequently. In this article the authors report two rare cases of hypoplasia involving all paranasal sinuses which has not been reported so far in literature. This is actuallyan incidental finding when routine CT scan of sinuses was performed. This patient was clinically asymptomatic. Awareness of this condition is important because of implications involved in performing FESS surgery in these patients. Routine x-rays will lead to erroneousdiagnosis of sinus infection because of the opacity seen in the poorly developed sinus area.
A Frame work for improvising Service of Multimedia Applications in Mobile Networks
Bhuvaneswari Mariappan,Seethalakshmi Pandian
International Journal of Multimedia & Its Applications , 2011,
Abstract: The main objective of this paper is to propose a frame work for improvising the service of multimedia applications in mobile networks. The framework has been proposed with a Cross-Layer Manager (CLM) and a Cross-Layer Coordinator (CLC) for improvising of multimedia applications by dynamically adapting the bandwidth under prevailing channel conditions. Cross-Layer coordination among Application, MAC and Physical layer has been achieved along with bandwidth adaptation that improvises the Quality of Experience (QoE) of multimedia applications. The performance of the framework has been tested using GloMoSim and the results for the proposed framework under different scenarios show an improvement of 16% in throughput. It is also observed that our framework provides 5% improvement in multimedia service when compared with the cellular system containing only homogeneous traffic calls.
Classifier in Age classification
B. Santhi,R. Seethalakshmi
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Face is the important feature of the human beings. We can derive various properties of a human by analyzing the face. The objective of the study is to design a classifier for age using facial images. Age classification is essential in many applications like crime detection, employment and face detection. The proposed algorithm contains four phases: preprocessing, feature extraction, feature selection and classification. The classification employs two class labels namely child and Old. This study addresses the limitations in the existing classifiers, as it uses the Grey Level Co-occurrence Matrix (GLCM) for feature extraction and Support Vector Machine (SVM) for classification. This improves the accuracy of the classification as it outperforms the existing methods.
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