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Search Results: 1 - 10 of 189901 matches for " G. Anbazhagan "
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Performance Analysis of Unified Failure Model for Emerging WiMAX Networks  [PDF]
Rajesh Anbazhagan, Nakkeeran Rangaswamy
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.32011
Abstract: In this paper, we present a failure model for WiMAX network developed by considering the collision due to contention, unavailability of bandwidth and channel error assuming them as independent events. Using this model, the performance of bandwidth request based on contention resolution with exponential increase and exponential decrease (EIED) backoff is investigated and observed low contention efficiency with high access delay. Hence, we modify the EIED mechanism by computing the backoff factor with average contention window and estimating the response time from the transmission failure. Simulations validate the developed model with modified EIED backoff and shows better performance than conventional scheme.
Optical and Electrical Conductivity Measurements of GLO Single Crystals for NLO Applications
G. Anbazhagan,P.S. Joseph,G. Shankar,T. Balakrishnan
Asian Journal of Information Technology , 2012, DOI: 10.3923/ajit.2012.36.39
Abstract: Single crystals of semi-organic material (GLO) have been grown from aqueous solution by slow evaporation techniques. The lattice parameters for the grown crystals where determined by the single crystal X-ray diffraction analysis. The presences of functional groups was estimated qualitatively by using fourier transforms infrared spectrum source that UV cut-off wavelength for the grown is at 220 nm. The optical band gap was found to be 5.6473 eV. Finally the optical conductivity and electrical conductivity studies have been carried out on this crystal.
Analyzing of Optical Band Gap in Bis Glycine Cobalt Sulfate Single Crystal
G. Anbazhagan,P.S. Joseph,G. Shankar,T. Balakrishnan
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2012.290.294
Abstract: Single crystals are Bis Glycine Cobalt Sulfate (BGCS) recently investigated nonlinear optical materials were grown by slow evaporation techniques. Optical absorption of the crystals of BGCS has been measured at room temperature from which the optical band gap has been determined using the absorption spectrum as 5.90 eV. Vibrational modes of grown crystals were conformed by FTIR spectrum. The optical absorption spectrum shows that the UV cut-off wavelength for the grown crystal is at 240 nm. The optical constant (α, K, R) were also evaluated.
Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach
K. S. Vipin, P. Anbazhagan,T. G. Sitharam
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2009,
Abstract: In this work an attempt has been made to evaluate the seismic hazard of South India (8.0° N–20° N; 72° E–88° E) based on the probabilistic seismic hazard analysis (PSHA). The earthquake data obtained from different sources were declustered to remove the dependent events. A total of 598 earthquakes of moment magnitude 4 and above were obtained from the study area after declustering, and were considered for further hazard analysis. The seismotectonic map of the study area was prepared by considering the faults, lineaments and the shear zones in the study area which are associated with earthquakes of magnitude 4 and above. For assessing the seismic hazard, the study area was divided into small grids of size 0.1°×0.1°, and the hazard parameters were calculated at the centre of each of these grid cells by considering all the seismic sources with in a radius of 300 km. Rock level peak horizontal acceleration (PHA) and spectral acceleration (SA) values at 1 s corresponding to 10% and 2% probability of exceedance in 50 years have been calculated for all the grid points. The contour maps showing the spatial variation of these values are presented here. Uniform hazard response spectrum (UHRS) at rock level for 5% damping and 10% and 2% probability of exceedance in 50 years were also developed for all the grid points. The peak ground acceleration (PGA) at surface level was calculated for the entire South India for four different site classes. These values can be used to find the PGA values at any site in South India based on site class at that location. Thus, this method can be viewed as a simplified method to evaluate the PGA values at any site in the study area.
Use of remote sensing and seismotectonic parameters for seismic hazard analysis of Bangalore
T. G. Sitharam,P. Anbazhagan,K. Ganesha Raj
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2006,
Abstract: Deterministic Seismic Hazard Analysis (DSHA) for the Bangalore, India has been carried out by considering the past earthquakes, assumed subsurface fault rupture lengths and point source synthetic ground motion model. The sources have been identified using satellite remote sensing images and seismotectonic atlas map of India and relevant field studies. Maximum Credible Earthquake (MCE) has been determined by considering the regional seismotectonic activity in about 350 km radius around Bangalore. The seismotectonic map has been prepared by considering the faults, lineaments, shear zones in the area and past moderate earthquakes of more than 470 events having the moment magnitude of 3.5 and above. In addition, 1300 number of earthquake tremors having moment magnitude of less than 3.5 has been considered for the study. Shortest distance from the Bangalore to the different sources is measured and then Peak Horizontal Acceleration (PHA) is calculated for the different sources and moment magnitude of events using regional attenuation relation for peninsular India. Based on Wells and Coppersmith (1994) relationship, subsurface fault rupture length of about 3.8% of total length of the fault shown to be matching with past earthquake events in the area. To simulate synthetic ground motions, Boore (1983, 2003) SMSIM programs have been used and the PHA for the different locations is evaluated. From the above approaches, the PHA of 0.15 g was established. This value was obtained for a maximum credible earthquake having a moment magnitude of 5.1 for a source Mandya-Channapatna-Bangalore lineament. This particular source has been identified as a vulnerable source for Bangalore. From this study, it is very clear that Bangalore area can be described as seismically moderately active region. It is also recommended that southern part of Karnataka in particular Bangalore, Mandya and Kolar, need to be upgraded from current Indian Seismic Zone II to Seismic Zone III. Acceleration time history (ground motion) has been generated using synthetic earthquake model by considering the revised regional seismotectonic parameters. The rock level PHA map for Bangalore has been prepared and these maps are useful for the purpose of seismic microzonation, ground response analysis and design of important structures.
Analyzing the Software Quality Metrics for Object Oriented Technology
S. Parthasarathy,N. Anbazhagan
Information Technology Journal , 2006,
Abstract: Metrics are units of measurement. Software engineering metrics are units of measurement that are used to characterize the software engineering products and software engineering processes. Object-oriented design and development is becoming very popular in today`s software development environment. Object-Oriented Programming Structure (OOPS) requires not only a different approach to design and implementation; it requires a different approach to software metrics. Since object oriented technology uses objects and not algorithms as its fundamental building blocks, the approach to software metrics for object-oriented programs must be different from the standard metrics set. Object-oriented analysis and design focuses on objects as the primary agents involved in a computation. This study addresses the following questions: (i) what are the concepts in object-oriented technology that affect the software quality? (ii) How the various metrics found in the literature are useful to measure the critical concepts in object-oriented technology.
Investigation on Mutual Contention Bandwidth Request Mechanisms in Two-Hop Relay Network with ITU-R Path Loss Models
Rajesh Anbazhagan,Nakkeeran Rangaswamy
ISRN Communications and Networking , 2013, DOI: 10.1155/2013/417132
Abstract: The performance of two-hop contention based bandwidth request (BR) mechanism for WiMAX relay networks is investigated under ITU-R path loss models. In conventional WiMAX systems, the mobile stations (MS) update their contention window irrespective of their transmission failures. Those systems update their contention window on collision and due to channel error or unavailability of bandwidth. Further, these failure models have been suggested for single hop networks. The failure model in two-hop systems becomes complex since it may include additional failure events such as improper detection of codes and channel error due to varying path loss. Interestingly, these failure events (collision, channel error, unavailability of bandwidth, and improper detection of codes) do not occur evenly for both hops of a link. Hence, to set the contention window effectively, unique failure models are developed by considering the characteristics of BR mechanism and hop at which the BR is performed. In the proposed system, the two-hop BR is carried out with all combinations of message and code bandwidth request schemes. Among them, the message-code BR mechanism performs better under suburban fixed and outdoor to indoor or pedestrian environment, and code-code BR scheme performs better for vehicular environment. 1. Introduction Broadband wireless technologies with worldwide interoperability for microwave access (WiMAX) networks are gaining tremendous attention due to the increasing consumer demands. WiMAX is envisioned to provide high-speed data rate to last mile and last inch customers. In recent years, mobile WiMAX has emerged to support high-speed data rate to customers at vehicular speed. The IEEE 802.16j task group has been formed to extend the scope of single hop WiMAX network (IEEE 802.16e) in terms of capacity (throughput) and coverage [1]. In WiMAX relay network, the stations of interest are base station (BS), relay station (RS), and mobile station (MS). Based on the number of hops between BS and MS, the WiMAX networks may be classified into two types, namely, single hop network and multihop network. Further, the architecture modes supported by the WiMAX standard are as follows: point-to-point (PP), point-to-multipoint (PMP), and mesh modes. In a single hop network, the MS communicate directly with the BS, and hence the network follows PP (between BSs) or PMP architecture [2, 3]. In multihop network, the MS may not be in a position to communicate directly with the BS and involve multiple hops to establish the connectivity. One or more RS are involved to establish
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Data clustering is the process of dividing data elements into classes or clusters so that items in the same class are as similar as possible, and items in different classes are as dissimilar as possible. Clustering is used in many areas, including artificial intelligence, biology, customer relationship management, data compression, data mining information retrieval, image processing, machine learning marketing, medicine, pattern recognition, psychology and statistics. This paper gives survey of various types of clustering algorithms. It describes its functionality, parameters needed and the time and space complexity required for clustering
Molecular characterisation and nucleotide sequence analysis of canine parvovirus strains in vaccines in India
Sukdeb Nandi,Rajendra Anbazhagan,Manoj Kumar
Veterinaria Italiana , 2010,
Abstract: Canine parvovirus 2 (CPV 2) is one of the most important viruses that causes haemorrhagic gastroenteritis and myocarditis of dogs worldwide. The picture has been complicated further due to the emergence of new mutants of CPV, namely: CPV 2a, CPV 2b and CPV 2c. In this study, the molecular characterisation of strains present in the CPV vaccines available on the Indian market was performed using polymerase chain reaction and DNA sequencing. The VP1/VP2 genes of two vaccine strains and a field strain (Bhopal) were sequenced and the nucleotide and the deduced amino acid sequences were compared. The results indicated that the isolate belonged to CPV type 2b and the strains in the vaccines belonged to type CPV 2. From the study, it is inferred that the CPV strain used in commercially available vaccine preparation differed from the strains present in CPV infection in dogs in India
Seroprevalence of HCV and its co-infection with HBV and HIV among liver disease patients of South Tamil Nadu
Ganesh Kumar Anbazhagan, Sridharan Krishnamoorthy, Thirunalasundari Thiyagarajan
World Journal of Hepatology , 2010,
Abstract: AIM: To determine the seroprevalence of hepatitis C virus (HCV) and its co-infection with hepatitis B virus (HBV), hepatitis delta agent (HDV) and human immunodeficiency virus (HIV) among liver disease patients of south Tamil Nadu.METHODS: A total of 1012 samples comprising 512 clinically diagnosed cases of liver disease patients and 500 apparently healthy age and sex matched individuals were screened for Hepatitis C virus (anti HCV and HCV RNA), Hepatitis B virus (HBsAg), Hepatitis delta agent (anti HDV) and Human immuno virus (antibodies to HIV-1 and HIV-2) using commercially available enzyme linked immunosorbent assay kits. HCV RNA was detected by RT-PCR. Liver function tests like ALT, AST, GGT, ALP, bilirubin and albumin were also studied.RESULTS: The seroprevalence of HCV was found to be 5.6% among liver disease patients by ELISA. 27/512, 49/512 and 12/512 patients were positive for HIV, HBV & HDV respectively. Co-infection of HCV & HBV was found in 8 patients, with 6 for HCV & HIV and 4 for HCV, HBV & HIV co-infections. Sex-wise analysis showed that HIV, HCV & HBV and HCV & HIV co-infection was high among females whereas for HBV it was high in males. The mean ALT and AST in HCV positive cases were 42.1 ± 8.3 and 49 ± 10.1. In people co-infected with HCV & HBV or HCV & HIV or HCV, HBV & HIV the mean ALT of 58.0 ± 03.16, 56.78 ± 4.401 and 64.37 ± 4.01 respectively.CONCLUSION: We strongly recommend routine test of the blood for HCV in addition to HBV and HIV. We also recommend individualized counseling to identify those at risk and testing for those who want it. Improved surveillance and periodic epidemiological studies will have to be undertaken to monitor and prevent these blood-borne viruses.
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