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Search Results: 1 - 10 of 117916 matches for " Vignesh T "
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Outcome in patients with blunt chest trauma and pulmonary contusions
Vignesh T,Arun Kumar A,Kamat V
Indian Journal of Critical Care Medicine , 2004,
Abstract: ABSTRACT: Severe pulmonary contusions occur in blunt chest trauma, especially with high velocity injuries. Pulmonary contusions following trauma may result in significant hypoxemia and decreased compliance which may progress over several days. Extensive contusions may result in respiratory difficulty or progress to adult respiratory distress syndrome, which increases mortality. We decided to review the cases of polytrauma with associated pulmonary contusions to determine the factors which influence outcome. MATERIALS AND METHODS: A retrospective chart review of all cases of trauma with pulmonary contusions on X-ray or CT scan. The cases were examined for age, type of injuries, admission APACHE II, SAPS II and SOFA scores, PaO2/FiO2 ratio, presence or absence of rib fractures, average positive fluid balance, average sedation dose, pulmonary haemorrhage, ventilator days, ICU days and hospital outcome. RESULTS: There were 18 cases of pulmonary contusions. All had associated injuries. 6 patients died, 4 in the ICU and 2 patients died 1 week after transfer to a high dependency unit, one due to sepsis and the other due to massive haemothorax. There was a significant difference in PaO2/FiO2 ratio at admission and throughout the ICU course, fluid balance and sedation dose, but not in ventilator days and ICU days between survivors and nonsurvivors. The incidence, frequency and amount of pulmonary haemorrhage were higher in the nonsurvivors. CONCLUSIONS: Close attention to improving gas exchange, and early management of hemoptysis might improve outcome in pulmonary contusions
Analyzed Virtual Routing Protocol for Future Networks (MANET & topological network)
R. Viswanathan,J. Vignesh Kumar,T. V. Krishna Prasad
International Journal of Distributed and Parallel Systems , 2012,
Abstract: The mobile ad-hoc network (MANET) is a wireless unstructured network and this has mostly suggested for multimedia streaming efficiency. The hackers attacks are reduce the capacity and efficiency of network in MANET. There are various types of protocol are used for the communication in MANET, but security is lacking in those techniques and some insoluble problems present in MANET. In this paper exhibits, a layered protocol network for secured data transmission called Analyzed Virtual Routing Protocol (AVRP). This protocol used to provide more secured data transmission and this not disturbing data streaming in the network.
Non-Negative Matrix Factorization Based UKF Algorithm for Constant Modulus Signals in Adaptive Beamforming  [PDF]
Ranganathan Vignesh, K. A. Narayanankutty
Open Journal of Antennas and Propagation (OJAPr) , 2016, DOI: 10.4236/ojapr.2016.43009
Abstract: Blind adaptive beamforming is getting appreciated for its various applications in contemporary communication systems where sources are statistically dependent or independent that are allowed to formulate new algorithms. Qualitative performance and time complexity are the main issues. In this paper, we propose a technique for constant modulus signals applying basic non-negative matrix factorization (BNMF) in blind adaptive beamforming environment. We compared the existing Unscented Kalman Filter based Constant Modulus Algorithm (UKF-CMA) with proposed NMF-UKF-CMA algorithm. We see there is a better improvement of sensor array gain, signal to interference plus noise ratio (SINR) and mean squared deviation (MSD) as the noise variance and the array size increase with reduced computational complexity with the UKF-CMA.
EXPERIMENTAL ANALYSIS AND MODELLING OF A FOUR STROKE SINGLE CYLINDER DI DIESEL ENGINE UNDER VARIABLE COMPRESSION RATIO
T.P.BALAJI VIGNESH,C.BALAMURUGAN,N. VINAYAGAM,T.GAVASKAR
International Journal of Engineering Science and Technology , 2012,
Abstract: The study targets at finding the effects of Engine Design parameter (Compression ratio) on the Performance with regard to Brake Specific Fuel Consumption and brake thermal efficiency, Combustion parameter viz. Cylinder pressure, Hear Release rate (HRR), Rate of Pressure Rise (RPR) and emission of CO, CO2, HC , NOx with diesel as a fuel. The Study was carried out at different compression ratios (14-17) to find the optimum value at which lesser emissions and better performance and combustion characteristics are obtained. It was found that as the compression ratio is increased the Brake thermal efficiency and brake power increases and brake specific fuel consumption is slightly reduced. The combustion parameters CP, HRR, RPR all increase with increase with increase in compression ratio. The Emission of CO2 and NOx increases steeply at high compression ratio. A combustion Model of the engine is created in StarCD software and the experimental and the theoretical Cylinder pressure values are validated.
Is Distal Femur Locking Plate a Superior Implant in Distal Femur Fracture?  [PDF]
Anil Chander, Ganesan Ram Ganesan, Vignesh Jayabalan
Open Journal of Orthopedics (OJO) , 2015, DOI: 10.4236/ojo.2015.59035
Abstract: In spite of advances in techniques and improvements in surgical implants, confusion still prevails regarding use of specific implants in distal femur fracture. Fractures in the distal femur have posed considerable therapeutic challenges throughout the history of fracture treatment. Most of these surgical failures were due to inadequate fixation of the fracture fragments. The Aim of the study is to determine whether distal femur locking plates are superior implants than dynamic condylar screw and distal femur nail. A prospective and observational study was done in Department of Orthopaedics and Traumatology, Sri Ramachandra Medical Collage, Chennai between Jan. 2011 and Jan. 2015. Patients with distal femoral fractures, admitted into the hospital, were treated using various modes of internal fixation and followed up over a period of six months to one year and their functional outcome was evaluated. The functional and radiological assessment of patients during follow-up was done using Neer’s criteria. The use of any one of the implant, i.e. distal femur locking plates, dynamic condylar screw or distal femur nailing for internal fixation, depends on the type of fracture and the pre operative planning and intra operate decision of the surgeon. In our study, 38% of fractures treated by Dynamic condylar screw, 72% of fractures treated by distal femur locking plate and 42% of fractures treated by Distal femur supracondylar nail had excellent/satisfactory results. Locking plates had better outcome in both extra-articular and intra-articular group. They also had better outcome in both younger and older age groups.
Classification of Anti-HIV Compounds using QSAR Studies
Vignesh,Arnold Emerson I
Research in Biotechnology , 2011,
Abstract: The Acquired Immunodeficiency Syndrome (AIDS) is one the most fatal disorders forwhich there have been no complete or successful chemotherapy yet. The pandemic spread ofthis disease has prompted an unprecedented scientific clinical effort to understand andpropagate ways to combat it. Quantitative Structure–Activity Relationship (QSAR) study hasbeen reportedly used to study topological indices, physiochemical and indicator parameterson a series of HEPT analogues for understanding HIV reverse transcriptase inhibitor activity(Shovanlal Gayen et al, 2004). The aim of their study was to correlate the identified molecularsurface properties with the inhibitory activity of HIV-1 RT using QSAR. The dockingenergies were used to categorize anti-HIV compounds as classified and non classifiedmultiple linear regression models. Results indicate that classified MLR had a betterpredictability than the non classified models. Thus this method of classification proves to bea good predictability model.
Polycystic ovary syndrome: A component of metabolic syndrome?
Vignesh J,Mohan V
Journal of Postgraduate Medicine , 2007,
Abstract: In 1935, Stein and Leventhal first described the polycystic ovary (PCO) as a frequent cause of irregular ovulation in women seeking treatment for subfertility. Although the initial management was surgical with wedge resection of ovary, the availability of radioimmunoassay and increased clinical use of ultrasound made it clear that many women had the ultrasound characteristics of PCO with or without the biochemical or clinical features of PCOS and therefore that PCO were not associated with a single syndrome. The association between increased insulin resistance and PCOS is a consistent finding in all ethnic groups. Obesity is a common factor in the majority of women with PCOS. It is postulated that a woman may be genetically predisposed to developing PCOS but it is only the interaction of environmental factors (obesity) with the genetic factors that results in the characteristic metabolic and menstrual disturbances. Weight loss, altered diet and exercise have been shown to be effective in the management of PCOS. Importance of early recognition, proper intervention, long-term monitoring and health implications needs more concern.
AN OPTIMAL ROUTE DETERMINING METHODOLOGY BASED ON DECISION SUPPORT SYSTEM
H. Vignesh Ramamoorthy
Journal of Global Research in Computer Science , 2013,
Abstract: Searching an optimal solution for route finding is one of the major functions in GIS. It also provides a strong decision support for finding the optimal route for specified rural area. Here GIS which is referred as data warehouse in which abundant resource are available. This paper mainly analyses the strategies of the specified area, and identifies the problems in routing. Thus provides the solution for making the feasible path from source to destination with the help of routing graph at given time interval. The aim of this paper is to provide an optimal route map for the transport department. Keywords: GIS, Data Warehouse, Routing, Optimal.
Low SNR Capacity of Fading Channels with Peak and Average Power Constraints
Vignesh Sethuraman,Bruce Hajek
Mathematics , 2006,
Abstract: Flat-fading channels that are correlated in time are considered under peak and average power constraints. For discrete-time channels, a new upper bound on the capacity per unit time is derived. A low SNR analysis of a full-scattering vector channel is used to derive a complimentary lower bound. Together, these bounds allow us to identify the exact scaling of channel capacity for a fixed peak to average ratio, as the average power converges to zero. The upper bound is also asymptotically tight as the average power converges to zero for a fixed peak power. For a continuous time infinite bandwidth channel, Viterbi identified the capacity for M-FSK modulation. Recently, Zhang and Laneman showed that the capacity can be achieved with non-bursty signaling (QPSK). An additional contribution of this paper is to obtain similar results under peak and average power constraints.
Comments on `Bit Interleaved Coded Modulation'
Vignesh Sethuraman,Bruce Hajek
Mathematics , 2005,
Abstract: Caire, Taricco and Biglieri presented a detailed analysis of bit interleaved coded modulation, a simple and popular technique used to improve system performance, especially in the context of fading channels. They derived an upper bound to the probability of error, called the expurgated bound. In this correspondence, the proof of the expurgated bound is shown to be flawed. A new upper bound is also derived. It is not known whether the original expurgated bound is valid for the important special case of square QAM with Gray labeling, but the new bound is very close to, and slightly tighter than, the original bound for a numerical example.
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