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Search Results: 1 - 10 of 555644 matches for " A. K. Verma "
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International Journal of Engineering Science and Technology , 2012,
Abstract: It is known that signals obtained from the real world environment are corrupted by the noise. This noise causes poor performance of the relevant system and therefore must be removed effectively before further processing of signal. Research in the area of wavelets showed that wavelet shrinkage method performs well and efficiently as compared to other methods of denoising. In this paper, a comparative analysis of the performance of various wavelet coefficients hresholding methods presented. For thresholding of the wavelet coefficients, performance of some well-known thresholding methods i.e. Minimax, SURE (Heuristic and Rigorous) and Square-Root-Log are investigated in the presence of white Gaussian noise. The effect of wavelet decomposition levels is also investigated. For wavelet decomposition, Coif5 wavelet is used. The quality of denoised speech signal is expressed in terms of Peak Signal to Noise Ratio (PSNR) as compared to original noiseless speech signal.
Simulation and Analysis of AODV routing protocol in VANETs
Tajinder Kaur,A. K. Verma
International Journal of Soft Computing & Engineering , 2012,
Abstract: Vehicular Ad Hoc Network (VANET) is a form of Mobile Ad Hoc Networks (MANET). The field of VANETs started gaining attention in 1980s and has now been an active field of research and development. VANETs provide us with the infrastructure for developing new systems to enhance drivers’ and passengers’ safety and comfort. There are many routing protocols that have been proposed and assessed to improve the efficiency of VANET. Simulator tool has been preferred over outdoor experiment because it is simple, easy and cheap. In this paper, simulation of one of the routing protocols i.e. AODV is done on simulators which allow users to generate real world mobility models for VANET simulations. The tools used for this purpose are SUMO, MOVE and NS2. MOVE tool is built on top of SUMO which is an open source micro-traffic simulator. Output of MOVE is a real world mobility model and can be used by network simulator NS-2. Then graphs were plotted using Tracegraph for evaluation. Based on the simulation results obtained, the performance of AODV is analyzed and compared in three different node density i.e. 4, 10 and 25 nodes with respect to various parameters like Throughput, Packet size, Packet drops, End to End delay etc.
Comprehensive Analysis of Web Log Files for Mining
Vikas Verma,A. K. Verma,S. S. Bhatia
International Journal of Computer Science Issues , 2011,
Abstract: World Wide Web is a global village and rich source of information. Day by day number of web sites and its users are increasing rapidly. Information extracted from WWW may sometimes do not turn up to desired expec-tations of the user. A refined approach, referred as Web Mining, which is an area of Data Mining dealing with the extraction of interesting knowledge from the World Wide Web, can provide better result. While surfing the web sites, users interactions with web sites are recorded in web log file. These Web Logs are abundant source of information. Such logs when mined properly can provide useful information for decision making. Mining of these Web Logs is referred to as Web Log Mining. This paper analyses web log data of NASA of the month of August 1995 of 15.8MB and depicts certain behavioral aspects of users using web log mining.
A. K. Pathak ? K. S. Verma
Iranian Journal of Environmental Health Science & Engineering , 2009,
Abstract: Urban and rural vegetable markets of India characterized by mass activity with a little sanitary measure are responsible for generation of higher quantity of aerosols containing biotic and abiotic components. The aerosols generated in due course of mechanical disturbance, contain many organic compounds enable to sensitize vital respiratory organs of local inhabitants. Inhalation of airborne microorganisms can expose workers to risks from infection, toxicosis and allergy. The presence of non-spore forming gram-negative bacteria in air due to the mechanical areosolization indicates higher rate of dissemination of pollutants in these occupation associated areas. The present aero-bacteriological investigation included enumeration, identification and numerical analysis of different types of culturable airborne bacteria with inhalable fraction of gram-negative bacteria in the vegetable market of the city of Jabalpur, in order to measure the degree of aerobiopollution for this environment. The aero-bacteriological sampling has been done fortnightly for a period of one year. Samples were cultured based on standard methods. The survey revealed that in this type of atmosphere, environmental factors were responsible for the persistence of airborne bacteria with variable effects. The major contributors for aerosol generation were other mechanical activities, since this site is classified under human activity-enriched and highly trafficked site. The bioload of this atmosphere was recorded as high as 2.9 x 103 bacterial carrying particles per cubic meter during winter, dominated by both inhalable and non inhalable fractions of gram-negative bacteria. In summer, soil-borne bacteria were reported dominant in the air. High humidity and low temperature were the major factors for dissemination and distribution of gram-negative bacilli. A regression model with upto 43% variance was prepared in order to predict the bioload for this atmosphere in relation to meteorological parameters.
Impacts of Invasive Fishes on Fishery Dynamics of the Yamuna River, India  [PDF]
Atul K. Singh, Abubakar Ansari, Sharad C. Srivastava, Pankaj Verma, A. K. Pathak
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.510086

Invasion, spread and predominance of alien invasive fishes were studied in 950-km-long stretch of the Yamuna River. The fish yield ranged between 32 t/km/yr to 240 t/km/yr and the catch of alien invasive fishes dominated over local fishes in the fishery, which was over 96% at Etawah. The calculated Invasion Coefficient Index (Ixi) of alien invasive fishes was in the range of 0.12 to 0.31 indicating a major loss to the local fish diversity. The calculated Pearson’s correlation coefficient was found to have positive correlation of 0.757 and 0.710 for common carp and tilapia respectively with locally captured Indian major carps (IMC). The results of this study highlighted how unintentional spread of alien invasive fishes due to rapid aquaculture diversification and intensification has invaded into the Yamuna River causing severe loss to the local fishery. The invasion of alien fishes has been mapped for the Yamuna River at different locations using GIS tools. The results of this study invite attention on the management and sustainability of the local fishery and ecosystem health of the river.

Higher order antibunching in intermediate states
A Verma,N K Sharma,A Pathak
Physics , 2007, DOI: 10.1016/j.physleta.2008.06.045
Abstract: Since the introduction of binomial state as an intermediate state, different intermediate states have been proposed. Different nonclassical effects have also been reported in these intermediate states. But till now higher order antibunching or higher order subpoissonian photon statistics is predicted only in one type of intermediate state, namely shadowed negative binomial state. Recently we have shown the existence of higher order antibunching in some simple nonlinear optical processes to establish that higher order antibunching is not a rare phenomenon (J. Phys. B 39 (2006) 1137). To establish our earlier claim further, here we have shown that the higher order antibunching can be seen in different intermediate states, such as binomial state, reciprocal binomial state, hypergeometric state, generalized binomial state, negative binomial state and photon added coherent state. We have studied the possibility of observing the higher order subpoissonian photon statistics in different limits of intermediate states. The effect of different control parameters have also been studied in this connection and it has been shown that the depth of nonclassicality can be tuned by controlling various physical parameters.
Cutaneous Horn Overlying Lichen Simplex Chronicus
Verma Rajesh,Jaiswal A.K
Indian Journal of Dermatology , 1999,
Abstract: A 40 year old man presented with cutaneous horn overlying a lichen simplex chronicus lesion on right leg of 6 years duration.
Physiological performance under different housing system in Buffalo calves
R. K. Verma,P. Kumar and A. Adil
Veterinary World , 2008,
Abstract: A Study on physiological performance in different housing system has been evaluated. The overall values of MCH (μg) was found to be higher in control group than in treatment group but body length, heart girth and height were not found significant between the groups. [Veterinary World 2008; 1(5.000): 138-139]
Multiple dermoid cysts of omentum.
Mazumdar A,Vaiphei K,Verma G
Journal of Postgraduate Medicine , 1997,
Abstract: Dermoid cyst of the omentum is an extremely rare condition. We report a case of multiple dermoid cysts of omentum in a 50 years old woman. The aetiopathogenesis, clinical presentation and relevant literature is briefly reviewed.
Megalencephalic Leukoencephalopathy with Subcortical Cyst: A Case Report
K Gangadhar,S Patwari,A Verma,- Kaviyarasy
Nepalese Journal of Radiology , 2012, DOI: 10.3126/njr.v2i2.7691
Abstract: Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare disease first described by van der Knaap et al, in 1995. MLC is a relatively new entity of neurodegenerative disorder of autosomal recessive inheritance characterized by infantile onset macrocephaly, cerebral leucoencephalopathy, mild neurological symptoms and an extremely slow course of functional deterioration. The degree of macrocephaly is variable and can be as much as 4-6 SD above the mean. Almost all patients have seizures from an early age. Some patients have died in their 2nd and 3rd decades but few may live till fourth decade. We report a case of 5-year-old girl diagnosed to have this disease. Nepalese Journal of Radiology; Vol. 2; Issue 2; July-Dec. 2012; 76-80 DOI: http://dx.doi.org/10.3126/njr.v2i2.7691
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