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Search Results: 1 - 10 of 146514 matches for " Rajesh K. Sharma "
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International Journal of Engineering Science and Technology , 2011,
Abstract: The primary objective of the paper is to identify the performance measurement indicator for best supplier and secondly to develop an appropriate Fuzzy-AHP model for evaluating the suppliers. Fuzzy-AHP is an efficient tool to handle the fuzziness of the data involved in deciding the preferences of different decision variables. Thelinguistic level of comparisons produced by the customers and experts for each comparison are tapped in the form triangular fuzzy numbers to construct fuzzy pair-wise comparison matrices. An elaborate computer program is also included for quick response of the respondents.
Joint Source-Channel Coding on a Multiple Access Channel with Side Information
R. Rajesh,Vinod Sharma,V. K. Varshenya
Mathematics , 2009,
Abstract: We consider the problem of transmission of several distributed correlated sources over a multiple access channel (MAC) with side information at the sources and the decoder. Source-channel separation does not hold for this channel. Sufficient conditions are provided for transmission of sources with a given distortion. The source and/or the channel could have continuous alphabets (thus Gaussian sources and Gaussian MACs are special cases). Various previous results are obtained as special cases. We also provide several good joint source-channel coding schemes for discrete sources and discrete/continuous alphabet channel.
Capacity of Gaussian MAC Powered by Energy Harvesters without Storage Buffer
R Rajesh,Deekshith P K,Vinod Sharma
Mathematics , 2012,
Abstract: We consider a Gaussian multiple access channel (GMAC) where the users are sensor nodes powered by energy harvesters. The energy harvester has no buffer to store the harvested energy and hence the energy need to be expended immediately. We assume that the decoder has perfect knowledge of the energy harvesting process. We characterize the capacity region of such a GMAC. We also provide the capacity region when one of the users has infinite buffer to store the energy harvested. Next we find the achievable rates when the energy harvesting information is not available at the decoder.
AWGN Channel Capacity of Energy Harvesting Transmitters with a Finite Energy Buffer
Deekshith P K,Vinod Sharma,R Rajesh
Computer Science , 2013,
Abstract: We consider an AWGN channel with a transmitter powered by an energy harvesting source. The node is equipped with a finite energy buffer. Such a system can be modelled as a channel with side information (about energy in the energy buffer) causally known at the transmitter. The receiver may or may not have the side information. We prove that Markov energy management policies are sufficient to achieve the capacity of the system and provide a single letter characterization for the capacity. The computation of the capacity is expensive. Therefore, we discuss an achievable scheme that is easy to compute. This achievable rate converges to the infinite buffer capacity as the buffer length increases.
Improved estimator of finite population mean using auxiliary attribute in stratified random sampling
Hemant K. Verma,Prayas Sharma,Rajesh Singh
Statistics , 2014,
Abstract: The present study discuss the problem of estimating the finite population mean using auxiliary attribute in stratified random sampling. In this paper taking the advantage of point bi-serial correlation between the study variable and auxiliary attribute, we have improved the estimation of population mean in stratified random sampling. The expressions for Bias and Mean square error have been derived under stratified random sampling. In addition, an empirical study has been carried out to examine the merits of the proposed estimator over the existing estimators.
Generalized class of estimators for finite population mean when study variable is qualitative in nature
Prayas Sharma,Hemant K. Verma,Rajesh Singh
Statistics , 2014,
Abstract: This paper suggests a generalized class of estimators for population mean of the qualitative study variable in simple random sampling using information on an auxiliary variable. Asymptotic expressions of bias and mean square error of the proposed class of estimators have been obtained. Asymptotic optimum estimator has been investigated along with its approximate mean square error. It has been shown that proposed generalized class of estimators are more efficient than all the estimators considered by Singh et al. (2010) in case of qualitative study variable. In addition theoretical findings are supported by an empirical study based on real population to show the superiority of the constructed estimators over others.
Reliability Analysis of A System Using Intuitionstic Fuzzy Sets
M.K.Sharma,Vintesh Sharma,Rajesh Dangwal
International Journal of Soft Computing & Engineering , 2012,
Abstract: In General fuzzy sets are used to analyze the system Reliability. Present paper attempts to review the fuzzy/possibility tools when dealing with reliability of series-parallel network systems. Various issues of reasoning-based approaches in this framework are reviewed, discussed and compared with the standard approaches of reliability. To analyze the fuzzy system reliability, the reliability of each component of the system is considered as a trapezoidal intuitionstic fuzzy number. Trapezoidal intuitionstic fuzzy number arithmetic operations are also performed to evaluate the fuzzy reliability of the system. A numerical example is also given to illustrate the method.
Clinico-Histopathological Correlation in Leprosy
Anuja Sharma,Rajesh Kumar Sharma,K C Goswsami,Subash Bardwaj
JK Science : Journal of Medical Education & Research , 2008,
Abstract: Clinical diagnosis of early leprosy lesions poses difficulties. The present study was carried to correlatehistological diagnosis of skin biopsies of untreated leprosy cases with clinical diagnosis using Ridley-Jopling classification. 270 skin biopsies of untreated leprosy cases over a period of two years were included .Paraffin sections of biopsies were stained with Hematoxylin & Eosin, Ziehl-Neelsen’s & Fite’s stains,examined and classified histopathologically according to Ridley- Jopling scale and then correlated withclinical diagnosis. Overall concordance of clinical and histopathological diagnosis was seen in 53.44%cases with maximum parity in lepromatous leprosy (75.86%), followed by borderline lepromatous (58.82%),borderline tuberculoid (53.01%), tuberculoid (47.37%), and least in mid-borderline cases (37.35%).Indeterminate leprosy cases showed 100% clinicopathological concordance. There was minor disagreement(difference of one group) in 29.56% and major disagreement (difference of two or more groups) in 17%cases. We noted minor disagreement in polar leprosy (TT+LL) and major discordance in borderline group(BT+BB+BL). Cases in borderline group are in continuously changing immunological spectrum andhistological classification because of its definitve features gives a better indication than clinical classificationfor any recent shift of a case in the spectrum. Skin biopsy may be studied in all cases of leprosy for betterdiagnosis
View Creation for Queriesin Object Oriented Databases
Rajesh Narang,KD Sharma,
Rajesh Narang
,K.D. Sharma

计算机科学技术学报 , 1999,
Abstract: A view in object oriented databases corresponds to virtual schemawith restructured generalization and decomposition hierarchies. Numbers of viewcreation methodologies have been proposed. A major drawback of existing method-ologies is that they do not maintain the closure property. That is, the result of aquery does not have the same semantics as embodied in the object oriented datamodel. Therefore, this paper presents a view creation methodology that derives aclass in response to a user's query, integrates derived class in global schema (i.e.,considers the problem of classes moving in class hierarchy) and selects the requiredclasses from global schema to create the view for user's query. Novel idea of viewcreation includes: (a) an object algebra for class derivation and customization (wherethe derived classes in terms of object instances and procedure/methods are studied),(b) maintenance of closure property, and (c) classification algorithm which providesmechanism to deal with the problem of a class moving in a class hierarchy.
Limitations in assessing nerve growth factor levels in aqueous humor samples from human eyes
Kakarla V Chalam, Rajesh K Sharma, Ravi K Murthy
BMC Research Notes , 2008, DOI: 10.1186/1756-0500-1-22
Abstract: In this study, we examined the presence of NGF levels in aqueous humor collected from human eyes and the limitations in determining the NGF levels in human samples. NGF was assessed by ELISA immunoassay in undiluted aqueous samples collected from 32 consecutive patients undergoing surgery for cataract (control) or primary open angle glaucoma (POAG). Recombinant NGF was used as positive control. NGF levels were below undetectable levels in aqueous humor from eyes with POAG and controls by immunoassay. Less than 10% of samples had detectable NGF levels and these were considered outliers.Our result highlights the undetectable levels of NGF in human aqueous samples.Aqueous occupies the anterior and posterior chambers of the eye and nourishes the lens and the corneal endothelium. The aqueous composition resembles that of plasma, but contains much less proteins and glucose. It has higher levels of lactic and ascorbic acids. A number of studies have implicated nerve growth factor (NGF) in pathophysiology of glaucoma [1-3]. NGF receptors have been demonstrated on human trabecular meshwork [2,4] make it interesting to investigate changes in NGF levels in aqueous samples from patients. In this study we evaluated the feasibility of measuring NGF levels in aqueous samples using a commonly used ELISA kit.The study was approved by the Institutional Review Board, University of Florida, Jacksonville. An informed consent was obtained from all the patients included in the study. Aqueous samples were collected from 32 consecutive patients undergoing surgery for cataract (control) or primary open angle glaucoma (POAG). At the time of surgery, after preparing the eye, undiluted aqueous sample was collected from the anterior chamber by a 27 gauge insulin syringe. Samples were immediately frozen at -80°C and thawed immediately before assay. 18 patients had POAG and 14 patients had cataract.Most frequent sample size that could practically be collected (mode) was 50 μL of aqueous. ELISA imm
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