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Search Results: 1 - 10 of 375023 matches for " P. C. Jha "
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A Fuzzy Approach for Component Selection amongst Different Versions of Alternatives for a Fault Tolerant Modular Software System under Recovery Block Scheme Incorporating Build-or-Buy Strategy  [PDF]
P. C. Jha, Ritu Arora, U. Dinesh Kumar
American Journal of Operations Research (AJOR) , 2011, DOI: 10.4236/ajor.2011.14029
Abstract: Software projects generally have to deal with producing and managing large and complex software products. As the functionality of computer operations become more essential and yet more critical, there is a great need for the development of modular software system. Component-Based Software Engineering concerned with composing, selecting and designing components to satisfy a set of requirements while minimizing cost and maximizing reliability of the software system. This paper discusses the fuzzy approach for component selection using “Build-or-Buy” strategy in designing a software structure. We introduce a framework that helps developers to decide whether to buy or build components. In case a commercial off-the-shelf (COTS) component is selected then different versions are available for each alternative of a module and only one version will be selected. If a component is an in-house built component, then the alternative of a module is selected. Numerical illustrations are provided to demonstrate the model developed.
Optimal Testing Effort Control for Modular Software System Incorporating The Concept of Independent and Dependent Faults: A Control Theoretic Approach
International Journal of Optimization and Control : Theories & Applications , 2012,
Abstract: In this paper, we discuss modular software system for Software Reliability GrowthModels using testing effort and study the optimal testing effort intensity for each module. The maingoal is to minimize the cost of software development when budget constraint on testing expenditureis given. We discuss the evolution of faults removal dynamics in incorporating the idea of leading/independent and dependent faults in modular software system under the assumption that testing ofeach of the modulus is done independently. The problem is formulated as an optimal controlproblem and the solution to the proposed problem has been obtained by using Pontryagin MaximumPrinciple.
Fuzzy Approach for Selecting Optimal COTS Based Software Products Under Consensus Recovery Block Scheme
P. C. Jha,Shivani Bali,P. K. Kapur
BVICAM's International Journal of Information Technology , 2011,
Abstract: The cost associated with development of a large and complex software system is formidable. In today's customer driven market, improvement of quality aspects in terms of reliability of the product is also gaining increased importance. But the resources are limited and the manager has to maneuver within a tight schedule. In order to meet these challenges, many organizations are making use of Commercial Off-The-Shelf (COTS) software. This paper develops a fuzzy multi objective optimization model approach for selecting the optimal COTS software product among alternatives for each module in the development of modular software system. The problem is formulated for consensus recovery block fault tolerant scheme. In today’s ever changing environment, it is arduous to estimate the precise cost and reliability of software. Therefore, we develop a fuzzy multi objective optimization models for selecting optimal COTS software products. Numerical illustrations are provided to demonstrate the models developed.
Reliability growth modeling and optimal release policy under fuzzy environment of an N-version programming system incorporating the effect of fault removal efficiency
Reliability Growth Modeling and Optimal Release Policy Under Fuzzy Environment of an N-version Programming System Incorporating the Effect of Fault Removal Efficiency

P K Kapur,Anshu Gupta,P C Jha,

国际自动化与计算杂志 , 2007,
Abstract: Failure of a safety critical system can lead to big losses.Very high software reliability is required for automating the working of systems such as aircraft controller and nuclear reactor controller software systems.Fault-tolerant softwares are used to increase the overall reliability of software systems.Fault tolerance is achieved using the fault-tolerant schemes such as fault recovery (recovery block scheme),fault masking (N-version programming (NVP)) or a combination of both (Hybrid scheme).These softwares incorporate the ability of system survival even on a failure.Many researchers in the field of software engineering have done excellent work to study the reliability of fault-tolerant systems.Most of them consider the stable system reliability.Few attempts have been made in reliability modeling to study the reliability growth for an NVP system.Recently,a model was proposed to analyze the reliability growth of an NVP system incorporating the effect of fault removal efficiency.In this model,a proportion of the number of failures is assumed to be a measure of fault generation while an appropriate measure of fault generation should be the proportion of faults removed.In this paper,we first propose a testing efficiency model incorporating the effect of imperfect fault debugging and error generation.Using this model,a software reliability growth model (SRGM) is developed to model the reliability growth of an NVP system.The proposed model is useful for practical applications and can provide the measures of debugging effectiveness and additional workload or skilled professional required.It is very important for a developer to determine the optimal release time of the software to improve its performance in terms of competition and cost.In this paper,we also formulate the optimal software release time problem for a 3VP system under fuzzy environment and discuss a the fuzzy optimization technique for solving the problem with a numerical illustration.
The channel capacity when the non-Shannon information measure is maximized by normal distribution
R. K. Verma,C. L. Dewangan,P. Jha
International Journal of Contemporary Mathematical Sciences , 2012,
A Common Fixed Point Theorem for Two Pairs of Mappings in Dislocated Metric Space  [PDF]
Dinesh Panthi, Kanhaiya Jha, Pavan Kumar Jha, P. Sumati Kumari
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.52009
Abstract: Dislocated metric space differs from metric space for a property that self distance of a point needs not to be equal to zero. This property plays an important role to deal with the problems of various disciplines to obtain fixed point results. In this article, we establish a common fixed point theorem for two pairs of weakly compatible mappings which generalize and extend the result of Brain Fisher [1] in the setting of dislocated metric space with replacement of contractive constant by contractive modulus for which continuity of mappings is not necessary and compatible mappings by weakly compatible mappings.
Exogenous plankton as food for intensive rearing of ornamental cyprinid, Epalzeorhynchus frenatus
Archivos de Zootecnia , 2010, DOI: 10.4321/S0004-05922010000100002
Abstract: to explore the effect of different management regimes for probable intensification of rainbow shark (epalzeorhynchus frenatus) culture, fish larvae (0.18 ± 0.014 g) were stocked in concrete tanks and cultured for three months (18 february-18 may, 2007) according to six treatment regimes: three live food regimes where fish were stocked at 0.3 fish/l (lf1); 0.5 fish/l (lf2); and 1.0 fish/l (lf3); and three traditional (pelleted) diet regimes where fish were stocked at 0.3 fish/l (td1); 0.5 fish/l (td2); and 1.0 fish/l (td3). exogenous plankton were introduced in the live food tanks. there were three replicates for each treatment, where the fish were fed daily slightly in excess of satiation to eliminate the possibility of food supply being a limiting factor to growth. values of dissolved oxygen were highest in lf1 treatment, followed by lf2, td1, lf3, td2 and td3 (p<0.05). average bicarbonate alkalinity, phosphate, nitrate, nitrite, and ammonium nitrogen were significantly higher (p<0.05) in td2 and td3, compared to other treatments. under any particular diet regime, maximum harvest weight and survival rate of rainbow shark was achieved in the treatments with lowest stocking densities (lf1 and td1), compared to treatments with higher stocking densities (p<0.05). fish deformities were significantly higher in lf3 and td3 (p<0.05), compared with treatments with low stocking densities. at any given stocking density, the live food treatment showed better growth and survival, compared to traditional diet treatment. the number of marketable fish above a set size of 4 g was significantly higher (p<0.05) in lf3 (stocking density of 1.0 fish/l), compared to other treatments. in the traditional diet tanks, increase in stocking density resulted in production loss as very few (17.97% in td2) or none (0% in td3) of the fish produced in these treatments could be marketed. introduction of exogenous plankton as food allowed for increased stocking density for intensive rearing of rainb
Book Review: The Dynamics of Strategy: Mastering Strategic Landscapes of the Firm
Jha, P.
International Journal of Business Science and Applied Management , 2011,
Comparison of two azithromycin distribution strategies for controlling trachoma in Nepal
Holm Susan Osaki,Jha Hem C.,Bhatta Ramesh C.,Chaudhary J.S.P.
Bulletin of the World Health Organization , 2001,
Abstract: OBJECTIVE: The study compares the effectiveness of two strategies for distributing azithromycin in an area with mild-to-moderate active trachoma in Nepal. METHODS: The two strategies investigated were the use of azithromycin for 1) mass treatment of all children, or 2) targeted treatment of only those children who were found to be clinically active, as well as all members of their household. FINDINGS: Mass treatment of children was slightly more effective in terms of decreasing the prevalence of clinically active trachoma (estimated by clinical examination) and of chlamydial infection (estimated by DNA amplification tests), although neither result was statistically significant. CONCLUSION: Both strategies appeared to be effective in reducing the prevalence of clinically active trachoma and infection six months after the treatment. Antibiotic treatment reduced the prevalence of chlamydial infection more than it did the level of clinically active trachoma.
Theoretical Study of Chloro-N-(4-methoxybenzylidene)aniline Derivatives as Corrosion Inhibitors for Zinc in Hydrochloric Acid
S. Kumar,D. G. Ladha,P. C. Jha,N. K. Shah
International Journal of Corrosion , 2013, DOI: 10.1155/2013/819643
Abstract: The density functional theory (DFT) was used to investigate the corrosion inhibition of three inhibitors on zinc. Quantum chemical parameters such as the energy of highest occupied molecular orbital ( ), the energy of lowest unoccupied molecular orbital ( ), energy gap , hardness , softness , electrophilicity index , the fraction of electrons transferred from inhibitor molecule to the metal surface, energy change when both processes occur, namely, charge transfer to the molecule and backdonation from the molecule ( ), natural charge , and Fukui functions have been calculated by using B3LYP/6-31+G(d) basis set. The relation between the inhibition efficiency and quantum chemical parameters has been discussed in order to elucidate the inhibition mechanism of the chloro-N-(4-methoxybenzylidene)aniline derivatives. 1. Introduction Quantitative structure activity relationship (QSAR) has been a subject of intense interest in many disciplines of chemistry. In addition, the results of quantum chemical calculations are obtained without laboratory measurements, thus saving time and equipment and alleviating safety and disposal concerns [1, 2]. Density functional theory (DFT) has a potential application towards the design and development of organic corrosion inhibitors in corrosion field [3]. These facts have made quantum calculations to be very powerful tool for studying corrosion inhibition mechanism. Zinc is one of the most vital nonferrous metals having extensive use in metallic coating [4]. The use of zinc sheets as roofing materials and in galvanization of steel makes the study of its corrosion an important theme [5]. Zinc is often attacked by aggressive media, such as acids, bases, and salt solutions [6–8]. In acidic solutions, zinc has high solubility and dissolves with the formation of Zn2+ ions. Since the solubility of zinc decreases with increasing pH in acidic solutions, precipitation of Zn(OH)2 occurs when a certain pH value is reached. In alkaline solutions, with , the solubility of zinc increases with increasing pH, and in the high pH range, zinc oxide and hydroxides tend to dissolve with the formation of zincate ions. Zinc oxide is a common corrosion product in diluted solutions of salts such as NaCl or Na2SO4 with zinc hydroxide present in various amounts as a minor component. For scale removal and cleaning of zinc surface with acid solutions, the use of organic inhibitors is one of the most practical methods for protection against corrosion, especially in acidic media [9–13]. The aim of this work is to study the effect of quantum chemical
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