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Search Results: 1 - 10 of 579 matches for " Arpita Mazumdar "
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A Secure Off-line Electronic Payment System Based on Bilinear Pairings and Signcryption
Debasis Giri,Arpita Mazumdar
International Journal of Soft Computing & Engineering , 2013,
Abstract: In this paper, we have designed an off-line e-cash payment system based on bilinear pairings for low-value transaction. We use the concept of proxy signcryption for communication among the entities. In our system, the token is issued & authenticated by Bank. Customer delegates the signing capability to Merchant. Bank verifies the original signer (customer) and proxy signer (Merchant) and ensures the originality of the transaction. Unlike the existing e-payment system question of double spending of e-cash arises because each transaction is made uniquely identifiable. Hence, no separate protocol is needed to check double spending. The proposed scheme provides anonymity, authenticity, confidentiality and fairness.
A novel vague set approach for selective contrast enhancement of mammograms using multiresolution  [PDF]
Arpita Das, Mahua Bhattacharya
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.28083
Abstract: The proposed algorithm introduces a novel vague set approach to develop a selective but robust, flexible and intelligent contrast enhancement technique for mammograms. Wavelet based filtering analysis can produce Low Frequency (LF) and High Frequency (HF) subbands of the original input images. The extremely small size microcalcifications become visible under multiresolution techniques. LF subband is then fuzzified by conventional fuzzy c-means clustering (FCM) algorithm with justified number of clusters. HF components, representing the narrow protrusions and other fine details are also fuzzified by FCM with justified number of clusters. Vague set approach captures the hesitancies and uncertainties of truly affected masses/other breast abnormalities with normal glandular tissues. After highlighting the masses/microcalcifications accurately, both LF and HF subbands are transformed back to the original resolution by inverse wavelet transform. The results show that the proposed method can successfully enhance the selected regions of mammograms and provide better contrast images for visual interpretation.
Eventful Non-Events: Distinguishing an Event from a Non-Event in Event Studies  [PDF]
Vivek Kumar, Arpita Srivastava
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.75072
Abstract: Not all interesting events can be subjected to event studies. In this note, we take the example of event studies related corporate political activity to point out some events which though interesting cannot be used for event studies. Event studies in corporate political activity literature study stock market reaction to events such as election results, political parties suddenly coming into power, and ex-employees of a firm getting political positions. I assert that inference drawn in such studies is tautological. I point out an implicit assumption of event studies being violated in these studies. Event studies in this area not suffering from this problem are also pointed out.
Indexing of Yellow Vein Mosaic Disease of Mesta (Hibiscus cannabinus)
Arpita Chatterjee
Pakistan Journal of Biological Sciences , 2013,
Abstract: The assessment of severity with chronological development of disease of mesta (Hibiscus cannabinus, cv. HC-583) on a particular diseased plant was studied. Based on the symptomatology and intensity of diseases caused by Begomovirus an empirical formula was developed. A methodology for assessing the disease intensity of yellow vein mosaic disease of mesta grown under natural field condition was proposed and it was validated by comparing with infected plants grown under field as well as glasshouse conditions. Quantitative assessment of the disease indicated that the disease index value at different stages of pathogenesis varied from 1.82 to 49.44 under field condition whereas the same varied from 2.78 to 50.83 under glasshouse condition. Mortality of infected leaves was noticed when the index value reached maximum. With the present methodology scoring of gradual development of disease has become possible for a particular plant and even for an individual leaf of a particular cultivar.
Study on the Enraging Severity of Cancer in West Bengal, India from 2003 to 2010
Arpita Chatterjee
Asian Journal of Epidemiology , 2011,
Abstract: Cancer mortality rates are climbing in India and it is under-reported due to poor recording of the cause of death. An effective population-based screening program can give reliable data on over-all malignancy profile. An 8-year (2003-2010) multi-centre based study was assessed to understand the malignancy profile in the population of West Bengal. The cancer frequency was moderate during 2003 to 2006, after that it rises drastically and reached maximum peak in 2010. The most frequently affected organs were breast, cervix, stomach, lung, oesophagus, ovary, cheek, prostrate, liver and pancreas, gall bladder and tongue. The incidence in rural areas was slightly low compared to more polluted urban counterparts. Malignancies are in epidemic peak in this population with new cancer cases and greater increase among females. The largest threat among females was seen for breast and cervix cancer, among males for prostate cancer. Among children of age group below 10 years non hodgkins lymphoma was alarmingly high, followed by acute lymphoblastic leukemia and acute myelocytic leukemia. Exposure to various environmental toxicants, industrial wastages, asbestos dusts, colored agricultural commodities and food products incredibly elevate the levels of malignant risk and status. Multiple neoplastic syndromes were common for cancers of liver-lung-brain, breast-ovary, prostrate-lung-bone and others in this population and more specifically in multiple endocrine neoplasias. This devastating cancer scenario can be prevented by public education on tobacco and its health hazards, recommended dietary guidelines, safe sexual practices and lifestyle modifications.
Radiation and Chemical Reaction Effects on Unsteady Double Diffusive Convective Flow past an Oscillating Surface with Constant Heat Flux
Arpita Jain
ISRN Chemical Engineering , 2013, DOI: 10.1155/2013/846826
Abstract: This paper presents an analysis of combined heat and mass transfer flow past an oscillating vertical plate under the action of radiation effects and chemical reaction when heat is supplied to the plate at constant rate. The governing equations are solved in closed form by Laplace-transform technique. The results are obtained for temperature, concentration, velocity, skin friction, Nusselt number, and Sherwood number. The effects of various parameters on flow variables are illustrated graphically, and the physical aspects of the problem are discussed. 1. Introduction Free convection arises in the fluid when temperature changes cause density variation leading to buoyancy forces acting on the fluid elements. The most common example of free convection is the atmospheric flow which is driven by temperature differences. Natural convection has been analyzed extensively by many investigators. Some of them are Revankar [1] Li et al. [2]. Sometimes along with the free convection currents caused by difference in temperature the flow is also affected by the differences in concentration or material constitution. There are many situations where convection heat transfer phenomena are accompanied by mass transfer also. When mass transfer takes place in a fluid at rest, the mass is transferred purely by molecular diffusion resulting from concentration gradients. For low concentration of the mass in the fluid and low mass transfer rates, the convective heat and mass transfer processes are similar in nature. A number of investigations have already been carried out with combined heat and mass transfer under the assumption of different physical situations. The illustrative examples of mass transfer can be found in the book of Cussler [3]. Combined heat and mass transfer flow past a surface are analyzed by Chaudhary and Arpita. [4], Muthucumaraswamy et al. [5, 6] and Rajput and Kumar [7] with different physical conditions. Juncu [8] pioneered unsteady heat and mass transfer flow past a surface by numerical method. Combined heat and mass transfer problems with chemical reaction are of importance in many processes and have, therefore, received a considerable amount of attention in recent years. Chemical reaction can be codified as either homogeneous or heterogeneous processes. A homogeneous reaction is one that occurs uniformly through a given phase. In contrast, a heterogeneous reaction takes place in a restricted region or within the boundary of a phase. A reaction is said to be first order if the rate of reaction is directly proportional to the concentration itself which
Some Possibility and Impossibility Results related to Discrete Fourier type transforms in Quantum Information
Arpita Maitra
Physics , 2006,
Abstract: Very recently the most general ensemble of qubits are identified using the notion of linearity; any of these qubits gets accepted by a Hadamard gate to generate the equal superposition of the qubit and its orthogonal. Towards more generalization, we investigate the possibility and impossibility results related to Discrete Fourier Transform (DFT) type of operations for a more general set up of qutrits.
Microbial Removal of Phenol and P-Chlorophenol from Industrial Waste Water Using Rhodococcus sp.RSP8 and Its Growth Kinetic Modeling  [PDF]
Pronoy Kumar Sinha, Arpita Sinha, Manas Das
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.38073
Abstract: A phenol-degrading microorganism, Rhodococcus sp.RSP8, was used to study the substrate interactions during cell growth on phenol and p-chlorophenol dual substrates. Both phenol and p-chlorophenol could be utilized by the bacteria as the sole carbon and energy sources. When cells grew on the mixture of phenol and p-chlorophenol, strong substrate interactions were observed. The p-chlorophenol inhibited the degradation of phenol, on the other hand, phenol also inhibited the utilization of p-chlorophenol. The overall cell growth rate depends on the co-actions of phenol and p-chlorophenol. In addition, the cell growth and substrate degradation kinetics of phenol, p-chlorophenol as single and mixed substrates for Rhodococcus sp.RSP8 in batch cultures were also investigated over a wide range of initial phenol concentrations (5-1600 mg.L–1) and initial p-chlorophenol concentrations (5 – 250 mg.L–1). The single-substrate kinetics was described well using the Haldane-type kinetic models, with model constants of µm1 = 0.15 h–1, KS1 = 2.22 mg.L–1 and Ki1 = 245.37 mg.L–1 for cell growth on phenol and of µm2 = 0.0782 h–1, KS2 = 1.30 mg.L–1 and Ki2 = 71.77 mg.L–1, K′i2 = 5480 (mg.L–1)2 for cell growth on p-chlorophenol. Proposed cell growth kinetic model was used to characterize the substrates interactions in the dual substrates system.
Solving Intuitionistic Fuzzy Linear Programming Problem  [PDF]
Arpita Kabiraj, Prasun Kumar Nayak, Swapan Raha
International Journal of Intelligence Science (IJIS) , 2019, DOI: 10.4236/ijis.2019.91003
Abstract: Intuitionistic Fuzzy Set (IFS) can be used as a general tool for modeling problems of decision making under uncertainty where, the degree of rejection is defined simultaneously with the degree of acceptance of a piece of information in such a way that these degrees are not complement to each other. Accordingly, an attempt is made to solve intuitionistic fuzzy linear programming problems using a technique based on an earlier technique proposed by Zimmermann to solve fuzzy linear programming problem. Our proposed technique does not require the existing ranking of intuitionistic fuzzy numbers. This method is also different from the existing weight assignment method or the Angelov’s method. A comparative study is undertaken and interesting results have been presented.
Assessing Vulnerability to Chronic Undernutrition among Under-Five Children in Egypt: Contextual Determinants of an Individual Consequence
Sumit Mazumdar
International Journal of Population Research , 2012, DOI: 10.1155/2012/939541
Abstract: Nutritional outcomes remain an important development indicator and reflect a household's vulnerability to improved quality of life. Drawing upon recent household survey data from Egypt, this paper applies hierarchical models to test the effect of contextual factors on chronic undernutrition among under-five children and identifies the demographic and socioeconomic characteristics that underscore such vulnerability. Results indicate considerable neighborhood effects influencing a household’s nutritional choices. However, no significant effect could be identified for mother’s education and women’s decision-making power, but a clear positive association is evident between nutritional status and better health service utilization as well as child care and feeding practices. Focused intervention strategies need to augment household level behavioral change for these identified factors and supplement such individual efforts with targeted strategies aimed at vulnerable Egyptian communities to reduce child undernutrition. 1. Introduction Hunger and nutritional failure signify both the cause as well as the consequence of a household’s vulnerability to economic shocks, chronic and transient, and an important indicator of food insecurity, poverty, and deprivation of well-being. Assessment and understanding of the phenomenon of nutritional deprivation is crucial for gaining insights into vulnerability; it can be in identifying the causative factors and their pathways of influencing household food security. Furthermore, being a quantifiable outcome, objective indicators of nutritional failure can be decomposed to observe the relative influence of sociocultural, economic, community-specific, and geographical vulnerabilities, which aids in prioritizing corrective intervention programs. Conventional vulnerability analyses has been predominantly focused on the production and availability of grain staples at the expense of other indicators, such as lack of access to health services, nutritional status, cultural practices, and gender inequality. Such analyses failed to identify which population groups fell at relatively greater risk, and the underlying reasons. This paper concentrates on child malnutrition, owing to its sublime importance towards development goals and future economic impact. Malnourishment during the early years can contribute to the prospective vulnerability of a household and can jeopardize the possibility of moving out of poverty traps. We examine relative vulnerability across households and individuals towards adverse nutritional outcomes, from the
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