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Search Results: 1 - 10 of 3377 matches for " Praveen Mishra "
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ANALYSIS OF MITM ATTACK IN SECURE SIMPLE PAIRING
Praveen Mishra
Journal of Global Research in Computer Science , 2013,
Abstract: This paper explain on different types of MITM attacks, their consequences, techniques and solutions under different circumstances giving users options to choose one from various solutions . Man-In-The-Middle (MITM) attack is one of the primary techniques in computer based hacking. MITM attack can successfully invoke attacks such as Denial of service, DNS spoofing and Port stealing. MITM attack of every kind has lot of surprising consequences in store for users such as, stealing online account user id, password, stealing of local ftp id, or telnet session etc. Man-in-the-middle attack is used wildly as a method of attacking the network. To discover how this type of attack works, this paper describes a method of man-in-the-middle attack based on ARP spoofing, and proposes a method of preventing such attacks. a new method is proposed in this paper to secure the exchange of public keys in SSP. By adopting the proposed technique, the exchange of public key becomes more secure and consequently, the process of SSP will be secure, reliable and provide protection against Man-In-The-Middle (MITM) attacks.
Biosorption of diesel and lubricating oil on algal biomass
Praveen Kumar Mishra,Suparna Mukherji
3 Biotech , 2012, DOI: 10.1007/s13205-012-0056-6
Abstract: Algae are widely used as biosorbent for the sorption of heavy metals, however sorption of oil on algae has not been explored. Algae in marine and fresh water environment may affect the fate and transport of spilled oil. Sorption of diesel and lubricating oil was studied using dead biomass of Spirulina sp. and Scenedesmus abundans. The rate and extent of sorption was studied in well mixed batch systems containing oil (0.1–2 %, v/v) and biomass (0.1 %) suspended in water. Sorption of diesel on Spirulina sp. was instantaneous. Rate limited sorption on algal biomass could be explained by the pseudo-second order model and equilibrium was established within 12 days. The Freundlich and Langmuir model could provide adequate fit for diesel sorption on algae but not for lubricating oil. A three parameter model, the Sips model, provided good fit for all the experimentally generated isotherms and yielded maximum sorption capacity of diesel and lubricating oil in the range of 12–14 g/g. Oil sorption on algae was comparable to other spill clean-up sorbents. Algae can be used for development of low cost sorbents and can facilitate removal of oil from contaminated water. Sorption is affected both by the type of oil and type of algae. This is the first study illustrating that the additives present in lubricating oil not only reduces the sorption rate but also alters sorption equilibrium such that two-parameter isotherms are inadequate.
Kinetic Study of Hydrolysis of Tri-2,5-diethoxy Aniline Phosphate (An Organo Phosphorus Pesticide) in Acid Medium
Alka Tangri,Pradeep Mishra,Praveen Kumar
International Journal of Chemistry , 2010, DOI: 10.5539/ijc.v2n1p147
Abstract: The present work pertains to synthesis, kinetic behavior and mechanism of hydrolysis of some organophosphorus pesticides. The compound investigated here was 2,5-diethoxyaniline in particular. The corresponding tri-phosphate ester was prepared in the laboratory by phosphorylation with POCI3. The process involved is that of the substitution of –OH group of orthophosphoric acid by aryl radical. The kinetics of the hydrolysis of the above ester was studied in acidic media. The acid employed was HCI. In acidic media, hydrolysis was carried out at three different temperatures 80, 90 and 980C (keeping other parameters of the experiment unchanged). The rate of hydrolysis is found to follow the Arrhenius equation. The values of the Arrhenius parameters-energy of activation and change of entropy-point to the bimolecular nature of the hydrolysis of the triester. It can be inferred from the ionic strength data in the range 0.01 to 5 M-HCI, the reactive species of the present triester is conjugate acid species. Effects of temperature, and solvent on the rate of reaction, together with the correlation of rates with acidity and Bunnett parameters favour bimolecular nature of hydrolysis. The above results lead to the following most probable route of hydrolysis. In the case of triesers, dioxane was already present as constituent of the solvent. Experiment was repeated at three different dioxane concentrations in each case. The analysis of these data led to the interpretation that a transition state is formed with charge dispersed out of the reactive species and water and that the hydrolysis is a bimolecular nucleophilic reaction. The theoretical part of the present work includes calculation of the various terms involved in the mathematical formation of Hammett, Zucker and Hammett, Bunnett and Bunnett and Olsen hypothesis. This part supports the interpretation of the experiment results regarding the molecularity of the reaction.
Diagnostic and prognostic utility of an inexpensive rapid on site malaria diagnostic test (ParaHIT f) among ethnic tribal population in areas of high, low and no transmission in central India
Neeru Singh, AK Mishra, MM Shukla, SK Chand, Praveen Bharti
BMC Infectious Diseases , 2005, DOI: 10.1186/1471-2334-5-50
Abstract: A finger prick blood sample was collected from each clinically suspected case of malaria to prepare blood smear and for testing with the RDT after taking informed consent. The blood smears were read by an experienced technician blinded to the RDT results and clinical status of the subjects. The figures for specificity, sensitivity, accuracy and predictive values were calculated using microscopy as gold standard.The prevalence of malaria infection estimated by RDT in parallel with microscopy provide evidence of the type of high, low or no transmission in the study area. Analysis revealed (pooled data of all four epidemiological settings) that overall sensitivity, specificity and accuracy of the RDT were >90% in areas of different endemicity. While, RDT is useful to confirm the diagnosis of new symptomatic cases of suspected P. falciparum infection, the persistence of parasite antigen leading to false positives even after clearance of asexual parasitaemia has limited its utility as a prognostic tool.The study showed that the ParaHIT f test was easy to use, reliable and cheap. Thus this RDT is an appropriate test for the use in the field by paramedical staff when laboratory facilities are not available and thus likely to contribute greatly to an effective control of malaria in resource poor countries.Malaria presents a diagnostic challenge in most tropical countries [1] and diagnosis of malaria still relies predominantly upon clinical presentation and the century old technique of microscopic examination of blood smears. Diagnosis by clinical symptoms alone is highly unreliable [2]. Microscopy is labour intensive, requires significant skills and time, which caused therapeutic delays. These diagnostic limitations affects the medical care provided, as Malaria is a potentially fatal disease, usually curable if diagnosed quickly [3,4]. The urgency and importance of obtaining results quickly from the examination of blood samples from patients with suspected acute malaria is
Modal Dispersion Characteristics of a Single Mode Dielectric Optical Waveguide with a Guiding Region Cross-Section Bounded by Two Involuted Spirals
Praveen Chandra Pandey;Akta Mishra;Sant Prasad Ojha
PIER , 2007, DOI: 10.2528/PIER07022702
Abstract: With the use of scalar field approximation we make an analytical study of a dielectric waveguide whose core cross-section is bounded by two spirals of the form 1/ = ξθ. This waveguide is similar to that of a distorted slab waveguide in which both a curvature and a flare are present. We derived the modal characteristic equation by analytical analysis under the weak guidance approximation. We find the modal dispersion curve, which support only single mode propagation and the same compared with the same kind of waveguide with metal claddings.
Genotype-phenotype correlation of β-thalassemia spectrum of mutations in an Indian population
Praveen Kishore Sahu,Sudhanshu Shekhar Pati,Saroj Kanti Mishra
Hematology Reports , 2012, DOI: 10.4081/hr.2012.e9
Abstract: Coexistence of thalassemia, hemoglobinopathies and malaria has interested geneticists over many decades. The present study represents such a population from the eastern Indian state of Orissa. Children and their siblings (n=38) were genotyped for β-thalassemia mutations and genotype-phenotype correlation was determined. The major genotype was IVS 1.5 mutation: 26% homozygous (n=10) and 37% (n=14) double heterozygous with other mutations or hemoglobinopathies. Sickle hemoglobin was the major associated hemoglobinopathy (n=12, 32%). Other mutations found were Cd 8/9, HbE and Cd 41/42. The study population did not contain any IVS 1.1 mutations which is the second major Indo- Asian genotype. Genotype-phenotype correlation revealed that genotypes of IVS 1.5, Cd 8/9 Cd 41/42 alone or in association, exhibit severe, moderate and mild severity of thalassemia, respectively. Identification of the mutation at an early age as a part of new born screening and early intervention may help reduce the thalassemia-related morbidity.
EXPERIMENTAL INVESTIGATION OF SEN AND MOULD FOR CONTINUOUS SLAB CASTER BY PHYSICAL MODELLING
PRAVEEN MISHRA,S.K.AJMANI,ARBIND KUMAR,K.K.SHRIVASTAVA
International Journal of Engineering Science and Technology , 2012,
Abstract: Steel makers, at present, are aiming for higher casting speeds of liquid steel, giving equal importance to the product quality. In a continuous slab caster, a higher casting speed leads to several problems, such as higher meniscus fluctuations and frequent vortex formation, resulting in entrainment of slag into the liquid steel. So the control of the meniscus fluctuation plays an important role in attaining a better product quality and this meniscusfluctuations are very much depend upon the flow pattern of molten metal inside the mold.The present investigation was aimed to study the dynamic performance of submerged entry nozzlebased on the water modelling studies for higher casting speed with respect to minimum surface fluctuations.The experiments were carried out to study the effect of different operating parameters on meniscus fluctuations. The performance of 00 and 150 downward rectangular ports were studied by varying the different operating parameters. The wave amplitude of the fluctuations was found to be increasing with the increase in casting speed for both 00and 150downward ports.
REVIEW ARTICLE ON PHYSICAL AND NUMERICAL MODELLING OF SEN AND MOULD FOR CONTINUOUS SLAB CASTING
PRAVEEN MISHRA,S.K. AJMANI,ARBIND KUMAR,K.K.SHRIVASTAVA
International Journal of Engineering Science and Technology , 2012,
Abstract: Over the years, considerable efforts have been made to study the performance of Submerged Entry Nozzle (SEN) and mould of continuous slab caster. Numerous physical and numerical modelling studies have already been carried out and reported in the literature to study the fluid flow behaviour inside the mould. Based on the extensive literature search, a summary of these is presented here. For the sake of convenience, the studies have been categorized into two major groups, e.g., physical modelling and numerical modelling. In each of these categories, a large number of publications on various aspects have been reported. Sufficiently reliable numerical models are also currently available and these also allow one to carry out full scale predictions and useful engineering design calculations.
Biomedical Waste Management: Awareness and Practices in a District of Madhya Pradesh
Manoj Bansal, Ashok Mishra, Praveen Gautam, Richa Changulani, Dhiraj Srivastava, Neeraj Singh Gour
National Journal of Community Medicine , 2011,
Abstract: Background: A hospital is an establishment that provides medical care facilities. Since the majority of the persons receiving treatment in the hospital are suffering with infectious diseases therefore, the waste generated in hospital has potential to transmit infections and other hazards to hospital staff and nearby community, if not managed adequately. Adequate awareness in the hospital staff and practices regarding the biomedical waste management is crucial to prevent these hazards. Objective: To assess the awareness and existing practices regarding biomedical waste and its management in a district of Madhya Pradesh. Material And Methods: The present study was a cross sectional study carried out in both urban and rural health facilities of Gwalior district from Jan to Jun 2008. Only those hospitals having indoor care facility were included randomly. Medical, para-medical and non-medical personnel working at their current position for at least 6 months were included as study participants to assess awareness. Statistical Analysis: Percentage and Proportion were applied to interpret the result. Results: Awareness regarding biomedical waste management was highest among doctors followed by para-medical staff and least among non-medical staff. Practices of waste management in hospitals were grossly inadequate, particularly in rural area. Conclusion: The present study concludes that regular orientation and re-orientation training programs should be organized for hospital staff and strict implementation of guidelines of biomedical waste management, to protect themselves and hospital visitors.
A Radiographic Evaluation of Mandibular Asymmetry in Class II Division 1 Malocculsion Pattern
Manish Bajracharya,Praveen Mishra,Prakash Bhattarai,Umesh Parajuli,Reetu Shrestha,Keshab Raj Poudel
Orthodontic Journal of Nepal , 2012, DOI: 10.3126/ojn.v2i1.9289
Abstract: DOI: http://dx.doi.org/10.3126/ojn.v2i1.9289 Orthodontic Journal of Nepal Vol.2(1) 2012: 16-20
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