Performance Study of Cryptography based Dynamic Multi-Keyword Searchable Security Algorithm in Cloud Using CRSA /B+ Tree

Today, Cloud computing is a buzz word in IT industry. Cloud, a shared pool of computing resources, allows access to needed resources on demand through internet and web applications. Since data is outsourced to third party, user needs to maintain the accountability of their data in cloud. Hence preserving the confidentiality and securing the sensitive data in cloud is a major concern. Many cryptographic techniques have been proposed by researchers to assure the confidentiality of the user2019;s data in cloud. But, the challenging task is to provide the secure search over this preserved data which has been encrypted so as to retrieve the effective data. Hence, we are proposing a system to have a secure search over the encrypted data on the cloud which preserves its confidentiality. In our system, a noble approach has been made using the Commutative-RSA algorithm, a cryptographic technique where the dual encryption takes place thus reducing the overall computation overhead. The search operation over the encrypted data is based on the tree search algorithm which supports multi-keyword search. Based on the relevance score, the more appropriate data is retrieved on the search operation. Using this approach, the information is not leaked when the encrypted data is searched by users and also the queries are handled in an efficient way. Finally, we demonstrate the effectiveness and efficiency of the proposed schemes through extensive experimental evaluation

Group Decision Making in Conditions of Uncertainty using Fermat’s Weak Fuzzy Graphs and Beal’s Weak Fuzzy Graphs

Decision making is a process of solving problems for choosing the best alternative. The best way to illustrate the alternatives and relation between them is a graph. Developing a fuzzy graph is the convenient way of illutration if there is uncertainty in alternatives or in their relation. In group decision making problems, according to a group of experts, the relation between alternatives involves measure of preference and non preference. Intuitionistic fuzzy graph has limitations to model such problems. In n- Pythagorean fuzzy graphs the hesitancy degree and other decision tools are restricted to second degree.To overcome the flaws of intuitionistic fuzzy graphs and n- Pythagorean fuzzy graphs, we introduced Fermat’s Fuzzy Graphs in 2022. In this  paper the decision tools are generalized for Fermat’s Fuzzy Graphs. A practical example of selection of investement scheme is illustrated. Finally, Beal’s Fuzzy graphs is developed as generalization of Fermat’s Fuzzy Graphs

Stability of accretion disk around rotating black holes: a pseudo-general-relativistic fluid dynamical study

We discuss the solution of accretion disk when the black hole is chosen to be rotating. We study, how the fluid properties get affected for different rotation parameters of the black hole. We know that no cosmic object is static in Universe. Here the effect of the rotation of the black hole to the space-time is considered following an earlier work of the author, where the pseudo-Newtonian potential was prescribed for the Kerr geometry. We show that, with the inclusion of rotation of the black hole, the valid disk parameter region dramatically changes and disk becomes unstable. Also we discuss about the possibility of shock in accretion disk around rotating black holes. When the black hole is chosen to be rotating, the sonic locations of the accretion disk get shifted or disappear, making the disk unstable. To bring it in the stable situation, the angular momentum of the accreting matter has to be reduced/enhanced (for co/counter-rotating disk) by means of some physical process.Comment: 24 Latex pages including 7 figures; Accepted for publication in Astrophysical Journa

Serum magnesium and its association with vascular calcification in chronic kidney disease patients on haemodialysis

Background: Cardiovascular disease is one of the leading causes of death in chronic kidney disease (CKD). It has been observed that haemodialysis patients have a high prevalence of cardiac risk factors with further risk due to abnormal mineral metabolism. A study has demonstrated that a higher serum magnesium significantly decreased the mortality risk in haemodialysis patients and lower serum Mg level has been found to be associated with increased mortality in them. The aim of the study was to characterize the relationship between Mg level and vascular calcification in CKD patients.Methods: It was a cross sectional study conducted in 100 CKD patients attending outpatient and inpatient ward of Tagore Medical College and Hospital, Chennai, Tamil Nadu, India. Serum magnesium levels will be measured using Xylidyl blue method. Carotid intimal medial thickness will be measured using Doppler.Results: In the study 10 patients did not show the sign of any calcification. Among the remaining 90 patients, 42 patients showed calcification and 48 patients showed stenosis. The statistical analysis showed a spearman correlation coefficient value of 0.201 thus showing only a weak association.Conclusion: The present study showed that only a weak relationship exists between the magnesium level and vascular calcification

Non-minimal coupling of photons and axions

We establish a new self-consistent system of equations accounting for a non-minimal interaction of gravitational, electromagnetic and axion fields. The procedure is based on a non-minimal extension of the standard Einstein-Maxwell-axion action. The general properties of a ten-parameter family of non-minimal linear models are discussed. We apply this theory to the models with pp-wave symmetry and consider propagation of electromagnetic waves non-minimally coupled to the gravitational and axion fields. We focus on exact solutions of electrodynamic equations, which describe quasi-minimal and non-minimal optical activity induced by the axion field. We also discuss empirical constraints on coupling parameters from astrophysical birefringence and polarization rotation observations.Comment: 31 pages, 2 Tables; replaced with the final version published in Classical and Quantum Gravit

LIFESTYLE FACTORS AND OBESITY AMONG ADOLESCENTS IN RURAL SOUTH INDIA

Objectives: To estimate the prevalence of obesity among adolescents of thestudy area and to study the association of physical activity, dietary habitswith obesity.Methods: This was a school based cross sectional study conducted among 2963 adolescents in Udupi. They were interviewed using pre-testedquestionnaire, followed by body mass index measurement and classification using World Health Organization criteria. Statistical analysis was doneusing Mann–Whitney U-test, Kruskal–Wallis test, and Chi-square tests.Results: The prevalence of overweight was 2.4% and obesity 1.4% and they were higher among the adolescents belonging to higher socio-economicstatus, among those using motorized transport. Furthermore, 93.2% of the subjects consumed readymade food items apart from homemade ones,28.8% of them had the habit of eating in between the regular meals, and 59.6% of the subjects had the habit of consuming carbonated beveragesregularly.Conclusions: Current levels of obesity and lifestyle factors among the adolescents in the study area can significantly predispose them to the risk ofnon-communicable diseases, which needs to be considered while making policies for non-communicable diseases.Keywords: Adolescents, Obesity, Overweight, Lifestyle, Diet, World Health Organization

The Einstein static universe with torsion and the sign problem of the cosmological constant

In the field equations of Einstein-Cartan theory with cosmological constant a static spherically symmetric perfect fluid with spin density satisfying the Weyssenhoff restriction is considered. This serves as a rough model of space filled with (fermionic) dark matter. From this the Einstein static universe with constant torsion is constructed, generalising the Einstein Cosmos to Einstein-Cartan theory. The interplay between torsion and the cosmological constant is discussed. A possible way out of the cosmological constant's sign problem is suggested.Comment: 8 pages, LaTeX; minor layout changes, typos corrected, one new equation, new reference [5], completed reference [13], two references adde