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User Centric Block-Level Attribute Based Encryption in Cloud Using Blockchains

Computer Systems Science & Engineering 2022年第8期42卷 605-618页

作者： S.Godfrey Winster a.siva kumar R.Ramesh Department of Computer Science and Engineering School of ComputingCollege of Engineering and TechnologySRM Institute of Science and TechnologyChengalpattu603203India Department of Information Technology Sri Sai Ram Engineering CollegeChennai600044India Department of Electronics and Communication Engineering Saveetha Engineering CollegeChennai602105India

Cloud computing is a collection of distributed storage Network which can provide various services and store the data in the efficient *** advantages of cloud computing is its remote access where data can accessed in real time using Remote Method Innovation(RMI).The problem of data security in cloud environment is a major concern since the data can be accessed by any time by any *** to the lack of providing the efficient security the cloud computing they fail to achieve higher performance in providing the efficient *** improve the performance in data security,the block chains are used for securing the data in the cloud ***,the traditional block chain technique are not suitable to provide efficient security to the cloud data stored in the *** this paper,an efficient user centric block level Attribute Based Encryption(UCBL-ABE)scheme is presented to provide the efficient security of cloud data in cloud *** proposed approach performs data transaction by employing the block *** proposed system provides efficient privacy with access control to the user access according to the behavior of cloud user using Data Level Access Trust(DLAT).Based on DLAT,the user access has been restricted in the cloud *** proposed protocol is implemented in real time using Java programming language and uses IBM *** implementation results justifies that the proposed system can able to provide efficient security to the data present in and cloud and also enhances the cloud performance.

关键词： Cloud blockchain data security ABE block-level

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Fluorine-containing oxidizers for metal fuels in energetic formulations

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Defence Technology（防务技术） 2019年第1期15卷 1-22页

作者： siva kumar Valluri Mirko Schoenitz Edward Dreizin New Jersey Institute of Technology Tomsk State University

Fluorine containing oxidizers, primarily polymers, are extensively used in pyrotechnic *** oxidizers are less explored for metalized propellants and explosives despite a potential advantage of substantial heat release combined with gaseous combustion products. This review summarizes different types of fluorinated oxidizers used in energetic formulations or of potential interest for such systems, including gases, polymers, and inorganic compounds. Types of energetic formulations employing metals and fluoropolymers are discussed in more detail, including methods used to prepare composites and resulting salient features of the obtained materials. Laboratory experiments characterizing such materials, in particular, electron microscopy and thermal analysis, are discussed, showing characteristic morphologies and reaction sequences observed in different metal-fluorinated oxidizer composites. Striking similarities are noted in reaction sequences for diverse compositions hinting at possible similarities in the respective reaction mechanisms. Experiments probing ignition and combustion of metal-fluorinated oxidizer composites in laboratory conditions are also reviewed, including impact, flash heating and shock ignition. Finally, some practical performance tests for energetic formulations are described following by a brief discussion of the reaction mechanisms expected to govern ignition and combustion in various metal-fluorinated oxidizer composites. The conclusions are combined with recommendation for future research in the area of reactive metal-fluorinated oxidizer composites.

关键词： Reactive materials Composites Redox reactions Pyrotechnics Propellants Explosives

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Improving Performance of a Distributed File System Using a Speculative Semantics-Based Algorithm

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Tsinghua Science and Technology 2015年第6期20卷 583-593页

作者： Talluri Lakshmi siva Rama Krishna Thirumalaisamy Ragunathan Sudheer kumar Battula K L University Andhra PradeshIndia and Research ScholarJawaharlal Nehru Institute of Advanced Studies (JNIAS) ACE Engineering College

File-sharing semantics is used by the file systems for sharing data among concurrent client processes in a consistent manner. Session semantics is a widely used file-sharing semantics in Distributed File Systems(DFSs). The main disadvantage of session semantics is that writes to an open file are visible to the concurrent client processes only during their next session. Recently, "linearizability semantics" was introduced in Blob Seer DFS, in which a Read Client Process(RCP) can read only a previous version of a binary large object(blob), while update operations are carried out on that blob in a concurrent manner. In this paper, we propose a new type of file-sharing semantics, namely "speculative semantics", which permits writes to an open file to be visible to other concurrent processes provided that data consistency is not affected. In addition, we propose a new read algorithm for DFSs based on speculative semantics and a new performance measurement metric called Currency. The experimental results obtained using Blob Seer DFS indicate that the proposed read algorithm performs better than the existing read algorithm of Blob Seer DFS.

关键词： distributed system Hadoop Blobseer concurrency spe

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Peroxisome proliferator-activated receptor agonists:A new hope towards the management of alcoholic liver disease

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World Journal of Gastroenterology 2024年第35期30卷 3965-3971页

作者： siva Sundara kumar Durairajan Abhay kumar Singh Ashok Iyaswamy Department of Microbiology School of Life SciencesCentral University of Tamil NaduTiruvarur 610005India School of Biomedical Sciences Li Ka Shing Faculty of MedicineUniversity of Hong KongHong Kong 999077China School of Chinese Medicine Hong Kong Baptist UniversityHong Kong 999077China Department of Biochemistry Karpagam Academy of Higher EducationCoimbatore 641021India

In this editorial,we examine a paper by Koizumi et al,on the role of peroxisome proliferator-activated receptor(PPAR)agonists in alcoholic liver disease(ALD).The study determined whether elafibranor protected the intestinal barrier and reduced liver fibrosis in a mouse model of *** study also underlines the role of PPARs in intestinal barrier function and lipid homeostasis,which are both affected by *** therapies are necessary for ALD because it is a critical health issue that affects people *** editorial analyzes the possibility of PPAR agonists as treatments for *** key factors of inflammation and metabolism,PPARs offer multiple methods for managing the complex etiology of *** assess the abilities of PPARα,PPARγ,and PPARβ/δagonists to prevent steatosis,inflammation,and fibrosis due to liver *** research carried out in preclinical and clinical settings has shown that PPAR agonists can reduce the severity of liver *** editorial discusses the data analyzed and the obstacles,advantages,and mechanisms of action of PPAR agonists for *** research is needed to understand the efficacy,safety,and mechanisms of PPAR agonists for treating ALD.

关键词： Alcoholic liver disease Peroxisome proliferator-activated receptors Peroxisome proliferator-activated receptors agonists Liver fibrosis Inflammation Metabolic regulation Hepatoprotection

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Evaluation of phytochemical and antioxidant activities of the different fractions of Hybanthus enneaspermus (Linn.) ***. (Violaceae).

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Asian Pacific Journal of Tropical Medicine 2011年第5期4卷 391-396页

作者： Dinesh kumar Patel Rajesh kumar Damiki Laloo siva Hemalatha Pharmacognosy Research Laboratory Department of PharmaceuticsInstitute of TechnologyBanaras Hindu UniversityVaranasi-221005.India

Objective:To investigate the naturally occurring antioxidant for the first time from the different solvent fractions of Hybanthus enneaspermus（***） Linn ***（Violaceae）. Methods:Different fractions of *** were tested for total phenolic content,and in vitro antioxidant activity was measured by total antioxidant assay,DPPH assay,reducing power, nitric oxide（NO）,hydrogen peroxide（H2O2） scavenging ***:The ethyl acetate（EA） fraction was found to have high levels of phenolic content[（212.15±0.79） mg GAE/g].The EA fraction exhibited higher total antioxidant capacity,higher percentage of DPPH radical scavenging activity[（127.07±2.29） Fg/mL],nitric oxide[（245.16±1.44）μg/mLJ,hydrogen peroxide[（227.38±7.18）μg/mL],deoxyribose[（270.61±8.72）μg/mL]and higher reducing *** was a significant correlation between total phenolic content and total antioxidant activity（r =0.972）. Conclusions:These results reveal that EA fraction of *** has strong antioxidant potential compared with other *** further study has been extended to the isolation of the possible compound that is responsible for having antioxidant property.

关键词： Hybanthus enneaspermus Antioxidant Total phenolics

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Pedalium murex Linn.:An overview of its phytopharmacological aspects

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Asian Pacific Journal of Tropical Medicine 2011年第9期4卷 748-755页

作者： Dinesh kumar Patel Damiki Laloo Rajesh kumar siva Hemalatha Pharmacognosy Research Laboratory Department of PharmaceuticsInstitute of Technology.Banana Hindu University

Pedalium murex Linn(family:Pedaliaceae)(***) commonly known as Large Caltrops and Gokhru(India) is a shrub found in the Southern *** region of India and in some parts of *** parts of the plant are used to treat various ailments like,cough,cold and as an *** is reported traditionally to have an excellent cure in patients with reproductive disorders which are mainly impotency in *** emissions,gonorrhoea as well as leucorrhoea in *** plant has also benifiled in complications like urinary track disorder as well as gastro intestinal tract *** the plant is popular for the presence of a considerable amount of diosgenin and vanillin which are regarded as an important source and useful starting materials for synthesizing steroidal contraceptive drugs and isatin *** phytochemicals reported in the plant includes *** acid,caffeic acid,amino acids(glycine,histidine,tyrosine,threonine,aspartie acid and glutamic acid) and various classes of fatty acids(triacontanoic acid,*** and heptatriacontan-4-one).Pharmacologically,the plant have been investigated for antiulcerogenic. ***,aphrodisiac,antioxidant,antimicrobial and insecticidal *** all these reports it can be concluded that the plant were found to have a better profile with potential natural source for the treatment of various range of either acute or chronic *** overall database of our review article was collected from the scientific sources in regards with all the information ol the research article for *** published so far.

关键词： Pedalium murex Tissue culture Phytochemistry Ulcerogenic Aphrodisiac Nephroprotective Antioxidant Antimicrobial

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Purcell's Swimmer Revisited

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International Journal of Automation and computing 2012年第3期9卷 325-330页

作者： M. siva kumar P. Philominathan Faculty Oman Dental College P.O. Box 835 Postal Code 116 Sultanate of Oman Research and PG Department of Physics AVVM Sri Pushpam College

Purcell’s swimmer was proposed by E. M. Purcell to explain bacterial swimming motions. It has been proved experimentally that a swimmer of this kind is possible under inertial-less and high viscous environment. But we could not investigate all the aspects of this mechanism through experiments due to practical difficulties. The computational fluid dynamics (CFD) provides complementary methods to experimental fluid dynamics. In particular, these methods offer the means of testing theoretical advances for conditions unavailable experimentally. Using such methodology, we have investigated the fluid dynamics of force production associated with the Purcell’s swimmer. By employing dynamic mesh and user-defined functions, we have computed the transient flow around the swimmer for various stroke angles. Our simulations capture the bidirectional swimming property successfully and are in agreement with existing theoretical and experimental results. To our knowledge, this is the first CFD study which shows the fact that swimming direction depends on stroke angle. We also prove that for small flapping frequencies, swimming direction can also be altered by changing frequency-showing breakdown of Stokes law with inertia.

关键词： Very low Reynolds number flow swimming motion of bacteria dynamic mesh Purcell’s swimmer Stokes flow

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Volumetric, Ultrasonic and Transport Properties of Binary Liquid Mixtures Containing Dimethyl Formamide at 303.15 K

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Chinese Journal of Chemistry 2007年第1期25卷 32-43页

作者： SYAMALA, Vardhana RAJA SEKHAR, Damaramadugu siva kumar, Kasibhatta VENKATESWARLU, Ponneri Thermochemical Laboratories Department of Chemistry Sri Venkateswara University Tirupati 517 502 India Department of Chemistry SVArts College Tirupati 517 502 India

Excess volumes （v^E）, ultrasonic velocities （u）, isentropic compressibility （△Ks） and viscosities （η） for the binary mixtures of dimethyl formamide （DMF） with 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,2,4-trichlorobenzene, o-chlorotoluene, m-chlorotoluene, p-chlorotoluene, o-nitrotoluene and m-nitrotoluene at 303.15 K were studied. Excess volume data exhibit an inversion in sign for the mixtures of dimethyl formamide with 1,2- and 1,3-dichlorobenzenes and the property is completely positive over the entire composition range for the mixtures of dimethyl formamide with 1,2,4-trichlorobenzene, o-nitrotoluene and m-nitrotoluene. On the other hand, the quantity is negative for the mixtures of dimethyl formamide with chlorotoluenes. Isentropic compressibility （Ks） has been computed for the same systems from precise sound velocity and density data. Further, deviation of isentropic com- pressibility （△Ks） from ideal behavior was also calculated. AKs values are negative over the entire volume fraction range in all the binary mixtures. The experimental sound velocity data were analysed in terms of Free Length Theory （FLT） and Collision Factor Theory （CFT）. The viscosity data were analysed on the basis of corresponding state approach. The measured data were discussed on the basis of intermolecular interactions between unlike molecules.

关键词： excess volume, dimethyl formamide, interferometer, sound velocity, viscosity molecular interaction

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Antidiabetic activity of alcoholic leaves extract of Alangium lamarckii Thwaites on streptozotocin-nicotinamide induced type 2 diabetic rats

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Asian Pacific Journal of Tropical Medicine 2011年第11期4卷 904-909页

作者： Rajesh kumar Dinesh kumar Pate Satyendra Kuldip Prasad Kirshnamurthy Sairam siva Hemalatha Department of Pharmaceutics Institute of TechnologyBanaras Hindu UniversityVaranasi-221005India

Objective:To investigate antidiabetic potential of alcoholic leaves extract of Alangium lamarekii (***) on streptozotocin-nicotinamide induced type 2 diabetic ***:Oral glucose tolerance test was done by inducing hyperglycemic state via administration of glucose in water(2 g/kg).Single dose of alcoholic leaves extract ***(250 and 500 mg/kg,p.o.) were administered to normoglycemic,hyperglycemic *** 2 diabetes was induced by single intraperitoneal injection of nicotinamide(110 mg/kg) followed by streptozotocin(65 mg/kg).The study also included estimations of blood plasma glucose,lipid profile,liver glycogen,body weight and antioxidant status in normal and diabetic ***:Admistration of alcoholic extract of *** at two dosage 250 and 500 rag/kg,*** not showed any significant change in blood glucose level of normoglycemic rats(P>0.05).whereas,oral glucose tolerance test depicted reduction in blood glucose level(P<0.05).The streptozotocin-nicotinamide induced diabetic rats, significantly decreased the blood plasma glucose level(P<0.001) comparable to glibenclamide (10 mg/kg),restored the lipid profile and showed improvement in liver glycogen,body weight and antioxidant status in diabetic ***:Present finding demonstrated the significant antidiabetic activity of alcoholic leaves extract ***.

关键词： Alangium lamarckii Antidiabetic activity Glucose tolerance test Streptozotocin

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Elucidating the role of gut microbiota dysbiosis in hyperuricemia and gout:Insights and therapeutic strategies

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World Journal of Gastroenterology 2024年第40期30卷 4404-4410页

作者： Abhay kumar Singh siva Sundara kumar Durairajan Ashok Iyaswamy Leonard L Williams Department of Microbiology School of Life SciencesCentral University of Tamil NaduTiruvarurTN 610005India School of Biomedical Sciences Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong 999077China School of Chinese Medicine Hong Kong Baptist UniversityHong Kong 999077China Department of Biochemistry Karpagam Academy of Higher EducationCoimbatore 641021India Center for Excellence in Post-Harvest Technologies North Carolina Agricultural and Technical State UniversityGreensboroNC 27411United States

Hyperuricemia(HUA)is a condition associated with a high concentration of uric acid(UA)in the bloodstream and can cause gout and chronic kidney *** gut microbiota of patients with gout and HUA is significantly altered compared to that of healthy *** article focused on the complex interconnection between alterations in the gut microbiota and the development of this *** studies have suggested that changes in the composition,diversity,and activity of microbes play a key role in establishing and progressing HUA and gout ***,we discussed how the gut microbiota contributes to HUA through purine metabolism,UA excretion,and intestinal inflammatory *** examined specific changes in the composition of the gut microbiota associated with gout and HUA,highlighting key bacterial taxa and the metabolic pathways ***,we discussed the effect of conventional gout treatments on the gut microbiota composition,along with emerging therapeutic approaches that target the gut microbiome,such as the use of probiotics and *** also provided insights into a study regarding the gut microbiota as a possible novel therapeutic intervention for gout treatment and dysbiosis-related diagnosis.

关键词： Gut microbiota Dysbiosis Gout Hyperuricemia Inflammation Intestinal barrier Probiotics Prebiotics Fecal microbiota transplantation

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