SMC PROTOCOL FOR DISTRIBUTED K- ANONYMITY

Secure multiparty protocols have been proposed to enable non colluding parties to cooperate without a trusted server. Even though such protocols put off information exposé other than the objective function, they are quite costly in computation and communication. The high overhead motivates parties to estimate the utility that can be achieved as a result of the protocol beforehand. To avoid this issue we propose a look-ahead approach, specifically for secure multiparty protocols to achieve distributed k-anonymity, which helps parties to decide if the utility benefit from the protocol is within an acceptable range before initiating the protocol. The look-aheadoperation is highly localized and its accuracy depends on the amount of information the parties are willing toshare. Experimental results show the effectiveness of the proposed methods

A New Hybrid Artificial Neural Network Based Control of Doubly Fed Induction Generator

In this paper, Hybrid Artificial Neural Network (ANN) with Proportional Integral (PI) control technique has been developed for Doubly Fed Induction Generator (DFIG) based wind energy generation system and the performance of the system is compared with NN and PI control techniques. With the increasing use of wind power generation, it is required to instigate the dynamic performance analysis of Doubly Fed Induction Generator under various operating conditions. In this paper, three control techniques have been proposed, the first one is using PI controller, the second one is ANN control, and the third one is based on combination of ANN and PI. The performance of the proposed control techniques is demonstrated through the results, determined by using MATLab/Simulink. From the results it is observed that the dynamic performance of the DFIG is improved with the Hybrid control technique

Predictive Direct Torque Control Strategy for Doubly Fed Induction Machine for Torque and Flux Ripple Minimization

The main drawback of Direct Torque Control (DTC) or Direct Power Control (DPC) is non-constant switching frequency; this drawback can be eliminated by employing predictive DTC. The predictive DTC technique is employed without much complicated online calculations by simply implementing constant switching times for active rotor voltage vectors to reduce torque and flux ripples and achieve constant switching frequency. The predictive DTC strategy has been implemented for RSC of Doubly Fed Induction Machine (DFIM). The performance of the proposed control methodology is compared with the classical DTC method under various operating conditions such as step change in torque, continuous variation of torque command, and the performance of DFIM near synchronous speed. It is found that the performance of the proposed predictive DTC strategy of DFIM is quite good compared to classical DTC strategy

Rotor Flux Reference Generation Control Strategy for Direct Torque Controlled DFIG

The wind turbines based Doubly Fed Induction Generator (DFIG) is not able to support the voltage and the frequency of the grid during and immediately following the grid failure. This would cause major problems for the systems stability, but the turbines should stay connected to the grid in case of a failure. This can be achieved by using crowbar protection in particularly during voltage dips. When low depth voltage dips occur, the necessity of crowbar protection can be eliminated by using proposed Direct Torque Control (DTC), with a proper rotor flux generation strategy, by which during the fault it will be possible to maintain the machine connected to grid, generating power from the wind, reducing the stator and rotor over currents, eliminating the torque oscillations that normally produce such voltage dips and fast dynamic response accompanies the overall control of the wind turbine. In this chapter, the DFIG performance is analyzed and the results are presented for with proposed control strategy with and without voltage dip, without control strategy with voltage dip, and control strategy during longer voltage dip

Hall Current Effects on MHD Convective Flow Past a Porous Plate with Thermal Radiation, Chemical Reaction and Heat Generation/Absorption

In this paper an attempt is made to study the chemical reaction and combined buoyancy effects of thermal and mass diffusion on MHD convective flow along an infinite vertical porous plate in the presence of Hall current with variable suction and heat generation. A uniform magnetic field is applied in a direction normal to the porous plate. The equations governing the fluid flow are solved using the perturbation technique and the expressions for the velocity, the temperature and the concentration distributions have been obtained. Dimensionless velocity, temperature and concentration profiles are displayed graphically for different values of the parameters entering into the problem like Prandtl number Pr, Hartmann number M, Grashof number G, modified Grash of number Gc, Hall parameter m, Heat source parameter χ, Schmidt number Sc, and Chemical reaction parameter ξ. The Skin-friction coefficient, rate of heat transfer and mass transfer at the plate have been obtained and also discussed through tables. It has been observed that an increase in the Prandtl number leads to a decrease in the primary and secondary velocities, and also a decrease in the temperature. The primary and secondary velocities decrease with increase in the Chemical reaction parameter or Magnetic field parameter

A STUDY OF STOOL SAMPLE FROM HIV POSITIVE AND HIV NEGATIVE AT ANDHRA PRADESH.

 Objective: The objective of this study is to investigate the variations, if any, in the types of intestinal parasites in HIV-positive and HIV-negative individuals.Methods: For their HIV status in our laboratory by enzyme-linked immunoasorbant assay and TRIDOT, sample stool, macroscopic and microscopic examination, formal-ether concentration technique f, saline wet mount, iodine wet mount, modified acid-fast stain. Results: For the purpose of statistical analysis, the enteric parasites are divided into the coccidian group (Cryptosporidium+Isospora belli) and conventional enteric parasites (Entamoeba histolytica, Giardia intestinalis, and Ascaris lumbricoides), and enteric parasitic infection is more common in HIV-positive patients with diarrhea than HIV-positive patient without diarrhea or HIV-negative individuals.Conclusion: The study period of 1 year and 8 months revealed that it is difficult to locate/identify a HIV-positive person in a place like Kadapa on account of confidentiality/lack of awareness among the population. Detection of intestinal parasites is 17.3% in HIV-positive patients and 12% in HIV-negative individuals

PREVALENCE OF FUNGAL IN OPPORTUNISTIC INFECTION HIV TYPE-1 IN SUBURBAN, KADAPA

Objective: Isolate fungal element causing in opportunistic infection of human immunodeficiency virus and correlated with CD4 cell counts.Methods: Different samples are used and media: Sabouraud dextrose agar, using mycological methods such as potassium hydroxide, lactophenol cotton blue mount, India ink preparation, and Gram-staining.Results: Both bacterial and fungal isolates were obtained from 8 cases. Pneumococci and Candida spp. were observed in 3 cases followed by Staphylococcus aureus and Aspergillus in 2 cases, Klebsiella pneumoniae and Geotrichum spp., Pneumococci and Penicillium spp., and Acinetobacter baumannii, and Cryptococcus spp. from 1 case each. Only fungal isolates were obtained from 6 cases of sputum samples. Candida spp. (50%) were predominant fungal isolate followed by Aspergillus spp. (33.33%) and Cryptococcus spp. (16.66%). Cryptococcus spp. was the predominant fungal isolate (66.6%) followed by Candida pseudotropicalis (Kefyr) in 16.66% (1/6) and Acinetobacter spp. was isolated from 16.66 % (1/6).Conclusion: Respiratory infections were the predominant manifestations comprising chronic bronchitis, pneumonia, chronic obstructive pulmonary disease, and chronic cough. 66 individuals were with respiratory symptoms, of them 28 individuals had CD4 count 50-200/mm3, 22 had CD4 <50/mm3

A STUDY OF URINE FROM HIV-POSITIVE AND HIV-NEGATIVE INDIVIDUALS AT ANDHRA PRADESH

Objective: The aim of this study is to investigate the variations, if any, in urinary bacterial pathogens in HIV-positive and HIV-negative individuals.Methods: Urine sample, macroscopic and microscopic examination for identification of bacteria use by method of Standard loop method, using identification methods, Grams-staining, Biochemical tests.Results: Out of 75 HIV-positive males, 52 males were married, 23 males were unmarried; risk factors are sexually 28, occupationally majority were labor, 31, age group more in 19-25 age, only 9 HIV-positive patients presented with symptoms of urinary tract infection, Escherichia coli was the most frequently occurring bacterial isolate from positive urine culture followed by Klebsiella spp.Conclusion: The study period of 1 year and 8 months revealed that it is difficult to locate/identify an HIV-positive person in a place like Kadapa on account of confidentiality/lack of awareness among the population. Having identified the HIV-positive cases, collection of urine samples from the patients also needed counseling and intervention by the respective clinicians, especially when patients were not having any symptoms. Out of 50 HIV-negative individuals, only 1 (2%) urine sample is showing significant bacteriuria

A Comparative study of oxidant and Anti-oxidant parameters in Chronic Renal Failure, Haemodialysis (Pre &Post) and Controls

Chronic kidney disease (CKD) is featured by a progressive decline of kidney function and is mainly caused by chronic diseases such as diabetes mellitus and hypertension. CKD is a complex disease due to cardiovascular complications and high morbidity; however, there is no single treatment to improve kidney function in CKD patients. Since biological markers representing oxidative stress are significantly elevated in CKD patients, oxidative stress is receiving attention as a contributing factor to CKD pathology. Aim of our study is comparison of oxidant and anti oxidant parameters in chronic renal failure, Hemodialysis (pre and post) and control subjects. Materials and Methods: The present study was conducted on a patient group comprising of 50 patients diagnosed with CRF, 50 were pre hemodialysis, 50 were post hemodialysis (MHD). This patient group was compared to a healthy group including 100 controls. All the study participants were admitted in the department of Medicine [Nephrology department] at “Fathima Institute of Medical Sciences”, Kadapa. Andhra Pradesh. India. The obtained serum samples were used for biochemical analysis for estimating MDA, vitamin A and Glutathione Peroxidase (GPx). Conclusion: Our results reflects the primary mechanisms of oxidative stress and inflammation during hemodialysis which may cause of CVD development in hemodialysed patients

Optimized Design of Axially Symmetric Cassegrain Reflector antenna using Iterative Local Search Algorithm

Dual reflector antennas are considered as pencil beam antennas that can produce radiation identical to searchlight beams. As compared with front-fed configuration, design of dual-reflector geometry is complicated since the parameters like feed location, sub reflectorsize, required taper on sub reflector, selection of focal length to diameter ratio of the main reflector, amplitude distribution provided by feed etc. are to be adjusted as per the given specifications. Also the side lobe suppression effort requires the antenna to be designed for minimum sub reflector blockage. The design of such a cassegrain reflector is considered for the minimum blockage condition. Along with the parameters like high gain and low cross-polarization; low VSWR is also one of the prenominal parameter that can be achieved. The optimized values of f/Dand angle subtended by the sub reflector is obtained by using Iterative Local Search algorithm. For obtaining the radiation diagrams, ‘Induced Current Analysis of Reflector Antenna’ and GRASP soft wares are used. This will help us to identify the factors that affect the radiation pattern of the antenna