Building Mobile Agents’ Applications Fault Tolerant

Preeti,Praveena Chaturvedi 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.5

A mobile agent is self-governing software that has one or more goals and can migrate from one node to another in a network. Mobile agent has received pervasive interest in both research and academia in recent years because of its support for asynchronous and disconnected operation capability in distributed system Along with these affirmative sides, the full scale adoption of mobile agent has been delayed by several fault tolerance complexities in untrustworthy network environments such as Internet. This paper proposed a framework to provide fault tolerant execution to mobile agents. Key concepts used to accomplish this goal include the transaction manager concept, checkpointing, timeout mechanism. Agent saves partial results at home server. The framework can tolerate agent failure, server failure and communication delay. It has been implemented as an add-on to mobile agent platform called Aglets. Experiments have been conducted to test the feasibility and performance of the proposal.

Intra-Operative Frozen Sections: Experience at A Tertiary Care Centre

Preeti, Agarwal,Sameer, Gupta,Kulranjan, Singh,Abhinav, Sonkar Arun,Preeti, Rani,Sunita, Yadav,Mati, Goel Madhu Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12

The present study was conducted to assess error rates with diagnosis using intra-operative frozen sections, and to indicate ways to increase overall performance. Over a period of two years, 227 cases were biopsied intra-operatively. Errors were observed in 14 cases. Four of these were sampling errors, one by a pathologist and three by surgeons. In seven cases incorrect interpretations were made. Epithelial dysplasia was observed on definitive histology in two cases which was not reported intra-operatively. One case was of ectopic thyroid. In cases of oral cancer where sentinel lymph nodes were sampled, immunohistochemistry for cytokeratin was performed to facilitate identification of micrometastasis. Only single case displayed tumor deposits which was not evident morphologically. Resection margins were reported in seventy eight cases. Some 18% (14/50) benefited from revision of margins; overall sensitivity of intra-operative frozen sections for marginal status was 71.4%, with a specificity of 90.3%. Overall sensitivity was 75% and specificity was 97.5%. Careful observation, pathologist experience and knowledge of limitations help in improving the overall diagnostic outcome.

Numerical solution of free stream MHD flow with the effect of velocity slip condition from an inclined porous plate

Preeti Kaushik,Upendra Mishra 장전수학회 2022 Advanced Studies in Contemporary Mathematics Vol.32 No.3

This article is concerned with Magnetohydrodynamic forced convective boundary layer flow past an inclined plate in a porous medium. Additionally the effect of heat generation and velocity parameter. The velocity slip and thermal slip effects on velocity and temperature profiles are taken into the account to address the phenomenon of heat transfer. The fundamental system of partial differential equations with necessary boundary conditions are converted into nonlinear ordinary differential equations. The reduced ordinary differential equations are solved numerically by the Runge-Kutta method of fourth-order. It is observed that the results are significantly influenced by the various dimensionless parameter such as magnetic parameter, Grashof number, Heat generation parameter, Prandtl number, and velocity slip parameter. The impact of pertinent physical quantities on velocity and temperature profile is presented through graphs and tables. The results depicted that Magnetic and porous parameters have the propensity to decrease the velocity profile. Velocity slip condition causes a drop in velocity distribution and reverse behavior is observed for temperature profile.

Right sided descending and sigmoid colon: its embryological basis and clinical implications

Preeti Shrivastava,Anita Tuli,Sohinder Kaur,Shashi Raheja 대한해부학회 2013 Anatomy & Cell Biology Vol.46 No.4

Anatomical variations of the colon are described by various authors, but the occurrence of right sided descending and sigmoid colon is rare and has not been reported. We found that the anomalous right-sided descending and sigmoid colon had four parts. The proximal segment of the first part consisted of the descending colon extending across the midline from the splenic flexure to the portion supplied by the left colic artery. The distal segment was supplied by the superior sigmoid artery. The second and third parts formed a loop in the right lumbar region anterior to the lumbar cecum. The fourth part was in the lesser pelvis, extending from right sacroiliac joint to the third sacral body. Parts two, three, and four were supplied by the inferior sigmoid artery, which arose from the right side of the inferior mesenteric artery. The ascending and transverse colon was normally placed. This is a rare anomaly that has not been reported so far in adults and is of immense importance to interventional radiologists and colorectal surgeons. The embryological basis of such an anomaly is defective fixation occurring as early as the 12th-17th week of intrauterine life.

Dielectric and Electro-Optical Properties of Ceramic Nanoparticles Doped Liquid Crystals

Preeti Porov,Vishal Singh Chandel,Rajiv Manohar 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.2

Liquid crystals are important materials because of their applications in display technology and many other scientific applications. Different mixtures of liquid crystals and their doped samples have gained interest because a single liquid crystal compound cannot fulfill all the required parameters for the display application. The doping can be accomplished with dyes, polymers, or composite nanoparticles among other substance. The addition of nanoparticles can modify the physical properties of the host liquid crystal and enhances the performance of electro-optical devices. The present study is focused on investigations of possible changes in dielectric and electro optical properties of liquid crystals caused by doping with ceramic nanoparticles. Including smaller nanoparticles were found to be better candidates for use in suppressing the unwanted ion effects in liquid crystal displays.

Computation of design forces and deflection in skew-curved box-girder bridges

Preeti Agarwal,Priyaranjan Pal,Pradeep Kumar Mehta 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.3

The analysis of simply supported single-cell skew-curved reinforced concrete (RC) box-girder bridges is carried out using a finite element based CsiBridge software. The behaviour of skew-curved box-girder bridges can not be anticipated simply by superimposing the individual effects of skewness and curvature, so it becomes important to examine the behaviour of such bridges considering the combined effects of skewness and curvature. A comprehensive parametric study is performed wherein the combined influence of the skew and curve angles is considered to determine the maximum bending moment, maximum shear force, maximum torsional moment and maximum vertical deflection of the bridge girders. The skew angle is varied from 0° to 60° at an interval of 10°, and the curve angle is varied from 0° to 60° at an interval of 12°. The scantly available literature on such bridges focuses mainly on the analysis of skew-curved bridges under dead and point loads. But, the effects of actual loadings may be different, thus, it is considered in the present study. It is found that the performance of these bridges having more curvature can be improved by introducing the skewness. Finally, several equations are deduced in the non-dimensional form for estimating the forces and deflection in the girders of simply supported skew-curved RC box-girder bridges, based upon the results of the straight one. The developed equations may be helpful to the designers in proportioning, analysing, and designing such bridges, as the correlation coefficient is about 0.99.

Impact analysis of neem kernel extracts on the developmental profile of Anopheles stephensi

Preeti Sharma,Lalit Mohan,C.N. Srivastava 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.1

evaluation of the larvicidal effi-cacy ofAgeratum conyzoides,Argemone mexicanaand Azadirachta indicawas carried out againstAno-pheles stephensito develop an effective ecofriendlyinsecticide of plant origin. The methanol extract ofA. indicawas observed remarkably active with LC50values 18.2 and 13.1 ppm after 24 and 48 hours ofexposure. Petroleum ether extracts ofAg. conyzoideswith LC50 425.6 and 267.9 pm, carbon tetra chlo-ride extract ofAr. mexicanawith LC50 313.2 and240.3 ppm and petroleum ether extract ofAz. indicawith LC50 189.1 and 53. 5 ppm after 24 and 48hours of exposure were also found effective. Theimpact of Az.indica methanol extract on the lifecycle of malaria vector was further observed. Me-thanol extract of Az.indica causes deformities indifferent developmental stages of the malaria vector.Total developmental period was also extended from10 to 15 It remarkably influenced hatching rates,larval-pupal transformation and development, adultemergence and growth index. Larval and pupalKey words An. stephensi, Ageratum, Argemone,Azadirachta, phytoextract, metamorphosis, larvicide.

Growth Inhibitory Nature of Artemisia annua Extract against Culex quinquefasciatus (Say)

Preeti Sharma,Lalit Mohan,C.N. Srivastava 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.4

Petroleum ether (Pee), carbon tetrachloride (Cte) and methanol extract (Mee) of Artemisia annua, Chenopodium album and Sonchus oleraceus were screened for their efficacy against Culex quinquefasciatus larvae. Pee of A. annua, Mee of A. annua and Ch. album, Cte of A. Annua were found effective in descending order after 24 and 48 hrs of treatment. Pee of A. annua, the most potent extract with LC50 78.2 ppm was selected to study its influence on the development and metamorphosis of the culicine mosquito. The extract significantly affected the hatching, larval development, pupal transformation and also lengthened the larval and pupal periods. Growth index was remarkably reduced. Treated culicine eggs, larvae and pupae showed deformities including disruption of the body wall, distorted alimentary canal, damaged tracheal network and arrested histogenesis. The extract has remarkable effect on the metamorphosis and high larvicidal potential, hence, can be used as an effective alternative to the existing synthetic pesticides for the control of Cx. quinquefasciatus.

Management of Radiation Injuries by Panax ginseng Extract

Preeti Verma,Swafiya Jahan,Tae Hawn Kim,Pradeep Kumar Goyal 고려인삼학회 2011 Journal of Ginseng Research Vol.35 No.3

Chemical radiation protection is an important strategy to protect living beings against the deleterious effects of radiation. In the present study, the radioprotective effect of hydro-alcoholic extract of Panax ginseng extract (PGR-HAE) was studied on radiation-induced deleterious alterations in Swiss albino mice. Oral administration of such extract (25 mg/kg b wt/day/animal) for 5 consecutive days, half an h. before whole-body exposure to 6 Gy gamma radiation, enhanced the 30 days survival and also inhibited the radiogenic sickness, weight loss and life shortening. PGR-HAE ameliorated radiation induced depletion in blood constituents at different necropsy intervals between 12 h to 30 d, and significantly increased the number of femoral spleen colony forming units that survived after irradiation. Furthermore, it checked depletion of glutathione and antioxidant enzymes (superoxide dismutase, catalase, and glutathione S-transferase) as well as elevation of lipid peroxidation (LPO) level in blood and liver. The significant reduction in the yield of LPO demonstrates that PGR-HAE protects the membranes against radiation-induced oxidative damage. These findings conclude that such plant extract provides significant radioprotection, and it may be potentially valuable in the prevention of injuries caused during planned and unplanned radiation exposure.

Role of Photosensitization of Certain Phytotoxins in the Management of Culex quinqueasciatus

Preeti Sharma Rawat,Lalit Mohan,C. N. Srivastava 한국응용곤충학회 2005 한국응용곤충학회 학술대회논문집 Vol.2005 No.05