Software Aging Analysis of Web Server Using Neural Networks

Software aging is a phenomenon that refers to progressive performance degradation or transient failures or even crashes in long running software systems such as web servers. It mainly occurs due to the deterioration of operating system resource, fragmentation and numerical error accumulation. A primitive method to fight against software aging is software rejuvenation. Software rejuvenation is a proactive fault management technique aimed at cleaning up the system internal state to prevent the occurrence of more severe crash failures in the future. It involves occasionally stopping the running software, cleaning its internal state and restarting it. An optimized schedule for performing the software rejuvenation has to be derived in advance because a long running application could not be put down now and then as it may lead to waste of cost. This paper proposes a method to derive an accurate and optimized schedule for rejuvenation of a web server (Apache) by using Radial Basis Function (RBF) based Feed Forward Neural Network, a variant of Artificial Neural Networks (ANN). Aging indicators are obtained through experimental setup involving Apache web server and clients, which acts as input to the neural network model. This method is better than existing ones because usage of RBF leads to better accuracy and speed in convergence.Comment: 11 pages, 8 figures, 1 table; International Journal of Artificial Intelligence & Applications (IJAIA), Vol.3, No.3, May 201

Language and Life in Sangam Literature

The development of the language is the development of the society and the race. Two thousand years ago, the people of the world were engaged in the search for food but the Tamil people formed an association unlike any other language in the world, and through that association they developed themselves, their dependents and helped the poor. The life of Tamil people is linked with the development of Tamil language. Three association were established with headquarters at Madurai and the books composed by many poets were staged in that association. Agathiyar was the chief scholar of the first association. After him more than five hundred poets explored Tamil. The lives of Tamil peopke are intertwined with these associations. It is true that the Tamil society has also developed with the development of the language. Nakkirar, who wrote a review for Iraiyanaar Kalaviyal expounded the three truths. In the first association the kings, chief poets and common people were members. Overall, the article deals about the life style, language and about the the three association of Tamil people

Moral Ideas in Manimegalai

Every period record different types of moral ideas. The special characteristics of morality is found in Tamil literature. There are moral messages in other literature too. Manimegalai is filled with moral ideas. As Manimegalai is a Buddhist scripture, the teachings of virtue and emphasis on virtue is must. Moral ideas are explained in Manimegalai through small short stories. The moral ideas in Manimegalai are very useful. Virtuous actions are necessary for human beings to acquire the best qualities. Likewise, moral thinking is necessary for a man to develop himself to the highest level, to remove bad behavior from him and to become a saint. Human cannot survive without love and virtue. Love and virtue should be the fundamental trait among the people. Manimegalai teaches about the bad qualities found in human beings such as murder, theft, lying and tells people to follow good qualities such as helping the poor and so on. Thus, Manimegalai teaches moral ideas to people and even in today’s education system moral ideas are given important

Bulk AlN single crystal growth on foreign substrate and preparation of free-standing native seeds

Physical vapour transport growth of aluminium nitride (AlN) single crystals on silicon carbide (SiC) substrates has been optimised and crack-free, large-area, free-standing (0001) AlN wafers were prepared from the grown template crystals. 28 mm diameter single crystals without any polycrystalline surroundings were obtained. Different off-oriented substrates give rise to different growth modes. Sharp and symmetric line shapes of X-ray diffraction (XRD) rocking curves and high intense Raman phonon mode peaks prove high structural quality and homogeneity of the grown crystals. Full width at half maximum of the rocking curves is 72 arcsec for symmetric 00.2 reflection and 200 arcsec for asymmetric 10.3 reflection, representing a low screw as well as edge type threading dislocations. Wet chemical etching results also confirm the above XRD results and the estimated etch pit density is as low as 2-5 x 10(5) cm(-2). The growth surfaces of all the crystals show only Al-polarity as inferred by the etching analysis. The concentration of silicon and carbon impurities incorporated from the SiC substrate decreases with the growth length of the AlN crystals. These impurities might play a decisive role in determining the optical properties of the crystal and be responsible for the absence of near-bandgap excitonic luminescence. Confocal Raman spectra show only the phonon modes allowed by the selection rules for the measured symmetry. The observed E-2(high) phonon mode frequency very closely matches the reported stress-free phonon frequency of AlN. This work demonstrates that AlN templates prepared on SiC as a foreign substrate can be used as native seeds for the growth of further homo-epitaxial layers and crystalline boules

Transport in Luttinger Liquids

We give a brief introduction to Luttinger liquids and to the phenomena of electronic transport or conductance in quantum wires. We explain why the subject of transport in Luttinger liquids is relevant and fascinating and review some important results on tunneling through barriers in a one-dimensional quantum wire and the phenomena of persistent currents in mesoscopic rings. We give a brief description of our own work on transport through doubly-crossed Luttinger liquids and transport in the Schulz-Shastry exactly solvable Luttinger-like model.Comment: Latex file, 15 pages, four eps figure

A prospective study on the role of umbilical artery doppler velocimetry in the perinatal outcome of growth restricted fetuses

Background: To compare pregnancy outcomes in growth-restricted fetuses retaining normal umbilical artery doppler flow and the outcomes of pregnancies with end-diastolic velocity diminished or severely reduced/absent.Methods: In a prospective observational study, one hundred pregnant women with growth-restricted fetuses were followed with doppler velocimetry of the umbilical artery between weeks 28 and 41 of pregnancy. Outcomes were compared for the normal doppler group (55%) (Group 1), the low-end diastolic flow group (32%) (Group 2), and the group with severely reduced or absent end-diastolic velocity waveforms (13%) (Group 3).Results: Fetuses with abnormal umbilical flow velocimetry had higher incidence of oligohydramnios (82.2%). The average birth weight and gestational age at delivery were lower in the abnormal doppler group. Significantly more women with severe reduction/AEDV, 31/45 (68.8%), underwent caesarean section, with 20 of them (44.4 %) for fetal distress, compared with 17/55 (30.9%) women in the normal doppler group, with 9 of them (16.4%) for fetal distress. Also, fetuses with abnormal umbilical artery velocimetry had early delivery at less than 36 weeks of gestation (38.2% versus 65.85%), increased NICU admission (32.7% versus 80%), need for PPV (5.5% versus 40%), low Apgar score (9.1 % versus 50.2%) than those with normal doppler. All the three stillbirths in the study population were in the abnormal doppler group.Conclusions: Umbilical artery doppler velocimetry helps in differentiating fetus with pathological growth restriction at risk for perinatal complications from small and healthy fetuses

PROTECTIVE ROLE OF METHANOLIC FLOWER EXTRACT OF ALLAMANDA NERIIFOLIA HOOK AGAINST 1, 4 DICHLOROBENZENE (DCB)-INDUCED HEPATOTOXICITY

The present study was conducted to evaluate the protective role of methanolic flower extract of Allamanda neriifolia on 1, 4 dichlorobenzene (DCB)-induced hepatotoxicity in rat model. 1,4 DCB administered rats (300mg/kg/b.wt which was dissolved in 1ml of corn oil by intraperitonial injection for 45 days) were pre treated with methanolic flower extract of Allamanda neriifolia (300 mg / kg body weight) for 45 days and sacrificed after 1,4 DCB intoxication. Results showed that 1,4 DCB caused a marked rise in serum alanine aminotransferase (ALT), total cholesterol (TC), as well as marked decrease in serum total protein (TP), albumin (ALB), PCV, WBC, RBC, Hemoglobin and platelet compared to controls. However pre treatment with A.neriifolia methanolic flower extract produced a significant decrease in the ALT and total cholesterol level and an increase in total protein, albumin and hematological parameters compared to DCB alone group. Taken these data together, it can be concluded that natural plant components such as A.neriifolia flowers could protect the liver against dichlorobenzene (DCB)-induced liver toxicity. Keywords: Allamanda neriifolia, 1, 4 Dichlorobenzene, methanolic extract, Hepatotoxicit