Global Domination Number of Squares of Certain Graphs

The square of a graph G= (V, E) is the graph G2 with the same vertex set as G and every two vertices u, v ϵ V are adjacent in G2 if and only if they are adjacent in G by a path of length one or two. Throughout this paper an attempt has been done to analyse the global domination of squares of certain graphs. We considered some connected graphs like paths, cycles, wheel graphs, complete tripartite, windmill graphs and some tree graphs. We characterised the global domination number of squares of a graph. We obtained a relationship between the global domination number of the square of some graphs and the domination number of the given graph. We also obtained the global domination number of squares of certain graphs. AMS Subject Classification: 05C6

Techniques for improving the performance of unsupervised approach to sentiment analysis

In this work, few techniques were proposed to enhance the performance of unsupervised sentiment analysis method to categorize review reports into sentiment orientations (positive and negative). In review reports, generally negations can change the polarity of other terms in a sentence. Therefore, a new technique for handling negations was proposed. As it is seen that, the positions of terms in a report are also important i.e. the same term appearing at different positions in a report may convey different amount of sentiments. Thus, a new technique was proposed to assign weights to the terms depending on their positions of occurrences within a review. Again, another technique was proposed to use the presence of exclamatory marks in the reviews as the effects of exclamatory marks are equally important in categorizing review reports. After incorporating all these concepts in the first phase of the proposed method, in the second phase, analysis of sentiment orientations was done using cluster ensemble method. The proposed method was tested on a state-of-the-art Movie review dataset and 91.75% accuracy was achieved. A significant improvement over some of the unsupervised and supervised methods in terms of accuracy was achieved with incorporation of the new techniques

Modulatory Effects of L- Tyrosine on Neurobehavioural Consequences of Combat Stress in Rats

The paper presents the results of a study conducted to elucidate tile potentiality of tyrosine, aprecursor of catecholaminergic neurotransmitters, against combat stress-associated behavioural changes and brain catecholamine status in an animal model. The results obtained showed that stressimpaired the performance on Morris water maze (MWM) in saline-injected rats and concurrentlylowered norepinephrine (NE) levels in brain. This could be due to decreased dopamine J3-hydroxylase(DBH) activity and increased monoamine oxidase (MAO) activity. On the contrary, there was asignificant improvement in post-stress performance in MWM test in animals receiving tyrosine.Stress-induced increase in catecholamine metabolites, homovanillic acid and vanillylmandelic acid inbrain was prevented by treatment with tyrosine. The present fmdings imply that precursor availabilitycould be a limiting factor to sustain intensified catecholamine synthesis during stress and hencesupplementation of L-tyrosine could be beneficial to improve performance during stres

Understanding Academic Stress among Adolescents

Any individual who progresses through life goes through various changes and transitions where ‘stress’ becomes invariably part of the journey. Adolescents are particularly vulnerable to the concept of academic stress as the transitions occur at an individual and social level. It, therefore, becomes imperative to understand the sources and impact of academic stress to derive adequate and efficient intervention strategies. This review aims to understand academic stress at a bio psychosocial level highlighting the impact and sources of academic stress. For the literature review, articles were collected from online databases such as EBSCO, ProQuest, Springer, PubMed, Jstor and Google Scholar. The literature search was done using keywords academic stress, academic anxiety, coping, physiological reactions of stress, academic performance, stress and mental health.The prevalence rate of stress varied from 15%-45% in studies conducted after 2000. The review examines stress and its physiological impact, cognitive and social influences, sources of stress detailing Indian findings

Stock assessment and management options for whelks along south-eastern Arabian Sea

Two species of whelks viz., Babylonia spirata and Babylonia zeylanica belonging to the family Buccinidae are commercially fished from Kollam, south-west coast of India, since early 1990’s and are exported from India under the trade name ‘Baigai’. The species is present all through the year in the fishing grounds, caught as by-catch in shrimp trawlers and is a targeted fishery from April to June, when more than 50% of the annual whelk catch is taken. B. zeylanica dominates the whelk catch (61% of the annual catch). The average catch rate in the modified trawlers for whelk was 400 kg unit-1 day-1. Following the von Bertalanffy growth function, asymptotic length and growth rate were estimated as 68.7 mm and 1.08 respectively for B. spirata and as 76 mm and 1.15 respectively for B. zeylanica. The L50 estimated for B. spirata and B. zeylanica were 35.2 and 41.7 mm respectively. The optimum length of capture and mean generation time were 40 mm and 0.55 years for B. spirata and 44 mm and 0.48 years for B. zeylanica respectively. The annual mean length of B. spirata showed an increase from 37.4 mm in 2001 to 40.1 mm in 2002 and multiple cohorts have been observed. The relative yield-per-recruit analysis shows that, present rate of exploitation of B. spirata has reached the optimum and that of B. zeylanica has nearly attained the optimum. The faster growth rate, early maturity and continuous breeding behaviour explain the sustained fishery of B. spirata and B. zeylanica under a high fishing pressure along Kollam coast