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An access control mechanism in a user hierarchy is used to provide the management of sensitive information for authorized users. The users and their own information can be organized into a number of disjoint sets of security classes according to their responsibilities. Each security class in a user hierarchy is assigned an encryption key and can derive the encryption keys of all lower security classes according to predefined partially ordered relation. In 2006, Jeng and Wang proposed an efficient key management scheme based on elliptic curve cryptosystems. This paper, however, pointed out that Jeng–Wang scheme is vulnerable to the so-called compromising attack that the secret keys of some security classes can be compromised by any adversary if some public information modified. We further proposed a secure key management scheme based on elliptic curve cryptosystems to eliminate the pointed out the security leak and provide better security requirements. As compared with Jeng and Wang’s scheme (Jeng and Wang, 2006), the proposed scheme has the following properties. (i) It is simple to execute the key generation and key derivation phases. (ii) It is easily to address dynamic access control when a security class is added into or deleted from the hierarchy. (iii) It is secure against some potential attacks. (iv) The required storage of the public/secret parameters is constant.

This study aims to predict spatial distribution of deforestation and detects factors influencing forest degradation of Northern forests of Ilam province. For this purpose, effects of six factors including distance from road and settlement areas, forest fragmentation index, elevation, slope and distance from the forest edge on the forest deforestation are studied. In order to evaluate the changes in forest, images related to TM1988, ETM+2001 and ETM+2007 are processed and classified. There are two classes as, forest and non-forest in order to assess deforestation factors. The logistic regression method is used for modeling and estimating the spatial distribution of deforestation. The results show that about 19,294 ha from forest areas are deforested in the 19 years. Modeling results also indicate that more deforestation occurred in the fragmented forest cover and in the areas of proximity to forest/non forest edge. Furthermore, slope and distance from road and settlement areas had negative relationships with deforestation rates. Meanwhile, deforestation rate is decreased with increase in elevation. Finally, a simple spatial model is presented that is able to predict the location of deforestation by using logistic regression. The validation was also tested using ROC approach which was found to be 0.96.

The aim is to show through two clinical cases an anatomical variability of the cystic duct. The first clinical case of a patient admitted for endoscopic treatment of the main bile duct lithiasis while cholangiography had objectively dilated the cystic duct over its entire length, it was very low implanted in pre-papillary with the presence of a lacunar image evoking a vesicular infundibulum lithiasis. The second clinical case of a patient admitted for endoscopic retrograde cholangio pancreatography and extraction of a millimetric lithiasis of the main biliary tract visualized on the biliary Magnetic Reasoning Imaging, whereas retrograde cholangiography objectified: a thin main biliary tract and a cystic duct measuring 4 mm, long and low implanted with a doubt on a lacunar image. The anatomical variability of the cystic duct is not uncommon, therefore detailed knowledge of all these anatomical variations is essential to avoid iatrogenic lesions of the bile ducts.

An ad-hoc network is a collection of mobile nodes, which communicate over radio. These networks have an important advantage; they do not require any existing infrastructure or central administration. Therefore, mobile ad-hoc networks are suitable for temporary communication links. This flexibility, however, comes at a price: communication is difficult to organize due to frequent topology changes. Routing in such networks can be viewed as a distributed optimization problem. A new class of algorithms, inspired by swarm intelligence, is currently being developed that can potentially solve numerous problems of modern communications networks. These algorithms rely on the interaction of a multitude of simultaneously interacting agents. A survey of few such algorithms for ad hoc networks is presented here.

Background of the study: As in a global village and English has been widely used in medical terminology, medical records and in professional communication, it’s quite essential to have good English ability for those people standing in the front line of healthcare, in particular, the nurses. Objective: The present study was aimed to assess the level of anxiety related to English Anxiety among GNM students. Methodology: A descriptive research design was used for the present study. A total of 200 students were selected by using Complete Enumeration sampling technique. A modified tool on Foreign Language Classroom Anxiety Scale (FLCAS) was used to collect data. Results: The results of the present study revealed that most of the students reported moderate English Language Anxiety especially in writing English. Further, both boys and girls had shown moderate English Language Anxiety and the level of anxiety was found to be higher among girls than boys. The level of anxiety in five components (Speaking, Listening, Reading, Writing and Grammar) was same among all the students of 1st Year, level of English Language Anxiety in Listening component was higher among girls than boys studying in 2nd year, level of English Language anxiety in reading as well as grammar component was higher among girls than boys studying in 3rd year and level of English Language anxiety in Listening component was higher among girls and level of English Language Anxiety was higher in writing component among boys studying in GNM Internship. Conclusion: Teachers should have learning activities where these students are given more guidance on how to talk or write about themselves, their family, their interests and their culture. In addition, teachers should also try to create a non-threatening, relaxed learning environment in which students can take risks and make mistakes without fear or embarrassment. In addition, teachers must make a conscious effort to ensure that these students must have the opportunity to participate in class. Key words: Anxiety, English language, FLCAS, English language anxiety.

According to the United Nations, there were approximately 4.854 million international students registered around the world in 2016. While the mentioned figure was equal to 3.961 million in 2011 [1]. Educational migration is an increasing trend, which brings various benefits to the host countries. Georgia began attracting foreign youth representatives as soon as it started experiencing optimistic economic trends. The growing number of foreign students has had a noticeable, positive impact on the economy and thus, has become a subject of discussion in the society. The present article is dedicated to discussing general characteristics of Georgian immigration profile (such as statistics concerning immigrants) and observing details of students' migration to the mentioned state. Additionally, the work examines diverse recommendations that could increase the number of prospective international students in the country. Analyzing some aspects of the youth immigration to Georgia is a safe mean of acknowledging the realities of Georgian educational sector and finding prospects of further development. Due to the importance of the theme, the article discusses some of the relevant recent researches and statistical data that have been published by various international and local, Georgian institutions.

A dynamic graphical display and regression diagnostics is proposed for examining the validating assumption of the error term in a multiple regression modeling. Residual plots were used to detect the regression assumption of homocesdasticity tendency. Independence of the error term was diagnosed through Durbin Watson Test statistic or scatter plots of residuals against time order. Letter value displays were used to detect approximate normality through mid-summaries values. The error term validation were characterized with the residuals following an even distribution of scatter plots along a horizontal line through zero point, high (r2), minimal standard error of estimates for the predictors, the Cp statistic close to P+1 which means a small biased, the P value less than 0.05(level of significant), and lack of bivariate high correlations among the predictors

This work focuses on the management of biomedical waste at the University Hospital Center for Mother and Child - Lagune of Benin wich exhibits deficiencies in compliance with regulations. The study aims to comprehensively assess all stages of solid waste management, including collection, transportation, conditioning, storage, treatment, and final disposal. Weaknesses in waste management are evident, encompassing insufficient trash cans, garbage mixing, incinerator malfunctions, and a lack of training for most hygiene and purification personnel. Furthermore, the study conducted physical and chemical analyses on the wastewater discharged from both the laundry and the wastewater treatment plant (WWTP) into the Cotonou lagoon. Field measurements were taken for physical parameters using a multiparameter measuring device. The suspended solids were determined through filtration, and nitrates and nitrites were quantified using the Nessler and Zambelli methods, respectively. BOD (Biochemical Oxygen Demand) was assessed using a BOD meter, while COD (Chemical Oxygen Demand) was determined through oxidation with potassium dichromate. The analysis results for the laundry's wastewater revealed COD levels of approximately 146 mg/L, BOD5 at 62 mg/L, and suspended solids at 63.74 mg/L. These values, exceeding Benin's standards, raise concerns about the potential impact of discharging these waters into the Cotonou lagoon. It is imperative that these wastewater streams be directed to a treatment station before being released into the lagoon.

For some time now, researchers in pedagogy have been finding ways of improving language teaching and learning in schools in Africa. In Ghana, various governments have sought assistance/cooperation from professional as well as donor agencies, both national and international, to improve language teaching methodology in schools. Until then, language teaching in the basic schools had depended rather extensively on the ‘Segregated Method’. With the coming of these interventions, however, teachers are becoming more and more aware of the ‘Integrated Approach’ to teaching language. Even then, the focus has been on what is popularly referred to as ‘Language across the Curriculum’. This paper seeks to reinforce the fact that language is better learned as a whole, and that students of ESL learn better when the various language skills are integrated in a single lesson, and that there is no single ‘best method’ of teaching English.

The desire for political power leads people into politics. Many people come to power in order to influence the formulation and implementation of economic and political ideas which they believe will solve the problems bedeviling their nations. In providing political leadership, use of language is of utmost importance because it facilitates the execution of many political actions. This paper discusses political discourse by examining the inaugural addresses of Presidents J. F. Kennedy and Richard M. Nixon. Inaugurals usually point towards the policy directions of newly inaugurated leaders. The position of the United States of America as a very strong political and economic power makes the speeches of its president incontrovertibly significant. This paper aims at examining the rhetorical strategies of the two presidents whose ideologies are anything but identical.