735 research outputs found
A Machine Learning Approach For Opinion Holder Extraction In Arabic Language
Opinion mining aims at extracting useful subjective information from reliable
amounts of text. Opinion mining holder recognition is a task that has not been
considered yet in Arabic Language. This task essentially requires deep
understanding of clauses structures. Unfortunately, the lack of a robust,
publicly available, Arabic parser further complicates the research. This paper
presents a leading research for the opinion holder extraction in Arabic news
independent from any lexical parsers. We investigate constructing a
comprehensive feature set to compensate the lack of parsing structural
outcomes. The proposed feature set is tuned from English previous works coupled
with our proposed semantic field and named entities features. Our feature
analysis is based on Conditional Random Fields (CRF) and semi-supervised
pattern recognition techniques. Different research models are evaluated via
cross-validation experiments achieving 54.03 F-measure. We publicly release our
own research outcome corpus and lexicon for opinion mining community to
encourage further research
Boundary Element Modeling and Optimization of Three Temperature Nonlinear Fractional Generalized Photo-Thermoelastic Interaction in Anisotropic Semiconductor Structures
The main objective of this paper is to introduce a new fractional-order theory called nonlinear fractional generalized photo-thermoelasticity involving three temperatures. Due to strong nonlinearity, it is very difficult to solve the wave problems related to this theory analytically. Therefore, we propose a new boundary element algorithm and technique for simulation and optimization of the considered problems related to this theory. The genetic algorithm (GA) as an optimization method has been applied based on free form deformation (FFD) technique to improve the performance of our proposed technique. In the formulation of the considered problem, the profiles of the considered objects are determined by FFD technique, where the FFD control point positions are treated as genes, and then the chromosome profiles are defined with the gene sequence. The population is established by a number of individuals (chromosomes), where the objective functions of individuals are achieved by the boundary element method (BEM). A nonuniform rational B-spline curve (NURBS) was used to model optimized boundary where it reduces the number of control points and provides the flexibility to design several different shapes for solving the considered photo-thermoelastic wave problems. The numerical results verify the validity and accuracy of our proposed boundary element technique
Boundary element solution of 2D coupled problem in anisotropic piezoelectric FGM plates
The mechanics of the piezoelectric functionally graded material (FGM) has received considerable research effort with their increasing usage in various applications including sensors and actuators, piezoelectric motors, reduction of vibrations and noise, infertility treatment and photovoltaics. It is hard to find the analytical solution of a problem in a general case, therefore, an important number of engineering and mathematical papers devoted to the numerical solution have studied the overall behavior of such materials. The time-stepping dual reciprocity boundary element method was proposed to solve the 2D coupled problem in anisotropic piezoelectric FGM plates. The accuracy of the proposed method was examined and confirmed by comparing the obtained results with those known previously
Boundary Element Mathematical Modelling and Boundary Element Numerical Techniques for Optimization of Micropolar Thermoviscoelastic Problems in Solid Deformable Bodies
The main objective of this chapter is to introduce a new theory called three-temperature nonlinear generalized micropolar thermoviscoelasticity. Because of strong nonlinearity of simulation and optimization problems associated with this theory, the numerical solutions for problems related with the proposed theory are always very difficult and require the development of new numerical techniques. So, we propose a new boundary element technique for simulation and optimization of such problems based on genetic algorithm (GA), free form deformation (FFD) method and nonuniform rational B-spline curve (NURBS) as the shape optimization technique. In the formulation of the considered problem, the profiles of the considered objects are determined by FFD method, where the FFD control points positions are treated as genes, and then the chromosomes profiles are defined with the genes sequence. The population is founded by a number of individuals (chromosomes), where the objective functions of individuals are determined by the boundary element method (BEM). The numerical results verify the validity and accuracy of our proposed technique
Mineralogical and geochemical characteristics of uranium-rich fluoriteinEl-Missikatmineralizedgranite,Central Eastern Desert, Egypt
Analyses of Highway Project Construction Risks, Performance, and Contingency
Past studies have highlighted the importance of risk assessment and management in
construction projects and transportation industry, and have identified cost and time as the
most important risks that transportation professionals want to understand and manage. The
main focus of this study is to comprehensively analyze transportation construction risk
drivers and identify the correlation of the significant risk drivers with project
characteristics, cost growth, schedule growth, and project contingency. This study has
adopted 31 relevant and significant programmatic and project-specific risk drivers from
different past studies. These risk drivers have been analyzed and evaluated using survey
responses from professionals in the context of highway transportation projects. Risk
assessments including rating of the encountered risk drivers and their correlation with
project characteristics have been carried out within the context of highway construction
projects in the United States. Correlations of the construction project performance or risk
measures, cost growth percentage, and schedule growth percentage, with the rating values
of identified risk drivers values have enabled a better understanding of the impacts of risks
and the risk assessment process for highway transportation projects. The impact of
significant risk drivers on reported construction cost contingency amounts has also been
analyzed. The purpose of this effort was to assess impact of ratings for cost impact,
schedule impact, and relative importance of the identified risk drivers on contingency amounts. Predetermined method is the common way to calculate contingency amount in
transportation projects. In this study parametric modeling has been used to analyze the
relationship between predetermined contingency amounts in transportation projects with
perceived risk rating values in order to understand how the expert judgments regarding risk
ratings can be used in determination of contingency amounts
Boundary Element Model for Nonlinear Fractional-Order Heat Transfer in Magneto-Thermoelastic FGA Structures Involving Three Temperatures
The principal objective of this chapter is to introduce a new fractional-order theory for functionally graded anisotropic (FGA) structures. This theory called nonlinear uncoupled magneto-thermoelasticity theory involving three temperatures. Because of strong nonlinearity, it is very difficult to solve the problems related to this theory analytically. Therefore, it is necessary to develop new numerical methods for solving such problems. So, we propose a new boundary element model for the solution of general and complex problems associated with this theory. The numerical results are presented graphically in order to display the effect of the graded parameter on the temperatures and displacements. The numerical results also confirm the validity and accuracy of our proposed model
Assesing interactivity in the websites of human rights organizations\u27 websites in Egypt
The Internet has many advantages over the other media in the provision of information services especially in the field of human rights. In Egypt the image of the human rights organization has been affected severely after the Egyptian revolution due to continuous media attack on them; therefore, it became vital to change this image. As the websites is the primary tool that permits the organizations to connect with their audience and permit the audience to know their activities, analyzing the websites of the human rights in Egypt from user perspective become vital This study aims to assess the interactivity and public involvement allowed by the sites to see whether they use their websites in an efficient way that permit them to reach their audience nationally and internationally or not, moreover, it tries to figure out reasons behind this level of interactivity. “Reception based analysis†technique was used for the first time in Egypt, to map both the interactivity level and the amount of public engagement allowed by the site in a sample of 10 existing human rights websites along with Heeter and Burgeon 7 dimensions of interactivity (content and availability of choice, effort user must exert, responsiveness to users, ease of adding information, facilitation of interpersonal communication, modality and information rich, and ability to make two ways communication ) ; Moreover , interviews with experts and official working in the field of human rights was used to know more in depth data about the barriers that confront the websites developers of human rights organizations in Egypt Using the reception based analysis technique gives the study the advantage of understanding how the users sees different dimensions of interactivity and public engagement in the websites of human right NGOs. The results of the analysis indicated the overall level of opportunities for interactivity in the websites of human rights NGOs in Egypt is very low; moreover, the overall level of public engagement allowed by the site is low. Moreover, the results of the interviews revealed that lack of funds, lack of media and IT specialists in the organization, and technological gap were the main problems that confront the organization while maintaining interactivity of their website
A New Computerized Boundary Element Model for Three-Temperature Nonlinear Generalized Thermoelastic Stresses in Anisotropic Circular Cylindrical Plate Structures
In this chapter, we propose a new theory called nonlinear generalized thermoelasticity involving three temperatures. Because of strong nonlinearity of the proposed theory, therefore, it is much more difficult to develop analytical solution for solving problems related with the proposed theory. So, we propose a new computerized boundary element model for the solution of such problems and obtaining the three-temperature nonlinear generalized thermoelastic stresses in anisotropic circular cylindrical plate structures problems which are related with the proposed theory, where we used two-dimensional three temperature nonlinear radiative heat conduction equations coupled with electron, ion and phonon temperatures. The numerical results of the current study show the temperatures effects on the thermal stresses. Also, these numerical results demonstrate the validity and accuracy of our proposed model
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