Notre Dame University – Louaize is a Catholic, independent university in Zouk Mosbeh, Lebanon. Founded in cooperation with Beirut University College in 1978,as the Louaize College for Higher Education . The name was changed to Notre Dame University – Louaize on August 14, 1987 when the President of The Lebanese Republic issued a decree number 4116 granting the right to operate an independent university. NDU is currently ranked 5th in Lebanon according to its presence on the Web by the Webometrics Ranking of World Universities. Wikipedia.
Challita K.,Notre Dame University - Louaize
International Journal of Artificial Intelligence | Year: 2017
In this paper, we solve the problem of determining a consistent instantiation of any path-consistent and atomic network of RCC8 base relations. We already know that such networks that contain a finite number of variables have a realization in any dimension d ≥ 1. The novelty of our work is that given any path-consistent and atomic constraint RCC8 network, possibly with countably infinite variables, we are able to construct in polynomial time a realization that satisfies it. For this purpose, we suitably instantiate the variables of such a network by associating to them some regular closed sets of the set of real numbers. © 2017 [International Journal of Artificial Intelligence].
Assaad J.J.,Notre Dame University - Louaize |
Daou Y.,Beirut Arab University
Cement and Concrete Research | Year: 2014
The injection of cementitious-based grouts by vacuum pressure techniques is expected to extract part of the mixing water with direct consequences on the fresh and hardened properties. A research program was undertaken to evaluate the effect of vacuuming on the amount of water extracted along with resulting changes in grout properties including flowability, static yield stress, viscosity, unit weight, Wick-induced bleeding, and compressive strength. Tests were conducted using specimens sampled right after mixing as well as after being subjected to vacuum. Test results have shown that the extraction of water decreases fluidity (i.e., flow time and mini-slump cone) and increases the magnitude of yield stress and viscosity, mostly due to increased internal friction and cohesion within the solid particles. Grouts prepared with low water-to-cementitious materials ratio and containing moderate to high concentrations of viscosity-modifying admixtures yielded adequate water retentivity, with minor variations in rheological and hardened properties. © 2014 Elsevier Ltd.
Rahmani S.,University of Québec |
Mendalek N.,Notre Dame University - Louaize |
Al-Haddad K.,University of Québec
IEEE Transactions on Industrial Electronics | Year: 2010
This paper presents a nonlinear control technique for a three-phase shunt active power filter (SAPF). The method provides compensation for reactive, unbalanced, and harmonic load current components. A proportionalintegral (PI) control law is derived through linearization of the inherently nonlinear SAPF system model, so that the tasks of current control dynamics and dc capacitor voltage dynamics become decoupled. This decoupling allows us to control the SAPF output currents and the dc bus voltage independently of each other, thereby providing either one of these decoupled subsystems a dynamic response that significantly slower than that of the other. To overcome the drawbacks of the conventional method, a computational control delay compensation method, which delaylessly and accurately generates the SAPF reference currents, is proposed. The first step is to extract the SAPF reference currents from the sensed nonlinear load currents by applying the synchronous reference frame method, where a three-phase diode bridge rectifier with RL load is taken as the nonlinear load, and then, the reference currents are modified, so that the delay will be compensated. The converter, which is controlled by the described control strategy, guarantees balanced overall supply currents, unity displacement power factor, and reduced harmonic load currents in the common coupling point. Various simulation and experimental results demonstrate the high performance of the nonlinear controller. © 2010 IEEE.
Keyrouz F.,Notre Dame University - Louaize
ROSE 2011 - IEEE International Symposium on Robotic and Sensors Environments, Proceedings | Year: 2011
One of the key features of the human auditory system, is its nearly constant omni-directional sensitivity, e.g., the system reacts to alerting signals coming from a direction away from the sight of focused visual attention. In many surveillance situations where visual attention completely fails since the robot cameras have no direct line of sight with the sound sources, the ability to estimate the direction of the sources of danger relying on sound becomes extremely important. We present in this paper a novel method for sound localization of a static sound source in azimuth and elevation using a humanoid head equipped with two small microphones inserted into its artificial ear canals. We also tackle the moving sound source tracking problem. This new localization system demonstrated high precision in 3D and enabled a low-complexity implementation on the humanoid DSP platform. © 2011 IEEE.
Echocardiographic assessment of the right ventricle, from the conventional approach to speckle tracking and three-dimensional imaging, and insights into the “Right Way” to explore the forgotten chamber
Kossaify A.,Notre Dame University - Louaize
Clinical Medicine Insights: Cardiology | Year: 2015
Background: The right ventricle (RV) has an essential function in cardiovascular physiology and pathology. Currently, it is gaining an increasing interest given its recognized role in many cardiovascular conditions. However, echocardiographic assessment of the RV in daily practice is frequently based on qualitative estimation, and it has been regarded as a neglected chamber.Objective: We sought to review and discuss the appropriate approach and latest methods of assessment of the RV by echocardiography.Methods: A MEDLINE/Pubmed search was performed, and 55 relevant articles were selected; articles addressing right ventricular assessment by echocardiography, along with the latest recommendations, have been reviewed and discussed.Results: A RV diameter .42 mm at the base and .35 mm at the mid-cavitary level indicates right ventricular dilatation; a longitudinal myocardial velocity (S’) ,9.5 mm/s, a tricuspid annular plane systolic excursion ,17 mm, and a fractional area change ,35% are indices of right ventricular systolic dysfunction. A right ventricular ejection fraction of .45% and an absolute value of global longitudinal strain of .21% reflect normal systolic function. The significance of dp/dt, the right myocardial performance index and isovolumic myocardial acceleration, is also discussed along with the parameters of right ventricular diastolic function. The use of novel echocardiographic approaches, such as three-dimensional echo and speckle tracking imaging, allows practitioners to overcome the challenges encountered with conventional echocardiography.Conclusion: Accurate assessment of the RV by echocardiography yields early detection of cardiac diseases, enhances risk stratification, and allows timely initiation of appropriate therapy. © the authors, publisher and licensee Libertas Academica Limited.
Azar T.,Notre Dame University - Louaize
IEEE Antennas and Propagation Magazine | Year: 2013
Overlapped subarrays are a special class of arrays that enable engineers to produce radiation patterns with low sidelobe and grating-lobe levels over a wide bandwidth. Their complex feeding structure has prevented their use until recently. This paper presents a tutorial on overlapped subarrays, and reviews recent work on this technology.
Hawi N.S.,Notre Dame University - Louaize
Computers in Human Behavior | Year: 2012
Internet addiction has been a subject of research since 1996. In step with this trend, this study aims to illuminate Internet addiction in Lebanon based on research evidence. The timing of this study coincides with the growing rate of penetration of Internet service across the country and with current plans to improve this service. This study investigates Internet usage among adolescents, who are the most vulnerable to Internet addiction in the population. Permission to access schools to conduct this research was obtained from the Ministry of Education and Higher Education. A web-based questionnaire was completed by 833 intermediate and secondary students from public and private schools. The questionnaire included items on demographic information and Internet usage and an Arabic version of Young's Internet Addiction Test (YIAT). The results showed that 4.2% of the sample had significant problems. Furthermore, the more problematic Internet use (PIU) was, the less the Internet was used for information and research, and the more it was used for entertainment. PIU is driven by deficiency needs fuelled by the use of interactive applications. The more deficient the need, the greater the obsession with top-notch interactive applications, and the less frequent the usage of non-interactive applications. © 2012 Elsevier Ltd. All rights reserved.
Carlberg K.,Stanford University |
Bou-Mosleh C.,Notre Dame University - Louaize |
Farhat C.,Stanford University
International Journal for Numerical Methods in Engineering | Year: 2011
A Petrov-Galerkin projection method is proposed for reducing the dimension of a discrete non-linear static or dynamic computational model in view of enabling its processing in real time. The right reduced-order basis is chosen to be invariant and is constructed using the Proper Orthogonal Decomposition method. The left reduced-order basis is selected to minimize the two-norm of the residual arising at each Newton iteration. Thus, this basis is iteration-dependent, enables capturing of non-linearities, and leads to the globally convergent Gauss-Newton method. To avoid the significant computational cost of assembling the reduced-order operators, the residual and action of the Jacobian on the right reduced-order basis are each approximated by the product of an invariant, large-scale matrix, and an iteration-dependent, smaller one. The invariant matrix is computed using a data compression procedure that meets proposed consistency requirements. The iteration-dependent matrix is computed to enable the least-squares reconstruction of some entries of the approximated quantities. The results obtained for the solution of a turbulent flow problem and several non-linear structural dynamics problems highlight the merit of the proposed consistency requirements. They also demonstrate the potential of this method to significantly reduce the computational cost associated with high-dimensional non-linear models while retaining their accuracy. © 2010 John Wiley & Sons, Ltd.
Hawi N.S.,Notre Dame University - Louaize
Cyberpsychology, Behavior, and Social Networking | Year: 2013
Concern about Internet addiction, fuelled by the rapid increase in its usage across the globe, has spread to many parts of the world, including the Arab world. Concurrently, there has been a relentless quest for a valid tool for measuring Internet addiction. Thus far, two popular tools have been translated to Arabic: the Compulsive Internet Use Scale and the Internet addiction test (IAT). While the Arabic version of the former was proven valid by one study, the validity of the latter's Arabic version remains in question. Therefore, this study investigated the psychometric properties of the Arabic version of the IAT. An online Arabic version of the IAT was completed by 817 intermediate- and secondary-school students across Lebanon. The results showed that a one-factor model of the IAT has good psychometric properties and fits the data extremely well. This study presents evidence that the Arabic version of the IAT is valid for measuring Internet addiction among adolescents in Lebanon. © Copyright 2013, Mary Ann Liebert, Inc. 2013.
Hawi N.,Notre Dame University - Louaize
Computers and Education | Year: 2010
The purpose of this research is to identify the causal attributions of business computing students in an introductory computer programming course, in the computer science department at Notre Dame University, Louaize. Forty-five male and female undergraduates who completed the computer programming course that extended for a 13-week semester participated. Narrative interviews were conducted to obtain their perceptions. While some research confirmed that the four most responsible causes for success and failure in achievement contexts are ability, effort, task difficulty, and luck, this research shows that in its context 'ability' and 'luck' were absent, and 'task difficulty' and 'effort' were almost absent. In all, participants made 10 causal attributions that were either cultural or specific to computer programming. The 10 causal attributions are 'learning strategy', 'lack of study', 'lack of practice', 'subject difficulty', 'lack of effort', 'appropriate teaching method', 'exam anxiety', 'cheating', 'lack of time', and 'unfair treatment'. All high achievers cited appropriate 'learning strategy'. © 2009 Elsevier Ltd. All rights reserved.