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Jeddah, Saudi Arabia

Huang Y.-S.,National Ilan University | Weng Y.-S.,Army Academy | Zhou M.,New Jersey Institute of Technology | Zhou M.,King AbdulazizUniversity
IEEE Transactions on Intelligent Transportation Systems

Timed Petri nets (TPNs) are useful for performance evaluation of discrete event systems due to their mathematical formalism. This paper focuses on their use to model the preemption of emergency vehicle systems. The advantage of the proposed approach is the clear presentation of traffic light behaviors in terms of conditions and events that cause the preemption of phases being changed. The resulting models allow one to identify and thus avoid urgent spectacles in such systems by conditions and events of the model that control the phase of traffic light alternations. Moreover, this work proposes a new emergency vehicle preemption policy to ensure that emergency vehicles can pass through intersections with no or less delay. The analysis is performed to demonstrate how the models enforce the phase of traffic transitions by a reachability graph with time information. The liveness and reversibility of the proposed model are verified. To our knowledge, this is the first work that employs TPNs to model an emergency vehicle preemption system and identify its urgent spectacles for the purpose of their complete avoidance. This helps advance the state-of-the-art in traffic safety related to the intersection of roadways. © 2000-2011 IEEE. Source

Ahmed M.M.M.,King AbdulazizUniversity | Ahmed M.M.M.,Genetic Engineering and Biotechnology Research Institute GEBRI | Hafez E.E.,Genetic Engineering and Biotechnology Research Institute GEBRI | Mona A.M.,Genetic Engineering and Biotechnology Research Institute GEBRI | And 2 more authors.
World Applied Sciences Journal

Food poisoning is a common, yet distressing and sometimes life-threatening problem for millions of people all over the world. More than 250 different diseases can cause food poisoning. Gram's staining test on these colonies to detect the bacterial type. This step showed that all bacterial samples were gram positive bacteria and confirmed that high degree of similarity between the aerobic and faculatitative aerobic samples in the shape. Six different antibiotics were used to study the resistance of the isolated bacteria against these antibiotics. Different concentrations were used in the culture media starting with 0.005 mg/ml. The MIC was according to the antibiotic activity against the examinated bacteria. The lowest minimum inhibition concentration (MIC) of tetracycline (0.005 mg/ml).then, ampicillin and kanamycin (0.025 mg/ml), then neomycin and spectinomycin (0.08 mg/ml) the highest MIC was in case of chloromphenicol (0.125 mg/ml). This result was confirmed that different degree of antibiotic resistance affecting on the bacterial growth, bacteria have the highest resistance to chloromphenicol and moderate resistance to ampicillin, kanamycin, neomycin and spectinomycin while have the lowest resistance to tetracycline. © IDOSI Publications, 2014. Source

Thabet A.,Aswan University | Mobarak Y.,King AbdulazizUniversity | Mobarak Y.,Aswan University
International Journal of Electrical and Computer Engineering

Polymer nanocomposites possess promising high performances as engineering materials, if they are prepared and fabricated properly. In this research, it has been processed samples of nanocomposite polymers as electrical insulating materials for application on the electric power cables by using the latest techniques of nanotechnology. This paper has been investigated enhanced dielectric and electrical properties of Polyvinyl chloride PVC as matrix have shown that trapping properties are highly modified by the presence of costless nanofillers clay and fumed silica. An experimental work for dielectric loss and capacitance of the new nanocomposite materials have been investigated and compared with unfilled industrial materials. It is found that a good correlation exists in respect of capacitance and dielectric loss values measured with percentage of nanofillers. Thus, it has been investigated the influence of costless nanofillers material and its concentration on dielectric properties of industrial polymers-based composite systems. A comparative study is performed between the unfilled base polymers, the systems containing one type of nanoparticles clayor fumed silica inside the host polymer with various concentrations. Copyright © 2015 Institute of Advanced Engineering and Science. All rights reserved. Source

Djamah T.,Mouloud Mammeri University | Bettayeb M.,University of Sharjah | Bettayeb M.,King AbdulazizUniversity | Djennoune S.,Mouloud Mammeri University
Asian Journal of Control

This paper deals with identification of multivariable fractional order systems. The state space model is used, based on the Guidorzi canonical form. An output error identification approach is used, and the parametric sensitivity functions model is developed as a multivariable fractional model. Its simulation is carried out using the fractional bounded integration operator. Different simulations test the method efficiency, and its statistical performance is analyzed, using Monte Carlo simulation at various signal-to-noise ratios. © 2013 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society. Source

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