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Search Results: 1 - 10 of 367 matches for " Emad Masuadi "
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Two-sample Bayesian nonparametric goodness-of-fit test
Luai Al Labadi,Emad Masuadi,Mahmoud Zarepour
Statistics , 2014,
Abstract: In recent years, Bayesian nonparametric statistics has gathered extraordinary attention. Nonetheless, a relatively little amount of work has been expended on Bayesian nonparametric hypothesis testing. In this paper, a novel Bayesian nonparametric approach to the two-sample problem is established. Precisely, given two samples $\mathbf{X}=X_1,\ldots,X_{m_1}$ $\overset {i.i.d.} \sim F$ and $\mathbf{Y}=Y_1,\ldots,Y_{m_2} \overset {i.i.d.} \sim G$, with $F$ and $G$ being unknown continuous cumulative distribution functions, we wish to test the null hypothesis $\mathcal{H}_0:~F=G$. The method is based on the Kolmogorov distance and approximate samples from the Dirichlet process centered at the standard normal distribution and a concentration parameter 1. It is demonstrated that the proposed test is robust with respect to any prior specification of the Dirichlet process. A power comparison with several well-known tests is incorporated. In particular, the proposed test dominates the standard Kolmogorov-Smirnov test in all the cases examined in the paper.
What Physicians Know about Statistics in Saudi Arabia  [PDF]
Hella O. Alothman, Emad Masuadi, Tariq Alothman, Samiah Almehmadi, Mohammed H. Alenazi, Raghad Alothman, Mazen S. Ferwana
Open Journal of Social Sciences (JSS) , 2020, DOI: 10.4236/jss.2020.81021
Abstract: Introduction: Statistics is a science that deals with collecting, managing, summarizing, and presenting data. An adequate understanding will help in making decisions [1]. Physicians were found to have limited knowledge of statistics. Objective: To assess the knowledge, familiarity, and competency of statistical concepts among physicians. Methods: It’s a cross-sectional study that was conducted in Riyadh, Saudi Arabia. A convenient sample of 440 physicians was identified and contacted through a digital survey. A questionnaire was used to obtain statistical familiarity and competency among physicians. Results: This study found that more than half of the participants were interested
The implication of dihydrofolate reductase and dihydropteroate synthetase gene mutations in modification of Plasmodium falciparum characteristics
Ishraga E A-Elbasit, Michael Alifrangis, Insaf F Khalil, Ib C Bygbjerg, Emad M Masuadi, Mustafa I Elbashir, Hayder A Giha
Malaria Journal , 2007, DOI: 10.1186/1475-2875-6-108
Abstract: To investigate the effects of dhfr/dhps mutations on parasite characteristics other than SP resistance.Parasite infections obtained from 153 Sudanese patients with uncomplicated falciparum malaria treated with SP or SP + chloroquine, were successfully genotyped at nine codons in the dhfr/dhps genes by PCR-ELISA.Mutations were detected in dhfr at N51I, S108N and C59R, and in at dhps at A/S436F, A437G, K540E and A581G, the maximum number of mutations per infection were five. Based on number of mutant codons per infection (multiplicity of mutation, MOM), the infections were organized into six grades: wild-types (grade 0; frequency, 0.03) and infections with MOM grades of 1 to 5, with the following cumulative frequency; 0.97, 0.931, 0.866, 0.719, 0.121, respectively. There was no significant association between the MOM and SP response. Importantly, immunity, using age as a surrogate marker, contributed significantly to the clearance of parasites with multiple dhfr/dhps mutations. However, these mutations have a survival advantage as they were associated with increased gametocytogenesis. The above implications of dhfr/dhps mutations were associated with MOM 2 to 5, regardless of the gene/codon locus.Falciparum malaria is still out of control, primarily because of the ability of the parasite to develop resistance against the used drugs. But, also the fast disseminations of the resistant parasites and possibly the accelerated ability of the parasite to develop resistance against new drugs, are important factors [1]. Sulphadoxine/pyrimethamine (SP), has been an alternative to CQ for treatment and control of uncomplicated malaria in endemic countries, it was effective, affordable and complying drug. The fixed combination in SP inhibits the action of two enzymes, dihydrofolate reductase (DHFR) and dihydropteroate synthetase (DHPS) in folate metabolism pathway [2,3]. Mutations in the parasite genes coding for the two enzymes, dhfr and dhps, lead to SP resistance, however, the
Advanced Border Intrusion Detection and Surveillance Using Wireless Sensor Network Technology  [PDF]
Emad Felemban
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.65028

Wireless Sensor Network (WSN) has been emerging in the last decade as a powerful tool for connecting physical and digital world. WSN has been used in many applications such habitat monitoring, building monitoring, smart grid and pipeline monitoring. In addition, few researchers have been experimenting with WSN in many mission-critical applications such as military applications. This paper surveys the literature for experimenting work done in border surveillance and intrusion detection using the technology of WSN. The potential benefits of using WSN in border surveillance are huge; however, up to our knowledge very few attempts of solving many critical issues about this application could be found in the literature.

Performance Analysis of RFID Framed Slotted Aloha Anti-Collision Protocol  [PDF]
Emad Felemban
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.21003

In this paper, we develop a novel mathematical model to estimate the probability distribution function of the number of tags discovered after a certain number of interrogation rounds. In addition, the pdfs of the number of rounds needed to discover all the tags are also calculated. The estimation of such pdfs will be helpful in estimating the number of interrogation rounds and the optimal parameter configuration of the RFID system which in turn will be helpful in estimating the time needed to discover all tags. Our results show that the proposed model accurately predicts the tags detection probability. We then use the proposed model to optimally configure the reader parameters (i.e. the frame size and the number of interrogation rounds).

Modelling and Artificial Intelligence-Based Control of Electrode System for an Electric Arc Furnace  [PDF]
Mahmood Moghadasian, Emad Alenasser
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.32009
Abstract: This paper presents a new application of a genetic-fuzzy control system which controls the input energy to a three phase electric arc furnace. Graphite electrodes are used to convert electrical energy into heat via phase electric arcs. Con-stant arc length is desirable as it implies steady energy transfer from the graphite electrodes to the metallic charge in the furnace bath. With the charge level constantly changing, the electrodes must be able to adjust for the arc length to remain constant. A fuzzy PI controller tuned with genetic algorithms has been developed to be responsible for the ver-tical adjustment of the electrode tip displacement according to specified set-points to ensure that the arc lengths remain as constant as possible. The simulation results show that the system performances are satisfactory using the proposed method.
Microstructural Investigation of PM-355 Nuclear Track Detector Subjected to Low-Dose Gamma Irradiation: A Positron Annihilation Lifetime Study  [PDF]
Emad Hassan Aly
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.410076

Samples of the PM-355 polymeric solid state nuclear track detector were exposed to low gamma absorbed doses from 1 kGy (0.1 Mrad) up to 9 kGy (0.9 Mrad). Positron annihilation lifetime (PAL) in conjunction with transmission electron microscopy (TEM) and Thermo-gravimetric analysis (TGA) were performed on irradiated and pristine samples at room temperature. The observed lifetime spectra were resolved into three components where the ortho-positronium (o-Ps) lifetime component was associated with the pick-off annihilation of positronium trapped by the free volume. PAL studies of irradiated PM-355 samples showed that ortho-positronium (o-Ps) lifetime increases with an increase in dose up to 4 kGy and decreases at higher doses. In contrast, the intensity of the o-Ps component, I3, decreases with the dose up to about 2 kGy, followed by a much smooth decrease up to 7 kGy, and then it levels off. TGA analysis indicated that the PM-355 detector decomposed in one main breakdown stage. These results are discussed on the basis of chemical and physical changes occurring at the microscopic level in the PM-355 due to irradiation. Crosslinking dominates for doses between 1 and 4 kGy, while the degradation mechanism (Chain scission) prevails for doses up to 9 kGy.

Antidermatophytic Activity of Essential Oils against Locally Isolated Microsporum canis—Gaza Strip  [PDF]
Emad Khalil Abou Elkhair
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.69067

There is a need for new antimicrobial drugs due to the continuous development of resistance. Natural antimicrobials are of utmost importance due to safety issue and availability. The antifungal activity of four essential oils (Mentha piperta, Thymus vulgaris, Cymbopogon citratus, and Oreganum majoranum oils) against locally isolated Microsporum canis was determined by disc diffusion method and minimum inhibitory concentration was determined using broth dilution method. Mentha piperta oil showed the highest antifungal activity among tested oils in this study. The total inhibition attached when 0.046% was used with M. piperta, the total inhibition obtained with the 0.133% of C. citratus oil, which is accounted as the second essential oils, also T. vulgaris and O. majoranum oils achieved reductions at 0.133%. The present work has revealed that all oils have been used in low concentrations and produced promising results in comparison to the positive control (Clotrimazole).

Dustfall Associated with Dust Storms in the Al-Ahsa Oasis of Saudi Arabia  [PDF]
Emad A. Almuhanna
Open Journal of Air Pollution (OJAP) , 2015, DOI: 10.4236/ojap.2015.42007
Abstract: Dustfall is a major threat to agricultural and industrial infrastructures, as well as to other aspects of livelihood. Dustfall associated to a severe dust storm that hit the Al-Ahsa Oasis of Saudi Arabia during 12-13 March 2014 is discussed in this paper. The storm caused widespread and heavy dust deposition. A dramatic decrease in the visibility coincided with the storm, and the average dust concentrations recorded during a peak 10-hour period were 6772, 5862.4 and 451.1 μg/m3 for total suspended particles (TSP), particulate matter smaller than or equal to 10 μm (PM10) and those smaller than or equal to 2.5 μm (PM2.5), respectively. The lowest visibility was 200 m, and the wind speed increased to 17.5 m/s from the north. The average daily dust deposited in the study area during the event was 12.84 (SD = 1.2) g/(m2?d). The dust samples comprised insoluble dust (48.5%) and soluble dust (51.5%). Based on the Munsell color system, the final color description of the falling dust was 10 YR/6/3. A microphotograph of the dustfall (settleable particulate matter) captured by a stereo dissection microscope shows that the dust particles had various colors and sizes, and they contained fibers and vegetative debris).
Exact Traveling Wave Solutions of Nano-Ionic Solitons and Nano-Ionic Current of MTs Using the exp(-φ (ξ ))-Expansion Method  [PDF]
Emad H. M. Zahran
Advances in Nanoparticles (ANP) , 2015, DOI: 10.4236/anp.2015.42004
Abstract: In this work, the exp(-φ (ξ )) -expansion method is used for the first time to investigate the exact traveling wave solutions involving parameters of nonlinear evolution equations. When these parameters are taken to be special values, the solitary wave solutions are derived from the exact traveling wave solutions. The validity and reliability of the method are tested by its applications to Nano-ionic solitons wave’s propagation along microtubules in living cells and Nano-ionic currents of MTs which play an important role in biology.
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