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Ossama, O., H. M. O. Mokhtar, and M. E. El-Sharkawi, "Clustering Moving Objects Using Segments Slopes", International Journal of Database Management Systems, vol. 3, issue 1, 2011. AbstractCu_pdf.pdf

Given a set of moving object trajectories, we show how to cluster them using k-means
clustering approach. Our proposed clustering algorithm is competitive with the k-means clustering
because it specifies the value of “k” based on the segment’s slope of the moving object trajectories. The
advantage of this approach is that it overcomes the known drawbacks of the k-means algorithm, namely,
the dependence on the number of clusters (k), and the dependence on the initial choice of the clusters’
centroids, and it uses segment’s slope as a heuristic to determine the different number of clusters for the
k-means algorithm. In addition, we use the standard quality measure (silhouette coefficient) in order to
measure the efficiency of our proposed approach. Finally, we present experimental results on both real
and synthetic data that show the performance and accuracy of our proposed technique.

Ossama, O., H. M. O. Mokhtar, and undefined, "Dynamic k-means: a clustering technique for moving object trajectories", {IJIIDS}, vol. 6, no. 4, pp. 307–327, 2012. Abstract


and Ossama E. Gouda, Adel Z. El Dein, G. A. M., "Effect of Dry Zone Formation around Underground Power Cables on Their Ratings", IEEE TRANSACTIONS ON POWER DELIVERY, vol. 26, NO. 2,, pp. 972 - 978, Submitted.
do Ossama E. Gouda, U. C.;;, U. B. de Ghada M. Amer, and U. V. S. A.(E.)- do do Adel Z. El Dein, "Redução da capacidade de corrente pela formação de zonas secas no solo", CABOS SUBTERRÂNEOS, pp. 130-142, Submitted. 2_em_portuguese_1_2010.pdf
Ossama E. Gouda1, Faculty of Energy Engineering, C. U. G. E., and A. U. A. E. Adel Zein El Dein, Faculty of Energy Engineering, "Improving underground power distribution capacity using artificial backfill materials", IET Generation, Transmission & Distribution, vol. 1, pp. 1-8, 2015. gtd-2015-0274_1.pdf
Ossama S. Alshabrawy, and A. E. Hassanien, "Underdetermined blind separation of mixtures of an unknown number of sources with additive white and pink noises", The 5th International Conference on Innovations in Bio-Inspired Computing and Applications (Springer) IBICA2014, Ostrava, Czech Republic., 22-24 June, 2014. Abstractibica2014_p29.pdf

In this paper we propose an approach for underdetermined
blind separation in the case of additive Gaussian white noise and pink
noise in addition to the most challenging case where the number of source
signals is unknown. In addition to that, the proposed approach is appli-
cable in the case of separating I +3 source signals from I mixtures with
an unknown number of source signals and the mixtures have additive two
kinds of noises. This situation is more challenging and also more suitable
to practical real world problems. Moreover, unlike to some traditional
approaches, the sparsity conditions are not imposed. Firstly, the number
of source signals is approximated and estimated using multiple source
detection, followed by an algorithm for estimating the mixing matrix
based on combining short time Fourier transform and rough-fuzzy clus-
tering. Then, the mixed signals are normalized and the source signals
are recovered using multi-layer modi ed Gradient descent Local Hier-
archical Alternating Least Squares Algorithm exploiting the number of
source signals estimated , and the mixing matrix obtained as an input
and initialized by multiplicative algorithm for matrix factorization based
on alpha divergence. The computer simulation results show that the pro-
posed approach can separate I + 3 source signals from I mixed signals,
and it has superior evaluation performance compared to some traditional
approaches in recent references.

Ossama.M.M.Abdelwahab, R. L. Bingner, F. Milillo, and F. Gentile, "Best Management Practices for sediment control in a Mediterranean agricultural watershed", EGU General Assembly 2015, VIENNA, AUSTRIA, pp. Vol. 17, EGU2015-3308, 2015, 2015. egu2015-3308_sss9.9.pdf
Ossama.M.M.Abdelwahab, Assessing soil moisture content and its distribution under surface and sub-surface drip irrigation systems using neutron moisture technique, , VALENZANO, ITALY., ISTITUTO AGRONOMICO MEDITERRANEO DI BARI, 2010.
Oteibi, F. E., and N. Sherif, "the effect of letrozole versus clomiphene citrate on ovulation induction in polycystic ovarian syndrome patients: RCT", Evidence Based Women's Health Journal, 2013.
Oteifa, B. A., M. M. Shamseldean, and M. H. El-Hamawi, "A preliminary compiled study on the biodiversity of free-living, plant-and insect-parasitic nematodes in Egypt", Egyptian Journal of Agronematology. (Egypt), vol. 1, issue (1), pp. 1-36, 1997. Abstract
Othman, M., H. Hassan, R. Moawad, and A. El-Korany, "Opinion Mining and Sentimental Analysis Approaches: A Survey", Life Science Journal, vol. 11, issue 4, pp. 321-326, 2014.
Othman, A. M., M. E. El-Houseini, M. S. El-Sofy, and H. Y. Aboul-Enein, "Potentiometric determination of α-L-fucosidase enzyme by using 2-chloro-4-nitrophenol-rhodamine B ion pair chemical recognition in PVC membrane sensor.", Analytical and bioanalytical chemistry, vol. 400, issue 3, pp. 787-95, 2011 May. Abstract

The activity of the α-L-fucosidase (AFU) enzyme represents an excellent test for diagnosis of hepatocellular carcinoma (HCC) and fucosidosis recognized in inborn disorder of metabolism and increases the sensitivity of detection to 95.5% in patients with HCC. Therefore, the determination of the activity of AFU enzyme is very important and can be used as a screening tool for the early diagnosis of tumors for HCC patients. A simple, accurate, and sensitive potentiometric method was developed for measuring the activity of AFU. The method was based upon measuring the concentration of 2-chloro-4-nitrophenol (2-chloro-4-NP) using a 2-chloro-4-NP-rhodamine B ion pair in a PVC membrane sensor. The electrode shows a linear, reproducible, and stable potentiometric response with an anionic Nernstian slope of -51.13 ± 0.6 mV/decade over a wide range of concentrations 10(-5)-10(-2) M and a detection limit of 1.0 × 10(-6) M of 2-chloro-4-NP. The membrane exhibits a fast response time of 30 s, over a pH range of 4.0-6.5. The selectivity coefficients indicate excellent selectivity for 2-chloro-4-NP over a number of interfering species, e.g., chloride, nitrate, sulfate, chromate urea, albumin, glucose, uric acid, and total protein. The prepared sensor has been used successfully for the determination of 2-chloro-4-NP produced from the hydrolysis of 2-chloro-4-NP-α-L-fucopyranoside substrate. It was also applied for the determination α-L-fucosidase enzyme of 33 serum samples of healthy subjects and patients. The average recoveries ± RSD for the healthy subjects, cirrhosis of chronic hepatitis C and B, and HCC serum samples were 102.6 ± 1.01%, 101.5 ± 0.95%, and 100.1 ± 1.1%, respectively. The results obtained are in good agreement with those obtained by standard methods.

Othman, K. M. M., and H. Abdelwahab, "Prediction of the optimum asphalt content using artificial neural networks", Metallurgical and Materials Engineering, vol. 27, issue 2, pp. 227-242, 2021. Abstract
Othman, M. A., I. A. Eshrah, and T. M. Abuelfadl, "Analysis of waveguide discontinuities using eigenmode expansion", Microwave Symposium Digest (IMS), 2013 IEEE MTT-S International: IEEE, pp. 1–3, 2013. Abstract
Othman, O. E., M. G. Khodary, A. H. El-Deeb, and H. A. Hussein, "Five BoLA-DRB3 genotypes detected in Egyptian buffalo infected with Foot and Mouth disease virus serotype O", Journal of Genetic Engineering and Biotechnology, vol. 16, issue 2, pp. 513-518, 2018.
Othman, A. A., and M. S. Abdelazim, "Ventilator-associated pneumonia in adult intensive care unit prevalence and complications", The Egyptian Journal of Critical Care Medicine, vol. 6, 2017. vap_paper.pdf
Othman, A. B. M., M. H. Ismail, and M. S. El-Soudani, "Pilot-aided channel estimation in cooperative SFBC-OFDM networks", 2011 International Conference on Graphic and Image Processing: International Society for Optics and Photonics, pp. 82854V–82854V, 2011. Abstract
Othman, H. T., E. A. Abd ElWahab, F. A. Abed, M. A. Hassan, and M. G. Moustafa, "Integrating six sigma model with team STEPPS: A plan for sustaining interdisciplinary teamwork", Bioscience research, vol. 15(4), issue 10-18, pp. 3510-3518, Submitted.
Othman, M., H. Hassan, R. Moawad, and A. El-Korany, "Opinion Mining and Sentimental Analysis Approaches: A Survey", Life Science Journal, vol. 11, no. 4, pp. 321–326, 2014. Abstract
Othman, D. A., A. A. A. Melegy, and A. Abdelhalim, Stratigraphy, Geochemical and Mineralogical Characterization of Lower Miocene Smectitic Clay Deposits, Case: South El-Hammam, Egypt., , vol. 65, issue 13, pp. 59 - 72, 2022. AbstractWebsite

This work discusses the physical, geochemical and mineralogical characterization of some bentonite resources in South El-Hammam area which are hosted in thick sandstone sequences belonging to the Lower Miocene Moghra Formation. Bentonite samples were characterized by microscopic, SEM, XRD and ICP-MS analyses. Bentonite resources in this study consist of montmorillonite as the main clay mineral of all the analyzed samples. Kaolinite also occurs as minor clay constituents. The identified non-clay minerals include; quartz, albite and calcite. The highest grade of the studied bentonite, contains Si/Al molecular ratio of 2, suggesting absence of detrital quartz. In contrary, the lowest grade of bentonite with alumina content of 15.06%, display Si/Al molecular ratio of 4.34, where free silica dominates over bentonite. The REE content of the Lower Miocene bentonite study area is strongly imparted by LREE signature. The very high CIA index (74.85 and 91.25) suggesting intense chemical weathering of source rock, which is supported by the presence of Ce abnormality, indicating that they were deposited under pluvial conditions.

Othman, M. I. A., and N. H. Sweilam, "Electrohydrodynamic instability in a horizontal viscoelastic fluid layer in the presence of internal heat generation", Canadian Journal of Physics, vol. 80, no. 6, pp. 697-705, 2002. AbstractWebsite