Mohamed Kamel | Ahram Canadian University (original) (raw)

Papers by Mohamed Kamel

Expert review of anticancer therapy, 2017

Non-Hodgkin's lymphoma (NHL) survivors are at a higher risk of cardiovascular diseases (CVDs)... more Non-Hodgkin's lymphoma (NHL) survivors are at a higher risk of cardiovascular diseases (CVDs). A population-based study was conducted to investigate the cardiovascular mortality trends to identify NHL survivors at the highest risk. The CVDs mortality was the second most common cause of death (13.07%) after NHL. There were more patients ≥ 60 years old in the cardiovascular group (87.2%), P < 0.001. Patients who died from CVDs had the best survival while patients who died from NHL had a significantly lower mean survival. The overall survival rate was 92.4%. Consistently, older age, unmarried, male patients, not recently diagnosed with NHL and not receiving radiation and/or surgery were associated with a worse survival across all models. The black race and stage IV only had a worse cardiovascular specific survival (CVSS). Although the CVSS improved over time, the mortality from the CVDs is still the second most common cause of death after NHL. Older age, not married, black, male...

Eastern Mediterranean health journal = La revue de santé de la Méditerranée orientale = al-Majallah al-ṣiḥḥīyah li-sharq al-mutawassiṭ

The effect of schistosomiasis on quality of life (QOL) and productivity of workers was examined. ... more The effect of schistosomiasis on quality of life (QOL) and productivity of workers was examined. In a textile factory in Alexandria, Egypt, personal, occupational and sociodemographic data were collected from 172 workers with schistosomiasis and 172 workers without schistosomiasis. Several indicators of productivity and the World Health Organization QOL brief were used to determine the impact of schistosomiasis. The disease affected the general, physical and independence, psychological and spiritual, and social domains of QOL. Although the productivity score of workers with schistosomiasis did not differ significantly from the control group, they had significantly lower additional hours of work and lower total incentives/month. A significant relationship was found between severity of schistosomiasis and QOL domains and productivity indicators.

Bull. Alex. Fac. …, 2010

... Thuraya AA Ghayath,1 Amani H Al-Sagobi,2 Ameena MA Alansari,3 Medhat K El-Shazly,4 Mohamed I ... more ... Thuraya AA Ghayath,1 Amani H Al-Sagobi,2 Ameena MA Alansari,3 Medhat K El-Shazly,4 Mohamed I Kamel5 1 RCGP-Kuwait, Head of ... 29.0% for obligation of women to share with their money in the house expenses, 30.8% for men should be the decision makers in home ...

ACM Transactions on Mathematical Software, 1979

... 5, No. 4, D~eember 1979 , ~. ~ . _ ~&lt;~ . ~ L ~ ~ ~-. Page 7. 380 WH Ennght and MS ... more ... 5, No. 4, D~eember 1979 , ~. ~ . _ ~&lt;~ . ~ L ~ ~ ~-. Page 7. 380 WH Ennght and MS Kamel and the algorithm is 1. Form the vector c = [~] by setting c = S -1 (1/hflo)G(y~+]). 2. Solve (-1/hflo)I,-kz2 = c2. 3. Solve Ly = cl - R12z2. 4. Solve Uzl = y. 5. Set t _ z~ ,~,+ S[zJ. ...

Several supervised and unsupervised methods have been applied to the field of character recogniti... more Several supervised and unsupervised methods have been applied to the field of character recognition. In this research we focus on the unsupervised methods used to group similar characters together. Instead of using the traditional clustering algorithms, which are mainly ...

Cells

COVID-19 infection has protean systemic manifestations. Experience from previous coronavirus outb... more COVID-19 infection has protean systemic manifestations. Experience from previous coronavirus outbreaks, including the current SARS-CoV-2, has shown an augmented risk of thrombosis of both macrovasculature and microvasculature. The former involves both arterial and venous beds manifesting as stroke, acute coronary syndrome and venous thromboembolic events. The microvascular thrombosis is an underappreciated complication of SARS-CoV-2 infection with profound implications on the development of multisystem organ failure. The telltale signs of perpetual on-going coagulation and fibrinolytic cascades underscore the presence of diffuse endothelial damage in the patients with COVID-19. These parameters serve as strong predictors of mortality. While summarizing the alterations of various components of thrombosis in patients with COVID-19, this review points to the emerging evidence that implicates the prominent role of the extrinsic coagulation cascade in COVID-19-related coagulopathy. These...

Proceedings 11th International Workshop on Database and Expert Systems Applications, 2000

The World Wide Web (WWW) is a vast repository of information. Although there is a great value for... more The World Wide Web (WWW) is a vast repository of information. Although there is a great value for this information, its size, dynamic and distribution nature put a significant amount of time and effort to locate, retrieve and integrate the desired information. In addition, different users usually have different views and interest for the same information. The paper proposes a

Pattern Recognition, 1991

In this paper, the problem of achieving 'semi-fuzzy' or 'soft' clustering of multidimensional dat... more In this paper, the problem of achieving 'semi-fuzzy' or 'soft' clustering of multidimensional data is discussed.A technique based on thresholding the results of the fuzzy c-means algorithm is introduced.The proposed approach is analysed and contrasted with the soft clustering method (see S. Z. Selim and M. A. Ismail, Pattern Recognition 17, 559-568) showing the merits of the new method.Separation of clusters in the semi-fuzzy clustering context is introduced and the use of the proposed technique to measure the degree of separation is explained.

Phytochemistry, 2001

From the leaves of Cryptostegia grandiflora, four new cardiac glycosides oleandrigenin 3-O-beta-g... more From the leaves of Cryptostegia grandiflora, four new cardiac glycosides oleandrigenin 3-O-beta-glucopyranosyl-(1-->4)-beta-cymaropyranosyl-(1-->4)-beta-digitoxopyranoside, cryptostigmin I, oleandrigenin 3-O-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranoside, cryptostigmin II, 16-propionylgitoxigenin 3-O-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranoside, cryptostigmin III and oleandrigenin 3-O-beta-glucopyranosyl-(1-->6)-beta-glucopyranosyl-(1-->4)-beta-cymaropyranosyl-(1-->4)-beta-digitoxopyranoside, cryptostigmin IV have been isolated together with two known cardenolides subalpinosid and 16-O-acetyl-digitalinum verum. The structures of the isolated compounds were verified by means of MS and NMR spectral analyses.

Urology Annals, 2015

Partial nephrectomy is becoming the standard of care in management of small renal tumors and exci... more Partial nephrectomy is becoming the standard of care in management of small renal tumors and excision of the peritumor fat is recommended for accurate staging. During the surgery, the overlying fat may be excised for accurate visualization of margins or maybe inadvertently left behind when performing a partial nephrectomy in an obese patient. We investigated the prevalence of fat involvement in these patients. Aims: The aim was to document the prevalence of peritumor fat involvement discovered after partial nephrectomy performed for radiologic T1 renal cancer. Settings and Design: Between 2005 and 2011, 107 partial nephrectomy procedures were performed for radiologic T1 disease. Statistical Analysis: All analyses were performed using SAS 9.2. Subjects and Methods: Patients were classified as: Group A (n = 88 patients), patients with stage T1a (tumor size ≤4 cm) and Group B (n = 24 patients) patients with stage T1b (tumor size 4-7 cm). Results: The overall prevalence of peritumor fat involvement was 1.86% (n = 2). The two patients had tumor ≤4 cm in size of the papillary subtype and were followed for 61 and 57 months, respectively. Both were living and without recurrence. Patient demographics and tumor characteristics did not differ between the two groups except, Fuhrman Grades 3 and 4 were statistically more prevalent in Group B (<0.01). Tumor grade, clear cell type cancer and stage T1b did not correlate with peritumor fat involvement in the study population. Conclusions: Our study revealed a low prevalence of peritumor fat involvement in radiologic pT1 renal cancer; however, peritumor fat removal is still recommended.

Journal of the American Chemical Society, 1955

w-Nitrostyrenes add aromatic thiols to give the P-nitrosulfides, which are oxidized readily to th... more w-Nitrostyrenes add aromatic thiols to give the P-nitrosulfides, which are oxidized readily to the p-nitrosulfones. The treatment of 4-styryl-5-oxazolones (VI and IX) with aromatic thiols resulted in opening of the hetero ring and addition to the double bond to yield VI11 and X, ...

Alexandria Journal of Medicine, 2011

Introduction: Domestic violence (DV) against women has been identified as a serious public health... more Introduction: Domestic violence (DV) against women has been identified as a serious public health problem. Primary care nurses usually play an important role in managing battered women. They must be equipped with the necessary knowledge, training and experience. Objective: The aim of this work was to study the knowledge and perception of primary care nurses about DV. Methods: This study was carried out in all primary health care centers in Kuwait. All nurses who were currently working in these centers during the study period were asked to complete a selfadministered close-ended questionnaire that included personal and working conditions information. It included also knowledge about prevalence of DV, and four main aspects relevant to DV, namely deprivation, psychological, physical and sexual domains. A 5-point, Likert-scale was used

Binarization of document images with poor contrast, strong noise, complex patterns, and variable ... more Binarization of document images with poor contrast, strong noise, complex patterns, and variable modalities in the gray-scale histograms is a challenging problem. A new binarization algorithm has been developed to address this problem for personal cheque images. The main contribution of this approach is optimizing the binarization of a part of the document image that suffers from noise interference, referred to as the Target Sub-Image (TSI), using information easily extracted from another noise-free part of the same image, referred to as the Model Sub-Image (MSI). Simple spatial features extracted from MSI are used as a model for handwriting strokes. This model captures the underlying characteristics of the writing strokes, and is invariant to the handwriting style or content. This model is then utilized to guide the binarization in the TSI. Another contribution is a new technique for the structural analysis of document images, which we call "Wavelet Partial Reconstruction" (WPR). The algorithm was tested on 4,200 cheque images and the results show significant improvement in binarization quality in comparison with other well-established algorithms.

Recently, there are keen interests in EigenPalm, which, collectively, refers to those methods tha... more Recently, there are keen interests in EigenPalm, which, collectively, refers to those methods that extract palmprint features directly from the appearance by means of Principal Component Analysis (PCA) for (dis)similarity matching. Encouraging results have been reported with the use of EigenPalm. However, we find a different story under a system and evaluation perspective. In this paper, we would like to introduce three issues that should be considered: the effects of templates from two different sessions, the effects of identical twins and the effects of unseen subjects. They are missing in the previous studies of EigenPalm.

IrisCode, a widely deployed iris recognition algorithm, developed in 1993 and continuously modifi... more IrisCode, a widely deployed iris recognition algorithm, developed in 1993 and continuously modified by Daugman has attracted considerable attentions. IrisCode using a coarse phase representation has number of properties such as rapid matching, binomial imposter distribution and predictable false acceptance rate. Although many similar coding methods have been developed for irises and palmprints based on IrisCode, a theoretical analysis of IrisCode has not been provided. In this paper, we aim at studying (1) the nature of IrisCode, (2) the property of the phase of Gabor function, (3) the extension of bitwise hamming distance and (4) the theoretical foundation of the binomial imposter distribution and extending the coarse phase representation to a precise phase representation. Precisely, we demonstrate that IrisCode is a clustering algorithm with four prototypes; the locus of a Gabor function is a two-dimensional ellipse with respect to the phase parameter and bitwise hamming can be regarded as angular distance. Using these properties, we provide a precise phase representation for IrisCode with an effective implementation for filtering and matching. Practically, the imposter distribution of IrisCode follows binomial distribution. However, the theoretical evidence is incomplete according to our analysis.

Clustering techniques organize a collection of objects into cohesive groups called clusters such ... more Clustering techniques organize a collection of objects into cohesive groups called clusters such that objects in the same cluster are more similar to each other than objects in different clusters. There are many clustering approaches proposed in the literature with different quality/complexity tradeoffs. Combining multiple clustering is an approach to overcome the deficiency of single algorithms and further enhance their

An interactive environment for performing the motor unit potential (MUP) classification tasks req... more An interactive environment for performing the motor unit potential (MUP) classification tasks required for electromyographic (EMG) signal decomposition is described and developed utilizing the MATLAB high-level programming language and its interactive environment. Certainty-based classification approach had been employed for the classification task in which the assignment criterion used for MUPs is based on a combination of MUP shapes and motor

Supervised pixel-based texture classification is usually performed in the feature space. We propo... more Supervised pixel-based texture classification is usually performed in the feature space. We propose to perform this task in (dis)similarity space by introducing a new compression-based (dis)similarity measure. The proposed measure utilizes two dimensional MPEG-1 encoder, which takes into consideration the spatial locality and connectivity of pixels in the images. The proposed formulation has been carefully designed based on MPEG encoder functionality. To this end, by design, it solely uses P-frame coding to find the (dis)similarity among patches/images. We show that the proposed measure works properly on both small and large patch sizes. Experimental results show that the proposed approach significantly improves the performance of supervised pixel-based texture classification on Brodatz and outdoor images compared to other compression-based dissimilarity measures as well as approaches performed in feature space. It also improves the computation speed by about 40% compared to its rivals.

Phytochemistry, 2014

Three aromatic glycosides (1-3), two sulfur and nitrogen-containing compound glucosides (4, 5), a... more Three aromatic glycosides (1-3), two sulfur and nitrogen-containing compound glucosides (4, 5), and one flavonoid glycoside (6) were isolated from the leaves of Ixora undulata. Their structures were established by extensive 1D, 2D NMR, and HRESIMS experiments, and structure 4 was further confirmed by single crystal X-ray diffraction analysis. Of the assayed compounds, 7, 11 and 12 showed strong inhibitory activity toward advanced glycation end-products formation with IC 50 values of 86.0 lM, 76.6 lM and 98.6 lM, respectively.

Phytochemistry, 2000

From the leaves of Phlomis aurea, two new iridoids of unique structures named 3-epiphlomurin (1) ... more From the leaves of Phlomis aurea, two new iridoids of unique structures named 3-epiphlomurin (1) and phlomurin (2), a new megastigmane glucoside phlomuroside (3) and a new benzyl alcohol glycoside having the structure benzyl alcohol-O-b-xylopyranosyl-(132)-b-glucopyranoside (4) have been isolated together with four known iridoids auroside, lamiide, 8-epiloganin and ipolamiide, two known phenolic glycosides acteoside (verbascoside) and syringin, one known phenylethanoid glycoside 2-phenylethyl-O-b-xylopyranosyl-(132)-b-glucopyranoside, one known lignan liriodendrin and three known¯avonoids chrysoeriol-7-O-bglucopyranoside, acacetin-7-O-b-glucopyranoside and luteolin-7-O-b-glucopyranoside. The structures of the isolated compounds were veri®ed by means of mass spectrometry (MS) and nuclear magnetic resonance (NMR) spectral analyses.