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Salman, Saudi Arabia

Ziyad S.,Salman bin Abdul Aziz University | Kannammal A.,Coimbatore Institute of Technology
Advances in Intelligent Systems and Computing | Year: 2014

The omnipresence of high-speed Internet has paved a promising future for cloud computing. Cloud computing technology deals with providing software, platform, and infrastructure as a service to the clients. This ultimately leads to transmission of the client’s confidential data in the cloud. This factor is the motivation to provide a secure biometric authentication framework to the cloud. This paper proposes a multifactor biometric authentication system for cloud computing environment. The biometric features adopted here are palm vein and fingerprint. The idea is to handle the biometric data in a secure fashion by storing the palm vein biometric data in multicomponent smart cards and fingerprint data in the central database of the cloud security server. In order to enhance security, the part of biometric data matching process is performed on the card with Match-on-Card technology and data never leave the smart card. © Springer India 2014.

Ahmad S.,Salman bin Abdul Aziz University
Bangladesh Medical Research Council Bulletin | Year: 2012

Antibiotic resistance of urinary tract pathogens has increased worldwide. The purpose of this study is to provide information regarding the causative agents of urinary tract infection in Kashmiri patients, identify the uropathogens responsible for the infection and study the antibiotic susceptibility patterns of the uropathogens. Clean voided mid-stream urine samples were collected from 2190 patients. The specimens were cultured and the isolates were identified using standard microbiological techniques. The antibiotic susceptibilities of the isolates were also determined. Of 2190 specimens, 591 (27%) showed significant growth upon culture. Approximately 84.1 % (497/591) of the 591 patients with UTI were females, most of which belonged to the 21-30 age group (206). The males accounted for 15.9% (94/591) UTI cases. Most of the male patients belonged to the 21-30 age group (34). The lowest incidence of urinary tract infections was seen among the 13-20 years age group. Throughout this study males accounted for only 16% of all UTI cases. Esherichia coli was the most predominant isolate, 53.8% followed by Klebsiella pneumoniae 22.4% and Pseudomonas aeruginosa 7.6%. All isolates were fully sensitive to ofloxacin, and more than 94% were sensitive to cefuroxime. Apart from group D Streptococcus , the overall response to ampicillin by all isolates was less than 15%. The prevalence of multi-resistant Pseudomonas aeruginosa in community-acquired urinary tract infections is increasing. All Pseudomonas aeruginosa isolates were fully susceptible to cefuroxime and ofloxacin. It is recommended that cefuroxime and ofloxacin or both are used in the blind treatment of urinary tract infection while awaiting the culture and sensitivity results. Concurrent with the necessary shift in the prescription pattern, attention should be paid to restriction of antibiotic abuse in the community to retard development of further drug resistance.

Ben Bacha H.,University of Sfax | Ben Bacha H.,Salman bin Abdul Aziz University
Desalination | Year: 2013

The present study investigates the dynamic functioning of a new solar desalination process based on the humidification/dehumidification (HD) principle. The design and the principle of working of the desalination system are described. The paper deals with the modeling, simulation aspects, and experimental validation of the main components of the system. Mathematical models were established including the mechanism of heat and mass transfer in the various components. These models use real meteorological data to predict the performance of a thermal solar driven system. Series of experiments were conducted and experimental results were then compared with the simulation results. Our findings showed that the developed models could be used to design and help in predicting the behavior of the installation in various meteorological conditions. © 2013 Elsevier B.V.

Rad A.,University of Technology Malaysia | Mohd Rahim M.S.,University of Technology Malaysia | Rehman A.,Salman bin Abdul Aziz University | Altameem A.,King Saud University | Saba T.,Prince Sultan University
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2013

With a wide variety researches on Image segmentation techniques in biomedical and bioinformatics area, it is important to analyze the performance of these approaches in specific problems. Image segmentation is one of the most significant processes of dental X-ray image analysis. Therefore, to obtain the proper result, it is required to perform the accurate and efficient segmentation approach which proved itself in the aspect of X-ray image segmentation. The aim of this review paper is to understand the different image segmentation approaches which have been used for dental X-ray image analysis over the past studies. In this paper, different available approaches of dental X-ray image segmentation, reviewed and their advantages, disadvantages, and limitations are discussed.

Hussain Z.,King Saud University | Khan M.I.,Innsbruck Medical University | Shahid M.,Salman bin Abdul Aziz University | Almajhdi F.N.,King Saud University
Genetics and Molecular Research | Year: 2013

DNA methylation is a fundamental epigenetic mechanism in regulating the expression of genes controlling crucial cell functions in cancer development. Gene silencing via CpG island methylation/demethylation in the promoter region is one of the mechanisms by which different genes are inactivated/activated in human cancers. Tissue inhibitor of metalloproteinase-2 (TIMP-2) is known to antagonize matrix metalloproteinase (MMP) activity and to suppress tumor growth, angiogenesis, invasion, and metastasis. TIMP-2 expression has been found to be both upregulated and downregulated in various cancers. The inconsistent TIMP-2 expression and unclear epigenetic regulation lead us to investigate its role in colorectal cancer in the presence of a methylating agent. Highly invasive human colorectal cells SW-620 were treated with the methyl donor S-adenosylmethionine (SAM) and its effect was evaluated by cell proliferation, cell cycle, invasion and migration assay. The ability of SAM to down regulate a panel of activated prometastatic, angiogenesis and growth- and cell cycle-regulatory genes was evaluated using end-point and real-time PCR. Treatment of SW-620 with SAM diminished cell proliferation and altered cell cycle kinetic G2/M phase cell cycle arrest. An in vitro matrigel invasion assay of SAM-treated cells showed a significant reduction in the invasive potential compared to untreated SW-620 cells. Treatment of SW-620 cells with SAM resulted in activation of TIMP-2 and inhibition of the expression of genes such as MMP (MMP-2, MT1-MMP), urokinase plasminogen activator, and vascular endothelial growth factors. The level of expression of tumor suppressor and apoptotic genes was not significantly higher compared to the untreated control. No changes in the levels of expression of genes (growth and cell cycle regulator), such as TGF-β, Smad2, Smad4, and p21 were observed. Our data support the hypothesis that TIMP-2, along with other prometastatic genes, is hypomethylated and expressed differently in colorectal cancer. Further in-depth analysis is warranted to confirm the promoter region CpG methylation pattern of the TIMP-2 gene. © FUNPEC-RP.

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