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Search Results: 1 - 10 of 410997 matches for " S. O. Alotaibi "
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High Power Interleaved Boost Converter for Photovoltaic Applications  [PDF]
Ahmed A. Hafez, A. Y. Hatata, M. I. Alsubaihi, R. M. Alotaibi, F. T. Alqahtani, S. O. Alotaibi, A. M. Alhusayni, M. D. Alharbi
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.65001
Abstract: Interfacing DC sources to load/power grid requires DC converters that produce minimum level of current ripples. This is to limit the losses and hence increase the life span of these sources. This article proposes a simple inter-leaved boost converter that interfaces PhotoVoltaic (PV) module into a common DC-link. The article also addresses the faulty mode operation of the proposed circuit while advising the appropriate remedy actions. A MATLAB and Simulink dynamic platform are used to simulate the transient performance of the proposed converter. The results revealed the effectiveness and the viability of the proposed converter in reducing the ripples in the PV current without employing bulky input inductors or increasing the switching frequency.
Tuberculosis Trends in Saudis and Non-Saudis in the Kingdom of Saudi Arabia – A 10 Year Retrospective Study (2000–2009)
Mohammad S. Abouzeid, Alimuddin I. Zumla, Shaza Felemban, Badriah Alotaibi, Justin O’Grady, Ziad A. Memish
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039478
Abstract: Background Tuberculosis (TB) remains a public health problem in the Kingdom of Saudi Arabia (KSA), which has a very large labour force from high TB endemic countries. Understanding the epidemiological and clinical features of the TB problem, and the TB burden in the immigrant workforce, is necessary for improved planning and implementation of TB services and prevention measures. Methods A 10 year retrospective study of all TB cases reported in KSA covering the period 1st January 2000 to 31st December 2009. Data was obtained from TB reporting forms returned to the Ministry of Health. Data were then organised, tabulated and analysed for annual incidence rates by province, nationality, country of origin and gender. Results There was an annual increase in the number of TB cases registered from 3,284 in 2000 to 3,964 in 2009. Non-Saudis had nearly twice the TB incidence rate compared to Saudis (P = <0.05). All but four provinces (Najran, Riyadh, Makkah, Tabuk) showed decreasing TB incidence rates. The highest rates were seen in the 65+ age group. In the 15–24 year age group the incidence rate increased from 15.7/100,000 in 2000 to 20.9/100,00 in 2009 (P = <0.05). The incidence of TB in Saudi males was higher than Saudi females. Conversely, for non-Saudis the TB incidence rates were significantly higher in females compared to males. Conclusions Despite significant investments in TB control over 15 years, TB remains an important public health problem in the KSA affecting all age groups, and Saudis and non-Saudis alike. Identification of the major risk factors associated with the persistently high TB rates in workers migrating to KSA is required. Further studies are warranted to delineate whether such patients re-activate latent Mycobacterium tuberculosis (M.tb) infection or acquire new M.tb infection after arrival in KSA. Appropriate interventions are required to reduce TB incidence rates as have been implemented by other countries.
Implementing portfolio in postgraduate general practice training. Benefits and recommendations
Fawaz S. Alotaibi
Saudi Medical Journal , 2012,
Abstract: This paper presents a review to explore the literature focusing on portfolio in postgraduate general practice (GP) training, and to examine the impact of implementation of portfolio on learning process, as well as proposing recommendations for its implementation in postgraduate GP training. An electronic search was carried out on several databases for studies addressing portfolio in postgraduate GP training. Six articles were included to address specifically the effectiveness of portfolio in postgraduate GP training. Five of them described successful experiences of portfolio-based learning implementation. Only one article addressed portfolio-based assessment in postgraduate GP training. The existing evidence provides various benefits of professional portfolio-based learning. It does appear to have advantages of stimulating reflective learning, promoting proactive learning, and bridging the hospital experiences of the learners to GP. Moreover, the challenges to implementation of portfolio-based learning are often based on orientation and training of stakeholders.
On Coupled Fixed Point Theorems for Nonlinear Contractions in Partially Ordered -Metric Spaces
S. A. Mohiuddine,Abdullah Alotaibi
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/897198
Almost Conservative Four-Dimensional Matrices through de la Vallée-Poussin Mean
S. A. Mohiuddine,Abdullah Alotaibi
Abstract and Applied Analysis , 2014, DOI: 10.1155/2014/412974
Abstract: The purpose of this paper is to generalize the concept of almost convergence for double sequence through the notion of de la Vallée-Poussin mean for double sequences. We also define and characterize the generalized regularly almost conservative and almost coercive four-dimensional matrices. Further, we characterize the infinite matrices which transform the sequence belonging to the space of absolutely convergent double series into the space of generalized almost convergence. 1. Introduction and Preliminaries Let be the Banach space of real bounded sequences with the usual norm . There exist continuous linear functionals on called Banach limits [1]. It is well known that any Banach limit of lies between and . The idea of almost convergence of Lorentz [2] is narrowly connected with the limits of S. Banach; that is, a sequence is almost convergent to if all of its Banach limits are equal. As an application of almost convergence, Mohiuddine [3] obtained some approximation theorems for sequence of positive linear operator through this notion. For double sequence, the notion of almost convergence was first introduced by Móricz and Rhoades [4]. The authors of [5] introduced the notion of Banach limit for double sequence and characterized the spaces of almost and strong almost convergence for double sequences through some sublinear functionals. For more details on these concepts, one can refer to [6–12]. We say that a double sequence of real or complex numbers is bounded if denoted by , the space of all bounded sequence . A double sequence of reals is called convergent to some number in Pringsheim’s sense (briefly, -convergent to ) [13] if for every there exists such that whenever , where . If a double sequence in and is also -convergent to , then we say that it is boundedly -convergent to (briefly, -convergent to ). A double sequence is said to converge regularly to (briefly, -convergent to ) if is converges in Pringsheim’s sense, and the limits and exist. Note that in this case the limits and exist and are equal to the -limit of . Throughout this paper, by , , and , we denote the space of all -convergent, -convergent, and -convergent double sequences, respectively. Also, the linear space of all continuous linear functionals on is denoted by . Let be a four-dimensional infinite matrix of real numbers for all , and a space of double sequences. Let be a double sequences space, converging with respect to a convergence rule . Define Then, we say that a four-dimensional matrix maps the space into the space if and is denoted by . Móricz and Rhoades [4] extended the
Clinical Outcomes Associated with Use of Subcutaneous Sliding Scale Insulin Compared to Other Insulin Regimens in Hospitalized Patients  [PDF]
Lama S. Alfehaid, Abdulmalik S. Alotaibi, Ahmed S. Alanazi, Rami T. Bustami, Razan El Melik
International Journal of Clinical Medicine (IJCM) , 2018, DOI: 10.4236/ijcm.2018.94023
Abstract: Background: Hyperglycemia in hospitalized patients is managed through one of the following approaches: sliding scale insulin (SSI) alone; SSI plus long-acting insulin and basal-bolus insulin (BBI). The optimal insulin treatment regimen is still debated. Objectives: To evaluate the clinical outcomes associated with the use of SSI compared to other regimens. Setting: The general medical wards in King Abdulaziz Medical City, Riyadh, Saudi Arabia. Methods: Medical charts for adult patients admitted between October 2014-December 2015 with type 2 diabetes or uncontrolled hyperglycemia with insulin treatment were reviewed. Data from capillary blood glucose were measured daily for the first 5 days of hospitalization and recorded. Demographics and blood glucose levels were compared by group using one-way ANOVA or Chi-square test. The number of hyperglycemic/hypoglycemic episodes was analyzed using the Kruskal-Wallis test. Results: A total of 240 patients were included. The three insulin regimen groups were not statistically different in terms of the number of days with episodes of hyper- or hypoglycemia (p > 0.05). However, a significantly bigger change from baseline (improvement) in random blood glucose (RBG) levels was observed in BBI and SSI plus glargine patients compared to SSI (p = 0.014). Conclusion: Our study showed no significant difference in the number of days with episodes of hyper- or hypoglycemia for SSI vs. other insulin regimens. However, SSI patients had less improvement in their RBG levels compared to other insulin regimen groups. Further studies with a larger sample size are needed to confirm these findings.
Conventional and Improved Digital Signature Scheme: A Comparative Study  [PDF]
Alaa D. Alrehily, Asmaa F. Alotaibi, Suzan B. Almutairy, Mashael S. Alqhtani, Jayaprakash Kar
Journal of Information Security (JIS) , 2015, DOI: 10.4236/jis.2015.61007
Abstract: Due to the rapid growth of online transactions on the Internet, authentication, non-repudiation and integrity are very essential security requirements for a secure transaction. To achieve these security goals, digital signature is the most efficient cryptographic primitive. Many authors have proposed this scheme and prove their security and evaluate the efficiency. In our paper, we present comprehensive study of conventional digital signature schemes based on RSA, DSA and ECDSA (Elliptic Curve Digital Signature Algorithm) and the improved version of these scheme.
Statistical Convergence of Double Sequences in Locally Solid Riesz Spaces
S. A. Mohiuddine,Abdullah Alotaibi,M. Mursaleen
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/719729
Abstract: Recently, the notion of statistical convergence is studied in a locally solid Riesz space by Albayrak and Pehlivan (2012). In this paper, we define and study statistical -convergence, statistical -Cauchy and -convergence of double sequences in a locally solid Riesz space.
Statistical Approximation for Periodic Functions of Two Variables
Abdullah Alotaibi,M. Mursaleen,S. A. Mohiuddine
Journal of Function Spaces , 2013, DOI: 10.1155/2013/491768
Abstract: We prove a Korovkin type approximation theorem for a function of two variables by using the notion of statistical summability . We also study the rate of statistical summability of positive linear operators. Finally we construct an example to show that our result is stronger than those previously proved for Pringsheim's convergence and statistical convergence.
The Common Complications after Septoplasty and Septorhinoplasty: A Report in a Series of 127 Cases  [PDF]
Abdullah D. Alotaibi
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2017, DOI: 10.4236/ijohns.2017.66010
Abstract: Background: There are many complications associated with septoplasty, which chiefly depend on the procedure performed. The aim of this study was to find out the common complications after Septoplasty and Septorhinoplasty in a series of 127 Saudi patients undergoing Septoplasty or Septorhinoplasty in Northern Saudi Arabia. Methodology: This study included a series of 127 patients presented with nasal blockage and subsequently undergone Septoplasty and /or Septorhinoplasty. Results: Complications were determined in 69/127 (54.3%) of the patients. The most common complication after three months of septoplasty or Septorhinoplasty was the change in the shape of the nose, which represented 57 (82.6%) out of 69 patients with complications. Bleeding was experienced in 8 patients of whom 5/8 (62.5%) were males and 3/8 (37.5%) were females. Conclusion: Nose deformities are the most common complication associated with Septoplasty or Septorhinoplasty in Northern Saudi Arabia. The risks for Septoplasty or Septorhinoplasty complications can be condensed with accumulative experience.
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