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Riyadh, Saudi Arabia

Imam Muhammad ibn Saud Islamic University in Riyadh, Saudi Arabia, was founded in 1953. In 1974, it was granted university status by royal decree. The university houses 10 faculties. It currently has more than 24,000 students and 1,300 faculty. It has intermediate and secondary Islamic institutes in major cities of Saudi Arabia, Ras al-Khaimah, the USA, Indonesia, Malaysia, Djibouti and Japan. The university as a cultural and intellectual institution aims to promote knowledge offering undergraduate as well as postgraduate studies. One of the most important aims is to promote translating and publishing as the university has its own print house. Moreover, the university achieves its goals within the Islamic Shari'a. Wikipedia.


Tamimi A.I.,Imam Muhammad ibn Saud Islamic University
Journal of Renewable and Sustainable Energy | Year: 2011

A generalized analytical model was developed to determine the optimum inclination angle of flat-plate solar collector for any location worldwide. The developed analytical model was found to be directly related to the latitude of the location under consideration, the declination angle of the earth axis, and the day hour angle at sunset s at any day throughout the year. The optimum inclination angle opt was expressed by a generalized mathematical model. This model was applied to Amman, Jordan. The results were compared with those calculated by NASA and showed very good agreement. © 2011 American Institute of Physics. Source


Ahmed Z.H.,Imam Muhammad ibn Saud Islamic University
Transactions on Embedded Computing Systems | Year: 2013

The bottleneck traveling salesman problem is to find a Hamiltonian circuit that minimizes the largest cost of any of its arcs in a graph. A simple genetic algorithm (GA) using sequential constructive crossover has been developed to obtain heuristic solution to the problem. The hybrid GA incorporates 2-opt search, another proposed local search and immigration to the simple GA for obtaining better solution. The efficiency of our hybrid GA to the problem against two existing heuristic algorithms has been examined for some symmetric TSPLIB instances. The comparative study shows the effectiveness of our hybrid algorithm. Finally, we present solutions to the problem for asymmetric TSPLIB instances. © 2013 ACM. Source


Ahmed Z.H.,Imam Muhammad ibn Saud Islamic University
Mathematical Problems in Engineering | Year: 2011

A simple lexisearch algorithm that uses path representation method for the asymmetric traveling salesman problem (ATSP) is proposed, along with an illustrative example, to obtain exact optimal solution to the problem. Then a data-guided lexisearch algorithm is presented. First, the cost matrix of the problem is transposed depending on the variance of rows and columns, and then the simple lexisearch algorithm is applied. It is shown that this minor preprocessing of the data before the simple lexisearch algorithm is applied improves the computational time substantially. The efficiency of our algorithms to the problem against two existing algorithms has been examined for some TSPLIB and random instances of various sizes. The results show remarkably better performance of our algorithms, especially our data-guided algorithm. © 2011 Zakir Hussain Ahmed. Source


Al-Shafei A.I.M.,Imam Muhammad ibn Saud Islamic University
Blood Pressure | Year: 2014

Background and aim. Effects of Ramadan fasting on health are important. Its effects on arterial pulse pressure (PP), lipid profile and oxidative stress were characterized in hypertensives. Methods. PP, indices of lipid profile and oxidative stress were measured pre-, during and post-fasting in equal (40 each), sex- and age-matched groups (age 55 ± 5 years) of hypertensives (HT) and controls (C). Results. Fasting reduced PP significantly by 17.2% and insignificantly by 9.3% in the HT and C groups, respectively. Total cholesterol (TC) was lowered insignificantly by 11.7% and 4.7% in the HT and C patients, respectively. Triglycerides (TG) and malondialdehyde (MDA) were significantly lowered by: TG: 24.5% and 22.8%; MDA: 45.6% and 54.3%; while glutathione (GSH) elevated by 56.8% and 52.6% in the HT and C groups, respectively. High-density lipoproteins (HDL) were raised significantly by 33.3% and insignificantly by 6.7%, whereas low-density lipoproteins (LDL) decreased significantly by 17.7% and insignificantly by 4.0% in the HT and C groups, respectively. At 6 weeks post-fasting, MDA remained significantly lower than the pre-fasting level by 24.3% and 25.7%, and GSH higher by 30.2% and 26.3% in the HT and C groups, respectively, while PP and TC returned to pre-fasting values in both groups. The post-fasting, HDL was significantly higher by 20.3% and LDL lower by 12.0% than the fasting levels in the HT patients. Conclusion. Fasting improves PP and lipids profile and ameliorates oxidative stress in hypertensives. © 2014 Scandinavian Foundation for Cardiovascular Research. Source


Ahmed Z.H.,Imam Muhammad ibn Saud Islamic University
OPSEARCH | Year: 2013

We consider the clustered travelling salesman problem in which vertices (except the starting vertex) of the network are divided into some prespecified clusters. The problem is to find a least cost Hamiltonian cycle (tour) in which vertices of any cluster are visited contiguously and the clusters are visited in the prespecified order. The problem is NP-hard and it arises in practical transportation and sequencing problems. This paper develops a lexisearch algorithm for obtaining exact optimal solution to the problem. The efficiency of the algorithm against an existing algorithm to the problem has been examined for asymmetric TSPLIB instances of various sizes and clusters. Finally, we present solutions to some symmetric TSPLIB instances. © 2012 Operational Research Society of India. Source

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