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Search Results: 1 - 10 of 4341 matches for " Zurni Omar "
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Solving Higher Order Ordinary Differential Equations Using Parallel 2-Point Explicit Block Method
Zurni Omar,Mohamed Suleiman
Matematika , 2005,
Abstract: The derivation of a new parallel 2-point explicit block (2PEB) method for solving dth order ordinary differential equations (ODEs) directly is made. Computational advantages are presented comparing the results obtained by the new method with that of conventional 1-point method. Numerical results suggest that the parallel 2PEB method is recommended for solving second order ODEs directly using finer step sizes.
Two-Point Predictor-Corrector Block Method for Solving Delay Differential Equations
Fuziyah Ishak,Mohamed Suleiman,Zurni Omar
Matematika , 2008,
Abstract: A 2-point variable order variable stepsize block method for the numerical solution of delay differential equations is described. The predictor-corrector formulae using divided difference formulation are implemented to produce two points simultaneously. This algorithm proves to be reliable, accurate and efficient. Furthermore, numerical experiments show that the block method reduces the number of total steps when compared with 1-point sequential method.
New Algorithm for Listing All Permutations
Haslinda Ibrahim,Zurni Omar,Azizah Mohd. Rohni
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n2p89
Abstract: The most challenging task dealing with permutation is when the element is large. In this paper, a new algorithm for listing down all permutations for n elements is developed based on distinct starter sets. Once the starter sets are obtained, each starter set is then cycled to obtain the first half of distinct permutations. The complete list of permutations is achieved by reversing the order of the first half of permutation. The new algorithm has advantages over the other methods due to its simplicity and easy to use.
Free Convection over a Vertical Plate in a Micropolar Fluid Subjected to a Step Change in Surface Temperature
Azizah Mohd. Rohni,Zurni Omar,Adyda Ibrahim
Modern Applied Science , 2009, DOI: 10.5539/mas.v3n1p22
Abstract: The Keller box method has been employed for free convection over a vertical plate subjected to a step change in surface temperature in micropolar fluid. Numerical results presented include the reduced angular velocity profiles, development of wall shear stress or skin friction and development of the rate of change of the gyration component at the wall for various values of Prandtl numbers and temperature ratios. The study shows that the present results obtained in micropolar fluids, when temperature ratio , agree very well with the previous study without temperature change.
Geometric Fractional Brownian Motion Perturbed by Fractional Ornstein-Uhlenbeck Process and Application on KLCI Option Pricing  [PDF]
Mohammed Alhagyan, Masnita Misiran, Zurni Omar
Open Access Library Journal (OALib Journal) , 2016, DOI: 10.4236/oalib.1102863
This paper presents an enhanced model of geometric fractional Brownian motion where its volatility is assumed to be stochastic volatility model that obeys fractional Ornstein-Uhlenbeck process. The method of estimation for all parameters (α, β, m, μ, H1, and H2) in this model is derived. We calculated the value of European call option using the estimates based on the methods of Masnita [1] [2] and Kukush [3], traditional Black-Scholes European option price, in addition to proposed model in order to make comparison study.
An Alternative Hotelling T^2 Control Chart Based on Minimum Vector Variance (MVV)
Sharifah Soaad Syed Yahaya,Hazlina Ali,Zurni Omar
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n4p132
Abstract: The performance of traditional Hotelling T2 control chart using classical estimators in Phase I suffers from masking and swamping effect. To alleviate the problem, robust location and scale estimators are recommended. This paper proposed a robust Hotelling T2 control chart for individual observations based on minimum vector variance (MVV) estimators as an alternative to the traditional multivariate T2 control chart for Phase II data. MVV is a new robust estimator which possesses the good properties as in minimum covariance determinant (MCD) with better computational efficiency. Through simulation study, we evaluate the performance of the proposed chart in terms of probability of detection and false alarm rates and compared with the performance of the traditional charts and the chart issued from MCD estimators. The results showed that MVV control chart has competitive performance relative to MCD and traditional control charts even under certain location parameter shifts in Phase I data.
Hard Decision-Based PWM for MIMO-OFDM Radar  [PDF]
Omar Daoud
Communications and Network (CN) , 2015, DOI: 10.4236/cn.2015.71004
Abstract: For the purpose of target localization, Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) radar has been proposed. OFDM technique has been adopted in order to a simultaneous transmission and reception of a set of multiple narrowband orthogonal signals at orthogonal frequencies. Although multi-carrier systems such as OFDM support high data rate applications, they do not only require linear amplification but also they complicate the power amplifiers design and increase power consumption. This is because of high peak-to-average power ratio (PAPR). In this work, a new proposition has been made based on the Pulse Width Modulation (PWM) to enhance the MIMO-OFDM radar systems’ performance. In order to check the proposed systems performance and its validity, a numerical analysis and a MATLAB simulation have been conducted. Nevertheless of the system characteristics and under same bandwidth occupancy and system’s specifications, the simulation results show that this work can reduce the PAPR values clearly and show capable results over the ones in the literature.
Numerical Investigation of Phase and Group Propagation of Time-Domain Signals in a Novel Band-Reject Metamaterial Ring Hybrid  [PDF]
Omar Siddiqui
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.36002
Abstract: Phase and group propagation in metamaterial-based microwave components has always been intellectually challenging for students and engineers new to the area of periodic structures and metamaterials. This paper aims in tackling this important topic by studying the wave propagation in a metamaterial-based microwave device. Hence, the contribution of this paper is twofold. First, design of a novel metamaterial ring hybrid (or rate-race) is presented which has a large rejection band so that the second and third harmonics are effectively suppressed. Second, the electromagnetic phase and the group propagation in the ring hybrid are investigated by numerically exciting the input ports with band-limited Gaussian pulses and then finding their responses at various locations in the device.
Investigation of the Quaternion Dynamical System  [PDF]
Yasmin Omar
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.51014
Abstract: The quaternion Mandelbrot set is one of the most important sets in mathematics. In this paper we first give some properties of the quaternion algebra. Then, we introduce the quternion dynamical system. We are concerned with analytical and numerical investigation of the quaternion dynamical system.
Pattern-Oriented Approach for Enterprise Architecture: TOGAF Framework  [PDF]
Mohamed Taleb, Omar Cherkaoui
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.51008
Abstract: Design pattern suggests that developers must be able to reuse proven solutions emerging from the best design practices to solve common design problems while composing patterns to create reusable designs that can be mapped to different types of enterprise frameworks and architectures such as The Open Group Architecture Framework (TOGAF). Without this, business analysts, designers and developers are not properly applying design solutions or take full benefit of the power of patterns as reuse blocks, resulting in poor performance, poor scalability, and poor usability. Furthermore, these professionals may “reinvent the wheel” when attempting to implement the same design for different types of architectures of TOGAF framework. In this paper, we introduce different categories of design patterns as a vehicle for capturing and reusing good analyses, designs and implementation applied to TOGAF framework while detailing a motivating exemplar on how design patterns can be composed to create generic types of architectures of TOGAF framework. Then, we discuss why patterns are a suitable for developing and documenting various architectures including enterprise architectures as TOGAF.
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