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Search Results: 1 - 10 of 6871 matches for " Muhammad Duraid "
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The Implementation and Lateral Control Optimization of a UAV Based on Phase Lead Compensator and Signal Constraint Controller  [PDF]
Adil Loya, Muhammad Duraid, Kamran Maqsood, Rehan Rasheed Khan
Engineering (ENG) , 2018, DOI: 10.4236/eng.2018.1010051
Abstract: Unmanned Aero Vehicles (UAV) has become a useful entity for quite a good number of industries and facilities. It is an agile, cost effective and reliable solution for communication, defense, security, delivery, surveillance and surveying etc. However, their reliability is dependent on the resilient and stabilizes performance based on control systems embedded behind the body. Therefore, the UAV is majorly dependent upon controller design and the requirement of particular performance parameters. Nevertheless, in modern technologies there is always a room for improvement. In the similar manner a UAV lateral control system was implemented and researched in this study, which has been optimized using Proportional, Integral and Derivative (PID) controller, phase lead compensator and signal constraint controller. The significance of this study is the optimization of the existing UAV controller plant for improving lateral performance and stability. With this UAV community will benefit from designing robust controls using the optimized method utilized in this paper and moreover this will provide sophisticated control to operate in unpredictable environments. It is observed that results obtained for optimized lateral control dynamics using phase lead compensator (PLC) are efficacious than the simple PID feedback gains. However, for optimizing unwanted signals of lateral velocity, yaw rate, and yaw angle modes, PLC were integrated with PID to achieve dynamical stability.
A system for reflection in C++
Duraid Madina,Russell K. Standish
Computer Science , 2004,
Abstract: Object-oriented programming languages such as Java and Objective C have become popular for implementing agent-based and other object-based simulations since objects in those languages can {\em reflect} (i.e. make runtime queries of an object's structure). This allows, for example, a fairly trivial {\em serialisation} routine (conversion of an object into a binary representation that can be stored or passed over a network) to be written. However C++ does not offer this ability, as type information is thrown away at compile time. Yet C++ is often a preferred development environment, whether for performance reasons or for its expressive features such as operator overloading. In this paper, we present the {\em Classdesc} system which brings many of the benefits of object reflection to C++.
ClassdescMP: Easy MPI programming in C++
Russell K. Standish,Duraid Madina
Computer Science , 2004,
Abstract: ClassdescMP is a distributed memory parallel programming system for use with C++ and MPI. It uses the Classdesc reflection system to ease the task of building complicated messages to be sent between processes. It doesn't hide the underlying MPI API, so it is an augmentation of MPI capabilities. Users can still call standard MPI function calls if needed for performance reasons.
Classdesc and Graphcode: support for scientific programming in C++
Russell K. Standish,Duraid Madina
Computer Science , 2006,
Abstract: Object-oriented programming languages such as Java and Objective C have become popular for implementing agent-based and other object-based simulations since objects in those languages can {\em reflect} (i.e. make runtime queries of an object's structure). This allows, for example, a fairly trivial {\em serialisation} routine (conversion of an object into a binary representation that can be stored or passed over a network) to be written. However C++ does not offer this ability, as type information is thrown away at compile time. Yet C++ is often a preferred development environment, whether for performance reasons or for its expressive features such as operator overloading. In scientific coding, changes to a model's codes takes place constantly, as the model is refined, and different phenomena are studied. Yet traditionally, facilities such as checkpointing, routines for initialising model parameters and analysis of model output depend on the underlying model remaining static, otherwise each time a model is modified, a whole slew of supporting routines needs to be changed to reflect the new data structures. Reflection offers the advantage of the simulation framework adapting to the underlying model without programmer intervention, reducing the effort of modifying the model. In this paper, we present the {\em Classdesc} system which brings many of the benefits of object reflection to C++, {\em ClassdescMP} which dramatically simplifies coding of MPI based parallel programs and {\em Graphcode} a general purpose data parallel programming environment.
Plasma Internal Energy for Toroidal Elliptic Plasmas with Triangularity  [PDF]
Muhammad Asif
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.21002
Abstract: The Plasma internal energy is not conserved on a magnetic surface if nonlinear flows are considered. The analysis here presented leads to a complicated equation for the plasma internal energy considering nonlinear flows in the collisional regime, including viscosity and in the low-vorticity approximation. Tokamak equilibrium has been analyzed with the magnetohydrodynamics nonlinear momentum equation in the low vorticity case. A generalized Grad–Shafranov-type equation has been also derived for this case.
Dressing after Dressing: Sadra’s Interpretation of Change  [PDF]
Muhammad Kamal
Open Journal of Philosophy (OJPP) , 2013, DOI: 10.4236/ojpp.2013.31009
Abstract:

This paper deals with the doctrine of transubstantial change advocated by Mulla Sadra in which substances as well as accidents are thought to be in constant and gradual change. Against Aristotle’s doctrine of accidental change, Mulla Sadra argues that no stable ground can bring about change and since substance is renewable it cannot carry identity of a changing existent. Here we investigate whether identity is possible or not. If it is possible then what becomes a ground for establishing identity of changing substances.

Intelligent Approaches for Vectorizing Image Outlines  [PDF]
Muhammad Sarfraz
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B016
Abstract: Two computing approaches, based on linear and conic splines, are proposed here in reviewed and extended for vectorizing image outlines. Both of the approaches have various phases including extracting outlines of images, detecting corner points from the detected outlines, and curve fitting. Interpolation splines are the bases of the two approached. Linear spline approach is straight forward as it does not have a degree of freedom.in terms of some shape controller in its description. However, the idea of the soft computing approach, namely simulated annealing, has been utilized for conic splines. This idea has been incorporated to optimize the shape parameters in the description of the generalized conic spline. Both of the linear and conic approaches ultimately produce optimal results for the approximate vectorization of the digital contours obtained from the generic shapes.
Travelling Wave Solution of the Fisher-Kolmogorov Equation with Non-Linear Diffusion  [PDF]
Muhammad Shakeel
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A021
Abstract: In this paper we study one-dimensional Fisher-Kolmogorov equation with density dependent non-linear diffusion. We choose the diffusion as a function of cell density such that it is high in highly cell populated areas and it is small in the regions of fewer cells. The Fisher equation with non-linear diffusion is known as modified Fisher equation. We study the travelling wave solution of modified Fisher equation and find the approximation of minimum wave speed analytically, by using the eigenvalues of the stationary states, and numerically by using COMSOL (a commercial finite element solver). The results reveal that the minimum wave speed depends on the parameter values involved in the model. We observe that when diffusion is moderately non-linear, the eigenvalue method correctly predicts the minimum wave speed in our numerical calculations, but when diffusion is strongly non-linear the eigenvalues method gives the wrong answer.
Removal of Pesticides from Water Using Granular Activated Carbon and Ultrafiltration Membrane—A Pilot Plant Study  [PDF]
Muhammad Zahoor
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2013, DOI: 10.4236/jeas.2013.33009
Abstract:

The use of powdered activated carbon for fouling control in the membrane processes is limited by some secondary problems associated with its use, like cake formation, long backwash times and blackening of pipes. Granular activated carbon (GAC) was used as an alternative of powdered activated carbon due to its large particle size which was kept from being entering into the membrane system. The secondary problems associated with the use of powdered activated carbon as foul control were not observed for granular activated carbon. Langmuir and Freundlich adsorption were used to describe the adsorption of 2,4-D and paraquat on GAC. Adsorption capacity of adsorbent was high for 2,4-D as compared to paraquat. Also, the R2 value was high for Langmuir model as compared to Freundlich model. Retention percentage of 2,4-D by membrane was high and thus the decline in permeate flux was high as compared to paraquat in ultrafiltration (UF) membrane process. 100% retention of 2,4-D was achieved in GAC/UF hybrid system. Improved permeate fluxes were observed for both contaminants in the hybrid system.

Challenges of Mass Casualty Management at a Regional Trauma Centre in Sub-Saharan Africa  [PDF]
Muhammad Oboirien
Health (Health) , 2014, DOI: 10.4236/health.2014.66068
Abstract: Background: Mass Casualty incidents usually overwhelm the capabilities of any centre. It is an event whose nature is undetermined, unexpected and disrupts the normal trauma care in a hospital. Hospitals have established protocols to deal with mass casualty when it arises. Objectives: We sought to profile the presentations of mass casualty incidents and challenges in management in a regional trauma Centre in North-West Nigeria. Methodology: A retrospective look at the records of mass casualty presentations in our centre over a 12-month period (January-December 2011) was done. A mass casualty event in our setting is the presentation to our facility of eight or more patients from the same cause at the same. Results: There were a total of 18 mass casualty presentations with an average of 1.5 per month. There were a total of 236 victims including those brought in dead (BID). Males were 203 (86%) and females 33 (16%) with an M:F ratio of 6:1. Majority of the victims 222 (94%) were above 16 years and all the victims had a common mechanism of injury which was Road traffic crashes. One hundred and forty-three (61%) of the victims sustained lacerations and bruises while 31 (13%) were polytraumatized. Sixty-two (26%) of the victims were BID’S from the scenes of the Road Crashes. The outcome was that 131 (75%) of the victims were treated and discharged while 41 (24%) were admitted for further management. Two (1%) patients died during resuscitation and within 24 hours. Conclusion: Mass casualty presentations are a regular event in our centre hence there is the need for the establishment of a protocol and regular mass casualty drills to cope with future occurrences.
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