Khalid Aboura

Khalid Aboura
The American University of Armenia · Akian College of Science & Engineering

11.25
 · 
MS DSc Operations Research
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94
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239
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Introduction
Khalid does research in Probability Theory, Statistics and Applied Mathematics. His current project is 'Simulation Based Decision Support and Business Intelligence'.
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Research items (94)
Conference Paper
“Simulation Based Decision Support and Business Intelligence” was the title of the last conference session so many of us got used to attending at the Annual Meeting of the International Institute for Advanced Studies (IIAS) and the International Conference on Systems Research, Informatics and Cybernetics in Baden-Baden, Germany. The symposium was o...
Conference Paper
Distribution of collisions per particular agent in agent-based market absorption model is considered, where the random initial positions are set and random x-y velocities within range [-0.5, 0.5). Agent class has been defined and object oriented JavaScript code is provided. 135 simulation runs were conducted for 10,000 time steps in order to determ...
Conference Paper
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Stability is an important aspect of wireless power transfer systems. For example, most biomedical applications require efficient stable wireless charging. The shape of the transmitter antenna in wireless power transfer system also enhances its performance. This paper studies the performance of conical coil transmitters that are pyramidal shaped. Th...
Conference Paper
Full-text available
Cooperative communication and relaying are well established diversity techniques in modern radio frequency (RF) communication systems. Numerous schemes have been developed for RF relay solutions. Currently there are no similar relaying and diversity schemes for inductive communication systems. This paper proposes inductive relay models and presents...
Conference Paper
Some time ago, I presented a paper at a conference in Liege, Belgium. It was 2007 and the Eighth International Conference on Computing Anticipatory Systems, August 6-11. The conference was held at the University of Liege for many years by a well-known Professor, Daniel Dubois. It attracted a large crowd of scientist from all over the world. I met P...
Article
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We explore the problem of License Plate Recognition (LPR) to highlight a number of algorithms that can be used in image analysis problems. In management support systems using image object recognition, the intelligence resides in the statistical algorithms that can be used in various LPR steps. We describe a number of solutions, from the initial thr...
Conference Paper
Full-text available
“Simulation Based Decision Support and Business Intelligence” was the title of the conference session many of us got used to attending at the Annual Meeting of the International Institute for Advanced Studies (IIAS) and the International Conference on Systems Research, Informatics and Cybernetics in Baden-Baden, Germany. The symposium was organized...
Conference Paper
Full-text available
Simulation is used extensively in many industries. For example, in the design of complex parts of automotive systems it is an indispensable tool. Similarly, in the design of new materials, it can help with the exponential complexity of the geometries involved. But simulation runs can be computationally expensive. Even sophisticated simulation progr...
Conference Paper
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In wireless power transfer systems, the position of a receiver is very important in relation to where the transmitter is. Most resistor-inductor-capacitor circuits may result in a resonant frequency which varies with the coupling coefficient. The coupling coefficient can affect the resonant frequency and cause it to disappear resulting instead in o...
Conference Paper
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We describe work done some years ago that resulted in an efficient Naive Bayes classifier for character recognition. The original idea was to develop a probabilistic solution for a well known recognition problem where implemented solutions consisted mostly of Neural Network variants and distance based algorithms known as Template Matching. After mu...
Conference Paper
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The design of inductive energy transfer systems have to date depended on the use of one frequency source for exciting the system which makes it not scalable and limited to very short ranges. This paper reports on a study of an innovative technique for wide area inductive energy transfer systems using multiple frequency sources. A Class-E power ampl...
Article
In this paper we present an exact method for computing the Weibull renewal function and its derivative for application in maintenance optimization. The computational method provides a solid extension to previous work by which an approximation to the renewal function was used in a Bayesian approach to determine optimal replacement times. In the main...
Article
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Background: In the mid-1990s, a decision support system for copper production was developed for one of the largest mining companies in Australia. The research was conducted by scientists from the largest Australian research center and involved the use of simulation to analyze options to increase production of a copper production facility. Objective...
Article
In this article, a complete thermo-dynamical analysis has been made for the peristaltic motion of a viscous fluid with variable viscosity in a symmetric channel. The entire study is carried out in a moving frame of reference. The governing equations are normalized and exact solutions are obtained. The causes of entropy production in the peristaltic...
Conference Paper
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An analysis has been made to discuss the three-dimensional axisymmetric flow between two parallel infinite rotating stretchable disks at different rotating and stretching velocities. The similarity equations for the considered flow problem are solved numerically using the homotopy analysis method and a comparison of our analytical solution has been...
Conference Paper
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We describe a series of algorithms for recognition in image analysis. In management support systems using image object recognition, the intelligence resides in the statistical algorithms rather than in the image processing. Image processing transforms information from the real world into image data represented by matrices. The manipulation of these...
Article
Full-text available
Background: The Weibull distribution is one of the most important lifetime distributions in applied statistics. Weibull analysis is the leading method in the world for fitting and analyzing lifetime data. We discuss one of the earliest decision support system for the assessment of a distribution for the parameters of the Weibull reliability model u...
Article
License Plate Recognition (LPR) is a well-known problem and it has developed as a coherent framework. Research continues on the topic due to the diversity of license plates and outdoor illumination conditions which require attention. One of the most important steps in LPR is the localization part where license plates are extracted from video captur...
Article
Full-text available
The evaluation of traffic in a system is an important measurement in many studies. Counting the number of items in a system has applications in all processing operations. Electronic messages circulating in a network, clients shopping in a supermarket and students attending programs in a school are examples of entities entering, staying and exiting...
Conference Paper
Full-text available
The evaluation of traffic in a system is an important measurement in many studies. Counting the number of items in a system has applications in all processing operations. Electronic messages circulating in a network, clients shopping in a supermarket, students attending programs in a school, all are examples of entities entering, staying and exitin...
Conference Paper
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The Black-Scholes formula is one of the most successful mathematical models in finance, generating a global industry and resulting in two Nobel prizes. And yet, some speculate about its contribution to the last global financial crisis due to the abuse of a model that wasn't quite perfect. Some of the automation may have led to deficiencies in estim...
Conference Paper
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One of the important steps in the recognition of a license plate in an image is locating the license plate in the captured image. From the localized area, image regions are extracted and recognized as characters, leading to the identification of the vehicle. License plate recognition is a known problem and many contributions have been made to its r...
Article
Full-text available
This paper presents a procedure for determining optimal times for the replacement of a large number of identical items operating under similar conditions. A collective maintenance policy is considered due to the prohibitive cost of individual replacement upon failure. Replacements of all items occur at prescribed points in time, assuming that a rea...
Article
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We discuss the concept of simulation and its application in the resolution of problems in complex industrial systems. Most problems of serious scale, be it an inventory problem, a production and distribution problem, a management of resources or process improvement, all real world problems require a mix of generic, data algorithmic and Ad-hoc solut...
Article
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This paper introduces an information system for estimating lifetime characteristics of elements of bridges and predicting the future conditions of networks of bridges. The Information System for Bridge Networks Condition Monitoring and Prediction was developed for the Roads and Traffic Authority of the state of New South Wales, Australia. The conce...
Technical Report
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Since the advent of the internet as a commercial entity, a lot of research has been conducted on how to use the new technology in advertising. Many areas were investigated such as predicting web site audience demographics, forecasting the number of impressions, designing optimal schedules, measuring effectiveness, determining pricing and optimizing...
Chapter
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Traditionally, bridge management systems were designed using a Markov chain decision model. Based on the analysis of 15 years of bridge inspection data, we apply the gamma process instead. After ex-tracting all elevant information, enough data was collected on the condition paths of elements to build a deterioration model. The element conditions fo...
Article
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While the existing spatiotemporal approaches provide an estimation of the rainfall over geographical areas, they in effect provide only for an interpolation of the data. The proposed approach introduces the concept of the construction of the likelihood function of the repartition of rain over a territory using historical storm data, both radar and...
Article
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Electromagnetic fields radiation has raised concerns within several segments of the population in the past three decades. Many studies proved inconclusive, in part due to the scarcity of data. We propose the idea of a geographical model based radiation pollution database. We discuss networked sensing technology for detection and monitoring of elect...
Article
Full-text available
Radio frequency spectrum mapping allows determining the radio frequency signatures prevalent within an environment. We address the primary frequency bands used for cellular, wireless Local Area Network (LAN), Universal Mobile Telecommunications System (UMTS) and Ultra-wideband (UWB) communications. The purpose of the experiment presented in this pa...
Article
Full-text available
Classification is an important task in image analysis. Simply recognizing an object in an image can be a daunting step for a computer algorithm. The methodologies are often simple but rely heavily on the thresholding of the image. The operation of turning a color or gray-scale image into a black and white image is a determining step in the effectiv...
Technical Report
In collaboration with the University of Technology Sydney (UTS), the Roads and Traffic Authority of New South Wales (RTA) developed BNCM, a software for Bridge Network Condition Monitoring. The software has a statistical model to predict the future condition of bridges using bridge conditioninspection data. This User's Manual is a guide for the use...
Conference Paper
Full-text available
Electromagnetic Fields radiation has raised concerns within several segments of the population in the past three decades. Many studies proved inconclusive mainly due to the scarcity of the data. We propose an architecture for a geographical model based radiation pollution database, and discuss its benefits to the community at large.
Article
Full-text available
We introduce an approach for modelling the structural deterioration of components of bridges for maintenance optimization purposes. The Markov chain model is found in the maintenance and repair problems since the early 60's, is introduced to the maintenance of road infrastructure in the 1980's, and is made to drive the current bridge maintenance op...
Chapter
Full-text available
Traditionally, bridge management systems were designed using Markov chain models. Recently, researchers applied the gamma process successfully to structural deterioration problems. The stochastic process captures the temporal variability of degradation, and has been applied to a range of problems in structures. We report on a study for the modellin...
Conference Paper
Full-text available
Radio frequency spectrum mapping allows determining the radio frequency signatures prevalent within an environment. We address the primary frequency bands used for cellular, wireless LAN, UMTS and ultra wideband communications. The purpose of this paper is to map the detected radio frequencies within an environment and display the collated data on...
Conference Paper
Full-text available
A large number of thresholding methods exist. These methods perform differently in various image analysis problems where they are often used locally. They are not as effective globally. Global thresholding is a difficult task in most problems. We highlight a linear regression based global thresholding method that performed well in an engineering pr...
Technical Report
The Roads and Tra±c Authority of NSW (RTA) has over 5000 bridges in the road network under its jurisdiction. These structures were built from different materials, at di®erent times, under di®erent design codes with different articulations and are exposed to di®erent environments. The levels and rates of deterioration of these structures vary greatl...
Technical Report
The Roads and Tra ffic Authority of NSW (RTA) has over 5000 bridges in the road network under its jurisdiction. These structures were built from different materials, at different times, under different design codes with different articulations and are exposed to different environments. The levels and rates of deterioration of these structures vary...
Conference Paper
Full-text available
Structural health monitoring is a vital part in the management of bridges, particularly as the structures begin to age. Detecting structural faults through the use of sensors is an emerging field that has seen considerable efforts this past decade. Similarly, the use of sensors in bridge management systems provides valuable data on the condition of...
Conference Paper
Full-text available
The Markov chain model can be found in the maintenance and repair problems since the early 60's, is introduced to the maintenance of road infrastructure in the 1980's, and is made to drive the current bridge maintenance optimization systems. While this model results into solvable programming problems and provides a solution, there are a number of c...
Chapter
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The purpose for wireless sensor networks is to deploy low cost sensors with sufficient computing and communication capabilities to support networked sensing applications. The emphasis on lower cost led to sensors that are less accurate and less reliable than their wired sensor counterparts. Sensors usually suffer from both random and systematic bia...
Conference Paper
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Previous studies have investigated communications between regions of space and have considered the effect of antenna volume in determining the theoretical capacity of multiple-input multiple-output (MMO) communications systems. In this paper the effects of antenna <sup>1</sup>volume on available bandwidth for MIMO systems is considered. It is demon...
Conference Paper
Full-text available
This paper introduces a new trust model and a reputation system for wireless sensor networks based on a sensed continuous data. It establishes the continuous version of the beta reputation system and applied to binary events and presents a new Gaussian reputation system for sensor networks (GRSSN) . We introduce a theoretically sound Bayesian proba...
Article
Licence plate recognition (LPR) is a well studied problem first attempted in the 1970s. The image analysis part in LPR renders the problem hard to solve perfectly, leading to continued research. A defining step is the thresholding of the image to separate an object in the image from its background. While considerable effort has been devoted to LPR,...
Chapter
Full-text available
This paper surveys the state of the art trust-based systems in Wireless Sensor Networks (WSN); it highlights the difference between Mobile ad hoc networks (MANET) and WSN and based on this observed difference (monitoring events and reporting data) a new trust model is introduced, which takes sensor reliability as a component of trust. A new definit...
Conference Paper
Full-text available
Real time pedestrian flow information and the count of people in determined areas is essential for a multitude of management and monitoring functions. The range of applications is wide and the focus here is on the development of statistical methods for people volume estimation in buildings. To count people, visual information from surveillance came...
Technical Report
License plate recognition (LPR) is a well studied problem. Many contributions have been made to solving most of the problem since it was invented in 1976 at the Police Scientific Development Branch in the UK. Since then, working systems have been deployed in several countries and Britain is to become the �first country in the world where the moveme...
Technical Report
License plate recognition (LPR) is a well studied problem. Many contributions have been made to solving most of the problem since it was invented in 1976 at the Police Scienti�c Development Branch in the UK. Since then, working systems have been deployed in several countries and Britain is to become the �rst country in the world where the movements...
Article
Full-text available
A case study involving the use of simulation to analyze options to increase production of a copper production facility in Australia is reported here. A detailed and accurate model was developed capturing the factors affecting production and materials handling. The study resulted in prototype software with an Excel-based interface that allows the us...
Conference Paper
A simulation model was developed for evaluating and comparing different alternatives to the existing production/distribution system of a major explosives manufacturing company. A statistical model was developed for the daily demand from the mining customers. The simulation provided insight into the company's operations and helped select an expansio...
Conference Paper
Informed judgement consisting of reliability estimates is used to assess prior distributions for the parameters of the Weibull and Generalized Gamma models. The approach is used to initiate adaptive maintenance plans in large scale structures. Examples are the replacement of light bulbs in city streets and large department stores.