The Weibull distribution is one of the most important lifetime distributions in applied statistic... more 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 using expert information. We then present a different approach to assess the parameters distribution. Objectives: The studies mentioned in this paper aimed to construct a distribution of the parameters of the Weibull reliability model and apply it in the domain of Maintenance Optimization. Method: The parameters of the Weibull reliability model are considered random variables and a distribution for the parameters is assessed using informed judgment in the form of reliability estimates from vendor information, engineering knowledge or experience in the field. Results: The results are the development of modern maintenance optimization models that can be embodied in decision support systems. Conclusion: While the information management part is important in the building of maintenance optimization decision systems, the accuracy of the mathematical and statistical algorithms determines the level of success of the maintenance solution.
We discuss the concept of simulation and its application in the resolution of problems in complex... more 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 solutions making the best of available information. We describe two projects in which analytical solutions were applied or contemplated. the first case study uses linear programming in the optimal allocation of advertising resources by a major internet service provider. the second study, in a series of projects, analyses options for the expansion of the production and distribution network of mining products, as part of a sensitive strategic business review. using the examples, we make the case for the need of simulation in complex industrial problems where analytical solutions may be attempted but where the size and complexity of the problem forces a Monte carlo approach.
We describe a series of algorithms for recognition in image analysis. In management support syste... more 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 real valued matrices requires mathematical and statistical solutions in order to locate objects in the images and reach conclusions regarding problem targets. We describe a number of solutions, from the initial thresholding step to localization and recognition of image elements. Some of these techniques use frequency signals from the images which we analyze through the Discrete Fourier Transform. These algorithms, along with many others in the business of visual surveillance, provide the effectiveness for an ever prevalent form of building and properties management.
International Journal of Electronics and Telecommunications, 2010
Radio frequency spectrum mapping allows determining the radio frequency signatures prevalent with... more 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 ...
Modelling Trust in Wireless Sensor Networks from the Sensor Reliability Prospective
Innovative Algorithms and Techniques in Automation, Industrial Electronics and Telecommunications, 2007
Abstract - This paper surveys the state of the art trust-based systems in Wireless Sensor Network... more Abstract - 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 ...
Statistical analysis of the Discrete Fourier Transform for localization in an image
2013 Pan African International Conference on Information Science, Computing and Telecommunications (PACT), 2013
Bayesian analysis of stay times in a system
2013 Pan African International Conference on Information Science, Computing and Telecommunications (PACT), 2013
Bayesian Updating of the Gamma Distribution for the Analysis of StayTimes in a System
Journal of Machine to Machine Communications, 2014
Option pricing with informed judgment
2013 Pan African International Conference on Information Science, Computing and Telecommunications (PACT), 2013
International Journal of Electronics and Telecommunications, 2010
Electromagnetic fields radiation has raised concerns within several segments of the population in... more 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 electromagnetic fields. We elaborate on software engineering issues for the visualization in real time of electromagnetic field mappings and the dissemination of information through various means and levels of access. We propose the database be complimented by a data algorithmic software solution for the extraction of patterns.
Bandwidth utilisation for volume-to-volume UWB MIMO communications
2008 3rd International Symposium on Wireless Pervasive Computing, 2008
Previous studies have investigated communications between regions of space and have considered th... more 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 1volume on available bandwidth for MIMO systems is considered. It is demonstrated that while higher order modal connections can be established even for small antennas
Real time pedestrian flow information and the count of people in determined areas is essential fo... more 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 cameras is used. This is the first of a series of reports, where the problem is divided in estimation classes of increasing difficulty. In the initial stage, probability models are derived for the basic counting scenario, using data gathered from a single camera. The methodology is extended to more complex problems, making use of several cameras covering the same field of view. The consideration of all possible classes of estimation problems leads to solutions that culminate in the assessment of the total number of people in a building.
International Journal of Electronics and Telecommunications, 2010
Classification is an important task in image analysis. Simply recognizing an object in an image c... more 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 effectiveness of a solution. Thresholding methods perform differently in various problems where they are often used locally. Global thresholding is a difficult task in most problems. We highlight a pseudo Bayesian and a linear regression global thresholding methods that performed well in an engineering problem. The same approaches can be used in biomedical applications where the environment is better controlled.
The Weibull distribution is one of the most important lifetime distributions in applied statistic... more 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 using expert information. We then present a different approach to assess the parameters distribution. Objectives: The studies mentioned in this paper aimed to construct a distribution of the parameters of the Weibull reliability model and apply it in the domain of Maintenance Optimization. Method: The parameters of the Weibull reliability model are considered random variables and a distribution for the parameters is assessed using informed judgment in the form of reliability estimates from vendor information, engineering knowledge or experience in the field. Results: The results are the development of modern maintenance optimization models that can be embodied in decision support systems. Conclusion: While the information management part is important in the building of maintenance optimization decision systems, the accuracy of the mathematical and statistical algorithms determines the level of success of the maintenance solution.
Proceedings IEEE International Symposium on Intelligent Control 1988, 1989
The authors discuss the use of expert opinion in reliability assessment. They present an approach... more The authors discuss the use of expert opinion in reliability assessment. They present an approach for the analysis of life-length data that can be described by a Weibull distribution. They address the problem of predicting the number of defects due to fatigue in a railroad track. In both cases, a Bayesian approach is taken and procedures are developed and implemented on a personal computer
Optimal adaptive replacement in a renewal process
Applied Stochastic Models in Business and Industry, 2014
Uploads
Papers by Khalid Aboura