This thesis tackles Performability issues in Wireless sensors networks. Performability is a mission-specific measure of system effectiveness that seeks to combine the traditional reliability and performance measures of a system. Wireless Sensor networks consist of a huge number of small sensor nodes, which communicate wirelessly. These sensor nodes can be spread out in hard accessible areas by what new applications fields can be pointed out [13]. This thesis aims to provide wireless communication architecture for Petroleum installations, such as off shore platforms and on shore processing units, ...

The global Internet has experienced many years of sustained exponential growth doubling in size every nine months or faster [8]. Millions of users at tens of thousands of sites around the world depend on the global Internet as part of their daily work environment. This massive use of the Internet as well as the continuous interconnection of new groups arises many problems such as: packet loss, network congestion, insufficient bandwidth, increase in delay... In this thesis, we focus mainly on the problem of communication delay and bandwidth allocation. Our main goal is to find a way to minimize ...

In this thesis, automatic segmentation of liver veins from ultrasound slices is implemented and further rendered into 3D image to assist the medical doctor to more accurately apply any study intended on the liver. The main part of this study is the texture analysis since it is the hardest problem in common. As a start, 4 different techniques in texture analysis have been introduced, the Spatial Gray-level Dependence Matrices (SGLDM), The Fourier Power Spectrum (FPS), The Gray- Level Difference Statistics (GLD), and Law's Texture Energy Measure (TEM). Each of these methods have been discussed ...

Administration of access control was and still is a crucial, critical and complex aspect of Security Administration. Many models were developed and used to effect this administration such as Mandatory access Control (MAC), Discretionary Access Control (DAC) and Role Base access Control. the latter, RBAC which is a flexible and policy-independent access control, represents a natural structure of an organization where functions are grouped into roles and users are permitted to one or more of these roles. In large organizations with relatively large systems, with hundreds of roles and users and ...

The classic way for communication between database and applications is performed using ODBC (for standard applications) and DLL files (for distributed applications). The job of theses API's is to connect to database for sending and retrieving information. We introduce the WDBC pattern that is designed to do the same tasks but in addition, it guarantees the safety of data (by doing backup of database over the network) and can be integrated in an application that is created with different programming languages and running on different operating systems.

In this thesis, we demonstrate how developers can make use of the model driven architecture (MDA) techniques to make the software development process more reliable, robust and less costly. We will focus on discussing a set of transformation techniques that together, transform a PSM (Platform Specific Model) into a code model written in Visual Basic.NET and an ER (Entity Relationship) model developed using SQL (Structured query Language) and targeting the Microsoft SQL Server relational database management system. The source model is assumed to be represented using UML (Unified Modeling Language). ...

Mining association rules has been an important topic in data mining research in recent years from the standpoint of supporting human-centered discovery of knowledge. The present day model of mining association rules suffers from the following shortcomings: (i) lack of user exploration and control, (ii) lack of focus, (iii) huge number of rules technically unreadable. All data mining researchers, have given a high importance on developing fast algorithms for rules discovery, and have applied different types of constraints in different algorithms to prune item sets, that do not occur frequently ...

This thesis discusses the topic of learning in a complex environment. Both the historical basis of the field and a broad selection of the current works are summarized. Reinforcement learning is the problem faced by an agent that learns behavior through trial-and-error interactions with a dynamic environment. The work described here has a resemblance to work in psychology, but considerably in the details and in the use of the word "reinforcement". We describe the foundations of new field of reinforcement learning named artificial economy. We experiment with a prototype based on the artificial ...

The purpose of this thesis is to study distributed applications in the context of heterogeneous clients (Web browser, mobile) and business-to-business (B2B) integration. Two distributed architectures, leaders of the distributed applications market are presented and compared: Microsoft's .NET, and Sun's Java Enterprise Java Beans (J2EE). After this comparative study, we chose .NET to develop an e- commerce application (Jurasco Style electronic shop) in order to outline the major application architectural issues and solutions offered by .NET technology. Our study also shows how the .NET Jurasco ...

The aim of data mining as a scientific research is developing methods to analyze large amounts of data in order to discover interesting regularities or exceptions. Typical problems, which should be resolved during developing effective data mining algorithms, arise from the large sizes of both: The data sets used in the data mining process and the patterns results sets (for example in rules) which form discovered knowledge. Scientific researchers are oriented to find the most advantageous (i.e. most effective) solutions both during the data preparation stage and exploration and finally post- ...