Journal of University of Babylon

Reliability is to make the product more reliable. The reliable systems or devices are those with minimum possible number of faults or defects during their designed operation time. Reliability helps in maximizing the system accurate life time. Improving the system design process will helps in exceeding many difficulties during the practical operation life. The modeling process is often used to analyze, control and optimize the system or any of its components. One of the suitable and possible models to be built is a mathematical model which used to represent, model and analyze the system operation. A Mathematical model is the main fundamental tool that can be used to understand, analyze, measure and evaluate complex systems performance. It describes each system by a set of variables, a set of inequalities and a set of equations to establish relationships among these variables. In this paper a stochastic mathematical model was built using stochastic transitions to represent the process of modeling, analysis to estimate the system reliability. This model can be used to indicate the critical weak points in the suggested system and the available alternatives to achieve certain developing and improvement corrections.

The present work is a theoretical and experimental study of a biconvex lens as an optical processor .The MATLAB software concerning the Fourier optics is used as the basic numerical tool for these work. In addition to providing functions for calculating Fraunhofer diffraction . The FFT command enables the calculation of the diffraction pattern of an arbitrary aperture . Relatively simple MATLAB ® scripts are constructed to calculate the diffraction patterns of arbitrary graphics such as geometry shapes, pictures of faces, letters .This paper also describes a few demonstrations that can be used to reinforce what is covered on the work . The demonstrations are based on a simple (2F set-up ) system. Diffractive imaging relies on many other technological innovations , including : a CCD camera ,digital camera HD (12 Mega Pixels) with a lens (f=7.23mm). The experimental results agree with the theoretical calculations .

Assessment is the important process for testing the ability of the institution program to meet the required criterions to get the accreditation. In this work we deals with ABET quality assurance agency dedicated with applied science, computing, engineering and technology education and we concerned with computer science program. A software agent, which provide difference facilities developed to achieve the assessment function. The developed agent(Assessment Agent) perceive the current institution program status from the system environment, then perform sequence control instructions included two cycles of verifications to generate the Self Assessment Report(SAR) and advices for getting accreditation.

This paper involves the manipulation of the flag field in the IP packet header for implication of a covert channel. The hidden data which are carried by the flag field are recognized at the receiver site by using a certain reference sign.
This work also attempts to overcome some difficulties that face the user of IP covert channels; these are mainly concentrated on the limitation of the message length and the recognizability of the hidden data.
The implementation has finally been done with the creation of DLL that is in charge of the lower level aspects, such as the extraction at Data Link level of the Ethernet packets like extracting the IP packets, manipulating the identification field, recalculating the checksum and resending them.