Journal of Kufa for Mathematics and Computer

Several studies have been performed to investigate the benefits of parallel programming
models, and compared the models with same language family. The parallel technique is applicable only
when the programmer has a single computer with multiple processors to perform various tasks
individually or the programmer number of different computers connected by a single network. Parallel
programming model in computing is an idea of parallel computer architecture. This research introduced
the concept of parallel programming models and languages. The present research mainly focused on the
different parallel programming models proposed by previous researchers using distinct programming
languages. Through analyzing the strengths and weaknesses of various programming models used for
parallel computing, a new model is developed. Along with this, the concept of OOP (Object-oriented
programming) in the context of parallel computing is also discussed. This research proposed a model
named as Asynchronous Dynamic load Balancing (ADLB). ADLB model used MPI as avehicle for library
implementation rather as an end-user programming system.

In this work, we submite and study a newlclass of meromorphiccmultivalent functions defined by
fractional differ-integral operator . We gain some geometric properties , such as, coefficient inequality, growth and
distortion bounds, convolution properties, integral representation, radii of starlikeness and convexity, extreme points,
weighted mean and arithmetic mean for functions belonging to the class .

this paper dedicated to the construction of solution of a three time scale periodic singular perturbed nonlinear quadratic optimal control problem by using the direct method. The algorithm of the method is the direct
substitution of the postulated asymptotic expansion of the solution of the problem and then by the conditions of the
problem we constructed of a series of problem and find terms of the asymptotic. We find the solution by using the
Hamilton's function and maximum principle.

Data encrypting and steganography techniques each have its own merits and weaknesses.
Crackers and hackers developed many software applications that can attack the weakness of these techniques
and thus can reach to the meaning of the private information and its existence.
In this paper, a simple technique is proposed to make use of encrypting and steganography merits
simultaneously, and thus makes any attempt for breaking both techniques at the same time harder than
applying each of them alone. The proposal uses English, Arabic, or mixed writing plain text. Encrypting the
text by AES-encrypting algorithm with an encryption key of 128 bit long and then hiding the encrypted text
with only one part of the encrypting key (sender key only), in another English/Arabic (cover), plain text. The
text hiding technique is done according to the nonprintable characters of the Unicode character set method.
The proposed technique is coded into a form of Matlab program. Experimenting with this paper technique
shows how difficult to break the system and thus can applying it in emailing private documents between users
connected to a virtual network on an insecure public channel.