Earticle

A good watermarking technique embeds information into a carrier image with virtually imperceptible modification of the image. The present paper found a novel fact that by inserting the watermark using Least Significant Bit (LSB), the grey value of the image pixel either remains same or increases or decreases to one. The present paper is focused on this issue and found that such ambiguity of grey level values by LSB method comes between successive even and odd grey level values only. The proposed method inserts hidden message on m x m windows, based on their grey level values and coordinate positions. The present approach allows high robustness, embedding capacity and enhanced security. A detailed algorithm is furnished along with the results of its application on some sample images.

This article is devoted to discussion of development of the electronic business. The features of the electronic business are described. Some advantages of the electronic business in enterprises are shown. The modern business is characterized by constant growing of global competition and increasing level requirements of customers. The role of the electronic business in increasing of competitiveness is considered. For preparing and organization successful in competitive fight electronic business recommendations are suggested. This paper gives an overview of current on – line payment systems of UzNet in Uzbekistan, determines which are they and how do they work. Also these systems compared and analyzed from functionality, security and cost point of view. Also the question of necessity of using the digital signature in e-Procurement systems is considered in this paper. Such technology will allow to faultless identification of the person who have signed document, and an invariance of the signed document.

In given article questions on directions of the theory and practice of computer modeling and the organization of computing experiment are considered at carrying out of pedagogical researches. Its condition for today is analyzed and the mathematical model of processes of testing is offered. In this article objects of creation methods and models of teaching material setting-up in depend on states of trainee in intellectual education systems are considered. The computer system of Uzbek Spellchecking depends on many scientific researches which were made for other agglutinative languages. Effective algorithms that can solve this problem using small amount of resources and without a waste of time are discussed in this paper. Also here the program’s graphic user interface and its full functionality have been described. In the third part of the paper the results of analysis of Russian Federation and Kyrgyz Republic educational standards in Information Technology, Computer Sciences, Informatics, Applied Mathematics and other are considered in this paper. Required changes are bringing out that must be made for development new educational standard corresponding Bologna Process. Important specifics of educational standards of European Countries and United States are showing. New educational standard on field “Informatics and Computer Engineering” are suggested for bachelor level of Kyrgyz Republic. In the suggested standards four blocks of previous standards are saved to provide continuity with standards former generation.

In this paper, we consider the design of stable linear switched systems for polytopic uncertainties via their closed loop linear quadratic state feedback regulator. The closed loop switched systems can stabilize unstable open loop systems or stable open loop systems but in which there is no solution for a common Lyapunov matrix. For continuous time switched linear systems, we show that if there exists solution in an associated Riccati equation for the closed loop systems sharing one common Lyapunov matrix, the switched linear systems are stable. For the discrete time switched systems, we derive an LMI to calculate a common Lyapunov matrix and solution for the stable closed loop feedback systems. These closed loop linear quadratic state feedback regulators guarantee the global asymptotical stability for any switched linear systems with any switching signal sequence.