International Journal of Engineering and Advanced Technology (IJEAT) ISSN: 2249 – 8958, Volume-4 Issue-1, October 2014 181 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Pvt. Ltd. Abstract— Visually impaired people need improvement of their communicability to contact with other people. Different solutions of the improvement of the man-computer interaction could help the visually impaired people use their abilities to full extent. The Human-Computer Interaction (HCI) is a basic term described as the way a user communicates or interacts with computers. To guarantee the ability to acquire information, the computer interface should include software and hardware elements to facilitate this perception. The development of computer technology provides possibilities to combine multiple performing devices into an integrated system aimed to give or facilitate certain services. In somewhat narrower context, the present work is related to the problems in the design of complex interface and performing devices for the people with reduced sight or totally blind ones. This is a prerequisite for the realization not only of interface devices but also of systems capable of partial or full processing of information. In the presented study is shown a model of a single system. The study is the result of research project funded by Bulgarian National Science Fund – NSF Grant No D-ID-02/14 and Grant NHT-333/14. Keywords: Automation, Blind people, Computer Interfaces, IT Architecture, Modeling, User support, I. INTRODUCTION Visually impaired people need improvement of their communicability to contact with other people. Different solutions of the improvement of the man-computer interaction could help the visually impaired people use their abilities to full extent. The massive deployment of graphical environments helps the users by creating intuitive graphical interfaces. An image of desktop is simulated similar to the usual working environment. After Apple, Microsoft also created a desktop image for the graphical interface of Windows. UNIX operation system also tends to improve its graphical interface. These graphical interfaces allowing for intuitive interaction with the users, however, are a great challenge for the visually impaired people. The fast expansion of Internet and the use of graphical browsers creates heavy difficulties for the visually impaired. Based on the fact that navigation and individual programs are presented as pictograms, one easily can conclude that blind people need new concept for their interaction with computers. During the last decade, the natural evolution of user interfaces is oriented to a model based exclusively in Manuscript Received on October 2014. Stanislav Simeonov, Computer Systems and Technologies, University “Prof. Dr. Asen Zlatarov”, Burgas, Bulgaria. Neli Simeonova, Electrical engineering and electronics, University “Prof. Dr. Asen Zlatarov”, Burgas, Bulgaria. graphical presentation. This process limited the use of computers and access to new technologies by visually impaired people. The development of special applications for them requires new technologies, instrumentation and communication media. A blind user cannot manipulate alone the CMOS setup utility, install an OS or use Safe mode in MS Windows. It is hard for him to navigate within the increasing number of interactive network applications. The Human-Computer Interaction (HCI) is a basic term described as the way a user communicates or interacts with computers. Generally, these are menus, direct manipulation of files and natural languages. The introduction of graphical interfaces started back in 1980-ies with the so called pseudo-graphic representations and auxiliary elements. After 1990, the graphical interfaces were massively introduced not only within certain programs but also as an aid to effective management of OS resources. These interfaces are characterized by a principle based on direct manipulation of objects in the environment. The interfaces involve interpretation of direct user actions (like select, pull, etc.) on the visually representations of the interface objects (e.g. icons) with specific input devices. This definition of HCI style can be generalized as WIMP (Windows, Icons, Menus, Pointers). This term is used in accordance with the Graphical User Interface (GUI). Such interfaces implement graphical presentation of elements like windows, buttons and icons. The individual graphical objects are manipulated by specific input devices allowing intuitive actions of the user. The user executes certain actions on these objects using the input devices. The WIMP style is easy to learn and use. Most applications implement similar ways of visualizing and similar style of work, thus making user life easier. Obviously, many of the WIMP style achievements are useless for the visually impaired people. After 1990, with the migration from text-oriented to graphical interfaces, the jobs of many people with reduced sight were put at risk. The work of visually impaired with computers has particular characteristics. To guarantee the ability to acquire information, the computer interface should include software and hardware elements to facilitate this perception. Such components are – link to Braille terminals, specialized matrices, voice interfaces in both directions and tactile systems of perception. As a result of the technological developments of individual components, a concentration of multifinctionality is achieved within certain interface. The development of computer technology provides possibilities to combine multiple performing devices into an integrated system aimed to give or facilitate certain services. In somewhat narrower context, the present work is related to the problems in the design of complex interface and performing Modeling an Aggregate of Interfaces in a Discrete Space and Time Stanislav Simeonov, Neli Simeonova