MODELING IN DEVELOPING DISTRIBUTED AUTOMATED SYSTEMS AND INFORMATION NETWORKS
Considering ASOIU from the point of view of information processing technology and decision making, it is possible to distinguish a functional control scheme consisting of providing subsystems that are in interrelation with each other and with the external environment. When designing ASOU at different levels, proceeding from the generality of the tasks to be solved, it is customary to allocate information, mathematical, software, technical and organizational support [2, 25, 34, 35, 52].
The simulation object.
Technical support is one of the main components of AOSIS, the material and technical base with which economic and mathematical management methods are implemented. The complex of technical means includes various means of computer technology, data collection and transmission, which ensure timely and qualitative processing of control information, and the territorial remoteness of control objects in the ASOU requires the use of information transmission tools whose main task is the exchange of information between the place of its origin and information- the computing center with the necessary speed and reliability.
The most promising direction in the field of creation
Technical support of ASOIU is the construction of information and computer networks, digital integrated services networks, which allow the most efficient use of information processing and storage resources [35, 38, 51, 54]. The structural diagram of such a network is shown in Fig. 10.2, where the levels of the backbone network, which realizes the exchange of information between the centers of collective use, and the terminal (subscriber) network, are provided -
Fig. 10.2. Structural diagram of the information network
Fig. 10.3. Block diagram of interaction between terminal and core network
The exchange of information between users and computers.
The main structural elements of the network are: nodes (centers) of stream switching that perform all the basic operations for network management, including switching and routing of message flows (packets); Concentrators providing the interface of the input low-speed communication channels with the output high-speed channel; terminals that perform the functions of organizing the user's access to network resources and functions for local processing of information; communication channels that realize the exchange of information between network nodes (switching nodes, hubs, terminals) with the required quality.
Let's consider in more detail the work of a fragment of such information-computer network on the background of interaction between its terminal and its base parts (Figure 10.3). Information that requires processing comes from user terminals in the form of messages with a length of q bits with an intensity of X messages/s. The subscriber computer, connected to the switching node, with the capacity of A bit/s, processes the information coming from the concentrators. Multiplexed channels of the computer are serviced by k terminals each, transmitting data to the computer at a speed V bits/s. If there is a lack of processing power for processing user information, the subscriber computer through the switching nodes and the backbone with the capacity of C bit/s is connected via the switching center to the computer of the upper level of the network (main computer), which have a total capacity of I bits/s in the presence of n multiplex channels. It is assumed that the switching processes are performed instantaneously. When designing the ASIC, it is necessary to estimate the average processing time of information T 0 and the probability of refusal to perform the work P 01 only from a subscriber computer, i.e., in an autonomous mode, and in case of connection to a computer of a collective network.
Fig. 10.4. The representation of a network fragment in the form of schemes
Formalization of the process of modeling object functioning. The process of functioning of this fragment of the information-computing network can be represented in the form of a 0 ~ scheme, having two parallel service channels, as well as communication controlling the blocking. The structure of such a b-scheme, formalizing the process of operation of the fragment of the described network, is shown in Fig. 10.4. Here I is the source; To 1 and to 2 - service channels. As the source output stream (I), the total flow of messages from the terminals is considered, i.e. the flow at the output of the concentrator. The output flow of the Q-cxeme will be the serviced messages for the work of the channels A and K 2 and the lost messages when the channel is disconnected (blocked) K 2 . In this formulation, the solution of this problem by the analytical method (in explicit form) with the use of queuing theory is not possible because of the stochastic nature of the locking mechanism, so we use the simulation method to estimate the characteristics of interest.
In this case, you can write: endogenous variables: T 0 - the average time for servicing messages; P at is the probability of denial of service; exogenous variables: ktschk - the intensity of the incoming message flow; A - productivity of the subscriber computer; I - the total performance of the main computers of the network; В - bandwidth of selector channels of a computer; C - the capacity of the main communication channel; equations of the model: a)
with a blocked channel
Fig. 10.5. The enlarged scheme of modeling algorithm of a fragment of a network
b) for the operation of the channels K, and K 2
An enlarged diagram of the modeling algorithm of the process of functioning of a fragment of an information-computational network is presented in Fig. 10.5.
Examples of simulation results in the form of the dependence of/on =/(Am |) are shown in Fig. 10.6.
Fig. 10.6. The result of the network fragment simulation
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