THE MODEL OF A NONHOMOGENEOUS LOCAL NETWORK WITH A COMBINED ACCESS PROTOCOL, TAKING INTO ACCOUNT COMMUNICATION CHANNEL RELIABILITY CHARACTERISTICS

2011 ◽  
Vol 70 (4) ◽  
pp. 345-352
Author(s):  
E. B. Gezalov
Keyword(s):  
Communication Channel ◽  
Local Network ◽  
Access Protocol ◽  
Reliability Characteristics

scholarly journals MODEL OF HETEROGENEOUS LOCAL COMMUNICATION NETWORK WITH SYNCHRONOUS TIME ACCESS PROTOCOL, CONSIDERING THE RELIABILITY OF ITS ELEMENTS

T-Comm ◽  
2021 ◽  
Vol 15 (3) ◽  
pp. 25-29
Author(s):  
Elchin B. Gezalov ◽  
Keyword(s):  
Communication Network ◽  
Discrete Time ◽  
Communication Channel ◽  
Local Network ◽  
Access Protocol ◽  
Local Communication ◽  
Video Information ◽  
Synchronous Time ◽  
Incoming Message ◽  
Message Flow

In the article the local communication network, heterogeneous on the intensity of the incoming message flow and the type of messages, with synchronous time access protocol is considered. All communication stations of the considered local network consist of three substations: speech substations, video information substations and data substations. Speech substations form the speech subnet, video information substations form the video information subnet, and data substations form the data subnet. Substations within the same subnet are homogeneous in their activity. A model of the considered local network in discrete time is being carried out, which allows assessing the effect of the failure processes and restoration of substations of network stations and the communication channel on its characteristics. Based on the developed model of the local network, the probability-time characteristics of the considered network are selected and determined.

scholarly journals Ultimately Bounded Filtering for Time-Delayed Nonlinear Stochastic Systems with Uniform Quantizations under Random Access Protocol

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4134
Author(s):  
Jiyue Guo ◽  
Zidong Wang ◽  
Lei Zou ◽  
Zhongyi Zhao
Keyword(s):  
Communication Channel ◽  
Stochastic Systems ◽  
Filter Design ◽  
Random Access ◽  
Nonlinear Filter ◽  
Nonlinear Stochastic Systems ◽  
Access Protocol ◽  
Design Algorithm ◽  
Uniform Quantization ◽  
Random Access Protocol

This paper investigates the ultimately bounded filtering problem for a kind of time-delay nonlinear stochastic systems with random access protocol (RAP) and uniform quantization effects (UQEs). In order to reduce the occurrence of data conflicts, the RAP is employed to regulate the information transmissions over the shared communication channel. The scheduling behavior of the RAP is characterized by a Markov chain with known transition probabilities. On the other hand, the measurement outputs are quantized by the uniform quantizer before being transmitted via the communication channel. The objective of this paper is to devise a nonlinear filter such that, in the simultaneous presence of RAP and UQEs, the filtering error dynamics is exponentially ultimately bounded in mean square (EUBMS). By resorting to the stochastic analysis technique and the Lyapunov stability theory, sufficient conditions are obtained under which the desired nonlinear filter exists, and then the filter design algorithm is presented. At last, two simulation examples are given to validate the proposed filtering strategy.

Ultimate resolution and information in electron microscopy

1991 ◽  
Vol 49 ◽  
pp. 496-497
Author(s):  
D. Van Dyck
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Transfer Function ◽  
Information Transfer ◽  
Communication Channel ◽  
Structural Information ◽  
Information Rate ◽  
Noise Power ◽  
Signal Power ◽  
Imaging Device

An (electron) microscope can be considered as a communication channel that transfers structural information between an object and an observer. In electron microscopy this information is carried by electrons. According to the theory of Shannon the maximal information rate (or capacity) of a communication channel is given by C = B log2 (1 + S/N) bits/sec., where B is the band width, and S and N the average signal power, respectively noise power at the output. We will now apply to study the information transfer in an electron microscope. For simplicity we will assume the object and the image to be onedimensional (the results can straightforwardly be generalized). An imaging device can be characterized by its transfer function, which describes the magnitude with which a spatial frequency g is transferred through the device, n is the noise. Usually, the resolution of the instrument ᑭ is defined from the cut-off 1/ᑭ beyond which no spadal information is transferred.

Creating a standard method of controlling digital microscopes: the microscope access protocol (map)

1995 ◽  
Vol 53 ◽  
pp. 16-17
Author(s):  
T. A. Dodson ◽  
E. Völkl ◽  
L. F. Allard ◽  
T. A. Nolan
Keyword(s):  
Data Storage ◽  
Storage Systems ◽  
Digital Systems ◽  
Data Networks ◽  
Digital Microscopy ◽  
Command Language ◽  
Access Protocol ◽  
Analog To Digital ◽  
Basic Physics ◽  
Scanning Electron

The process of moving to a fully digital microscopy laboratory requires changes in instrumentation, computing hardware, computing software, data storage systems, and data networks, as well as in the operating procedures of each facility. Moving from analog to digital systems in the microscopy laboratory is similar to the instrumentation projects being undertaken in many scientific labs. A central problem of any of these projects is to create the best combination of hardware and software to effectively control the parameters of data collection and then to actually acquire data from the instrument. This problem is particularly acute for the microscopist who wishes to "digitize" the operation of a transmission or scanning electron microscope. Although the basic physics of each type of instrument and the type of data (images & spectra) generated by each are very similar, each manufacturer approaches automation differently. The communications interfaces vary as well as the command language used to control the instrument.

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