Topological analysis and synthesis of communication networks

1964 ◽  
Vol 7 (3) ◽  
pp. 238-240
Author(s):  
I.M. Jacobs
Author(s):  
Hong-Sen Yan ◽  
Chin-Hsing Kuo

A mechanism that encounters a certain changes in its topological structure during operation is called a mechanism with variable topologies (MVT). This paper is developed for the structural and motion state representations and identifications of MVTs. For representing the topological structures of MVTs, a set of methods including graph and matrix representations is proposed. For representing the motion state characteristics of MVTs, the idea of finite-state machines is employed via the state tables and state graphs. And, two new concepts, the topological homomorphism and motion homomorphism, are proposed for the identifications of structural and motion state characteristics of MVTs. The results of this work provide a logical foundation for the topological analysis and synthesis of mechanisms with variable topologies.


Author(s):  
Ting-Li Yang ◽  
Dong-Jin Sun

This paper presents a new DOF formula for mechanism Its main feature is that the calculation of mobility has a single value for a given mechanism without the set of constraint equations, each of parameters in the formula can be correctly determined by simple symbol operation. The formula shows the map relationship between DOF and topological structure of a mechanism. It is embodied in the following aspects: (1) Dimension type: so that topological structure of a mechanism can be represented by symbols. (2) Orientation and location characteristic matrix: so that rank of a mechanism can be calculated by symbolic operation. (3) Orientation and location characteristic equation of serial mechanism and its symbolic operation. (4) Orientation and location characteristic equation of parallel mechanism and its symbolic operation. (5) The DOF calculation based on orientation and location characteristic equations of serial and parallel mechanisms. The DOF formula presented in this paper has already been used for topological analysis and synthesis of parallel mechanisms and its advantages has been proven.


Author(s):  
O. Nalapko ◽  
R. Pikul ◽  
P. Zhuk ◽  
A. Shyshatskyi

The experience of carrying out the Operation of the United Nations (antiterrorist operation) on the territory of Donetsk and Luhansk oblasts shows that the existing procedure for managing the channel and network resources of military radiocommunication systems does not meet the modern requirements, which are put forward for them. The choice of a route in special purpose networks with the ability to self-organize on the basis of specific parameters is the main problem for managing the channel and network resources of special-purpose networks, as well as the difficult task of climbing the network. In this article, the authors analyzed the existing mathematical apparatus for controlling channel and network resources of military radiocommunication systems. During the research, the authors of the article used the classical methods of scientific knowledge, namely, the methods of analysis and synthesis, the basic provisions of the theory of communication, methods of modeling of communication networks, the theory of artificial intelligence, and others. It is established that the existing methods of controlling the channel and network resources of military radiocommunication systems take into account only certain factors influencing the quality of the use of channel and network resources of military radiocommunication systems. Therefore, it is the most expedient to choose a route for information transmission on many parameters based on fuzzy logic and a modified method of the ant colony system, through which searches and maintenance of the path of the packet passing between two points between the node from which the IP packet and the destination node are sent. To find a route, the following parameters must be considered: the energy component, the data rate, the time delay of the IP packet from the node that sends the packet to the destination node and the reliability of the delivery of the IP packet. These parameters should be taken into account while creating mathematical models, methods and techniques for managing channel and network resources of military radio communication systems.


Author(s):  
Zhu Han ◽  
Dusit Niyato ◽  
Walid Saad ◽  
Tamer Basar ◽  
Are Hjorungnes

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