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This paper presents a simplified analysis of a generalized cycloconverter and suggests a new method for the estimation of the cycloconverter period as a function of the control mode. The paper presents generalized theoretical results supported by computer simulations and demonstrated by examples. [ABSTRACT FROM AUTHOR]

Both simulation and analytic models of computer systems can be very useful for predicting the performance of proposed new systems or proposed changes to existing systems. Unfortunately, many potential users of models are reluctant to use them because of the complexity of many such models and the difficulty of relating the model to the real system. This tutorial paper leads the reader through the development and use of an easily understood analytic model. This is then placed in context with a class of similar analytic models. In spite of the simplicity of these models they have proved useful and quite accurate in predicting performance (utilization, throughput, and response) using only the most basic system data as input. These parameters can either be estimates or measurements from a running system. The model equations and assumptions are defined, and a detailed case study is presented as an example of their use. [ABSTRACT FROM AUTHOR]

The paper considers the implementation of distributed discrete event simulation (DDES) using what has been commonly called the Misra approach, after one of the inventors of the approach. A major problem with DDES is that deadlock can occur. Therefore, DDES algorithms must either avoid deadlock in the first place, or detect the existence of deadlock when it does occur and eliminate the deadlock. Misra proposes the use of NULL messages as one way to circumvent the deadlock problem. However, the number of NULL messages can become quite large. Methods are presented for reducing the number of NULL messages through the prediction of channel times. A framework is presented on which the distributed discrete event simulation can be built for applications which can be decomposed into feedforward and feedback networks. [ABSTRACT FROM AUTHOR]

Conditions are proposed of the availability of the oscillation property in the sense of Yakubovich in a system with a nonlinear nominal portion enclosed by static nonlinear output feedback.A technique is worked out to calculate analytical estimates for the amplitude of oscillations in the system.The relation between estimates for the amplitude of oscillations and the index of excitability of the system with respect to the input is established.Examples are given of the computer modeling for systems of the 2nd and the 3rd order,including Van der Pol and Lorentz systems conforming the applicability of the suggested solutions. [ABSTRACT FROM AUTHOR]

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