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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]

Abstract: Churn is a basic and inherent problem in P2P networks. A lot of relevant studies have been carried out, but all lack versatility. In this paper, a general solution is proposed which makes a peer-to-peer (P2P) network need not pay much attention to churn problem by introducing a logic layer named Dechurn, and most of churn could be eliminated in the Dechurn layer. For utilizing the complementary nature of node joining and leaving, a network scheme, named Constellation, for handling churn is designed on the Dechurn layer through which the resources cached in a node for its spouse node who has left network would be succeeded by a node in latent period. The simulation results indicate that the proposed solution is effective and efficient in handling churn and easy to put into practice. [Copyright &y& Elsevier]

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]

The September 01, 1996 issue of the journal "ACM Computing Surveys" contains four articles that span object-oriented programming, partial evaluation, error detection and hardware performance. Writer Antero Taivalasaari's comprehensive paper examines many forms and uses of inheritance in a readable way. He distinguishes among classification, generalization, aggregation and grouping between sub-classing and sub-typing and between specification and implementation inheritance. Writer Neil Jones identifies partial evaluation with automatic program specialization with automatic program specialization and shows that some forms of specialization yield program speedup while others do not. Writer Joseph Gallian focuses on the use of check digits for error detection. A nice feature of that article is emphasis on applications like supermarket product cods and credit card, library, blood bank and money bank applications. Writers Peter Soderquist and Miriam Leeser examines area and performance tradeoffs for floating-point divide and square root implementations. This study combines the presentation of algorithms and hardware/software tradeoffs with performance simulation results.