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OPTIMIZED DESIGN OF HYDRAULIC CONTROL PATTERN OF synchronous system IN LARGE SCALE DIE-FORMING HYDRAULIC PRESS

Transactions of Nonferrous Metals Society of China 1996年第1期6卷 125-129,140页

作者： Tan Jianping Zhong Jue Yan Jian Department of Mechanical Engineering Central South University of Technology 410083

The hydraulic control mode of the synchronous system in Chinese-built 300 MN dieforming hydraulic press was analysed *** improve the deficiency of the existing system,a series investigations were put forward,such as the controlling of inclination angular-velocity,the pre-estimating of compensation,the synchronous cylinder's pressure signal protection,ratio pressure control and changing flow control etc,to increase the system's control accuracy and reliability greatly.

关键词： synchronous system hydraulic control optimization

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Conditions for Set Agreement with an Application to synchronous systems

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Journal of Computer Science & Technology 2009年第3期24卷 418-433页

作者： Francois Bonnet Michel Raynal IRISA University of Rennes35042 Rennes CedexFrance

The k-set agreement problem is a generalization of the consensus problem： considering a system made up of n processes where each process proposes a value, each non-faulty process has to decide a value such that a decided value is a proposed value, and no more than k different values are decided. While this problem cannot be solved in an asynchronous system prone to t process crashes when t≥ k, it can always be solved in a synchronous system; [t/k]＋1 is then a lower bound on the number of rounds （consecutive communication steps） for the non-faulty processes to decide. The condition-based approach has been introduced in the consensus context. Its aim was to both circumvent the consensus impossibility in asynchronous systems, and allow for more efficient consensus algorithms in synchronous systems. This paper addresses the condition-based approach in the context of the k-set agreement problem. It has two main contributions. The first is the definition of a framework that allows defining conditions suited to the l-set agreement problem and the second is a generic synchronous k-set agreement algorithm based on conditions.

关键词： agreement problem condition efficiency lower bound synchronous system

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