定时

In this paper, joint estimation of the number of active users, active users and their timing in asynchronous CDMA systems are discussed.

摘要该文讨论了异步CDMA系统的激活用户数、激活用户及其定时的联合估计问题。

In this paper, we improve FEAS algorithm that exhibits high time complexity to decrease the running time. Then we propose a retiming algorithm by which we can reduce the number of period constraints.

本文针对目前重定时算法的时间复杂度较大的弱点，对FEAS算法进行了改进，提高了算法的运行速度。

Since sequential redundancies are difficult to identify, retiming is introduced in the work to convert the sequential redundancies into combinational redundancies which can be easily removed by some mature combinational optimization tools.

针对时序冗余难于识别的问题，这种方法引入重定时技术，将电路中的时序冗余转换为冗余的组合逻辑，然后利用已有的比较成熟的组合逻辑优化工具将其去除。

In retiming registers are added at some points in a circuit and removed from others in such a way that the functional behavior of the circuit as a whole is preserved. By retimng we can optimize the speed, area or power of the circuit.

重定时在保证功能不变的前提下，通过移动时序元件的位置和改变时序元件的个数来优化同步时序电路的速度、面积和功耗。

Beacouse circuitry net list which is synthesized by synthesizer may not achieve the demand of the designer, the sequence circuit which is synthesized must be optimized under require of speed. Retiming is one of the important techniques of optimizing sequence circuit.

但是由于综合器综合得到的电路网表不一定能达到设计者的设计要求，所以需针对给定的速度要求，对综合得到的时序电路进行速度优化，其中针对时序逻辑的重定时优化技术，便是一种重要的优化技术。

Compared with tranditional methods, it is not too optimistic or pessimistic, fit for the exact timing of high-speed circuit design. Anda retiming scheme based on the above method is also presented to optimize the timing behavior of sequential circuits.

同传统方法相比，本方法计算出的最小周期既能保证电路的正确计算，又不至于保守，而且能同时计算出组合逻辑部分的延迟；然后从时序电路的波形多项式出发，进一步给出了多周期敏化的最小时钟周期确定方法，适用于有苛刻定时要求的环境。

This article analyzes the problems,such as the time delay and error code characteristic of optic fiber channel,path switching mistake caused by maintenance staff and improper parameter setting on 2 M channel retiming,which will produce negative influence on protection system.

文章分析光纤通道时延、误码特性、人为造成的通道倒换方式选择错误、2 M通道重定时参数设置不当等问题，研究这些问题给保护系统带来的负面影响，提出了光纤保护对通道的要求及注意事项。

If the RCS-900 protection adopts the 2048kbit/s multiplex channel, slips may occur in the receiving code of the protective equipment while the retiming function of the channel is on and the communication clock of the protective equipment is set in the inner clock mode.

在RCS-900系列保护装置采用2048kbit/s复用通道的推广过程中，发现打开通道的输出再定时功能，并且将保护装置的通信时钟设置为内时钟方式时，保护装置接收信号会产生滑码。

If the RCS-900 protection adopts the 2 048 kbit/s multiplex channel, slips may occur in the receiving code of the protective equipment while the retiming function of the channel is on and the communication clock of the protective equipment is set in the inner clock mode.

文章摘要：在RCS-900系列保护装置采用2048kbit／s复用通道的推广过程中，发现打开通道的输出再定时功能，并且将保护装置的通信时钟设置为内时钟方式时，保护装置接收信号会产生滑码。

Synthesis tools may often apply sequential optimizations such as retiming to complex designs and hence destroy the correspondence between flip-flops in both the reference and implementation designs.

然而对一个复杂设计，通常在调用综合工具时会进行重定时等时序优化，这些优化容易破坏综合前后设计触发器间对应关系。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。