A parallel algorithm solving a tridiagonal Toeplitz linear system

A new tridiagonal Toeplitz linear system (TTLS) solver is proposed. The solver first decomposes an n-dimensional strictly diagonally dominant TTLS equation into a number of m-dimensional subsystems employing a modified Gaussian elimination method. An analytic solution of a continued fraction is obtained to derive the solver. The solver based on the modified Gaussian elimination method fully exploits parallelism. Computation and communication complexities of the proposed algorithm are all shown to be O(n/m).     

实时全息干涉计量中时间序列条纹位相的测量方法

针对实时全息干涉计量的特点 ,结合相移位相测量技术 ,提出一种利用物体本身变化产生的位相变化来实现实时全息干涉计量中时间序列条纹位相的测量方法 ,通过分析得到不同时刻位相变化及整个变化过程中位相累计变化的计算公式     

Earliest Deadline First Scheduling with Active Buffer Management for Real-Time Traffic in the Internet

We studied the problem of QoS guarantee for differentiated services. A two-level hierarchical scheduling framework was deployed to separate QoS metrics. Due to its desirable property of minimizing the maximum packet lateness, the Earliest Deadline First (EDF) scheduling was adopted to provide the in-class scheduling for the time-sensitive traffic. We employed an EDF scheduler combined with an active buffer management scheme (CHOKe) to improve the fairness of resource allocation and to maintain a good delay performance for real-time applications. Simulation results showed that the proposed scheme can achieve a better delay performance and make a more fair bandwidth allocation between the real-time TCP and UDP connections than the First Come First Served (FCFS) scheduling with the drop-tail buffer management which is commonly deployed in traditional IP routers.     

双基地雷达实时测距与距离分辨

本文叙述了基线长为10km,以接收点为坐标原点的双基地雷达实时测距系统。最大测量距离为25.5km。方位角观察范围为0°至255°,仰角观察范围为0°至40°。测距系统能提供的角度分辨力为1°;能提供显示器的量化距离小于100m。采用十六位微机对目标离接收点的真实斜距进行了精确计算。在整个测距范围内,最大计算绝对误差不超过51m。以 DMA 实现快速数据读出,形成显示器的时基线。在同一波束位置上,本测距系统能处理10~6sec~(-1)数据率的目标,并给出它们的真实斜距。本测距系统计及了目标高度对斜距的影响。整个系统具有数模结合的特点,并保留了目标的幅度信息,为雷达操纵手识别目标提供方便。本文还讨论了双基地雷达的距离分辨力。     

基于粒子系统的流场实时模拟

数学模型计算结果的显示大多以后处理的形式出现，存在显示时间滞后、存储数据量大、无交互性等方面的不足．应用计算机图形学中的粒子系统来模拟流场，通过分析粒子的存储结构和出生、发展、消亡的生命历程对流场模拟的实时性和模拟效果的影响，从显示方面提高了系统运行的实时性与真实性；采用调整显示时间的方式实现计算和显示时间同步及数据的实时传输，开发了集实时计算和显示于一体的流场模拟系统。     

实时数据库系统中数据压缩技术的研究

实时数据库系统是对时间要求非常高的系统,而企业所集成的数据采集点数通常有几千到十几万个,数据采集时间间隔达秒级,数据量很大,因而数据压缩技术在实时数据库系统中尤为重要。采用基于变化率的矢量压缩和选择适当的动态压缩偏差参数使数据压缩率明显提高,有力地保证了实时数据库系统的时间特性,给企业的生产和管理带来很大的变化,提高了企业的生产率和经济效益。     

电炉流程的物流管制之三——上钢三厂大电炉分厂生产调度的实时系统仿真模型

在分析上钢三厂大电炉分厂的生产系统基础上，建立了电炉－－连铸车间生产调度的实时仿真模型，并对模型运行结果进行了说明，进而提出物流管制的目标和方法。     

A Supervisory Control Method for Ensuring the Conformance of Real-Time Discrete Event Systems

In this article, we study the problem of controlling a plant described as a real-time discrete event system. The aimed objective is to ensure a conformance relation denoted tioco between the plant and the formal specification of the system, by means of a supervisor. We adopt a two-step approach. In Step 1, we express the problem into a non-real-time form, by using a transformation of timed automata (TA) into particular finite state automata called Set-Exp-Automata (SEA). The latter use two additional types of events, Set and Exp. And in Step 2, we propose a non-real-time control method suitable for SEA. We also propose a control architecture.     

Twin-bus-controller protocol for fibre optic networks

A new Data Link Layer protocol, named the Twin-Bus-Controller (TBC) protocol, is proposed for a fibre optic network with unidirectional bus topology. The TBC protocol operates on a contention-based, time-division multiplexing scheme, and is managed by two centralized bus controllers. These controllers, which also function as network managers cooperate with each other to control and coordinate the activities on the twin bus. The IBC protocol has the capability to perform at a very high network utilization, and uses simple hardware at all stations except the two bus controllers. This arrangement provides a relatively inexpensive means to accommodate a large number of stations. Heterogeneous data consisting of real-time sensor and control signals, voice and video data, and non-real-time data such as those due to accounting and administration, can be simultaneously handled by the TBC protocol. The TBC protocol maintains global queues for all different types of data, and each class of data has a bounded delay. Furthermore, any new type of data can be added easily to the network without shutting it down or affecting those stations that are unrelated to the new data. A finite-state-machine model has been used to describe the TBC protocol. Performance of the TBC protocol has been evaluated by statistical analysis as well as via simulation for multiple classes of data traffic. Performance of the TBC protocol has been compared with that of Buzznet and Fasnet. The TBC protocol can be directly applied to diverse computer communication systems, e.g. office, manufacturing, and banking environments.     

基于差分数字化递推关系模型的二阶系统动态过程实时仿真

针对二阶系统在不同输入条件下的输出响应求解问题,以RLC振荡电路为研究对象,分析和建立了二阶系统输入输出关系微分方程数学模型,采用连续差分化方法,得到系统时域数字化输入输出递推关系模型,基于组态王工控软件编制了二阶系统动态过程实时仿真程序。通过仿真操作界面,在不中断仿真过程的情况下,可实时对输入信号或系统结构参数进行修改,系统响应过程数据及曲线能够连续实时输出和显示,仿真数据对实际生产设备动态特性研究以及控制器参数的调整具有重要参考意义。