基于发电机励磁系统的数据实时存储方案设计

研究在发电机励磁系统中设计实时数据记录及参数显示模块,将总线传递的数据进行处理,并实时存储的一种设计方案。系统采用铁电存储器、磁电阻随机存储器扩展了存储容量,使故障录波得以实现;应用RTC和PIT,完成了毫秒级的计时,完善了录波功能。     

Robust chaotic key stream generator for real-time images encryption

In this paper, we propose a robust and compact design architecture of hardware chaotic key generator for real-time images encryption. The new proposed approach combines the perturbation technique with a non-linear switching between multiple three-dimensional continuous chaotic systems. The originality of this new scheme is that it allows a low-cost image encryption for embedded systems while still providing a good trade-off between performance and hardware resources. This pipelined architecture is particularly attractive since it provides a high security. Numerical simulations and real-time experimental results using Xilinx FPGA Virtex technology have demonstrated the feasibility and the efficiency of our secure solution and can be applied to many secure real-time embedded applications in System on Chip (SoC). Thorough experimental tests are carried out with detailed analysis, demonstrating the high security and fast encryption speed of the new scheme while still able to resist statistical and key analysis attacks.     

A real-time optimal energy-saving walking pattern generator based on gradient descent method and linear quadratic control

Many recent approaches have successfully generated a stable walking pattern for biped robots, but discussions about its optimization are relatively few. In this paper, a Center of Gravity (COG) trajectory optimization method is proposed to minimize the cost function of joint torque, joint limit, and joint speed limit. The linear quadratic control-based inverted pendulum controller optimizes the COG trajectories in sagittal and lateral directions with the COG height trajectory. The COG height trajectory is optimized by finding the derivative of the cost function with respect to the COG height offline. Then the proposed walking pattern generator builds the COG height trajectory database of different walking steps for online connection of a walking pattern. The walking pattern generator is verified by experiments and simulations of different step cycles with our humanoid robot, NINO, and it can clearly reduce the required joint torque of the robot while walking. In addition, compared with the fixed COG height trajectory, the energy consumption is reduced by 14% from the experimental results. Thus, the method succeeds in generating a more energy-saving walking pattern.     

A real-time sequence control system for the level production of the automobile assembly line

In the automobile industry, mixed-model assembly lines are used to produce many different vehicles without carrying large inventory. For achieving high productivity, it is required to keep a constant rate of usage of parts used by the assembly line. We have developed a new dynamic sequencing method for level production of assembly line and built up an automated sequence-control system which had been operated manually. In this paper, we present i) the nature of sequence control problems, ii) a dynamic sequence control algorithm, and iii) the experience of automating a buffer control system.     

计算Fibonacci数的新算法

提供计算Fibonacci数的新算法并给出相应的计算式。同时运用数学归纳法和严格的推理证明了其正确性。当n较大时,仅需计算约N/4的Fibonacci数即可推出第n个Fibonacci数,有效地加快n较大时相应的Fibonacci数的计算。     

Investigating the design parameters on spiral micro-channel by using Fibonacci sequence and Taguchi method

Microsystem Technologies - The development of compact electronic components and electric systems with higher power dissipation requires smaller and faster processing cooling devices to enhance heat...     

Design of a real-time knowledge-based controller with applications in hydraulic turbine generator systems

Issues in the design and implementation of a real-time Knowledge-Based Controller (KBC) have been investigated. The design objective of such a controller is to maintain overall system stability and performance not only during normal, but also contingency, conditions. A general structure for such controllers is proposed. It consists of four major components: a knowledge base, a real-time inference engine, information processing algorithms, and a distributed controller. The functions of each individual component, as well as the relationship among them, are considered. The proposed design methodology is applied to synthesize a real-time knowledge-based controller for a hydraulic turbine governor.     

基于混沌反控制的Tent映射伪随机序列发生器设计

应用混沌反控制思想有意识地去产生混沌,进而应用混沌系统的伪随机特性进行伪随机序列发生器设计。针对Tent映射在有限精度实现时产生伪随机序列所存在的周期过短问题,应用混沌反控制,对Tent映射加入控制输入,从而解决了输出伪随机序列周期过短的问题,并通过阈值的在线调节输出0-1伪随机序列。证明了受控Tent映射是Lyapunov指数意义下混沌的,分析了Tent映射混沌反控制所产生的伪随机序列的安全性和计算效率,理论分析和仿真结果都证明了这种设计伪随机序列发生器算法的合理性。     

计算Fibonacci数的对分迭代算法

Fibonacci数有很多应用,它的求值有几种不同的算法。对原有算法的时间复杂性在理论分析的基础上进行了实验的分析,实验结果表明采用逐项递归算法、对分递归算法、直接求值算法和迭代算法的程序,其运行速度依次递升。论文还提出了一种对分迭代算法,它比原有最快的迭代算法约快20%～60%。     

Fibonacci: A programming language for object databases

Fibonacci is an object-oriented database programming language characterized by static and strong typing, and by new mechanisms for modeling data-bases in terms of objects with roles, classes, and associations. A brief introduction to the language is provided to present those features, which are particularly suited to modeling complex databases. Examples of the use of Fibonacci are given with reference to the prototype implementation of the language.     

New construction of perfect sequence set and low correlation zone sequence set

For a given binary ideal autocorrelation sequence, we construct a perfect sequence set by changing a few bits of the sequence. The set has a large size with respect to the period of its sequences. Based on the constructed perfect sequence set, a new class of low correlation zone sequence sets whose low correlation zone length can be chosen flexibly is obtained. Moreover, the new constructed low correlation zone sequence sets can attain Tang-Fan-Matsufuji＇s bound with suitably chosen parameters.     

基于SystemView的m序列发生器模型电路设计实现

分析了数字通信中伪随机码的数学及物理模型。以4位序列为例,利用SystemView仿真软件设计实现了伪随机码序列生成器的电路模型,并搭建仿真模型进行验证。仿真表明该设计具有合理性及正确性。     

基于TMS320VC5410的可编程m序列发生器的设计

基于TMS320VC5410微处理器开发平台,对直扩序列保密通信系统进行了研究.给出可编程m序列的C代码及其在数字信号仿真/实验系统DES320PP-U上的相关链接配置文件,实现周期在27-1、29-1、210-1和211-1内可编程变化的m伪随机序列;经调试与仿真,结果表明m伪随机序列信号的周期、初相位可编程随机变化是满意的,采用该方法可以实现可编程m序列随机发生器的设计.     

多驱动器实现动态大容量影像实时存储

通过对单驱动器磁盘系统和由多驱动器配置构成的磁盘阵列系统存储性能的对比研究发现,多驱动器配置的磁盘阵列系统是解决动态大容量影像数据实时存储的有效解决方案。在多驱动器配置中应尽量使用具有异步I/O功能的SCSI磁盘以降低I/O系统对CPU的占用率,同时尽可能采用多个SCSI通道以进一步提高I/O性能。