阶梯式模块多变量模型算法控制器研究

针对多变量过程控制问题,将模块多变量与预测控制中的模型算法控制相结合,提出了模块多变量模型算法控制器.它将控制目标按照优先级排序,从高到低依次实现各个控制目标.算法中引入阶梯式控制策略,使得解决动态MMC问题成为可能.并用Shell标准问题作为研究对象,对算法作出仿真验证.实验证明该算法结构简单,可以解决动态模块多变量的问题,计算量较小,设计和改造相对容易.这些特点使模块多变量模型算法控制器具有很高的应用价值.     

Real Time Equilibrium Reconstruction Algorithm in EAST Tokamak

The EAST (HT-7U) superconducting tokamak is a national project of China on fusion research, with a capability of long-pulse (∽1000 s) operation. In order to realize a longduration steady-state operation of EAST,some significant capability of real-time control is required. It would be very crucial to obtain the current profile parameters and the plasma shapes in real time by a flexible control system. As those discharge parameters cannot be directly measured,so a current profile consistent with the magnetohydrodynamic equilibrium should be evaluatedfrom external magnetic measurements, based on a linearized iterative least square method, which can meet the requirements of the measurements. The arithmetic that the EFIT (equilibrium fitting code) is used for reference will be given in this paper and the computational efforts are reduced by parametrizing the current profile linearly in terms of a number of physical parameters.In order to introduce this reconstruction algorithm clearly,the main hardware design will be listed also.     

Modular analysis and design of log-domain circuits based on LIN↔ELIN transformations

We systematized and developed some procedures for the modular design of externally-linear internally nonlinear (ELIN) circuits resulting in a general LIN↔ELIN transformation procedure. This one was also extended to analysis of these types of circuits. The procedure is exemplified on log-domain circuits. In the design one starts with the linear block diagram (LIN) described by transfer functions and one substitutes directly each linear building block by a corresponding nonlinear one. The parameters of each nonlinear component depend on the given parameters of its linear correspondent. Input F ⁻¹ and output F blocks are added. In the analysis one identifies the nonlinear basic circuit components and each of them is substituted by its corresponding linear building block. Input and output F ⁻¹-F cells are removed. The ideal transfer function can be calculated on the linear block diagram now. The LIN↔ELIN transformations make a direct connection between equivalent linear and ELIN circuits, simplify their design and analysis procedures and permit the development of CAD procedures.     

基于补码等价定义的Booth算法证明

Booth算法是定点补码乘法的基本运算方法。一般文献中,Booth算法都是通过校正法演变过度而来的,但校正法的运算规律不统一,硬件控制复杂,实用价值不大。在此给出了一种补码的等价定义,统一了补码定义的分段表示形式,把数字化的机器数符号纳入统一的表达式中,并在此基础上,消除了校正法作为中间环节的影响,直接给出了Booth算法完整的理论证明。结果表明,引入补码等价定义,可以完全避开校正法,直接推证出Booth算法,比传统方法更简明、严谨、实用。     

A New Algorithm for the Elimination of Common Subexpressions in Hardware Implementation of Digital Filters by Using Genetic Programming

A new algorithm based on Genetic Programming (GP) for the problem of optimization of Multiple constant Multiplication (MCM) by Common Subexpression Elimination(CSE) is developed. This method is used for hardware optimization for DSP systems. A solution based on Genetic Programming is shown in this paper. The performance of the technique is demonstrated in one- and multi-dimensional digital filters with constant coefficients.     

基于Canny算子的红外图像边缘检测研究

在红外图像处理中,提出了尺度相乘的Canny边缘检测器,定义了尺度相乘函数,该函数是两个尺度检测滤波器响应的乘积.通过确定尺度相乘后的梯度图像,采用非最大值抑制方法得到边缘图像.实验结果表明,该算子提高了传统Canny检测算子的性能,具有良好的检测精度,在定位和噪声抑制两方面得到了较好的折中.     

无向赋权图最短通路的矩阵算法

Dijkstra算法是求赋权图最短通路中最著名的算法.但其数学的表达式却非常复杂,而且只求出起点到各点的最短通路的权.通过对赋权图进行矩阵定义以及定义相应的矩阵运算法则,就可以求出任意两点间的最短通路的权.这一算法为求赋权图的最短通路及权的编程提供了算法模型.     

Generalized modular framework for the synthesis of heat integrated distillation column sequences

The synthesis of simple and Heat Integrated distillation column sequences is a challenging problem of high economic importance due to its structural and physical complexities and to its economic impact on chemical industries. In this paper this synthesis problem is addressed through a novel systematic superstructure representation method extending the principles of the Generalized Modular Framework (Papalexandri and Pistikopoulos, 1996. A.I.Ch.E. Journal 42 (4), 1010-1032). The method proposes systematic structural and physical models addressing the problem's inherent complexities, generating considerably compact optimization problems while avoiding the use of simplifying assumptions. The method employed for ternary and quaternary non-azeotropic separations is demonstrated over illustrating case studies obtaining the most energy efficient distillation column sequences and Heat Integration schemes and generating substantial energy savings.     

基于Booth编码模乘模块RSA的VLSI设计

在Montgomery模乘算法基础上，采用大数乘法器常用的Booth编码技术缩减Montgomery模乘法的中间运算过程，将算法迭代次数为原来的一半，同时采用省进位加法器作为大数加法的核心，使模乘算法中一次迭代的延迟为两个一位全加器的延迟，提高了处理器的时仲频率，在0.25μm工艺下，对于1024位操作数，可在200MHz时钟频率下工作，其加密速率约为178kbit/s。     

基于SHA-3的数字签名FPGA实现

针对RSA数字签名实现的速率和安全性问题,本文用FPGA实现了一个快速、高效、且结构紧凑的RSA数字签名算法。利用RSA 算法和keccak 算法作为主模块,其主要结构是根据Montgomery模乘算法和R＿L模式算法实现模幂运算,并提出利用新一代SHA-3算法--Kec-cak作为其单向hash函数,在进一步加强了签名的安全性同时,提升了运算的速率,最后利用流水线技术并行操作实现该签名。经过测试,完成1024 bit的模乘模块共用时7μs。