几种不稳定滞后对象的预测PID 控制

针对几种不稳定滞后过程，给出一种预测PID控制器的结构形式．该控制器具有内环和外环两种控制器：内环控制器主要用于稳定系统；外环控制器具有预测PID控制的结构形式，主要用于消除输入干扰的影响和改善控制系统的动态性能．这种控制器结构简单，可调参数少，且参数的调节方便、直观．仿真结果表明，在干扰和模型失配的情况下，此类预测PID控制器仍具有良好的控制性能和鲁棒稳定性能．     

ML08A1钢表面缺陷分析及改进措施

对影响邢钢ML08A1冷镦性能的钢坯和盘条表面缺陷进行了分析，针对不同的表面缺陷采取了积极的改进措施，使ML08A1盘条的表面质量和冷镦合格率均有较大程度的提高。     

一种异构网络环境中的性能管理策略

文中针对一种特殊环境下的异构网络,研究其环境下的通信过程中所呈现的传输特征。利用在网络监测过程中得到性能参数的统计信息对网络传输性能进行分析,并对网络性能管理中性能参数的变化规律进行讨论,论述了统计分析基本原理在性能评估中的应用。提出了在测量和分析过程中需要考虑的因素以及进行分析的方法,为管理人员直观了解网络运行状况提供了依据。     

参数自适应模糊PID控制器在温度控制系统中的应用

电阻炉模型参数具有随温度而变化的时变特性．当温度大范围变化时．采用常规PID控制方法不能满足较高工艺要求．为此，本文应用一种参数自适应模糊PID控制方法，并设计了基于单片机的温度控制硬件装置。实践证明该控制方法有较高的稳态精度和跟踪性。装置简单，运行效果较好。     

Multidimensional Cube Packing

We consider the d-dimensional cube packing problem (d-CPP): given a list L of d-dimensional cubes and (an unlimited quantity of) d-dimensional unit-capacity cubes, called bins, find a packing of L into the minimum number of bins. We present two approximation algorithms for d-CPP, for fixed d. The first algorithm has an asymptotic performance bound that can be made arbitrarily close to 2 – (1/2)^d . The second algorithm is an improvement of the first and has an asymptotic performance bound that can be made arbitrarily close to 2 – (2/3)^d . To our knowledge, these results improve the bounds known so far for d = 2 and d = 3, and are the first results with bounds that are not exponential in the dimension.     

Memory Management for Real-Time Java: An Efficient Solution using Hardware Support*

This paper addresses the issue of improving the performance of memory management for real-time Java applications, building upon the real-time specification for Java (RTSJ) from the Real-Time Java Expert Group. In a first step, a collecting dynamic memory solution including both a real-time garbage collector and region-based memory management, is proposed. A thorough analysis of the parameters influencing the performance of write barriers in memory management, together with ways of improvement are then presented. Finally, the implementation of a memory management solution compliant with the RTSJ and integrating the proposed improvements is sketched.     

A Scalable Interconnection Network Architecture for Petaflops Computing

Extrapolating technology advances in the near future, a computer architecture capable of petaflops performance will likely be based on a collection of processing nodes interconnected by a high-performance network. One possible organization would consist of thousands of inexpensive, low-power symmetric multiprocessor (SMP) nodes. Each node will inject data into the interconnection network at a very large rate and consequently, the interconnect scheme is one of the most crucial design issues affecting system performance. This paper describes the 2D simultaneous optical multiprocessor exchange bus (2D SOME-Bus) which has the potential to become the basis of a high-end computer architecture capable of petaflops performance. It consists of N horizontal, N vertical 1D SOME-Bus networks, and N ² nodes. Each node is connected to one horizontal and one vertical 1D SOME-Bus. Each of N nodes connected to one 1D SOME-Bus has a dedicated broadcast channel and an input channel interface based on an array of N receivers monitoring all N channels and allowing multiple simultaneous broadcasts. In the 2D SOME-Bus, messages being broadcast on one Bus can be broadcast in a cut-through manner on one or more Buses in the other dimension. This paper describes the optoelectronic devices and technology which make the 2D SOME-Bus possible, and the network interface organization. It also presents simulation results which compare the performance of the 2D SOME-Bus, the 1D SOME-Bus, the crossbar and the torus under the message-passing paradigm.     

ASME PTC4.4余热锅炉性能试验规程的特点和方法

介绍了ASME PTCA．4余热锅炉性能试验规程的试验项目、试验技术及方法，并重点对锅炉热效率试验技术及效率计算所采用的热损失法进行了论述。     

电站机组瞬态过程性能监测初探

建立了汽轮机系统的瞬态数学模型和电厂主要经济性能指标详细计算模型 ,与已有的锅炉动态数学模型组成电厂主要瞬态性能数学模型 ;应用连接策略将模型各模块连接为整体 ;针对某 2 0 0MW机组 ,进行了给水流量减少 5 % ,燃料量减少 2 6 %时机组瞬态经济性能的计算 ,并对计算结果进行了分析。从而为进一步得到在各种工况下 ,包括工况变动幅度较大时机组较准确的性能分析奠定了基础     

试析马钢H型钢厂绩效考核及其奖酬体系的变革过程

从马钢H型钢厂的筹备到正规组产的各个不同阶段时的所对应的绩效考核及其奖酬体系的变革从人力资源管理的角度试分析其内在关系,对这个国有特大型钢铁企业中的业绩考核及其奖酬体系在当今社会条件下所进行的实践进行一些有益的探讨.