基于构件的可重构制造执行系统研究

制造执行系统是实现企业信息集成的关键技术,是企业信息化工程领域的研究热点之一。分析了制造执行系统的定义和功能,并提出基于软件构件的可重构制造执行系统的软件体系结构和实现方法。可重构制造执行系统的开发与运行实践表明,可重构制造执行系统的软件开发效率高、周期短、可扩展性好。     

试论MES系统在企业中的设计与实现

讨论和分析了MES系统对于中铝欠冶铜板带有限公司在生产管理方面的重要意义,并对MES系统的设计和实现等问题,给出了其体系结构设计和应用功能设计的一般概念以及实现方法。对一般有色冶金工厂类似的系统的设计和实现可供借鉴。     

MO-PSE: Adaptive multi-objective particle swarm optimization based design space exploration in architectural synthesis for application specific processor design

Architectural synthesis has gained rapid dominance in the design flows of application specific computing. Exploring an optimal design point during architectural synthesis is a tedious task owing to the orthogonal issues of reducing exploration time and enhancing design quality as well as resolving the conflicting parameters of power and performance. This paper presents a novel design space exploration (DSE) methodology multi-objective particle swarm exploration MO-PSE, based on the particle swarm optimization (PSO) for designing application specific processor (ASP). To the best of the authors’ knowledge, this is the first work that directly maps a complete PSO process for multi-objective DSE for power-performance trade-off of application specific processors. Therefore, the major contributions of the paper are: (i) Novel DSE methodology employing a particle swarm optimization process for multi-objective tradeoff, (ii) Introduction of a novel model for power parameter used during evaluation of design points in MO-PSE, (iii) A novel fitness function used for design quality assessment, (iv) A novel mutation algorithm for improving DSE convergence and exploration time, (v) Novel perturbation algorithm to handle boundary outreach problem during exploration and (vi) Results of comparison performed during multiple experiments that indicates average improvement in the quality of results (QoR) achieved is around 9% and average reduction in exploration time of greater than 90% compared to recent genetic algorithm (GA) based DSE approaches. The paper also reports results based on the variation and impact of different PSO parameters such as swarm size, inertia weight, acceleration coefficient, and termination condition on multi-objective DSE.     

Derivation of optimal input parameters for minimizing execution time of matrix-based computations on a GPU

As GPUs are continually being utilized as coprocessors, the demand for optimally utilizing them for various computations continues to grow. The goal of this work is to derive input parameters which yield the minimum execution time for matrix-based computations executing on a GPU. Input parameters are defined as the dimensions of the grid and blocks assigned for execution on the GPU. Since input parameters inadequately represent the executional behavior of the GPU, execution metrics are formulated as functions of the input parameters to represent the behavior. The execution metrics are architecture independent and are utilized to derive optimal input parameters, which are input parameters that yield the minimum execution time. Optimal input parameters are derived for the following matrix-based computations: matrix–vector multiplication (Mv), matrix–matrix multiplication (MM), and convolution. The derivation allows for selection of optimal input parameters without executing code. Results, for all matrix-based computations and sizes tested, show that utilizing the derived optimal input parameters often yields the minimum execution time, and, at worst, execution time within 13.6% of the minimum.     

抗板级物理攻击的持久存储方法研究

为保护文件系统的安全性,提出一种抗板级物理攻击的持久存储方法。利用ARM TrustZone技术构建持久存储架构,实现内存保护机制和持久存储保护服务,提高文件系统的物理安全性。基于片上内存（OCM）在可信执行环境（TEE）中的内核层建立内存保护机制,保证TEE的可信应用能够抵抗板级物理攻击。基于TEE的内存保护机制实现保护文件系统中敏感数据的持久存储保护服务,确保文件系统的机密性和完整性。在物理开发板上实现持久存储架构的原型系统,使用基准测试工具对原型系统进行性能评估,并分析性能损耗的原因。测试结果表明,内存保护机制在保护TEE系统物理安全性时引入的时间开销会随着OCM的增大而减小,持久存储保护服务在保护数据量较小的敏感数据时产生的时间开销在用户可接受范围内。     

基于DOTNET平台的车间资源集成研究与实践

车间资源集成及其网络化是企业实施网络化战略的基础=分析了在网络化制造环境下车间制造执行系统(MES)存在的问题及功能的局限性；指出了在网络化制造环境下进行车间制造资源内部集成、外部公布的必要性和实用性；探讨了基于车间制造资源建模网络层次结构和集成框架：提出了基于．NET平台的车间资源集成化及网络化的实际解决方案，给出了具体的系统开发实例。     

柔性制丝线批次管理模式的研究与应用

为使卷烟企业可根据产品的特性灵活选择和安排处理工序,实现各个制丝处理工序的“单元化”和“模块化”,拓宽对于新产品的适应性,提出了基于ISA-SP95的柔性制丝线批次管理模式,并结合柔性制丝工艺的特征建立批次管理模型.通过MES系统与制丝集控系统的应用集成实现批次调度功能;基于批次控制软件实现制丝生产批次的精确化、智能化控制.柔性制丝批次管理模式应用于龙岩卷烟厂“精品线”技改项目,实现了生产管理与过程控制的整体集成和融合应用,满足了柔性制丝线分组加工、精确控制的工艺要求,较好地解决了原系统中生产资源调整困难和新产品研发适应性差等问题.     

主动网络的概念应用及其范例

主动网络是可编程网络,主动网络中的网络结点具有计算能力,它能对流经本地的数据进行计算和修改,本文介绍了主动网络（active network)的应用,实现方案并通过具体实例Bowman和CANEs来阐述。     

The impact of predictive inaccuracies on execution scheduling

This paper investigates the underlying impact of predictive inaccuracies on execution scheduling, with particular reference to execution time predictions. This study is conducted from two perspectives: from that of job selection and from that of resource allocation, both of which are fundamental components in execution scheduling. A new performance metric, termed the degree of misperception, is introduced to express the probability that the predicted execution times of jobs display different ordering characteristics from their real execution times due to inaccurate prediction. Specific formulae are developed to calculate the degree of misperception in both job selection and resource allocation scenarios. The parameters which influence the degree of misperception are also extensively investigated. The results presented in this paper are of significant benefit to scheduling approaches that take into account predictive data; the results are also of importance to the application of these scheduling techniques to real-world high-performance systems.     

个人网页设计与制作

介绍了创建个人网页的原则、设计与制作的关键步骤和主要程序．并提出了个人网页设计与制作的注意事项。