酒钢3~#焦炉计算机加热控制系统

介绍了酒泉钢铁公司新建3#焦炉计算机加热控制系统的方案，硬件和软件配置；系统实际运行情况。     

Extracting Schema from an OEM Database

While the schema-less feature of the OEM(Object Exchange Modl)gives flexibility in representing semi-structured data,it brings difficulty in formulating database queries. Extracting schema from an OEM database then becomes an important research topic.This paper presents a new approach to this topic with th following reatures.(1)In addition to representing th nested label structure of an OEM database,the proposed OEM schema keeps up-tp-date information about instance objects of the database,The object-level information is useful in speeding up query evaluation.(2)The OEM schema is explicitly represented as a label-set,which is easy to construct and update.(3)The OEM schema of a database is statically built and dynamically updated.The time complexity of building the OEM schems is linear in the size of the OEM database.(4)The approach is applicable to a wide range of areas where the underlying schema is much smaller than the database itself(e.g.data warehouses that are made from a set of heterogeneous databases).     

并行工程模式下企业管理决策的几个问题及其求解

针对并行工程模式下企业管理决策的典型问题,建立一组以省时为优化目标的数学模型。这些模型能较好地表现并行工程哲理的并行性、约束性和协调性特征。讨论了模型的求解,并给出一个算例。     

Post-pass partitioning of signal processing programs

Symmetric multiprocessor systems are increasingly common, not only as high-throughput servers, but as a vehicle for executing a single application in parallel in order to reduce its execution latency. This article presents Pedigree, a compilation tool that employs a new partitioning heuristic based on the program dependence graph (PDG). Pedigree creates overlapping, potentially interdependent threads, each executing on a subset of the SMP processors that matches the thread’s available parallelism. A unified framework is used to build threads from procedures, loop nests, loop iterations, and smaller constructs. Pedigree does not require any parallel language support; it is post-compilation tool that reads in object code. The SDIO Signal and Data Processing Benchmark Suite has been selected as an example of real-time, latency-sensitive code. Its coarse-grained data flow parallelism is naturally exploited by Pedigree to achieve speedups of 1.63×/2.13× (mean/max) and 1.71×/2.41× on two and four processors, respectively. There is roughly a 20% improvement over existing techniques that exploit only data parallelism. By exploiting the unidirectional flow of data for coarse-grained pipelining, the synchronization overhead is typically limited to less than 6% for synchronization latency of 100 cycles, and less than 2% for 10 cycles. This research was supported by ONR contract numbers N00014-91-J-1518 and N00014-96-1-0347. We would like to thank the Pittsburgh Supercomputing Center for use of their Alpha systems.     

提高工作站机群系统通信性能方法的研究

工作站机群系统是目前并行处理技术的研究特点之一，而春网络通信的性能又是机群系统的关键。本文在分析影响系统性能因素的基础上，从软、硬件两方面着重讨论了高速网络技术，精简通信协议和Ａｃｔｉｖｅ Ｍｅｓｓａｇｅ通信机制等提高网络通信性能的方法。     

贯流式水轮机线性调速器研究

采用常规ＰＩＤ控制的贯流式水轮机调节系统在弧立运行时难以稳定。本在分析ＰＩＤ控制的不足之后，提出了状态反馈优化控制，从而从根本上改善了贯流式水轮机调节系统的稳定性和动态品质。     

电站锅炉锅筒温度场计算——三维非稳态变物性材料不均匀导热问题有限元分析

通过对某国产３００ＭＷ机组锅炉锅筒在启动过程中的温度分布进行三维非稳态变物性材料不均匀导热问题有限元分析，得出了在常用简化温度边界条件下的温度分布，并讨论了制订标准时材料定性温度的选取     

工业电视摄像机在钢管质量检测中的应用

本文介绍了一种在工业中检测细长钢管内表面质量的光电检测设备。该设备利用工业电视摄像机来提取被检测钢管内表面的图像信息，以IBM－PC／AT486机作为控制与图像处理系统，主要用于各种细长钢管内壁疵病的实时自动检测。     

静态等值的一种新方法

本文以静态Ward等值法为基础，结合模糊数学理论应用灵敏度分析法，提出了一种新的静态等值方法．例系统计算结果表明，本文提出的方法具有较好的准确度．     

馈线自动化网络可靠性模型算法及其可靠性评估

本文在分析常见的单，双侧电源线自动化网络的基础上，提出了馈线自动化网络元件的可靠性模型，列出状态概率方程，并进行平稳状态的概率计算，最后利用故障模式及后果分析法对常见的单，双侧民源馈线自动化网络进行了可靠性评估。