GreeNet互联网访问控制系统性能测试及评价

介绍了一种对互联网访问控制系统的性能进行监测和分析的方法,该方法通过查看负载均衡模块上的数据包统计数据,检查GreeNet互联网访问控制系统的过滤性能,以便管理员对系统进行实时监测和事后性能分析,帮助找出性能瓶颈并加以改进,提高系统的性能。     

飞控FTI系统状态监测与数据分析系统设计与实现

在飞行试验工程中,机载测试系统完成对飞控数据的采集、封装和输出;为了实现基于USB的PCM数据解调及其与计算机之间的数据通信,实现实时的状态监测和数据事后分析处理,设计并实现了基于.NET框架的FCS-FTI系统状态监测与数据分析系统;该系统包括数据实时捕获、状态监测、数据事后处理等模块;测试表明,系统各功能模块运行稳定,能对FCS-FTI进行状态监测并能进行数据事后分析处理,具有高效的实时性和良好的可靠性。     

一种实用的并行程序可视化性能分析方法

并行程序由于自身的复杂性使得并行程序的调试相比串行程序要困难的多，因此用可视化的性能分析工具来辅助并行程序的调试显得非常重要，以此来帮助程序员找到程序的性能瓶颈，为并行程序的优化提供指导和建议。本文在研究MPE性能分析机理的基础上，介绍了一种实用的MPI并行程序可视化性能分析方法，并用实例详细说明了并行程序实时可视化性能分析和事后可视化性能分析过程。     

目标诸元图形化处理方法研究

利用TeeChart Pro工具开发出数据图像分析系统,具有实时数据监测和事后数据预处理的功能。通过MSComm控件实现串口通信以控制系统实时显示设备采集的数据来观测飞行器轨迹曲线,同时支持在界面上直接操作图像曲线以实现剔点功能,极大的方便了观测数据和修改数据。     

用单片机实现深度测量误差的实时校正

介绍了油井深度测量误差的事后校正和实时校正原理，对校正误差进行了分析，总结了实时校正的优点，给出了用单片机进行实时校正的处理流程。     

网络取证系统及工具分析

随着网络技术的发展,计算机网络犯罪总量持续上升,计算机取证工作显得越来越重要。计算机取证分为事后取证和实时取证。早期的实时取证所利用的网络安全工具在取证学角度都存在一定的局限性,它们所产生的数据不能成为法律意义上的证据。由此,网络取证系统应运而生,它对网络入侵事件、网络犯罪活动进行证据获取、保存、分析和还原,弥补了传统安全工具在实时取证中的不足。文中对网络取证系统进行了详细分析,并对目前的一些网络取证工具进行了比较。     

网络取证系统及工具分析

随着网络技术的发展,计算机网络犯罪总量持续上升,计算机取证工作显得越来越重要.计算机取证分为事后取证和实时取证.早期的实时取证所利用的网络安全工具在取证学角度都存在一定的局限性,它们所产生的数据不能成为法律意义上的证据.由此,网络取证系统应运而生,它对网络入侵事件、网络犯罪活动进行证据获取、保存、分析和还原,弥补了传统安全工具在实时取证中的不足.文中对网络取证系统进行了详细分析,并对目前的一些网络取证工具进行了比较.     

无线传感器网络的路由算法与仿真实现

无线传感器网络能够协作地实时监测、感知和采集各种环境或监测对象的信息，并对其进行处理，传送到信息接收者，其关键技术之一是路由算法及实现。分析了Directed Diffusion路由算法，用UML统一建模语言对该路由算法进行了建模，在网络模拟工具NS的模块上实现了对该路由算法的模拟仿真，分析了其时延、能耗、数据发送率等网络性能，并与Flooding路由算法作比较。仿真结果表明Directed Diffusion路由算法在某些方面有较好的特性。     

网络信息侦听系统的研究与实现

网络信息侦听是网络监测、负载分析等管理活动常用的方法,同时也是黑客非法窃取信息的手段。文章通过分析网络传输介质的共享特性,讨论了侦听系统在Windows下的实现,BPF结构及如何对其性能进行优化,为网络管理员对网络中的信息进行实时的监测、分析提供一个合适的工具,并探讨如何避免黑客利用侦听方式对网络进行攻击。     

Windows NT下某导弹实时采集系统的设计与实现

在某型号导弹系统的联试过程中，对产品输出的模拟量信息进行实时采集，监测，存储以及事后处理显得非常重要。本文简要论述了采集系统的总体设计方案和硬件配置结构，并详细介绍了在Windows NT环境下实现实时处理过程的软件设计方法。     

A frequency domain technique for range data registration

This work introduces an original method for registering pairs of 3D views consisting of range data sets which operates in the frequency domain. The Fourier transform allows the decoupling of the estimate of the rotation parameters from the estimate of the translation parameters, our algorithm exploits this well-known property by suggesting a three-step procedure. The rotation parameters are estimated by the first two steps through convenient representations and projections of the Fourier transforms' magnitudes and the translational displacement is recovered by the third step by means of a standard phase correlation technique after compensating one of the two views for rotation. The performance of the algorithm, which is well-suited for unsupervised registration, is clearly assessed through extensive testing with several objects and shows that good and robust estimates of 3D rigid motion are achievable. Our algorithm can be used as a prealignment tool for more accurate space-domain registration techniques, like the ICP algorithm.     

A decision support tool for evaluating customer intentions

It is crucial for any manager to keep a close watch on customer satisfaction, customer loyalty and the customer’s intention to recommend the company. In this article, a new decision support tool is developed to support a manager with this task. This tool has been developed with companies in mind that posses limited customer satisfaction data. It uses model-based knowledge discovery to extract the customer’s expectation and the expectation-performance compatibility from the data. Two hypotheses are formulated which posit that compatibility between product performance and customer expectation have a positive influence on the customer’s intentions. Both hypotheses are supported by the data. Finally, a decision support tool is developed which visualizes the impact of customer satisfaction, product performance and expectation-performance compatibility on the customer’s intentions. The decision support tool contains three views which offer the manager important information at a glance.     

电子政务绩效管理的平衡计分卡实施

平衡计分卡在公共管理领域的应用,取得了一定的成果,也出现了不少仍需完善的地方,文章力求在新的视角下分析并构建合理的电子政务平衡计分卡体系.结合公共管理的价值取向确定了平衡计分卡的核心价值,综合分析了平衡计分卡四个维度关联,找到了电子政务绩效管理与平衡计分卡的内在切合,构建了基于电子政务的绩效评估体系的平衡计分卡实施框架.     

Synchronous incremental update of materialized views for PostgreSQL

Materialized views are logically excess stored query results in SQL-oriented databases. This technology can significantly improve the performance of database systems. Although the idea of materialized views came up in the 1980s, only three database management systems, i.e. DB2, Oracle, SQL Server, have been successfully developed completely enough with materialized views so far. The barrier lies in building a module that can incrementally update the materialized views automatically, which corresponds to data changes in the base tables. This paper presents the algorithm to incrementally update the materialized views with inner join, focusing on one with aggregate functions, and building of a program that automatically generates codes inPL/pgSQL for triggers, which can undertake synchronous incremental updates of the materialized views in PostgreSQL.     

Performance evaluation of View-Oriented Transactional Memory

This paper extensively evaluates the performance of View-Oriented Transactional Memory (VOTM) based on two implementations that adopt different Transactional Memory (TM) algorithms. The Restricted Admission Control (RAC) mechanism in VOTM plays a key role in the performance gains of VOTM. In this paper, we use six applications to evaluate the performance advantage of VOTM. Experimental results show that partitioning shared data into separate views can improve performance when one of the views has high contention while others may have low contention, because the contention of each view is independently controlled by RAC. For memory-intensive applications, even when the contention on application data is not high enough to justify admission control by RAC, partitioning shared data into different views can improve the performance of TM systems due to the reduced contention on the metadata of the TM systems.     

A multi-layer multi-view architecture for software engineering environments

This paper presents our experience with constructing a multi-view environment for software process modeling. The environment (Spearmint) is designed to support the capture, analysis and maintenance of large, complex software process models. The environment uses multiple views to handle the inherent complexity of real software processes and to model the fact that different people within organizations have different, sometimes conflicting, views of the same process. Spearmint also supports multiple display representations for process information and addresses requirements for good maintainability, extensibility and performance. Our experience has been that a layered architecture that makes a clear separation of concerns in the application is invaluable for implementing such a multi-view tool. In this paper, we describe some of the experiences we have had with designing and implementing such an architecture.     

FromDaDy: Spreading Aircraft Trajectories Across Views to Support Iterative Queries

When displaying thousands of aircraft trajectories on a screen, the visualization is spoiled by a tangle of trails. The visual analysis is therefore difficult, especially if a specific class of trajectories in an erroneous dataset has to be studied. We designed FromDaDy, a trajectory visualization tool that tackles the difficulties of exploring the visualization of multiple trails. This multidimensional data exploration is based on scatterplots, brushing, pick and drop, juxtaposed views and rapid visual design. Users can organize the workspace composed of multiple juxtaposed views. They can define the visual configuration of the views by connecting data dimensions from the dataset to Bertin's visual variables. They can then brush trajectories, and with a pick and drop operation they can spread the brushed information across views. They can then repeat these interactions, until they extract a set of relevant data, thus formulating complex queries. Through two real-world scenarios, we show how FromDaDy supports iterative queries and the extraction of trajectories in a dataset that contains up to 5 million data.     

物化视图合并的一种新算法

用视图优化查询是提高数据库响应性能的重要手段，所以减少视图的搜索空间有非常重要的意义。该文提出了视图合并的一种新算法――匹配合并法，该算法大大地扩展了视图合并范围。为了更快地进行匹配合并，还提出了一种有效的索引结构――双分解树，通过分解视图集来达到快速合并视图的目的。实验表明，该合并算法改进了数据库的查询性能。     

GMB: A tool for manipulating and animating graph data structures

This paper describes a tool graph originally developed for the Faust environment. Faust is a scientific program development environment being implemented at the Center for Supercomputing Research and Development at the University of Illinois at Urbana-Champaign. The graph tool comprises two major components: the Graph Manager that implements an abstract graph data type, and the Graph Browser that handles the details of displaying a subgraph of a graph created through the Graph Manager. The Graph Browser displays graph views, where a graph view is a subgraph of its parent graph. The concept of graph views is analogous to the concept of views in the traditional database sense. Several graph views may simultaneously exist for a single parent graph, where each view's subgraph depends on the context of the application requesting the view. Goals of the graph tool, GMB, included providing an abstract graph data type for general use and animating graphs efficiently.     

VP^4:基于机群的pvm并行程序性能可视化工具

本文研究并实现了一个通用的 pvm并行程序性能可视化软件工具 VP^4.针对工作站机群的特点 ,它采用多层次性能数据采集方法和基于事件的采取策略 ,这样可以在尽量减少“侵入影响”的前提下 ,采集并汇总全部性能数据 .对汇总的性能数据进行处理后 ,VP^4利用图形与动画生成各种易于使用的可视化性能视图 .通过实验表明 ,本软件工具可以有效地帮助用户发现性能瓶颈 ,辅助用户开发高性能的并行程序 .