Analysis of Sensing Errors for Manufacturing Geometric Objects from Sensed Data

In this work we address the problem of manufacturing machine parts from sensed data. Constructing geometric models for objects from sensed data is the intermediate step in a reverse engineering manufacturing system. Sensors are usually inaccurate, providing uncertain sensed information. We construct geometric entities with uncertainty models from noisy measurements for the objects under consideration, and proceed to do reasoning on the uncertain geometries, thus, adding robustness to the construction of geometries from sensed data.     

开放标准的数据交换协议与LBS平台开发

从统一标准的角度出发 ,参考了当前国外最新的研究 ,提出了一种用于 L BS平台上的 XML机制 ,XML已成为解决 LBS系统中诸如数据组织、传输、转换与共享 ,以及与互联网无缝结合等技术难题的主要途径     

基于XML的STEP产品数据网上描述与识别

为了实现STEP的XML表达,以STEP Part21物理文件为研究对象,首先分析了EXPRESS与XML语言并建立匹配关系;然后建立基于数据实例层次结构树的XML DTD以实现通用的、统一的XML表达;最后结合原型系统SX－Viewer的实现过程和结果证明其可行性和实用性。     

Modelling and Verification of PREMO Synchronisable Objects

The PREMO standard, Presentation Environment for Multimedia Objects, is a major new standard under development within ISO/IEC. It addresses the creation of, presentation of, and interaction with all forms of information using single or multiple media. In this paper we give a formal LOTOS specification, amenable to automatic verification, of the PREMO synchronisable object, which is one of the central parts of the standard. Various design options are investigated by a combination of constraint oriented specification and model checking. This shows the usefulness of formal specification and automatic verification during the design phase of an international standard. Received April 1997 / Accepted in revised form July 1998     

基于Harris和几何哈希法的目标匹配

复杂环境下的目标匹配会受到物体缩放、旋转、遮挡及光强变化等影响,是模式识别领域的一项难题。针对该问题,提出一种基于Harris算法和改进几何哈希法的目标匹配方法。利用Harris角点提取算法检测兴趣点,通过改进的几何哈希法实现多目标匹配。实验结果表明,该方法可实现复杂环境下的目标匹配,提高匹配精度和速度。     

The Geometric Modelling of Furniture Parts and Its Application

In this paper,3-D solid modelling method appropriate for the design of furnitrue parts,which has been used in FACD(Computer Aided Design for furnitre Structure)system,is introduced,Some interactive functions for modifying part models and deriving a variety of practical parts are described.Finally,the application of the modelling method to computer aided manufactureing of furniture parts is prospected.     

Privacy-Preserving Multiparty Collaborative Mining with Geometric Data Perturbation

In multiparty collaborative data mining, participants contribute their own data sets and hope to collaboratively mine a comprehensive model based on the pooled data set. How to efficiently mine a quality model without breaching each party's privacy is the major challenge. In this paper, we propose an approach based on geometric data perturbation and data mining service-oriented framework. The key problem of applying geometric data perturbation in multiparty collaborative mining is to securely unify multiple geometric perturbations that are preferred by different parties, respectively. We have developed three protocols for perturbation unification. Our approach has three unique features compared to the existing approaches: 1) with geometric data perturbation, these protocols can work for many existing popular data mining algorithms, while most of other approaches are only designed for a particular mining algorithm; 2) both the two major factors: data utility and privacy guarantee are well preserved, compared to other perturbation-based approaches; and 3) two of the three proposed protocols also have great scalability in terms of the number of participants, while many existing cryptographic approaches consider only two or a few more participants. We also study different features of the three protocols and show the advantages of different protocols in experiments.     

Gear Geometric Design by B-Spline Curve Fitting and Sweep Surface Modelling

In this paper, B-spline curve fitting and sweep surface generation are used for the geometric design of involute gears. Tooth profiles are described by a B-spline formulation based on interpolating data points with first and second derivative constrains. Tooth surfaces are generated by sweeping the B-spline profiles along specified trajectories. This representation scheme enables tooth shapes to be inter-actively controlled by manipulating control polygons and sweep trajectories. A CAD–CAE integration allows the analysis of contact and structural three-dimensional problems for various geometric configurations. In the paper, the methodology is applied to the geometric design of involute pinions of face gear drives.     

数据交换系统中交换引擎的设计与实现

介绍了XML用于数据交换及XML Schema用于数据描述的优点，设计了一个适用于大型层次网络结构的数据交换体系。重点讨论了交换引擎和交换流程的设计，提出了一种将数据标准与请求应答标准相结合的交换方式，实现数据跨平台、跨系统、跨数据库的共享与交换。     

XML及STEP标准在流程工业信息集成中的应用研究

流程工业中数据结构复杂,数据之间关系多种多样,如何对这些数据实现标准化处理是一件很困难的事。以前人们采用的方法多为各种零散的方法,或者是借助于制造行业发展起来的STEP来实现,但是STEP主要是用在表述结构化数据的,而对于非结构化数据以及半结构化数据的描述存在很大困难。因此,文中提出用XML来表述流程工业的非结构化数据和半结构化数据,采用XML与STEP标准结合的方式,实现对流程工业数据的集中处理,以便让那些建立在其上的其他信息处理过程中应用。文末给出了XML与STEP相结合所描述的一个典型过程工业信息集成应用案例。     

Flash的自我数据交换与传递

RIA技术的杰出代表Flash不单效果绚丽迷人,同时它也具有功能强大,易于编写等特点,具有很强的数据沟通能力。该文通过具体例子,深入浅出的探索了Flash与Flash之间的自我数据交换和传递编程技巧。     

MATLAB与Excel间的数据交换

用实例介绍了MATLAB与Excel间实现数据交换的方法和步骤,使用户能更充分地发挥这两大软件的优势。     

Matlab-Excel数据交换方法与实例

Excel目前是使用最为广泛的＂电子表格＂,Matlab以其强大的数值计算、统计分析功能和图形处理能力受到广大科技工作者的青睐,两者配合使用,降低了非计算机专业人士的编程难度,而两者之间的数据交换是其中的一个关键问题。通过实例给出了数据交换方法和使用经验。     

Excel与SQLite的数据交换

介绍了嵌入式数据库SQLite的基本特点和与Excel之间进行数据交换的基本解决方案,给出了一个实现示例.     

Flash的自我数据交换与传递

RIA技术的杰出代表Flash不单效果绚丽迷人,同时它也具有功能强大,易于编写等特点,具有很强的数据沟通能力。该文通过具体例子．深入浅出的探索了Flash与Flash之间的自我数据交换和传递编程技巧。     

MATLAN与Excel间的数据交换

用实例介绍了MATLAB与Excel间实现数据交换的方法和步骤,使用户能更充分地发挥这两大软件的优     

动态数据交换技术及其实现方法研究

随着软件系统开放性的日益增强,数据交换技术已成为越来越重要的一个研究课题。文章介绍了系统实现中采用的数据交换技术,着重研究了基于消息传递的动态数据交换技术（ＤＤＥ）的实现机理和利用其建立数据交换应用的方法。在实际系统的数据交换中应用ＤＤＥ技术,在实践中获得了良好的效果。文中还研究了ＤＤＥ技术的扩展,即对象链接与嵌入（ＯＬＥ）的原理和实现。