基于XML Schema的Xpath查询优化

该文分析Xpath表达式中出现(任意匹配字符)和//(子孙轴)对查询效率的影响,提出用XMLSchema对Xpath表达式进行约束来解决问题,给出实现的核心算法。     

基于模式的XML文档元素的序列化标识

在XML文档中,对象的顺序包含语义。为了提高查询和插入操作的效率,对象标识(OID)需要序列化。现在普遍采用的OID序列化方法是前序算法,但是该算法代价很大。该文设计了基于模式的OID序列化算法。算法的核心是OID区间预留,以实例文档的模式和统计信息为基础,将计算机可以表达的整数分成区间,然后将对象映射到区间内,从而给所有对象赋予OID。新算法大大降低了XML文档序列化的开销。     

基于Motor Schema的多移动机器人队形优化控制

针对多移动机器人的队形优化控制任务,引入4种基本行为,即奔向目标行为、保持队形行为、避免与静态障碍物碰撞行为、避免与其它机器人碰撞行为.为了实现行为的决策,机器人采用基于MotorSchema的结构,并通过遗传算法优化行为合成所需的控制参数.仿真结果表明,所提出的方法是可行的.     

VISOR: Schema-based scene analysis with structured neural networks

A novel approach to object recognition and scene analysis based on neural network representation of visual schemas is described. Given an input scene, the VISOR system focuses attention successively at each component, and the schema representations cooperate and compete to match the inputs. The schema hierarchy is learned from examples through unsupervised adaptation and reinforcement learning. VISOR learns that some objects are more important than others in identifying the scene, and that the importance of spatial relations varies depending on the scene. As the inputs differ increasingly from the schemas, VISOR's recognition process is remarkably robust, and automatically generates a measure of confidence in the analysis.     

Reducing the wrapping effect

When solving ODEs by interval methods, the main difficulty is reducing the wrapping effect. Various solutions have been put forward, all of which are applicable for narrow initial intervals or to particular classes of equations only. This paper describes an algorithm which, instead of intervals, uses a larger family of sets. The algorithm exhibits a very small wrapping effect and applies to any type of equation and initial region. For the time being it handles only two-dimensional equations.     

Constructing developable surfaces by wrapping cones and cylinders

We model developable surfaces by wrapping a planar figure around cones and cylinders. Complicated developables can be constructed by successive mappings using cones and cylinders of different sizes and shapes. We also propose an intuitive control mechanism, which allows a user to select an arbitrary point on the planar figure and move it to a new position. Numerical techniques are then used to find a cone or cylinder that produces the required mapping. Several examples demonstrate the effectiveness of our technique.     

Rigorously computed orbits of dynamical systems without the wrapping effect

A new method for rigorously computing orbits of discrete dynamical systems is introduced. High order zonotope enclosures of the orbit are computed, using only matrix algebra. The wrapping effect can be made arbitrarily small by choosing the order high enough. The method is easy to implement and especially suited for parallel computing. It is compared to other well known strategies, and several examples are given.     

R2LD: Schema-based Graph Mapping of relational databases to Linked Open Data for multimedia resources data

Multimedia Tools and Applications - The Web of Data used to share and interchange the diverse data of heterogeneous types on the Web has been actively established. Ontology-based Linked Open Data...     

Automatically wrapping legacy software into services: A grid case study

The computational grid is rapidly evolving into a service-oriented computing infrastructure that facilitates resource sharing for solving large-scale data and computationally intensive problems. Peer-to-peer (P2P) systems have emerged as an infrastructure enabling technologies for enhanced scalability and reliability in file sharing and content distribution. It is envisioned that P2P enabled service-oriented grid systems would virtualize various resources as services with high scalability and reliability. Many legacy software resources exist nowadays, but making them grid aware services for effective resource sharing has become an issue of vital importance. This paper presents GSLab, a toolkit for automatically wrapping legacy software into services that can be published, discovered and reused in grid environments. GSLab employs Sun Grid Engine (SGE) to enhance its performance in execution of wrapped services. Using GSLab, we have automatically wrapped a legacy computer animation rendering code written in C as a service that can be discovered and accessed in a SGE environment. The evaluation results show that the performance of GSLab improves with an increase in the number of computing nodes involved.

Informed RRT* with improved converging rate by adopting wrapping procedure

Wrapping-based informed RRT*, proposed in this paper, combines a size-diminishing procedure, i.e., ‘wrapping procedure’ with informed RRT*, which samples random path nodes within a hyperellipsoid. The major and minor axes of the hyperellipsoid are determined by the initial and final configurations and current best solution’s path cost. Wrapping-based informed RRT* can advance from the first solution acquired by the planner to an improved, feasible solution which can drastically reduce the size of the hyperellipsoid. This leads to much quicker convergence to the optimal value of the path cost, resulting in the minimum action of the robot joints. The algorithm was tested in various environments with different numbers of joint variables and showed much better performance than the existing planners. Furthermore, the wrapping procedure proved to be a comparably insignificant computational burden regardless of the number of dimensions of the configuration space.     

结合网站内容和结构进行的Web日志挖掘

提出一种以聚类为基础的Web日志挖掘方法：从Web日志事务、Web站点内容和Web站点结构3个不同方面来聚类页面集合,并通过将用户的访问记录和页面聚集进行匹配和相关度计算,来预测用户感兴趣的页面。     

Web evolution and Web Science

This paper examines the evolution of the World Wide Web as a network of networks and discusses the emergence of Web Science as an interdisciplinary area that can provide us with insights on how the Web developed, and how it has affected and is affected by society. Through its different stages of evolution, the Web has gradually changed from a technological network of documents to a network where documents, data, people and organisations are interlinked in various and often unexpected ways. It has developed from a technological artefact separate from people to an integral part of human activity that is having an increasingly significant impact on the world. This paper outlines the lessons from this retrospective examination of the evolution of the Web, presents the main outcomes of Web Science activities and discusses directions along which future developments could be anticipated.     

Modeling muscle wrapping and mass flow using a mass-variable multibody formulation

Multibody System Dynamics - Skeletal muscles usually wrap over multiple anatomical features, and their mass moves along the curved muscle paths during human locomotion. However, existing...     

使用框架构建Web应用系统

为了更好地构建易编写、结构清晰、可扩展的Web应用系统，人们提出了大量的Web框架，其中最具代表性的就是Struts。在一定程度上，Web框架达到了这一要求。文中对Struts作了简单的分析和介绍；再结合具体的Web应用要求，以面向对象的设计方法和设计模式的思想为指导，根据这些具体应用的要求和特点扩展了Struts框架。扩展后的框架较好的实现了模式一视图一控制器中的控制器层，同时也解决了一些实际的Web应用系统中的常见的如权限验证、日志记录等问题。     

Web3.0网站应用开发

文章首先阐述了Web3.0的发展趋势,然后通过分析国内Web3.0网站,描述了Web3.0技术特性,最后提出了用户在Web3.0网站的搭建个人网站的方法。     

Web Services与传统Web应用

本文针对Web Services技术实质以及与传统Web应用区别，分别从技术、商务价值和编程实现上进行了比较研究，展现了Web Services的独特之处与应用前景。