基于SOA的监管信息共享平台的研究与设计

为了解决监所信息共享的问题,提出了按照SOA架构建立数据共享平台的设计方案.方案将系统分为数据层、服务层和应用层三个部分,并详细介绍了每个部分的实现思路.服务层采用Web Services技术将数据共享核心业务封装成一系列的Web服务,这种机制不仅具有良好的扩展性,而且支持不同的数据源和不同的平台.实际应用表明该方案很好地解决了异构平台间监所信息共享的问题.     

基于RESTful Web技术的资源管理系统设计与实现

随着Web技术的进步,对资源管理平台的功能需求不仅仅局限于管理实体资源对象,还包括将异种异构的资源封装成统一资源进行描述并加以管理的能力。Web资源管理平台接入的资源描述信息往往具有海量、异构和可变的特性。提出一种应用RESTful(Representational State Transfer)风格Web服务架构与NoSQL(非关系型数据库)技术的资源管理三层架构系统,并将其实现为基于.NET的WCF RESTful Web服务,实现资源的操作、配置、状态监控以及数据管理功能。     

基于云计算的广域级视频监控综合业务平台

针对目前广域级的视频监控项目遇到的各种问题,设计了一种基于SOA架构和云计算技术的视频监控综合业务平台.采用云计算中的虚拟化技术对平台底层中多种异构软硬件资源进行整合管理,采用HDFS分布式文件系统和HBase分布式存储系统对海量视频数据进行高效的分布式存储管理,采用MapReduce分布式编程框架实现用户业务的分布式并行处理与资源调度.在此基础上,众多用户业务最终实现为云服务并在SOA架构下部署成为分布式系统,有效实现业务流程的整合及融合.     

基于SOA的区域内高校校际间网上资源共享和协作服务模式研究*

为了提高高校资源的利用率,利用当前各高校信息化工作的成果,提出了一个基于SOA的Web服务组合的校际间资源共享协作服务的方案。该方案立足各高校已建成业务系统,对原有功能进行Web服务封装,利用Web服务复用,通过工作流引擎驱动业务流程的模式,满足校际间逻辑业务的新需求。该协作服务模型有别于高校内部应用整合的系统集成方案,是一种松耦合的业务功能组合模式,高校内原有业务系统的升级改造不会影响校际间的逻辑业务功能的实现。该成果适用于新建业务与原有业务没有严格上下级关系的应用场景。     

一种基于主体的语义Web服务模型

要实现Web服务组合自动快速准确性,必须对Web服务进行语义标注,使计算机能在"理解"服务的基础上实现快速准确查找和自动组合.Agent以其独特的性质,被普遍认为是可以代替人做出某些行为的实体.借鉴主动服务的思想,在传统面向服务体系架构(SOA)的基础上,将Agent技术引入到SOA模型中,提出了一种基于主体的语义Web服务模型,采用Agent来封装不同角色模块,使得Web服务的调用和组合过程可看成是代表各自角色的A-gent之间的协商和协作解决问题的过程.     

基于SOA架构的Web服务组合系统

应用SOA架构是构建松散耦合Web服务组合系统的一个有效途径.本文在深入研究Web服务组合系统一般工作流程的基础上,提出了一种基于SOA架构和分层协议栈机制构建Web服务组合系统的方法,给出了服务分层模型和分层协议栈,设计并实现了一个基于SOA架构的松耦合原型系统来实现Web服务组合,可为Web服务组合的研究和企业应用提供灵活的实验及应用开发平台.     

基于异构Web服务的虚拟实验平台

目前大部分虚拟实验平台缺乏对异构组件的支持。为此,提出一种基于异构Web服务的虚拟实验平台,该平台采用Web服务技术,以其语言独立性、平台无关性等特点,将异构组件进行Web服务化封装,解决异构组件的通信问题,提高开发效率,实现组件重用。介绍系统平台的架构模型和系统实现的关键技术,讨论对异构组件进行服务化封装及实验流程执行引擎的设计与实现过程,并以该平台为基础,通过Web服务封装将C++和Matlab开发的图像处理组件集成到系统中,构建数字图像处理虚拟实验室。     

基于SOA的应急数据交换系统设计与实现

省级政府各个部门正积极建设各自的应急平台,但是由于早期没有统一的规划,各个单位或者部门的应急系统采用了不同的系统环境和实现技术,导致了”信息孤岛”的形成,异构应急平台间的数据交换成为一个新的课题.通过考察省级应急平台的现状,提出在SOA体系架构基础上,利用Web服务技术和基于消息中间件的ESB实现支持异构的、易于扩展的、可复用的数据交换平台,并给出了基于SOA软件架构和ESB的数据交换系统的具体实现.SOA架构和ESB的应用保证了数据交换的高效性和可靠性,从而解决了各应急平台间互通互联的问题.实践证明SOA架构和ESB是解决系统间数据交换的有效手段.     

支持四方物流的Web服务集成平台的设计与实现

实现异构平台间的信息交互及交互自动化是在三方物流基础上构建四方物流管理系统的关键问题。提出了基于Web服务的四方物流集成平台,它将各类三方物流提供商的信息资源和软件系统进行统一封装;并将基于关键字的Web服务查询、基于wsdl4j和castor的WSDI动态分析、基于saaj的SOAP封装和基于jdom的SOAP应答消息解析封装成一个整体,为四方物流管理系统提供一系列的服务调用接口,从而实现了异构平台间的自动信息交互。     

基于SOA的Web Service组合研究及应用

针对目前SOA研究现状,对SOA、Web Service和Web Service组合模式予以分析研究,构建出基于SOA的Web Service组合模式及运行时架构,以实现对互联网上相关子系统资源共享、平台独立和松散耦合,为互联网上信息系统开发提供新的解决方案.最后,应用此组合模式及架构开发项目“研究生实习实践综合管理信息系统”中学院导师管理模块Web服务,说明此架构在Web Service及信息系统中的适用性.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

Enhancing a leaf radiative transfer model to estimate concentrations and in vivo specific absorption coefficients of total carotenoids and chlorophylls a and b from single-needle reflectance and transmittance

The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm², BIAS = 0.143 µg/cm², RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm², BIAS = − 0.992 µg/cm², RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm², BIAS = − 2.12 µg/cm², RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.     

Mr. Twinn’s bombes

This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).