一种大规模地形的快速漫游算法

地形漫游在仿真、模拟、虚拟现实等领域中有着广泛应用。大规模地形的实时漫游算法一般采用视见体裁剪和与视点相关的连续细节层次等技术来减少实际绘制的地形数据量。通过地形分块和视见体投影三角形扫描算法实现快速裁剪，通过调整顶点的高度值消除裂缝，通过基于三角形的四叉分割实现连续细节层闪地表简化，简化了算法实现，提高了算法效率，在没有利用帧连贯性的情况下，算法可以在PC机上实现较大规模地形的快速交互式漫游。     

遥感提取叶面积指数的地形影响分析

结合1：50000DEM对贵州省黎平县内研究区的ETM 遥感影像进行地形纠正，分别使用地形纠正前后的图像建立植被指数与实测杉木林、阔叶林、竹林的叶面积指数相关关系，从而对研究区森林叶面积指数进行计算。研究表明，利用遥感影像计算山地丘陵林区叶面积指数时地形是一个重要的影响因素，它致使遥感影像提取的叶面积指数出现一定的偏差。因此．本文从电磁波辐射传输理论着手，采用一种地形影响去除方法，即先把遥感图像归一化为没有地形影响下的亮度图像，再通过该亮度图像提取森林叶面积指数，并通过实地观测数据验证了该地形纠正方法的有效性。同时，也提出了利用地形因子和遥感影像亮度值的关系计算大气程辐射的方法。     

一般型最优有限预见控制及其在地形跟踪中的应用研究

提出一种新的预见控制方法－－一般最优有限预见控制方法，并将其应用于巡航导弹地形跟踪控制设计。将参考信号和干扰信号考虑成更一般的形式，在其自相关函数数值已知的条件下，得到了一般型有限预见伺服系统设计问题的最优解。通过仿真证实，采用该方法设计地形跟踪系统，可以明显地改善巡航导弹的地形跟踪性能。     

利用小波进行多尺度地形生成方法的研究

针对随机中点位移法难以生成符合ｆＢｍ特征的三维地形之缺点，本文把地形看成层次性随机统计过程，提出了利用小波进行多尺度地形生成的新方法，首先利用扩展的随机－相关法按给定的地形参数（均值、地形高程标准差、地形相关长度、地形粗糙度等）形成一定数量用来表示地形骨架的地形特征点，然后与通过小波机制产生的多尺度地形局部细节信号相综合，通过小波多尺度合成获得符合要求的具有任意细节水平的“真实”的三维地形。试验证明这一方法切实可行，可作为随机中点位移法的改进     

适应地形实时生成的地形数据简化

出于对大范围地形场景实时生成的需要，提出了一种地形数据简化的方法。首先基于“分而治之”思想给出规则数据分割的概念，并给出数据分割算法，然后通过将地形数据的高度值解释为二维图像元素的灰度值，把地形数据变成平面图像，再利用数字图像处理的方法获得地形特征，提出了两种地形分类简化模型，即基于熵的地形类型划分模型和基于DEM数据统计特性的地形类型划分模型，最后比较了不同地形特征的数据简化结果。     

基于人工神经网络的地形线性化方法

地形线性化方法对地形辅助导航系统性能有重要的影响。本文采用人工神经网络这一新技术来分块记忆地形数据，给出数字地图上任意位置的线性化参数，并用于系统状态的扩展卡尔曼滤波，与其他传统地形线性化方法相比，用人工神经网络来处理地形函数，系统滤波性能得到改善，提高了导航精主工，并可减少地图的存贮量，适用并行处理。     

一种地形数据压缩的自适应分块编码方法

地形数据的空间自相关性有着很强的方向属性。为了充分地利用这一属性来消除地形数据之间的信息冗余度，本文提出了一种自适应分块的编码方法。首先确定地形带的自相关方向属性，然后依照地形方向性的不同，将数据按不同矩形形状进行方块划分，然后对较平坦的地形块和剧烈变化的地形块分别采用ＭＶＱ方法和ＢＴＣ－ＶＱ方法进行编码，以保护边缘信息。这种采用自适应分块式的编码方法与通常使用的固定分块方式的编码方法相比，可以大     

一种基于TIN的大规模地形实时可视化算法研究

在地形可视化领域中,如何对大规模地形的数据进行处理和可视化一直是一个关键问题.本文提出一种有效的实现方法.采用平均分割方法对大规模地形数据进行分割.其中重点解决地形块简化时相邻地形块问的边界处理问题;通过基于半边收缩和顶点分裂操作获得多分辨率TIN模型,并改进顶点分裂操作方法.实验结果表明,采用本方法可以实时生成大规模地形,提高了地形漫游的效率与可视化效果.     

海量地形数据实时可视化算法

针对海量地形数据实时可视化问题，提出了一种瓦片金字塔模型和线性四叉树索引相结合的地形数据管理模式．利用视景体裁剪和基于分辨率测试的目标瓦片快速搜索算法实现了地形数据的实时装载，采用基于动态二叉树构网的方法实现了地形数据的实时绘制．实验表明，文中方法能够实现基于当前PC机的真实感海量地形数据实时显示与交互操作．     

一个交互实时的多分辨率地形绘制系统

本文设计并实现了一个交互实时的多分辨率地形绘制系统，介绍了系统的组成、实时优化方法的以及地形几何和纹理数据表示和管理方法，并通过一实例对地形绘制系统的性能进行了评价。从绘制结果看，系统对地形进行实时优化时折衷考虑了国象绘制质量和绘制速率，在图象质量没有有明显退化的情况下极大地改善了地形绘制的性能。     

遗传规划算法在化合物设计、筛选研究中的应用

采用计算机科学中新兴的遗传规划算法思想，结合化学物质的本质特点，运用进化操作来实现化合物的合成设计和筛选。文中针对算法运用讨论了函数集、终止集问题，通过计算元素组成的字符串的化合价的结果来确定适应度函数，既符合化学学科的本质规律，又满足了算法的要求。通过复制、交换和突变操作，经过多代次的进化终止，取得了满意的结果。文章还针对其实用性，从化学本质出发，提出了建议和研究方向。可以说本文是遗传规划在化学化合物合成筛选中运用的成功探索，同时也为进一步研究打下了坚实的基础。     

Promotion and prevention orientations in the choice to attend lectures or watch them online

When presented with the option to use a new instructional technology, students often face an approach–avoidance conflict. This study explored promotion and prevention orientations, concepts linked to approach and avoidance in Higgins's regulatory focus theory, in the choice to attend lectures or watch them online. Openness, a core disposition in the Big Five Model of personality, and positive attitudes towards the utility of the Internet, reflect promotion orientations that are potentially related to the choice to watch lectures online. By contrast, neuroticism, another core disposition in the Big Five Model, and anxiety about the Internet as a computer technology, reflect a prevention orientation that is potentially related to the choice of attending lectures in class. The results illustrate that both promotion and prevention are at work in the choice to attend lectures or to watch them online. Neuroticism and anxiety about the Internet as a computer technology were related to the choice to attend lectures in class, whereas the perceived utility of the Internet was related to the choice to watch lectures online. Instructional mode choice was not related to examination performance, suggesting that the choice to attend lectures or watch them online has more to do with individual differences in promotion and prevention orientations than with pedagogical characteristics that impact learning.     

集群负载均衡--CSM的实现

对于现在的互联网络通信状况,负载均衡显示其越来越多的重要性,通常实现负载均衡是使用软件并结合相应的算法,该文所描述的是利用Cisco公司的CSM模块来实现安全可靠的负载均衡,CSM模块将客户机的请求分发到不同的虚拟服务器,配合Cisco MSFC模块并合理地进行DNS的配置,实现网络服务的负载均衡。简要介绍了CSM模块的工作原理,如何配置DNS,如何设置虚拟主服务器,以及如何对系统CSM模块进行设置做了描述。     

海量大气颗粒物成分分析系统

2011年以来, 我国多地出现了雾霾天气, 对大气颗粒成分分析有助于人们了解雾霾形成的原因, 制订有效的应对措施. 本文的主要目的是对于大气颗粒物成分进行命名. 传统颗粒物的命名是在经验的基础上, 对颗粒进行逐个的命名. 若将该过程自动化, 难点有两个: 数据规模太大、人工经验难以量化. 本文使用数据挖掘的工具, 首先进行了一次聚类分析, 降低了数据规模. 为了解决人工经验难以量化的问题, 使用逻辑回归分类算法, 并进行了调优, 使正确率达到了业务处理的要求.     

Affinity-Based Network Interfaces for Efficient Communication on Multicore Architectures

Improving the network interface performance is needed by the demand of applications with high communication requirements (for example, some multimedia, real-time, and high-performance computing applications), and the availability of network links providing multiple gigabits per second bandwidths that could require many processor cycles for communication tasks. Multicore architectures, the current trend in the microprocessor development to cope with the difficulties to further increase clock frequencies and microarchitecture efficiencies, provide new opportunities to exploit the parallelism available in the nodes for designing efficient communication architectures. Nevertheless, although present OS network stacks include multiple threads that make it possible to execute network tasks concurrently in the kernel, the implementations of packet-based or connection-based parallelism are not trivial as they have to take into account issues related with the cost of synchronization in the access to shared resources and the efficient use of caches. Therefore, a common trend in many recent researches on this topic is to assign network interrupts and the corresponding protocol and network application processing to the same core, as with this affinity scheduling it would be possible to reduce the contention for shared resources and the cache misses. In this paper we propose and analyze several configurations to distribute the network interface among the different cores available in the server. These alternatives have been devised according to the affinity of the corresponding communication tasks with the location (proximity to the memories where the different data structures are stored) and characteristics of the processing core. As this approach uses several cores to accelerate the communication path of a given connection, it can be seen as complementary to those that consider several cores to simultaneously process packets belonging to either the same or different connections. Message passing interface (MPI) workloads and dynamic web servers have been considered as applications to evaluate and compare the communication performance of these alternatives. In our experiments, performed by full-system simulation, improvements of up to 35% in the throughput and up to 23% in the latency have been observed in MPI workloads, and up to 100% in the throughput, up to 500% in the response time, and up to 82% in the requests attended per second have been measured in dynamic web servers.     

A Manifesto for Agent Technology: Towards Next Generation Computing

The European Commission's eEurope initiative aims to bring every citizen, home, school, business and administration online to create a digitally literate Europe. The value lies not in the objective itself, but in its ability to facilitate the advance of Europe into new ways of living and working. Just as in the first literacy revolution, our lives will change in ways never imagined. The vision of eEurope is underpinned by a technological infrastructure that is now taken for granted. Yet it provides us with the ability to pioneer radical new ways of doing business, of undertaking science, and, of managing our everyday activities. Key to this step change is the development of appropriate mechanisms to automate and improve existing tasks, to anticipate desired actions on our behalf (as human users) and to undertake them, while at the same time enabling us to stay involved and retain as much control as required. For many, these mechanisms are now being realised by agent technologies, which are already providing dramatic and sustained benefits in several business and industry domains, including B2B exchanges, supply chain management, car manufacturing, and so on. While there are many real successes of agent technologies to report, there is still much to be done in research and development for the full benefits to be achieved. This is especially true in the context of environments of pervasive computing devices that are envisaged in coming years. This paper describes the current state-of-the-art of agent technologies and identifies trends and challenges that will need to be addressed over the next 10 years to progress the field and realise the benefits. It offers a roadmap that is the result of discussions among participants from over 150 organisations including universities, research institutions, large multinational corporations and smaller IT start-up companies. The roadmap identifies successes and challenges, and points to future possibilities and demands; agent technologies are fundamental to the realisation of next generation computing.     

我国企业管理信息化建设的探究

企业信息化管理指的就是企业将自身生产过程中的业务流程、生产过程、客户交换、事物处理等工作进行电子化和数字化的处理,并且应用先进的信息系统网络加工组合数据信息,进而得到新的信息资源,提供给企业各个部门的人员参考和使用,最终设计出最好的解决方案,对企业的资源进行充分的利用。也就是促使企业更好的适应和顺应市场的发展,最大化企业的利益。文章主要分析和研究了我国企业的信息化建设,并对信息化建设中的问题进行了分析,最后提出了解决的对策,为我国企业管理的信息化建设提供了一定的参考依据。     

Requirements model driven adaption and evolution of Internetware

Today’s software systems need to support complex business operations and processes.The development of the web-based software systems has been pushing up the limits of traditional software engineering methodologies and technologies as they are required to be used and updated almost real-time,so that users can interact and share the same applications over the internet as needed.These applications have to adapt quickly to the diversified and dynamic changing requirements in the physical,technological,economical and social environments.As a consequence,we are expecting a major paradigm shift in software engineering to reflect such changes in computing environment in order to better address the fundamental needs of organisations in this new era.Existing software technologies,such as model driven development,business process engineering,online(re-)configuration,composition and adaptation of managerial functionalities are being repurposed to reduce the time taken for software development by reusing software codes.The ability to dynamically combine contents from numerous web sites and local resources,and the ability to instantly publish services worldwide have opened up entirely new possibilities for software development.In retrospect to the ten years applied research on Internetware,we have witnessed such a paradigm shift,which brings about many changes to the developmental experience of conventional web applications.Several related technologies,such as cloud computing,service computing,cyber-physical systems and social computing,have converged to address this emerging issue with emphasis on different aspects.In this paper,we first outline the requirements that the Internetware software paradigm should meet to excel at web application adaptation;we then propose a requirement model driven method for adaptive and evolutionary applications;and we report our experiences and case studies of applying it to an enterprise information system.Our goal is to provide high-level guidelines to researchers and practitioners to meet the challenges of building adaptive industrial-strength applications with the spectrum of processes,techniques and facilities provided within the Internetware paradigm.     

The reality of medical work: The case for a new perspective on telemedicine

This paper considers the nature of medical work and how new telemedicine technologies can be developed to support that work. Telemedicine developers attempt to increase communication and collaboration between medical practitioners and between patients and medics, with the goal being to make medical care and information more easily accessible. However, the focus of telemedicine systems appears to have so far been technology centred, and the work they are trying to support is often ignored. We argue that to develop appropriate telemedicine technologies, it is important to understand the nature of medical work, and to examine the manner in which medical practiceactually occurs. Only then will we be in a position to design appropriate telemedicine technologies to support these activities. Unless designers have an insight into the work itself, new technologies will continue to fail to support what telemedicine effectively aims to promote — collaboration and access to distributed knowledge.     

The electrical distribution network planning problem

In this paper we are dealing with the electrical distribution network planning problem where a network configuration has to be specified in order to meet demand, to satisfy the operating constraints, and to minimize investment, operating, and power–loss costs. The iterative procedure includes several heuristic algorithms to generate a radial network, to choose a set of open feeders to meet the reliability constraint, and to solve the reconfiguration problem in order to reduce the power–loss costs. Furthermore, in order to compare the reliability of potential solutions, a predictive reliability assessment measure is established.