地形三维可视化的实现与应用

文中讨论了地形三维可视化的原理，详细介绍了高级编程语言与OpenGL结合开发环境下的地形三维可视化的计算机实现过程。在此基础之上，讨论了基于GRID DEM的应用分析功能的实现,包括等高线、坡度图、通视分析以及淹没分析。为三维地形可视化的实施提出了有效的方案。     

An infrastructure to support cooperation of knowledge-level agents on the semantic Grid

Can a Knowledge-Level layer be located in the Semantic Grid infrastructure? Is it possible to design an Agent Communication Language (ACL) which enables Knowledge-Level agents to cooperate in a geographically distributed Semantic Grid despite nodes’ failures or malfunctions? This paper tries to address the above Semantic Grid challenges presenting an agent-based Open Service Architecture which integrates geographically distributed agents in a Semantic Grid. The architecture is well integrated with standard Internet components and technologies and supports communication among Knowledge-Level agents. The role of agents is to retrieve, execute and compose available services providing more sophisticated instances of them. Inter-agent communication is realized by exploiting an advanced Agent Communication Language which supports a fault-tolerant anonymous interaction protocol and satisfies a set of well defined Knowledge-Level programming requirements. Here, we present the design of the architecture and of the Agent Communication Language as well as their implementation. The architecture is evaluated by means of several case studies which highlight the main feature of our proposal. The main advantage of our approach is to demonstrate that different issues, such as high level inter-agent communication and fault tolerance, can be successfully integrated in Grid infrastructures which provide Web Services maintaining a clean design of the architecture and a Knowledge-Level characterization.     

A PROTOTYPE GRID FRAMEWORK FOR THE CHEMICAL PROCESS INDUSTRIES

This article presents a GRID framework for distributed computations in the chemical process industries. We advocate a generic agent-based GRID environment in which chemical processes can be represented, simulated, and optimized as a set of autonomous, collaborative software agents. The framework features numerous advantages in terms of scalability, software reuse, security, and distributed resource discovery and utilization. It is a novel example of how advanced distributed techniques and paradigms can be elegantly applied in the area of chemical engineering to support distributed computations and discovery functions in chemical process engineering. A prototype implementation of the proposed framework for chemical process design is presented to illustrate the concepts.     

GRID转换为TIN的选点算法

GRID和TIN是GIS的两种重要的数据表示方式。该文设计了一种新的GRID转换为TIN的过程中点的选取算法。该算法根据Delaunay三角形的特点，分别从平面、横向、纵向3个方面进行判断选取适当的点。在判断过程中，采用“回溯”的方法，尽量减少生成TIN的点，通过实验验证，与ARC/INFO系统相比，对同样的GRID格式文件转换为TIN格式时选取的点更少，从而大大减少了数据冗余。     

Performance of computationally intensive parameter sweep applications on Internet‐based Grids of computers: the mapping of molecular potential energy hypersurfaces

This work focuses on the use of computational Grids for processing the large set of jobs arising in parameter sweep applications. In particular, we tackle the mapping of molecular potential energy hypersurfaces. For computationally intensive parameter sweep problems, performance models are developed to compare the parallel computation in a multiprocessor system with the computation on an Internet‐based Grid of computers. We find that the relative performance of the Grid approach increases with the number of processors, being independent of the number of jobs. The experimental data, obtained using electronic structure calculations, fit the proposed performance expressions accurately. To automate the mapping of potential energy hypersurfaces, an application based on GRID superscalar is developed. It is tested on the prototypical case of the internal dynamics of acetone. Copyright © 2006 John Wiley & Sons, Ltd.     

一种网格环境下的软件配置管理系统

为能够让异地的开发人员充分利用稀有的网格资源环境来协同开发、调试代码,我们提出了网格环境下的软件配置管理系统。本文简要介绍了该系统的功能、结构框架,并详细阐述了该系统的核心技术和关键机制。     

LIDA ID混合金属氧化物阳极在储罐阴极保护中的应用

网状阳极是储罐阴极保护的一种有效的方法,具有一些其它保护方法所没有的优点,而且保护效果十分优异,目前国内应用较多的为美国TELPRO及CORRPRO公司生产的RIBBON阳极.本文着重介绍意大利De Nora公司生产的LIDA阳极在储罐阴极保护中的应用.     

城区电网调度危险点分析及应对措施

北京城区电网具有结构复杂,10kV接线方式多样化,负荷密度大等特点。针对城区电网自身的特点,就城区电网调度中存在的危险点进行分析,并提出了应对措施。     

基于地理信息服务网格的环境教育资源共享研究

环境教育资源异地、异构特征是实现资源共享的主要因素,鉴于环境教育资源与地理位置的联系密不可分,基于地理信息服务网格的共享模式是当前技术环境下实现环境教育资源共享的有效途径。以地理信息为框架,探索了新型的环境教育资源组织和管理方案,对数据集成方案以及索引、缓存策略进行深入研究,并构建了环境教育资源网格服务,通过实验测试表明系统具有较快的响应速度,能够满足环境教育资源共享需求,利用缓存技术能够有效提升系统服务性能。     

Radiobiological and Treatment-Related Aspects of Spatially Fractionated Radiotherapy

The continuously evolving field of radiotherapy aims to devise and implement techniques that allow for greater tumour control and better sparing of critical organs. Investigations into the complexity of tumour radiobiology confirmed the high heterogeneity of tumours as being responsible for the often poor treatment outcome. Hypoxic subvolumes, a subpopulation of cancer stem cells, as well as the inherent or acquired radioresistance define tumour aggressiveness and metastatic potential, which remain a therapeutic challenge. Non-conventional irradiation techniques, such as spatially fractionated radiotherapy, have been developed to tackle some of these challenges and to offer a high therapeutic index when treating radioresistant tumours. The goal of this article was to highlight the current knowledge on the molecular and radiobiological mechanisms behind spatially fractionated radiotherapy and to present the up-to-date preclinical and clinical evidence towards the therapeutic potential of this technique involving both photon and proton beams.