Comment on Greenwood (2007): Solving the puzzle of structure/function relations in the aging brain?

Neuroimaging experiments have shown that prefrontal regions of the brain, which have the most age-related volume loss, are also the regions most likely to be more active in older adults than in younger adults. In an attempt to solve this puzzle, P. M. Greenwood (see record 2007-15625-001) has proposed a cascade that flows from age-related atrophy in the brain to changed processing strategies that result in plastic changes in regions adjacent and contralateral to the atrophic areas, culminating in greater functional activity. This hypothesis should stimulate research into these mechanisms and hopefully will ultimately inform researchers' ability to rehabilitate cognitive disorders in the elderly. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

融合动态层次聚类和邻域区间重组的蚁群算法

针对蚁群算法搜索速度过慢以及解质量不足等问题,提出一种融合动态层次聚类和邻域区间重组的蚁群算法。在初始阶段,调整层次聚类阈值并按照类间距离最小合并的原则迭代至目标簇集,根据预合并系数进行簇间合并,通过蚁群系统得到小类路径并断开重组以加快算法整体收敛速度;接着使用蚁群系统对解空间进行优化,同时并行处理簇集与簇集邻域区间扩散重组,增加解的多样性,进一步固定迭代次数进行比较,若邻域区间重组解质量优于当前优化解则进行推荐处理,提高解的精度;当算法停滞时,引入调整因子降低各路径信息素之间差异以增强蚂蚁搜索能力,有助于算法跳出局部最优。实验结果表明,在面对大规模问题时,算法的精度在3%左右,该方法相比传统方法可以有效提高解的精度和收敛速度。     

顾及高效可视化的 CAD模型数据重组织方法 *

CAD模型造型精度高 ,渲染效果逼真 ,被广泛应用于虚拟现实、实时仿真以及三维地理信息系统等三维可视化中 ,但是其几何模型数据复杂 ,图像数据量大 ,也导致可视化效率低下。为此 ,提出了一种 CAD模型数据重组织方法 ,旨在解决当前可视化应用集成 CAD模型数据效率低下的问题。采用预先计算可视化信息 ,高度紧凑组织数据 ,顾及图形软硬件特性等一系列策略 ,实现 CAD模型数据的高效可视化功能。其中 ,几何模型绘制和图像纹理生成效率均提高了 10倍以上。该方法被成功应用于香港志莲净苑佛寺虚拟旅游演示项目中。     

基于融合程序控制流的动态分解算法

计算和数据分解是分布主存系统中并行编译的关键,在并行优化编译器的并行识别过程中,许多串行代码无法找到全局一致的分解结果。针对这种情况,该文提出一种融合程序控制流的动态分解算法,增加控制流对分解的影响,使生成的分解结果更适合于后端自动生成的并行代码。实验分析结果表明了该方法的有效性。     

检索网页中人机匹配设计原则与流程

本文以信息系统的设计原则作为原型,结合用户的兴趣得到检索网页的初步模型,再用人的认知行为能力来对现有的网页进行重组改善,实现一个动态的检索网页的改善更新。从而得到能最大化满足用户需求的检索网页。     

Sensory-motor enhancement in a virtual therapeutic environment

The sensory-motor skills of persons with neuromuscular disabilities have been shown to be enhanced by intensive and repetitive therapeutic interventions. This paper describes a form of low immersion virtual reality and a prototype, open source system that allow a user with significant physical disability to actively interact with computer-generated objects whose behaviors promote a game-like interaction. Unlike fully immersive and haptic virtual reality, this approach frees the user from head-mounted displays and gloves. It extracts the user’s real-time silhouette from the output of a remote video camera and uses that two-dimensional outline to interact with graphical objects on screen. In contrast to video games that have been modified with specialized interfaces, this virtual interaction system promotes the repetitive use of goal directed movements of the arms and body, which are essential to promote cortical reorganization, as well as discourage unwanted changes in muscle tissue that result in contracture. A prototype system demonstrates the potential of low immersion technology to motivate users and encourage participation in therapy. It also offers the potential of accommodating the sensory-motor skills of individuals with very significant impairment. The behaviors of the computer-generated graphics can be altered to allow use by those with very limited range of motion and/or motor control. These behaviors can be adjusted to provide a continuing challenge as the user’s skills improve. This prototype is described in terms of functional capabilities that include a silhouette extraction from a video image, and generation of graphical objects that interact with the silhouette. The work is extended with a discussion of a more sophisticated region of interest detection algorithm that can select specific parts of the body.     

化工可持续发展的思考

介绍了社会可持续发展的概念和重要性,及实施生态化工的一些具体途径:化学过程及工艺的绿色化,可再生资源的开发及废弃资源的综合利用,发展纳米科技及微化工技术,强化过程及化工集成,建设生态工业园区,并推进化工信息化。     

CAPP技术与机械制造自动化

探讨CAPP技术的内涵与外延,研究其与机械制造及自动化技术的关系,提出相关技术整合的思路与措施,在机械制造自动化课程群建设中进行改革与实践,有效地减少了CAPP技术在相关课程间的重复与脱漏,使相关教学实验资源得以充分利用,收到了显著的整改效果。     

支持QoS的覆盖组播分布式动态路由研究

研究了带度和延时约束的覆盖组播动态路由问题,提出了动态适应性覆盖组播路由协议OMP,给出了一个基于分布式触发重组的组播路由算法——动态覆盖组播路由算法(DDCOMR),最后对该算法的复杂度进行了推证,对协议和算法的有效性进行了网络模拟。