Computing surfaces invariant under subdivision

In this paper, we propose a general subdivision algorithm for generating surfaces. The algorithm has as motivation our earlier work on the design of free form curves where similar ideas were investigated. Here we describe some properties of uniform refinement algorithms for surface generation. A detail analysis of their properties will be given later by one of us.     

虚拟化安全建设研究

首先分析了虚拟化给传统信息安全带来的挑战,然后分别从边界防护、病毒防护、补丁管理以及虚拟化基础设施保护四个方面,阐述了在虚拟化环境下如何进行安全防护。     

防止过拟合的属性约简

近年来,机器学习的过拟合问题备受关注,尤其在属性约简中。为解决这一难题,提出一种融合集成策略和去除操作的算法。首先将训练模型数据平分为◢M份;然后将其中M◣-1份采用集成策略进行潜在约简计算;最后将剩余的一份进行提前测试,一旦发生过拟合则将刚加入的属性从潜在约简集中去除。利用提前测试潜在属性约简的方法来防止过拟合现象的发生,几组UCI数据的实验结果说明了新算法的有效性,同时为丰富和发展属性约简提供了一种新的方向。     

TURBULENT FLOW IN A PIPE WITH INTERMITTENT ROUGH PATCHES: AN ANALOGUE OF ANNULAR TWO-PHASE FLOW

The response of turbulent pipe flow to sudden changes in wall roughness and flow cross-sectional area has been studied experimentally and numerically. Changes typical of those encountered by the gas phase in annular gas-liquid flow have been considered. The results show that the flow field and the pressure field can be significantly distorted at these transitions. Good agreement has been obtained between the measured results and those calculated using the Harwell-FLOW3D computational fluid dynamics (CFD) code.     

Development of an Asymmetric Hydrophobic/Hydrophilic Ultrathin Graphene Oxide Membrane as Actuator and Conformable Patch for Heart Repair

A conductive engineered cardiac patch (ECP) can reconstruct the biomimetic regenerative microenvironment of an infarcted myocardium. Direct ink writing (DIW) and 3D printing can produce an ECP with precisely controlled microarchitectures. However, developing a printed ECP with high conductivity and flexibility for gapless attachment to conform to epicardial geometry remains a challenge. Herein, an asymmetrical DIW hydrophobic/hydrophilic membrane using heat-processed graphene oxide (GO) ink is developed. The “Masked spin coating” method is also developed that leads to a microscale GO (hydrophilic)/reduced GO (rGO, hydrophobic) physiological sensor, as well as a macroscale moisture-driven GO/rGO actuator. Depositing mussel-inspired polydopamine (PDA) coating on the one side of the DIW rGO , the ultrathin (approximately 500 nm) PDA-rGO (hydrophilic)/rGO (hydrophobic) microlattice (DrGOM) ECP is bestowed with the flexibility and moisture-responsive actuation that allows gapless attachment to the curved surface of the epicardium. Conformable DrGOM exhibits a promising therapeutic effect on rats' infarcted hearts through conductive microenvironment reconstruction and improved neovascularization.     

Multiple Comparisons in Induction Algorithms

A single mechanism is responsible for three pathologies of induction algorithms: attribute selection errors, overfitting, and oversearching. In each pathology, induction algorithms compare multiple items based on scores from an evaluation function and select the item with the maximum score. We call this a multiple comparison procedure (MCP). We analyze the statistical properties of MCPs and show how failure to adjust for these properties leads to the pathologies. We also discuss approaches that can control pathological behavior, including Bonferroni adjustment, randomization testing, and cross-validation.     

基于WSUS的自动更新在气象局域网内的应用

保障气象网络安全是气象业务正常开展的首要前提,而及时更新操作系统补丁,是弥补系统漏洞、防范攻击的必要手段。本文叙述了微软补丁更新方案 WSUS 的概念和优势,并结合气象业务网络的实际,阐述了 WSUS 在服务器端和客户端的具体部署方法,并分析了潜在的安全风险。     

居住区绿地规划设计的探讨

居住区绿地规划不仅要为居民创造卫生、安静、舒适的居住环境．也要为居民创造一个满足他们特定精神需要的居住环境。目前，居住区绿地规划设计存在许多问题．针对提出的问题．分析了产生的原因，提出了对策和建议。     

决策树算法及其常见问题的解决

决策树这种数据挖掘技术是目前最有影响和使用最多的数据挖掘技术之一,生成决策树的算法也比较多,但是在这些生成决策树的算法中都需要解决两个问题——数据过分近似和测试属性的选择。     

基于JavaEE架构的电网企业漏洞补丁智能化管理系统设计

本文基于JavaEE架构设计了电网企业漏洞补丁智能化管理系统.首先分析系统业务部署框架、应用框架、数据框架、技术框架;其次设计系统整体结构;再次进行经验库与补丁库建设;最后详细设计系统功能.研究表明,此系统基于信息化技术途径优化漏洞补丁检索业务及其处理能力,提高了业务人员工作效率与水平;且促使漏洞补丁检索人员快速有效发...