Morphological evolution of primary TiC carbide in laser clad TiC reinforced FeAl intermetallic composite coating

1　INTRODUCTIONIronaluminumbasedonFeAlintermetallicalloywasexpectedtobeanimportantandpotentialhightemperaturematerial,becauseitsgoodresistancetooxidationandcorrosion ,lowdensityandhightem peraturemelting point[12 ] .However ,theintrinsicpropertiesofFeAlintermetallicalloy ,suchaslowductilityandlowfracturestrength ,limiteditsindus trialapplications .Howtoimprovemechanicalproper tiesofFeAlintermetallicalloyandexpanditsindus trialapplicationrealmwasanimportantresearchas pectformaterialworke…     

基于逻辑回归模型的木片和树皮的图像识别

为了提高木片生物能的利用率,需要除去木片中的树皮杂质。识别木片和树皮的图像对于实现二者分离具有重要作用。提出一种基于逻辑回归模型来对木片和树皮进行图像识别的算法。算法流程包括计算各种可以描述木片和树皮纹理的参数,利用SAS统计分析出最佳参数,将最佳参数计算所得的样本数据用于SAS LOGISTIC过程得到预测方程,再将预测方程用于逻辑回归模型来实现木片和树皮的图像识别。通过实验可知,最佳参数为灰度方差,该图像识别算法的正确率能达到97.4%。     

Toward Better Understanding of Task Difficulty during Physicians’ Interaction with Electronic Health Record System (EHRs)

ABSTRACT

The goal of this study was to assess the relationship of task difficulty and mental effort with performance during physicians’ interaction with electronic health records (EHRs). A total of 38 physicians were asked to identify abnormal results and take follow-up action to “close the loop” on care delivery. Task difficulty was quantified via task-flow strategies and computer mouse-click patterns. Mental effort was quantified using eye movements based on changes in pupillary dilations (task evoked pupillary response or TEPR) and blink rate. Performance was quantified based on commission errors (error vs. no-error). Results indicated that physicians had different task-flow strategies; however, with improved awareness of the patient status, they exhibited an optimal task-flow strategy. Overall, performance was related to task-flow strategies, computer mouse-click patterns, and blink rate, indicating that physicians had lower task-difficulty and experienced lower mental effort with improved awareness of patient follow-up status. This is an important finding demonstrating that task-flows are a dominant predictor of physician performance when comparing between EHR designs. On the contrary, mouse-click patterns and blink rate are both useful predictors of physician performance when assessment was done within an EHR.     

生态型雨水排水系统在上海的应用及发展

阐述了生态型雨水排水产生的背景,以典型案例方式介绍了国外该领域的实用经验和有效方法。着重介绍生态型雨水排水方式在上海的应用实例和发展方向,主要包括学科合作、科研标准、法律约束、规划目标、经济调控等多方面。     

安钢SAP预留系统的开发与应用

本文简述了安钢信息化建设概况,介绍了安钢信息化建设中开发SAP预留系统的设计流程,阐述了预留系统实现的功能.     

基于Packet Tracer的Multiuser扩展构建分布式网络模拟实验环境

Packet Tracer广泛应用于计算机网络课程的教学实践中.不同于传统的单机模拟,利用Packet Tracer的Multiuser扩展构建分布式的网络模拟实验环境,可解决单机模拟在规模、性能等方面的限制.该实验环境可用于加强教学互动,帮助学生掌握概念和操作方法,提高教学效果.     

基于UML可适应的教学考评系统分析与设计

该文给出了UML的概念与要点,应用UML对教学考评系统进行了建模。给出了系统的用例模型、整体结构模型、静态模型、动态模型,并分析了模型对教学考评变化的可适应性。     

矩阵特征值估计的粒子群优化算法

利用Gersehgorin圆盘定理与矩阵特征值的性质,将特征值的求解问题转化为最优化问题.借助粒子群优化算法与二分法思想,精确地估计了实(复)方矩阵的全体特征值,并与Matlab软件中基于QR算法设计的特征值求解函数eig的计算结果作对比,绝对误差达到10-7数量级以上.同时,也解决了特征值分离度的估计问题.     

基于入侵攻击的生存性需求分析方法研究

入侵攻击是网络信息系统面临的主要威胁.根据以往记录的攻击数据,总结攻击发生的规律和特征,定义入侵情景,通过入侵情景的不同组元描述入侵攻击的特征.按照生存性特性定义生存性需求,明确生存性需求分析的目标.利用使用/入侵用例图与入侵攻击特征一生存性需求对照表相结合的方法,获取生存,陛需求,制订生存性服务策略,提高了分析结果的科学性和可读性.