基于Volterra级数的RLS自适应算法的混沌时间序列预测

根据混沌序列产生的确定性和非线性机制,基于Volterra级数和RLS算法,提出了一种少参数二阶非线性滤波算法用于混沌时间序列的自适应预测。仿真结果表明,这种非线性自适应滤波器能有效地预测一些超混沌序列,而且该滤波器的一步均方误差性能明显高于其他基于Volterra级数的NLMS算法,表明该算法具有良好的收敛性能。     

大数据背景下的情报分析

大数据时代的到来,将数据和信息分析提升到前所未有的高度。探讨了大数据背景下情报分析面临的新环境：数据流分析倍受关注、信息粒度更为细小、情报问题动态复杂、分析技术丰富多样;进一步提出情报分析的发展趋势：注重情境研究,开展协同分析,分析实时数据;最后指出在新环境下情报分析需要注意的两个问题：大数据的陷阱和待构建的指标。     

基于FPGA的Ethernet Powerlink技术的实现

为满足工业自动化控制系统数据采集传输的实时要求,以Cyclone系列的EPCAOF484为核心控制芯片,ENC28J60为网络接口芯片,实现了开源以太网协议Powerlink。利用Wireshark工具进行测试,实验结果表明,这种利用FPGA实现Powerlink的方法具有确定性好、实时性强的优点。     

单心动周期三维超声评价心梗后的左心收缩功能及同步性

目的应用单心动周期三维超声评价心肌梗塞患者的左心收缩功能及同步性,以便方便、快捷、准确地识别心肌梗塞的节段。方法正常组30例,心梗组27例,先用二维Simpson’S法测定左室整体EF值,再用单心动周期三维超声测左室整体EF值、SDll7值、DDI17值及各节段的容积时间曲线、EF值曲线。比较各组间参数的差异及相关性。结果正常组2D法和4D法测得的左室射血分数无明显差异。心梗组2D法和4D法测得的左室射血分数差异显著。正常组和心梗组的SD117值差异显著,DDI17值在两组间无明显差异。结论单心动周期三维超声心动图能全面真实地显示左室的几何形态,本研究显示心梗后左室整体EF值下降,17节段容积一时间曲线同步性差,曲线图直观明了,可以方便、快捷、准确地识别心肌梗塞的节段。     

A Survey of the Reference Sources for Holistic Medicine

Holistic medicine and therapeutic systems are increasingly popular health care alternatives. Reference librarians, when asked about subjects pertaining to the vast field of holistic health, have found the bibliographic resources to be obscure, confusing, and inconsistent. The first two sections of this article discuss the subject access that is provided by Library of Congress and National Library of Medicine subject headings. In the final section there is an annotated bibliography of the chief reference sources for the field. Reference librarians are encouraged to work through the difficulties of finding answers in this field and to treat such queries as typical consumer health care questions.     

XML在校园异构数据库同步系统中的应用研究

通过研究XML和异构数据库相关知识提出了一种针对校园异构系统的数据同步方法,介绍该系统的体系结构和各部分的功能,给出系统的实现。     

网上实时交互教学引导学生探究式学习方法探索

如何在网上实时交互教学中引导学生探究式学习值得研究。在教学策略上应从交互主题设计、交互问题设置、交互氛围创设、交互过程调控四方面加以改进。交互主题设计要以课程教学目标为主要依据、适应学生的需求及兴趣、贴近社会生活和学生生活。交互问题设置应注意启发性、层次性、开放性。交互氛围创设要多用陈述性语言,少用评价性语言,与学生平等相处,恰当使用富有感情色彩的语言,加强师生互动。交互过程中要根据实时交流的情况灵活调整,及时做好过程调控。     

彩色多普勒超声对异位妊娠破裂的诊断及鉴别诊断

目的讨论实时彩色多普勒超声对异位妊娠破裂的诊断及鉴别诊断。方法采用PHILIPSEnVisorC彩色多普勒超声诊断仪对15例疑似异位妊娠破裂患者的声像图进行分析与鉴别诊断。结果15例妇产科疑似异位妊娠破裂患者,手术后经病理科证实12例为异位妊娠破裂,3例误诊。结论实时超声对异位妊娠破裂有很高的诊断和鉴别诊断价值。     

用Proteus实现51单片机的动态仿真

Proteus是一款功能强大的EDA软件,所配备的仿真元件库使其在电子设备的动态仿真方面具有其他仿真软件不可比拟的优越性;丰富的虚拟仪表箱也为仿真测试提供了方便。文章以89C51单片机为例具体分析了Proteus在对微处理器软、硬件仿真方面的独到之处,并通过实例展示其广阔的应用前景。     

Introducing Real-Time AVHRR-APT Satellite Imagery in the Classroom Environment

A low-cost (US$350) satellite receiving station was assembled and operated within a classroom environment in Gainesville (Florida) on October 2001 for acquiring satellite data directly from the Advanced Very High Resolution Radiometer (AVHRR) satellites. The simplicity of the satellite signal makes this source of real-time satellite data readily accessible to the K-16 educational community. The educational strategy of this program sought to achieve pedagogical effectiveness within the sciences, mathematics, and technology through the cultivation of applied, critical, and analytical skills. The applied hands-on laboratory and lecture experiences aimed at enabling students to visualize and integrate the various concepts presented in the classroom. The characteristics of the satellite data provide students and educators with live visible and infrared images that allow for the visualization and exploration of dynamic scientific concepts, making the AHVRR-APT system a suitable educational tool for complementing the K-16 curricula. This educational experience relied on inexpensive radio equipment for accessing satellite data through the exploration of modern space technology. When compared to Internet-based sources of AVHRR data, the virtual nature of Internet portals cannot provide students with a live satellite data acquisition experience, such as that available through a classroom-based AVHRR-APT satellite receiving station.