人机交互中的声源定位与增强方法

基于人机交互的实际应用场景,提出了一种交互目标声源三维定位与语音增强算法。该算法首先在广义相关法的基础上提出一种声达时延差的估计方法,通过由6个麦克风构成的平行均匀线阵接收模型,实现对目标声源的三维定位;然后在交互目标声源定位的基础上,通过调整时延波束叠加的权值,实现对目标语音的增强。仿真实验结果表明,文中提出的算法能够准确定位目标声源并对目标语音进行有效增强。在信噪比大于1.5 dB 的环境中,该算法可使目标声源达到98%以上定位精度,5 dB 以上信噪比改善,同时算法运算量小且易于硬件实现。     

室内装修的环境污染及其预防探讨

介绍了室内环境污染的来源、装修材料的污染性,探讨了造成室内环境污染的因素,并在此基础上提出了一系列新型环保节能的建筑材料和室内装修污染的防治措施。     

基于PCI和RS-422的隔离多路信号源与上位机通信的设计与实现

设计了基于PCI总线和RS-422的隔离多路信号源,PCI9054搭建起PCI接口电路,采用分片、分帧的乒乓数据传输结构完成数据的传输;该数据传输方式具有通用性强、操作灵活、升级和扩展能力强等优点;重点分析了上位机与测试台的PCI通信协议,乒乓数据结构及测试台内部板卡间的RS-422通信方式,并调试其与上位机通信;实验测试证明,与传统方式相比,数据准确性和稳定性明显提高,能以86MBps的速率进行数据传输。     

噪声系数的测量方法研究

该文介绍了三种测量噪声系数的方法：增益法,Y因子法和冷源法。重点介绍了当我们做精确测量时Y因子法的不足和冷源法的突破以及给出了这两种方法的实际测试例子。     

On the use of open-source firewalls in ICS/SCADA systems

ABSTRACT

Firewalls are one of the most widely used security devices to protect a communications network. They help secure it by blocking unwanted traffic from entering or leaving the protected network. Several commercial vendors have extended their firewall capabilities to support SCADA protocols or designed SCADA-specific firewalls. Although open-source firewalls are used successfully in IT networks, their use in SCADA networks has not been properly investigated. In this research we investigate the major open-source firewalls for their use in SCADA networks and identify Linux iptables’ potential as an effective SCADA firewall. Iptables is a powerful open-source firewall solution available as part of most Linux distributions in use today. In general, use of iptables as a network-level firewall for SCADA systems has been limited to basic port and host filtering, without further inspection of control messages. We propose and demonstrate a novel methodology to use iptables as an effective firewall for SCADA systems. This is achieved by utilizing advanced iptables features that allow for dynamic inspection of packet data. It is noteworthy to mention that the proposed solution does not require any modification to the netfilter/iptables framework, making it possible to turn a Linux system into an effective SCADA firewall. The approach has been tested by defining filtering rules for the Modbus TCP protocol and validating its ability to defend against various attacks on the protocol.     

基于物联网的辐射源安全监管系统的设计与实现

辐射源具有强烈的社会敏感性,无论是丢弃还是泄漏,都会给人类社会和环境造成无法估量的损失和危害。为了使其能够进一步造福于人类社会,对辐射源进行规范使用,安全监管尤为重要。文章介绍了一套集辐射源剂量监测、RFID电子标签、GPS地球定位、位移检测、视频监控和管理为一体的安全监管物联网应用系统,以降低辐射源被盗的风险,准确高效地实现辐射源安全监管的目标。     

Using the World Wide Web for Art and Humanities Reference Services

Abstract

This paper describes what the World Wide Web is and what is needed in order to access its information. It discusses the future of art and humanities reference resources and presents criteria for evaluating Web sites. A review of the literature related to “Generation X” and their information expectations was done. There is an annotated list of specific World Wide Web resources related to African Diaspora, American Poetry, Comparative Literature, Gay and Lesbian Literature, and Outsider Art. This list provides examples for evaluation and is not meant to be exhaustive.     

Appalachian State University Libraries' Ask A Librarian: A Reference Service for ASU Students,Faculty, Staff,and Alumni

SUMMARY

As dynamic content is filling the Internet, so are choices for implementing this service/tool for Web developers. This article concentrates on one of the solutions that offers choices and tools in a single free package. Zope delivers Web-based content using a variety of sources and Internet connections. At Appalachian State University, Ask A Librarian http://www.library.appstate.edu/reference/askref.html concentrates on using Zope, the PostgreSQL database, e-mail, and the Web to offer patrons the opportunity to receive guidance from reference librarians while at a remote location.     

Open source: the Russian experience (legislation and practice)

The emergence of so-called free or open-source software and the growth of its economic importance in various industries make questions regarding the legal status of free/open-source licenses especially important. In December 2010, new draft amendments to the Civil Code were published, introducing new concepts in order to reflect the ideas pursued by these types of licenses. This article analyzes existing problems with the legal status of free/open-source licenses, whether proposed amendments may solve them, and what risks they may create. Since Russia is among the first countries trying to include provisions on free/open-source licenses in its legislation, such analysis may be of interest to foreign lawmakers since the concept of open source is universal all over the world.