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Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology最新文献

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A Feasible Process For Mining Corpus From Web 一种可行的Web语料库挖掘方法
Chao Wang, Dequan Zheng, T. Zhao, Ji Guo
Mining bilingual parallel sentence pair from Web data is the most effective way to get large-scale of bilingual corpus. In this paper, we put forward both the set of method and the series of process for extracting parallel sentence pair from nonspecific web date source. considering 1.1 billion page as the web data input, with a sequence of steps we get several sentences pair which has 81% recall and 85% precision, on this basis we bring up a parameter for measure quality of sentence pair. After filter sentence pair by this parameter, we get 850 thousand unique sentence pairs. On filtering by this parameter, the precision increase to 95%, meanwhile the recall only decrease by 1%.
从Web数据中挖掘双语平行句对是获取大规模双语语料库的最有效途径。本文提出了从非特定web数据源中提取并行句对的一组方法和一系列过程。以11亿页的网页数据为输入,通过一系列步骤得到了召回率为81%、准确率为85%的句子对,并在此基础上提出了衡量句子对质量的参数。通过该参数对句子对进行过滤,得到85万个唯一的句子对。采用该参数过滤后,准确率提高到95%,召回率仅下降1%。
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引用次数: 0
A conceptual model for preventing web bypass vulnerabilities 防止web绕过漏洞的概念模型
Zhiqiang Wei, Kaiyuan Shi, Dongning Jia
This paper provides a conceptual model for reducing bypass vulnerabilities in web applications. The typical and primary two kinds of bypass vulnerabilities are authentication and access control vulnerabilities. Authentication attacks occur when a web application authenticates users incorrectly and grants access for users without appropriate credentials. Access control attacks happen when access control check is incorrect or missing, allowing unauthorized access to privileged resources. Such attacks are getting increasingly common and have occurred in many famous web applications such as IIS and WordPress, and 14% of surveyed web sites [5]. However, currently no available tools or methods can prevent these attacks efficiently. By using Dynamic Information Flow Tracking (DIFT) techniques to track the flow of user credentials through the application's language runtime, the model presented in this paper can automatically detect when an application safely and correctly authenticates users. Then the model combines authentication information with programmer-supplied access control rules to automatically ensure that only properly authenticated users are granted access to privileged resources or data.
本文为减少web应用中的旁路漏洞提供了一个概念模型。典型的和主要的两种旁路漏洞是身份验证和访问控制漏洞。当web应用程序错误地对用户进行身份验证并授予没有适当凭据的用户访问权限时,就会发生身份验证攻击。访问控制攻击发生在访问控制检查不正确或缺失时,允许对特权资源进行未经授权的访问。这种攻击越来越普遍,在许多著名的web应用程序中都有发生,如IIS和WordPress, 14%的被调查网站[5]。然而,目前还没有有效的工具或方法可以有效地防止这些攻击。该模型采用动态信息流跟踪(Dynamic Information Flow Tracking, DIFT)技术在应用程序的语言运行库中跟踪用户凭证的流动,从而自动检测应用程序何时安全、正确地对用户进行身份验证。然后,该模型将身份验证信息与程序员提供的访问控制规则结合起来,自动确保只有经过适当身份验证的用户才被授予对特权资源或数据的访问权限。
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引用次数: 0
Modal analysis of compound grinder for grinding end face and inner hole 端面和内孔复合磨床模态分析
M. Duan, Boyin Li
According to the structure of compound grinder for grinding end face and inner hole of tappet body, this paper established the finite element (FE) model and presented the modal analysis of the compound grinder and its components by means of three-dimensional software and FE method. The first four natural frequencies and modal shapes of the compound grinder were given. As a result, the weaknesses of the compound grinder were determined and it offered the basis for improving dynamic property of the compound grinder.
针对挺杆体端面和内孔磨削复合磨床的结构,建立了复合磨床的有限元模型,并利用三维软件和有限元方法对复合磨床及其部件进行了模态分析。给出了复合磨床的前四阶固有频率和模态振型。确定了复合磨床的缺点,为提高复合磨床的动态性能提供了依据。
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引用次数: 0
Research on RFID-based monitoring platform for wireless sensor networks 基于rfid的无线传感器网络监控平台研究
Y. Hu, Xiaowang Guo, Jianyong Zhu
A RFID tag based wireless sensor test platform is proposed in this paper, the system build a real-time monitoring of sensor network platform by using RFID tag and WSN technology. By the combination of the wireless sensor nodes, and RFID technology, and other basic technology of things, the building of an intelligent wireless sensor monitoring platform is proposed, which can not only expand the wireless sensor network are aware of the depth and breadth of information, but also the real-time monitoring and positioning quality of the items can be achieved. In this paper, the overall design of the system is proposed and the system routing and positioning protocol is analyzed, the core technologies in design are discussed, and the system is a overall solution for comprehensive RFID-based wireless sensor network to monitor.
本文提出了一种基于RFID标签的无线传感器测试平台,该系统利用RFID标签和WSN技术搭建了一个实时监测传感器网络的平台。通过将无线传感器节点与RFID技术等物联网基础技术相结合,提出构建智能无线传感器监控平台,不仅可以扩展无线传感器网络感知信息的深度和广度,还可以实现对物品的实时监控和定位质量。本文提出了系统的总体设计方案,分析了系统路由和定位协议,讨论了设计中的核心技术,是一种基于rfid的无线传感器网络综合监控的整体解决方案。
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引用次数: 3
Design and development of rolling bearing vibration signal analysis system 滚动轴承振动信号分析系统的设计与开发
Wensheng Su, Fengtao Wang
Taking the respective advantages of LabView and Matlab, an on-line vibration signal analysis system of rolling bearing was designed and developed. First, system scheme design was introduced. Then each module of the system was discussed. Finally, system application examples were given, which verified the convenience and effectiveness of this system.
利用LabView和Matlab的各自优势,设计开发了滚动轴承振动信号在线分析系统。首先介绍了系统方案设计。然后对系统的各个模块进行了讨论。最后给出了系统的应用实例,验证了该系统的便捷性和有效性。
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引用次数: 2
Similarity theory which used in knuckle-joint press design 相似理论在关节压力机设计中的应用
Danhong Li
We have designed the knuckle-joint press which can fit parametric variation. According to the theory about combining press devices' size design with similarity theory, we have designed knuckle-joint press's mechanical design by means of engineering limitation. We also have verified these designs for many times by comparing design model with formulations, which makes the whole design meet practical using. The methods which have been introduced here have great important roles on mechanical design.
设计了能适应参数变化的关节压力机。根据压力机装置尺寸设计与相似理论相结合的理论,结合工程局限性,设计了关节压力机的机械设计。我们还通过对设计模型和配方的对比,对这些设计进行了多次验证,使整个设计符合实际使用。本文介绍的方法在机械设计中具有重要的作用。
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引用次数: 2
The algorithm research of penetration distance based on normalization processing 基于归一化处理的侵彻距离算法研究
Jun-wei Sun, Ya Zhang
In order to get the real-time penetrating distance of the projectile and make it detonate in the predetermined depth, this article puts forward the algorithm of penetration distance based on normalization processing, using ANSYS/LS-DYNA software to simulate the process of projectile penetrating vertically into concrete targets through which the projectile penetration acceleration signal can be reached, reading the signal by utilizing the penetration distance detonation control module, and verifying the algorithm. The result indicates that the relative error of this algorithm is small, and it can also reduce the processing time of the microprocessor, which states that this algorithm is well-designed.
为了获得弹丸的实时侵彻距离,使其在预定深度内起爆,本文提出了基于归一化处理的侵彻距离算法,利用ANSYS/LS-DYNA软件模拟弹丸垂直侵彻混凝土目标的过程,通过该过程可以获得弹丸的侵彻加速度信号,利用侵彻距离爆轰控制模块读取信号。验证算法。结果表明,该算法的相对误差较小,并且可以减少微处理器的处理时间,说明该算法设计得很好。
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引用次数: 1
Measuring the performance of knowledge sharing in regional innovation 区域创新中知识共享绩效的测度
Y. Xi, Kang Ping
Based on panel data collected for seven years (2003–2009) of 30 provinces, the efficiency of knowledge sharing in regional innovation in China was evaluated by DEA Malmquist indexes model. The result indicated that knowledge sharing efficiency of six regions was improved respectively. As the same time, technical efficiency of knowledge sharing process in West China grew fast because of the advantage of backwardness so that it can acquire and absorb knowledge more quickly. As being lack of satisfactory performance in the technical efficiency, cross-organization excitation mechanism that support cross-sector collaboration and knowledge transfer between institutions and locally industries were more or less unsatisfactory.
基于中国30个省区2003-2009年的面板数据,采用DEA Malmquist指数模型对中国区域创新中的知识共享效率进行了评价。结果表明,6个区域的知识共享效率均有所提高。与此同时,由于西部地区的后发优势,使得西部地区知识共享过程的技术效率快速增长,从而能够更快地获取和吸收知识。支持机构与地方产业之间跨部门协作和知识转移的跨组织激励机制在技术效率方面表现不理想。
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引用次数: 0
Coal mine reconfigurable monitoring model based on Wireless Sensor Network 基于无线传感器网络的煤矿可重构监控模型
D. Zhang, Rui Wang, Jian Cai
In this paper, we present the model of reconfigurable monitoring based on Wireless Sensor Network (WSN), which merges the technology of reconfigurable virtual instrument and WSN. A set of multi-function monitoring instrument platform with WSN characteristic was developed by using Visual Studio software. This instrument can not only visually display the present topological graph of monitor area, but also enhance module reuse. Finally, a monitoring instrument, facing the equipment of hoist room in coal mine, was designed and constructed. The result shows the platform realizes reconfigurable function of the instrument module online and dynamically.
本文将可重构虚拟仪器技术与无线传感器网络技术相结合,提出了一种基于无线传感器网络的可重构监测模型。利用Visual Studio软件开发了一套具有WSN特点的多功能监测仪器平台。该仪器不仅能直观地显示当前监控区域的拓扑图,还能提高模块的可重用性。最后,针对煤矿提升室设备,设计并制作了一套监控仪表。结果表明,该平台在线动态地实现了仪器模块的可重构功能。
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引用次数: 0
Simulation research on direct sequence spread spectrum communication system over Rayleigh Fading Channels 瑞利衰落信道下直接序列扩频通信系统的仿真研究
Yun-hang Zhu, Ping-hua Zhang, Ming-yuan Deng
Under the software environment of MATLAB/Simulink, the communication system of direct sequence spread spectrum (DSSS) is dynamically modeled and simulated over a new practical Rayleigh channel, and the relationship curves of the bit error rate (BER) with the signal-to-noise ratio (SNR) of DSSS communication systems are presented. It is analyzed that DSSS system can effectively overcome multipath fading in multipath Rayleigh Fading Channel (RFC). In addition, the anti-multipath fading performance improved by the way of increasing pseudo noise (PN) code length is better than that by the way of increasing the spread spectrum gain in the condition of strong multipath fading.
在MATLAB/Simulink软件环境下,对直接序列扩频(DSSS)通信系统在一种新的实用瑞利信道上进行了动态建模和仿真,给出了DSSS通信系统误码率(BER)与信噪比(SNR)的关系曲线。分析了DSSS系统在多径瑞利衰落信道(RFC)中能够有效克服多径衰落。此外,在强多径衰落条件下,增加伪噪声码长比增加扩频增益改善的抗多径衰落性能更好。
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引用次数: 7
期刊
Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology
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