基于模糊聚类的矢量量化的声纹识别研究

采用模糊C-均值聚类算法(FCM)实现声纹码本的矢量量化,使用基于相似系数和的孤立点检测法识别孤立点.试验表明,该方法能有效地减少孤立点对识别结果的干扰,显著降低码本量化误差,从而提高矢量量化声纹识别系统的识别率.     

男性叙述框架下多重的女性声音——从《呼啸山庄》看女性作者的叙述策略

《呼啸山庄》作者使用了故事内叙述者多层次叙述的策略,男性故事内叙述者作为小说第一叙述层的叙述者,引出第二和第三层次女性故事内叙述者的叙述。这样的策略树立了隐含作者的权威,避免了读者抵制情绪的产生,在一定程度上摆脱了男性话语体系的束缚,自然地表达出女性的声音。     

基于Web的告警实时显示系统的设计与实现

为提高Browser/Server (B/S)系统告警监视的实时性,通过深入研究同步、异步以及“订阅/发布”3种通信方式,并对异步JavaScript和XML (AJAX)、Comet和Flex 3种技术进行比较,提出了应用Flex技术实现基于web的告警实时显示系统的方法．对Client/Server(C/S)告警实时显示系统及分别应用了AJAX、Comet和Flex技术的B/S告警实时显示系统进行了平均反应时间的测试,结果表明,该法能有效提高B/S系统告警监视的实时性.     

实验室智能安防报警系统研究

本文主要对实验室智能安防报警系统进行了研究,完成了一种远程安防报警装置控制系统的设计,该系统综合运用单片机、ZigBee无线通信技术,在介绍了系统基本架构及工作原理的基础上,完成了包括安防报警传感器选型在内的软硬件设计过程。该智能安防报警系统完成各传感器信息实时高效的采集和逻辑判断后,向单实验室信息集中节点反馈经处理后的信息,再由主节点汇总处理各集中节点信息并进行实时显示。     

QoE-driven voice quality evaluation model of VoIP based on network simulation

The quality of experience (QoE) evaluation model for voice over IP (VoIP) service is studied to analyze the impact of network parameters on voice quality and monitor voice quality in real-time for operators. Firstly, the influence of some network parameters on the voice quality of VoIP is investigated. Then, a simulation platform for VoIP transmission is built to collect voice data under different network enviornments. According to the simulation results, a new mapping model between these arguments and VoIP voice quality is deduced. Finally, the accuracy of this voice quality evaluation model is examined and the results demanstrate that it has high reliability and feasibility.     

大功率动磁式音圈电机优化及试验研究

针对音圈电机的大功率应用场合,设计了一种动磁式音圈电机。电机最大推力可达到2000 N。利用Matlab优化程序包,采用非线性约束最小化优化方法,以力密度为目标函数,对电机进行了参数优化,并对优化结果进行了分析和ANSYS仿真验证。仿真结果表明优化方法可行。设计试验平台,对样机进行了静力学试验研究。试验结果表明,电机推力满足应用要求,可作为一种大推力电机投入工业应用。     

基于DS6MX-CHI报警主机的家庭安防系统

本文利用DS6MX-CHI报警主机和红外对射探测器、被动红外探测器、门磁以及紧急求助按钮和声光报警器等组成家庭安防系统。该系统能自动探测发生在布防区域内的入侵行为,产生报警信号,并辅助主人及时发现发生报警的区域部位。一旦发生突发事件,就能发出声光报警信号并在安保控制中心准确地显示出出事地点,便于迅速采取应急措施。     

科技英语中被动语态的翻译

被动语态是科技英语一个极其重要的句法特征,它的译法也十分灵活。通过讨论被动语态使用的场合,分析在科技英语中几种常见的被动语态翻译方法,提出只有采用灵活多样的翻译方法,才能使译文既在信息传递上准确无误,又在语言表达上符合汉语的行文习惯,确保译文在中文语境下的可读性。     

数控机床主轴无报警故障的检修

以XK71SF数控铣床、XHK716加工中心及进口加工中心为例，介绍了数控机床主轴无报警故障的几种检修方法。     

High-energy NdFeB magnets and their applications

In sintered NdFeB magnets, additive elements for increasing coercivity decrease residual magnetization. Also, fine magnetic powder oxidization prevents identification of the stoichiometry composition (Nd ₂Fei₁₄B).To improve the magnetic properties of a sintered NdFeB magnet, the authors have developed a method involving two alloys. Magnetic Nd ₂Fei₁₄Balloy and a rare- earth- rich alloy (including richer dysprosium content) are melted individually and mixed together after coarse pulverization. After the sintering process, dysprosium in the sintered body is enriched in each grain region near the grain boundary. The two- alloy method minimizes the liquid phase necessary to keep the coercive force at a useful level, and thus results in compositions closer to stoichiometry. The energy product of magnets having an inhomogeneous dysprosium distribution is typically 360 kj - m ^{- 3} (45 MG.Oe) at production level. The corrosion characteristics of cobalt- substituted NdFeB magnets also were investigated. These magnets are now used in voice coil motors for hard disk drives and contribute to shortening access time and hard- drive downsizing.