双传声器指向性噪声消除在手机中的应用

介绍了一种手机中使用的指向性双传声器噪声消除系统.系统采用两个灵敏度一致性较好的全指向性传声器,形成锥形指向性拾音波束,只接收120.范围以内的信号,大大减少拾音波束之外的噪声干扰;紧接着使用单通道语音增强算法,可进一步衰减采集到信号中的背景噪声.实验结果表明,该系统在保持了较小的语音失真的前提下,对于各种类型的背景噪...     

Bio-Inspired,Scalable, and Tri-Mode Stimuli-Chromic Composite for Smart Window Multifunctionality

Smart window is promising to save building energy and reduce carbon emissions. The fast development leads to a high demand for multifunctionality not limited to energy saving, while the material design and fabrication are challenging. Herein, a scalable method is developed for tri-mode light regulations: thermo-, mechano-, and hydro-/solvato-chromisms. The film is constructed of a bio-inspired hierarchical-structured surface and a functional elastomer base. Through combined experiments and simulations, the triple-stimuli-chromic mechanisms of strain-induced surface structure deformations, wettability-controlled reflective index matches, and thermal-responsive nanostructural resonances, respectively are revealed. Besides a good energy-saving performance, the robust method shows several advantages: 1) independent energy-saving and privacy functionalities, 2) an additional hydro-/solvato-chromic mode to control privacy in extreme circumstances, and 3) designable patterns and colors to meet high aesthetic demand. The work may inspire the future development of multifunctional smart windows and spatio-temporal light control methods.     

移动智能平台的可信计算体系结构与应用研究

在分析移动智能平台安全需求基础上,从逻辑原理、硬件组成、软件系统三个层面提出了移动智能平台的可信计算体系结构,之后提出了包含十种可信计算应用功能的全景图。     

High-resolution three-dimensional atomic microscopy via double electromagnetically induced transparency

We aim to present a new scheme for high-dimensional atomic microscopy via double electromagnetically induced transparency in a four-level tripod system. For atom–field interaction, we construct a spatially dependent field by superimposing three standing-wave fields(SWFs) in 3 D-atom localization. We achieve a high precision and high spatial resolution of an atom localization by appropriately adjusting the system variables such as field intensities and phase shifts. We also see the impact of Doppler shift and show that it dramatically deteriorates the precision of spatial information on 3 D-atom localization. We believe that our suggested scheme opens up a fascinating way to improve the atom localization that supplies some practical applications in atom nanolithography, and Bose–Einstein condensation.     

What installed mobile applications tell about their owners and how they affect users’ download behavior

The rapid growth in the mobile application market presents a significant challenge to find interesting and relevant applications for users. An experimental study was conducted through the use of a specifically designed mobile application, on users’ mobile phones. The goals were; first, to learn about the users’ personality and the applications they downloaded to their mobile phones, second to recommend applications to users via notifications through the use of experimental mobile application and learn about user behavior in mobile environment. The question of how the personality features of users affect their compliance to recommendations is explored in this study. It is found that conscientiousness is positively related with accepting recommended applications and being agreeable is related with the preference for the applications of editor’s choice. Furthermore, in this study, applications owned by the user and the composition of applications under categories and their relation with personality features are explored. It is shown that the number of user owned applications and their category differ according to gender and personality. Having similar applications and the number of applications owned under specific categories increase the probability of accepting recommended applications.     

智能终端系统安全性研究

对智能终端所面临的安全威胁及安全需求进行了研究,分析比较了当前主流智能终端操作系统的安全特性、架构和机制,并针对现有安全问题及机制提出了安全增强方法,最后对智能终端系统未来发展趋势进行了预测分析。     

基于GSM短信息的热水器遥控系统

应用物联网中远程控制的技术,提出了基于移动通信网络的热水器遥控系统设计,采用GSM手机模块P1300的短信息功能,具体设计了监控端核心控制通信模块,并用C语言设计了软件,家庭热水器遥控系统实现方案正确可行。     

从信息安全中挖掘服务和业务价值

从两部委对信息安全监控提出的新需求入手,分析并提出了信息安全发展的两个趋势——个性化和全面有效覆盖。面对新需求通过两个建设方案实例分析,提出如何从信息安全中挖掘服务和业务价值。最后总结了创造信息安全服务价值面临的挑战,并提出信息安全服务架构的思路。     

应用于手机中的小型化WLAN双频天线设计

设计了一款适用于手机的小型化WLAN天线,尺寸为10 mm×35 mm,天线的主要结构为一个折叠型倒L-L结构.设计过程中采用了共面波导馈电（CPW）技术,有效地增加了天线的带宽.仿真结果表明,天线在2.45 GHz时覆盖了2.38 GHz ～ 2.688 GHz,5.2 GHz时覆盖了4.77 GHz～6 GHz,同时达到了IEEE 802.1 1a和IEEE 802.11 b/g标准.整体来说,天线尺寸小、频带宽,方向图性能良好.对天线进行了实物加工并进行了测试,结果显示仿真与实验结果吻合,均能覆盖所需频段.     

移动电话机通用锂离子电池解决方案探讨

2010年11月ITU-T SG5在日内瓦召开的会议中,讨论了工信部电信研究院泰尔实验室（CTTL）提出的移动电话机和其他ICT设备通用锂离子电池解决方案。本文从移动电话机用锂离子电池的使用现状及遇到的问题入手,阐述了电池通用化的目标,提出了我们的解决方案,并着重对标准化工作中各国关心的问题给出了建设性意见。