本研究提出了一种基于多重沙盒映射与文件分叉的多用户系统，可以改善云架构的效率。该系统包含有基础服务器，有文件系统，注册表系统，以及可安装应用程序等。在服务器上创建有多个用户，并在服务器上安装针对各个用户的多用户的全局服务沙盒，全局服务沙盒重定向程序对系统的消息与进程进行拦截与路径重定向，将客户端的文件操作、注册表操作和程序进程操作的真实路径指向对应该服务沙盒的真实存储区，各个服务沙盒均设置各自对应的存储位置来存储重定向后的文件；远程用户进入服务沙盒后，其explorer进程等也都应用于沙盒的映射重定向关系，从而其桌面实际上在服务沙盒中，与服务沙盒外的桌面不同，进入后通过其桌面快捷方式或开始菜单等打开任何程序，均通过服务沙盒打开，运行相关的程序文件组件也实际上是创建了重定向的副本（多副本运行架构）；每一个服务沙盒都有着自身独立的映射关系，有着自身的重定向存储，与其他用户的服务沙盒隔离。

本文为公司和家庭探索设计了一款基于梅尔倒谱系数和高斯混合模型的声纹识别的简易门禁系统,主要基于STM32平台.为了实现无接触式畅通,用户也可在APP上进行声纹验证,此APP基于讯飞开放平台,具有较高的准确性和识别效率.

本文设计并制作了一种基于晶体管放大器的非线性失真研究装置.本装置以频率为1kHz、峰峰值为20mV的正弦波作为晶体管放大器输入信号,输出峰峰值不低于2V的无明显失真波形及其余四种失真波形,并对输出波形进行AD采集后,通过FFT方式计算输出信号的总谐波失真值(Total Harmonic Distortion).本装置由STM32F407核心控制板、晶体管及偏置电路组成.通过改变五个通道的放大器偏置电路调节静态工作点,同时采用4051模拟开关进行五种波形通道的切换,实现"无明显失真"、"顶部失真"、"底部失真"、"双向失真"、"交越失真"五种波形输出,并在TFT LCD屏上显示波形以及THD值.

A novel dual-mode optimized patch capacitor loaded T-type resonator is proposed for the design of a dual-band filter (DBF). The resonator has its lowest even- and odd-mode at the two expected passband frequencies and the first spurious mode far away from the passbands. For tuning of the two sets of coupling strengths for both passbands, open/shorted secondary coupling structures are introduced as a fine-tuning coupling structure to increase/decrease the primary coupling strength. A four-pole DBF with passbands centered at 2450 and 3500 MHz, respectively, is proposed and fabricated using the HTS material. The measured results of the filter indicate superior performance and good fitting with the simulation results. The return losses of both passbands and the insertion losses obtained by measurements are greater than 14 dB and less than 0.3 dB, respectively. The stopband rejection exceeds 50 dB up to 8.0 GHz.

建设健康城市已成为当今世界城市发展不可逆转的历史潮流,而智能医疗是建设健康城市进程中不可或缺的一部分.未来会有越来越多的传感器技术、人工智能技术、无线传播技术应用到医疗建设中,使医疗手段更加的智能化、便捷化和安全.基于以上背景,本文设计的远程输液监测系统设计能为病人提供一个更为健康、安全与舒适的环境.基于STM32的远程输液监测系统主要由病人端的分机设备和护士端的主机设备两部分组成.病人端红外对管获取点滴液位信息,与预设值相比较,确定此刻是否需要发出提示,将数据传递到单片机.后续两个单片机之间通过Wi-Fi传输信息,将病人的床位/座位号信息显示在护士端的显示屏上,并通过语音播报病人的床位/座位号,提醒护士前去拔针或者更换点滴药物,从而实现远程输液监测.

本文设计的汽车智能防盗报警系统,由震动传感器SW-18020P、单片机STM32F407ZGT6、GPS定位模块UBLOX-NEO-6M、通信模块SIM900A及外围电路构成.该系统可以对汽车进行实时监控,当发生盗劫情况时,车身的异常震动触发该系统,将定位模块获取的定位信息通过移动通信网络发送给车主.如果汽车位置异常或者车主主动发送位置获取指令,也可以让报警器上报汽车当前位置信息,从而实现了一种具备异常震动检测、可发送实时位置的防盗报警系统.

本设计是基于STM32单片机为主控芯片的智能安全门铃系统.该系统采用MLX90614ESF红外模块进行体温检测,使用AS608指纹模块识别指纹,ESP8266-WiFi模块MQTT协议进行无线通信.在继承传统门铃优点的基础上,增加了对造访者体温检测、指纹识别的功能,通过阿里云生活物联网平台实现门铃与智能手机间的实时通信,做到了安全、方便、高效,可以满足人们现代日常生活的基本需求.

本文利用电容式传感器FDC2214设计制作了一个纸张计数器.待计数的纸张放置并被压紧于平行板电容器的两金属极板间,电容值随板间距(纸张厚度)变化,从而引起计数器前端谐振回路谐振频率变化.该传感器将感测到的谐振频率变化数字化,并送处理器进行中值平均滤波以降低噪声影响.系统将采样值与前期校准学习预存数据进行比对匹配,从而得到纸张计数值,并对计数结果进行液晶显示和语音播报输出.

In this study, we propose a stepped-impedance-stub loaded interdigital capacitor resonator for design of a dual-band band-pass filter with a large bandwidth ratio. The presented resonator has strong and weak couplings in the upper passbands (UPs) and lower passbands (LPs), respectively, so as to form a large upper/lower bandwidth ratio. Adopting a dual-branch phase-matched feedline structure can meet the external quality factors required for the UP/LP. Therefore, these two passbands, defined by their respective center frequencies and bandwidths, can be manipulated independently. A four-pole dual-band example filter with a lower bandwidth of 20 MHz at 1576 MHz and an upper bandwidth of 200 MHz at 2450 MHz is successfully designed on an YBCO/MgO superconducting wafer. The filter exhibits excellent frequency responses. The upper/LPs show insertion losses below 0.07/0.22 dB and return losses above 15.3/15.3 dB. The stopband rejection is better than 57 dB until the first spurious passband up to 6150 MHz (3.9fL).

A wideband wide stopband filter is designed using asymmetric stepped-impedance resonators (ASIRs) connected to a large open stub. The capacitive open stub and the parallel-coupled microstrip line are used to achieve the strong couplings for large fractional bandwidth (FBW). For a wide-stopband performance, the proposed filter uses ASIRs to improve the high-order spurious resonant frequency. The first and last resonators of the proposed filter are further optimized to suppress the spurious resonant frequency caused by open stub. The final filter has a 70% FBW centered at 4.87 GHz with 20-dB-rejection stopband up to 15.78 GHz (approximately 3.24f(0)). The measured insertion loss is less than 0.15 dB and the return loss is better than 17 dB.

本设计基于STM32微控制器,可同时对1Hz至10KHz频率范围内的四路PWM信号的频率及占空比进行测量,并可同时产生在该频率范围内四路频率相同、占空比不同的可调PWM信号.构建量程自动匹配算法、按键扫描、定时器配置等软件程序,使用LCD液晶屏、按键等外设模块,采用Keil C51开发环境进行设计,通过仿真器和硬件下载测试,验证了本次设计的可行性.

本文设计的语音控制系统,由LD3320语音识别芯片、单片机STC11L08XE及外围电路构成.由LD3320芯片对用户发出的控指令进行收集和识别,并将识别出来的结果发送给单片机,单片机STC11L08XE作为核心处理器,根据接收到的数据控制I/O口的高低电平,从而控制由LED灯模拟的家电的开关,实现语音控制的家居系统.

生活中常有各类分拣工作需要人或机器完成,机械组成的系统有成本低、效率高、准确率高等优势.将颜色作为一种判断标准进行分拣是当下较为流行的分拣方式之一,例如农业生产中通过颜色识别果蔬颜色判断成熟度、药厂通过颜色分拣药片药丸、快递业通过识别快递单颜色识别不同的快递公司等.本论文设计基于颜色传感器的自动分拣系统主要由颜色传感器TCS3200、舵机MG995和主控模块构成,所设计的系统具有根据颜色自动分拣的功能.

A high-temperature superconducting wideband bandpass filter based on a triple-mode resonator is developed in this letter. A novel triple-mode resonator, which can not only generate a wide passband at low frequency but also suppress the harmonic responses and obtain a wide stopband, is proposed. To further improve the selectivity, we load two stubs at the input and output ports to generate one transmission zero at the low passband. The simulation results show that the filter is centered at 1 GHz (f(c)) with 111% 3-dB fractional bandwidth and has an upper stopband to 3.5f(c). The measured results show that the return loss is larger than 15 dB, and the insertion loss is less than 0.26 dB.

A stepped-impedance-stub loaded stepped-impedance resonator (SISLSIR) is proposed to design a dual-band bandpass filter. The even- and odd-mode frequencies and the coupling strength of the proposed resonators can be independently designed and adjusted. A dual-feedline structure is used to meet the required external couplings of the 2 passbands. Thus, both the center frequencies and the bandwidths of the 2 passbands can be independently controlled. A 6-pole dual-band filter with the passbands of 3300 approximate to 3600 MHz and 4800 approximate to 5000 MHz is successfully designed using the proposed method and fabricated with YBCO/MgO high-temperature superconducting (HTS) wafer. The measured results of the filter exhibit high performance and match well with the simulations. The measured insertion losses are less than 0.2/0.3 dB, and the return losses are greater than 15/14 dB for the lower/upper passbands, respectively. The out-of-band rejection is greater than 68 dB up to 12 GHz.

In this study, we propose a novel resonator that is composed of a modified spiral with an embedded interdigital capacitor. A large ratio of the first spurious frequency to the fundamental resonant frequency is obtained, which is suitable for the design of filters with wide stopbands, and the circuit size is considerably reduced by embedding the interdigital structure in the spiral. For demonstration, a compact four-pole high temperature superconducting（HTS） filter with a center frequency of 568 MHz is designed and fabricated on double-sided YBCO film with a size of 11.4 mm×8.0 mm. The filter measurement shows excellent performance with an out-of-band rejection level better than 60.9 dB up to 3863 MHz.

This paper presents a design method for moderate‐wideband filters with modified λ/2 stub resonators mid‐tapped by λ/4 connecting lines which act as admittance inverters. The modified tapped‐stubs avoid low characteristic impedances of the stubs which results in a very wide strip‐width and a large circuit size. An example filter at 2250 MHz with a fractional bandwidth (FBW) of 45% is successfully designed with this method and fabricated. It has a compact size of 26.5 mm × 10.5 mm on a YBCO/LaAlO3 superconducting wafer. The measurements show good response and match well with the simulations.

In this paper, we present a compact quint-band superconducting filter operating at 2.4, 3.5, 4.7, 5.3, and 5.9 GHz.Matching junctions with different impedance branch lines are used to connect a dual-band sub-filter with a tri-band sub-filter and to reduce the channel interactions. The quint-band filter design is divided into two sections to determine the controllable frequencies and bandwidths, while ensuring compact size and reducing design complexity. The filter is fabricated on double-sided YBCO film deposited on an Mg O substrate with a size of 26 mm×19 mm. The measured results match well with the simulations.

本论文是基于嵌入式的人体感应调光台灯设计,该系统通过监测人体热辐射和环境光强来控制台灯亮灭,具有在光线较弱的环境中达到人来灯亮人走灯灭的功能.设计中加入了蓝牙功能,可以利用安卓软件通过蓝牙来控制台灯颜色,使智能灯营造出不同场景下所需的灯光氛围.

TPMS is special equipment to examining the tire pressure and judging the leaking. It is the tendency that automobiles are equipped with the TPMS as well as ABS. The text introduces the circuit design and technique details of the TPMS. TPMS is distribution system which it includes one master module and lots of attachment modules. Every tire has low consumption attachment modules,which delivers messages such as the value of the tire pressure to the master module.