基于蓝牙技术的嵌入式多生理参数监护仪

介绍了一种采用蓝牙技术的嵌入式多生理参数监护仪,能实时检测人体心电信号(ECG)、心率、血氧饱和度(SpO2)、血压和体温等多生理参数,是一种适用于社区医疗和面向家庭的新型多功能监护仪。该监护仪具有蓝牙无线通信功能,能够多路采集,LCD实时显示,二十四小时生理信息存储,生理参数统计分析与诊断,监督报警的功能。采用先进的16/32位RISCARM7DMI为内核的S3C44B0X芯片和CSR公司单片BLUECORE2-EXTERNAL作为主控制处理器模块和蓝牙通信模块。     

基于蓝牙技术的即插即用传感器系统研究与实现

主要介绍如何使传统传感器具有自我表述能力以实现即插即用功能。即通过读取传感器上嵌入的一块存储器上存储的TEDS,得知该传感器的所有重要信息。有效地克服了传统传感器的复杂搭建连线过程。此外,引入了蓝牙无线技术,对异地无线测量系统和即插即用测量设备的研究有一定的应用和参考价值。     

Application of neural-fuzzy controller for streaming video over Bluetooth 1.2

This paper is to introduce an application of Computational Intelligence (CI) to Moving Picture Expert Group-4 (MPEG-4) video compression over IEEE.802.15.1 wireless communication, known as Bluetooth 1.2, in order to improve picture quality. The 2.4 GHz Industrial, Scientific and Medical frequency band is used for the IEEE.802.15.1 standard. IEEE.802.15.1 can be affected by noise and interference due to other neighboring wireless devices sharing the same frequency carrier. The noise and interference create difficulties in ascertaining an accurate real-time transmission rate at the receiving end. Furthermore, the MPEG-4 codec is an object-oriented compression system and demands a high bandwidth. It is therefore difficult to avoid excessive delay, image quality degradation and/or data loss during MPEG-4 video transmission over standard systems. A new buffer entitled ‘buffer added’ has been introduced at the input of the Bluetooth 1.2 device. This buffer is controlled by a Rule-Based Fuzzy (RBF) logic controller at the input and a neural-fuzzy controller (NFC) at the output. The two new fuzzy rules manipulate and supervise the flow of video over the Bluetooth 1.2 standard. The computer simulation results illustrate the comparison between a non-CI video transmission over Bluetooth 1.2 and the proposed design, confirming that the applications of RBF and NFC do improve the image quality, reduce data loss and reduce time delay.     

CC2540和SHT11的无线温湿度采集系统设计

蓝牙无线技术是使用范围最广泛的全球短距离无线标准之一,蓝牙4.0规范的核心是蓝牙低功耗(BluetoothLow Energy)技术,本设计采用基于BLE技术的CC2540芯片,利用SHT11数字温湿度传感器来进行温湿度的采集,并通过CC2540以无线方式将采集到的数据发送给监控终端。实验结果表明,本系统具有体积小、功耗低、精度高等优点。     

蓝牙技术及其在遥控器中的应用

蓝牙技术是一种短距离无线通讯技术，在计算机、信息家电以及各种移动设备中嵌入蓝牙技术，能够给用户带来极大的方便。同时，用蓝牙技术取代设备与设备之间的电缆，能够对无线移动数字通讯业务带来巨大的促进作用，本文简要介绍蓝牙技术，并且以蓝牙技术在遥控器中的应用说明如何实现蓝牙的应用模型。     

基于STM32的健康一体机控制系统的设计

设计与实现了一种基于STM32芯片、用于居家环境下的健康一体机控制系统.该系统由电源管理模块、蓝牙模块、SD卡模块、OLED显示模块等几部分组成,可以用于控制与处理多生理参数模块采集到的心电、血氧饱和浓度、血压、脉搏率、呼吸率、体温等人体生理信息数据,并且可以对数据解析进行OLED屏显示以及通过蓝牙或串口发送给外界显示设备进行显示.系统利用模块化设计理念,可以适应不同多生理参数采集模块,具有多功能、扩展性能好、可移植性高等特点.同时,系统利用OLED屏进行显示,区别于传统的医用大型设备,有效地减小了设备体积,降低了设备使用功耗,便于居家环境下使用.     

Testbed results of an opportunistic routing for multi-robot wireless networks

Opportunistic routing is a candidate for multihop wireless routing where the network topology and radio channels vary rapidly. However, there are not many opportunistic routing algorithms that can be implemented in a real multihop wireless network while exploiting the node mobility. It motivates us to implement an opportunistic routing, random basketball routing (BR), in a real multi-robot network to see if it can enhance the capacity of the multihop network as mobility increases. For implementation purposes, we added some features, such as destination RSSI measuring, a loop-free procedure and distributed relay probability updating, to the original BR. We carried out the experiments on a real multi-robot network and compared BR with AODV combined with CSMA/CA (routing + MAC protocol). We considered both static and dynamic scenarios. Our experiments are encouraging in that BR outperforms AODV + CSMA/CA, particularly in dynamic cases; the throughput of BR is 6.6 times higher than that of AODV + CSMA/CA. BR with dynamic networks shows 1.4 times higher throughput performance than BR with static networks. We investigate the performance of BR in the large-scale network using NS-2 simulation. We verify the effect of node density, speed, destination beacon signal and loop-free procedure. According to the large-scale simulation, the end-to-end throughput grows with the node speed.     

Arrays of large-area, tip/tilt micromirrors for use in a high-contrast projector

Arrays of two-degree of freedom analog micromirrors are designed for use within an high-contrast projector and fabricated using a multi-user MEMS fabrication process. We demonstrate a novel way of optimizing the tradeoffs between tilt angle and mirror size by subdividing the mirrors into smaller functional subsections that move synchronously. The mirror design employs multiple mirrors within a gimbal frame. The frame rotates around one axis, and each mirror within the frame rotates around a perpendicular axis, resulting in two-degree of freedom rotation. The design employs specific electrode shapes to allow one-layer connections. Using these fabricated mirrors, simultaneous actuation of mirrors within a composite structure is achieved. A prototype array of fabricated mirrors is described, with 6 × 5 mirrors each of 160 μm × 160 μm forming one composite mirror of an array, giving total active area of 960 μm × 800 μm. The mirrors can achieve a maximum tilt angle of 2.25°. The fill factor of this design is 68%.     

一种基于蓝牙的交互式系统设计与实现

随着无线互联技术和移动终端技术的发展,手机等移动终端用户对蓝牙产品的功能提出了更高的要求。蓝牙采用推送技术进行数据传输,用户只能选择是否接收,不能对蓝牙发送端的数据进行自主交互浏览。采用J2ME和蓝牙技术实现一种在移动蓝牙终端上使用的交互式系统,有效地利用了J2ME 跨平台的优势,以及蓝牙传送数据易用性和实用性等优点。根据对JSR82规范提供的Java蓝牙无线技术API的研究,给出了蓝牙交互式系统的设计方案和系统结构。通过J2ME的无线应用开发包和MIDlet编程模型,实现了交互式系统。     

The impact of perceived ease of use on Internet service adoption: The moderating effects of temporal distance and perceived risk

Perceived ease of use is found to affect consumer’s intention toward using an Internet-based service. However, to protect online transaction security, more security verification mechanisms are established which in turn increase the complexity and difficulty of using online services. This study proposed that the importance of perceived ease of use is depending on short- vs. long-term transaction expectation, product type, and whether security concern information is presented. In certain situations buyers or sellers of an Internet service may tolerate the inconvenience of using the Internet-based service. A 2 (verification requirement) × 2 (network externality) × 2 (short vs. long term) between-subject design was conducted on sellers of an auction site and a 2 (verification requirement) × 2 (product type) × 2 (with vs. without security concern information) between-subject design was conducted on buyers of an auction site. The results of two studies suggest that perceived ease of use increases the intention toward using online service when sellers expect that the Internet service usage is only for a short-term transaction or when buyers have no access of the security concern information on the website. In contrast, sellers prefer using an online service which requires a relatively high verification requirement when the purpose of using Internet service is for long-term transaction or when buyers have access of security concern information. The results also showed that perceived network externality positively affect sellers’ intention toward using an auction website.     

嵌入式操作系统中蓝牙支持软件的研究与开发

讨论在嵌入式操作系统中蓝牙支持软件的开发。包括蓝牙设备驱动程序、蓝牙协议栈、无线个人局域网应用框架等的设计与实现。采用系统化设计方法,重点突出结构设计、接口设计、任务设计。结果表明该蓝牙软件具有良好的可复用性、高效性和对嵌入式系统的适应性等特点,大大提高了系统开发效率。     

基于蓝牙技术的无线数据采集系统设计

利用蓝牙技术建立一个具有主从网络结构的蓝牙无线数据采集系统.设计采用基于BC219159蓝牙芯片的蓝牙模块;从设备以AT89C2051为控制器,将采集的工业现场信号处理后送入蓝牙芯片进行无线发送;主设备选用77E58作为控制器,实现对从设备的自动搜索连接和数据的接收,并通过LCD进行实时显示.系统地阐述了硬件和软件设计原理,对蓝牙通信协议进行了重点介绍.系统测试表明,有效通信距离可达12.5 m(无障碍),数据传输稳定.     

一种基于智能终端的人体心电信号监护系统设计

设计了一种基于智能终端的人体心电信号监测的系统,通过该系统可以实时连续地检测到被监护者的心电信号。该系统主要包括前端心电信号采集模块和后端心电信号无线发送模块。其中前端采集模块对心电信号进行了预处理;后端心电信号发送模块采用蓝牙无线通信方式,从而实现心电数据短距离无线传输且方便与PDA或Android智能手机等手持终端通信,保证了对被监护者的连续实时监测。     

短距离蓝牙通信在智能家居中的应用设计

基于BlueCore3-Multimadie微控制器和无线蓝牙V1．2技术,设计了工作频率在2．4GHz的无线蓝牙转换系统,将无线蓝牙通信具体应用到实际的智能家居环境中,让人们在享受音乐,进行Skype聊天的同时,能够方便快捷地实现固话的转接;极大地方便了人们的生活。     

Design, fabrication and characterization of a high fill-factor micromirror array for wavelength selective switch applications

This paper presents the design, fabrication and characterization of a high fill-factor micromirror array in application of wavelength selective switch (WSS). The micromirror array consists of 52 independent micromirrors. Each micromirror is composed of a cantilever-type micromirror plate (800 μm × 120 μm) with a bumper and an eight-terraced bottom electrode with a limiting plane. A cantilever beam is designed to obtain the rotation angle of micromirror plate and achieve a high fill-factor for the micromirror array. Meanwhile, the bumper and limiting plane are used to prevent the damage possibly caused by the pull-in effect or some vibration instance. An eight-terraced electrode is utilized for reducing the driving voltage. The micromirror array with a high fill-factor in excess of 97% has been successfully achieved using the bulk micromachining technologies. The measured static and dynamic characteristics show that the micromirror can achieve a maximal rotation angle of 0.87° with a Direct Current (DC) driving voltage of 156 V. The turn-on responding time is 0.57 ms, and the turn-off responding time is 4.36 ms. Furthermore micromirror plate can be easily released from the pull-in state without damaged due to the novel bumper design. The switching function between the two output ports of a WSS optical system has also been demonstrated.     

Wireless Face Interface: Using voluntary gaze direction and facial muscle activations for human-computer interaction

The present aim was to investigate the functionality of a new wireless prototype called Face Interface. The prototype combines the use of voluntary gaze direction and facial muscle activations, for pointing and selecting objects on a computer screen, respectively. The subjective and objective functionality of the prototype was evaluated with a series of pointing tasks using either frowning (i.e., frowning technique) or raising the eyebrows (i.e., raising technique) as the selection technique. Pointing task times and accuracies were measured using three target diameters (i.e., 25, 30, 40 mm), seven pointing distances (i.e., 60, 120, 180, 240, 260, 450, and 520 mm), and eight pointing angles (0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°). The results showed that the raising technique was faster selection technique than the frowning technique for the objects that were presented in the pointing distances from 60 mm to 260 mm. For those pointing distances the overall pointing task times were 2.4 s for the frowning technique, and 1.6 s for the raising technique. Fitts’ law computations showed that the correlations for the Fitts’ law model were r = 0.77 for the frowning technique and r = 0.51 for the raising technique. Further, the index of performance (IP) value was 1.9 bits/s for the frowning technique and 5.4 bits/s for raising the eyebrows technique. Based on the results, the prototype functioned well and was adjustable so that two different facial activations can be used in combination with gaze direction for pointing and selecting objects on a computer screen.     

基于MCF51QE128的SD卡接口设计

SD（Secure Digital）卡是一种基于闪存技术的可移动存储设备,由于其体积小、功耗低、容量大且成本低,广泛应用于各类小型便携式电子设备中。本文实现了SD卡与Freescale公司的32位低功耗微控制器MCF51QE128之间的软硬件接口设计,可作为数据记录仪、媒体播放器和录音设备等的设计参考。     

基于HCI状态机的蓝牙无线通信系统模型

蓝牙是一种短距离无线通信的技术规范。分析了蓝牙协议栈中主机控制器接口(HCI)的重要地位和主要功能,介绍了基于HCI的蓝牙应用系统的开发方式。文章详细分析了基于蓝牙模块的数据通信系统构成,着重介绍了使用HCI状态机的处理机制来实现HCI驱动的方法。依据蓝牙无线通讯系统模型,介绍了单片机与PC机蓝牙通信的应用实例,证实了该系统模型稳定可靠。     

蓝牙技术在地下水监测系统中的应用

利用蓝牙设备无线通信的特点,将蓝牙无线传输技术与监测技术相结合,应用到地下水监测技术中,提出了基于蓝牙的无线通信解决方案。方案给出了硬件设计,硬件包括采集、记录和传输;软件设计：数据采集和蓝牙通信。此方案能够实现短距离内数据的无线传输,具有较强的可靠性与较快的数据传输速度。     

Improvement of jitter transfer characteristics of a 9.95328 Gb/s data recovery DLL using saw filter

This paper presents a design of a high-speed data recovery circuit for non return zero (NRZ) data transmission using delay-locked loop (DLL) with SAW filter. The jitter generation of the circuit is decreased by adjusting the loop gain in DLL whereas surface acoustic wave (SAW) filter with low centered frequency (f_c) improves the jitter transfer function of DLL. It is seen that the circuit using SAW filter of f_c = 1.24416 GHz and Q = 1000 provides the cut off frequency of about 600 kHz which is ∼10 times lower than that of conventional DLL circuit.