基于IEEE802．15．4／ZigBee的语音通信系统

提出一种基于IEEE802.15.4的无线传输方案,该方案基于Chipcon公司开发的一款符合ZigBee标准的低功耗射频芯片CC2420,设计了以MSP430为处理器、CC2420芯片为无线通信芯片的无线语音通信系统。使用的外围器件少,实现了短距离无线语音传输和方波输出的双向数据传输,并通过正弦波实验进行代码调试,具...     

基于CC2430的串口无线模块的设计

论述了基于CC2430收发器的串口无线模块的硬件设计和软件设计,并介绍了CC2430的基本特性,讨论了对电磁场干扰的抑制措施.     

基于CC2430的无线传感器网络系统设计

介绍一种基于CC2430的无线传感器网络系统设计,它以CC2430为核心,用于监控温湿度、红外线强度、光照度的无线传感器网络。给出了系统的总体结构、硬件电路、软件设计以及电路板、数据结果。     

基于ZigBee的无线数据采集系统的设计

以C8051F020和射频芯片CC2430为核心设计了低功耗的无线数据采集系统,介绍了ZigBee技术,并给出了基于ZigBee的无线数据采集系统的组成.最后通过使用CC2430芯片完成了采集节点,主控单元的硬件与软件设计,实现了数据的采集和无线传输.     

基于TinyOS的CC2430无线数据收发的设计

为解决现有CC2430无线数据收发程序代码量庞大,结构不清晰,关键源码不公开等问题,提出一种基于TinyOS的CC2430无线数据收发设计方案.在分析CC2430 性能的基础上,设计一种基于DMA的节点收发机制,配置DMA的源和目的地址寄存器、数据长度寄存器以及触发模式寄存器,并根据DMA操作流程给出数据发送和接收流程图.基于TinyOS的组件结构,给出了包括DMA数据收发、简单MAC协议、定时器和串口的组件配置文件.编译结果表明该方法结构简单,占用RAM为11字节,占用程序空间少于7 KB.在CC2430节点上的运行结果表明在节点通信范围内,在各种网络负载下节点间数据收发成功率和正确率均达到100%.     

基于TinyOS的CC2430无线数据收发的设计

为解决现有CC2430无线数据收发程序代码量庞大,结构不清晰,关键源码不公开等问题,提出一种基于TinyOS的CC2430无线数据收发设计方案。在分析CC2430性能的基础上,设计一种基于DMA的节点收发机制,配置DMA的源和目的地址寄存器、数据长度寄存器以及触发模式寄存器,并根据DMA操作流程给出数据发送和接收流程图。基于TinyOS的组件结构,给出了包括DMA数据收发、简单MAC协议、定时器和串口的组件配置文件。编译结果表明该方法结构简单,占用RAM为11字节,占用程序空间少于7KB。在CC2430节点上的运行结果表明在节点通信范围内．在各种网络负载下节点间数据收发成功率和正确率均达到100％。     

基于CC2430片内温度传感器的温度监测系统

为了实现温度的实时监测,提出了一种基于CC2430片内温度传感器的温度监测系统,并对系统的硬件和软件进行了详细的分析和设计.无线传输节点采用了TI公司的单芯片无线通信模块CC2430+低功耗RF前端CC2591,利用CC2430的片内温度传感器实现了温度采集,修改并移植了TI公司ZigBee2006协议栈Z-Stack1.4.2-1.1.0.结合上位机软件显示接收到的数据,实现了温度异常报警,达到了实时监测的目的.     

基于CC2430的无线温度检测终端的设计

介绍了无线射频芯片CC2430和一线数字温度计DS1822的结构和功能;设计了一种无线温度检测终端。该终端以基于Z igBee技术的无线射频芯片CC2430为中央控制器,集成于该芯片内部的MCU不仅负责控制DS1822,而且还负责控制芯片内部的射频电路。该终端能实时响应管理中心的命令,并通过DS1822实现对环境温度的实时检测。利用多个此类终端可对较大环境进行实时、无线、多点的温度检测。     

基亏ZigBee技术的智能校园无线温度采集系统

提出了一种基于ZigBee技术的智能校园无线温度采集系统的软件和硬件电路设计方案。以CC2430和STC90LE58AD40I为核心,采用DSl8820温度传感器获取数据,基于TI／Chipcon公司免费提供的ZigBee2006协议栈,在IAR Embedded Workbench集成开发环境中进行编译,实现了无线温...     

TinyOS移植技术分析及在CC2430平台的应用

简述了无线传感器网络操作系统及传感器节点的基本状况,并从设计思路、体系结构、运行原理及编译过程等方面详细分析了当前主流的操作系统TinyOS的主要特点。在此基础上,提出了TinyOS的移植方法以及具体实现过程。最后,将TinyOS成功地移植于CC2430平台。实验结果表明,移植后的TinyOS可以稳定地运行于CC2430平台,并能可靠地实现传感器之间的无线组网。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.