嵌入式无线移动通信系统的研究与开发

为降低嵌入式无线移动通信系统的硬件开销和高效地开发嵌入式网络协议,构建了基于8位低端微控制器的嵌入式无线移动通信终端,同时根据软件工程原理,在系统实现中提出了以框架设计模式开发嵌入式网络协议的思想,实现了一个生成网络协议的通用框架,它采用UML状态机技术,将嵌入式网络协议的UML状态图转换为网络协议的实现代码.实验结果表明,该系统不仅极大地降低了对硬件资源的需求,UML状态机技术也为嵌入式系统软件的开发带来了规范性和高效率.     

iOS系统代码签名机制研究

代码签名(Code Signing)机制是iOS系统安全机制中非常重要的一种,该机制在应用程序运行之前检测其是否通过了苹果的签名,从而让恶意软件很难在iOS上运行。这里通过对iOS内核的研究,向读者介绍iOS的代码签名机制的实现原理与运行机制,然后分析了Mobile Safari的执行机制和特殊性,通过阐述Mobile Safari的JIT机制来说明代码签名(Code Signing)是如何伴随着iOS的发展逐步走向完善的。     

基于Android移动终端短信监控系统的设计与实现

提出了基于Android移动终端的短信监控系统,实现了通过短信对系统手机(远程Android移动终端)进行事先约定的监控,以获取系统手机相关信息的功能.在系统手机上安装该系统并注册监听号码和监听密码,当监控手机向系统手机发送指令短信时,该系统的短信监听模块捕捉短信,分离来信号码和内容,并分别与注册在SQLite数据库中的注册记录比对,若匹配成功则回复提示信息,监控手机按照提示内容发送需要获取的信息代码,系统手机最后根据代码回复监控图像、位置、未接来电、未查短信、联系人等信息.通过测试,本系统的有效性得到了验证.     

基于AT指令与CDMA数据终端的通信系统研究

应用系统开发中,通过与其它接口或硬件结合来提升整体软件的功能,为客户使用提供更加合理的解决方案.此通信系统是通过基本的AT指令与CDMA Modem结合,用Java语言进行开发,实现短信的收发功能,将系统与实际应用结合;这里介绍实现此功能的关键代码和流程,以及在实际开发过程中遇到的问题,并结合以往的GSM Modem,比较二者在开发中的异同.     

J2EE基于Struts和Hibernate框架的新闻发布系统分析与设计

以J2EE为基础,对Struts和Hibernate框架分别进行深入剖析,研究分析二者的整合集成技术,并对开发所使用的MVC设计模式和MySQL数据库简要介绍。通过引入新闻系统实例讨论了Struts框架对系统的表示层、业务层和数据层的分离作用,以及Hibernate对系统数据持久化的作用。经过实际测验,该系统易实现代码的重用和修改,具有良好的灵活性、稳定性和扩展性。     

开发支持多协议的短信应用平台

本文采用面向对象的思想,通过遵循面向对象的核心原则,应用适当的设计模式,设计和开发与具体协议无关的短信应用平台。     

短信超高速下发的解决方案

本文通过对目前山西移动短信提醒平台进行升级优化,从系统架构调整和业务逻辑控制两方面进行改造:引入队列和线程池,提高接口处理效率,同时进行短信流量阀值控制,减少中间环节和数据协议转换过程,实现了大容量短信的超高速下发.     

设计模式在业务逻辑层中的应用

传统的软件应用系统一般采用3层应用框架,业务逻辑层代码中混杂各种数据库调用语句,严重影响系统的可扩展性、可复用性、可维护性.从设计模式考虑,提出从业务逻辑层分出数据接口层,负责与数据层沟通,实现业务逻辑层与数据层的真正独立.提高系统的可扩展性、可复用性和可维护性,并通过具体应用实例实现数据访问对象(DAO)设计模式.     

设计模式在卫星计划编制软件中的应用

介绍了卫星计划编制软件的功能和设计模式的基本概念,将设计模式引入软件设计,以Adapter模式、Strategy模式和Singleton模式为例论述了设计模式在卫星计划编制软件中的应用,通过实践证明运用设计模式能够优化软件的设计,提高开发效率和软件质量。     

Notify设计模式在仓储管理系统中的应用

设计模式是对过去成功经验的总结，是解决某类问题的方法论。使用设计模式使人们可以更加简单方便地复用成功的设计和体系结构，更好地实现代码的重用和维护，在开发过程中，使用设计模式还可大大降低因技术原因造成的开发失败的风险。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

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.     

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.     

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.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.