嵌入式移动系统GIS的引擎开发

许多嵌入式移动系统能够运用GIS图形在终端设备上显示对象的空间位置.基于GIS的移动系统如果利用比较通用的GIS引擎来开发可以节约时间、降低成本、方便维护.GIS引擎支持不同的地理管辖区域,支持不同类型移动终端,提供必要的工具,支持基于GIS应用的的通用功能.GIS点阵图格元模型、屏幕显示域的定义、屏幕显示域的移动算法及GIS图形自动适应不同类型终端屏幕是实现GIS引擎的重要技术.     

一种实现移动IP的改进方案

随着网络的迅速发展和便携式终端的普及,远程和在线办公已被广泛应用.对于这些无固定位置的便携式终端,或者是在布线极为不方便的环境中,使用动态链路接入互联网将是最明智的选择.在这种接入技术中,移动终端的漫游管理扮演了极其重要的角色.该文首先介绍了如何通过隧道技术实现移动IP,并对其进行了可行性分析,最后提出一种通过端口映射技术实现移动IP的改进方案.     

基于移动终端的语音通话安全专利技术综述

语音通话安全是当前移动通信领域的热点研究课题,本文以移动终端的语音通话安全专利申请作为分析对象,重点分析全球及中国范围内关于语音通话安全的申请信息、专利布局、重要申请人以及技术发展状况等信息.     

移动支付相关技术与专利分析

随着互联网购物高速发展和智能手机的全面普及,移动支付被广泛使用.检索了移动支付的专利申请文件,从专利角度分析了移动支付所采用的各种技术.同时通过对中国移动支付技术的专利申请趋势、专利分布和重要申请人的专利布局进行分析,得出了不同申请人在移动支付领域的研究方向.通过分析,可以了解移动支付所采用的各种技术以及相关公司的专利布局,为该领域的研究方向提供参考.     

探究数字电视广播技术及其应用

近几年,地面数字电视广播发展迅速,在《地面数字电视国家标准》出台后,发展更为迅速.在对数字广播电视技术和这种技术在车载移动电视以及便携式移动终端等具体应用以后,分析了数字广播技术的应用以及在未来的发展趋势.     

移动IP技术3

[编者按]随着无线通信技术和便携式终端技术的快速发展,面向固定网络环境的传统IP技术迫切需要更新,以支持主机在网络中的漫游和移动.     

新闻

政策看版广电总局规范IPTV试验随着数字广播电视技术的发展,通过广播电视覆盖网可以开展移动数字多媒体广播业务,可以向手机、PDA、MP3、MP4、数码相机、笔记本电脑等多种小尺寸屏幕便携式终端提供广播电视节目和信息服务。近日,国家广电总局发布《关于规范移动数字多媒体广播技术试验的通知》,指出,移动数字多媒体广播作为新兴媒体,将成为今后广播电视发展的新的重要领域。为了规范和促进移动数字多媒体广播健康有序发展,广电总局规定各地广电企业在进行移动数字多媒体业务时,必须:     

移动视频广告中国专利状况分析

分别从年度走势、申请类别、申请人省份排名、申请国排名、主要申请人排名等几个方面对移动视频广告中国专利申请状况进行了分析,通过分析指出,移动视频广告的发展虽然迅速但不均衡,且申请人非常分散,手机业务相关厂商非常重视移动视频广告的专利布局,另外,申请人大都采用发明专利的形式申请专利,对广大国内申请人了解该领域的技术或者市场状况都有所帮助.     

苹果和三星在中国移动终端领域的专利分析

分析了苹果公司和三星电子在移动终端领域中的专利申请,对其专利申请趋势、类型,与移动终端相关的多个技术领域的专利布局进行了展示.可以了解到苹果公司和三星电子在移动终端领域的专利分布状况和特点,同时也为其他IT公司,尤其是国内IT公司在研发和专利布局方面提供参考.     

浅析移动终端解锁锁定技术领域专利分析

随着移动互联网技术的发展,基于图形用户界面的人机交互技术的发展也日益壮大.其中,是移动终端解锁锁定技术的发展越来越体现出对于用户良好的操作体验的重视.针对涉及移动终端解锁锁定技术领域的专利申请,进行了关键技术和检索应用的研究.通过关键技术对该领域的重要专利进行分析,对领域内的专利检索进行了分类号比对和关键词扩充,同时给出了实际应用的示例.     

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.     

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.     

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.     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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.