Rest API技术概要及在移动通信网络管理中的应用分析

本文介绍了目前最炙手可热的REST架构风格,该风格顺应WEB2.0的兴起,完美的匹配了云计算时代来临的可扩展要求,在各种应用场景中都得到了充分的表现。根据其技术特点,本文分析了该风格的API在移动通信网络管理中的应用,从网管系统内部、网管系统之间以及网管系统与上层APP应用之间等多方面对是否适用于REST风格以及如何在合适的位置使用REST API进行了分析。     

电信API：轻量级模式、重量级功能

在通信产业正从导入期向拓展期演进的今天,面对用户消费模式的变迁大潮,面对互联网的骨灰级创新模式以及新媒体的广泛传播,运营商正在采取一种积极的融合、开放的态度,努力尝试开放其电信能力,集思广益,发挥第三方企业与个人的创新能力,打造丰富的增值应用。另一方面,运营商也希望借用这种电信服务的二次分发渠道,促进基本电信服务的销售。爱立信（中国）通信有限公司的《电信API：轻量级模式、重量级功能》一文介绍了两种类型的电信能力开放方案（ParlayX与REST模式）,并比较了二者的优劣。为应对电信能开放的趋势,爱立信已经推出相关产品：业务能力开放网关（SIG）,支持以REST或SOAP方式开放API。基于SIG解决方案,爱立信推出了WebIMS业务平台,将IMS通信能力与业务引擎以REST风格的OpenAPI对用户和第三方应用开发者开放。爱立信的SIG,WebIMS解决方案已经在全球范围内获得运营商的广泛认可。     

Web技术在电信网管系统中的应用

长途网、本地网和No.7信令网等系统的网管数据的日渐增多，使得满足管理层需求的数据的处理过程越来越复杂、用时也越来越长，因此亟需建立一个统一的、综合的网管系统。陕西省电信网管中心从实际出发，利用Web技术在原来３个独立的网管系统的基础上构建了一个综合网管系统。随着网络和Web技术的发展，综合网管系统也在逐渐完善，该系统主要经历了静态Web应用、动态Web应用和智能Web应用３个阶段。１静态Web技术应用阶段利用网络和Web技术，将网管分析结果通过网络以Web形式发布，即将所有的网管分析结果全部存放在Web服务器上，用户通…     

基于REST架构风格的云物理服务器部署机制

全球云计算市场快速平稳增长,越来越多的企业和科研机构将应用部署在公用云计算平台上。但是有部分应用在虚拟云主机上运行时的效率很低或根本无法运行,为解决这个问题,提出了基于REST架构风格的云物理服务器部署机制,通过该机制可以将这类应用直接部署在云物理服务器上。在服务器端借助Cobbler控制物理服务器,并基于REST架构风格对Cobbler服务器进行了二次开发和封装,通过调用相应的REST接口,Web服务器可以与Cobbler服务器进行交互,实现了用户通过Web管理面板对云物理服务器的完全控制。在真实环境下对该部署机制进行了测试,实现了预期的设计目标。     

电信级网管系统的度量方法及其应用策略探讨

随着集中化电信网络维护要求的不断提高，建立电信级网管系统已迫在眉睫。本文针对电信级网管系统的构建在可用性方面还缺乏统一的度量方法以及相应的应用策略，分析了传统可用性度量方法，探讨了基于服务级别的可用性度量方法建立电信级网管系统的应用策略。     

基于Windows NT实现SNMP扩展代理的研究

描述了Windows简单网管协议(SNMP)的几个重要特性，并对Windows SNMP代理服务和SNMP应用编程接口(API)交互以及trap和管理应用的交互过程进行了详细分析研究，最后，介绍了基于NT的SNMP扩展代理的实现。     

基于AIOps的网管智能运维研究与实践

随着5G、云计算和微服务等技术的发展，网管系统结构复杂性和技术组件多样性愈发提高，传统运维手段已无法满足监控和运维要求，因此基于AI和大数据技术的AIOps应运而生。本文通过分析AIOps国内外研究现状和网管运维现状痛点，研究网管运维指标异常检测和故障预测能力的技术实现。基于微服务架构搭建AIOps运维平台，引入AI技术，提升网管运维智能化能力。同时平台能力以API等方式与网管工作台集成，提供AIOps能力引擎，为网管运维系统提供智能化告警监控视图。总体使网管智能运维水平达到新高度，极大降低了故障发生率。     

江苏电力通信网网管系统的建设与应用

介绍了江苏电力通信网管系统的组成，分析了该系统的体系结构及系统功能，说明了该系统的应用情况和今后的发展方向。     

PHS基站网管系统的开发与建设

本文主要介绍北京通信无线市话PHS基站网管系统的开发和系统建设情况.内容包括该网管系统的开发背景、网管功能、体系结构以及应用前景的预测.     

基于SNMP协议的网络系统资源监控应用

针对目前国内中小型网络的网络管理需求，本文对SNMP协议框架、网管系统的体系结构及网管应用进行分析研究，介绍了根据新的体系结构开发的系统资源监控系统，并对该系统从设计到功能实现进行了详细的论述。     

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.