适用于实时查询的电信行业海量数据仓库构建方法

传统的数据仓库不能提供实时查询。本文结合电信行业海量数据的特点,提出一种适用于实时查询的数据仓库构建方法,不仅实现了多维分析功能,还提供了基于ODS的实时查询能力,支撑网络监控、投诉处理等应用需求。     

基于移动网络手机信令的人流量统计系统——信令处理平台模块的设计与实现

实时掌握城市交通枢纽、各大旅游景点的人流量状况,为城市交通规划、旅游景点人力资源配备提供数据支撑已越来越受到相关部门重视。结合北京区域人流量系统项目中移动信令处理基础平台模块提出一种利用现网移动信令数据统计实时人流量数据的架构,该平台已经过北京移动与北京市旅游委、交通局验证,目前在北京移动正式运行。     

流计算大数据技术在运营商实时信令处理中的应用

基于Hadoop搭建的大数据平台采用离线批处理的方式,无法满足对数据实效性敏感的业务要求。针对运营商动态数据信息开放大数据平台的实时信令处理要求,对流式计算大数据组件进行了分析,介绍了与流计算大数据相关的实时采集、汇聚和处理组件,形成了端到端实时信令处理大数据技术解决方案,并提出了融合批处理和实时计算的大数据平台解决方案,提高了网络信令数据的时效性,为业务创新提供更大空间,带来更多利益。     

分布式手机信令数据采集与分析技术研究

针对智能手机端分布范围分散导致的大规模信令数据存储和实时分析处理困难的问题,文中设计了一种基于分布式计算的手机信令数据采集与分析技术方案。基于分布式信令数据采集技术结构,方案集成了4种分布式数据库以实现分布式信令的数据存储。另外,结合Spark技术,所设计的分布式信令数据分析模块可以实时对采集的信令进行分析和整合。该分布式信令数据采集与分析方案可以适用于大规模手机信令数据的采集和处理,为分布式信令监测解决方案的设计提供了参考。     

基于HDFS和IMPALA的碰撞比对分析

处理公共安全大数据需实现查询、全文检索、即时数据推送和内存计算等实时业务分析,而基于Hadoop生态系统建立的Hive不支持海量数据的实时查询,无法实现交互式查询和报表查询快速返回数据结果.针对Hive实时查询的不足,首次将Impala架构应用于公共安全数据处理上,结合Impala实时查询引擎的原理,分析了MapReduce上Hive的实时查询缺陷,比较了Impala和Hive的实时性能,改进了Impala上运行CURE碰撞比对算法,实现了异地数据碰撞比对的分析与展现.本系统的方案在实战应用中取得了较好的效果,可为公安安全领域构建大规模数据处理与分析系统提供技术参考.     

节点交换机与复接器间的控制信令

节点交换机和复接器是野战网中的两项关键设备。本文从分析EB交换机软件出发,总结整理出这两项设备间的管理信息,包括设备识别过程、连接状态提取过程、复接器编程数据修改、交换机对复接器编程、状志查询过程和测试过程,并详细介绍了完成上述过程的信令收发技巧和处理方法。本文的信令过程对于编制两设备间的控制信息标准提供借鉴,信令处理方法和技巧对日后的设备研制和改进也有参考价值。     

信令监测系统共享平台业务订阅模块的设计

针对电信运营商的运营维护的要求,对信令监测系统的技术特点以及功能需求进行了研究,提出了一套信令监测系统共享平台的整体设计方案,对业务信令数据订阅模块的消息字段、通信流程进行了详细的设计,并且编码实现了其功能。测试表明,该业务信令数据订阅模块能够完成第三方平台对信令监测系统业务信令资源列表的查询、业务信令数据的订阅以及信令数据的传送,具有较好的实用价值。     

IMS网络信令流程的可视化展现及故障分析技术研究

介绍了信令可视化展现工具的研制方法:通过抓取IMS网络呼叫会话建立过程中的各网元产生的实时信令数据,再通过解析算法,将信令数据包转换为图形化信令流程图;介绍了运维人员通过查询呼叫会话的流程图可方便直观的了解IMS网络的呼叫状况,尤其是在呼叫出现故障的环节采用描述性文字描述故障原因,而不是故障代码;还介绍了一种故障分析的方法:借助信令可视化工具,结合故障自助申报、故障例测计划编排及故障分析等模块,实现通信网络故障前、中、后的三维全景覆盖。借助这两个方法的帮助,运维人员可及时掌握通信网络的运行状况,提高运维水平,减轻运维压力,增加IMS系统安全可靠性。     

基于IP承载的语音信令监测系统中A接口监测方法的研究

对基于IP承载的语音信令监测系统的总体架构进行了介绍,通过研究A接口协议栈,提出了采用分层结构、模块化设计思想的A接口监测方案。重点对信令处理平台中解码模块、合成模块、静态表查询模块和出表统计模块进行了介绍,最后通过现网数据的验证,证实了该监测方法的有效性和正确性。     

成都联通WCDMA掉话感知指标多维度分析

结合成都联通的实际用户数据,通过海量数据管理、实时数据挖掘技术、高效资源管理和分析技术,开展GPEH信令数据专题应用研究,对WCDMA掉话感知指标采取了创新性的多维度信令数据分析方法,实现可充分掌握投诉用户、重点关注用户的网络感知情况,并提出相应的解决方案.     

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.     

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.     

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.     

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.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Call for Papers

正Communications—VLSI Researches and industries of telecommunications have been growing rapidly in the last 20 years and will keep their high growing pace in the next decade.The involved researches and developments cover mobile communications,highway and last-mile broadband communication,domain specific communications,and emerging D2D M2M communications.Radio communication steps into its