一种基于DPI的OTT盒子智能分析方案

互联网上OTT终端规模已达到亿级的规模,这对公司的"和TV"业务带来了巨大的竞争影响。另一方面,如此庞大的业务需求对宽带质量的要求更高,OTT盒子使用的感知体验直接影响用户家宽满意度评价。基于此,文章特提出一种基于DPI的OTT盒子智能分析方案,该方案采用统一DPI自定义识别库加载,新增单据的终端类型字段,实现终端的识别;另一方面引入智能图片识别技术,实现盒子资源和质量的探测。     

基于XDR大数据分析的高架用户识别技术

城市高架路场景下,用户行驶速度相对较快、人流密集,客户对通信体验要求更高。首先,介绍了网络质量管控大数据平台体系架构;其次,设计了基于XDR大数据分析的高架用户识别的算法;最后,通过XDR大数据分析处理,与高架路段指纹库匹配,输出高架用户运动轨迹,提升了高架用户识别准确性,为高架路无线网络质量监控提供辅助支撑。     

基于Unix系统的XDR文件解析及应用

在网络环境中不同的体系结构之间，需要经常性地传输和处理数据，由于XDR采用一种与体系结构无关的方式进行数据结构的封装，就可以克服在数据传输和处理过程中数据格式不一致的矛盾。本文通过对XDR的编码和解码规则的分析，最终在64位UnixAIX系统中实现了XDR文件的解析，并在交易数据采集和处理系统中得到了广泛的应用。     

High Catalytic Efficiency of a Nanosized Copper-Based Catalyst for Automotives: A Physicochemical Characterization

The global trend in restrictions on pollutant emissions requires the use of catalytic converters in the automotive industry. Noble metals belonging to the platinum group metals (PGMs, platinum, palladium, and rhodium) are currently used for autocatalysts. However, recent efforts focus on the development of new catalytic converters that combine high activity and reduced cost, attracting the interest of the automotive industry. Among them, the partial substitution of PGMs by abundant non-PGMs (transition metals such as copper) seems to be a promising alternative. The PROMETHEUS catalyst (PROM100) is a polymetallic nanosized copper-based catalyst for automotives prepared by a wet impregnation method, using as a carrier an inorganic mixed oxide (CeO₂-ZrO₂) exhibiting elevated oxygen storage capacity. On the other hand, catalyst deactivation or ageing is defined as the process in which the structure and state of the catalyst change, leading to the loss of the catalyst’s active sites with a subsequent decrease in the catalyst’s performance, significantly affecting the emissions of the catalyst. The main scope of this research is to investigate in detail the effect of ageing on this low-cost, effective catalyst. To that end, a detailed characterization has been performed with a train of methods, such as SEM, Raman, XRD, XRF, BET and XPS, to both ceria–zirconia mixed inorganic oxide support (CZ-fresh and -aged) and to the copper-based catalyst (PROM100-fresh and -aged), revealing the impact of ageing on catalytic efficiency. It was found that ageing affects the Ce–Zr mixed oxide structure by initiating the formation of distinct ZrO₂ and CeO₂ structures monitored by Raman and XRD. In addition, it crucially affects the morphology of the sample by reducing the surface area by a factor of nearly two orders of magnitude and increasing particle size as indicated by BET and SEM due to sintering. Finally, the Pd concentration was found to be considerably reduced from the material’s surface as suggested by XPS data. The above-mentioned alterations observed after ageing increased the light-off temperatures by more than 175 °C, compared to the fresh sample, without affecting the overall efficiency of the catalyst for CO and CH₄ oxidation reactions. Metal particle and CeZr carrier sintering, washcoat loss as well as partial metal encapsulation by Cu and/or CeZrO₄ are identified as the main causes for the deactivation after hydrothermal ageing.     

网元性能及业务数据特征精准分析方法

传统的网络性能分析以及业务数据分析,都是通过网管KPI 确定的,网络指标出现异常则需要根据优化人员经验进行问题定位。对问题定位的效率取决于技术人员的水平,同时网络业务数据特征的分析粒度也很粗,不能精细化、全面化、多样化地分析用户特征。随着统一DPI系统的引入,展示了用户会话过程中涉及的最细粒度的业务状态以及网络信道质量。为了更加准确地反映小区网络质量和用户真实业务体验,所研究的网元性能及业务数据分析方法采用数据切片和关联的方式,更加精细化地将体现网络质量的控制面信令XDR（X data recording,呼叫数据记录的扩展）数据和用户面业务XDR数据关联在一起分析。实现分应用、分业务拓展的用户感知分析,明确质差用户或场景等情况下XDR的数据特征,从而提升网络优化效率、提高用户感知。     

互联网业务质量智能拨测分析系统的研究及应用

4G网络的快速发展,带来了移动互联网数据业务的爆发式增长,XDR信令数据每天8T,业务子类十万以上,所以对数据业务质量的监控变得愈发重要。本文通过对端到端全业务信令信息的采集梳理和重要的域名进行判断,设计开发了智能互联网业务质量拨测分析系统。首先采集了全网的XDR信令并形成分析系统,采用Java语言编写到每个URL的拨测程序。两者相互协作,分析得到的质差URL通过拨测系统验证,拨测系统得到的质差URL返回分析系统分析。拨测软件能方便快捷地配置到各类型的拨测终端上,其单进程每秒1000次的高并发能力也能很好的满足测试需求。数据的分析效率提高70%以上,并能及时发现质差的URL,第一时间处理用户投诉,提高用户感知。     

卫星通信系列讲座之十三先进极高频(AEHF)卫星

作为美国第三代军事卫星通信系统,AEHF将继承和发展前两代军事星的特点,在未来为美国军方提供受保护的卫星通信。文中主要介绍了AEHF系统的组成和功能,给出其主要技术指标,并分析了卫星即将采用的关键技术,最后指出了它能够提供的各种业务类型和主要应用。     

Novel Carboxylic Acid-Capped Silver Nanoparticles as Antimicrobial and Colorimetric Sensing Agents

The present work reports the synthesis, characterization, and antimicrobial activities of adipic acid-capped silver nanoparticles (AgNPs@AA) and their utilization for selective detection of Hg²⁺ ions in an aqueous solution. The AgNPs were synthesized by the reduction of Ag⁺ ions with NaBH₄ followed by capping with adipic acid. Characterization of as-synthesized AgNPs@AA was carried out by different techniques, including UV–Visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Dynamic Light Scattering (DLS), and zeta potential (ZP). In the UV–Vis absorption spectrum, the characteristic absorption band for AgNPs was observed at 404 nm. The hydrodynamic size of as-synthesized AgNPs was found to be 30 ± 5.0 nm. ZP values (−35.5 ± 2.4 mV) showed that NPs possessed a negative charge due to carboxylate ions and were electrostatically stabilized. The AgNPs show potential antimicrobial activity against clinically isolated pathogens. These AgNPs were found to be selectively interacting with Hg²⁺ in an aqueous solution at various concentrations. A calibration curve was constructed by plotting concentration as abscissa and absorbance ratio (A_Control − A_Hg/A_Control) as ordinate. The linear range and limit of detection (LOD) of Hg²⁺ were 0.6–1.6 μM and 0.12 μM, respectively. A rapid response time of 4 min was found for the detection of Hg²⁺ by the nano-probe. The effect of pH and temperature on the detection of Hg²⁺ was also investigated. The nano-probe was successfully applied for the detection of Hg²⁺ from tap and river water     

先进极高频（AEHF）卫星

作为美国第三代军事卫星通信系统，AEHF将继承和发展前两代军事星的特点，在未来为美国军方提供受保护的卫星通信。文中主要介绍了AEHF系统的组成和功能，给出其主要技术指标，并分析了卫星即将采用的关键技术，最后指出了它能够提供的各种业务类型和主要应用。     

一种基于Kettle的数据核查方法

早期的家宽业务分析,主要依托传统网管或拨测系统开展工作,用以监视业务质量,这种分析方法,无论是在质量评估还是用户的真实体验方面,都存在一些不足。只有从客户源头获得第一手信令数据,后台进行精细化分析,才能更好地找准用户投诉的根本原因。基于此,文章提出一种基于Kettle的数据核查方法,实现了大批量数据的分析处理,完成了从文件扫描到话单关联一系列的完整数据处理流程。