爱立信:用大数据提升运营商NPS

2015年世界移动通信大会(MWC)期间,爱立信发布了大数据分析套件Expert Analytics 15.0。这套方案可以帮运营商预测NPS,并且提出改进方案。NPS是目前最流行的客户忠诚度分析指标,用以计量客户向其他人推荐企业业务的可能性。在同一个用户调查样本中,业务推荐者的比例减去业务贬损者的比例,即为NPS。苹果、飞利浦等公司很早就启动了NPS考核,并将其视为"未来利润"。对当前的运营商而言,更高的NPS不仅意味着领先于其他运营商,同样也     

NPS用户群网络感知保障运营体系研究

介绍当前用户网络感知问题及解决手段,提出一种提升NPS(净推荐值)用户群网络感知的综合解决方案。创新建立一种客户感知Qo E(体验质量)得分模型,从用户控制面与业务面建立用户对网络感知的得分体系。同时提出一种NPS识别模型,实现NPS网络感知闭环管理流程,通过挖掘Qo E得分低的NPS质差用户,聚类用户共性问题。针对指标劣化产生的告警,深入分析原因并协助维护人员和厂家快速定界定位问题,提升客户网络感知。     

浅析NPS顾客忠诚度测评法

面对移动互联网的飞速发展,用户消费行为发生了巨大的变化,加之产品同质化与市场相对饱和,如何提升客户忠诚度摆在了运营商的面前。文章通过介绍NPS体系,了解NPS的优点,并将NPS与实际工作相结合,提出运营商NPS提升策略,以提高客户忠诚度,促进企业良性发展。     

蒸发波导模型与微波超视距传播试验对比

海洋蒸发波导是实现近海面超视距电波传播的重要环境,利用蒸发波导模型和电波传播数值算法是获取路径损耗的主要途径.基于海上平台约7个月测量的水文气象参数,对比了Paulus提出的PJ模型和美国海军研究生院(Naval Postgraduate School,NPS)提出的NPS模型,同时利用约1个月的海上超视距传播测试数据...     

ULSI互连中纳米多孔SiO_2的制造工艺、特性及应用前景

综述了 ULSI互连中纳米多孔二氧化硅 (NPS)电介质主要品种干燥凝胶 (Xerogel)的典型制造工艺 ,给出并分析了介电常数、应力、热导率和机械强度等主要特性 ,最后评述了有关应用前景     

令牌环(Token ring)打印服务器

AFP Solutions公司推出了为令牌环网络设计的两种小型的多协议打印服务器:Axis NPS 630和NPS632。这两种打印服务器直接插入打印机的并行口,将单机使用的打印机转变成多协议的网络打印机,从而能     

Al薄膜对(002)ZnO/Al/Si结构基片中ZnO薄膜特性影响的实验研究

采用射频磁控溅射法沉积制备了(002)ZnO/A l/Si复合结构。研究了Al薄膜对(002) ZnO/Al/Si复合结构的声表面波器件(SAWD)基片性能影响以及当ZnO 薄膜厚度一定时的Al膜最佳厚度。采用X射线衍射(XRD)对Al和ZnO薄膜进行了结构表征 ,采用 扫描电镜(SEM)对ZnO薄膜进行表面形貌表征,并从薄膜生长机理角度进行了分析。结果 表明,加Al薄膜有利于ZnO薄膜按(002)择优取向生长,并且ZnO 薄膜的结晶性能提高;与(002)ZnO/Si结构基片相比,当Al薄膜 厚为100nm时,(002)ZnO/Al/Si结构中ZnO薄 膜的机电耦合系数提高 了65%。     

适用SAW器件的ZnO/Ti/Si薄膜制备及缺陷分析

在Si(100)衬底和Ti/Si(100)衬底上分别制备了ZnO薄膜,探讨了Ti缓冲层对ZnO薄膜结构和缺陷的影响,利用X射线衍射(XRD)测试了ZnO薄膜的晶体结构及择优取向,利用原子力显微镜(AFM)观察ZnO薄膜的表面粗糙度(RMS),利用光致发光(PL)光谱检测了ZnO薄膜的缺陷,利用四探针法测试了ZnO薄膜的电阻率。结果表明,在Ti/Si(100)衬底上、衬底温度350℃的条件下,制备的ZnO薄膜表面光滑、缺陷少、电阻率高且具有高C轴取向。本文这一工作对于压电薄膜缺陷分析及高性能ZnO的声表面波(SAW)器件研制有重要意义。     

(100)取向AlN薄膜的制备及其压电性能研究

采用射频磁控溅射法,在Si(100)衬底(含Au导电层)上制备了(100)取向的AlN薄膜并研究了工作压强和溅射功率对制备的AlN薄膜性能的影响。利用X射线衍射仪(XRD)分析了薄膜结构特性,结果表明,在一定范围内,工作压强的增加和溅射功率的减小更有利于AlN(100)晶面择优取向的生长。利用压电力显微镜(PFM)对AlN薄膜的形貌和压电性能进行了表征,发现(100)择优取向的AlN薄膜的压电性主要表现在薄膜面内方向上。     

氧气压强对Si基片上沉积YIG薄膜微观结构和磁性的影响

本文研究了氧气压强对用脉冲激光沉积技术(PLD)在Si(100)基片上制备的YIG薄膜性能的影响。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、震动样品磁强计(VSM)、铁磁共振仪(FMR)等检测了薄膜微观性能及磁性。研究发现:(1)在0.3Pa和1Pa下制备的YIG薄膜中没有杂相,而在4Pa和16Pa的薄膜中出现了YIP相;(2)薄膜的晶粒尺寸随氧压增大而减小;(3)在1Pa下制备得到的薄膜共振线宽最小,为91Oe;(4)薄膜饱和磁化强度(Ms)随氧压的增加而降低,1Pa下得到的薄膜的Ms为138Oe,最接近理论值。     

Techniques to improve the accuracy and to reduce the variance in noise power spectrum measurement

Several techniques to increase the accuracy and to reduce the variance of the noise power spectrum (NPS) measurement for digital X-ray imaging systems are investigated. These techniques include: 1) averaging the outputs from subblocks of the entire image; 2) averaging the two-dimensional NPS data along a circular route centered on the origin of spectral domain; and 3) masking a window function on each subblock before Fourier transforms. Techniques 1) and 2) are used mainly to reduce the variance of the NPS measurement. Technique 3) serves to improve the accuracy of the final result. Experiments with two different charge-coupled device-based X-ray imaging systems demonstrated that the precision and accuracy of the NPS measurement could be significantly improved using these techniques. The impact of the image partition for averaging is discussed and the corresponding NPS estimations are presented for the number of subblocks ranging from 4 to 64. The effect of masking on the NPS is also studied using four different window functions.     

Monitoring of polyethylene wear in nonmetal-backed acetubular cups by digitized anteroposterior pelvic radiography

The aim of this study was to assess polyethylene wear in a total hip prosthesis by digitized radiography of the whole pelvis in the anteroposterior (AP) plane. The three-dimensional (3-D) pose of the nonmetal-backed acetubular cup, materialized by its metal ring and the femoral head made of metal or ceramic, was estimated using iterative algebraic algorithms with inner bias correction and bootstrapping for variance reduction. Points of interest were obtained by maximizing the correlation between sampled density profiles and 3-D geometric models degraded by the modulation transfer function (MTF) of the radiographic system and the film scanner. The error in the maximal correlation estimate were inferred from noise power spectra (NPS) and allowed the calculation of the point covariance matrix. Both NPS and MTF were modeled for each stage and estimated using least-square fitting of the overall NPS model to the autospectral density function calculated in stationary regions. Comparison of the radiographic time series was made possible by the high accuracy level and 3-D matching from the cup orientation. The feasibility of the full 3-D measurement, the assumption of negligible lateral wear and its influence on AP wear are discussed on simulated and real radiographic data.     

The impacts of speed-to-market on new product success: the moderating effects of uncertainty

Time-based strategy is becoming an important weapon to achieve competitive advantage in the current environment of fast-changing technology and customer requirements. Speed-to-market has become the mantra of both researchers and practitioners in new product development (NPD), but there are limited and conflicting findings on the relationship between speed-to-market and product success. A more important question is whether faster is always better. In a study of 692 NPD projects, we examined the relationship between speed-to-market and new product success (NPS) under different conditions of uncertainty. Our results indicate that speed-to-market is generally positively associated with overall NPS, but market uncertainty moderates the direct effect. Speed-to-market is less important to NPS under conditions of low market uncertainty. Our results also suggest that technological uncertainty does not affect the speed-success relationship. The implication is that it is more important to execute a time-based strategy in an unfamiliar, emerging, or fast-changing market than in a familiar, existing, and stable market. The limitations and future research related to these results are discussed.     

Computational engine for development of complex cascaded models of signal and noise in X-ray imaging systems

The detective quantum efficiency (DQE) is generally accepted as the primary metric of signal-to-noise performance in medical X-ray imaging systems. Simple theoretical models of the Wiener noise power spectrum (NPS) and DQE can be developed using a cascaded-systems approach to assess particular system designs and establish operational benchmarks. However, the cascaded approach is often impractical for the development of comprehensive models due to the complexity and extremely large number of algebraic terms that must be manipulated to describe signal and noise transfer. We have developed a computational engine that overcomes this limitation. Using a predefined library of elementary physical processes, complex models are assembled and input-output relationships established using a graphical interface. A novel recursive algorithm is described that allows the signal and noise analyses of models with arbitrary complexity including the use of multiple parallel cascades. Symbolic mathematics is used to develop analytic expressions for the NPS and DQE. The algorithm is validated by manual calculation for simple models and by Monte Carlo calculation for complex models. We believe our approach enables the use of complex cascaded models to design better detectors with improved image quality.     

Channel assignment for initial and handoff calls to improve the call-completion probability

The paper focuses on how to assign channels for initial and handoff calls. Previous schemes give priority to handoff calls by queuing handoff calls, reserving some channels for handoff calls, or subrating existing calls for handoff calls. We queue both initial and handoff calls. We take this idea from derivations of the optimal value for an approximation to the call-completion probability. Our goal is to have higher call-completion probability and still keep forced-termination probability low. We propose four schemes: SFTT (single-queue, FIFO, timeout, average timeout), SPTT (single-queue, priority, timeout, average timeout), DFTS (dual-queues, FIFO, timeout, statistical TDM), and DPTS (dual-queues, priority, timeout, statistical TDM). The four schemes, along with the NPS and FIFO schemes, were simulated and compared. For the SFTT scheme, we also simulated different average timeouts for initial calls. All four proposed schemes have better call-completion probabilities than the NPS and FIFO schemes. Call-completion probabilities can be improved by implementing a priority scheme which serves the waiting call with the least remaining time first. The implementation of statistical multiplexing also has the effect of increasing call-completion probability when the average new-call arrival rates are high. However, both the priority scheme and statistical multiplexing may increase forced-termination probability.     

不同沉积方式SiO2薄膜的自然时效特性

SiO2薄膜是光学薄膜领域内常用的重要低折射率材料之一。文中采用不同沉积技术在Si基底上制备了SiO2薄膜,并研究了它们光学特性的自然时效特性。采用不同贮存时间的椭偏光谱表征SiO2薄膜的光学特性,随着时间的增加,EB-SiO2薄膜和IAD-SiO2薄膜的物理厚度和光学厚度随着增加,但IBS-SiO2薄膜随着减小,变化率分别为1.0%,2.3%和-0.2%。当贮存时间达到120天时,IBS-SiO2薄膜、EB-SiO2薄膜和IAD-SiO2薄膜的物理厚度和光学厚度趋于稳定。实验结果表明,IBS-SiO2薄膜的光学特性稳定性最好,在最外层保护薄膜选择中,应尽可能选择离子束溅射技术沉积SiO2薄膜。     

超高压力传感器绝缘封装薄膜的工艺研究

为了提高锰铜传感器的测压上限,须用薄膜工艺制备无机绝缘三氧化二铝薄膜来作为传感器的绝缘封装层。采用电子束蒸发法,对影响三氧化二铝薄膜的相关工艺如:蒸发原料的纯度、成膜次数进行了研究。最终得出:由99.99%的三氧化二铝原料制备出的薄膜致密性好、缺陷少,其绝缘电阻率和损耗分别可达1012O·cm和103量级;而采用多次间隙蒸发可明显改善薄膜的附着性和致密性。     

RF反应磁控溅射纳米晶ZnO薄膜的XRD和XPS研究

采用RF反应磁控溅射沉积ZnO薄膜,沉积完成后对薄膜进行氧气氛下的原位退火处理。薄膜的结晶状况和化学成分分别采用XRD和XPS进行分析。结果表明,该薄膜为结晶性能良好的纳米晶薄膜,具有高度的C轴取向性。薄膜的主要成分为ZnO,不存在金属态Zn。采用文中的工艺方法可获得较高质量的纳米晶ZnO薄膜。