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  • 实战大数据平台开发架构讲解

    本文来自于csdn,本文主要介绍了大数据平台的系统架构以及大数据开发过程离线和实时常用的技术框架的介绍,希望对您的学习有所帮助。对于业务数据数据量的暴增,用户智能化需求提升。在这个DT的时代,大数据的开发也就应运而生了,大数据开发必须解决两个问题,大数据量如何统一存储,大数据量如何统一计算。针对这些问题产生了很多大数据方面的技术框架。到今天为止,大数据方面的技术可以说已经相当成熟,BAT在大数据方面都应用十分的广泛,大数据量的分析使得数据更有了价值,运营有了通过大数据的分析可以做出精确的营销计划,通过收集用户的操作日志,分析用户行为,给出用户精确和有价值的推荐。人工智能也是通过海量数据做分析,

    2021-02-24
    5
  • 领域驱动设计架构

    领域驱动设计架构分成接口层(interfaces)、应用层(Applications)、领域层(Domain)以及基础设施层(Infrastructure)。下图描述这四者的简略图:四者的详细架构图:图二:领域驱动设计参考架构传统的三层构图:图三:传统三层架构图说明:作为参照,下图展示了传统TransactionScript风格的架构,可以看出,两者的差异并不是太大(对于Facade来说,它是一种可选设施,如果系统架构中省略Facade,则DTO与领域对象的互换工作可在service中进行),这也从侧面说明推行领域驱动设计的关键并不在架构上,而在于整个团队在分析、设计和开发上没有自始至终地以领

    2021-02-24
    5
  • 两类超宽带单偏振单模光子晶体光纤的设计

    基于模式截止法,设计了两种超宽带单偏振单模方形阵列液晶填充光子晶体光纤,利用全矢量有限元法分析了光纤纤芯中额外空气孔、纤芯孔间距及纤芯液晶填充孔径对单偏振单模传输特性的影响。所设计的带宽可调谐的超宽带单芯单偏振单模光子晶体光纤,其单偏振单模传输可在0.75~2.59 μm波段范围内调谐,限制损耗低于0.1 dB·km-1对应的单偏振单模传输带宽为970 nm。所设计的另一种光纤是在0.98~1.74 μm波段范围内具有单偏振单模传输特性的双芯光子晶体光纤,将其应用于波分复用系统的波分解复用器中,制备了一种长度仅为1.06 mm的光子晶体光纤波分器,实现了具有单偏振单模传输特性的1.31 μm和1.55 μm光分束。

    2021-02-22
    5
  • 一种基于词关联图的专题发现方法研究

    一种基于词关联图的专题发现方法研究

    2021-02-22
    5
  • Compact wavelength splitter based on self-imaging principles in Bragg reflection waveguides

    The self-imaging phenomena in multimode Bragg reflection waveguides (BRWs) have been predicted and<br />investigated by using the plane-wave expansion method and the finite-difference time-domain method. A<br />compact wavelength splitter based on self-imaging principles in BRWs is presented, and its transmission<br />characteristics are investigated by using the finite-difference time-domain method. Calculated results<br />indicate that, for the wavelength splitter witho

    2021-02-21
    5
  • Research on the reconstruction of fast and accurate AFM probe model

    The AFM image will be distorted due to the tip-broadening effect. It may be mathematically represented as the effect of the tip’s<BR>convolution on the real image. As a result, the true geometry of the sample surface can not be obtained. If the tip shape could be<BR>known accurately, such distortion can be eliminated with the adoption of disconvolution operation. It is of practical significance in<BR>the accurate reconstruction of the AFM image. Among the current tip modeling algorithms, the bli

    2021-02-20
    5
  • Efficiency-enhanced picosecond mid-infrared optical parametric downconversion based on a cascaded optical superlattice

    We demonstrate an efficiency-enhanced picosecond (ps) mid-infrared radiation via optical parametric downconversion. Based on a cascaded periodically poled MgO-doped stoichiometric lithium tantalate crystal (MgO:sPPLT), a tandem optical parametric oscillation-optical parametric amplification (OPO-OPA) process is achieved. Compared with a single OPO process, the conversion efficiency obtains an enhancement of 71%.

    2021-02-13
    5
  • Half baudrate electrical clock based demultiplexing scheme for OTDM-DQPSK signal using SOA and optical f ilter

    A demultiplexing scheme based on semiconductor optical amplifier (SOA) and optical filter for optical time division multiplexing differential quadrature phase shift keying (OTDM-DQPSK) system is proposed and investigated experimentally. With only a common half baudrate electrical clock modulated 33% duty cycle return-to-zero (RZ-33) optical clock signal as pump, this scheme is cost-effective, energy-efficient, and integration-potential. A proof-of-concept experiment is carried out for the demult

    2021-02-13
    5
  • 线性渐变滤光片型多光谱成像光谱仪设计

    设计了一种基于线性渐变滤光片(LVF)的多光谱成像光谱仪。针对工作波段为600~1100 nm 的LVF,设计了一个宽光谱扫描型LVF 多光谱成像光谱仪的成像物镜,总长不超过85 mm,畸变小于0.01%,全视场各波段Nyquist频率下调制传递函数优于0.7,空间角分辨率可达1.02′。该多光谱成像光谱仪可以通过扫描和图像重构获得目标的准单色图像以及反射光谱。实验结果表明,该多光谱成像光谱仪的光谱分辨率与LVF 的光谱带宽相匹配,在600 nm处光谱分辨率可达9 nm。通过番茄成熟度辨别实验,验证了该多光谱成像光谱仪的成像性能。

    2021-02-11
    6
  • 得克萨斯大学建立强光激光科学中心

    得克萨斯大学建立强光激光科学中心

    2021-02-11
    5
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