区链是一种由多方共同维护，使用密码学保证传输和访问安全，能够实现数据一致存储、难以篡改、防止抵赖的记账技术，也称为分布式账本技术。近年来，区链技术的发展对社会产生了重要的影响。本文介绍近年来区链关键技术的发展现状和研究进展。首先从共识机制、互操作性、安全性、隐私保护和可监管性等方面介绍了区链技术的现状和面临的挑战。然后重点从跨链通信技术、区链智能合约、区链安全性、区链监管与隐私保护、区链技术应用等方面分析当前国内外研究现状，并指出了相关技术的发展趋势和展望。作为金融科技的重要技术、数字经济的重要基础，区链技术在未来将发挥重要的作用,技术开发：lxqy1668
In some applications,quality filtering is crucial.Modern graphics hardware can deliver mipmapped texture access at very high speeds,but only by using a linear filtering method.Other filtering methods are available,and they are needed for some kinds of imaging applications.
When hardware filtering is unavailable,or when we need the utmost in image quality,we can use pixel-shading code to perform any arbitrary filter.
GPU shading programs are different from CPU shading programs in one key aspect:generally,the CPU is faster at math operations than texturing.In languages such as the RenderMan shading language,texture()is typically one of the most expensive operators.This is opposite to the situation in a GPU.
In GPU shading languages,texture operators such as tex2D()are typically among the fastest operators,because unlike CPU shaders,GPU shaders don't manage the surrounding graphics state or disk system.We can use this speed to gain a variety of useful elements for filtering,such as filter kernels and gamma-correction lookups.
随着区链应用增多，各个条线区链上承载和存储了大量信息，链与链之间的互联互通成为跨领域、跨行业应用的需求。同时链与链的互联互通也能够*大化的共享区链上存储的数据，有利于价值的*大化利用。跨链技术也成为实现链与链之间互联互通的有效手段，得到了较多的关注。跨链分为同构链的跨链和异构链的跨链。相比较而言，同构链的跨链交互在实现上相对容易，异构链的跨链技术实现难度较大，目前还较不成熟。目前主流的跨链技术有：公证人机制、侧链/中继、哈希锁定、分布式私钥控制等。