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<!DOCTYPE html><html lang="en"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"><meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"><meta content="yes" name="apple-mobile-web-app-capable"><meta content="black-translucent" name="apple-mobile-web-app-status-bar-style"><meta content="telephone=no" name="format-detection"><meta name="description"><title>ziyubiti | study hard everyday</title><link rel="stylesheet" type="text/css" href="/css/style.css?v=0.0.0"><link rel="stylesheet" type="text/css" href="//cdn.bootcss.com/normalize/4.2.0/normalize.min.css"><link rel="stylesheet" type="text/css" href="//cdn.bootcss.com/pure/0.6.0/pure-min.css"><link rel="stylesheet" type="text/css" href="//cdn.bootcss.com/pure/0.6.0/grids-responsive-min.css"><link rel="stylesheet" href="//cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css"><script type="text/javascript" src="//cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script><link rel="Shortcut Icon" type="image/x-icon" href="/favicon.ico"><link rel="apple-touch-icon" href="/apple-touch-icon.png"><link rel="apple-touch-icon-precomposed" href="/apple-touch-icon.png"></head><body><div class="body_container"><div id="header"><div class="site-name"><h1 class="hidden">ziyubiti</h1><a id="logo" href="/.">ziyubiti</a><p class="description">study hard everyday</p></div><div id="nav-menu"><a href="/." class="current"><i class="fa fa-home"> Home</i></a><a href="/categories/ML/"><i class="fa undefined"> ML</i></a><a href="/categories/Python/"><i class="fa undefined"> Python</i></a><a href="/categories/Web/"><i class="fa undefined"> Web</i></a><a href="/categories/5G/"><i class="fa undefined"> 5G</i></a><a href="/categories/Funny/"><i class="fa undefined"> Funny</i></a><a href="/archives/"><i class="fa undefined"> Archive</i></a><a href="/about/"><i class="fa fa-user"> About</i></a></div></div><div id="layout" class="pure-g"><div class="pure-u-1 pure-u-md-3-4"><div class="content_container"><div class="post"><h2 class="post-title"><a href="/2019/07/16/HexoCommandNotFound/">Hexo：command not found的问题解决</a></h2><div class="post-meta">2019-07-16</div><a data-thread-key="2019/07/16/HexoCommandNotFound/" href="/2019/07/16/HexoCommandNotFound/#comments" class="ds-thread-count"></a><div class="post-content"><p><strong>1.问题描述</strong><br> 因各种原因，可能更换使用电脑，这时需要在新电脑上重新搭建Hexo环境：<br> 首先安装git、Node.js与Hexo，有时安装node.js后，node与npm命令无效，需要链接到 /usr/local/bin 下。<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">ln <span class="_">-s</span> /home/Downloads/nodejs/bin/npm /usr/<span class="built_in">local</span>/bin/ </div><div class="line">ln <span class="_">-s</span> /home/Downloads/nodejs/bin/node /usr/<span class="built_in">local</span>/bin/</div></pre></td></tr></table></figure></p></div><p class="readmore"><a href="/2019/07/16/HexoCommandNotFound/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/08/08/olympic/">北京奥运十周年祭</a></h2><div class="post-meta">2018-08-08</div><a data-thread-key="2018/08/08/olympic/" href="/2018/08/08/olympic/#comments" class="ds-thread-count"></a><div class="post-content"><p> 10年前的今晚，北京奥运开幕，彼时的我，坐在公司的大会议室里，一边吃着水果看着电视上的开幕式，一边时刻准备着对市场前线TD-SCDMA应标人员提供技术支持。那时，中国移动刚开始大规模3G招标，公司看起来蒸蒸日上，前途无量；而北三环牡丹园的二手房也不过1万1平，每个月薪水可以买1平，我计算着什么时候能够凑够首付；而即使这样，已经有同样家底薄弱的同事，忍受不了已日渐高涨的房价，分别回了成都与西安。 <br> 10年后，通信1998-2008的10年黄金发展期已过，2008-2018的10年白银发展期也已步入尾声，与曾经喧嚣过的其它热门行业类似，后续将逐步步入青铜发展期及之后的夕阳发展期，通信已变成北邮学子不愿意选的专业；伴随着移动互联网与AI的腾飞，万众创业、风投上市成了学弟学妹们的热门词汇；自从海归变成海待，出国考托也已少人问津。随着中国10年大发展的红利，房价已涨6-10倍，同样的牡丹园已达9万1平。虽然薪水涨了些，却永远追赶不上通胀，安居的难度反而比10年前更大了。 <br> 纸币时代，每年14%的通胀，贷款利率却低于8%；保持财富不被稀释，跑赢通胀的唯一办法，高负债。 </p></div><p class="readmore"><a href="/2018/08/08/olympic/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/07/25/hphone/">那些年买过的手机</a></h2><div class="post-meta">2018-07-25</div><a data-thread-key="2018/07/25/hphone/" href="/2018/07/25/hphone/#comments" class="ds-thread-count"></a><div class="post-content"><p> 昨天刚买了个锤子旗下的坚果3,发现家里手机包装盒太多了，忍不住回忆了一遍，15年来从第1个到现在所买过的手机。 <br> 2003：天珑 彩屏和弦翻盖 <br> 2004：爱立信 T66 <br> 2005：西门子 xelibri X3 <br> 2006：Nokia 1108 <br> 2007：Nokia N73 <br> 2009：黑莓 7290， 天语T2 <br> 2010：Nokia 5230 <br> 2012：魅族 MX ， 21克 M3 <br> 2013：HTC One 802t， Huawei X1，联想A780 <br> 2014：sony Xperia SP M35h <br> 2015：乐视 乐1s X500 <br> 2016：乐视 乐max x900，苹果 7S Plus，努比亚 nubia Z11 minis <br> 2017：小米 Max2， 红米5A， <br> 2018：锤子 坚果3 <br> <br> 现在的智能机基本都是直板大屏。以前的手机形状种类真多，翻盖，滑盖，直板，全键盘之类。几个有特色的见下图。<br> <img src="../../../../imgs/hphone/fangai.jpg" alt="天珑是个韩系小品牌，已经没了，找个类似的三星图片吧"> </p></div><p class="readmore"><a href="/2018/07/25/hphone/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/07/11/autopilot/">科普佳作 -- 读《第一本无人驾驶技术书》</a></h2><div class="post-meta">2018-07-11</div><a data-thread-key="2018/07/11/autopilot/" href="/2018/07/11/autopilot/#comments" class="ds-thread-count"></a><div class="post-content"><p> 这两年无人驾驶/自动驾驶逐步成为热门话题，身为技术人员，自然对这些前沿技术比较感兴趣，个人直觉上觉得，目前的基于视觉深度卷积神经网络的成熟算法/框架如R-CNN/YOLO之类，应该可以满足物体识别与跟踪功能（交通标志/车道/行人等），但这仅仅是必备的感知功能，接下来无人驾驶系统该如何规划与决策呢？比如如何选择/保持/切换车道？如何定位自身的位置与姿态？如何避障与测距呢？仅靠GPS/Camera的精度是远远不够的。 <br> 带着这些疑问，花了一周时间，通读了《第一本无人驾驶技术书》，该书并不仅仅聚焦于核心算法，而是从整个工程架构上，完整介绍定位导航/感知/决策/控制算法，软硬件平台，安全与云平台，产业现状等。该书在广度上不仅回答了上述疑问，而且便于快速了解无人驾驶行业，理解无人驾驶相关技术与应用实践。至于该书缺憾，可能受限于这短短210页篇幅，深度有所欠缺，尤其是核心的决策/控制算法，意犹未尽。 <br> 我给它的评价：★★★☆ </p></div><p class="readmore"><a href="/2018/07/11/autopilot/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/06/16/menggu/">蒙古各部的演化</a></h2><div class="post-meta">2018-06-16</div><a data-thread-key="2018/06/16/menggu/" href="/2018/06/16/menggu/#comments" class="ds-thread-count"></a><div class="post-content"><p> 蒙古各部族演化到如今，各在哪个盟旗？下图一目了然给出了演化脉络。 <br> <img src="../../../../imgs/menggu/menggu1.jpg" alt=""><br> <img src="../../../../imgs/menggu/menggu2.jpg" alt=""><br> 注：图片摘自水木历史版，版权归原作者所有。 </p></div><p class="readmore"><a href="/2018/06/16/menggu/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/04/18/nbiotpeakrate/">NB-IoT简介(4)--物理层上行与下行峰值速率的理论计算</a></h2><div class="post-meta">2018-04-18</div><a data-thread-key="2018/04/18/nbiotpeakrate/" href="/2018/04/18/nbiotpeakrate/#comments" class="ds-thread-count"></a><div class="post-content"><p> <img src="../../../../imgs/nbiot/peakrate.png" alt=""> </p></div><p class="readmore"><a href="/2018/04/18/nbiotpeakrate/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/04/11/nbiotsib/">NB-IoT简介(3)--SIB and Grid example</a></h2><div class="post-meta">2018-04-11</div><a data-thread-key="2018/04/11/nbiotsib/" href="/2018/04/11/nbiotsib/#comments" class="ds-thread-count"></a><div class="post-content"><p> <img src="../../../../imgs/nbiot/sib.png" alt=""> <br> <br> <img src="../../../../imgs/nbiot/grid.png" alt=""> </p></div><p class="readmore"><a href="/2018/04/11/nbiotsib/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/04/04/5gnewwave2/">5G下行候选新波形简介(2)--W-OFDM与F-OFDM</a></h2><div class="post-meta">2018-04-04</div><a data-thread-key="2018/04/04/5gnewwave2/" href="/2018/04/04/5gnewwave2/#comments" class="ds-thread-count"></a><div class="post-content"><p><img src="../../../../imgs/5gnewwave/fofdm.png" alt=""> </p></div><p class="readmore"><a href="/2018/04/04/5gnewwave2/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/03/28/5gnrsssummary/">3GPP 5G-NR 随笔（1-5）：SSB/RMSI/BWP小结</a></h2><div class="post-meta">2018-03-28</div><a data-thread-key="2018/03/28/5gnrsssummary/" href="/2018/03/28/5gnrsssummary/#comments" class="ds-thread-count"></a><div class="post-content"><p> 5G NR区分于4G LTE的典型特性，是SSB、BWP、Beam sweeping特性，理解了这三个特性，就基本理解了5G系统的设计原则；而理解了如下问题答案，就理解了5G的基本设计思想。 </p></div><p class="readmore"><a href="/2018/03/28/5gnrsssummary/">Read More</a></p></div><div class="post"><h2 class="post-title"><a href="/2018/03/21/hangyebijiao/">由个人博客不同文章阅读量，观察行业变迁与热点技术</a></h2><div class="post-meta">2018-03-21</div><a data-thread-key="2018/03/21/hangyebijiao/" href="/2018/03/21/hangyebijiao/#comments" class="ds-thread-count"></a><div class="post-content"><p> 自己的博客，仅仅记录日常生活与技术随笔，从未推广过，阅读人群比较随机，故比较不同文章主题的阅读量，管中窥豹，可以粗略反映当前不同行业技术的热门情况。<br> 这里选择比较三篇文章的阅读量，主题分别关于 传统互联网、人工智能、通信，如下：<br> <img src="../../../../imgs/hangyebijiao/Image1.png" alt=""><br> <img src="../../../../imgs/hangyebijiao/Image2.png" alt=""><br> <img src="../../../../imgs/hangyebijiao/Image3.png" alt=""><br> 爬虫技术是传统互联网技术的一个分支方向，其应用比较成熟，阅读量为2597。<br> 深度神经网络做为人工智能的一个研究热点，关注度较高，阅读量达到11474。<br> NB-IoT是通信行业的一个近期热点，但关注度仍然较低，阅读量仅有808。<br> 传统互联网：人工智能：通信，三者之间的热度比例为3:14:1。<br> 见微知著，通信行业正无可奈何花落去，而人工智能似不尽长江滚滚来，如一轮红日喷薄欲出。 </p></div><p class="readmore"><a href="/2018/03/21/hangyebijiao/">Read More</a></p></div><nav class="page-navigator"><span class="page-number current">1</span><a class="page-number" href="/page/2/">2</a><a class="page-number" href="/page/3/">3</a><span class="space">…</span><a class="page-number" href="/page/7/">7</a><a class="extend next" rel="next" href="/page/2/">Next</a></nav></div></div><div class="pure-u-1-4"><div id="sidebar"><div class="widget"><div class="widget-title"><i class="fa fa-folder-o"> Categories</i></div><ul class="category-list"><li class="category-list-item"><a class="category-list-link" href="/categories/5G/">5G</a><span class="category-list-count">15</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/Funny/">Funny</a><span class="category-list-count">9</span></li><li class="category-list-item"><a class="category-list-link" href="/categories/Life/">Life</a><span class="category-list-count">7</span></li><li 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