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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛,有思想、有深度

...用send_LL(0x53,2402M)(注:2402M为信道频率)。这里还有一个问题,设备B怎么知道这个数据包是发给自己的还是其他人的,为此BLE引入access address概念,用来指明接收者身份,其中,0x8E89BED6这个access address比较特殊,它表示要发给周...
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Link to add to Google calendar

...UserUser 44.4k6464 gold badges158158 silver badges231231 bronze badges 30 ...
https://www.tsingfun.com/it/bigdata_ai/338.html 

搭建高可用mongodb集群(一)——配置mongodb - 大数据 & AI - 清泛网 - 专...

...储、高可扩展性和高可用性这些难题。不过就是因为这些问题Nosql诞生了。 NOSQL有这些优势: 大数据量,可以通过廉价服务器存储大量的数据,轻松摆脱传统mysql单表存储量级限制。 高扩展性,Nosql去掉了关系数据库的关系型...
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如何高效的学习掌握新技术 - 杂谈 - 清泛网 - 专注C/C++及内核技术

...当于又打开了一扇新的大门,可以从更宽广的角度来看待问题。 从心理学的角度来说,我们对于外部世界的认识可分为三个区域:舒适区,学习区,和恐慌区。我们所熟悉的技术领域就是舒适区,而新技术是处于学习区或恐慌...
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MFC RadioButton用法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术

...m_RBtGroup3); DDX_Control(pDX, IDC_RADIO9, m_RBtGroup4); } 问题一:如何更改RadioButton默认值??? 方法1 在定义控件变量时,默认变量初值为-1,表示此组的任何RadioButton均不被选中,如果需要改变初始默认按钮的设置情况,...
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如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...人若想在效率市场持续稳定的赢利,必须成功的解决两大问题:1、如何在高度随机的价格波动中寻找非随机的部分;2、如何有效的控制自身的心理弱点,使之不致影响自己的理性决策。很多投资家的实践都证明,交易系统在上...
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Why is isNaN(null) == false in JS?

... Won't work if myInt="123d". parseInt converts "123d" to 123, which then fails the isNaN test. – divesh premdeep Feb 18 '15 at 13:34 ...
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How to check if an object is a list or tuple (but not string)?

... Python with PHP flavor: def is_array(var): return isinstance(var, (list, tuple)) share | improve this answer | ...
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Convert JavaScript string in dot notation into an object reference

...,'etc']) #works with both strings and lists 5 > index(obj,'a.b.etc', 123) #setter-mode - third argument (possibly poor form) 123 > index(obj,'a.b.etc') 123 ...though personally I'd recommend making a separate function setIndex(...). I would like to end on a side-note that the original...
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What is the @Html.DisplayFor syntax for?

.... It's still very applicable to MVC3: http://www.dalsoft.co.uk/blog/index.php/2010/04/26/mvc-2-templates/ It's also useful if your Model has a Data annotation. For instance, if the property on the model is decorated with the EmailAddress data annotation, DisplayFor will render it as a mailto: li...