RANSAC 单模型估计算法。比较简单易懂，模型重构的基础算法，适合新手使用学习
标签： estimation RANSAC scale
上传时间： 2017-03-09
上传用户：gankiceljw
virtex ultra scale plus 16nm vcu 188 board user guide. For high speed and ultra scale design prototype.
上传时间： 2017-05-16
上传用户：hewangfeng
LED 一般是恒流操作的，如何改变 LED 的亮度呢？答案就是 PWM 控制。在一定的 频率的方波中，调整高电平和低电平的占空比，即可实现。比如我们用低电平点亮一个 LED 灯，我们假设把一个频率周期分为 10 个时间等份，如果方波中的高低电平占空比是 9：1， 这是就是一个比较暗的亮度，如果方波中高低电平占空比是 10：0，这时，全部是高电平， 灯是灭的。如果占空比是 5：5，就是一个中间亮度，如果高低比是 1：9，是一个比较亮的 亮度，如果高低是 0：10，这时全部是低电平，就是最亮的。 实际上应用中，电视屏幕墙中的几十百万 LED 象素都是这样控制的，而且每一个象素 都有红绿蓝 3 个 LED，每个 LED 可以变化的亮度是几百到几万或者更多的级别，以实现真 彩色的显示。还有在您的手机中，背光灯的亮度如果是可以变化的，也应该是这种工作方式。 目前的城市彩灯也有很多都使用了 LED，需要控制亮度是也是 PWM 控制。 下面来分析我们的例程，在这个例程中，我们将定时器 2 溢出定为 1/1200 秒。每 10 次脉冲输出一个 120HZ 频率。这每 10 次脉冲再用来控制高低电平的 10 个比值。这样，在 每个 1/120 秒的方波周期中，我们都可以改变方波的输出占空比，从而控制 LED 灯的 10 个 级别的亮度。 为什么输出方波的频率要 120HZ 这么高？因为如果频率太低，人眼就会看到闪烁感 觉。一般起码要在 60HZ 以上才感觉好点，120HZ 就基本上看不到闪烁，只能看到亮度的变 化了。 下面请看程序，程序中有比较多的注释： ――――――――――――――――――――――― #define uchar unsigned char //定义一下方便使用 #define uint unsigned int #define ulong unsigned long #include <reg52.h> //包括一个 52 标准内核的头文件 sbit P10 = P1^0; //要控制的 LED 灯 sbit K1= P3^2; //按键 K1 uchar scale;//用于保存占空比的输出 0 的时间份额,总共 10 份 char code dx516[3] _at_ 0x003b;//这是为了仿真设置的 //模拟 PWM 输出控制灯的 10 个亮度级别 void main(void) // 主程序 { uint n; RCAP2H =0xF3; //赋 T2 的预置值，溢出 1 次是 1/1200 秒钟 RCAP2L =0x98; TR2=1; //启动定时器 ET2=1; //打开定时器 2 中断 EA=1; //打开总中断 while(1) //程序循环 { ;//主程序在这里就不断自循环，实际应用中，这里是做主要工作 for(n=0;n<50000;n++); //每过一会儿就自动加一个档次的亮度 scale++; if(scale==10)scale=0; } } //1/1200 秒定时器 2 中断 timer2() interrupt 5 { static uchar tt; //tt 用来保存当前时间在一秒中的比例位置 TF2=0; tt++; if(tt==10) //每 1/120 秒整开始输出低电平 { tt=0; if(scale!=0) //这里加这一句是为了消除灭灯状态产生的鬼影 P10=0; } if(scale==tt) //按照当前占空比切换输出高电平 P10=1; } ―――――――――――――――――― 在主程序中，每延时一段时间，就自动换一个占空比，以使亮度自动变化，方便观察。 编译，运行，看结果。 可以看到，LED 的亮度以每种亮度 1 秒左右不断变化，共有 10 个级别。
上传时间： 2017-11-06
上传用户：szcyclone
High-Speed, Low-Power Dual Operational Amplifier The AD826 features high output current drive capability of 50 mA min per amp, and is able to drive unlimited capacitive loads. With a low power supply current of 15 mA max for both amplifiers, the AD826 is a true general purpose operational amplifier. The AD826 is ideal for power sensitive applications such as video cameras and portable instrumentation. The AD826 can operate from a single +5 V supply, while still achieving 25 MHz of band width. Furthermore the AD826 is fully specified from a single +5 V to ±15 V power supplies. The AD826 excels as an ADC/DAC buffer or active filter in data acquisition systems and achieves a settling time of 70 ns to 0.01%, with a low input offset voltage of 2 mV max. The AD826 is available in small 8-lead plastic mini-DIP and SO packages.
上传时间： 2020-04-19
上传用户：su1254
From the transition of analog to digital communication along with seamless mobility and high computing power of small handheld devices, the wireless communications industry has seen tremendous changes leading to the integration of several telecommunication networks, devices and services over last 30 years. The rate of this progress and growth has increased particularly in the past decade because people no longer use their devices and networks for voice only, but demand bundle contents such as data download/streaming, HDTV, HD video , 3D video conferencing with higher efficiency, seamless connectivity, intelligence, reliability and better user experience. Although the challenges facing service providers and telecommunication companies differ by product, region, market size, and their areas of concentration but time to market, efficient utilization of their assets and revenue expansion, have impacted significantly how to manage and conduct their business while maintaining sufficient margin.
标签： Convergence Networks Beyond 4G of
上传时间： 2020-05-26
上传用户：shancjb
The surge of mobile data traffic forces network operators to cope with capacity shortage. The deployment of small cells in 5G networks is meant to reduce latency, backhaul traffic and increase radio access capacity. In this context, mobile edge computing technology will be used to manage dedicated cache space in the radio access network. Thus, mobile network operators will be able to provision OTT content providers with new caching services to enhance the quality of experience of their customers on the move.
上传时间： 2020-05-26
上传用户：shancjb
The idea of writing this book entitled “Cognitive Networked Sensing and Big Data” started with the plan to write a briefing book on wireless distributed computing and cognitive sensing. During our research on large-scale cognitive radio network (and its experimental testbed), we realized that big data played a central role. As a result, the book project reflects this paradigm shift. In the context, sensing roughly is equivalent to “measurement.”
标签： Cognitive Networked Sensing Data Big and
上传时间： 2020-05-26
上传用户：shancjb
This book describes how global mobile communication was made. It is written for those who want or need to know how this was achieved e.g.: † Young professionals who want to build their career on GSM and UMTS and need to understand the basics † Strategic and technical planners who want to drive the future GSM and UMTS develop- ment † Strategists who plan to repeat GSM’s success in the fourth generation † Academics, who want to understand and analyse the development of GSM and UMTS; † Activists in other large scale international communication projects who want to use experiences gained
标签： Creation UMTS GSM and The of
上传时间： 2020-05-27
上传用户：shancjb
The ever-increasing demand for private and sensitive data transmission over wireless net- works has made security a crucial concern in the current and future large-scale, dynamic, and heterogeneous wireless communication systems. To address this challenge, computer scientists and engineers have tried hard to continuously come up with improved crypto- graphic algorithms. But typically we do not need to wait too long to find an efficient way to crack these algorithms. With the rapid progress of computational devices, the current cryptographic methods are already becoming more unreliable. In recent years, wireless re- searchers have sought a new security paradigm termed physical layer security. Unlike the traditional cryptographic approach which ignores the effect of the wireless medium, physi- cal layer security exploits the important characteristics of wireless channel, such as fading, interference, and noise, for improving the communication security against eavesdropping attacks. This new security paradigm is expected to complement and significantly increase the overall communication security of future wireless networks.
标签： Communications Physical Security Wireless Layer in
上传时间： 2020-05-31
上传用户：shancjb
Communication has been one of the deepest needs of the human race throughout recorded history. It is essential to forming social unions, to educating the young, and to expressing a myriad of emotions and needs. Good communication is central to a civilized society. The various communication disciplines in engineering have the purpose of providing technological aids to human communication. One could view the smoke signals and drum rolls of primitive societies as being technological aids to communication, but communication technology as we view it today became important with telegraphy, then telephony, then video, then computer communication, and today the amazing mixture of all of these in inexpensive, small portable devices.
标签： communication Principles digital of
上传时间： 2020-05-31
上传用户：shancjb
