Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

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⚠️ This repository is archived: The content in this repository was moved to other locations. If you have issues or PR, please submit them to their new location. In this repository, we've put together ...

Want to boot your Raspberry Pi from USB instead of unreliable SD cards? If you've used a Raspberry Pi long enough, you've probably faced the… ...

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6月，北半球正式进入夏季。银河最壮丽的部分，也将在天黑后从东方徐徐升起。此时，如果我们朝东方高空看去，就能看到三颗璀璨的亮星，它们可以构成一个巨大的三角形，这就是著名的“夏季大三角”。 看到它，就可以定位银河的位置及在天空中的走向。