cocoaNEC 2.0
Kok Chen, W7AY [w7ay (at) arrl (dot) net]

Machine Learning For Aerial Image Labeling

That’s because Aerial allows you to turn your Mac or MacBook into an Apple TV of sorts by displaying the gorgeous videos that Apple’s streaming box uses as its screensaver. And with Apple just.

That’s because Aerial allows you to turn your Mac or MacBook into an Apple TV of sorts by displaying the gorgeous videos that Apple’s streaming box uses as itsscreensaver. And with Apple just having released 11 more lovely videos themed around the sea, now’s as good a time as any to grab the new version of Aerial and enjoy the new content. Aerial is a macOS screensaver that lets you play Aerial videos from Apple's tvOS screensaver. This includes classic Aerial videos shot over various cities and locations (New York, San Francisco, China.), Earth videos from the ISS, and the new underwater videos introduced in tvOS 13. Download the Aerial screen saver from github here, then unzip the file (it’s likely in your Downloads. Screen savers for Mac. Designed and developed by Johansson Design. The only company in the world making new, modern screen savers.

cocoaNEC 2.0 is a Mac OS X application for designing and modeling antennas. As indicated by the name, cocoaNEC uses the Cocoa framework of Mac OS X.
The application is free and it can be downloaded from the Download page (which can also be accessed by using the Download tab button at the top of this page). The Xcode project with the cocoaNEC sources can also be downloaded from the same page. For non-commercial use, the source code for cocoaNEC 2.0 is free.
Online tutorials, reference manuals and example files for the application are available through the User's Manualtab button. The What's New page lists features that have changed since the previously released versions of cocoaNEC 2.0.
The Snow Leopard version of cocoaNEC makes use of the Grand Central Dispatch technology in Mac OS X to make use of all the cores on a modern Intel based Macintosh. This version works on both Snow Leopard (Mac OS X 10.6) and Lion (Mac OS X 10.7).
The Tiger version of cocoaNEC 2.0 is a Universal Binary application. It runs natively on both Intel based and PowerPC based Macintosh computers that use Mac OS X 10.4 (Tiger) or newer.
Except for the graphics elements, the Tiger version of cocoaNEC uses multiple cores of a processor only when modeling an antenna at multiple frequencies. The Snow Leopard version will use multiple cores for other parts of NEC-2 that are compute intensive.
Please note that the NEC-4 engine cannot make use of Grand Central Dispatch even with the Snow Leopard version of cocoaNEC. Except for the graphics portion of cocoaNEC, multi-core acceleration only functions when you use the internal NEC-2 engine.

One of the best features of the Apple TV is its Aerial screen saver. That’s not hyperbole—Apple always makes a big deal out of the new scenes it adds to tvOS, often promoting them as a marquee feature of major tvOS updates. If you have liked these screen savers on your TV, you can get them on your Mac, thanks to the free and open-source app Aerial.

I’m not sure how the development team gets away with it (Aerial is currently maintained by Guillaume Louel), but Aerial has been available for five years without interference from Apple. Which is a good thing!

Install Aerial

Full installation instructions are available on Aerial’s GitHub page, but they break down like this:

Download the latest Aerial.saver.zip.
Unzip Aerial.saver.zip if your browser hasn’t already done so.
If it’s open, quit the System Preferences app.
Double click Aerial.saver.
Choose whether to install Aerial for yourself or for all users. The latter option requires your administrator password on install and every update and isn’t generally worthwhile.

After installation you’ll end up at System Preferences > Desktop & Screen Saver > Screen Saver. If necessary, select Aerial in the left-hand scrolling list. To configure its options, click the Screen Saver Options button.

Aerial has a vast number of options. I’ll walk you through a few of the most important ones.

Configure Video Quality and Bandwidth Usage

Apple’s Aerial screen saver videos are beautiful but big, and by default, Aerial caches a new one from Apple every time the screen saver loads. If you have a bandwidth cap, you’re probably best using it on something else.

You can adjust Aerial’s Videos settings to make things look better, reduce bandwidth usage, and optimize CPU performance, but be warned that the number and specificity of the settings can get overwhelming fast.

The main setting you want to look at here is in the Video Format pop-up menu. The default on my Macs was 1080p HEVC, which didn’t look as sharp as 4K resolution but also didn’t use as much bandwidth. This menu may have quite a few choices, so let’s break down what they all mean:

4K or 1080p: 4K resolution will look sharper, while 1080p will use less bandwidth.
H264 or HEVC: These are encoding methods for video. H.264 is an older standard. HEVC is newer and allows for smaller video files with the same quality. If your Mac supports HEVC, go with that.
HDR: If you’re running macOS 10.15 Catalina or later, your Mac can display video in HDR quality, which shows more colors but can look “weird.” I like it.

The best thing approach is to click the question mark button next to the menu, which tells you if your Mac supports H.264 and HEVC hardware decoding and provides information on all the various available formats. Then choose appropriately from the pop-up menu.

If you use a laptop, pay attention to the When On Battery pop-up menu. The default is Keep Enabled, but you can save battery by switching to Always Disable, which displays the Aerial screen savers when the MacBook is connected to a charger but switches to a dimmed, black screen when on battery. There’s also a setting that causes Aerial to disable itself when your battery life dips below 20%, which might be the most balanced choice. If you’re leaving your unplugged laptop alone with the screen open for more than a few minutes, you’re wasting precious battery life.

One way to save bandwidth is to cache just the videos you want. Select one on the left to see a preview. If you like it, click the plus button to download it. The checkboxes at the left let you enable and disable videos in the rotation—handy if there are some you don’t enjoy.

Here’s a tip: click the gear icon and choose Check Only Cached to play only the videos you’ve downloaded. If you want to remove a video from your local storage, Control-click it and choose Move To Trash.

By default, the Aerial screen saver randomly plays videos and caches each one. Over time, that can add up—I’m talking about gigabytes here. To manage Aerial’s local storage, go to the Cache screen, which lets you turn off automatic caching, download all the videos, and show the videos in the Finder so you can easily delete them.

To preview the Aerial screen saver, return to System Preferences > Desktop & Screen Saver > Screen Saver, hover your mouse pointer over the preview thumbnail, and click the Preview button that appears.

Change Onscreen Info

The Aerial screen saver can show additional information on the screen while it’s playing Apple’s videos. By default, it shows the current time and the location of the video. You can configure what appears in the Info screen.

Aerial provides five onscreen widgets for you to configure: a custom message, the current time (Clock), the video location, battery level, and a countdown. The countdown option is unusual but possibly helpful: you could set it to count down to a specific time or date, like a meeting or a birthday.

Each widget offers its own options, but two are consistent: the Enable checkbox, which enables or disables that widget, and the position setting, which is a thumbnail image with radio buttons that let you pin the widget to different parts of the screen. The location widget also has a random option to put it in a random corner of the screen.

Other Settings

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There are two additional settings in Aerial’s Options screens that may be worthwhile.

First, if you have two monitors, you can use the options in the Displays screen to play the videos on either or both screens. More interestingly, Ae

Aerial For Mac