Stephen B Johnson
@stephen-b-johnson-lrt5rX Member
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Multicast - the good, the bad, and the ugly
Here is a good example of how a poorly planned use of multicast groups can look and what it looks like after I corrected the multicast...
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DC-3 - How cool it'd be to rehab one
The responsiveness and controls of the F/A-18 are quite awesome. It's not like we can get a personal one though. A Marine buddy from my squadron...
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DC-3 - How cool it'd be to rehab one
I keep thinking how I might want to get an old DC-3 and rehab it. Most of my aviation experience is on F/A-18 Hornets, but I...
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Where in the world is everyone from?
I'm in Madison, Wisconsin. It's part of the United States.
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Multicast - the good, the bad, and the ugly
I inherited a video platform where they used the same multicast IP for transport streams and changed the udp port. You can get away with this...
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Comparison of a device manager v. simple Perl script
Sorry about that... These can be viewed now.
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Comparison of a device manager v. simple Perl script
Here is a comparison of an awful GUI implementation and what I did to work around this painful thing with a simple Perl script. This is...
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An engineered machine / beast
It's actually $3M with all the options. If you want to see something really crazy, google this address. This is a buddy of mine's house (he...
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An engineered machine / beast
I cannot wait until my Lamborghini Centenario Roadster gets delivered. If you haven't seen it, then it's a must see.
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Good Aeronautical engineering paper presentation topics list
Interestingly... I have some of the initial concept designs for the B-1B which my grandfather had from his designs. I think it is a 9000psi hydraulic...
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Good Aeronautical engineering paper presentation topics list
(1) Reduction of fuselage cracking in the engine bays. I've seen this as a problem on multiple types of military aircraft. (2) Show why the fins...
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Designing a screw
You should make it left handed too. Then you could sell left handed screwdrivers. I already have left handed wrenches and a left handed hammer.
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ROR on Ubuntu 14.04
You could install wine and run windoze executables, but I'm not sure why anybody would want to do such a thing.
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What is deadlock in operating system?
Since nobody ever intends to encounter deadlock, there is a nice way some processor allow you to recover in case one is encountered. Using a hardware...
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What is deadlock in operating system?
In a RTOS, you can get into a priority inversion too. I recall this affecting NASA with the Mars Pathfinder. This can seem like a case...
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Safety hazard
If your lightening cable is showing signs of buldging near the connector shroud, please consider this image of a cable that I found one morning. I...
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uDrone
In all seriousness, insect or plant like devices can be used as a covert sensor network even if they have limited or no mobility. They do...
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Flawless design, but...
We design may of our remote sites with lots of redundancy and think of many failure scenarios that we can recover from with minimal impact. Today,...
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uDrone
A funny story. When I was in an F/A-18 squadron, we'd see Palmetto bugs (kind of like large cockroaches) around the hangar at night. We'd put...
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First computer
Stephen B JohnsonWhat was the first computer that you ever had or used? I had a TI 99-4A
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Spreadsheet misuse
How many of you have experienced spreadsheet misuse in your company? Seriously! It drives me insane when people send me some data in the form of...
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Ideal interview
I know this probably is not the norm, but my last two times interviewing were like this: (1) I received a call just before lunch, they...
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uDrone
My new uDrone concept. Virtually undetectable and can deploy in mass quantities.
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First computer
What was the first computer that you ever had or used? I had a TI 99-4A
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How does current flow in an AC Circuit.
AC current "flows" like it is alternating. Small displacements back and forth...repeating over and over with an amost deterministic period. It will usually lag the voltage,...
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OS jumping to another OS image
I had an interesting request for an embedded system awhile back. The board was to boot fully into vxWorks, then load a couple different other vxWorks...
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Can we convert sound energy into electrical energy?
Any form of energy can convert into a different form of energy. It's the efficiency of the transfer that varies. Light to heat or vice versa...
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Can someone explain Raspberry Pi3?
The Raspberry Pi or the Beaglebone Black are awesome little devices. A decent performing ARM processor, lots of GPIO, and can easily utilize a linux distro...
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What is the use of core in a transformer?
No. This is the answer to whether a transformer can be designed without a core. A transformer without a core would be two inductors coupled with...
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Why does mixing of conversations occur during usage of telephone?
It may not be physical layer issues. It could be bugs in the DSP design where ports are improperly being put into incorrect sessions. If the...
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What is the use of core in a transformer?
Ok, if you are asking this question then you have no fundamental knowledge of how a transformer works. Eliminate the core entirely and see how well...
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Best fonts for programming / coding?
Emacs - I can configure the fonts, colors, tabs to whatever I desire and it has worked for me for 20 years. The key is to...
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Best Book for Electrical Engineering?
The books or the lectures from Oppenheim @ MIT on signals and systems are good.
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which is better (.net or CCNA)
How can anything be posted improperly into this thread? "The Café - General Discussions On Everything" -- slight sarcasm 😨 In any case, I personally do...
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What is the difference between http and https?
Start wireshark, tcpdump, or whatever packet capture tool you have access to and capture some packet transfers for #-Link-Snipped-# (which will use port 80) and #-Link-Snipped-#.....
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CAmpus based iptv project
Get vlc and start streaming some content onto some multicast IPs, then join the streams from different devices. We have vlc running on a Beaglebone Black...
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Is electronics and communication engineering an evergreen branch?
I'm an Electrical Engineer working for a telecom company. If you are diverse enough, then you can do just about anything. I've managed IPTV platforms and...
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