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Domain: wallawalla.edu

Stories and comments across the archive that link to wallawalla.edu.

Comments · 8

  1. Re:30$? by rcw-home · · Score: 1 · on Ask Slashdot: DIY 4G Antenna Design For the Holidays?

    Another way to calculate this: Google "c/1.8GHz" and it'll give you the result in centimeters. Then just divide by two to get a half-wavelength dipole or divide by 4 to get a 1/4-wave ground plane length.

    If you want a high-gain directional antenna for >1GHz you're probably best off with a dish, perhaps using a cantenna-like feed horn.

  2. Use Save My Whiteboard and your Camera by frohro · · Score: 1 · on How To Enter Equations Quickly In Class?

    I am a professor of engineering, and the way I solved this problem for my students was to write software that allows me to process photos of the whiteboard very quickly (a minute or two per day). It automatically puts them on the web for the students. They can browse them at: http://people.wallawalla.edu/~Rob.Frohne/ClassNotes/ and they can print a pdf document of them as well from the web site. Lately I've included an MP3 recording of the lecture as well, so that they can hear it again as necessary. The processing software is called Save My Whiteboard and is available under GPL3 here: http://people.wallawalla.edu/~rob.frohne/SaveMyWhiteboard/index.html The php code for the web pages is available under GPL too if anyone really wants it. Rob

  3. Use Save My Whiteboard and your Camera by frohro · · Score: 1 · on How To Enter Equations Quickly In Class?

    I am a professor of engineering, and the way I solved this problem for my students was to write software that allows me to process photos of the whiteboard very quickly (a minute or two per day). It automatically puts them on the web for the students. They can browse them at: http://people.wallawalla.edu/~Rob.Frohne/ClassNotes/ and they can print a pdf document of them as well from the web site. Lately I've included an MP3 recording of the lecture as well, so that they can hear it again as necessary. The processing software is called Save My Whiteboard and is available under GPL3 here: http://people.wallawalla.edu/~rob.frohne/SaveMyWhiteboard/index.html The php code for the web pages is available under GPL too if anyone really wants it. Rob

  4. Re: Another source by Bovius · · Score: 2, Informative · on A DIYer's Quick Guide To Cheap Wireless Extension

    A link to an old writeup from one of my favorite professors: http://people.wallawalla.edu/~Rob.Frohne/Airport/Primestar/Primestar.html

    Also, ditto on the !news.

  5. Make your own antenna by tknd · · Score: 2, Interesting · on Parent-Friendly Wireless Bridge To Span 500 Meters?

    Research satellite dish antennas or cantennas. Both are cheap directional antennas (buy someone's used satellite dish) and of course you will want direct line of sight between the two antennas.

  6. Re:Cell? Primestar! by Anonymous Coward · · Score: 0 · on What To Do When Broadband is Not An Option?

    Actually Primestar dished work really well too, just remember that they are "offset" so the aiming is counter-intuitive (ya gotta flip it or angle it towards the ground). http://www.wallawalla.edu/frohro/Airport/Primestar/Primestar.html is a good start but I'd put a POE access point or router in place of the tin can. Mark Stevens (the most famous of the "Robert X. Cringely"'s and a Wayne County Ohio boy, home of Smuckers, birthplace of Rubbermaid and Certified Angus) has some more tricks if you like. I collected primestar dishes and still have 8 or 10 of them. Cool toys!

  7. A Digital Camera Works for Me by frohro · · Score: 1 · on Effective Use of Technology In the Classroom?
    I like it when professors hand out notes, but I have a hard time making notes and then following them, so I use a digital camera to photograph the whiteboard or blackboard. I developed software to process those photos for presentation on the web. On the web pages the photos are also made available in a pdf handout that is generated from them. You can see some of my notes at:

    http://www.wallawalla.edu/frohro/ClassNotes

    and a dated version of some of the software used to process the photos is available here:

    http://www.wallawalla.edu/frohro/SaveMyWhiteboard/

    My students like having the notes available, because if they are having a difficult time understanding, they can drop their pencils, concentrate on the lecture, and possibly ask questions until they understand without giving up the notes they aren't taking. :-)

    The notes allow me to review last day's lecture quickly (using the laptop and projector) to bring everyone up to speed. I find answering students questions is a lot easier now, as I can use the notes instead of having to recreate them for every student. It takes me about 3 minutes a day to process the photos, but it saves me hours every week.

    Rob

  8. A Digital Camera Works for Me by frohro · · Score: 1 · on Effective Use of Technology In the Classroom?
    I like it when professors hand out notes, but I have a hard time making notes and then following them, so I use a digital camera to photograph the whiteboard or blackboard. I developed software to process those photos for presentation on the web. On the web pages the photos are also made available in a pdf handout that is generated from them. You can see some of my notes at:

    http://www.wallawalla.edu/frohro/ClassNotes

    and a dated version of some of the software used to process the photos is available here:

    http://www.wallawalla.edu/frohro/SaveMyWhiteboard/

    My students like having the notes available, because if they are having a difficult time understanding, they can drop their pencils, concentrate on the lecture, and possibly ask questions until they understand without giving up the notes they aren't taking. :-)

    The notes allow me to review last day's lecture quickly (using the laptop and projector) to bring everyone up to speed. I find answering students questions is a lot easier now, as I can use the notes instead of having to recreate them for every student. It takes me about 3 minutes a day to process the photos, but it saves me hours every week.

    Rob