Friday, March 30, 2007
Thursday, March 8, 2007
De Morgan's law logic gate
This logic gate simulation is more complex than the last one. There are still only two switches but there are now two outputs, two NOT gates, a NAND, and there is an or. this simulation is used to prove DeMorgan's law.
| A | B | NAND | Output 1 | NOT A | NOT B | OR | Output 2 |
| 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 0 | 1 | 1 | 0 | 1 | 1 | 1 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
logic gates
this particular logic gate starts out with two switches, an xor and an output. It then has added to it a not, which reverses the origanal output.
| A | B | output | Not |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 1 |
| 0 | 1 | 1 | 0 |
| 0 | 0 | 0 | 1 |
Friday, February 23, 2007
encoding numbers
positional number systems base the value of a digit on its position. this changes with the base that you use, for example in binary base2 110 does not equal the one hundered ten that it does in the base ten that we use regualarlly.
The easiest way to convert binary to decimal that we talked about in class involved using the 2 to increasing powersand then adding the numbers that correspond to ones in the binary number.
2^8 / 2^7 / 2^6 / 2^5 / 2^4 / 2^3 / 2^2 / 2^1 / 2^0
1 / 1 / 0 / 0 / 1 / 0 / 1 / 0 / 1
256 + 128 + 16 + 4 + 1 = 405
| num. | quotient | remain. | binary |
| 529 | 264 | 1 | 1 |
| 264 | 132 | 0 | 01 |
| 132 | 66 | 0 | 001 |
| 66 | 33 | 0 | 0001 |
| 33 | 16 | 1 | 10001 |
| 16 | 8 | 0 | 010001 |
| 8 | 4 | 0 | 0010001 |
| 4 | 2 | 0 | 00010001 |
| 2 | 1 | o | 000010001 |
| 1 | 0 | 1 | 1000010001 |
Friday, February 16, 2007
Global Swarming
Clark began this chapter with talk of slug slime and ant feramones, and then went on to show how this same principle is now being used in our every day online use. This is the principle that is used at online stores such as Amazon to suggest other purchases that you might consider making as a result of you previous purchases. This idea of following what others with your similar tastes just like the ants and the slugs.
Clark goes on to show the evolotion of search engines, from rudimentary, ineffective text searches to more complex, link searching systems that find the best matches by seeing where and how they link to other places. He also then continues on to educational programs that allow children to modify on screen behavior in a simulated environment. He also mentions Linux, a free operating system that is large improved, tweeked, and maintained by a global network of users.
Clark goes on to show the evolotion of search engines, from rudimentary, ineffective text searches to more complex, link searching systems that find the best matches by seeing where and how they link to other places. He also then continues on to educational programs that allow children to modify on screen behavior in a simulated environment. He also mentions Linux, a free operating system that is large improved, tweeked, and maintained by a global network of users.
Unix
cd
changes directory, by itself it will take you back to your home directory, and in conjunction with a directory name it will change to that directory.
ls
this command shows the files that are in a directory. this command can be modified by "-a", "-l" or both, -a shows you all the "dot" files in a directory and the -l shows your permissions.
whoami
this command shows you your current user name
exit
this command logs you off of the system
changes directory, by itself it will take you back to your home directory, and in conjunction with a directory name it will change to that directory.
ls
this command shows the files that are in a directory. this command can be modified by "-a", "-l" or both, -a shows you all the "dot" files in a directory and the -l shows your permissions.
whoami
this command shows you your current user name
exit
this command logs you off of the system
Monday, January 22, 2007
human technology
Its hard to argue against what Clark says about how we bond with our technology.
an example although not so common these days that every one has their own song for a ringtone, but it used to be if one person's cell phone rang you would see every one just instinctively reaching for their pockets.
Most of us are walking around with Mp3 players spiffy cell phones that do almost anything but make relyable phone calls, we go home to computers that are smaller and fast than any one in the 60's would have dreamed of, but the kicker about all of these things is that they are all after thoughts to us.
We have become so used to our technology that we don't think about it we just use it...an example although not so common these days that every one has their own song for a ringtone, but it used to be if one person's cell phone rang you would see every one just instinctively reaching for their pockets.
Infoport
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