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One of the most interesting and important parts of the Internet is the Directory Name Service or the Domain Name Service In short, the DNS system permits human readable names to be quickly translated into IP addresses that are needed to route the packets across the network As is described in the addressing section, the IP address is structured by network and then by host It is read from left to right by the router in trying to find the proper destination network The human readable addresses are hierarchical from right to left For example, take the address Bud@TCICcom First, we know that it is somewhere in the com domain If I am George@biguniversityedu , I need to find Bud s address It is very likely that the university has no idea of what the address might be The local e-mail system therefore makes a query of the unnamed "" domain There are several of these servers around the Internet, which are updated daily by the InterNIC as names are registered There is some controversy over the InterNIC s absolute control over domain names (Someone has to be in charge to prevent chaos) To register a domain name, one (or one s ISP) must contact the Internic and pay an annual fee (Prior to the commercialization of the Internet, this function was performed by Stanford Research Institute (SRI) There are proposals to open other domains (for example, biz) and let other entities administer the names within that domain Each country has a domain and administers these domain names themselves All public entities such as cities, counties, and states are under the us domain Some of the country domains are uk for united kingdom, cz for Czech, de for Germany, au for Australia, etc Each domain then has its own DNS server so when George is trying to send e-mail to Bud, his e-mail server asks the domain for Bud s address The domain replies that it can only provide the address of the com DNS We then ask the com DNS that replies with the DNS address of TCIC Since TCIC is really under an ISP, what we really get is the address of the DNS server at that ISP Finally, we get Bud s real address Now, this address is put into the e-mail packets, and they are sent on their way In addition, we, the users, never knew about all the fooling around that went into finding the address in the first place.

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High-centering is a greater problem with a typical two-side-wheel differential bot setup, where a front or rear caster is raised enough to bring the driving wheels off the floor If all driven wheels are used to provide extra traction, accidentally raising one or more wheels reduces the available traction that a combat robot may need to defeat its opponent When using casters in the front and rear of a differentially driven robot, you should have each of them spring-loaded to prevent the robot from rocking back and forth, but not too much so that the robot might be lifted off its drive wheels

The early Internet was strictly ASCII text-based Then came the inclusion of Graphical Interchange Format (GIF) files As indicated previously, these were simply references in the hypertext document to a location that contained the graphic file that was displayed Next, came the desire to automate or animate Web pages Sun Microsystems invented a clever (and, to some, controversial) language called Java, which is a registered trademark of Sun Microsystems The basic problem was that to animate a page the local machine had to execute some software This opened the door to viruses Sun s clever idea was to have the browser execute the program, rather than the host hardware The good part was that you were somewhat protected from malicious programs The bad part was that the browser was interpreting the Java language on the fly, and this interpretation was slow (Faster machines help a lot here) The original idea was that the browser could prevent the Java script from doing any damage (like wiping out the hard drive) Unfortunately, the more powerful we needed the Java to become, the more capability it needed on our host machine Microsoft, naturally, has its own approach to page automation called Active-X The good part is that it runs as machine code The bad part is that it runs as machine code and can therefore contain viruses The user is given the opportunity to download or not download the Active-X code If you trust the source, go ahead and run it If you are not sure, cancel the download and do without the animations

Some of the several methods and configurations of wheel mounting are more applicable to unique terrain conditions such as the rocker bogie system used on some of the Mars robot rovers developed at NASA s Jet Propulsion Labs The predecessors to the famous Sojourner robot that roved about Mars s surface were named various forms of Rocky, after the wheel-mounting system used This system employs two pairs of wheels mounted on swivel bars that can help the wheels conform to uneven surfaces In smaller robots, many experimenters mount the wheels directly to the output shaft of the gearmotor This works fine for the light robots that are designed to follow lines on the floor or run mazes, but it doesn t work well for larger machines, especially combat robots that take a lot of abuse in their operation The output shaft of most gearmotors may have a sintered bronze bushing on the output side, and many times such a shaft does not have any sort of bearing on the internal side of the gearcase This type of shaft support is not made to take the side-bending moment placed upon it by wheels and heavy loads Bending moment is the name of the force that is trying to snap the shaft in two when one bearing is pressed down-