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Like the wedge, the lifter is designed to get underneath the opposing robot and lift its drive wheels off the ground The lifter uses an active device to do so an arm driven by hydraulics, pneumatics, a geared electric motor, a powerful spring cocked by a motor, or an electric linear actuator with enough power and leverage to tilt or lift up the other robot The end of the arm is often wedge shaped, or blended into a wedge-shaped front; and in many cases, it has grip-enhancing hooks or teeth Figure 10-3 shows a lifter robot The advantage of a lifter over a wedge is the ability to lift the other robot s wheels off the ground independent of movement While a wedge can only lift the opponent higher by shoving itself under its opponent, a lifter, once underneath the opponent, can lift it up as high as its arm can go while remaining stationary A well-designed lifter can drag its opponent around the arena freely, while a wedge can only push its opponent forward Most combat bots are designed to be low and wide, and won t fall over until tilted 90 degrees or more To flip opponents over with a lifter, you will need an arm with a maximum height comparable to the width of your targets Usually, this means the pivot point of the arm is located nearly at the back of the robot, and the arm should extend on top of or down the middle of your bot to the front Arms of this type can often double as self-righting mechanisms The most common drive systems for arms are linear drive actuators, either electric ball-screw types or pneumatic cylinders Electric screw actuators, consisting of an electric motor driving a telescoping cylindrical assembly through a nut and screw mechanism, make for a slow but powerful lift These devices have the advantage of being self-contained and functional in one unit, needing only an R/C relay or motor controller to extend and retract Pneumatics is a faster option A powerful pneumatic system can actually hurl the opponent into the air (see the description in the.

Figure 14-4: The new hybrid data network Growth in demand for Internet access and other two-way services has dovetailed with the trend within the industry to enhance existing cable systems with fiber optic technology Many cable companies are in the midst of the upgrade to HFC plants to improve the existing cable services and support data and other new services Companies are taking different approaches to online service access For some applications, customers may be accessing information stored locally at or near the cable head-end or regional hub such as the @Home [ 1 ] services being offered in many cities This may be temporary until wide area cable interconnections and expanded Internet backbone networks are in place to allow information access from any remote site

10:

Summary

Digital data signals are carried over Radio Frequency (RF) carrier signals on a cable system Digital data utilizes cable modems, devices that convert digital information into a modulated RF signal and convert RF signals back to digital information The conversion is performed by a modem at the subscriber premises, and again by head-end equipment handling multiple subscribers Look at Figure 14-5 for a block diagram of the cable modem

10-3

Installation of the various PerformancePoint modules is relatively straightforward There are actually few options to choose during installation and configuration Most commonly, people will set the Service Identity the Monitoring Server to a domain user account created for that purpose, while the Service Identity for the Planning Server must be a domain account Once the servers are installed and configured, they will run under the context of the Service Identity assigned to them PerformancePoint exists in an environment in which many components have security settings, such as IIS, SharePoint, SQL Server, Analysis Services, and so forth Using Kerberos is the easiest way to get all the components working and have the user s identity flow from the front-end client through IIS and SharePoint back to the data source Since not every company uses Kerberos, there are considerations for handling data communications in a double hop scenario, in which either custom security solutions must be created or the data sources must accept a single user account for all requests

Figure 14-5: Block diagram of the cable modem A single 6 MHz channel can support multiple data streams or multiple users through the use of shared Local Area Network (LAN) protocols such as Ethernet, commonly used in business office LANs today This is where the industry began in the late 1970s when Ethernet networks were applied to the broadband coaxial networks Different modulation techniques are being tried to maximize the data speed that can be transmitted through a 6-MHz channel Modulation techniques include Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), and Vestigial Side Band (VSB) amplitude modulation Comparing the data traffic rates for different types of modems shows why the cable modem is so popular under today s environment Table 141 is a comparison of a file download of 500 Kbytes using different techniques Table 14-1: Comparison of transmission speeds Time to Transmit a Single 500 Kbytes Image Telephone Modem ISDN Cable Modem Source: CableLabs 288 kbps 64 kbps 10 Mbps 6 8 minutes 1 15 minutes Approximately 1 second