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.NET Framework 4.0 adds a convenient way to create groups (tuples) of objects. At the core is the static class Tuple, which defines several Create( ) methods that create tuples, and various Tuple<...> classes that encapsulate tuples. For example, here is a version of Create( ) that returns a tuple with three members: public static Tuple<T1, T2, T3> Create<T1, T2, T3>(T1 item1, T2 item2, T3 item3) Notice that the method returns a Tuple<T1, T2, T3> object. This object encapsulates item1, item2, and item3. In general, tuples are useful whenever you want to treat a group of values as a unit. For example, you might pass a tuple to a method, return a tuple from a method, or store tuples in a collection or array.

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Motorola s concept of seven different orbits on a polar orbital path would lend itself to the potential of collisions in mid-air if the spacing were not correct. Therefore, the spacing design had to take into account that the satellites were all traversing the same end-points where the paths would all cross. One can imagine that the two poles of the earth are the midpoints in the orbit. The Iridium network originally consisted of 77 satellites, however, a modification to the plans dropped the number of craft to 66. To assign or determine the best approach, Motorola took into account six critical criteria in determining the best approach. These are the following 1. The need to provide a single global coverage over the entire earth s surface for availability at all times. This means that each subscriber must have at least one satellite in view at all times to provide coverage. 2. Some portion of each orbit must be available to allow for low power outputs, which accommodates the recharging of the communications power subsystems. This minimizes the size requirements of the craft. 3. The relative spacing of the satellites and the line-of-sight relationships had to allow the on-board systems to control cross system linkage. 4. Costs for the entire constellation was a concern in the selection of the orbit and spacing requirements. Minimizing costs was a portion of the decision-making process. 5. The angle of incidence from the end user to the spacecraft as measured from the horizon to the line-of-sight communications process allowed link margins to accommodate the low-powered user device. The slant angle was selected at 10 to meet these criteria. 6. The final criteria was the operational latitude of the spacecraft. Systems operating over 600 nautical miles were affected more by radiation, which drives the cost up for the systems. Altitudes lower than 200 nautical miles required much more fuel and control over the positioning of the craft, thereby driving up the cost. At 413 nautical miles, the fuel consumption and command and control over the craft position coupled with the better radiation performance, the cost and coverage ratios provided a better solution.

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Social Security numbers are assigned by the federal government so the university does not have to assign them. In other cases, primary values are assigned by an organization. For example, customer numbers, product numbers, and employee numbers are typically assigned by the organization controlling the underlying database. In these cases, automatic generation of unique values is required. Some DBMSs support automatic generation of unique values as explained in Appendix 3.C. Entity Integrity Variations

packet capture and alarm generation capabilities, thanks to the Simple Network Management Protocol Remote Monitoring Management Information Base (SNMP RMON MIB, an 11-letter acronym!). Does this mean that it is time to put the protocol analyzer away In some cases yes, but the analyzers generally have much more comprehensive monitoring and analysis capabilities than even the most robust RMON solution. In addition, analyzers are portable and can be moved to remote segments where RMON agents might not exist. For most network problems you can start with RMON, but if you don t have an RMON MIB on the segment in question, or if the going gets tough, a protocol analyzer is indispensable. One final note on monitoring is that if the network fails, you may not be able to reach the monitor unless a special, out-of-band line has been installed. 16.2 Conformance Testing When testing for conformance, you will want to verify that the device has implemented the protocol stack accurately and completely, and that it will meet your performance needs.

CAMCO B-12345 (SAMPLE) FOLLOWER RADIUS FOLLOWER VELOC FOLLOWER ACCEL (INCHES) (INCHES/SEC) (INCH/SEC/SEC)

Broadband Communications and Asynchronous Transfer Mode Broadband Communications and Asynchronous Transfer Mode 225