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2. Next, boot up your computer and ensure that all running programs have been turned off. 3. Connect the USB cable (pictured in Figure 4-8) to an open USB port.

// Sum the values on a diagonal of a 3x3x3 matrix. using System; class ThreeDMatrix { static void Main() { int[,,] m = new int[3, 3, 3]; int sum = 0; int n = 1; for(int x=0; x < for(int y=0; y for(int z=0; m[x, y, z] 3; x++) < 3; y++) z < 3; z++) = n++;

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Datagram switching. Packet-switched services can take either of two forms: datagram or virtual circuit. In datagram switching, each packet is treated as an independent unit with no connection to other packets in the transmission. Packets with the same destination therefore do not need to follow the same route. Instead, each can be sent by whichever path is the most efficient at that instant. This flexibility is the major advantage of the datagram approach. Disadvantages are the amount of overhead required by each packet (each packet must carry complete addressing and sequencing information), and the amount of processing required at each node (new routing decisions must be made for each packet at every node). Virtual circuit switching. In virtual circuit switching, a route (called a virtual circuit) is established before any data packets are sent. All of the packets of a transmission are

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On the other hand, we may use the points ( 4, 5) and (6, 2) to calculate the slope: m= 3 2 5 = . 6 ( 4) 10

transmitted in the standard 6 MHz television band without some form of compression. Some of the rules and computations for NTSC video analogto-digital conversion are shown in Example 5-2. Digital television signals are used in studios and post-production facilities and are not transmitted over the air. Therefore, the necessary bandwidth requirement is not an issue. 5.412 In this section, the process of forming a television image in the digital domain will be addressed. A system of progressive scanning is used, as opposed to interlaced scanning for analog NTSC television. A superior television picture will result by essentially increasing the number of pixels over the surface of the television screen. With NTSC 4:3, 525 line pictures, the horizontal resolution is a function of video bandwidth and is de ned as the number of picture details that appear across threequarters of the screen width. The number of horizontal details can be computed by multiplying the bandwidth in hertz by the horizontal scan time, giving 449 details. Three-quarters of this number gives 337 lines of horizontal resolution. For vertical resolution, the total visible number of horizontal lines multiplied by 0.7, a utilization factor (Kell factor), gives 338, which is almost the same as the horizontal resolution. The pixel number corresponding to this vertical and horizontal resolution is simply the product of 449

upper left */ coordinates */ lower right */ coordinates */ current attributes */ normal attributes */ active video mode */ screen */ dimensions */ current X and */ Y cursor location */

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