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14.9 DATA FUNNELING In this section, a combination of two methods is discussed which improve the lifetime of energy constrained networks by reducing the amount of communication needed to send readings from a set of sensors to a controller. The rst scheme is a packet aggregation technique, which has been already discussed, while the second scheme performs data compression. While either of the two schemes can be used separately, using them together provides maximum gain. The main idea behind the algorithm, called data funneling [139], is the following. The controller breaks up the space into different regions (e.g. cuboids) and sends interest packets to each region, as shown in Figure 14.8(a). Upon receiving the interest packet, each node in the region will start periodically sending its readings back to the controller at an interval speci ed in the interest packet, usually every few minutes. Since many or all of the nodes within the region will be sending their readings back to the controller at the same time, it would be much more ef cient to combine these readings into a single packet, so that only one packet with only one header travels from the region to the controller. The question is, how can all these reading be collected at a single point and combined into a single packet As already discussed in Section 14.3.3, the data funneling algorithm works as follows. The interest packets are sent toward the region using directional ooding. Each node that receives the interest packet checks if it is in the target region. If it is not, it computes its cost for communicating back to the controller, updates the cost eld within the interest packet, and sends it on toward the speci ed region. This is the directional ooding phase.

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the plug-ins/orgeclipseswtwin32_300/ws/win32 directory (see Figure 41)

Developers should use parentheses to make code more readable, disambiguating expressions explicitly instead of relying on operator precedence

Figure 4-1

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When a node that is in the target region receives the interest packet from a neighbor node that lies outside the target region, the directional ooding phase concludes The node realizes that it is on the border of the region and designates itself to be a border node, as shown in Figure 148(b) Each border node computes its cost for communicating with the controller in the same manner as was done by the nodes outside the region during the directional ooding phase It then oods the entire region with a modi ed version of the interest packet The cost to reach the controller eld is reset to zero and becomes the cost to reach the border node eld Within the region, each node only keeps track of its cost for communicating with the border node, not its cost for communicating with the controller.

Next, we will modify the HelloWorld class to convert it into a standalone SWT example To do this, remove the contents of the main() method and replace it with the following:

Assignment Operators (+=, =, *=, /=, %=)

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Hello World"); shellsetBounds(100, 100, 200, 50); shellsetLayout(new FillLayout()); Label label = new Label(shell, SWTCENTER); labelsetText("Hello World"); Color red = new Color(display, 255, 0, 0); labelsetForeground(red); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } reddispose(); displaydispose(); }

Intuitively, it is as if the border node becomes the controller of the speci ed region It is at one of the border nodes that all the readings from within the region will be collated into a single packet In addition, two new elds are added to the modi ed interest packet One eld keeps track of the number of hops that have been traversed between the border node and the node currently processing the packet The other eld speci es the border node s cost for communicating with the controller, and this eld, once de ned by the border node, does not change as the packet travels from one node to another Once the nodes within the region receive the modi ed interest packet from the border nodes, they will then route their readings to the controller via each of the border nodes in turn.

Note: After entering the new method text, select the Source > Organize Imports command (or press Ctrl+Shift+O) to add imports for all of the referenced SWT classes

1 discussed the simple assignment operator, which places the value of the righthand side of the operator into the variable on the lefthand side Other assignment operators combine common binary operator calculations with the assignment operator Take Listing 310, for example

Now we will examine each line in detail:

Since there are several border nodes within the region, maximizing aggregation of sensor readings requires all the nodes within the region to agree to route their data via the same border node during every given round of reporting back to the controller This is accomplished by having every node compute an identical schedule of which border node to use during each round of reporting This is achieved by each node in the region applying the same deterministic function to the vector of costs to reach the controller seen by each border node Since all the nodes apply the same function to the same inputs, they will all compute the same schedule, allowing them to collect all of their data at one border node during each round of reporting.

int x; x = x + 2;

Line 2: Each SWT-based application has one Display instance that represents the link between the underlying platform

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c# remove text from pdf

c# remove text from pdf

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c# remove text from pdf

itextsharp remove text from pdf c#

itextsharp remove text from pdf c#

c# remove text from pdf

itextsharp remove text from pdf c#

c# remove text from pdf

c# remove text from pdf

itextsharp remove text from pdf c#

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