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sensor interface), and the user can manipulate the sensor readings at selected sensor nodes by a simple slider mechanism in the visualization GUI. The visualization interface allows direct manipulation of the the values of the virtual sensor readings through the slider bar shown in the figure. Two types of sensor interfaces-acoustic and temperature-are currently supported and the value of each of them can be independently varied for each node. The screenshot of Figure 4.10 shows the values of the acoustic sensors at each node as bracketed integers below the circle representing the node. When a sensor is initialized, the constructor launches a file poller thread. This thread periodically polls a predetermined location on the disk. The frequency of polling is configurable, and so is the on-disk rendezvous file. When the user changes the value of a sensor from the visualization GUI, the updated value is reflected in the corresponding on-disk file and is propagated to the suitable node when its file poller thread reads the value next. Another mechanism for communicating sensor values between the visualization GUI and the simulated sensor node processes is available in the DART implementation but not enabled by default. This alternate mechanism uses a listener thread that opens a predetermined socket on the local machine. If the user changes the sensor reading through the GUI, the GUI process sends

In business and technical contexts, roles often map roughly to job descriptions, so it is relatively easy to get a reasonable first cut of user types to interview by understanding the kind of jobs held by users (or potential users) of the system. Unlike business users, consumers don t have concrete job descriptions, and their use of products may cross multiple contexts. Therefore, it often isn t meaningful to use roles as an organizing principle for the persona hypothesis for a consumer product. Rather, it is often the case that you will see the most significant patterns emerge from users attitudes and aptitudes, as manifest in their behaviors. Behavioral and demographic variables In addition to roles, a persona hypothesis should be based on variables that help differentiate between different kinds of users based on their needs and behaviors. This is often the most useful way to distinguish between different types of users (and forms the basis for the persona-creation process described in the next chapter). Despite the fact that these variables can be difficult to fully anticipate without research, they often become the basis of the persona hypothesis for consumer products. For example, for an online store, there are several ranges of behavior concerning shopping that we might identify:

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The next device to consider is the simplest multi-connection equipment: an Ethernet hub. Physically, a hub is a usually a small device that connects from four to eight Ethernet devices so that they can communicate with each other. The hub does this by providing a non-intelligent circuit board called a backplane that transmits electrical signals from any port to any other port. This transmission is done indiscriminately. Any Ethernet frame that arrives on any port is automatically forwarded to every other port. In this way, a hub precisely mirrors the electrical function of the original Ethernet thicknet cable. Any device on a hub can talk to any other device on a hub and, indeed, there is no way to prevent this from happening. A hub provides no intelligent filtering or forwarding capabilities at all, and can be thought of as simply a wire in a box. It should be noted that because a hub mimics the functions of an Ethernet wire, it is half-duplex only, so collisions can and often do occur. Figure 4.1 summarizes these points.

Frequency of shopping (from frequent to infrequent) Desire to shop (from loves to shop to hates to shop) Motivation to shop (from bargain hunting to searching for just the right item)

While hubs provide some advantages to the days of long thicknet cable runs and vampire taps, they can obviously be improved on. For example, it would be better to have a hub forward an Ethernet frame only to that port or ports that actually need it. Also, it would be better if the hub provided full-duplex capabilities and avoided collisions. These features are, in fact, provided by an Ethernet switch. An Ethernet switch processes the Ethernet header information in the frame and determines what the destination MAC address is. It will then make an intelligent forwarding decision and send the frame only to the port that needs to receive that destination MAC address. Also,

Although consumer user types can often be roughly defined by the combination of behavioral variables they map to, behavioral variables are also important for identifying types of business and technical users. People within a single business-role definition may have different needs and motivations. Behavioral variables can capture this, although often not until user data has been gathered.

Ethernet switches provide more intelligence in the backplane to buffer frames and prevent collisions on the backplane, enabling full-duplex conversations. These points are summarized in Figure 4.2.

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