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312 + 362 = 47.51
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Parent-Child Dimensions A special type of dimension that is encountered frequently is the parent-child dimension, or p-c dimension for short. Product is an example of a normal, or non p-c, dimension. The Product Category level might contain members such as Hardware, Software, and so forth. The Product Subcategory level might contain members such as Peripherals, Motherboard, Video Cards, Games, Business Applications, and so on. The members at each level are unique; in other words, a Product Subcategory is not also a Category. An individual product is not also a Product Group. There is a clearly defined hierarchy and all individual products are found at the lowest level of that hierarchy, and products are found at higher levels. Contrast that with a standard organizational chart. At the top is the President or Chief Executive Officer. Below that is a group of Vice Presidents. Next come Directors, Managers, and employees. However, one Vice President might have two Directors, another might have five, and a third Director might not have any. In addition, some parts of the business might have Managers and then Team Leaders, while other departments don t use team leaders. In other words, there s no welldefined hierarchy, so a table can t have a set number of columns to represent the levels in an organization. In addition, everyone is an employee. The CEO is an employee and thus needs to be in the employee table. Each Vice President, Director, and Manager is also an employee. This means that there will be individual employees at each level of the hierarchy, and that the hierarchical structure is not well defined. The classic way to handle this in a relational sense is to have an Employee ID field act as the primary key on the table. Then, in the same table, is a Manager ID field, which ties back to the Employee ID of that person s manager. The employee with either a blank Manager ID or a Manager ID that is the same as the Employee ID is the top of the hierarchy. Everyone else falls below that. As an example, take a look at Figure 3-3. This shows a simple organization chart for a very small company. Note that some Vice Presidents don t have any Directors and that different chains contain a different number of levels. Table 3-2 shows the relational structure that supports the organization chart from Figure 3-3. Note that a hierarchy of any level can be represented in a self-referencing table, which is a table in which one field is tied to another (usually the primary key).
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If you want to rethrow an expression from within an exception handler, you may do so by calling throw, by itself, with no exception. This causes the current exception to be passed on to an outer try/catch sequence. The most likely reason for doing so is to allow multiple handlers access to the exception. For example, perhaps one exception handler manages one aspect of an exception and a second handler copes with another. An exception can only be rethrown from within a catch block (or from any function called from within that block). When you rethrow an exception, it will not be recaught by the same catch statement. It will propogate to the next catch statement. The following program illustrates rethrowing an exception. It rethrows a char * exception.
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One goal of the Presentation server 4.0 and 32-bit Windows client version 9.x releases was to resolve issues that users with multiple monitors encountered. The following lists these enhancements. The list is separated into issues that are resolved by upgrading the client only, and issues that require both the upgraded client and Presentation Server 4.0.
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ISDN, or Integrated Services Digital Network, is best described as a digital version of the public switched telephone network. In many regions of the United States, ISDN was the first high-speed Internet access available for residential and small business subscribers.
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The earliest computer-based authentication mechanism was established as part of the Compatible Time Sharing System (CTSS) at the Massachusetts Institute of Technology in the early 1960s. The system s designer introduced the notion of a private code that students would memorize, much like they memorized the numbers for their combination locks on their student lockers. Today, of course, we use the term password to refer to such private codes ( Smith, 2002). Modern life today is littered with passwords: they stand in front of everything from children s personal computers to extensive business and financial resources. In theory, a password is memorized by a single person, it s hard to guess, it s never written down, and it s never shared. In practice, however, people constantly violate these expectations. Passwords are often written down, shared with other people, or chosen from among a small number of easy-to-guess words. There is an inevitable tug-of-war between choosing a password that s easy to remember and one that s hard to guess. Some systems try to force people to choose hard-to-guess passwords, and many people respond by keeping written lists of their hard-to-guess (and hard to remember) passwords. Of course, once this list is copied or stolen, the passwords provide no protection at all. Although passwords are both widely used and easily compromised, they illustrate the fundamental mechanism of automated authentication: the user must provide some information or input that cannot be provided by someone else. Consider what happens if an authorized user named Cathy tries to log in to a server, such as an e-mail server. The server takes information Cathy provides and compares it with her previously stored information. If the comparison is satisfactory, the server acknowledges Cathy s identity. If a different person, Henry, for example, tries to impersonate Cathy, he should not be able to provide the same information, so the comparison should fail. We summarize these features as follows:
Quality of Service (QoS)
amplitude and phase. In a nutshell, we can now see the circuit s effect on the gain and phase of a signal after it passes through an amplifier, filter, or openloop oscillator. With an S-parameter linear software program s Bode plotter we can not only view the effect a circuit has on the gain (S21) and phase [ang (S21)] of an inserted signal, but we can also observe the input (S11) and output (S22) return losses, as well as the reverse gain (S12). For accurate gain and phase responses under simulation, the input and output impedances of the circuit under simulation must be at exactly 50 ohms, since that is the default value of most linear simulators. This is an important concept, because it is not always possible to obtain 50-ohm input/output impedances with an open-loop oscillator, and the linear program s S-parameter port impedances may have to be changed to some higher or lower value to equal the actual input/output impedance of the open-loop oscillator circuit. (The true open-loop input/output impedances are always indicated in the oscillator design procedures of this book). If the terminating impedances of the circuit or simulator were not taken into account, the gain and phase margins displayed on the Bode plotter would be incorrect, and so would the Q and the indicated input/output oscillator s port matching. However, the resonant frequency peak as suggested on the Bode plotter will remain relatively unaffected. A linear S-parameter program, such as the Puff or Eagleware package, have a further advantage over normal Berkeley Spice programs: They will immediately indicate whether the open loops of the oscillator s input and output are properly matched to each other by displaying a Smith chart tool. The Smith chart will confirm that both the input (S11) and the output (S22) impedances of the open loop are matched at the frequency of interest. Figure 4.6 demonstrates how to best analyze an oscillator with a linear simulator by using the Bode tool in an open-loop circuit. Most software simulators will not actually have a physical Bode tool as displayed in the figure, but it will be shown as only input and output ports, with the designed oscillator circuit located between these two 50-ohm terminated ports. The Bode plotter
IP addresses on private, home networks need not be unique, except for the routers which connect to the Internet.
FIGURE 21-13
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The output is shown here:
Evolution Fabrication Traversing Burning Basic Composition Cladding Jacket Strengthening Fibers Light Flow in a Fiber Index of Refraction The Critical Angle Wavelength Determination Numerical Aperture Light Flow Optical Fiber Metrics and Terms Cable Size Cable Category Optical Attenuation Fiber Composition Glass Fiber Plastic Fiber Plastic-Clad Silica Types of Cable Cable Architecture
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