Related Properties in .NET

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Cellular radio standards. A number of different cellular telephone standards are in use. In the analog era, the Nordic Mobile Telephone (NMT) standard was the first to be introduced, in 1979. This was followed by AMPS in North America and TACS in the United Kingdom. These are all FM FDMA (Frequency Division Multiple Access) systems. New digital mobile systems entered the market in the 1990s, notably the GSM Time Division Multiple Access (TDMA) system, which has become the standard in Europe and the Asia-Pacific region. In North America, the digital standards use TDMA and Code Division Multiple Access (CDMA), which allows multiple users to occupy the same spread-spectrum bandwidth, but identifies each with a specific coding incorporated into the modulated RF signal. Digital standards achieve a higher number of subscribers per megahertz of allocated bandwidth, provide better service quality, and offer improved security compared to earlier analog systems because of the coding and frequency hopping. Cells. The term cellular radio derives from the system s frequency plan, which divides a geographical area into a honeycomb of cells. The size of a cell depends on traffic density. Each cell in a city might be 3.3 km in diameter; in a downtown business area, microcells as small as 500 m2 might be used. Out in the sparsely populated countryside, cells could be 10 30 km in diameter. Each cell is served by a base station that operates with a small portion of the allocated frequency band, and transmitter power is set according to the size of the cell to be covered. Each cell s portion of the frequency band differs from those of its neighbors to avoid interference. By setting the transmitter power at only the level required to cover a particular cell, the operating frequency can be reused again for another cell some distance away. This is called the frequency plan. As a mobile telephone roams from one cell to another, it retunes to new frequencies. At the same time, the cellular radio network updates its database (the Vehicle Location Register) to show the changing location of the particular mobile unit. The database enables a subscriber in the public switched telephone network (PSTN) to call into a mobile unit. These connections are the function of the mobile telephone switch (MTS) or mobile telephone exchange (MTX), which uses Signaling System 7 (SS7) for database messages and controlling the call. The database transactions not only keep track of the mobile unit s movements, they also check that legitimate calls are being made into the network by comparing details of the mobile s registration with information in the database called the Home Location Register (HLR). The mobile telephone segment has been one of the fastest growing parts of the telecommunications network. Since the late 1980s, the average annual growth in the number of mobile subscribers has been around 50 percent per year, reaching a total of over 120 million in 1996, of which around 30 percent were digital. This represents a significant fraction of the total network traffic.
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Figure 8-12 Successful reservation for a single sender and a single receiver
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What are key risk factors one should be Travel and unprotected sex in aware of in the history and physical (H&P) tropical regions or regions where LGV is endemic (Africa, Southeast Asia, India); anal sex What are the key physical findings at each stage of this disease Stage 1: small, painless papules/ shallow ulcerations typically on the vaginal wall that often go unnoticed Stage 2: painful unilateral inguinal lymphadenopathy (typically in men); women may complain of lower back/ abdominal pain because of deep pelvic node involvement; bubo (matted nodes that adhere to the overlying skin); systemic symptoms; groove sign (enlargement of the nodes above and below the inguinal ligament) Stage 3: rupture of the bubo leads to genitoanorectal syndrome (strictures and fistulas in the anogenital tract); constitutional symptoms; proctocolitis; abscesses At what stage do most women present Which finding is pathognomic for LGV What other diseases may present with similar cutaneous lesions What are the most common laboratory tests used to diagnose LGV Stage 3 Groove sign (inguinal buboes with nonsignificant ulcers = LGV) Granuloma inguinale, tuberculosis (TB), early syphilis, and chancroid Complement fixation tests (used most often) Serologic tests for IgG antibodies Immunofluorescence on aspirates from bubo for the presence of inclusion bodies PCR for C. trachomatis or DNA swab from lesion Genital or lymph node specimen tested by culture How is LGV treated Oral doxycycline or erythromycin for 3 weeks Lymph node aspiration if needed What are some complications of LGV Fistulas, strictures, tissue ischemia and necrosis; elephantiasis of the female genitalia (esthiomene)
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It is possible to define a method that will be called just prior to an object s final destruction by the garbage collector. This method is called a destructor, and it can be used in some highly specialized situations to ensure that an object terminates cleanly. For example, you might use a destructor to ensure that a system resource owned by an object is released. It must be stated at the outset that destructors are a very advanced feature that are applicable only to certain rare cases. They are not normally needed. They are briefly described here for completeness. Destructors have this general form: ~class-name( ) { // destruction code }
In addition to the contributions of XenApp and the ICA protocol to application delivery performance, XenApp also enhances the basic multiuser client/server environment. XenApp embodies numerous innovations designed to facilitate a broad range of hosted application environments. Considerable effort has been invested by XenApp designers to enable all applications, whether remote or local, to operate and interoperate as though they were local to the end user. This approach increases the user s comfort level and decreases the required training time.
Section V: Review Questions and Answers
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The entire contents of the Study Guide is provided in PDF format. Adobe s Acrobat Reader is used to read PDF files and can be downloaded free of charge from www. Simply select the View Book In Electronic Format link from the main CD launch page.
In some situations, you may want to turn off auto-created printing altogether. To do this, configure a policy so that no client printers are auto-created. This means that only network printers or local printers (printers attached directly to a server) can be used. Here are the steps to follow: 1. In the Presentation Server Console, select the Policies node. 2. On the Contents tab, choose the policy for which you want to configure printing rules or create a new one. 3. From the Actions menu, choose Properties. 4. In the policy s Properties dialog box, expand Printing and then Client Printers. 5. Under Client Printers, enable the Auto-creation rule. 6. Select Do not auto-create client printers. 7. Save and enable the policy. TIP: In previous versions of Presentation Server (3.0 and earlier), the properties of autocreated client printers were retained in the server-side user profile. During logoff, user printing preferences, printer device settings, and other data were written into the HKEY_CURRENT_USER\ Printers\Citrix key. During logon, retained properties in the profile were applied to the created client printers, effectively re-creating the printer exactly as it was the last time the user logged on. In Citrix Presentation Server 4.0 and higher, printer-retained properties are streamed to the client so that they are retained for roaming profiles. Not all clients support the new protocol extensions required to service this functionality, so properties are still retained in the server-side user profile as needed. If you are experiencing problems with auto-created printers for a user, open the user s profile (NTUSER. DAT) in a Registry editor, browse to the \Printers\Citrix key, and remove all the printer retention entries. This should give the user a clean slate for the next logon. This can be set and forced using Citrix policies. Refer to the Citrix Policies section later in this chapter for more detail.
The Business Case for Going to the Cloud
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