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15.4.1.3 Sample Extension Implementation Overview The framework hides many of the underlying details, including all the JMS details including message acknowledgment. The shared package hides many of the framework usage details and provides reusable implementations for commonly shared concepts such as transactions, requests, and catalogs of the subject strings used by different messages. The catalogs are useful when building lters to manage the message processing logic. Each subsystem ultimately has a single framework Node, which it uses for all communication. The JMS Message objects use the ObjectMessage message type to pass the application-de ned message classes (contained in the shared package) for all conversations. There is only a single ChatRoom used for this DDBE. When each application starts, it uses an application-de ned protocol to control how conversations are processed. In particular, the application processor fetches information about which nodes are de ned in the environment and the hubs that they are located at from the GDD. The other applications wait for a special message (a node-directory-info message), which broadcasts this information to all the nodes in the environment. 15.4.1.4 Sample Extension Deployment Overview Each application automatically loads a properties le. This le contains the details necessary to locate the (one and only) hub that contains the (one and only) node in the application. The application processor uses a simple but effective global data dictionary, which is stored in a DBE (RDBMS). The properties le for each application can contain many other details, including the JDBC connection details and actual SQL statements used by a particular deployed instance of an application. The databases used by the application processor and each data processor need to be created before these applications can be run. All of the runtime details can be speci ed in the properties les for each subsystem. The default deployment con guration speci es that all of the subsystems be deployed on a single machine. If we want to move a subsystem to a different machine, or deploy a new subsystem instance, we simply need to update the table found in the GDD database. Similarly, if we want to add another Hub to the environment, we simply deploy the JMS Provider instance and update the data in the GDD database to re ect the nodes that are located in that Hub. 15.4.2 Creating New Extensions

psychological distress and dysfunction in the child patient and/or the family. The child health psychology literature has contributed directly to all of these concerns. What appeared to be missing were models for explaining how research and clinical care could be linked in a comprehensive, effective, yet cost-effective, approach. Any target patient group, whether broad (e.g., all patients at a children s hospital, all patients followed in an outpatient pediatric practice) or narrow (e.g., patients seen by a subspecialty clinic such as oncology, cardiology, adolescent medicine) includes individuals representing a range of psychological functioning. We have conceptualized three general categories to describe children s and families responses to child health crises. We further link these categories to proposed levels of psychological care. These correspond to NIMH prevention categories of universal, selective, and indicated care, which is illustrated under each description and graphically shown in Figure 19.2. Universal Interventions Most families maintain well-being by coping adaptively with the disruption and distress associated with childhood chronic illnesses. For example, in childhood cancer, psychological adjustment improves over the rst 12 to 18 months after diagnosis, irrespective of whether an intervention is provided (Kazak, Penati, Brophy, & Himelstein, 1998), and psychological adjustment of children treated with heart transplantation improves after the rst year posttransplant (Todaro, Fennell, Sears, Rodrigue, & Roche, 2000). These children and families were most likely functioning within normal

Type 5 AS External Link Advertisement: This message is flooded to all areas except stub areas (explained later). It describes an external network reachable via the AS Boundary Router that generated it. Type 6 Multicast Group Membership LSAs: Allows multicast-enabled OSPF router to distribute IGMP (multicast group information). One last thing about LSAs: They contain 32-bit sequence numbers. This number is used to detect old and duplicate LSA packets. Each new LSA uses an incremented sequence number; therefore, OSPF routers keep their LSA databases current by updating them with an LSA of a higher sequence number. This also allows the OSPF router to flush out old entries. Another method employed by OSPF on its LSA database is the age field. Each LSA entry has an expiration timer that can expire, allowing the database to purge old entries.

Random Access Channel (RACH): uplink channel that delivers the users requests for a new connection. This channel is shared among all the users located in the cell; hence, an appropriate contention control mechanism is needed. Forward Access Channel (FACH): downlink channel that delivers control information to a mobile user. The control information is mainly related to the RUs assigned (by the scheduler in the base station) to that user for data transmission. As it is clear from the channel description, only the SCH channel must have a fixed position inside the frame. For the purposes of our discussion on TD-CDMA, we will assume that signaling channels will have a fixed position inside the matrix corresponding to the first and last two slots of each frame (see Figure 7.14). The assignment of the remaining RUs to transmit the user traffic is managed by the scheduling algorithm that is implemented in the base station. In the following, we will consider two traffic classes: voice and Internet data. The former requires a connection-oriented service with low delay (20 msec) and low bit error rate (BER) requirements (10E-3). Internet data is well delivered by a connectionless service with no stringent delay requirements. Each time a new voice connection must be activated, the voice terminal issues a request to the base station using the shared RACH channel. Once the request is received by the base station and the UMTS network has accepted the new connection, the resources allocated to the new connection on the UTRA-TDD access channel remain reserved until the connection is closed. On the other hand, the Internet traffic is highly bursty and to manage the channel in an efficient way, resources must be assigned to an Internet user only when it has data to transmit. Several allocation policies can be adopted for Internet traffic. In the following, we follow the approach proposed in [6]. According to this approach, RUs are allocated to the Internet traffic on a frame-by-frame basis. In each frame, RUs not reserved for voice traffic are fairly assigned to active data users (users with data waiting to be transmitted), i.e., each active user receives the same number of RUs. Therefore, Internet users access the RACH to request RU allocation only at the beginning of each busy period of their trans-

The CreateWorkRange function makes heavy use of the SpecialCells property. To learn more about the SpecialCells property, try recording a macro while making various selections in Excel s Go To Special dialog box. You can display this dialog box by pressing F5 and then clicking the Special button in the Go To dialog box.

oug Gehret is the director of rooms at the Waldorf Astoria in New York City. Prior to his graduation from Penn State in hotel, restaurant, and institutional management in the early 1990s, he did an internship with Walt Disney World. His rst job after graduation was with the Hilton Short Hills in Short Hills, New Jersey, as a management trainee in the front of ce. Mr. Gehret relates that he uses yield management every hour of every day with a revenue management department at the Waldorf Astoria. This interaction focuses on its room pricing versus the competition s room pricing and the number of con rmed and number of regrets that are based on price and availability. Reviewing this data allows the Waldorf Astoria to maximize business. He also says that the key to understanding the rooms operation is to understand the components of yield management. In today s hotel business, you have to increase topline revenues such as room sales because there is minimal opportunity to reduce expenses in order to grow pro t levels. Mr. Gehret interacts with other departments in