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The following sections discuss the performance and scalability improvements you may realize when using Citrix Presentation Server 4.0 for Microsoft Windows Server 2003 x64 Edition. Items discussed include performance improvements in the x64 operating system and results from scalability testing performed in Citrix elabs.

Synchronization. Synchronization is used to determine the beginning and end of a frame of information. It is performed with signaling information in the form of bit fields, character sequences, and timeslots. There is a wide variety of schemes in use to synchronize frame transmission on networks. Addressing. Frames contain source and destination addresses. In the Ethernet frame example in the preceding section, this is done at the Data Link layer. Addressing also is performed at the Network layer with logical addresses called network addresses, which are the addresses of the source and destination computer systems. At the Data Link layer (layer 2), addressing is used to ensure point-to-point transfer of information from one physical interconnect device on the network to the next; at the Network layer (layer 3), addressing is used to ensure the end-to-end transfer of frames from the source computer system to the destination computer system. Many interconnect devices, such as routers, manipulate the addresses to facilitate the routing of frames through the network. Additional protocols are used to resolve the address mappings. Error correction. Frame transmissions are always susceptible to noise that makes its way into the signal. If this occurs, the protocols must detect the error and then either correct it automatically, request a retransmission, or ignore the frame. The detection often is accomplished by using Frame Check Sequences (FCS) that are added to the data in the frame. The FCS is calculated using a Cyclic Redundancy Check (CRC), which is a polynomial equation calculated on the incoming data to determine if all the bytes in the transmitted frame match the FCS value. The FCS is calculated by the sender and then, upon receipt of the frame, recalculated by the receiver; the receiver then makes a comparison to determine if errors have occurred. In the Ethernet frame example, the FCS is calculated at the Data Link layer. Header and control. The header and control fields of the protocol frames contain information necessary to manage the protocol operation. These include priority, routing, address, command and response information, and type fields. Payload (data). Most frames are sent so that information can be transmitted between two applications. Therefore most protocol frames on a network contain a payload or data field that ultimately is received by the host system application. Each protocol layer treats the information received from the layer above as data. There also are frames sent to facilitate network operation. These contain network-specific information and do not include a payload or data field. Routing. Routers are used to connect different local and wide area networks together and provide access to a larger internetwork. Internetworks are made up of LANs and WANs that often are implemented with dissimilar protocols and network architectures. Routing is implemented to provide a translation from one protocol to another. Frames transmitted on the network contain routing information to facilitate this transfer. Fragmentation and reassembly. In order to ensure that frames can be efficiently transmitted through an internetwork, it is often necessary to limit their size.

sometimes their own BI interface. They are loyal to the spreadsheet and think everything should be delivered in a spreadsheet. I used to underestimate the importance of this but was cured of my oversight in the early 1990s. After spending months developing a DSS system for a new transaction system, I waited with bated breath finally to train the users. The users balked at these inflexible, ugly mainframe-based reports and asked, Why do we need these reports Just dump all the data into Excel. Indeed! Fortunately, Business Objects has a couple of solutions for such users. First introduced in BusinessObjects Version 6.0, users can save a report directly to Excel; the save nicely preserves the charts, formatting, and breaks. Further, with the integrated scheduling in XI, you can schedule a report to be automatically exported to an Excel file format. Finally, Live Office allows users to execute queries directly from a spreadsheet. Links to the Web Intelligence or Crystal Reports documents are maintained in the spreadsheet, allowing users to access new data in real time. There are a number of challenges with BI and spreadsheet integration. Volume of data is one thing; multiple versions of the truth when the data is manipulated locally is another. So do consider why users want the spreadsheet integration at all. For a discussion of valid and less valid reasons, see BIScorecard.com, Spreadsheet Integration Criteria. Regardless of such challenges, do recognize this user segment and develop a strategy to meet their distinct needs while simultaneously ensuring that the spreadsheets do not get out of hand and become mini data marts.

Since the explicit relationship between the vectors p(0) and x(1) is not known, the in uence function matrix, Px, cannot easily be calculated. One approach is to take partial derivatives of Eqs. (13.48) and (13.49) with respect to the initial value of the costate vector, p(0) and interchange the order of differentiation (since continuity with respect to p(0) and t is assumed). The resulting two-point boundary-value problem is derived as follows. x(t ) = f ( x(t ), p(t ),t ) (t ) = g( x(t ), p(t ),t ) p 2H 2H Px (p1 ( 0),t ) = Px (p1 ( 0),t ) + 2 Pp (p1 ( 0),t ) p x p 2 H 2H 1 Pp (p1 ( 0),t ) = - 2 Px (p1 ( 0),t ) + Pp (p ( 0),t ) x x p with the following initial conditions x ( 0 ) = x0 p( 0) = p1 ( 0) Px (p1 ( 0),t ) = 0 Pp ( P1 ( 0),t ) = 1 where x1 (t ) p1 ( 0) . D Px (p1 ( 0),t ) = . . x5 (t ) p1 ( 0) Pp (p1 ( 0),t ) p(t ) p( 0) x1 (t ) p5 ( 0) x(t ) p( 0) x5 (t ) p5 ( 0)

You can intuit what others need if you just pay close enough attention. Relationships are what matters most. People like people who are as generous and thoughtful as I am.

The power grid is ubiquitous . The low-voltage power grid constitutes an existing networked infrastructure to millions of residential customers as well as businesses. Concurrently, it is a large-scale and fine-grained infrastructure, connecting hundreds of millions of people all over the world, but also even crossing the boundaries of homes and buildings to individual wall outlets and sockets, home appliances and electrical industrial equipment. The power grid offers the last mile. Through PLT, the power line offers the last mile connectivity to the individual customer. It is not the only last-mile technology, but it can be a significant competitor. Based on the individual situation, demands and capabilities, it is likely that the overall infrastructure will be a hybrid. The power line is positioned as a complement or alternative last mile. It can provide a permanent-access, two-way, always-on-line connection to the customer. The power grid supports information services . PLT technology is new and needs advances, for Telecommunications capabilities and commercial equipment cost reductions. However, the limited data rate transfer speeds are sufficient for many useful applications. A number of useful services are already feasible with data

An accurate description of a critical de ciency is important in determining appropriate responses, designing repair procedures that would eliminate the cause of de ciency, developing risk assessment, and arriving at a baseline for monitoring programs. Some bridges are weakened to the point that signs must be posted to bar vehicles heavier than the calculated maximum load. The following de ciencies may be found as a result of inspection: 1. Structural de ciencies. 2. Poor condition of deck, superstructure, and substructure.

By reducing the time spent gathering this information, because it is already available in the database, savings of 20 to 30 seconds of call- processing time can be achieved. However, the 20 to 30 seconds is not the critical part. Instead, the ability to satisfy the customer and provide better service levels is what is important. When one thinks of other alternatives that might exist here, a couple of thoughtprovoking ideas come to mind. For example, assume that an agent has received a call and a screen of information from an established customer. In this regard, the established customer has saved time by not having to provide his or her name, telephone number, and so on. The agent gets right to the task at identifying and verifying the customer. Now that the agent has the information, historical files on such things as buying or usage patterns can be developed so that the agent can suggest products and services to the customer based on past buying experiences. Moreover, if there is a problem with a particular customer, such as delinquent payment, the agent can readily obtain this information while talking to the customer. Let s extend that thought a little further. Assume that the agent encounters a delinquent customer who hasn t paid his or her bill for three months. While talking to this customer or taking an order, which is what the customer called for, the agent sees on the screen that the customer is delinquent and that collection action must be taken. Rather than becoming a collections manager, the agent can immediately suggest to the customer that the call must be transferred to the accounts receivable manager. When the agent transfers the call, not only does the call go to the accounts receivable department, but the screen from the database follows. When the accounts receivable department receives the call, the

From the Service Provider s perspective, a DOCSIS network might not make sense in a dedicated point-to-point link serving a single customer or in a link in which coexistence with video services is not necessary. This is due to the fact that current CMTS product offerings, as well as the DOCSIS MAC layer itself, are optimized for efficient sharing of the link (particularly the upstream link) by a number of users and would introduce unneeded overhead and complexity in the case of point-to-point communications. Further, if coexistence with video services is not required, then the adherence to legacy video spectrum allocations, channel formats, and coaxial cabling would be an unnecessary limitation. From the Carrier Ethernet customer s perspective, DOCSIS technology might not currently make sense when data rates approaching or exceeding 1 Gbps are required.