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a large-area diffusing source. Coves are useful to supplement more energy-effective lighting methods, such as recessed downlighting systems. The placement ratios in figure 12.38 are intended to produce approximate visual uniformity. Specular reflections are minimized if the ceiling surface is a high-reflectance matte or satin finish. Typical cove dimensions are shown in figure 12.39. Custom-built coves are constructed of wood, plastic, or metal. A glass or plastic bottom is sometimes used to introduce a downward component of light for sparkle. Fluorescent lamps or cold-cathode tubes are commonly used in coves because they are energy-efficient, linear sources. All

The REMOVESPACES procedure uses some common VBA language elements, including:

27.5-30.5

ZRTP [19] is a new extension to RTP to add integrated key management and SRTP, making it a stand-alone protocol. No longer is there a need to exchange an SRTP master secret out-of-band or in the signaling path. ZRTP does this by performing a Diffie-Hellman key agreement in RTP packets, using RTP s header extension mechanism. To avoid having to utilize certificates for authentication and to prevent man-in-the-middle (MitM) attacks, ZRTP uses a retained shared secret from previous calls. This is similar to the way that the SSH protocol [20] allows a leap of faith mode in which the host key is accepted on the first session, then cached for future sessions. In ZRTP, endpoints authenticate each other by retaining and using a secret from a previous ZRTP session. In addition, it is possible to use a spoken voice authentication digest string to prevent a Diffie-Hellman MitM attack. ZRTP provides better confidentiality than SRTP and SDP Session Descriptions, in which the SRTP master key is available to proxy servers in the path. It provides better interoperability than MIKEY with its many modes and reliance on certificates. It is also simpler to implement in a backward-compatible way than the other approaches. ZRTP simply falls back to RTP when Hello ZRTP messages do not receive a response.

for taking the most difficult assignments in their company, and she had heard about him long before she came to Perkins. In fact, her former employer at USA Financial had warned her about him when she was recruited by Perkins two years before. Call me if you ever get a visit from Brankowitz, he had said to her, and I ll be glad to give you your old job back. The man was a dark legend. Tell me what you know about InsuranceAmerica, he said in a tone of voice that would give most midlevel managers the shivers. Gillian didn t flinch, although she was surprised that the news had traveled so fast. This meant that word had already come across the morning investment wire. Brankowitz was in her office for damage control. Oh, that, she said, pretending to be relieved. . . . I ve already drafted a plan to respond to their current situation. Every client claims to have budget problems, at one point or another. The man did not smile, or even change his facial expression. He tapped his finger on a photocopy of the morning s news, from MSN s financial pages.

Building your own MythTV media center can be a daunting task, but one that will give you a much more powerful and useful media center than anything that is currently on the market. Step by step, I showed you how to take off the shell components and build your own Linuxbased PVR media center system. With your MythTV project up and running, you can begin watching television, recording video, playing music, and managing digital images. MythTV is much more than just another PVR. It really does change the way you watch TV and interact with streaming information sources such as news and weather. And it even gives you a video game console and digital photo album. MythTV gets you all this audio/video resource convergence, but still allows you remote access to those resources from anywhere on the network. Because a MythTV system is a full-blown (and powerful) computer system, you can hook up devices such as photo printers, scanners, faxes, answering systems, home automation hardware and software, motion detection cameras, and more. By building your own MythTV media center, not only do you get some of the coolest, most cutting-edge multimedia convergence technology all in one box, you also learn a lot about multimedia and real-time technologies on Linux. Not to mention that you ll also bowl over all your friends by showing them the sleek, cool side of what Linux can do.

Electrically charged particles called electrons, which orbit the nucleus of an atom, can be made to flow from one point to another. This is observable in objects charged by friction and in natural phenomena: lightning is a huge spark of electricity. A flow of electricity is called an electric current; the rate of flow of an electric current is measured in amperes (amps, A). The potential of the flow of electricity is called voltage; it is measured in units called volts (V). Water provides a helpful analogy to these concepts. The amount of pressure that moving water exerts inside a pipe is analogous to volts; amperes are similar to the gallons-per-second measurement, the rate at which water passes through the pipe. The pipe is the conductor or wire, the wall of the pipe is the insulator, and the faucet is the resistance or dimmer. The larger the pipe, the greater the flow it can carry. The path through which an electric current flows is called a circuit. When no gap exists in the path, it is called a complete circuit (figure 11.1). When a gap occurs, it is called a break in the circuit.