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Potentials, IEEE

Issue 5 • Date Dec. 2004-Jan. 2005

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Displaying Results 1 - 18 of 18
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  • Bluetooth scatternet models

    Page(s): 36 - 39
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    A Bluetooth scatternet is an ad-hoc network consisting of two or more Bluetooth piconets that are interconnected using bridge nodes. This interconnection allows devices that are not directly connected, and which may not be within transmission range of each other, to communicate. The scatternet formation has not been formally defined in the Bluetooth special interest group (SIG) specifications. As a result, numerous and varied protocols have been proposed. While modeling ad-hoc networking in general is complex, the additional restrictions imposed by the Bluetooth specifications - such as low cost of the device, low power consumption, and network resilience while using piconets that have a maximum of seven active nodes - have created a significant challenge. Numerous models for constructing Bluetooth scatternets have been proposed, some of which may require modifications to the existing Bluetooth specifications. View full abstract»

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  • Real-time imaging

    Page(s): 8 - 10
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    Real-time imaging systems are a special class that underlies important application domains that include industrial, medical and military. The main characteristic of a real-time imaging system is the need for deadline satisfaction. Admittedly, this definition is very broad and vague. The case can be made that every system is real-time. In a "hard" real-time imaging system even one missed deadline can lead to disaster. In a "firm" real-time imaging systems can tolerate a few missed deadlines. In many imaging systems, for example, a common deadline is that the screen be updated at least 30 times per second. Finally, in "soft" real-time imaging systems, missed deadlines manifest as performance degradation. For instance, the image processing used in an animated cartoon system. Most entertainment systems tend to fall into the category of soft real-time imaging. Real-time imaging systems typically process a stream of digital images, analyze the images and then control some part of the system based on the results of the analysis. Real-time imaging systems comprise a wide range such as robotics, industrial inspection, high-definition television, advanced simulators, computer-aided manufacturing and intelligent vehicles. View full abstract»

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  • What is Bluetooth?

    Page(s): 33 - 35
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    Bluetooth is a standard for short range, low power, and low cost wireless communication that uses radio technology. Over 2100 companies around the world already support Bluetooth technology. The wireless personal area network (WPAN) technology, based on the Bluetooth specification, is now an IEEE standard under the denomination of 802.15 WPANs. This work presents an overview about the Bluetooth communication . Bluetooth wireless technology encompasses several key points that facilitate its widespread adoption: 1) it is an open specification that is publicly available and royalty free; 2) its short-range wireless capability allows peripheral devices to communicate over a single air-interface, replacing the cables that use connectors with a multitude of shapes, sizes and numbers of pins; 3) Bluetooth supports both voice and data, making it an ideal technology to enable many types of devices to communicate; and 4) Bluetooth uses an unregulated frequency band available anywhere in the world.. To fully realize the Bluetooth vision, full networking of multiple Bluetooth devices is required. This leads to the investigation of Bluetooth scatternets, which must address scatternet formation and reconfiguration, scheduling, and routing issues. View full abstract»

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  • Optical burst switching for the next generation Internet

    Page(s): 40 - 43
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    Demands for network bandwidth increase daily. In order to meet our ever-increasing network bandwidth needs, one solution is to design and build the next generation Internet with an optical core infrastructure, with last connection provisioning time and unprecedented high data rates of 100 terabits per second and higher. An optical network is built by interconnecting various optical switches with wavelength-division multiplexing (WDM) fibers, i.e., fibers that can simultaneously transmit data over different wavelengths. Many of today's commercial optical networks, however, do not utilize the WDM technology efficiently. With respect to the current state of the technology, an Optical Burst Switched (OBS) Network is one of the most promising all-optical architectures for the next generation Internet. It efficiently supports the transmission of bursty traffic over an all-optical infrastructure. OBS is still being developed and it has not been standardized yet. This article describes the main features of an OBS network, its benefits as well as its challenges. View full abstract»

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  • A brief intro to metamaterials

    Page(s): 44 - 46
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    Metamaterials are new artificial materials with unusual electromagnetic properties that are not found in naturally occurring materials. All "natural" materials such as glass, diamond and such have positive electrical permittivity, magnetic permeability and an index of refraction. In these new artificially fabricated materials - termed as negative index materials (NIM) or double negative (ONG) media or left handed (LH) materials or backward wave (BW) media - all these material parameters are negative. With these unusual material parameters, new kinds of miniaturized antennas and microwave components/devices can be created for the wireless communications and the defense industries. The electrical permittivity and the magnetic permeability are the main determinants of a material's response to electromagnetic (EM) waves. In metamaterials, both these material parameters are negative. Correspondingly, the refractive index of the metamaterials is also negative. Another strange property of metamaterials is its reverse Doppler effect. View full abstract»

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  • Restoring David using 3D

    Page(s): 4 - 7
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    Refurbishing Michelangelo's David has produced several useful restoration guidelines. These guidelines can help restorers select the proper procedures for the task and, objectively, assess the results. The work also has helped us develop innovative ways to process and visualize 3D data in cultural heritage projects. The David restoration was an ideal test bed. We try various methodologies to support restorers and scientists with visualization tools based on 3D digital models. 3D digital models can be a tool for undertaking specific investigations, or as supporting media for archiving and integrating the restoration-related information. View full abstract»

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  • Editorial

    Page(s): 3
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  • Resource sharing

    Page(s): 14 - 16
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    Computer networking is an attempt to end the ''tyranny of geography". The goal is to make all data available to any system connected anywhere in the network. In a more compact form, it is known as "resource sharing". The remote compilers' concept permits a software package to be shared on the network using client-server and peer-to-peer networks. This setup allows the users to compile the source file wherever the required compiler is installed in the network. A remote compiler is a software tool that takes the source file as input and sends it to the host where the required compiler is installed. The source files are automatically compiled at the host. The compiled/error files then are sent back to the client. This setup basically only works for compilers having command-line debugging and execution, and multimedia renderings. View full abstract»

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  • Learning object-oriented design by creating games

    Page(s): 11 - 13
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    Playing computer games is a popular recreational activity for young people. Creating a state-of-the-art commercial computer game is an incredibly difficult task. Writing a game like Pac-Man from scratch in a modern programming language is still difficult. Fortunately, several currently available tools make game creation easier. These tools can be used to create more complex games, but they offer only limited programming possibilities. Many similar packages exist. One such program is Game Maker, which is a rapid-application development tool. The Game Maker interface uses an object-oriented, event-driven approach. With Game Maker's drag-and-drop techniques, users can create games without writing a single line of code. But the program also includes an interpreted programming language. The program produces stand-alone games that can be distributed freely: a version of Game Maker, itself, is available for free as well. View full abstract»

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  • A crisis in oversight [Special section]

    Page(s): 17 - 32
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  • Gamesman problems / Gamesman solutions

    Page(s): 48 - 47
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    Page(s): 03
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Aims & Scope

IEEE Potentials is the magazine dedicated to undergraduate and graduate students and young professionals.

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Meet Our Editors

Editor-in-Chief
David Tian
Carnegie Mellon University
david.tian@ieee.org