The communique system for cellular communication networks operates with existing cellular communication networks to provide communique communication services to subscribers. The communique can be unidirectional (broadcast) or bidirectional (interactive) in nature and the extent of the communique can be network-wide broadcast or narrowcast, where one or more cells and/or cell sectors are grouped to cover a predetermined geographic area or demographic population or subscriber interest group to transmit information to subscribers who populate the target audience for the narrowcast transmissions. The communique system for cellular communication networks can dynamically allocate the available bandwidth to thereby serve subscribers with more control channel(s) and/or control channel bandwidth and/or communication channels and/or communication channels of greater bandwidth as the need presents itself. The dynamic bandwidth allocation can simultaneously occur in multiple domains: time, code, frequency to thereby serve the needs of the subscribers to receive Communiques. The content of these transmissions can be multi-media in nature and comprising a combination of various forms of media: audio, video, graphics, text, data and the like. The subscriber terminal devices used to communicate with the communique system for cellular communication networks are typically full function communication devices that include: WAP enabled cellular telephones, personal digital assistants, Palm Pilots, personal computers, and the like or special communique only communication devices that are specific to communique reception; or MP3 audio players (essentially a radio receiver or communique radio); or an MPEG4 video receiver (communique TV); or other such specialized communication device.

Communique system with dynamic bandwidth allocation in cellular communication networks

Monitoring and Adaptive Control of Laser Processes

The communique system for cellular communication networks operates with existing cellular communication networks to provide communique communication services to subscribers. The communique system uses active feedback to dynamically adjust the communique coverage area, using one or more parameters including but not limited to: the number of subscribers in the communique coverage area and components thereof, the demographics of the subscribers, the flow of subscribers into & out of existing communique coverage area, the usage of communique services: free vs. subscription vs. toll, and the like. The content of these transmissions can be multi-media in nature and comprising a combination of various forms of media: audio, video, graphics, text, data and the like.

Communique system with active feedback for cellular communication networks

The wireless subscriber device that is operable in a communique system for cellular communication networks operates with existing cellular communication networks to provide communique communication services to subscribers. The wireless subscriber devices used to communicate with the communique system for cellular communication networks are typically full function communication devices that include: WAP enabled cellular telephones, personal digital assistants, Palm Pilots, personal computers, and the like or special communique only communication devices that are specific to communique reception; or MP3 audio players (essentially a radio receiver or communique radio); or an MPEG4 video receiver (communique TV); or other such specialized communication device.

Communique wireless subscriber device for a cellular communication network

Streaming media, such as audio or video files, is sent via the Internet. The media are immediately played on a user's computer. Audio/video data is transmitted from the server more rapidly than it is played out by the user system. The audio/video data in the user buffer accumulates; and interruptions in playback as well as temporary modem delays are avoided.

Streaming media buffering system

A modified center position detection algorithm of the spot image for the Shack–Hartmann wavefront sensor was experimentally investigated. The modified center of weight algorithm uses some power from the gray level intensity of the spot images instead of the gray level intensity itself. From the experiments, the repeatability and accuracy of the center position detection of the spot images which used the algorithm were improved when compared with those using the conventional center of weight algorithm. Applications of the algorithm to the measurement of the displacement of the spot images of the Shack–Hartmann wavefront sensor and the experimental results of the closed-loop wavefront correction are described in this paper.

A center detection algorithm for Shack–Hartmann wavefront sensor

In situ laser-based resonant ultrasound spectroscopy is used to characterize the development of a recrystallized microstructure in a high purity copper sample. The modal shapes, used for mode identification, of several resonant modes are determined before and after annealing by raster scanning the laser interferometric probe. This information is used to isolate the motion of individual modes during high temperature annealing. The evolution of a particular mode during annealing is examined in detail. During recrystallization, the center frequency of this mode shifts by approximately 20% of the original value. Using electron backscatter data it is shown that the majority of this shift is due to changes in the polycrystal average elastic stiffness tensor, driven by changes in texture, and that changes in dislocation density and pinning length are secondary influences.

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In situ laser-based resonant ultrasound measurements of microstructure mediated mechanical property evolution

We present a mechanism of multimedia synchronization for smooth play back of streams in a mobile environment. This mechanism contains an effective buffering method and playout control not only to provide seamless playback of a media stream, but also to minimize the effect of wireless network characteristics. To implement this in a mobile computing environment, we adopted a proxy concept for separating wireless and wired networks. This proxy puts the streams into the buffers from a server and sends them to mobile hosts. It does QoS negotiation with user applications if the network cannot support the required QoS. The proposed buffering method keeps the continuous play of a media stream using a feedback mechanism and playout control provides more natural multimedia presentation by adjusting the frame duration on-screen. Experimental results show that our synchronization scheme provides a constant playback rate even in the frequent short time disconnection and some buffering control parameters affect playback performance by some degree.

Adaptive multimedia stream presentation in mobile computing environment

The measuring resolution and speed for wavefront are important to improve the performance of an adaptive optics system. In this paper, we propose a fast measuring technique with high resolution in the Shack–Hartmann wavefront sensor. The proposed measuring technique of wavefront combines the conventional center of mass algorithm with an estimated weighting factor. The estimated weighting factor is a real value anticipating the real center of mass in a wavefront spot image. This estimated weighting factor can be calculated at the initialization step of an adaptive optics system. We designed a robust adaptive optics system with this proposed measuring algorithm. The measuring accuracy and speed are investigated by using the proposed algorithm compared with the conventional center of mass algorithm in experiments.

Seung-Kyu Park

Papers

A center detection algorithm for Shack–Hartmann wavefront sensor

In situ laser-based resonant ultrasound measurements of microstructure mediated mechanical property evolution

Adaptive multimedia stream presentation in mobile computing environment

A study on a fast measuring technique of wavefront using a Shack Hartmann sensor

Underwater laser cutting of stainless steel up to 100 mm thick for dismantling application in nuclear power plants