Thesis (M. Phil.)--University of Hong Kong, 1977.

No description available.

Advances in wireless technology will soon provide sufficient capacity for the transmission of compressed video to and from mobile terminals. However, high compression ratios and the use of Variable Length Coding in standards such as H.263 and MPEG-4 make the encoded bitstreams particularly sensitive to errors. This thesis investigates methods for the error robust transmission of MPEG-4 coded video over mobile networks. It examines curent and future mobile networks, and discusses the quality of service that they are expected to offer with respect to mobile multimedia. Also, the MPEG-4 systems and visual layer standards are briefly described. Real-time MPEG-4 encoder and decoder software has been developed and exploited in the work described here. The MPEG-4 software can send MPEG-4 data over TCP or over RTP. All of the standard MPEG•4 error resilience options are implemented in the software. The effectiveness of these options is demonstrated through the results of simulated transmission over a GPRS channel. MPEG•4 is separated into two different streams via exploitation of the data partitioning option. The two streams may then be transmitted over a mobile network using different bearer channels. The most sensitive data stream is sent using a bearer channel with a low bit error rate compared to the less sensitive data stream. This technique is shown to produce quality improvements. A technique for the insertion of user-defined data is outlined. Insertion of user- defined data is achieved while retaining backwards compatibility with existing standard MPEG- 4 decoders. CRC codes are inserted using this scheme, to facilitate more accurate detection of errors. This error detection aids error concealment and results in a gain in decoded video quality after simulated transmission over a GPRS channel. Motion adaptive encoding is employed to increase the error robustness of the encoded bitstream. Video packet size and Intra block refresh rates are altered with first partition size, which is used as a guide to the amount of motion within a scene. 1Tansmlssion of video using RTP is considered. In particular, a mathematical analysis is performed for two different packetisation schemes. One scheme encapsulates one video frame within one RTP packet, while the other scheme encapsulates a single video packet within a single RTP packet.

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1911. / The entire thesis text is included in file. Typescript. Illustrated by authors. Title from title screen of thesis/dissertation PDF file (viewed March 24, 2009)

Thesis (M.S.)--University of Missouri, School of Mines and Metallurgy, 1912. / The entire thesis text is included in file. Typescript. Illustrated by authors. Title from title screen of thesis/dissertation PDF file (viewed March 26, 2009)

Thesis (M.Phil.)--University of Hong Kong, 1977. / Also available in print.

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1910. / The entire thesis text is included in file. Typescript. Illustrated by authors. Title from title screen of thesis/dissertation PDF file (viewed March 11, 2009)

Thesis (Ph. D.)--University of Wisconsin--Madison, 1965. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Typically, instructional designers introduce audio in multimedia environments when a) it appears to be necessary -- for example, to provide feedback; or b) accessibility, availability, and/or hardware issues are insignificant -- in other words, It's there -- -- It sounds good -- It should work -- Why not use it? However, rarely is a decision to use audio based upon a thorough understanding of why, from a learning perspective, it is appropriate or optimal to do so. Clearly a lack of such an understanding can, and often does, lead to the inappropriate use of audio as a useful instructional medium. This study is designed: (1) to investigate the educational value of compressed speech in a multimedia environment, and (2) to evaluate how rate of speech may influence learning in a multimedia setting. It is also concerned with ascertaining whether: a) the recall of information at various levels of compressed speech decreases when audio delivery-rate (words-per-minute) increases; b) there is an interaction between task completion time and recall of information at various levels of compression; and c) relative to recall, there is an interaction between audio delivery-rate and increasing exposure to an audio stimulus. One hundred and ninety-two undergraduate students enrolled in business courses in two southeastern regional universities located in North Carolina and Virginia were randomly assigned to one of three groups. The three experimental test groups were normal speech, 125 words per minute, compressed speech: 175 words per minute and 200 words per minute. In all groups, participants were asked to listen to the solution of the puzzle, given in one of the three presentation rates of speech and they were given three different puzzles to solve. All data were collected at each assigned computer workstation. Data analysis revealed a difference between the three treatment groups (125 wpm, 175 wpm, 200 wpm) in recall scores due to the rate of compression, no interaction between completion times and the recall of information based on compression rate, and a difference in recall scores between the three treatment groups and the amount of exposure to the audio stimulus. / Ph. D.

Wood composites industry has been growing for decades. However, wood composites have been associated with some health concerns due to the presence of formaldehyde. A promising bio-based resin Epoxidized Sucrose Soyate (ESS) was investigated as a potential primary binder in particleboards. The goal of this research was to find a strong and durable resin for wood composites. Several ESS-MDI based formulas were found that were able to match the performance criteria for particleboard. / North Dakota Soybean Council