Browsing by Author "Huang, MY"

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A robust MPEG-21 media delivery video streaming system
(2004)
Su, TL
;
Huang, MY
;
Chuang, HC
;
Wang, CN
;
Chiang, TH
MPEG-21 provides a unified solution, Universal Multimedia Access (UMA), for constructing a multimedia content delivery and rights management framework. Based on the concepts of UMA, we build a simplified UMA model for Internet and over wireless LAN. In this framework, the source video material is encoded and archived as MPEG-4 bitstreams. Moreover, novel intra refresh and error resilience schemes are used to improve the coding efficiency and robustness of the delivered bitstreams. Consequently, the multimedia information can be streamed through the transmission channels with packet losses. The recovered images have insignificant quality degradations for similar streaming systems. To have a more strict evaluation methodology according to the specified common conditions for MPEG-21 media delivery, a unicast streaming system is built on MPEG-21 part-13 Multimedia Test Bed for Resource Delivery. The results show that we can retain significantly improved subjective quality for video streaming over the Internet and wireless channels.
Transport and optical studies of the D--conduction band in doped GaAs/AlGaAs quantum wells
(2001-08-01)
Lee, CH
;
Chang, YH
;
Huang, CF
;
Huang, MY
;
Lin, HH
The properties of D- ions in quantum wells were studied. It is found that, with an intermediate concentration of D- ions, electrons in the quantum wells possess both band-like and impurity-like properties. The appearance of the Quantum Hall effect makes it possible to rule out the existence of an impurity band that is separated from the conduction band. The results are interpreted in terms of the formation of a D- conduction band, with the D- band becoming a tail of the conduction band. The implications of our experimental results on the metal-insulator transitions in doped semiconductors are discussed.