The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those str...The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those streams into H.264 in these applications. Unfortunately, the huge complexity keeps transcoding from being widely used in practical applications. This paper proposes an efficient transcoding architecture with a smart downscaling decoder and a fast mode decision algorithm. Using the proposed architecture, huge buffering memory space is saved and the transcoding complexity is reduced. Performance of the proposed fast mode decision algorithm is validated by experiments.展开更多
Lie symmetry reduction of some truly ＂variable coefficient＂ wave equations which are singled out from a class of （1 ＋ 1）-dimensional variable coefficient nonlinear wave equations with respect to one and two-dimen...Lie symmetry reduction of some truly ＂variable coefficient＂ wave equations which are singled out from a class of （1 ＋ 1）-dimensional variable coefficient nonlinear wave equations with respect to one and two-dimensional algebras is carried out. Some classes of exact solutions of the investigated equations are found by means of both the reductions and some modern techniques such as additional equivalent transformations and hidden symmetries and so on. Conditional symmetries are also discussed.展开更多
The paper reports on a study of young L2 （second language） English learners＇ dual code use as activated through a series of specially designed guided fantasies. The original concept of guided fantasies as a monolin...The paper reports on a study of young L2 （second language） English learners＇ dual code use as activated through a series of specially designed guided fantasies. The original concept of guided fantasies as a monolingually organised relaxation technique was extended to the area of bilingual reception and production. The goal was to examine the relationship between child imaginative faculty and a tendency to transfer understandings across the L1 （first language） and L2. The research consisted in exposing a class of I 0 nine-year-old children to eight guided fantasies expected to playfully attract their conscious attention to language properties and enable them to profit from L1 knowledge in L2 learning. The data were collected through the heuristically oriented qualitative study drawing on participant observation accompanied by field notes and recordings of student behaviours. The findings highlighted guided fantasies in their redefined form as a useful tool for encouraging young learners to rely on L 1 competence in making sense of L2 underlying principles.展开更多
In this paper, architecture of softswitch-based Next Generation Network (NGN) system and Session Initiation Protocol (SIP) are studied briefly, and the problems on the openness and extensibility of normal remote video...In this paper, architecture of softswitch-based Next Generation Network (NGN) system and Session Initiation Protocol (SIP) are studied briefly, and the problems on the openness and extensibility of normal remote video-monitoring system (RVMS) are analyzed. Then a RVMS framework model based on softswitch is given. Furthermore, designation and realization of the system based on T 6000 Softswitch Platform is provided. The innovation is considering the RVMS as a part of softswitch system. It is a feasible scheme for implementing next generation video-monitoring system based on broadband IP technique.展开更多
基金Project (No. CNGI-04-15-2A) supported by the China Next Gen-eration Internet (CNGI)
文摘The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those streams into H.264 in these applications. Unfortunately, the huge complexity keeps transcoding from being widely used in practical applications. This paper proposes an efficient transcoding architecture with a smart downscaling decoder and a fast mode decision algorithm. Using the proposed architecture, huge buffering memory space is saved and the transcoding complexity is reduced. Performance of the proposed fast mode decision algorithm is validated by experiments.
基金Supported by the National Key Basic Research Project of China under Grant No.2010CB126600the National Natural Science Foundation of China under Grant No.60873070+2 种基金Shanghai Leading Academic Discipline Project No.B114the Postdoctoral Science Foundation of China under Grant No.20090450067Shanghai Postdoctoral Science Foundation under Grant No.09R21410600
文摘Lie symmetry reduction of some truly ＂variable coefficient＂ wave equations which are singled out from a class of （1 ＋ 1）-dimensional variable coefficient nonlinear wave equations with respect to one and two-dimensional algebras is carried out. Some classes of exact solutions of the investigated equations are found by means of both the reductions and some modern techniques such as additional equivalent transformations and hidden symmetries and so on. Conditional symmetries are also discussed.
文摘The paper reports on a study of young L2 （second language） English learners＇ dual code use as activated through a series of specially designed guided fantasies. The original concept of guided fantasies as a monolingually organised relaxation technique was extended to the area of bilingual reception and production. The goal was to examine the relationship between child imaginative faculty and a tendency to transfer understandings across the L1 （first language） and L2. The research consisted in exposing a class of I 0 nine-year-old children to eight guided fantasies expected to playfully attract their conscious attention to language properties and enable them to profit from L1 knowledge in L2 learning. The data were collected through the heuristically oriented qualitative study drawing on participant observation accompanied by field notes and recordings of student behaviours. The findings highlighted guided fantasies in their redefined form as a useful tool for encouraging young learners to rely on L 1 competence in making sense of L2 underlying principles.
文摘In this paper, architecture of softswitch-based Next Generation Network (NGN) system and Session Initiation Protocol (SIP) are studied briefly, and the problems on the openness and extensibility of normal remote video-monitoring system (RVMS) are analyzed. Then a RVMS framework model based on softswitch is given. Furthermore, designation and realization of the system based on T 6000 Softswitch Platform is provided. The innovation is considering the RVMS as a part of softswitch system. It is a feasible scheme for implementing next generation video-monitoring system based on broadband IP technique.
