In multimedia conference, the capability of audio processing is basic and requires more for real-time criteria. In this article, we categorize and analyze the schemes, and provide several multipoint speech audio mixin...In multimedia conference, the capability of audio processing is basic and requires more for real-time criteria. In this article, we categorize and analyze the schemes, and provide several multipoint speech audio mixing schemes using weighted algorithm, which meet the demand of practical needs for real-time multipoint speech mixing, for which the ASW and AEW schemes are especially recommended. Applying the adaptive algorithms, the high-performance schemes we provide do not use the saturation operation widely used in multimedia processing. Therefore, no additional noise will be added to the output. The above adaptive algorithms have relatively low computational complexity and good hearing perceptibility. The schemes are designed for parallel processing, and can be easily implemented with hardware, such as DSPs, and widely applied in multimedia conference systems.展开更多
To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS...To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS and the existing 3GPP service triggering algorithm （STA） based on initial filter eriteria （iFC） increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performanee, a SIP response message based filter criteria （rFC） was proposed. Based on the rFC, a SIP response message based STA （RSTA） was further proposed. The modeling and theoretical analysis of 3GPP STA and RSTA were presented. Simulation results show that, compared with 3GPP STA, the RSTA can avoid the additional signaling traffie load of the S-CSCF and application server （AS） effectively, reduce the session setup delay eonsiderably, increase the throughput of the S-CSCF and improve the quality of service （QoS） of IMS network.展开更多
Service-Oriented Communication(SOC)is a key research issue to enable media communications using the Service-Oriented Architecture(SOA).Motivated by the necessity to guarantee the service quality of our webbased multim...Service-Oriented Communication(SOC)is a key research issue to enable media communications using the Service-Oriented Architecture(SOA).Motivated by the necessity to guarantee the service quality of our webbased multimedia conferencing system,we present a Comprehensively Context-Aware(CoCA)approach in this paper.One major problem in the existing end-to-end Quality of Service(QoS)management solutions is that they analyse and exploit the relationships between the QoS metrics and corresponding contexts in an isolated manner.In this paper,we propose a novel approach to leveraging such relationships in a comprehensive manner based on Bayesian networks and the fuzzy set theory.This approach includes three phases:1)information feedback and training,2)QoS-to-context mapping,and3)optimal context adaption.We implement the proposed CoCA in the real multimedia conferencing system and compare its performance with the existing bandwidth aware and playback buffer aware schemes.Experimental results show that the proposed CoCA outperforms the competing approaches in improving the average video Peak Signal-to-Noise Ratio(PSNR).It also exhibits good performance in preventing the playback buffer starvation.展开更多
This paper discusses the strengths of using the intemet and building corpus in interpretation teaching. The authors propose multi-media assisted interpretation teaching strategies such as building a small -sized contr...This paper discusses the strengths of using the intemet and building corpus in interpretation teaching. The authors propose multi-media assisted interpretation teaching strategies such as building a small -sized controlled internal interpretation corpus, encouraging students to search information via the internet, and conducting teacher-student, student-student communication at all levels via E-mall, BBS, skype-in-English, audio/video conference and etc.展开更多
The Labor Contract Law classifies collective contracts as special labor contracts, ignoring the fundamental differences between collective contracts and labor contracts. This has plunged it into jurisprudential obstac...The Labor Contract Law classifies collective contracts as special labor contracts, ignoring the fundamental differences between collective contracts and labor contracts. This has plunged it into jurisprudential obstacles and institutional difficulties. In terms of the main entities, efficacy, dispute settlement mechanisms, etc. collective contracts have their own institutional characteristics. They should be incorporated into the legislative framework for collective labor relations in future legislation, and should link up with trade unions, collective consultation and collective dispute settlement to form a complete system of collective labor law.展开更多
文摘In multimedia conference, the capability of audio processing is basic and requires more for real-time criteria. In this article, we categorize and analyze the schemes, and provide several multipoint speech audio mixing schemes using weighted algorithm, which meet the demand of practical needs for real-time multipoint speech mixing, for which the ASW and AEW schemes are especially recommended. Applying the adaptive algorithms, the high-performance schemes we provide do not use the saturation operation widely used in multimedia processing. Therefore, no additional noise will be added to the output. The above adaptive algorithms have relatively low computational complexity and good hearing perceptibility. The schemes are designed for parallel processing, and can be easily implemented with hardware, such as DSPs, and widely applied in multimedia conference systems.
基金Supported by National Science Fund for Distinguished Young Scholars (No. 60525110)National Basic Research Program of China (No.2007CB307100, 2007CB307103)+1 种基金Program for New Century Excellent Talents in University (No. NCET-04-0111 )Development Fund Project for Electronic and Information Industry (Mobile Service and Application System Based on 3G)
文摘To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS and the existing 3GPP service triggering algorithm （STA） based on initial filter eriteria （iFC） increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performanee, a SIP response message based filter criteria （rFC） was proposed. Based on the rFC, a SIP response message based STA （RSTA） was further proposed. The modeling and theoretical analysis of 3GPP STA and RSTA were presented. Simulation results show that, compared with 3GPP STA, the RSTA can avoid the additional signaling traffie load of the S-CSCF and application server （AS） effectively, reduce the session setup delay eonsiderably, increase the throughput of the S-CSCF and improve the quality of service （QoS） of IMS network.
基金supported by the NationalBasic Research Program of China(973 Program)under Grants No.2011CB302506,No.2011CB302704,No.2012CB315802the National Key Technologies Research and Development Program of China"Research on theMobile Community Cultural Service Aggregation Supporting Technology"under Grant No.2012BAH94F02+5 种基金the Novel Mobile ServiceControl Network Architecture and Key Technologies under Grant No.2010ZX03004001-01the National High Technical Researchand Development Program of China(863 Program)under Grant No.2013AA102301the National Natural Science Foundation of Chinaunder Grants No.61003067,No.61171102,No.61001118,No.61132001Program for NewCentury Excellent Talents in University underGrant No.NCET-11-0592the Project of NewGeneration Broadband Wireless Network under Grant No.2011ZX03002-002-01the Beijing Nova Program under Grant No.2008B50
文摘Service-Oriented Communication(SOC)is a key research issue to enable media communications using the Service-Oriented Architecture(SOA).Motivated by the necessity to guarantee the service quality of our webbased multimedia conferencing system,we present a Comprehensively Context-Aware(CoCA)approach in this paper.One major problem in the existing end-to-end Quality of Service(QoS)management solutions is that they analyse and exploit the relationships between the QoS metrics and corresponding contexts in an isolated manner.In this paper,we propose a novel approach to leveraging such relationships in a comprehensive manner based on Bayesian networks and the fuzzy set theory.This approach includes three phases:1)information feedback and training,2)QoS-to-context mapping,and3)optimal context adaption.We implement the proposed CoCA in the real multimedia conferencing system and compare its performance with the existing bandwidth aware and playback buffer aware schemes.Experimental results show that the proposed CoCA outperforms the competing approaches in improving the average video Peak Signal-to-Noise Ratio(PSNR).It also exhibits good performance in preventing the playback buffer starvation.
文摘This paper discusses the strengths of using the intemet and building corpus in interpretation teaching. The authors propose multi-media assisted interpretation teaching strategies such as building a small -sized controlled internal interpretation corpus, encouraging students to search information via the internet, and conducting teacher-student, student-student communication at all levels via E-mall, BBS, skype-in-English, audio/video conference and etc.
基金the 57th batch of funding projects(No.2015M570067)supported by the China Postdoctoral Science Fund
文摘The Labor Contract Law classifies collective contracts as special labor contracts, ignoring the fundamental differences between collective contracts and labor contracts. This has plunged it into jurisprudential obstacles and institutional difficulties. In terms of the main entities, efficacy, dispute settlement mechanisms, etc. collective contracts have their own institutional characteristics. They should be incorporated into the legislative framework for collective labor relations in future legislation, and should link up with trade unions, collective consultation and collective dispute settlement to form a complete system of collective labor law.
