Improving the Performance of the Wireless Data Broadcast by the Cyclic Indexing Schemes

Abstract. Wireless data broadcast is an effective approach to disseminate information to a massive number of users. Indexing techniques for broadcasting data can reduce the battery power consumptions of mobile terminals by decreasing the tuning time. The organization of the indexes affects the efficiency of data searching. We investigate how the degree of the index node affects the tuning time, and thus minimize the power c o n s u mp t i o n o f u s e r ' s terminals. We proposed a performance measurement for the tuning time and a cyclic indexing algorithm. The numerical results suggest the degree of an index node be 3 when the access probabilities of the data tend to be uniformly distributed so that the expected tuning time is minimal. When the access distribution of the data nodes is skewer, the tuning time can be minimized by setting the degree in the index node 2

Low Memory Bandwidth Prediction Method for H.264/AVC Scalable Video Extension

Memory bandwidth issue becomes more and more critical in designing video coding system especially in scalable video coding due to its extra inter-layer prediction. This paper proposes a low memory bandwidth prediction method for inter and inter-layer residual prediction. The proposed method combines two predictions into one prediction process and reuses its data for lowering memory bandwidth requirements. The simulation results show that 67% of memory bandwidth in enhancement layer can be reduced with negligible rate distortion loss.APSIPA ASC 2009: Asia-Pacific Signal and Information Processing Association, 2009 Annual Summit and Conference. 4-7 October 2009. Sapporo, Japan. Poster session: Advanced Circuits and Systems/VLSI (5 October 2009)

Memory Analysis for H.264/AVC Scalable Extension Decoder

In this paper, a systematic analysis for memory usage in H.264/AVC scalable extension (SVC) decoder is presented. This paper analyzes the memory requirements with three different decoding flows, macroblock, row and frame based, to find out a best method which can achieve optimal trade-off between internal memory usage and external memory access. The analysis shows that the SVC decoding needs 88% to 110% extra memory bandwidth compared to single layer H.264 decoding due to inter-layer prediction disregarding of decoding flow. However, extra internal memory storage by inter-layer prediction varies a lot according to the flow. This analysis could provide as a foundation to design a SVC decoder for further step.APSIPA ASC 2009: Asia-Pacific Signal and Information Processing Association, 2009 Annual Summit and Conference. 4-7 October 2009. Sapporo, Japan. Poster session: Advanced Circuits and Systems/VLSI (5 October 2009)

An Efficient Mode Decision Scheme by using RD Cost Correlation Coefficients in Scalable Video Coding

Scalable video coding (SVC) achieves layered coding structure with adaptive inter-layer prediction which causes high computational complexity. To decrease the computational complexity of SVC, we present a fast algorithm to speed up the inter-mode decision process for SVC. The proposed algorithm early terminates inter-mode decision in the enhancement layer by estimating the rate-distortion (RD) cost from the macroblocks of the base layer and the enhancement layer in temporal, spatial and inter-layer directions. Moreover, a search range decision algorithm is also proposed in this paper to further increase the motion estimation speed by using the motion vector information from temporal, spatial or inter-layer domain. The simulation results show that the proposed algorithm can determine the best mode and provide up to 75% of total coding time saving with 2.2% of bit rate increasing and 0.08dB PSNR degradation in average compared to JSVM 9.10.APSIPA ASC 2009: Asia-Pacific Signal and Information Processing Association, 2009 Annual Summit and Conference. 4-7 October 2009. Sapporo, Japan. Oral session: Image and Video Coding (5 October 2009)

Balanced Topology NEMO Construction for the Internet-Based MANET

International audienceL'effet dévolutif de l'appel interdit au juge d'appel de statuer sur une demande de mainlevée de la mesure de protection formée pour la première fois devant elle quand elle n'est saisie que de l'appel d'une ordonnance portant changement de protecteur. Le juge des tutelles ne peut ordonner la mainlevée d'une mesure de protection juridique que s'il constate que les causes ayant justifié son ouverture ont disparu