Int. J. Digit. Multim. Broadcast.最新文献_第9页

Performance Evaluation of an Object Management Policy Approach for P2P Networks 一种P2P网络对象管理策略方法的性能评估

Int. J. Digit. Multim. Broadcast. Pub Date : 2012-02-07 DOI: 10.1155/2012/189325

Dario Vieira, C. Melo, Y. Ghamri-Doudane

{"title":"Performance Evaluation of an Object Management Policy Approach for P2P Networks","authors":"Dario Vieira, C. Melo, Y. Ghamri-Doudane","doi":"10.1155/2012/189325","DOIUrl":"https://doi.org/10.1155/2012/189325","url":null,"abstract":"The increasing popularity of network-based multimedia applications poses many challenges for content providers to supply efficient and scalable services. Peer-to-peer (P2P) systems have been shown to be a promising approach to provide large-scale video services over the Internet since, by nature, these systems show high scalability and robustness. In this paper, we propose and analyze an object management policy approach for video web cache in a P2P context, taking advantage of object's metadata, for example, video popularity, and object's encoding techniques, for example, scalable video coding (SVC). We carry out trace-driven simulations so as to evaluate the performance of our approach and compare it against traditional object management policy approaches. In addition, we study as well the impact of churn on our approach and on other object management policies that implement different caching strategies. A YouTube video collection which records over 1.6 million video's log was used in our experimental studies. The experiment results have showed that our proposed approach can improve the performance of the cache substantially. Moreover, we have found that neither the simply enlargement of peers' storage capacity nor a zero replicating strategy is effective actions to improve performance of an object management policy.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127236926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Multi-Objective Genetic Algorithm for Task Assignment on Heterogeneous Nodes 异构节点任务分配的多目标遗传算法

Int. J. Digit. Multim. Broadcast. Pub Date : 2012-01-19 DOI: 10.1155/2012/716780

C. Blanch, R. Baert, M. D'Hondt

引用次数: 10

Towards an Automatic Parameter-Tuning Framework for Cost Optimization on Video Encoding Cloud 基于视频编码云的成本优化自动参数调优框架

Int. J. Digit. Multim. Broadcast. Pub Date : 2012-01-18 DOI: 10.1155/2012/935724

Xiaowei Li, Yi Cui, Yuan Xue

{"title":"Towards an Automatic Parameter-Tuning Framework for Cost Optimization on Video Encoding Cloud","authors":"Xiaowei Li, Yi Cui, Yuan Xue","doi":"10.1155/2012/935724","DOIUrl":"https://doi.org/10.1155/2012/935724","url":null,"abstract":"The emergence of cloud encoding services facilitates many content owners, such as the online video vendors, to transcode their digital videos without infrastructure setup. Such service provider charges the customers only based on their resource consumption. For both the service provider and customers, lowering the resource consumption while maintaining the quality is valuable and desirable. Thus, to choose a cost-effective encoding parameter, configuration is essential and challenging due to the tradeoff between bitrate, encoding speed, and resulting quality. In this paper, we explore the feasibility of an automatic parameter-tuning framework, based on which the above objective can be achieved. We introduce a simple service model, which combines the bitrate and encoding speed into a single value: encoding cost. Then, we conduct an empirical study to examine the relationship between the encoding cost and various parameter settings. Our experiment is based on the one-pass Constant Rate Factor method in x264, which can achieve relatively stable perceptive quality, and we vary each parameter we choose to observe how the encoding cost changes. The experiment results show that the tested parameters can be independently tuned to minimize the encoding cost, which makes the automatic parameter-tuning framework feasible and promising for optimizing the cost on video encoding cloud.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"131 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122371790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Multi-Resolution Multimedia QoE Models for IPTV Applications IPTV应用的多分辨率多媒体QoE模型

Int. J. Digit. Multim. Broadcast. Pub Date : 2012-01-12 DOI: 10.1155/2012/904072

P. Calyam, P. Chandrasekaran, G. Trueb, N. Howes, R. Ramnath, Delei Yu, Y. Liu, L. Xiong, Daoyan Yang

引用次数: 37

Cyber Security for Smart Grid, Cryptography, and Privacy 智能电网、密码学和隐私的网络安全

Int. J. Digit. Multim. Broadcast. Pub Date : 2011-10-04 DOI: 10.1155/2011/372020

Swapna Iyer

引用次数: 51

M2M Communications in the Smart Grid: Applications, Standards, Enabling Technologies, and Research Challenges 智能电网中的M2M通信:应用、标准、使能技术和研究挑战

Int. J. Digit. Multim. Broadcast. Pub Date : 2011-08-04 DOI: 10.1155/2011/289015

S. Tan, M. Sooriyabandara, Z. Fan

引用次数: 49

A Survey of Linear Network Coding and Network Error Correction Code Constructions and Algorithms 线性网络编码与网络纠错码结构与算法综述

Int. J. Digit. Multim. Broadcast. Pub Date : 2011-07-12 DOI: 10.1155/2011/857847

M. Sanna, E. Izquierdo

引用次数: 14

BVS: A Lightweight Forward and Backward Secure Scheme for PMU Communications in Smart Grid BVS:智能电网中PMU通信的一种轻量级正向和反向安全方案

Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-30 DOI: 10.1155/2011/382147

Wei Ren, Jun Song, Min Lei, Yi Ren

引用次数: 3

Gaussian Pulse-Based Two-Threshold Parallel Scaling Tone Reservation for PAPR Reduction of OFDM Signals 基于高斯脉冲的二阈值平行标度保留OFDM信号的PAPR降低

Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-30 DOI: 10.1155/2011/470310

L. Guan, A. Zhu

{"title":"Gaussian Pulse-Based Two-Threshold Parallel Scaling Tone Reservation for PAPR Reduction of OFDM Signals","authors":"L. Guan, A. Zhu","doi":"10.1155/2011/470310","DOIUrl":"https://doi.org/10.1155/2011/470310","url":null,"abstract":"Tone Reservation (TR) is a technique proposed to combat the high Peak-to-Average Power Ratio (PAPR) problem of Orthogonal Frequency Division Multiplexing (OFDM) signals. However conventional TR suffers from high computational cost due to the difficulties in finding an effective cancellation signal in the time domain by using only a few tones in the frequency domain. It also suffers from a high cost of hardware implementation and long handling time delay issues due to the need to conduct multiple iterations to cancel multiple high signal peaks. In this paper, we propose an efficient approach, called two-threshold parallel scaling, for implementing a previously proposed Gaussian pulse-based Tone Reservation algorithm. Compared to conventional approaches, this technique significantly reduces the hardware implementation complexity and cost, while also reducing signal processing time delay by using just two iterations. Experimental results show that the proposed technique can effectively reduce the PAPR of OFDM signals with only a very small number of reserved tones and with limited usage of hardware resources. This technique is suitable for any OFDM-based communication systems, especially for Digital Video Broadcasting (DVB) systems employing large IFFT/FFT transforms.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116341529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Building Automation Networks for Smart Grids 智能电网楼宇自动化网络

Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-15 DOI: 10.1155/2011/926363

Peizhong Yi, A. Iwayemi, Chi Zhou

引用次数: 17