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检索条件"任意字段=Conference on Multimedia Computing and Networking"

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Integrated multimedia understanding for ubiquitous intelligence based on mental image directed semantic theory

引用

International conference on Embedded and Ubiquitous computing

作者： Yokota, M Capi, G Fukuoka Inst Technol Dept Syst Management Fac Informat Engn Higashi Ku Fukuoka 8110295 Japan

ISBN: (纸本)3540308032

An ideal ubiquitous computing environment can be a network system of such intelligent and human-friendly robots that never appear in front of humans except when needed. In this paper the distributed intelligent robot network (DIRN) is proposed as one kind of wireless sensor and actor networks (WSAN) consisting of one brain node and numerous sensor and actor nodes with human-friendly interfaces. In order to realize well-coordinated DIRNs, it is very important to develop a systematically computable knowledge representation language universal for any kind of device as well as efficient networking technologies. As a candidate for this purpose, the multimedia description language L-md was evaluated by applying it to simulation of DIRN-world interaction.

关键词： multimedia systems

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Improving quality of service for streaming multimedia applications in ubiquitous mobile environment 43

Improving quality of service for streaming multimedia applic...

引用

43rd Annual Association for computing Machinery Southeast conference, ACMSE '05

作者： Jain, Radhika Department of Computer Information Systems Georgia State University Atlanta 30302 United States

ISBN: (纸本)1595930590

Despite the great potential demonstrated by the multimedia-rich data in various business applications, none of the prior research has addressed the design of high-quality access to the multimedia content in heterogeneous wireless networking environment. In this research, we have presented a partial pre-retrieval and buffering scheme to improve various quality of service (QoS) parameters for multimedia content for in such context. Specifically it addresses the three important QoS parameters namely delay, delay variation, and information loss that directly impact the mobile user's quality of experience indicators. Here we have also presented the analysis of the buffering requirements and the related issues for high-quality access to the multimedia content in such environment. Results of this research have potential to improve the understanding of these multimedia QoS parameters for ubiquitous wireless infrastructures. Copyright 2005 ACM.

关键词： Quality of service

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Low complexity adaptive MIMO-OFDM system for transmission under correlated frequency-selective channels

Low complexity adaptive MIMO-OFDM system for transmission un...

引用

International conference on Wireless Communications, networking and Mobile computing

作者： Halmi, H Azlida, IS Desa, SM Noh, ZM Hafiza, WH Diyana, WM Multimedia Univ Cyberjaya 63100 Selangor Malaysia

ISBN: (纸本)078039335X

Existing works on MIMO systems have been restricted to either uncorrelated frequency-selective channels or correlated non frequency-selective channels. Practical MIMO systems however, suffers from the effects of frequency selectivity and channel correlation due to the high transmission rate and proximity of the transmit antennas. This paper presents a low complexity adaptive MIMO-OFDM system. The system exploits the time, frequency and spatial dimensions to provide high data rate and robust signal transmission in frequency selective channels with varying correlation levels. Compared to existing MIMO-OFDM systems, the proposed system provides up to 2-3 dB gains under low channel correlations and more than 5 dB gains in highly correlated channel.

关键词： adaptive loading multiple-input multiple output (MIMO) orthogonal frequency division multiplecing (OFDM) space-time coding (STC) spatial multiplexing (SM)

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Monitoring of cache miss rates for accurate dynamic voltage and frequency scaling

Monitoring of cache miss rates for accurate dynamic voltage ...

引用

conference on multimedia computing and networking 2005

作者： Singleton, L Poellabauer, C Schwan, K Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0819456535

Modem mobile processors offer dynamic voltage and frequency scaling, which can be used to reduce the energy requirements of embedded and real-time applications by exploiting idle CPU resources, while still maintaining all applications' real-time characteristics. However, accurate predictions of task run-times are key to computing the frequencies and voltages that ensure that all tasks' real-time constraints are met. Past work has used feedback-based approaches, where applications' past CPU utilizations are used to predict future CPU requirements. Inaccurate predictions in these approaches can lead to missed deadlines, less than expected energy savings, or large overheads due to frequent voltage and frequency changes. Previous solutions ignore other 'indicators' of future CPU requirements, such as the frequency of I/O operations, memory accesses, or interrupts. This paper addresses this shortcoming for memory-intensive applications, where measured task run-times and cache miss rates are used as feedback for accurate run-time predictions. Cache miss rates indicate the frequency of memory accesses and enable us to derive the latencies introduced by these operations. The results shown in this paper indicate improvements in the number of deadlines met and the amount of energy saved.

关键词： Clocks Feedback loops Algorithms Image compression Data processing Matrices multimedia Switching Computer engineering Computer science

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A context-sensitive incremental learning paradigm of an ubiquitous multimodal multimedia computing system

A context-sensitive incremental learning paradigm of an ubiq...

引用

2005 IEEE International conference on Wireless and Mobile computing, networking and Communications, WiMob'2005

作者： Hina, Manolo Dulva Ramdane-Cherif, Amar TadI, Chakib Electrical Engineering Department Université du Québec École de Technologie Supérieure 1100 rue Notre-Dame Ouest Montréal Qué. H3C 1K3 Canada Prism Laboratory CNRS Université de Versailles - St. Quentin-en-Yvelines 45 avenue des États-Unis 78035 Versailles Cedex France

ISBN: (纸本)0780391829

In this paper, we proposed a context-sensitive incremental learning paradigm of an ubiquitous multimodal multimedia computing system. An ubiquitous computing environment supports a busy and mobile user's need of being able to work on his task anytime and anywhere he wants. Along with user's data (his profile, task, and application registry) the machine-acquired intelligence needs to be transported as well in order that the user could continue working on an intelligent environment. Machine intelligence is acquired through incremental learning. In a context-sensitive environment that has a rich selection of modalities and media for data input and output, an intelligent computing system could determine the I/O devices appropriate for the user's setting after considering the user's location, the noise level in the environment, and the presence or absence of other people in the vicinity. Every new setting (pre-condition scenario) produces a new I/O devices configuration (post-condition scenario) suited for the setting;each new scenario knowledge gets stored onto knowledge database. Overtime, the machine would have enough knowledge to deal with whatever context scenario that comes up. © 2005 IEEE.

关键词： multimedia systems

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Loopback: Exploiting collaborative caches for large-scale streaming

Loopback: Exploiting collaborative caches for large-scale st...

引用

conference on multimedia computing and networking 2005

作者： Kusmierek, E Dong, YF Du, D Poznan Supercomp & Networking Ctr PL-61704 Poznan Poland

ISBN: (纸本)0819456535

In this paper, we propose a novel loopback approach in a two-level streaming architecture to exploit collaborative client/proxy buffers for improving the quality and efficiency of large-scale streaming applications. At the upper level we use an overlay to deliver video from a central server to proxy servers, at the lower level a proxy server delivers video with the help of collaborative caches. In particular,a proxy server and its clients in a local domain cache different portions of a video and form delivery loops. In each loop, a single video stream originates at the proxy, passes through a number of clients, and is passed back to the proxy. As a result, with limited bandwidth and storage space contributed by collaborative clients, we are able to significantly reduce the requirements of network bandwidth, I/O bandwidth, and cache space at a proxy. Furthermore, we develop local repair schemes to address the client failure issues for enhancing server quality and eliminating most repairing load at servers. For popular videos, our local repair schemes are able to handle most of single-client failures without service disruption and retransmissions from a central server. Our analysis and simulations have shown the efficacy of loopback in various settings.

关键词： video streaming proxy server collaborative caches

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An improvement fast INTER mode selection for H.264 joint with spatio-temporal correlation

An improvement fast INTER mode selection for H.264 joint wit...

引用

2005 International conference on Wireless Communications, networking and Mobile computing, WCNM 2005

作者： Yin, Ming Wang, Hong-Yuan Department of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)078039335X

Considering the much computational complexity of selecting inter macroblock coding mode for H.264, an improved fast mode decision is proposed in this paper by exploiting the features in spatio-temporal domain. Simulations show that the proposed algorithm reduces the encoding time by 89.94% on average without consideration performance degradation. © 2005 IEEE.

关键词： multimedia systems

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A bandwidth allocation framework for adaptive multimedia traffic with time adaptability in wireless and mobile networks

A bandwidth allocation framework for adaptive multimedia tra...

引用

2005 International conference on Pervasive Systems and computing, PSC'05

作者： Chanda, Pritam Xu, Yong Qing-Zeng, An Wireless and Mobile Networking Laboratory Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)9781932415520

Next generation wireless networks are expected to support multi-class variable bandwidth realtime multimedia applications. High user mobility and inherent instability of wireless channels makes quality of service (QoS) provisioning a challenging issue in wireless networks. In this paper, we propose a novel resource management scheme for QoS provisioning in wireless networks for multimedia calls. We improve handoff call dropping probabilities and reduce bandwidth fluctuations a call suffers by making the call time adaptable to bandwidth changes. Simulation results show that our scheme maintains low handoff call dropping probabilities and significantly reduces bandwidth variations at the end hosts.

关键词： Wireless networks

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Embedded video surveillance system for vehicle over WLAN and CDMA1X

Embedded video surveillance system for vehicle over WLAN and...

引用

International conference on Wireless Communications, networking and Mobile computing

作者： Li, M Hu, RM Gao, G Li, W Wang, ZY Wuhan Univ Key Lab Multimedia & Network Commun Engn Wuhan 430072 Peoples R China

ISBN: (纸本)078039335X

With the recent advancement of mobile wireless technologies such as: wireless LAN and CDMA, it has become viable to create a network-in-motion inside a Vehicle. This paper presents an Embedded Video Surveillance System for vehicle over WLAN and CDMA1X First, it constructs high speed automobile communication environment by fusing CDMA1X and WLAN wireless network;In order to fit the bandwidths sharply variety of wireless channel, adaptive video compression algorithms based MPEG4 is utilized to encode the high quality video. Moreover, unique transmission mechanism using media server and media gateway is presented, which can support large scale concurrent users up to 1000. This transmission mechanism uses the buffer on media server to smooth the video transport in wireless channel. Using this architecture of video transmission for Vehicle, the live surveillance video of mobile can be viewed over internet. Furthermore, Control center can be set up anywhere with internet access without being restricted by monitored site locations. This system is supported by Electronic Information Industry Development Fund of 2004.

关键词： video surveillance vehicle WLAN CDMA

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CarpetLAN: A novel indoor wireless(-like) networking and positioning system 05

CarpetLAN: A novel indoor wireless(-like) networking and pos...

引用

7th International conference on Ubiquitous computing

作者： Fukumoto, M Shinagawa, M NTT Corp DoCoMo Multimedia Labs Yokosuka Kanagawa 2398536 Japan NTT Corp Microsyst Integrat Labs Atsugi Kanagawa 2430198 Japan

ISBN: (纸本)3540287604

CarpetLAN is a novel indoor wireless(-like) broad-band networking and positioning system. It uses the floor surface and the human body as an Ethernet-cable, and weak electric fields as the transmission media. Portable and wearable devices can connect to the network while the user stands or walks on the floor;connection speed is 10Mbps. Home and office appliances can also access the network if they are just put on the floor. CarpetLAN also provides an indoor positioning function, which is urgently needed for realizing "ubiquitous" communication. This electric field based transmission system yields ultra-micro communication cells, so the positions of humans and appliances can be detected with about I meter accuracy.

关键词： Wireless telecommunication systems

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