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2012 IEEE 8th International conference on Wireless and Mobile computing, networking and Communications, WiMob 2012

作者： Chung, Joaquin González, Grace Armuelles, Ivan Robles, Tomás Alcarria, Ramon Morales, Augusto University of Panama Panama Panama Madrid Spain

ISBN: (纸本)9781467314305

Wireless mesh networks (WMNs) are next generation networks that have emerged as a promising technology capable of providing broadband connectivity at low cost, and offers advantages in scenarios where cabling is too expensive or prohibitive. Rural communities are a good example of these kind of scenarios. Deployment of WMNs in rural communities can be done with a low budget, and expansion of the network can be done as the community grows. In this paper we evaluate the performance of a small scale wireless mesh network, comparing two well known routing protocols for WMNs, B.A.T.M.A.N. Advanced and the 802.11s standard, against an OpenFlow controller. Then, by deploying a testbed we verify their bandwidth, datagram loss and jitter. Finally, our results show that both routing protocols have advantages and disadvantages. Besides, the OpenFlow approach shows an acceptable performance compared to the routing protocols;however, some adjustments are needed to optimize the performance of OpenFlow in WMNs. Our contribution in this paper is the characterization of the multimedia service capacity of wireless mesh networks for rural communities. © 2012 IEEE.

关键词： Routing protocols

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Energy efficiency in large-scale distributed systems

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FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF GRID computing AND ESCIENCE 2012年第5期28卷 743-744页

作者： Tuan Anh Trinh Hlavacs, Helmut Talia, Domenico Budapest Univ Technol & Econ Network Econ Grp H-1117 Budapest Hungary IBM Corp Armonk NY USA Univ Vienna Inst Distributed & Multimedia Comp A-1010 Vienna Austria Univ Vienna Res Grp Entertainment Comp Fac Comp Sci A-1010 Vienna Austria Univ Calabria Fac Engn I-87030 Commenda Di Rende Italy Italian Natl Res Council ICAR CNR Inst High Performance Comp & Networks Rome Italy

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Spatial enhancement of DEM using perspective non-Lambertian SFS from multi-spectral image

Spatial enhancement of DEM using perspective non-Lambertian ...

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8th International conference on Wireless Communications, networking and Mobile computing (WiCOM)

作者： Gong, Hu Shi, Qiang Wuhan Univ Natl Engn Res Ctr Multimedia Software Wuhan 430072 Peoples R China State Key Lab Informat Engn Survering Mapping & R Wuhan Peoples R China

ISBN: (纸本)9781612846835;9781612846828

Numerous geosciences applications need denser and more accurate Digital Elevation Model data. Photogrammetry, as the main method of producing DEM, sometimes loses its feasibility in the textureless area or in the case where no aerial photography with highly spatial resolution is available. Under this circumstance, interpolation methods are often utilized to generate denser DEM map. However, these methods are mathematical processes which only consider known points and neglect the ground truth of unknown surface. To correctly reconstruct the surface of terrain from sparse ground control points, this paper presents a new DEM densification algorithm, combining perspective non-Lambertian SFS based on spectral information from single satellite image with DEM interpolation. Single multi-spectral image was used to correctly estimate surface reflection properties at first, and surface relative shape was reconstructed based on Oren-Nayar reflection model. Finally the shape from gradient interpolation method was applied to generate a higher-resolution DEM grid. Experiments demonstrate the ability of the proposed algorithm for the enhanced resolution DEM map from the sparse DEM grid and multi-spectral image.

关键词： component DEM densification shape from shading perspective non-Lambertian model heterogeneous area interpolation

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An Objective Quality Assessment of multimedia Service Based on Cross-layer Optimal Mapping

An Objective Quality Assessment of Multimedia Service Based ...

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8th International conference on Wireless Communications, networking and Mobile computing (WiCOM)

作者： Jiang, Lisi Zeng, Juling Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100088 Peoples R China Three Gorges Univ Coll Comp & Commun Technol Yichang Peoples R China

ISBN: (纸本)9781612846835;9781612846828

In order to provide the end-to-end service with QoS support, a novel objective quality assessment adopting the cross-layer optimized mapping from the key components' value of application layer to the subjective score of user-layer is presented in this paper. In this framework, the maximum likelihood estimation to the subjective score in subjective quality assessment with lower complexity is presented at first to avoid the complexity of the least-squares estimation. Then the optimal selection of the key component based on the highest loading is obtained, which take out the correlation among the application-layer parameters and simple the mapping form the key component to the application-layer equipment. At last, an optimal multiple regression line mapping based on the maximum likelihood decision is presented, which utilize the statistical quantifying outcomes of the subject score and adjust the coefficient of the mapping according to the fluctuation of those outcomes. This optimal mapping avoid the un-accuracy resulted from the ignorance of the statistics of the subjective score in the liner dynamic curve fitting. The objective quality assessment in this paper is facile to online monitor by the subject score or quality assess based on network scene. The computation and the simulation show that our suggestion outperforms the old one.

关键词： objective quality assessment maximum likelihood estimation multiple regression analysis maximum likelihood decision comparative judgment and interval scale

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Spatial parameter choosing method based on spatial perception entropy judgement

Spatial parameter choosing method based on spatial perceptio...

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2012 8th International conference on Wireless Communications, networking and Mobile computing, WiCOM 2012

作者： Sheng, Cao Ruimin, Hu Yuxing, Peng National Engineering Research Center for Multimedia Software Wuhan University Wuhan China National University of Defense Technology Changsha China Hubei Telecom Billing Center Wuhan China

ISBN: (纸本)9781612846835

With stereo audio steping into people's daily lives, spatial parametric technology comes to its broad prospects for development. Spatial parameteric technology is a method for stereo compression. This paper proposes a spatial parameter selection method based on spatial perception entropy judgment. And it gives a new Spatial Perception Entropy method and principle, and build the SPE codec framework in MDCT-domain, improving quality and reducing complexity in the spatial audio information. The method can optimize spatial parameter selection and realize high-efficiency spatial audio codec. © 2012 IEEE.

关键词： Audio signal processing

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Workload Characteristics-aware Virtual Machine Consolidation Algorithms

Workload Characteristics-aware Virtual Machine Consolidation...

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4th IEEE International conference on Cloud computing Technology and Science (CloudCom)

作者： Yang, Jyun-Shiung Liu, Pangfeng Wu, Jan-Jan Natl Taiwan Univ Grad Inst Networking & Multimedia Taipei 10764 Taiwan Natl Taiwan Univ Grad Inst Networking & Multimedia Dept Comp Sci & Informat Engn Taipei 10764 Taiwan Acad Sinica Res Ctr Informat Technol Innovat Inst Informat Sci Taipei Taiwan

ISBN: (纸本)9781467345101;9781467345118

An energy conservation strategy must address two issues placement of virtual machine images and workload characteristics of virtual machines. For performance reason most cloud systems copy a prototype image into the local disk of a physical machine before starting a virtual machine. If the physical machine that stores the image of a virtual machine is off-line, then we cannot run this virtual machine. The workload characteristics of virtual machines determine whether it is data-intensive or CPU-intensive. We assume that the system has a distributed file system therefore a physical machine can run any virtual machine even lilt does not have the image. However, we observe that the performance of a data-intensive virtual machine running on a physical machine without its image could result in 60% performance loss compared with running the same virtual machine on a physical machine that has the virtual machine image. On the other hand, the performance of a CPU-intensive virtual machine is almost independent of whether the physical machine has the image or not. As a result, an energy conservation algorithm must consider the workload characteristic of a virtual machine when finding a physical machine to run it, especially for data-intensive virtual machines. This paper proposes a workload characteristics-aware virtual machine consolidation algorithms. We propose an approximation algorithm and two dynamic programmings to consolidate virtual machines and reduce the number of physical machines. We conduct experiments and compare the numbers of physical machines used by our approximation algorithm with the optimal number of physical machines found by our dynamic programming. The experiment results indicate that our approximation algorithm finds good solutions much faster than the dynamic programming.

关键词： Cloud computing Energy Conservation Virtual Machine Consolidation

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Towards QoE-driven multimedia service negotiation and path optimization with software defined networking

Towards QoE-driven multimedia service negotiation and path o...

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2012 20th International conference on Software, Telecommunications and Computer Networks, SoftCOM 2012

作者： Kassler, Andreas Skorin-Kapov, Lea Dobrijevic, Ognjen Matijasevic, Maja Dely, Peter Karlstad University Computer Science Dept. Universitetsgatan 2 65188 Karlstad Sweden University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 10000 Zagreb Croatia

ISBN: (纸本)9789532900347

This paper presents motivation and ongoing work towards a system for Quality of Experience (QoE)-driven path assignment for multimedia services. The system goal is to enable negotiation of service and network communication parameters between end-users and to assign the network paths that are used for delivering multimedia flows according to the agreed service configuration. The key concept behind the system is a centralized multi-user optimization of the path assignments, which maximizes QoE by taking into account service utility functions, network topology, link capacities, and delay. Based on the output of the optimization process, the system implementation uses the OpenFlow to set up forwarding paths for the network elements. © 2012 University of Split.

关键词： Software defined networking

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Detecting SIP flooding attacks on IP multimedia Subsystem (IMS)

Detecting SIP flooding attacks on IP Multimedia Subsystem (I...

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2012 International conference on computing, networking and Communications, ICNC'12

作者： Chen, Zhiqiang Wen, Wushao Yu, Da School of Software Sun Yat-Sen University Guangzhou Guangdong 510006 China

ISBN: (纸本)9781467300094

multimedia Subsystem (IMS) is an IP-based network architecture. IMS uses IETF-defined protocols, such as SIP, TCP, and UDP etc. to realize next generation mobile service. These protocols have been facing many different kinds of security threats, which make IMS vulnerable. However, the security mechanism defined in IMS only includes limited features such as authentication and encryption. Since methods of attacks to IMS are various, these features are not sufficient. The Session Initiation Protocol (SIP) is used in IMS to establish and manage sessions. It is easy for a hacker to attack IMS with flooding SIP messages. However, IMS does not provide any functions to prevent such kind of attacks. In this paper, we focus on the Denial of Service (DoS) flooding attack using SIP messages in IMS, and provide a detecting approach using the non-parametric cumulative sum (CUSUM) algorithm that can effectively detect such kind of DoS attacks. © 2012 IEEE.

关键词： Denial-of-service attack

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Hybrid Adaptive Fuzzy Time Series Model to Forecast TAIEX

Hybrid Adaptive Fuzzy Time Series Model to Forecast TAIEX

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8th International conference on computing and networking Technology (ICCNT)

作者： Choua, Peng Szu Liu, Jing-Wei Cheng, Ching-Hsue Taipei Coll Maritime Technol Dept Multimedia & Game Sci Taipei Taiwan Natl Yunlin Univ Sci & Technol Dept Informat Management Touliu 640 Yunlin Taiwan

ISBN: (纸本)9781467313261

Over the past few years, fuzzy time series model has been widely researched. However, previous studies have a problem that determines subjectively the length of intervals. Furthermore, the consideration of a forecasting stage only discusses the relations for previous period and next period. This paper propose a promising hybrid model to get more efficient forecasting. Hence, this study proposes a fusion model, which incorporates a granular spread partition method and the adaptive expectation method to enhance the forecasting results. To verify the proposed model, a ten-year period of the TAIEX (Taiwan Stock Exchange Capitalization Weighted Stock Index) are employed as experimental datasets. From the experiment results, the performances of proposed integrated model surpass the listing models.

关键词： Fuzzy time series Fuzzy logical relationship (FLR) Forecasting

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FRAGMENT REDUCTION ON MOBILE GPU WITH CONTENT ADAPTIVE SAMPLING

FRAGMENT REDUCTION ON MOBILE GPU WITH CONTENT ADAPTIVE SAMPL...

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IEEE International conference on multimedia and Expo Workshops (ICMEW)

作者： Chang, Chia-Yang Chen, Yu-Jung Chang, Chia-Ming Chien, Shao-Yi Natl Taiwan Univ Grad Inst Elect Engn Dept Elect Engn Taipei Taiwan Natl Taiwan Univ Grad Inst Networking & Multimedia Taipei Taiwan

ISBN: (纸本)9780769547299

Fragment shaders in a graphics pipeline are used to compute the color for each pixel, where lighting, texture loading, and other calculations are involved. The required computing power is proportional to the number of input fragments. In order to improve the power efficiency of mobile GPUs, a content adaptive sampling scheme is proposed to reduce the fragments. The proposed scheme is based on tile-based traversal. For each 4x4 tile, only parts of the fragments are sampled and rendered with the original shader program, and the values of other fragments are interpolated from these rendered fragments if the content checking condition can be passed. With this approach, the sampling patterns are decided adaptively, where more samples are employed for complex regions to avoid quality degradation. Experimental results show that about 30% - 50% fragments can be reduced where high image quality can be still maintained. The proposed scheme can be employed to reduce the power consumption and increase the frame rate for mobile GPUs.

关键词： Mobile Graphics Graphics Rendering Mobile Graphics Hardware GPU

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