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On scheduling video streaming data in the HDR system

On scheduling video streaming data in the HDR system

引用

IEEE Conference on Vehicular technology (VTC)

作者： K. Gribanova R. Jantti Control Engineering Laboratory Helsinki University of Technology Finland Department of Computer Science University of Vaasa Vaasa Finland

In this paper, we propose a scheduling scheme for video streaming services in a high data rate (HDR) downlink. It is applicable to CDMA2000 one-carrier evolution data only (1/spl times/EV-DO) based on HDR technology, and can be adopted in high speed downlink packet access (HSDPA) for UMTS. We consider the problem of improving the performance of existing real-time data channel-adaptive scheduling schemes. The modified-largest-weighted-delay-first (M-LWDF) and exponential (EXP) rules were shown to achieve good results in in terms of head-of-line (HOL) packet delays not exceeding given thresholds. To adapt the rules we suggest modifying them by taking into account the impact of the video playout buffer. The objective of our scheduling scheme is to reduce the percentage of video frames which do not meet their playback deadlines and to provide fairness among the users. To take into account the specific nature of video streaming applications, we applied the 2nd-order autoregressive process model for the MPEG video stream. The simulation results suggest that the modified M-LWDF and EXP rules surpass the conventional ones.

关键词： Streaming media Delay Downlink Quality of service Base stations Processor scheduling Multiaccess communication Jitter Throughput Time division multiplexing

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Multiple-contact representation for the real-time volume haptic rendering of a non-rigid object

Multiple-contact representation for the real-time volume hap...

引用

International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (HAPTICS)

作者： Sang-Youn Kim Jinah Park Dong-Soo Kwon Telerobotics & Control Laboratory Department of Mechanical Engineering Korea Advanced Institute of Science and Technology South Korea Computer Graphics & Visualization Laboratory School of Engineering ICU South Korea

ISBN: (纸本)0769521126

This paper presents a fast haptic rendering method providing the sense of touch from a virtual volumetric non-rigid object when a human operator interacts with the object at multiple points. Previously, we have proposed a fast volume haptic rendering method based on the shape-retaining chain linked model (or the S-chain model) that can handle the deformation of a volumetric non-rigid object and its haptic feedback in real time. One of the key differences between the S-chain model and a traditional FEM or mass-spring model is that the computation of the deformation and its reflected force is performed at a local level. When there are more than one interaction points with the object, it is necessary to consider a modeling framework that can handle human operator's all inputs together. In this paper, we propose a modeling framework in which forces generated at interaction points are vectorially summed to deal with the multiple contact points. Our experiments demonstrate that our proposed method is suitable for the real-time volume haptic rendering of a volumetric non-rigid object with multiple-contact points.

关键词： Haptic interfaces Humans Rendering (computer graphics) Computational modeling Deformable models Minimally invasive surgery Laboratories Feedback Telerobotics Mechanical engineering

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Experimental evaluation of a new repetitive control algorithm on a non-minimum phase spring-mass-damper system

Experimental evaluation of a new repetitive control algorith...

引用

2004 IFAC Workshop on Adaptation and Learning in control and Signal Processing, ALCOSP 2004 and IFAC Workshop on Periodic control Systems, PSYCO 2004

作者： Freeman, C.T. Hätönen, J.J. Lewin, P.L. Owens, D.H. Rogers, E. School of Electronics and Computer Science University of Southampton University Road SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Systems Engineering Laboratory University of Oulu University of Oulu P.O. BOX 4300 FIN-90014 Finland

Recently, a novel optimality based Repetitive control algorithm was proposed in (Hätönen et al., 2003). According to the convergence analysis carried out in that paper, the algorithm will result in asymptotic convergence for an arbitrary discrete-time LTI plant and a T -periodic reference. However, the performance of the algorithm was tested only using simulation studies. In order to rigorously test how the algorithm performs with real systems, in this paper the algorithm is implemented on a non-minimum phase spring-mass-damper system. The results are very satisfactory, because the algorithm results in near perfect tracking with this rather demanding plant type. Copyright © 2004 IFAC.

关键词： Non-Minimum Phase Systems Optimal control Polynomial Systems Theory Repetitive control

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Practical implementation of a model inverse iterative learning controller

Practical implementation of a model inverse iterative learni...

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2004 IFAC Workshop on Adaptation and Learning in control and Signal Processing, ALCOSP 2004 and IFAC Workshop on Periodic control Systems, PSYCO 2004

作者： Ratcliffe, J.D. Harte, T.J. Hätönen, J.J. Lewin, P.L. Rogers, E. Owens, D.H. School of Electronics and Computer Science University of Southampton University Road SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Systems Engineering Laboratory University of Oulu University of Oulu P.O. BOX 4300 FIN-90014 Finland

In this paper, a new model inverse optimal iterative learning control algorithm is practically implemented on an industrial gantry robot. The algorithm has only one tuning parameter which can be adjusted to provide a balance between convergence speed and robustness. Results show that the algorithm is capable of learning the required trajectory in very few iterations. However at this convergence rate the lack of robustness is a major issue. Appropriate use of the tuning parameter is shown to greatly increase the algorithm robustness as demonstrated by tests which successfully reach 600 iterations. Copyright c 2004 IFAC. Copyright © 2004 IFAC

关键词： Iterative methods

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Towards real-time obstacle detection using a hierarchical decomposition methodology for stereo matching with a genetic algorithm

Towards real-time obstacle detection using a hierarchical de...

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Y. Ruichek H. Issa J.G. Postaire J.C. Burie Systems and Transportation Laboratory University of Technology of Belfort-Montbéliard Belfort France Control Computer Engineering and Signal Laboratory University of Science and Technology of Lille Villeneuve d'Ascq France Computer Science Image and Interaction Laboratory University of La Rochelle La Rochelle France

This work is concerned with the stereo matching problem for real-time obstacle detection. The correspondence problem is viewed as an optimization task where the objective is to find a solution for which the matches are as compatible as possible with respect to specific constraints. The optimization process is performed by means of a genetic algorithm with a new encoding scheme. For an effective exploitation of the genetic algorithm for real-time obstacle detection, a multilevel searching strategy is proposed in order to speed-up the stereo matching process. The multilevel searching strategy consists of matching the edges at different levels by considering their gradient magnitudes. The performance of the proposed multilevel genetic stereo matching procedure is evaluated for real-time obstacle detection in front of a moving vehicle using linear stereo vision.

关键词： Genetic algorithms Stereo vision Layout Cameras Laboratories Vehicle detection Vehicles Data mining computer vision Feature extraction

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Using invisible watermarks to protect visibly watermarked images

Using invisible watermarks to protect visibly watermarked im...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Yongjian Hu S. Kwong Jiwu Huang School of Information Science and Technology Sun Yat-Sen University Guangzhou China Department of Computer Science City University of Hong Kong Kowloon Hong Kong China Department of Automatic Control Engineering South China University of Technology Guangzhou China

Physical visible watermarks have been widely used for centuries. Now digital visible watermarks such as electronic logos find their applications in digital library, video broadcasting, and other multimedia services. Several visible watermarking techniques have been proposed in the literature, and meanwhile, some problems with visible watermarks are also under investigation. Among these problems, watermark removal and unauthorized insertion are two major concerns. We propose using an invisible watermark in visibly watermarked images to overcome these problems. When a visibly watermarked image is in question, the invisible watermark can provide appropriate ownership information. We first investigate what kind of invisible watermark is needed, and then, focus on the details of the invisible watermarking technique. The experiments have shown that the proposed algorithm can provide a very effective protection for visibly watermarked images.

关键词： Watermarking Protection Discrete wavelet transforms Partial response channels automatic control computer science Cities and towns Application software Software libraries Multimedia communication

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Distributed removal algorithms for multi-rate CDMA cellular communication systems

Distributed removal algorithms for multi-rate CDMA cellular ...

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IEEE Conference on Vehicular technology (VTC)

作者： M. Elmusrati R. Jantti H. Koivo Control Engineering Laboratory Helsinki University of Technology Finland Electrical & Electronic Department Garyounis University Libya Telecommunications group Department of Computer Science University of Vaasa Finland

We study the problem of removing users from congested cells. We consider two different objectives for the removal algorithms. The first objective is to maximize the throughput. The second objective is to minimize the number of removed connections. The optimal removing problem can be classified as a combinatorial optimization problem. It is well known that there is no general closed form solution for this type of problem. Furthermore, finding the optimal solutions in medium and large sizes of these problems is usually very exhausting. Consequently, we use heuristics to solve the problem. Our proposed heuristic algorithm is very simple to implement and gives a solution close to the optimum in many different cases.

关键词： Multiaccess communication Throughput Heuristic algorithms Interference Closed-form solution Data communication Admission control Radio spectrum management Resource management Waste materials

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Robustness of dual-rate inferential MPC systems

Robustness of dual-rate inferential MPC systems

引用

American control Conference (ACC)

作者： J.A. Rossiter J. Sheng T. Chen S.L. Shah Department of Automatic Control & Systems Engineering Sheffield University Sheffield UK Coordinated Science Laboratory University of Illinois Urbana USA Department of Electrical & Computer Engineering University of Alberta Edmonton AB Canada Department of Chemical & Materials Engineering University of Alberta Edmonton AB Canada

This paper investigates the robustness of dual-rate MPC systems with a proposed inferential control strategy. It shows that for some scenarios where a high-frequency model plant mismatch is presented, such dual-rate i... 详细信息

关键词： Robustness Robust stability Predictive models Robust control control systems Predictive control Strontium control system analysis Integrated circuit modeling Time varying systems

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An efficient algorithm and implementation for residue to binary number conversion

An efficient algorithm and implementation for residue to bin...

引用

International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Chengyi Xiong Zhirong Gao Jinwen Tian Key Laboratory of Education Commission for Image Processing and Intelligent Control Institute of Pattern Recognition & Artificial Intelligence Huazhong University of Science and Technology Wuhan China Department of Computer Science Wuhan University of Science & Engineering Wuhan China Key Laboratory of Education Commission for Image Processing Huazhong University of Science & Technology China

The residue number system (RNS) has computational advantages in addition and multiplication compared with weighted number systems, such as the binary number system (BNS), since operations on residue digits are performed independently and these processes can be performed in parallel. Thus they are widely used in digital signal processing etc. Since residue to binary conversion is critical and difficult for the practicality of RNS, in this paper, a novel residue to binary (R/B) conversion algorithm for the restricted moduli set (2/sup n/ -1, 2/sup n/, 2n+1), based on exploring the periodicity of modulo (2/sup n/ /spl plusmn/ 1) operations is presented. A new 2n-bit adder based R/B converter is also proposed. The performance comparison results demonstrate that the new converter is faster and requires less area compared with the others reported in the previous literature.

关键词： Signal processing algorithms Image converters Educational institutions computer science Concurrent computing Digital signal processing Arithmetic Laboratories Image processing Intelligent control

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Optimizing the structure of hierarchical mixture of experts using genetic algorithms

Optimizing the structure of hierarchical mixture of experts ...

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International IEEE Conference on Intelligent Systems, IS

作者： D.A. Karras C.E. Vlitakis Y.S. Boutalis B.G. Mertzios Chalkis Institute of Technology Department Automation and Hellenic Open University Athens Greece Department Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Department of Automation Thessdoniki Institute of Technology Laboratory of Automatic Control Systems Thessaloniki Hellas and Democritus University Xanthi Greece

This study is an effort to give a practical solution in the problem of optimizing the structure of the hierarchical mixture of experts model, which is a natural extension of the associative Gaussian mixture of experts system. We present two novel methods for optimizing such structures using genetic algorithms. Special concern is taken for reducing the computational time so as to efficiently allow the structure to "grow" while it evolves with the genetic algorithm. The main contribution of the paper lies on the efficient, topologically oriented, representations of such architectures so as to be optimized through involving genetic algorithms.

关键词： Genetic algorithms Biological cells Optimization methods Neural networks Classification tree analysis Automation Decision trees Expert systems computer architecture Supervised learning

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