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8th IEEE International Symposium on Intelligent Systems and Informatics, SIISY 2010

作者： Galambos, Péter Baranyi, Péter Korondi, Péter Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Department of Manufacturing Science and Technology Budapest University of Technology and Economics Hungary Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Hungary Department of Mechatronics Optics and Information Engineering Budapest University of Technology and Economics Hungary

ISBN: (纸本)9781424473946

Feedback delays are inherent attributes of distributed control systems that usually cause unfavorable effect on the stability of the controlled process. Modelling of such systems is essential for traceable controller synthesis. In this paper we apply the TP Model Transformation to derive a polytopic representation of an LPV model where the time-delay is considered as parameter. The method is introduced via a single degree of freedom impedance model with feedback delay. The resulted model is validated by simulation. ©2010 IEEE.

关键词： Distributed parameter control systems

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Cooperative MIMO transmission scheme for the DVB-T2 system

Cooperative MIMO transmission scheme for the DVB-T2 system

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2010 International Conference on information and Communication technology Convergence, ICTC 2010

作者： Ji, Soonbae Kim, Junghyun You, Cheolwoo Cho, Sunghyun Kim, Dongho Lee, Yehoon Department of Information and Communication Engineering Myong-Ji University Yongin Korea Republic of Department of Computer Science Gyeongsang National University Jinju Korea Republic of Department of Media Engineering and Electronic and Information Engineering Seoul National University of Science and Technology Seoul Korea Republic of

ISBN: (纸本)9781424498062

The Digital Video Broadcasting second generation Terrestrial (DVB-T2)standard purposes to provide high definition digital video and high rate services forthe same spectrum allocation of the current Digital Video Broadcasting Terrestrial (DVB-T)*** implementation guideline is provided by the DVB-T2standardization community,the Digital Video Broadcasting(DVB) *** DVB Project is requesting the many submission technologies which could be considered as candidates for asecond generation terrestrial transmission system. The most challenging requirements introduced by the DVB-T2 specification are an Fast Fourier Transform (FFT) size of up to 32k samples, 256-Quadrature amplitude modulation (QAM) and Low-Density Parity-Check (LDPC) coding with ablock size of 64k *** increasing concern in Multiple-Input Multiple-Output (MIMO) systems has given riseto numerous research activities in recent *** this paper,we propose the MIMO architecture and coded cooperative MIMO transmission scheme for DVB-T2 system. The simulation result of the proposal MIMO architecture in DVB-T2 system shows a definite performance improvement forcoded cooperative MIMO system. © 2010 IEEE.

关键词： Fast Fourier transforms

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Control design for impedance model with feedback delay

Control design for impedance model with feedback delay

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19th International Workshop on Robotics in Alpe-Adria-Danube Region, RAAD 2010

ISBN: (纸本)9781424468867

In haptic and telemanipulation devices stability and transparency are contradicting requirements. Due to the network delay the control process may become unstable. In our research we consider the coupled impedance type control algorithms for force reflecting telemanipulation. There are several solutions in the control literature to handle constant time delay in feedback systems, but varying delay is still a challenge. This paper attempt to handle varying delay by a novel approach. We propose a control structure where the system with feedback delay is approximated by a non-delayed model with modified time constants. The controller is designed according to this non-delayed substitute system and the control signal is computed using its observed state vector. Tensor Product (TP) Model Transformation is utilized to make a compact polytopic representation of the observer and controller for various time delays. In this method the actual value of the feedback delay is considered as an input parameter of the TP type controller and observer. As example, a single degree of freedom impedance model with feedback delay is discussed. The results are confirmed by numerical simulation. © 2010 IEEE.

关键词： Time delay

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An adaptive medium access control scheme for mobile ad hoc networks under self-similar traffic

An adaptive medium access control scheme for mobile ad hoc n...

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作者： Abu-Tair, Mamun Min, Geyong Ni, Qiang Liu, Hong Institute of Electronics Communications and Information Technology Queens University Belfast Belfast United Kingdom Department of Computing School of Computing Informatics and Media University of Bradford Bradford United Kingdom Electronic and Computer Engineering Division School of Engineering and Design Brunel University West London United Kingdom School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

An important function of wireless networks is to support mobile computing. Mobile Ad hoc NETworks (MANETs) consist of a collection of mobile stations communicating with each other without the use of any pre-existent infrastructure. The self-organization characteristic of MANETs makes them suitable for many real-world applications where network topology changes frequently. As a result, the development of efficient MAC (Medium Access Control) protocols in MANETs is extremely challenging. Self-similar traffic with scale-invariant burstiness can generate bursty network loads and thus seriously degrade the system performance. This paper presents an adaptive MAC scheme which dynamically adjusts the increasing function and resetting mechanism of contention window based on the status of network loads. The performance of this scheme is investigated in comparison with the legacy DCF (Distributed Coordination Function) under self-similar traffic and different mobility models. The performance results reveal that the proposed scheme is able to achieve the higher throughput and energy efficiency as well as lower end-to-end delay and packet drop probability than the legacy DCF. © 2009 Springer Science+Business media, LLC.

关键词： Medium access control

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Load distribution algorithm based on transcoding time estimation for distributed transcoding servers

Load distribution algorithm based on transcoding time estima...

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2010 International Conference in information Science and Applications, ICISA 2010

作者： Seo, Dongmahn Kim, Jongwoo Jung, Inbum Imaging Media Center Robotics/Systems Division Korea Institute of Science and Technology Seoul 136-791 Korea Republic of Department of Computer and Communications Engineering College of Information Technology Kangwon National University Chuncheon Gangwon 200-701 Korea Republic of

ISBN: (纸本)9781424459438

As a result of improvements in wireless communication technologies, a multimedia data streaming service can be provided for mobile clients such as PDAs and cellular phones. Because mobile devices have low computing power and work on a low network bandwidth, a transcoding technology is needed to adapt the original streaming media for mobile environments. To provide quality of service, original encoded media are transcoded within limited time and transmitted to clients without ceasing and jittering phenomena. In particular, when large-scale mobile clients demand streaming services, load distribution methods among distributed transcoding servers have a tremendous impact on the total number of quality of service streams. In this paper, a new load distribution method is proposed based on transcoding time estimation with transcoding servers' information, movie information and target transcoding bit-rate. In experiments, the proposed method produces the best performance scalability according to the increase of transcoding servers. ©2010 IEEE.

关键词： Quality of service

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Topic dependent class based language model evaluation on automatic speech recognition

Topic dependent class based language model evaluation on aut...

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IEEE Spoken Language technology Workshop

作者： Welly Naptali Masatoshi Tsuchiya Seiichi Nakagawa Department of Computer Science and Engineering Toyohashi University of Technology Japan Information and Media Center Toyohashi University of Technology Japan

A topic dependent class (TDC) language model (LM) is a topic-based LM that uses a semantic extraction method to reveal latent topic information from noun-document relation. Then a clustering for a given context is performed to define topics. Finally, a fixed window of word history is observed to decide the topic of the current event through voting in online manner. Previously, we have shown that TDC overperforms several state-of-the-art baselines in terms of perplexity. In this paper we evaluate TDC on automatic speech recognition experiment (ASR) for rescoring task. Experiments on read speech Wall Street Journal (English ASR system) and Mainichi Shimbun (Japanese ASR system) show that TDC LM improves both perplexity and word-error-rate (WER). The result shows that the proposed model gives improvements 3.0% relative on perplexity and 15.2% relative on WER for English ASR system, and 16.4% relative on perplexity and 24.3% relative on WER for Japanese ASR system.

关键词： Speech recognition Training Hidden Markov models History Vocabulary Semantics Speech

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A novel framework of fast and unambiguous link failure localization via monitoring trails

A novel framework of fast and unambiguous link failure local...

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IEEE Conference on computer Communications Workshops, INFOCOM 2010

作者： Wu, Bin Ho, Pin-Han Tapolcai, János Jiang, Xiaohong Department of Electrical and Computer Engineering University of Waterloo Waterloo ON N2L 3G1 Canada Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Budapest Hungary Department of Computer Science Graduate School of Information Science Tohoku University Aramaki Sendai 980-8579 Japan

ISBN: (纸本)9781424467396

The concept of monitoring trail (m-trail) has been proposed for achieving Fast and Unambiguous Link-failure Localization (FULL) in all-optical WDM (Wavelength Division Multiplexing) mesh networks. Previous studies on m-trails assumed the presence of alarm dissemination at each node such that a remote routing entity can collect the flooded alarm bits and form the alarm code to localize the failed link. This obviously leads to additional delay and extra control complexity in the electronic domain process. In this paper, we propose a novel framework based on m-trails for FULL, aiming at avoiding any possible alarm flooding and electronic domain mechanism such that each individual monitoring node (MN) can localize a single link failure according to locally available alarm bits. To save the supervisory wavelength-links, the proposed framework enables that the status of an m-trail can be monitored by multiple MNs along the m-trail by tapping the optical supervisory signal, rather than only by the destination node of the m-trail. An ILP (Integer Linear Program) is formulated and solved in a case study to verify the ILP and show the effectiveness of the proposed framework. We demonstrate that the status sharing among MNs of a common m-trail can effectively suppress the increase of supervisory wavelength-links as the number of MNs increases. ©2010 IEEE.

关键词： Wavelength division multiplexing

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A PCA and perturb based fragile watermarking scheme for 3d models

A PCA and perturb based fragile watermarking scheme for 3d m...

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作者： Wang, Jen-Tse Wang, Peng-Cheng Yu, Shyr-Shen Department of Computer Science and Engineering National Chung Hsing University 250 Kuo-Kuang Road Taichung 402 Taiwan Department of Digital Media Design Hsiuping Institute of Technology 11 Gungye Road Daily City Taichung 412 Taiwan Department of Information Management Hsiuping Institute of Technology 11 Gungye Road Daily City Taichung 412 Taiwan

In this paper, a new fragile watermarking scheme that enables the verification of 3D models for detecting unauthorized alterations is presented. The principal component analysis (PCA) is adopted to produce the PCA coordinate system and make the system robust to similarity transformation attacks. Before watermark embedding, the coordinates of illegitimate intervals are slightly perturbed to ensure all intervals legitimate, hi order to control distortion, a special quantization technique is proposed to watermark a legitimate interval. Experimental results show that 100% vertices of the cover model can be embedded and extracted in the proposed method. Moreover, the distortion of the stego model is insignificant and under controlled by quantization step setting. Finally, the proposed method is immune to the causality, convergence and embedding holes problems. ICIC International © 2010 ISSN 1349-4198.

关键词： Principal component analysis

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Collaborative video annotation by sharing tag clouds

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Transactions of the Japanese Society for Artificial Intelligence 2010年第2期25卷 243-251页

作者： Yamamoto, Daisuke Masuda, Tomoki Ohira, Shigeki Nagao, Katashi Department of Computer Science and Engineering Graduate School of Engineering Nagoya Institute of Technology Japan Graduate School of Information Science Nagoya Univeristy Japan Information Technology Center Nagoya Univeristy Japan Department of Media Science Graduate School of Information Science Nagoya Univeristy Japan

In this paper, we propose a video scene annotation method based on tag clouds. First, user comments associated with a video are collected from existing video sharing services. Next, a tag cloud is generated from these user comments. The tag cloud is displayed on the video window of the Web browser. When users click on a tag included in the tag cloud while watching the video, the tag gets associated with the time point of the video. Users can share the information on the tags that have already been clicked. We confirmed that the coverage of annotations generated by this method is higher than that of the existing methods, and users are motivated to add tags by sharing tag clouds. This method will contribute to advanced video applications.

关键词： Web services

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Beyond simulation: Student-built virtual reality games for cellular network design

Beyond simulation: Student-built virtual reality games for c...

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2010 ASEE Annual Conference and Exposition

作者： Jaurez, James Fu, Peilin Uhlig, Ronald Viswanathan, Shekar School of Media and Communication National University San Diego CA United States Department of Applied Engineering School of Engineering and Technology National University San Diego CA United States Department of Computer Science and Information Systems Lead Faculty Wireless Communications National University San Diego CA United States

This paper reports on experience with modifications to National University's "Wireless engineering Software" and "Radio Systems Modeling" courses to enable students to gain experience in wireless communications engineering through designing, building and then using simulation games for network design and radio design. Game design has been incorporated as a primary learning tool into these courses in the Master of Science in Wireless Communications degree program. Laboratory experiments and simulations are already used in some engineering curricula. The introduction of interactive simulation games in virtual environments goes a step further. The games simulate real world engineering dynamics and improve retention of complex concepts. Furthermore, the depth of learning increases as the students design and build the games, instead of just playing them. The processes and principles of game design have been adapted from National University's School of media and Communications (SOMC). SOMC currently uses this approach to successfully teach game design in its digital entertainment and interactive arts program, with the core objective of creating "playcentric" video games. To expand this process to engineering courses, faculty from SOMC and the School of engineering and technology (SOET), collaborated to combine engineering processes with game design techniques to teach interactive games for designing a cellular communications network and digital radio design to engineering students. Game rules, built by the students, must incorporate principles of mathematics, physics, and engineering, including the dynamics of wave propagation, binary logic, and the architecture of wireless systems. Students become game designers as they create original games including content from the STEM (Science, technology, engineering and Math) curriculum. This process makes students more effective system designers by bridging experience to the real world. Teams of students design and build the game

关键词： Students

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