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Metadata Management for Distributed Multimedia Storage system

Metadata Management for Distributed Multimedia Storage Syste...

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International Symposium on Electronic Commerce and Security

作者： Ling Zhan Jiguang Wan Peng Gu Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei China School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA

ISBN: (纸本)9780769532585

As a result of the multimedia rapid growth, there has been a huge increase in the amount of information generated and shared by people all over the world. Demand for large-scale multimedia storage system is growing rapidly. This paper describes the design and implementation of the Two-level metadata server for distributed multimedia storage system (DMSS). The DMSS divides the logical view of the stored data from the physical view. The logical view is managed by the metadata server which is called GMS (global metadata server), and the physical view is managed by a component of storage servers which is called LMS (local metadata server). Adopting LMS, each storage server can maintain its own storage resources and metadata and data independently, and can offer storage service independently. The DMSS allows the application servers to access the storage servers directly and in parallel providing very high performance.

关键词： Servers Multimedia communication Multimedia systems Least squares approximation system performance File systems Heart beat

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Interactive musical editing system to support human errors and offer personal preferences for an automatic piano - Method of searching for similar phrases with DP matching and inferring performance expression

Interactive musical editing system to support human errors a...

引用

作者： Chigoi, Yuichi Hayashi, Eiji Graduate School of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan Department of Mechanical Information Science and Technology Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9784990288020

We have developed a system that allows a piano to perform automatically. To get the piano to play music in the manner of a live pianist, we must add expression to the piano's performance. In the case of piano music, there are often 1000 or more notes in the score of even a short piece of music, and the automatic editor must spend a huge amount of time to accurately simulate the emotionally expressive performance of a highly skilled pianist. To shorten this editorial time, we have developed an interactive musical editing system to edit music more efficiently by utilizing a database. We have analyzed MIDI data regarding the performances of highly skilled pianists in order to observe the stylistic tendencies of their performances. We found that phrases having similar patterns in the same composition were performed in similar styles. Therefore, we developed a system that searches for similar phrases throughout the musical score and infers the style of their performance. Here, we propose a method using DP (Dynamic Programming) matching as a way to search for similar phrases and a method for inferring performance expression. ©ISAROB 2008.

关键词： Music

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Three-dimensional object recognition using an LRS

Three-dimensional object recognition using an LRS

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作者： Mochizuki, Tatsuya Hayashi, Eiji Graduate School of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan Department of Mechanical Information Science and Technology Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9784990288020

Image information provided by cameras is strongly affected by environmental influence of an object's circumjacent circumference. Therefore, in this study, we integrate distance information provided from a laser range sensor (LRS) and image information provided by a camera. This combination reduced environmental influence. This system consists of an object extraction section and a recognition processing section, and we are now developing the object extraction section. First, the object extraction section performs region splitting of image information provided by a camera. The distance information that was provided from the LRS is converted into a set of three-dimensional coordinates that matched the camera image. The integrated processing matches distance information with the image which did the region splitting. And it calculates the distance to each area. It integrates all of the converted information and extracts the object from the integrated information. In this study we inspected the effectiveness of the system by performing an object extraction experiment using the combined integrated distance information and image information. From these results, we have learned how to remove a background and a floor surface by using the distance information, and simpler object extraction was enabled. ©ISAROB 2008.

关键词： Object recognition

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How caching queries at client-peers affects the loads of super-peer P2P systems

How caching queries at client-peers affects the loads of sup...

引用

International Symposium on Information Technology, ITSim

作者： Rozlina Mohamed Christopher D. Buckingham School of Engineering & Applied Science Aston University Birmingham UK Faculty of Computer System & Software Engineering Universiti Malaysia Pahang Kuantan Malaysia

Super-peer P2P systems strike a balance between searching efficiency in centralized P2P systems and the autonomy, load balancing and robustness provided by pure P2P systems. A super-peer is a node in a super-peer P2P system that maintains the central index for the information shared by a set of peers within the same cluster. The central index handles the searching request on behalf of the connecting set of peers and also passes on the request to neighboring super-peers in order to access additional indices and peers. In this paper, we study the behavior of query answering in super-peer P2P systems with the aim of understanding the issues and tradeoffs in designing a scalable super-peer system. We focus on where to post queries in order to retrieve the result and investigate the implications for three different architectures: caching queries at the peer; caching only at the super-peer; and an ordinary P2P system without any caching facilities. We are adopting the existing equation on measuring the network cost for query answering in super-peer systems. In addition, we are adapting the same equation for super-peer system with caching facilities while answering their queries. Using these equations, the cost of query processing for these architectures is compared. The paper discusses the tradeoffs between architectures with respect to caching, highlights the effect of key parameter values on system performance, and ends by considering whether certain knowledge domains are more appropriate for particular architectures.

关键词： Peer to peer computing Query processing Equations Mathematical model Indexes Routing XML

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Enhanced Yoking Proof Protocols for RFID Tags and Tag Groups

Enhanced Yoking Proof Protocols for RFID Tags and Tag Groups

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Jung-Sik Cho Sang-Soo Yeo Suchul Hwang Sang-Yong Rhee Sung Kwon Kim School of Computer Science & Engineering Chung-Ang University Seoul South Korea Department of Computer Science & Communication Engineering Kyushu University Fukuoka Japan Department of Computer System & Engineering Inha Technical Junior College Incheon South Korea Department of Computer Science & Engineering Kyungnam University Masan South Korea

The RFID system is a contactless automatic identification system that identifies tags attached on goods through radio frequency communication. This system is expected to supplant barcode systems, the contact reading technique that is most widely used at present. The RFID system can be applied in a variety of areas. Among those, Ari Juels proposed an environment to prove that a pair of tags has been scanned simultaneously. And he presented a "yoking proof" protocol for this. But the yoking-proof protocol is vulnerable to replay attack. Although modified yoking-proof protocols for alleviating this drawback have been proposed, they are not immune to replay attack, either. In this paper, we analyze problems of existing yoking-proof protocols and present a new protocol, which will make replay attack difficult, based on this analysis. We have also extend this protocol so that it can provide yoking proofs for a tag group, including a multiple number of tags.

关键词： Protocols RFID tags Radiofrequency identification computer science Logistics Privacy Application software computer networks systems engineering and theory Educational institutions

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Towards Reliable Trust Management based on Structural Trust Scopes of Distributed Roles

Towards Reliable Trust Management based on Structural Trust ...

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International Conference on Information Security and Assurance, ISA

作者： Gang Yin Ning Zhou Huaimin Wang School of Computer Science National University of Defense Technology Changsha China System Engineering of China Institute of Electronic Beijing China

Role based trust management uses distributed role hierarchies (DRH) to provide flexible and scalable authorization in multi-domain environments, but DRH are inherently transitive and may easily lead to unexpected or even illegal authorization. In this paper, we propose TS-DRH, a generalized extension of DRH based on a novel trust scope model of distributed roles. TS-DRH introduces the notion of scoped roles with four kinds of structural trust scopes, and uses scoped roles to control the member scopes of senior roles and the permission scopes of junior roles, and thus helps to control the propagation of role memberships and permissions in DRH. This paper also designs rule based semantics and a compliance checking algorithm to compute authorization decisions for TS-DRH.

关键词： Authorization Permission Environmental management Conference management Technology management engineering management Algorithm design and analysis Internet Information security Reliability engineering

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Evaluation of Embodied Avatar Manipulation Based on Talker's Hand Motion by Using 3D Trackball

Evaluation of Embodied Avatar Manipulation Based on Talker's...

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17th IEEE International Symposium on Robot and Human Interactive Communication (RO-MAN 2008), vol.2

作者： Yutaka Ishii Kouzi Osaki Tomio Watanabe Yoshihiro Ban Information Science and Technology Center Kobe University Kobe Hyogo Japan Graduate School of System Engineering Okayama Prefectural University Okayama Japan Faculty of Computer Science and System Engineering Okayama Prefectural University Okayama Japan

Remote talkers can communicate smoothly via their embodied avatars, which represent their interactive behaviors in the same virtual space. In order to enable virtual face-to-face communication, we have developed an embodied avatar-mediated communication system by using a human avatar called "VirtualActor" within the same communication space. The effectiveness of the system has been confirmed by communication experiments. We have already proposed the concept of a virtual communication avatar system in which remote talkers under the restricted conditions can operate their own avatar based on their hand motion, and have developed the prototype of this system using a glove sensor. In this study, communication systems using three pointing devices - a wireless mouse, trackball, and 3D mouse - are developed for primitive interaction using conscious hand motion input in a general PC environment. Instead of a simple trackball, a 3D trackball, which has one handle ball involving yaw rotation as well as pitch and roll rotation, is developed in order to manipulate the avatar's head motion in a more intuitive manner. A communication experiment in which the 3D trackball, wireless mouse, trackball, and 3D mouse are compared is conducted for 15 pairs of talkers (30 in all);a sensory evaluation and analysis of embodied avatar manipulation demonstrate the effectiveness of the proposed system.

关键词： Robots

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Usability evaluation of three unilateral - Propelled wheelchairs for hemiplegic patients

引用

作者： Tsai, Kueng Horng Yeh, C.Y. Lo, H.C. Chang, L.T. Lee, J.S. Lee, C.T. Graduate Institute of System Engineering National University of Tainan Taiwan School of Physical Therapy Chung Shan Medical University Taiwan Institute of Biomedical Engineering National Cheng Kung University Taiwan Department of Childhood Education and Nursery Chia Nan University of Pharmacy and Science Tainan Taiwan Department of Computer Science and Information Engineering National University of Tainan Taiwan

ISBN: (纸本)9783540693666

Most hemiplegic patients use the unaffected arm and leg to propel wheelchair. The asymmetrical forces may cause the wheelchair to stray toward the affected side on level surface, and even cause danger on a slope. Although a variety of designs from mechanical approach have been developed to improve propulsion efficiency and reduce injuries, such as hand-lever drive and crank propulsion, most of them were just designed for users having healthy upper limbs. The purpose of this study was to evaluate the usability and the physiological responses of each of the two new wheelchairs comparing with a commercial two-handrim propelled wheelchair at a rehabilitation center. Two newly designed wheelchairs (ankle-propelled wheelchair (APW), knee-propelled wheelchair (KPW)) were recruited and compared with a commercial two-handrim propelled wheelchair (TPW). 15 stroke patients were recruited from the rehabilitation center of Chung Shan Medical University, Taichung, Taiwan. Subjects propelled the three wheelchairs along an oval-shaped pathway and videotape was made during test for analysis. The parameters, including total propelling time, deviation frequencies, deviation percentage, physiological cost index (PCI), maximum VO2 (VO2max), and rating of perceived exertion (RPE) were measured and compared among the three types of wheelchair. The results show that KPW had the best results in terms of performance evaluation among the three wheelchairs no matter in controllability, cardiopulmonary responses, or RPE. However, the gear ratio of force transmitting system of KPW was fixed, and some patients felt that the propulsion was heavy when starting KPW. It was more suitable and comfortable for hemiplegic patients to use KPW than to propel TPW and APW. If the adjustment of KPW were properly improved, it would be a comfortable device for movement for hemiplegic patients. © 2008 Springer-Verlag.

关键词： Wheelchairs

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Geometrically invariant watermarking using affine covariant regions

Geometrically invariant watermarking using affine covariant ...

引用

2008 IEEE International Conference on Image Processing, ICIP 2008

作者： Deng, Cheng Gao, Xinbo Tao, Dacheng Li, Xuelong Lab of Video and Image Processing System School of Electronic Engineering Xidian University Xi'an China Department of computing Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong School of Computer Science and Information Systems Birkbeck University of London London WC1E7HX United Kingdom

ISBN: (纸本)1424417643

In this paper, we present a robust approach to digital watermarking embedding and retrieval for digital images. The affine-invariant point detector is used to extract feature regions of the given host image. Image normalization and dominant gradient orientation alignment are applied to these feature regions to achieve scaling and rotation invariance. Thereafter, watermarks are embedded in these feature regions. The advantage of this proposed approach is demonstrated by a large amount of experiments, which can against different attacks, such as common image processing, rotation, scaling, cropping, and several other affine transformations. © 2008 IEEE.

关键词： Image processing

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Multi-robot cooperative pursuit based on combinatorial auction mechanism under dynamic environment

Multi-robot cooperative pursuit based on combinatorial aucti...

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2008 2nd International Symposium on systems and Control in Aerospace and Astronautics, ISSCAA 2008

作者： Su, Cai Ze Ning, Sun Li Bo, Gao Hai Cheng, Zhou Pu State Key Laboratory of Advanced Robot and System Harbin Institute of Technology Harbin 150001 Heilongjiang China School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 Heilongjiang China Department of Information Engineering Artillery Academy of PLA Hefei 230031 AnHui Province China

This paper mainly discusses the pursuit-evasion games, in which a team of autonomous mobile robots act as pursuers to pursue multiple moving targets cooperatively. In order to reduce the communication load during the task negotiation process, the auction mechanism in Economics was introduced,and an improved task negotiation process based on Multi-Unit Combinatorial Auction was proposed. It allocated task dynamically through capability classification and independent competition. A kind of multi-robot cooperative pursuit algorithm that allows dynamic alliance is proposed. Simulation results show the feasibility and validity ofthe given algorithm.

关键词： Multipurpose robots

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