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Path-bounded one-way multihead finite automata

Path-bounded one-way multihead finite automata

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作者： Inoue, Satoshi Inoue, Katsushi Ito, Akira Wang, Yue Hitachi Ltd. Kawasaki-shi Japan Department of Computer Science and Systems Engineering Faculty of Engineering Yamaguchi University Ube-shi 755-8611 Japan Media and Information Technology Center Yamaguchi University Ube-shi 755-8611 Japan

For each positive integer r ≥ 1, a nondeterministic machine M is r path-bounded if for any input word x, there are r computation paths of M on x. This paper investigates the accepting powers of path-bounded one-way (simple) multihead nondeterministic finite automata. It is shown that for each k ≥ 2 and r ≥ 1, there is a language accepted by an (r+1) path-bounded one-way nondeterministic k head finite automaton, but not accepted by any r path-bounded one-way nondeterministic k head finite automaton whether or not simple. Copyright © 2005 The Institute of Electronics, information and Communication Engineers.

关键词： Finite automata

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Molecular-dynamics study on fracutre property of amorphous metal with crystallization

Molecular-dynamics study on fracutre property of amorphous m...

引用

11th International Conference on Fracture 2005, ICF11

作者： Matsumoto, R. Nakagaki, M. Nakatani, A. Kitagawa, H. Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka 820-8502 Japan Department of Adaptive Machine Systems Graduate School of Engineering Osaka University 2-1 Yamada-Oka Suita-City Osaka 565-0871 Japan Department of Energy and Mechanical Engineering Faculty of Engineering Doshisha University 1-3 Tatara Tsudani Kyotanabe-City Kyoto 610-0394 Japan

ISBN: (纸本)9781617820632

The fracture property of amorphous metal was studied by a large scale molecular dynamics (MD) simulation. The Finnis-Sinclair potential for α-iron was used as an inter-atomic potential. At first, we made a model amorphous metal by melting-rapid quenching simulation. And then a crystal growth simulation in the amorphous was performed. We used circular model, and the cracktip is assumed to be at the center. In order to analyze the crack growth characteristics in an infinite domain, the linear elastic solution of Mode I crack was used as a boundary condition. The periodic boundary condition was used to the thickness direction. The crack opens in similar fashion and it has smooth surfaces during the amorphous state. As it deformed, some clusters of bcc-crystal nucleate around the cracktip and they grow rapidly. The distribution of deformation zones and deformation mechanism are significantly altered. The grains are not deformed while they are relatively small. The emission of dislocations from the cracktip is observed, after the crystal phase covered the crack-tip surfaces. The grain size appeared small in the vicinity of the crack-tip, and becomes gradually large as it separates form the crack-tip.

关键词： Crack tips

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Digital Image Scaling

Digital Image Scaling

引用

IEEE Instrumentation and Measurement technology Conference

作者： I. Andreadis A. Amanatiadis Laboratory of Electronics Section of Electronics and Information Systems Technology Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece

The proposed scaling algorithm outperforms other standard and widely used scaling techniques. The algorithm uses a mask of maximum four pixels and calculates the final luminosity of each pixel combining two factors; the percentage of area that mask covers from each source pixel and the difference in luminosity between the source pixels. The interpolation is capable of scaling both grey-scale and color images of any resolution in any scaling factor. Its key characteristics and low complexity make the interpolation very fast and capable of real time implementation. The performance results in a variety of standard tests are presented and compared to other scaling algorithms

关键词： Digital images Pixel Filters Interpolation Testing Color Image resolution Laboratories information systems Tellurium

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Space-time-frequency turbo code over time-varying and frequency-selective fading channel

Space-time-frequency turbo code over time-varying and freque...

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作者： Ishii, Kouji Kohno, Ryuji Division of Electrical and Computer Engineering Faculty of Engineering Yokohama National University Yokohama-shi 240-8501 Japan Kagawa University Japan Departmant of Reliability-based Information Systems Engineering Kagawa University Japan IEEE Japan Division of Physics Electrical and Computer Engineering Yokohama National University Japan Japan Engineering Sciences Society IEICE IEICE Technical Committee on Spread Spectrum Technology ITS

In this paper, we propose and investigate space-time-frequency turbo coded OFDM transmissions through time-varying and frequency-selective fading channel. The proposed turbo code is a serial concatenated convolutional code which consists of space-frequency and time-frequency domain codes. The aim of the proposed turbo code is to obtain both diversity and coding gains over space-time-frequency domain. Using computer simulations and EXtrinsic information Transfer (EXIT) charts, we investigate the optimum structure of inner and outer codes. Simulations demonstrate that the proposed system leads to significantly enhanced performance. Moreover, we analyze the computational complexity. Copyright © 2005 The Institute of Electronics, information and Communication Engineers.

关键词： Turbo codes

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Risk in Trusted Decentralized Communications

Risk in Trusted Decentralized Communications

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International Conference on Data engineering Workshops

作者： O.K. Hussain E. Chang F.K. Hussain T.S. Dillon B. Soh School of Information Systems Curtin University of Technology WA Australia Faculty of Information Technology University of Technology Sydney NSW Australia Department of Computer Science and Computer Engineering La Trobe University VIC Australia

Risk is associated with almost every activity that is undertaken on a daily life. Risk associated with Trust, Security and Privacy. Risk is associated with transactions, businesses, information systems, environments, networks, partnerships, etc. Generally speaking, risk signifies the likelihood of financial losses, human casualties, business destruction and environmental damages. Risk indicator gives early warning to the party involved and helps avoid deserters. Until now, risk has been discussed extensively in the areas of investment, finance, health, environment, daily life activities and engineering. However, there is no systematic study of risk in Decentralised communication, which involves e-business, computer networks and service oriented environment. In this paper, we define risk associated with trusted communication in e-business and e-transactions; provide risk indicator calculations and basic application areas.

关键词： information systems Uncertainty Australia Investments Finance information technology computer science information security Privacy Humans

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A methodology for determining riskiness in peer-to-peer communications

A methodology for determining riskiness in peer-to-peer comm...

引用

IEEE International Conference on Industrial Informatics (INDIN)

作者： O.K. Hussain E. Chang F.K. Hussain T.S. Dillon B. Soh School of Information Systems Curtin University of Technology W.A. Australia Faculty of Information Technology University of Technology Sydney NSW Australia Dept of Computer Science and Computer Engineering La Trobe University VIC Australia

Every activity has some risk involved in it. Analyzing the risk involved in a transaction is important to decide whether to proceed with the transaction or not. Similarly in peer-to-peer communication analyzing the risk involved in undertaking a transaction with another peer too is important. It would be much easier for the trusting peer to make a decision of proceeding a transaction with the trusted peer if he knows the risk that the trusted peer is worthy of. In this paper we develop and propose such a methodology which allows the trusting peer to rate the trusted peer in terms of risk that he deserves after the transaction is over.

关键词： Peer to peer computing Uncertainty Australia Risk analysis information systems information technology computer science Internet Environmental economics Cost benefit analysis

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A method for fast rendering of caustics from refraction by transparent objects

A method for fast rendering of caustics from refraction by t...

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作者： Iwasaki, Kei Yoshimoto, Fujiichi Dobashi, Yoshinori Nishita, Tomoyuki Faculty of Systems Engineering Wakayama University Wakayama-shi 640-8510 Japan Graduate School of Information Science and Technology Hokkaido University Sapporo-shi 060-0814 Japan Graduate School of Frontier Science University of Tokyo Kashiwa-shi 277-8510 Japan Department of Computer and Communication Sciences Wakayama University Wakayama Japan

Caustics are patterns of light focused by reflective or refractive objects. Because of their visually fascinating patterns, several methods have been developed to render caustics. We propose a method for the quick rendering of caustics formed by refracted and converged light through transparent objects. First, in the preprocess, we calculate sampling rays incident on each vertex of the object, and trace the rays until they leave the object taking refraction into account. The position and direction of each ray that finally transmits the transparent object are obtained and stored in a lookup table. Next, in the rendering process, when the object is illuminated, the positions and directions of the rays leaving the object are calculated using the lookup table. This makes it possible to render refractive caustics due to transparent objects at interactive frame rates, allowing us to change the light position and direction, and translate and rotate the object. Copyright © 2005 The Institute of Electronics, information and Communication Engineers.

关键词： Pattern recognition

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A design and development of dialog pattern based bulletin board tool

A design and development of dialog pattern based bulletin bo...

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IADIS International Conference on Cognition and Exploratory Learning in Digital Age, CELDA 2005

作者： Takaoka, Ryo Kusano, Kohei Okamoto, Toshio Faculty of Education Yamaguchi University 1677-1 Yoshida Yamaguchi-City Yamaguchi 753-8513 Japan Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka-City Fukuoka 820-8502 Japan Graduate School of Information Systems University of Electro-Communications 1-5-1 Chofugaoka Chofu-City Tokyo 182-8585 Japan

ISBN: (纸本)9781627483308

This study is to explore a method of learning support in e-Learning environment including some learning supporters. Especially we develop a learning support method of distance teaching assistants on the Web for problem solving based group learning. We need to explore the learning models of next generation in knowledge society. Simultaneously, challenge to new pedagogy in learning and education with e-Learning environment is desired. From a viewpoint of learning support, learners can be concerned with learning supporters such as other teachers, domain experts and learners who have already studied the subject matter as well as a teacher at the face-to-face lesson in the learning environment. So, the learning support model needs to include some tools which have some functions of the learning supports. In this paper, we extract learning support patterns from an analysis of dialogue patterns between learners and distance teaching assistants. Moreover, we describe the outline of a bulletin board tool based on the learning support patterns.

关键词： Teaching

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CME: a temporal relational model for efficient coalescing

CME: a temporal relational model for efficient coalescing

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International Workshop on Temporal Representation and Reasoning (TIME)

作者： M. Al-Kateb E. Mansour M.E. El-Sharkawi Department of Computer Science College of Engineering and Mathematics University of Vermont VT USA Department of Computer Science School of Computing Dublin Institute of Technology Dublin Ireland Department of Information Systems Faculty of Computers and Information Cairo University Giza Egypt

Coalescing is a data restructuring operation applicable to temporal databases. It merges timestamps of adjacent or overlapping tuples that have identical attribute values. The likelihood that a temporal query employs coalescing is very high. However, coalescing is an expensive and time consuming operation. In this paper, we present a novel temporal relational model through which coalescing becomes quite simple. The basic idea is to augment each time-varying attribute in a temporal relation with two additional attributes that trace changes in values of the corresponding time-varying attribute. One attribute traces changes in values with respect to each individual instance (i.e. tuples having the same key value), while the other attribute traces changes in values globally for all instances (i.e. all tuples in the temporal relation). Using these tracing attributes, coalescing could be easily implemented through a quite simple join-free group-by query. The coalescing query is fully processed and optimized by the underlying database management system.

关键词： Remuneration Hardware Marketing and sales computer science Relational databases EMP radiation effects History Educational institutions Data engineering Mathematics

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Energy-optimal online algorithms for broadcasting in wireless networks

Energy-optimal online algorithms for broadcasting in wireles...

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Annual Conference on Wireless On Demand Network systems and Services (WONS)

作者： S. Kutten H. Ono D. Peleg K. Sadakane M. Yamashita Faculty of Industrial Engineering and Management Information Systems Group Technion-Israel Institute of Technology Haifa Israel Department of Computer Science and Communication Engineering Kyushu University Fukuoka Japan Department of Computer Science and Applied Mathematics Weizmann Institute of Science Rehovot Israel

The paper considers the design of energy-efficient online protocols for the basic problem of message transmission to hosts positioned at unknown distances in ad-hoc wireless networks. The paper formulates a number of ... 详细信息

关键词： Broadcasting Wireless networks Energy efficiency Energy consumption Wireless application protocol Algorithm design and analysis computer science Multicast algorithms Attenuation Decoding

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