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International Conference on Computational science, ICCS 2003

作者： Artoli, A.M. Kandhaiy, D. Hoefsloot, H.C.J. Hoekstra, A.G. Sloot, P.M.A. Section Computational Science Laboratory for Computing Systems Architecture and Programming Faculty of Science University of Amsterdam Kruislaan 403 Amsterdam1098 SJ Netherlands Kramers Laboratorium voor Fysische Technologie Faculty of Applied Sciences Delft Netherlands Department of Chemical Engineering Faculty of Science University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)9783540448600

Surgical planning as a treatment for vascular diseases re- quires fast blood ow simulations that are eÆcient in handling changing geometry. It is, for example, necessary to try diþerent paths of a planned bypass and study the resulting hemodynamic ow ýelds before decid- ing the ýnal geometrical solution. With the aid of a real time interactive simulation environment that uses an eÆcient ow solver, this allows ex- ible treatment planning. In this article, we demonstrate that the lattice Boltzmann method can be an alternative robust CFD technique for such kind of applications. Steady ow in a 2D symmetric bifurcation is studied and the obtained ow ýelds and stress tensor components are compared to those obtained by a Navier-Stokes (NS) solver. We also demonstrate that the method is fully adaptive to interactively changing geometry. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Geometry

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A feed-forward network and its training algorithm for producing sets

A feed-forward network and its training algorithm for produc...

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Proceedings of the IASTED International Conference on Neural Networks and Computational Intelligence

作者： Brouwer, Roelof K. Pedrycz, Witold Department of Computing Science University College of the Cariboo 900 McGill Road Kamloops BC V2C 5N3 Canada Department of Electrical Engineering University of Alberta Edmonton Canada Systems Research Institute Polish Academy of Sciences 01-447 Warsaw Poland

ISBN: (纸本)0889863474

Multilayer perceptions (MLP) or feed forward neural networks (FFNN) are generally used to represent many-to-one (m-o) mappings or functions from ℜn to codomain ℜm. Input units distribute real values to hidden layer units and individual output units produce values in ℜ Thus MLP's represent or simulate the mappings of functions where the range consists of vectors. However it is also useful to represent mappings where the range consists of elements that are sets or collections (bags) of vectors of real values. Representing mappings from vectors to sets of real numbers or vectors of real numbers has a useful application that is of interest since a one-to-many (o-m) mapping from ℜn to codomain ℜ m is equivalent to a m-o mapping from ℜn to codomain P(ℜm) where P(ℜm) is the power set of ℜ m. The paper describes a modified training algorithm that successfully stores a one-to-many mapping on a feed-forward network requiring a relatively small number of training epochs.

关键词： Feedforward neural networks

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Utilizing neural networks to reduce packet loss in self-similar teletraffic patterns

Utilizing neural networks to reduce packet loss in self-simi...

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IEEE International Conference on Communications (ICC)

作者： H. Yousefi'zadeh E.A. Jonckheere J.A. Silvester Center for Pervasive Communications and Computing Electrical Engineering and Computer Science Department University of California Irvine USA Department of Electrical Engineering-Systems University of Southern California USA

Reducing packet loss and increasing overall efficiency in multiple source queuing systems is one of the most important issues in the design of traffic control algorithms. On the other hand, the other important issue in such systems is to provide every individual source with the ability to take advantage of a fair portion of the shared available resources such as buffer space or server bandwidth. In this paper a novel technique for reducing packet loss in a class of queuing systems with self-similar traffic patterns is introduced. The technique takes advantage of the modeling power of neural networks to offer a dynamic buffer management scheme capable of efficiently addressing the trade off between packet loss and fairness issues.

关键词： Neural networks Intelligent networks Traffic control Partitioning algorithms Bandwidth Telecommunication traffic Power system modeling Power system management Heuristic algorithms Algorithm design and analysis

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GridBank: a Grid Accounting Services Architecture (GASA) for distributed systems sharing and integration

GridBank: a Grid Accounting Services Architecture (GASA) for...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： A. Barmouta R. Buyya Department of Computer Science and Software Engineering University of Western Australia Nedlands WA Australia Grid Computing and Distributed Systems (GRIDS) Lab Department of Computer Science and Software Engineering University of Melbourne Australia

Computational Grids are emerging as a new infrastructure for Internet-based parallel and distributed computing. They enable the sharing, exchange, discovery, and aggregation of resources distributed across multiple administrative domains, organizations and enterprises. To accomplish this, Grids need infrastructure that supports various services: security, uniform access, resource management, scheduling, application composition, computational economy, and accounting. Although several initiatives are engaged in the development of Grid technologies, Grid accounting issues are yet to be addressed. To overcome this limitation, we propose a new infrastructure called GridBank that provides services for accounting. The support of computational economy and accounting services can lead to a self-regulated accountability in Grid computing. This paper presents requirements of Grid accounting and different economic models within which it can operate and proposes a Grid Accounting Services Architecture to meet them. The paper highlights implementation issues with a detailed discussion on the format for various records/databases that the GridBank needs to maintain. It also presents protocols for interaction between the GridBank and various components within Grid computing environments.

关键词： Grid computing Computer architecture Distributed computing Concurrent computing Internet Security Resource management Processor scheduling Computer applications Environmental economics

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Web-based haptic applications for blind people to create virtual graphs

Web-based haptic applications for blind people to create vir...

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

作者： Wai Yu K. Kangas S. Brewster Virtual Engineering Centre Queen's University Belfast UK Glasgow Interactive Systems Group Department of Computing Science University of Glasgow UK

Haptic technology has great potentials in many applications. This paper introduces our work on delivery haptic information via the Web. A multimodal tool has been developed to allow blind people to create virtual graphs independently. Multimodal interactions in the process of graph creation and exploration are provided by using a low-cost haptic device, the Logitech WingMan Force Feedback Mouse, and Web audio. The Web-based tool also provides blind people with the convenience of receiving information at home. In this paper, we present the development of the tool and evaluation results. Discussions on the issues related to the design of similar Web-based haptic applications are also given.

关键词： Haptic interfaces Educational institutions Virtual reality Pins Interactive systems Force feedback Mice Visualization Image converters Fingers

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Evaluation of multimodal graphs for blind people

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Universal Access in the Information Society 2003年第2期2卷 105-124页

作者： Yu , Wai Brewster , Stephen Virtual Engineering Centre Queen’s University Belfast Belfast UK Glasgow Interactive Systems Group Department of Computing Science University of Glasgow U.Room S131 Glasgow UK

This paper introduces the development of a multimodal data visualisation system and its evaluations. This system is designed to improve blind and visually impaired people’s access to graphs and tables. Force feedback, synthesized speech and non-speech audio are utilised to present graphical data to blind people. Through the combination of haptic and audio representations, users can explore virtual graphs rendered by a computer. Various types of graphs and tables have been implemented, and a three-stage evaluation has been conducted. The experimental results have proven the usability of the system and the benefits of the multimodal approach. The paper presents the details of the development and experimental findings, as well as the changes of role of haptics in the evaluation.

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Real-time path planning with deadlock avoidance of multiple cleaning robots

Real-time path planning with deadlock avoidance of multiple ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Chaomin Luo S.X. Yang D.A. Stacey Advanced Robotics and Intelligent Systems (ARIS) Laboratory School of Engineering University of Guelph Guelph ONT Canada Department of Computing and Information Science University of Guelph Guelph ONT Canada

In this paper, a cooperative sweeping strategy with deadlock avoidance of complete coverage path planning for multiple cleaning robots in a changing and unstructured environment is proposed, using biologically inspired neural networks. Cleaning tasks require a special kind of trajectory being able to cover every unoccupied area in specified cleaning environments, which is an essential issue for cleaning robots and many other robotic applications. Multiple robots can improve the work capacity, share the cleaning tasks, and reduce the time to complete sweeping tasks. In the proposed model, the dynamics of each neuron in the topologically organized neural network is characterized by a shunting neural equation. Each cleaning robot treats the other robots as moving obstacles. The robot path is autonomously generated from the dynamic activity landscape of the neural network, the previous robot location and the other robot locations. The proposed model algorithm is computationally efficient. The feasibility is validated by simulation studies on three cases of two cooperating cleaning robots. The multiple cleaning robots sweeping will not be trapped in deadlock situations.

关键词： Path planning System recovery Cleaning Orbital robotics Robot sensing systems Intelligent robots Neural networks Computational modeling Chaos Intelligent systems

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A Design of Temporal Event Extraction from Chinese Financial News

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International Journal of Computer Processing of Languages 2003年第1期16卷 21-39页

作者： WENJIE LI KAM-FAI WONG CHUNFA YUAN Department of Computing The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong Shatin N.T. Hong Kong China Department of Computer Science and Technology Tsinghua University Beijing 100084 P.R. China

This paper presents an information system for Chinese Information Extraction from Financial news (CHIEF). The ultimate target of the system is to extract information concerning the occurrence time and places of the financial activities in the different companies from a local Hong Kong newspaper, namely (Tao Kung Pao). To facilitate event extraction purpose, two groups of templates were defined, i.e. the company related and company restructuring templates. They are used to select the desired information for each type of financial activities, such as (bankruptcy) or (merge). Each specific event is then represented using a frame-based knowledge structure. Two types of slots are embedded in each frame: they are the activity- and time-related slots. Based on these slots, multiple activities are interconnected according to their entity relations, temporal relations or the deduced relations. Effectively, CHIEF is a question-answering system designed for handling the company related queries, event based queries, temporal queries and complex queries in a finance domain.

关键词： Chinese Language Temporal Information Event Extraction

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Development of a system for experiencing tactile sensation from a robot hand by electrically stimulating sensory nerve fiber

Development of a system for experiencing tactile sensation f...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： M. Shimojo T. Suzuki A. Namiki T. Saito M. Kunimoto R. Makino H. Ogawa M. Ishikawa K. Mabuchi Mechanical Engineering and Intelligent Systems The University of Electro-Communications Chofu-shi JAPAN Department of Information Physics and Computing Graduate School of Information Science and Technology University of Tokyo Tokyo Japan Department of Information Physics and Computing The University of Tokyo Bunkyo-ku Tokyo Japan

Research attempting to merge human and mechanical systems through a nervous system is one of the most dynamic fields in interface technology. Recently, artificial cochlear and retinal nerves were connected via a nervous system. However, there has been no report concerning the replacement of human tactile sensation by artificial sensors connected to the tactile sensory nerve system. The present study reports the development of a system which enables the touch strength applied to a robot hand to be sensed and applied to the hand of a human operator via the microstimulation method. The operator controls the grasping action of a robot hand equipped with tactile sensors at a remote location via a network. The contact information between an object and the robot hand is transmitted via the network, and the tactile sensory nerve of the operator is stimulated by a microelectrode. The force applied to the robot hand can be sensed as an applied force to the hand of the human operator. Applications of the proposed system include the presentation of tactile perception in remote manipulation. In addition, the proposed system is an effective method for transmitting sensation from artificial limbs. The present paper describes the experimental system and results.

关键词： Robot sensing systems Nerve fibers Humans Nervous system Tactile sensors Force sensors Mechanical systems Retina Mechanical sensors Sensor systems

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Experiential telepresence: How can telepresence research be guided towards better end user experience?

Experiential telepresence: How can telepresence research be ...

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2003 ACM SIGMM Workshop on Experiential Telepresence, ETP '03

作者： Hayes-Roth, Barbara Henderson, Austin Jain, Ramesh Manovich, Lev Welch, Greg Pingali, Gopal Extempo Systems Inc. United States MIT United States Systems Laboratory in the Advanced Concepts and Technology Group of Pitney Bowes United States School of Electrical and Computer Engineering College of Computing Georgia Institute of Technology United States Department of Computer Science and Engineering University of Michigan Ann Arbor MI United States University of California San Diego CA United States Visual Arts Department University of California San Diego CA United States Computer Science Department University of North Carolina Chapel Hill NC United States IEEE Computer Society ACM United States IBM T.J. Watson Research Center 19 Skyline Drive Hawthorne NY 10532 United States

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