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International Workshop on Services in distributed and Networked Environments

作者： C.J. Biggs W. Brookes J. Indulska CRC for Distributed Systems Technology Department of Computer Science University of Queensland Brisbane QLD Australia

Presents an enhancement to the OSF DCE platform for distributed computing that is designed to enhance the interoperability of applications. Concepts from open distributed processing (ODP) have been taken, extended and applied to DCE, to improve the capacity for late binding, system evolution, resource discovery and software reusability. This paper analyzes approaches to application interoperability in a number of distributed computing platforms and based on the results, describes an enhancement for the DCE platform. The paper focuses on one component of this enhancement: a type manager that is able to canonically describe types of interacting objects and types of relationships between them.< >

关键词： distributed computing Application software distributed processing Large-scale systems Open systems computer science Object oriented modeling Standards development Cyclic redundancy check Paper technology

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Towards cooperative user interfaces: an object-oriented application integration approach

Towards cooperative user interfaces: an object-oriented appl...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Hung Wing R.M. Colomb CRC for Distributed Systems Technology Department of Computer Science University of Queensland Brisbane QLD Australia

The development of a cooperative user interface is a vital and interesting issue due to the lack of common access and limited sharing of data among applications. In this paper, we propose a new design framework which can be used as a platform to access and integrate applications in a cooperative manner. In particular, the paper describes how applications can be integrated by using an object-oriented database approach. With this approach, the mapping between the application input/output streams and the database objects promotes the transparency of information transfer among applications.

关键词： User interfaces Object oriented databases Application software distributed databases distributed computing Object oriented modeling Protocols Cyclic redundancy check computer science Postal services

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Application of optical flow for automated overtaking control

Application of optical flow for automated overtaking control

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IEEE Workshop on Applications of computer Vision (WACV)

作者： M. Tistarelli F. Guarnotta D. Rizzieri F. Tarocchi Department of Communication Computer and Systems Science (DIST) Laboratory for Integrated Advanced Robotics (LIRA-Lab) University of Genoa Genoa Italy

In this paper the problem of automated control of a road vehicle is addressed. In particular, a system is presented where optical flow techniques are applied to monitor overtaking maneuvers of other vehicles coming from the rear of the car. During car driving, most visual information is conveyed by the motion perceived within the visual field. The proposed approach for overtaking control is based on the computation of the optical flow (or the normal flow) from an image stream acquired from a camera sensor mounted on board of the vehicle. The method applies for a road vehicle and constitutes a building block of a software and hardware architecture devised to provide helpful information as an aid to the driver. Several experiments are presented from real image sequences.< >

关键词： Image motion analysis Automatic control Optical control Optical sensors Road vehicles Optical computing Monitoring Streaming media Cameras Image sensors

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A design method of self-tuning PID controllers

A design method of self-tuning PID controllers

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American Control Conference (ACC)

作者： T. Yamamoto S. Omatu M. Kaneda Department of Communication Engineering and Systems Engineering Faculty of Computer Science Okayama Prefectural University Soja Okayama Japan Department of Information Science and Intelligent Systems Faculty of Engineering University of Tokushima Tokushima Japan

PID control schemes based on classical control theory, have been widely used for real control systems. Further, there are a lot of researches on control schemes of tuning PID gains. Also several self-tuning and autotuning techniques in the PID control systems have been reported for systems with unknown parameters. However, to the best of our knowledge, there is no result for discrete-time systems with unknown time-delays. On the other hand, a generalized predictive control scheme has been reported as a useful self-tuning control technique for unknown time-delay systems. In this paper, we present a self-tuning PID control algorithm for unknown time-delay systems based on minimization of a GPC criterion. Furthermore, we illustrate a numerical simulation result in order to show the effectiveness of this method.

关键词： Design methodology Control systems Three-term control communication system control Tuning Design engineering systems engineering and theory computer science Predictive control Minimization methods

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Lipreadable frame animation driven by speech parameters

Lipreadable frame animation driven by speech parameters

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International Symposium on Speech, Image Processing and Neural Networks

作者： F. Lavagetto D. Arzerello M. Caranzano DIST-Department of Communication Computer and Systems Science University of Genova Genoa Italy Dept. of Commun. Genoa Univ. Italy

Two different approaches are here presented for converting speech into graphic animation, suitable to lipreading. Coarticulation modeling has been taken into account by means of an original algorithm for multistep statistical processing of digital speech in the cepstrum space. Two different visualization methods have been used, the first based on key reference pictures and the second based on a parametric flexible structure. Speech is converted, in real-time, into lipreadable visual animation by associating incoming acoustic frames with correspondent consistent graphic primitives, pictures or parameters, suitably visualized. Multiple fields of application are foreseen, mainly in rehabilitation, training, education and communication among hard of hearing people.< >

关键词： Animation Auditory system Mouth Speech processing Lips Visualization Graphics Humans Acoustic noise Acoustical engineering

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OBLIQUELY PROPAGATING WAVES ALONG DIELECTRIC WAVEGUIDES WITH SLANTED GRATINGS

OBLIQUELY PROPAGATING WAVES ALONG DIELECTRIC WAVEGUIDES WITH...

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The 1994 International Conference on Computational Electromagnetics and Its Applications

作者： Katsu Rokushima Keiji Matsumoto Jiro Yamakita Department of Information Systems Engineering Osaka Sangyo University Daito. Osaka 574 Japan Department of Information Systems Engineering Osaka Sangyo University Daito. Osaka 574 Japan Department of Computer and Communication Science. Okayama Prefectural University Soujya. Okayama 719 Japan

Propagation characteristics of guided wares in dielectric wareguides with, slanted gratings is presented for the general three-dimensional cases of oblique propagation. The analysis is formulated in a unified matrix form so that guidance, properties can be obtained accurately in any level by systematic matrix calculations. The numerical results an given for a grating with square corrngation and the effects of the slant angle and oblique propagation is clarified.

关键词： OBLIQUELY PROPAGATING WAVES ALONG DIELECTRIC WAVEGUIDES WITH SLANTED GRATINGS

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Trajectory planning and real-time control of an autonomous mobile robot equipped with vision and ultrasonic sensors

Trajectory planning and real-time control of an autonomous m...

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Proceedings of IEEE/RSJ International Conference on Intelligent Robots and systems (IROS'94)

作者： C. Innocenti G. Mondino P. Regis G. Sandini Department of Communication Computer and Systems Science Laboratory for Integrated Advanced Robotics (LIRA-Lab) University of Genova Liguria Italy AITEK S.r.l Liguria Italy Universita degli Studi di Genova Genova Liguria IT Dept. of Commun. Comput. & Syst. Sci. Genoa Univ. Italy

The aim of this paper is to discuss and present a navigation architecture for an autonomous mobile robot, based on the integration of ultrasonic sensors and stereo vision. The distinctive features are the integration of a "classical" planning approach and subsumption architecture for obstacle avoidance, and the fusion of visual and ultrasonic sensory data. The goal of the experiment is to plan missions between two user defined points in the environment, autonomously avoiding static and dynamic obstacles along the planned path.< >

关键词： Trajectory Mobile robots Robot sensing systems Navigation Robot kinematics Control systems Orbital robotics Real time systems communication system control Sensor systems

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BROAD-BAND ISLAND INTERCONNECTION VIA SATELLITE - PERFORMANCE ANALYSIS FOR THE RACE-II CATALYST PROJECT

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INTERNATIONAL JOURNAL OF SATELLITE communicationS 1994年第3期12卷 223-238页

作者： HADJITHEODOSIOU, MH KOMISARCZUK, P COAKLEY, F EVANS, BG SMYTHE, C Centre for Satellite Engineering Research University of Surrey Guildford GU2 5XH U.K. Obtained an M.A. in Electrical and Information Sciences from the University of Cambridge in 1989 and an M.S. in Electrical Engineering from the University of California Irvine in 1991. He is currently a Research Fellow at the Centre for Satellite Research University of Surrey U.K. His research interests include multiple access protocols for VSAT networks voice/data integration in low-bit-rate networks and the use of satellites for the provision of BISDN services. Obtained a B.Sc. in Pure and Applied Physics with Electronics in 1983 and an M.Sc. in Modern Electronics in 1984 from the University of Nottingham U.K. He was a project engineer on the Corporate Data Network for the Central Electricity Generating Board U.K. and then a senior lecturer in communication systems at the University of Greenwich UK. At present he is working on his Ph.D. at the Centre for Satellite Engineering Research (CSER) University of Surrey on the performance of communication systems. Has been Senior Lecturer in the Department of Electrical Engineering University of Surrey since 1984. She is the author (or joint author) of more than 80 research papers. Currently she teaches courses in Telecommunication Networks and Computer Architecture. Her research interests include on-board processing for satellites protocols and performance issues. Received the BSc. and Ph.D. degrees in Electrical Engineering and Microwave Systems from the University of Leeds in 1965/1968. He was British Telecom Lecturer-Reader in Telecommunications Systems at the University of Essex from 1969–1983. In 1983 he was appointed to the Alec Harley Reeves Chair of Information Systems Engineering at the University of Surrey and in 1990 became the first Director of the post-graduate centre for Satellite Engineering Research which houses some 100 researchers. In 1992 he was made a Fellow of the Royal Academy of Engineers in the U.K. and is a Fellow of IEE and a member of IEEE

The use of communication satellites as a possible way of offering broadband island interconnectivity appears to be a very attractive option, as it will enable the provision of an all-digital, transparent service to a number of ATM islands spanning a wide area, accommodating efficiently a variety of traffic demands. The CATALYST Project (RACE II/R2074) is an attempt to demonstrate the applicability and compatibility of satellite technology with the terrestrial BISDN. In this paper we present an overview of the project and focus on an initial study of the expected user performance through the CATALYST network. Our analysis is based upon mathematical and simulation models and describes the end-system to end-system transfer delay for given message lengths. The protocol profiles assume a mix of Novell NetWare and Network File System client/server architectures, which are supported by either the IEEE 802.3/Ethernet or fibre distributed data interface LANs, which are themselves linked via LAN/ATM/satellite interface units. Areas of further investigation, and the implication of our analysis on the actual network architecture, are discussed.

关键词： ASYNCHRONOUS TRANSFER MODE (ATM) BROAD-BAND ISDN SATELLITE communicationS

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The olympus attitude and orbital control system: A case study in hard real-time system design and implementation 12th

The olympus attitude and orbital control system: A case stud...

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12th Ada-Europe International Conference, 1993

作者： Burns, A. Wellings, A.J. Bailey, C.M. Fyfe, E. Real-time and Distributed Systems Research Group Department of Computer Science University of York United Kingdom British Aerospace Space Systems Ltd Communication Satellites Division Stevenage United Kingdom

ISBN: (纸本)9783540568025

This paper describes the details of, and the experiences gained from, a case study undertaken by the authors on the design and reimplementation of the Olympus Satellite’s Attitude and Orbital Control systems (AOCS). The goal of the study was to demonstrate that real-time systems can be implemented using Ada and its tasking facilities. The system was designed using HRT-HOOD, analysed using Deadline Monotonic Scheduling Analysis, and implemented on a M68020-based system using a modified York compiler and run-time support system (the modifications are compatible with those proposed for Ada 9X). Our results indicate that systems can be designed to have the flexibility given by multi-tasking solutions, and yet still obtain the same levels of guarantees as those given by cyclic executives. © Springer-Verlag Berlin Heidelberg 1993.

关键词： Control systems

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Secure environment for information systems in medicine 3

Secure environment for information systems in medicine

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3rd International Conference on Image Management and communication in Patient Care: Requirements, Implementation and Assessment of Digital Imaging in Medicine, IMAC 1993

作者： Patel, Ahmed Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

ISBN: (纸本)0818636408

This paper presents the Secure Environment for Information systems in Medicine (SEISMED) project which is funded by the Commission of the European Commzlnities (CEC) under the Advance Informatics in Medicine (AIM) programme. It discusses the aims and objectives of the project, its technical approach and results realised todate. It also gives an overview of the remainder of the work which will be undertaken up to the end of 1994. © 1993 IEEE.

关键词： Information systems

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