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检索条件"任意字段=Proceedings of the 22nd International Conference on Distributed Computing and Networking"

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A software architecture for image acquisition and camera control in an active computer vision system

A software architecture for image acquisition and camera con...

引用

22nd international conference on Information Technology Interfaces, ITI 2000

作者： Šegvić, Siniša Stanisavljević, Vladimir Kalafatić, Zoran Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing Unska 3 10000 Zagreb Croatia

ISBN: (纸本)9539676916

In a system for active computer vision, there is an intrinsic need for interfacing two different kinds of specific hardware devices: image digitizer and controllable camera. The architecture of software components responsible for these interfaces must be carefully designed in order to achieve their scalability, testability, maintainability, reusability and portability. Hardware abstraction is a major concern in this context since it allows to compile and test other system components independently of actual devices and their manufacturers. The paper reports on a feasible solution to the problem having many of the desired properties, using the object oriented design methodology. The designed architecture have been successfully implemented, in combination with several actual mechanisms for image acquisition and camera control. © 2000 Univ of Zagreb.

关键词： distributed computer systems

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The Virtual Laboratory project

The Virtual Laboratory project

引用

international conference on Information Technology Interfaces

作者： G. Muzak I. Cavrak M. Zagar Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

ISBN: (纸本)9539676916

This paper describes the idea and implementation of a virtual laboratory. The lab supports faculty courses on embedded systems, the development of control algorithms, distributed systems and open computing systems. A brief description of the virtual laboratory environment is given and its hardware and software components are described. A comparison with classic laboratory environments is made. The use of the system in the training process is described. Further developments and enhancements are discussed.

关键词： Laboratories Object oriented modeling Network servers Ethernet networks Control systems Embedded computing Hardware Electrical equipment industry Embedded system distributed control

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Denoising of Monte Carlo dose distributions

Denoising of Monte Carlo dose distributions

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： J.O. Deasy Mallinckrodt Institute of Radiology Washington University School of Medicine Saint Louis MO USA

The Monte Carlo (MC) method has long been viewed as the ultimate dose distribution computational technique, due to its capability of realistically accounting for underlying physical processes and anatomical information. The inherent stochastic fluctuations (i.e., noise) in the resulting dose distributions, however, have several important effects: noise will affect estimations of all the relevant dosimetric and radiobiological indices; noise degrades the resulting visualizations, e.g. isodose plots, which are used to guide treatment planning; and the noise level dictates the computation time. We ask the question whether it is feasible to introduce a post-processing step which reduces statistical fluctuations in the MC dose distribution. We call this process denoising. It may also be referred to as filtering or smoothing. We present a few limited results for a homogeneous and a step-heterogeneity phantom. Our initial investigations support the hypothesis that denoising of MC dose distributions is, to some degree, feasible.

关键词： Noise reduction Monte Carlo methods Noise level distributed computing Fluctuations Physics computing Stochastic resonance Degradation Visualization Filtering

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Workflow-based approach towards distributed health care applications [ECG application]

Workflow-based approach towards distributed health care appl...

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： P. Ganguly P. Ray N. Lovell School of Information Systems Technology and Management University of New South Wales Sydney Australia Graduate School of Biomedical Engineering University of New South Wales Sydney Australia

ISBN: (纸本)0780364651

The provision of telemedicine services involves integration of information, human-machine and health care technologies. As different modalities of patient care require applications running on heterogeneous computing environment, distributed health care applications are a major issue in telemedicine. A distributed application integrates resources located at distant places through networking, These resources include diagnostic instruments, medical expertise, hospital care and other related administrative services in health care applications. A workflow based methodology for development and implementation of distributed health care applications is presented. The workflow methodology involves process modeling, workflow design and implementation, and system evaluation. Using the specific example of a distributed telecardiology application, issues related to workflow management are reviewed and a design methodology to develop a distributed telecardiology system is proposed. The ECG process includes; data acquisition; encoding, transmission and storage; pattern recognition and feature extraction; and diagnostic classification. The key identified elements of the workflow implementation are; the point of need user; the assessor in the online diagnostic center; ECG knowledge repositories; online specialist and the further care center. As illustrated through the telecardiology case study, the proposed methodology can be effectively used as a guideline to develop distributed health care applications in other telecare areas.

关键词： Medical services Telemedicine Electrocardiography Man machine systems distributed computing Instruments Medical diagnostic imaging Hospitals Process design Design methodology

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Design of wide bandwidth, flat phase Al/sub x/O/sub y/-GaAs DBR mirrors for vertical cavity surface-emitting lasers

Design of wide bandwidth, flat phase Al/sub x/O/sub y/-GaAs ...

引用

international conference on Microelectronics, MIEL

作者： A.D. Rakic M.L. Majewski A.B. Djurlsic E.H. Li J.M. Elazar The Department of Computer Sciance and Elcctrical Engineering University of Queensland Brisbane QLD Australia The Department of EEE University of Hong Kong Hong Kong China The Faculty of Elaetrical of Electrical Engineering University of Belgrade Belgrade Serbia

In this paper we develop expressions for the design of asymmetric, graded interface DBR mirrors by using the concept of characteristic matrices. This rigorous approach allowed for accurate solution of the wave equation (in both homogeneous and inhomogeneous layers) without any approximation. We investigate the two types of graded interface DBR mirrors for Vertical-Cavity Surface-Emitting Lasers: all-semiconductor DBR and oxide-semiconductor DBR. The advantages of using the wide bandwidth, flat phase oxide-semiconductor DBR mirrors over the all-semiconductor DBR mirrors have been presented.

关键词： Bandwidth distributed Bragg reflectors Mirrors Vertical cavity surface emitting lasers Optical films Partial differential equations Optical computing Surface emitting lasers Fabrication Oxidation

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Web-based decision support and telemonitoring system for the management of diabetes

Web-based decision support and telemonitoring system for the...

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： A. Roudsari S. Zhao E. Carson

Summary form only given. We have developed two prototype diabetic computer systems, supporting home data analysis and therapy recommendations for the individual patient, which aim to match the iterative practices of the medical profession and the patient's medical needs. Advanced methods of time series analysis are used to extract patterns and interpret abrupt changes in the patterns from home data. The first system focuses on visit-by-visit adjustments, based on the whole dataset collected between clinic visits; essentially a prototype for a physician assistant to be implemented as part of a diabetes management system with distributed intelligence. The second, evolved from the first, incorporates recent technological advances to extend it to a Web-based system. It provides day-to-day management support, access to electronic diabetes records for end-users, and real-time information for healthcare professionals to facilitate their decision-making. It integrates a portable glucometer, handheld computer, mobile phone and Internet access as a combined telecommunication and mobile computing solution for diabetes management. This system introduces an innovative online diabetes management concept, for example, online appointment and consultation, enabling users to access diabetes management information without time and location limitation and security concerns.

关键词： Diabetes Prototypes Handheld computers Innovation management Home computing Data analysis Medical treatment Pattern analysis Time series analysis Data mining

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A physiological system simulation environment based on knowledge networking

A physiological system simulation environment based on knowl...

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Bei Gu H.H. Asada Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA USA

ISBN: (纸本)0780364651

A new approach is proposed for the simulation of interacting human physiological subsystems. The new simulation environment will allow users to build, analyze and solve a coupled physiological system model with distributed subsystem models. The subsystem models as an abstract form of physiological knowledge are shared through the Internet. The simulation knowledge network includes a distributed model database, an information server, and an analysis and solution environment that will be downloaded from the server. To represent the coupled system, the authors use Differential Algebraic Equations (DAE) as the basic format. There are three common sources of DAEs in modeling of physiological systems. They are causal conflict, simulation optimization, and multistage processes. The singularly perturbed sliding manifold method is chosen for solving DAEs. Possible future improvements are discussed.

关键词： Biological system modeling Biomedical monitoring Humans Computational modeling Network servers Analytical models Medical simulation Coupled mode analysis Internet distributed databases

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A quality assurance phantom for IMRT dose verification

A quality assurance phantom for IMRT dose verification

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： C.-M. Ma S.B. Jiang T. Pawlicki Y. Chen J.S. Li J. Deng M.C. Lee A.L. Boyer Stanford University Stanford CA US

We have investigated a quality assurance (QA) phantom that was specially designed to verify the accuracy of dose distributions calculated by a commercial inverse planning optimization system (CORVUS) and by the Monte Carlo method for intensity-modulated radiotherapy (IMRT). The QA phantom is a PMMA cylinder of 30 cm diameter and 40 cm length with various bone and lung inserts. A procedure was developed to measure the absolute dose at any point inside the QA phantom. Another cylindrical phantom of the same dimensions, but made of water, was used to confirm the results obtained with the PMMA phantom. The PMMA phantom was irradiated by 4, 6 and 15 MV photon beams and the dose was measured using an ionization chamber and compared to the results calculated by CORVUS and by the Monte Carlo method. The results show that the dose distributions calculated by both CORVUS and Monte Carlo agreed well (within 2% of dose maximum) with measured results in the uniform PMMA phantom for both open and intensity-modulated fields. Similar agreement was obtained between Monte Carlo calculation and measured results with the bone and lung heterogeneities inside the PMMA phantom. Following the positive results of this study, our QA phantom has been integrated as a routine QA procedure for patient's IMRT dose verification at Stanford since 1999.

关键词： Quality assurance Imaging phantoms Medical treatment Monte Carlo methods Bones Electromagnetic scattering Particle scattering distributed computing Uncertainty Rotation measurement

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Using MLCs to deliver compensated fields

Using MLCs to deliver compensated fields

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： M.P. West L.C. Jones Department of Radiation Oncology Liverpool Hospital Liverpool Australia

ISBN: (纸本)0780364651

The use of physical compensators to attenuate radiotherapy treatment beams to account for tissue irregularities is a traditional technique which be time consuming and costly. In work, a technique for determining multileaf collimator shaped radiation fields to achieve the same tissue compensation effect as for physical compensators was developed with a view to minimising preparation and treatment time. Results show dose distributions calculated on the authors' treatment planning system for physical and multileaf collimator compensation techniques to be in good agreement. The clinical implementation of this technique will depend on the efficiency of MLC field delivery available.

关键词： Imaging phantoms Collimators Intensity modulation Planing Toxic chemicals Surface treatment distributed computing Computer graphics Matrix converters Breast

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A multi-modal approach to radiotherapy treatment planning optimization

A multi-modal approach to radiotherapy treatment planning op...

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Annual international conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Chong Jen Lim S.U. Ahmad A.R. Leyman Meng Hwa Er Division of Information Engineering School of Electrical & El&tronic Engineering Nanyang Technological University Singapore

ISBN: (纸本)0780364651

The motivation of this paper is to propose a new approach to Conformal RTP using a combination of two techniques of different nature-analytic and stochastic. The authors apply the Least Squares Method together with the new Structured Genetic Algorithm to obtain the optimum beam parameters that will produce the desired dose distribution. While each technique has its inherent advantages and disadvantages, the authors hope to harness the advantages of both techniques through such a multi-modal approach.

关键词： Stochastic processes Genetic algorithms Intensity modulation Least squares methods Optical modulation Erbium Optimization methods Neoplasms Computer errors distributed computing

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