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9.2.3 Architecting Synthetic Environments to Support the Systems engineering of Capability

INCOSE International symposium 2006年第1期16卷 1285-1293页

作者： Battersby, David BAE Systems SEIC Loughborough University England LeicestershireLE11 3TU United Kingdom

Validating the link between an architecture framework representation of a capability and the systems which provide that capability is a substantial challenge. Synthetic environments are suggested as a method whereby this can be achieved. A traceable method for supporting this is provided through the mapping between architecture framework views, synthetic environments and the design lifecycle. The use of synthetic environments is also highlighted as a key method for the management of capability, through the ability to integrate human factors, process and technical issues. An iterative use of synthetic environments, with increasing levels of modeling fidelity, is suggested as an approach to supporting engineering and acquisition throughout the whole project lifecycle. © 2006 The Authors.

关键词： Iterative methods

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Application of Maximum Entropy-Based Image Resizing to Biomedical Imaging

Application of Maximum Entropy-Based Image Resizing to Biome...

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Annual IEEE symposium on Computer-Based Medical Systems

作者： P.B. Kao B. Nutter Department of Electrical and Computer Engineering Texas Tech University USA

Subsampling algorithms are applied to resize digital images to a lower resolution for display and transmission applications where the pixel count of the display mechanism is lower than the pixel count of the image acquisition method. Unfortunately, interpolation-based resizing methods change the color information and attenuate a specific range of high-frequency components from which the human visual system derives significant response. The described maximum entropy algorithm (MEA) provides that, as an image goes through subsampling, locally informative pixels are retained by analyzing the pixel neighboringhoods. The selected pixels are inserted directly in the output image, and color information is therefore preserved. From subjective observation and object evaluation using the entropy, contrast, and PSNR, MEA effectively maintains important features and color information and demonstrates better resizing performance than interpolation-based methods for some applications. Furthermore, the computational expense is suitable for real-time implementation

关键词： Biomedical imaging Pixel Displays Entropy digital images Image resolution humans Visual system Image analysis Algorithm design and analysis

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Primary Study on MAS-based Single-Species Ecosystem Model

Primary Study on MAS-based Single-Species Ecosystem Model

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International Conference on Pervasive Computing and Applications (ICPCA)

作者： J. Chen H. Liu X. Zhang School of Information Science and Engineering Shandong Normal University Jinan China Information Management College Shandong Economics University Jinan China

Simulating based on multi-agent system (MAS) is a new research tool for the order of nature, especially for ecosystem and life-form evolvement. This paper put forward a MAS-based single-species life-form ecosystem model to simulate evolvement of ecosystem. With the model, we can study on a set of social problems which exist in single-species society, such as how environment affects individual belief; concerned with certain individual ability level, what optimal scale of cooperating group is; what about the relationship between individual size and its adaptability. The zoological society has certain similarity to human society, so study on these problems can help us to interpret society of ourselves. Further, homothetic case also exists in many other situation, such as virus spread, enterprise competition. This nonobjective model can be utilized in broad application fields

关键词： Ecosystems Computational modeling Multiagent systems Power system modeling Pervasive computing humans Educational institutions Earth Observing System Algorithm design and analysis Data analysis

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A Pattern-driven Development Process for Quality Standard-conforming Business Process Models

A Pattern-driven Development Process for Quality Standard-co...

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IEEE symposium on Visual Languages and human Centric Computing (VL/HCC)

作者： A. Forster G. Engels T. Schattkowsky R. Van Der Straeten University of Paderborn Germany Vrije Universiteit Brussel Belgium

Quality management is a hot issue in most organisations and must be considered in the business processes of the organisation. Existing approaches on business process modelling provide neither explicit strategy to model quality requirements on business processes nor do they provide explicit support for the construction of business processes satisfying such quality requirements. In this paper, we present a pattern-driven development process for modelling business processes with respect to given quality constraints. We introduce a visual pattern specification language based on UML Activity Diagrams that enables the expression of quality constraints as patterns. These patterns can be used in a forward-engineering development process which supports the business process designer in constructing business processes by applying patterns. Thereby, quality constraints can be integrated into the design of business processes seamlessly

关键词： Quality management Process design Unified modeling language ISO standards Total quality management Specification languages Natural languages humans Contracts Domain specific languages

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3D FEM Model for Localised SAR Estimate in human Exposure to Microwaves

3D FEM Model for Localised SAR Estimate in Human Exposure to...

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EMC Europe 2006 Barcelona, International symposium on Electromagnetic Compatibility

作者： Mihaela Morega Al. M. Morega Alina Machedon Department of Electrical Engineering POLITEHNICA University of Bucharest 313 Splaiul Independentei zip code 06004 Bucharest Romania

ISBN: (纸本)8468994383

Exposure of living bodies to very high frequency non-ionizing electromagnetic field (EMF) (i.e. microwave (MW) domain, (10 8 - 10 11 ) Hz) is associated to the use of mobile communications, radar detection, dielectric heaters and to several medical procedures. Phantoms filled with artificial materials described by dielectric properties similar to those of anatomical tissues are used in experimental procedures for electronic equipment certification; numerical modeling is also a powerful tool for EMF distribution and dosimetric parameters evaluation, while an optimum between computational costs and relevance of results is desirable. We report here a numerical study of the electromagnetic field induced in several biological 3D FEM models by a conventional microwave applicator. The sensitivity of dosimetric parameters relative to the properties of the model and the compliance with exposure guidelines are evaluated. The influence of dielectric properties dispersion on dosimetric quantities is examined. Useful conclusions were drawn for the design and validation of experimental settings and numerical models. The general characteristics of the MW source and the exposed medium are associated to mobile telephony conditions, but the methods could be also extended to other applications.

关键词： Computational modeling Three-dimensional displays Solid modeling Mathematical models Numerical models Magnetic heads Head Finite element analysis Dielectrics Shape

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design of a Compact System Using a MEMS Accelerometer to Measure Body Posture and Ambulation

Design of a Compact System Using a MEMS Accelerometer to Mea...

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Annual IEEE symposium on Computer-Based Medical Systems

作者： K.E. Bliley D.J. Schwab D.R. Holmes P.H. Kane J.A. Levine E.S. Daniel B.K. Gilbert Department of Physiology and Biomedical Engineering Mayo Clinic College of Medicine Rochester MN USA

Interest in studying human posture, movement, and physical activity is growing due in part to the increasing prevalence of obesity. Accelerometers are commonly used in motion analysis systems to enable researchers to conduct studies outside of the traditional laboratory environment; however the available systems tend to be bulky and unsuitable for long-term studies. Therefore, a need exists for a physically robust, yet compact motion analysis system that can be easily worn for an extended time period without disrupting the person's range of motion. Here we describe our on-going efforts to develop a robust, compact system that can measure body posture and movement using a tri-axial accelerometer, and then store this data on a secure digital memory card. This device can be easily configured to collect accelerometer data for specific applications in human motion analysis. In the future, this device will be used to study physical activity in free-living individuals

关键词： Micromechanical devices Accelerometers Motion analysis Robustness humans Biomedical measurements Microcontrollers Instruments Programming Physiology

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High Fidelity Haptic Rendering 1

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丛书名： Synthesis Lectures on Computer Graphics and Animation

2006年

作者： Otaduy, Miguel A. Lin, Ming C.

ISBN: (数字)9781598291155

ISBN: (纸本)9781598291148

The human haptic system, among all senses, provides unique and bidirectional communication between humans and their physical environment. Yet, to date, most human-computer interactive systems have focused primarily on the graphical rendering of visual information and, to a lesser extent, on the display of auditory information. Extending the frontier of visual computing, haptic interfaces, or force feedback devices, have the potential to increase the quality of human-computer interaction by accommodating the sense of touch. They provide an attractive augmentation to visual display and enhance the level of understanding of complex data sets. They have been effectively used for a number of applications including molecular docking, manipulation of nano-materials, surgical training, virtual prototyping, and digital sculpting. Compared with visual and auditory display, haptic rendering has extremely demanding computational requirements. In order to maintain a stable system while displaying smooth and realistic forces and torques, high haptic update rates in the range of 500-1000 Hz or more are typically used. Haptics present many new challenges to researchers and developers in computer graphics and interactive techniques. Some of the critical issues include the development of novel data structures to encode shape and material properties, as well as new techniques for geometry processing, data analysis, physical modeling, and haptic visualization. This synthesis examines some of the latest developments on haptic rendering, while looking forward to exciting future research in this area. It presents novel haptic rendering algorithms that take advantage of the human haptic sensory modality. Specifically it discusses different rendering techniques for various geometric representations (e.g. point-based, polygonal, multiresolution, distance fields, etc), as well as textured surfaces. It also shows how psychophysics of touch can provide the foundational design guidelines for d

关键词： Technology engineering

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6A-3 Pure Shear Horizontal SAW Network Model for Periodic Structures Including Bulk Scattering

6A-3 Pure Shear Horizontal SAW Network Model for Periodic St...

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IEEE symposium (IUS) Ultrasonics

作者： T. B. Pollard M. P. da Cunha Department of Electrical and Computer Engineering and Laboratory for Surface Science and Technology University of Maine Orono ME USA

Rigorous simulations using combined finite/boundary element methods (FEM/BEM) are often too time consuming for the rapid evaluation of long surface-acoustic wave (SAW) structures, and soon become impractical as device length increases. This situation is complicated by the need of subsequent design modifications and analyses. Scalar models, and in particular, transmission line (TL) based network descriptions, enable fast evaluation of arbitrary device topologies comprised of inter digital-transducers (IDTs) and reflector/grating structures. For example, simulating a resonator structure using a network model reduces computation time from days or hours to minutes, allowing the identification of optimal designs, which may then be further analyzed using rigorous FEM/BEM techniques. The traditional network model (NM) consists of mismatched TLs, shunt susceptances, and transformers, and has been successfully used to simulate transduction and propagation of pure Rayleigh type and generalized SAWs in periodic structures. In these cases, it is often acceptable to neglect bulk acoustic wave (BAW) radiation, since the operational frequencies of the SAW devices are far away from the BAW radiation frequency. However, in the case of pure shear horizontal (SH) SAW orientations significant BAW scattering is frequently observed because the BAW radiation frequency takes place near the SAW bandwidth, and thus the traditional NM fails to account for the energy radiated to the bulk. In this work a modification of the traditional NM is introduced that accounts for energy loss near the upper stopband edge for a long periodic structure, thus allowing the use of the NM to adequately simulate structures along pure SH SAW orientations. The BAW radiation is modeled by a frequency-dependent shunt conductance located at electrode edge discontinuities. A parameter extraction technique is presented that allows the rapid determination of frequency-dependent parameters. In particular, the parameters

关键词： Surface acoustic waves Periodic structures Frequency Computational modeling Acoustic scattering Rayleigh scattering Surface acoustic wave devices Boundary element methods Surface waves Transmission lines

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安阳殷墟博物苑虚拟重建三维系统

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计算机工程与设计 2006年第16期27卷 3108-3110页

作者：段新昱刘晨曦安阳师范学院计算机科学系河南安阳455000

使用多媒体、虚拟网络技术对安阳殷墟博物苑及其出土文物、雕塑进行了三维重建,所搭建的系统可用于数字考古以及虚拟探游的三维实现。应用技术主要有大规模场景以及精细物体的三维建模技术,包括基于手工测绘数据、基于三维扫描仪以及基... 详细信息

使用多媒体、虚拟网络技术对安阳殷墟博物苑及其出土文物、雕塑进行了三维重建,所搭建的系统可用于数字考古以及虚拟探游的三维实现。应用技术主要有大规模场景以及精细物体的三维建模技术,包括基于手工测绘数据、基于三维扫描仪以及基于立体像对的建模技术;虚拟探游技术,包括虚拟人技术以及虚拟动画技术;虚拟多媒体技术,包括虚拟音、视频技术以及虚拟信息自动触发技术。通过网络,用户即可实时对殷墟博物苑进行全方位、360°全视角的三维虚拟探游。

关键词：殷墟博物苑数字化研究立体像对三维重建虚拟探游

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Special Issue on Shape and Solid modeling in product development

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JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN engineering 2005年第2期5卷 77-78页

作者： Brunet, P Elber, G Patrikalakis, NM Giannini, F Pasko, A UPC Barcelona Spain Technion Israel Inst Technol Haifa Israel MIT Cambridge MA 02139 USA CNR Genoa Italy Hosei Univ Tokyo Japan

This Special Issue of JCISE includes selected papers that were presented at the IEEE Shape modeling International Conference (SMI’04) and the Ninth ACM symposium on Solid modeling and Applications (SM’04). The conferences were colocated at the Palazzo Ducale, in the historic center of Genoa, Italy in June 2004 as part of the International Convention on Shapes & Solids 2004 organized and chaired by Bianca Falcidieno (CNR, Italy). The Shape modeling International Conference is an annual international forum for the exchange of research and applications related to all the aspects dealing with modeling, representing, processing and retrieving of digital shapes and associated properties from a broad multidisciplinary perspective. The ACM symposium on Solid modeling and Applications is also an annual international forum for the exchange of recent research and applications of solid modeling and computing in design, analysis and manufacturing, as well...

关键词： product development Shapes Computer-aided design Product development CAD Solid modeling solid modelling

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