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共 192 条记录，以下是151-160 订阅

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Rod-like trabeculae extraction from cancellous bone microstructure using topological analysis

Rod-like trabeculae extraction from cancellous bone microstr...

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IEEE international conference on computer-aided design and computer graphics

作者： Xiaoting Wang Y.K. Choi W.W. Lu Wenping Wang School of Computer Science and Technology Shandong University China The Department of Computer Science University of Hong Kong China The Department of Orthopaedics and Traumatology University of Hong Kong China

The study of the microstructure in cancellous bone is important in osteoporosis research. In this paper, we focus in the extraction of rod-like trabeculae in cancellous bone, whose topological and geometrical properties are known to be strongly related to bone strength. Three dimensional (3D) cancellous bone volume data obtained from micro computed tomography (micro-CT) scans is used in our analysis. Because of the complexity of the cancellous bone microstructure, the mere use of existing 3D digital topology methods is unable to yield satisfactory results for trabeculae extraction. We devise several enhancements which are specific to the identification of rod-like trabeculae. Experimental results show that the accuracy of trabeculae extraction is greatly improved. This application study may help clinicians to solve problems in future.

关键词： Cancellous bone Microstructure Osteoporosis Topology Data mining Surface morphology Image segmentation computer science Computed tomography Mechanical factors

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Diagramming design: Visualizing user interactions with colour palettes

Diagramming design: Visualizing user interactions with colou...

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9th international conference on Information Visualisation

作者： Stones, C Univ Leeds Leeds LS2 9JT W Yorkshire England

ISBN: (纸本)0769523978

This is a partly practical, partly theoretical paper regarding the uses and potential uses of capturing and visualising digital design moves. The paper-based sketch consists Of ambiguous marks that evidence shifts in creative thinking over time. When the artist or designer uses digital technologies to design, only final polished digital marks remain at the end of a session. The processes by which the final design occurred are invisible. This paper presents visualizations of task-based and highly constrained design activities such as colour selection to indicate what can he learned by visualizing mechanical design processes. By visualizing how student designers move across two different designs of colour palette both artistically and empirically interesting results are found. Visualizing design moves enables the design researcher to discover patterns within design behaviour, enables the usability researcher to test interface usage, and enables the designer to create images with aesthetic potential through process alone.

关键词： computer aided design

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Research on pressure component design ontology building based on knowledge sharing and reusing

Research on pressure component design ontology building base...

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international conference on computer Supported Cooperative Work in design

作者： Shiyi Bao Yu Zhou Shuyan He Instirure of Nuclear and New Energy Technology Tsinghua University Beijing China

ISBN: (纸本)184000025

Knowledge sharing and re-using is the base of computer-supported cooperative work (CSCW) for pressure component design which are the key equipments in various industries. The objective of this study is to develop an ontology of pressure component design for sharing and re-using numerous concept knowledge among different domains in the pressure component design process. At first, an iterative ontology building process is presented in the paper according to special characteristics of pressure component design process. Protege-3.0, a knowledge base management system (KBMS), is employed to develop and maintain the ontology. Then, formal concept analysis (FCA) is adopted in the ontology building process to establish the taxonomic hierarchy correctly and properly, because it yields the mathematization of the doctrines of concepts. Finally, the compositions of pressure component ontology are explained briefly.

关键词： Ontologies Buildings Process design Artificial intelligence Collaborative work design automation Testing design engineering graphics Helium

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Differential treatment of Web services-based collaborative applications

Differential treatment of Web services-based collaborative a...

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international conference on computer Supported Cooperative Work in design

作者： I. Awan M. Younas Department of Computing University of Bradford Bradford UK Department of Computing Oxford Brookes University Oxford UK

Current CSCW models give no preferential treatment to the processing of collaborative applications. However, to ensure effective collaboration among large number of diverse and distributed applications, it becomes imperative that some applications should be treated differently than others. This paper proposes a new Web services-based model that enables differentiated treatment of collaborative applications. The proposed model is based on three-layered architecture such that it processes various and diverse in nature collaborative applications. It assigns different grades of services to different collaborative applications. This model provides collaborative applications with better quality of service such as improved performance and prioritised service.

关键词： Collaboration Web services Application software Collaborative work Simple object access protocol XML User interfaces computer aided software engineering Hardware Web and internet services

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Quick-VDR: Out-of-core view-dependent rendering of gigantic models

Quick-VDR: Out-of-core view-dependent rendering of gigantic ...

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ACM SIGGRAPH 2007 - international conference on computer graphics and Interactive Techniques

作者： Yoon, Sung-Eui Salomon, Brian Gayle, Russell Manocha, Dinesh Department of Computer Science Sitterson Hall University of North Carolina-Chapel Hill Chapel Hill NC 27599 United States

We present a novel approach for interactive view-dependent rendering of massive models. Our algorithm combines view-dependent simplification, occlusion culling, and out-of-core rendering. We represent the model as a clustered hierarchy of progressive meshes (CHPM). We use the cluster hierarchy for coarse-grained selective refinement and progressive meshes for fine-grained local refinement. We present an out-of-core algorithm for computation of a CHPM that includes cluster decomposition, hierarchy generation, and simplification. We introduce novel cluster dependencies in the preprocess to generate crack-free, drastic simplifications at runtime. The clusters are used for LOD selection, occlusion culling, and out-of-core rendering. We add a frame of latency to the rendering pipeline to fetch newly visible clusters from the disk and avoid stalls. The CHPM reduces the refinement cost of view-dependent rendering by more than an order of magnitude as compared to a vertex hierarchy. We have implemented our algorithm on a desktop PC. We can render massive CAD, isosurface, and scanned models, consisting of tens or a few hundred million triangles at 15-35 frames per second with little loss in image quality. © 2005.IEEE.

关键词： computer aided design

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Model compression and transmission in collaborative CAD

Model compression and transmission in collaborative CAD

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international conference on computer Supported Cooperative Work in design

作者： Rong-Qin Chen Min Tang Jin-Xiang Dong Shang-Ching Chou College of Computer Science and Technology University of Zhejiang Hangzhou China Department of Computer Science Wichita State University Wichita KS USA

ISBN: (纸本)184000025

CAD systems increasingly require distributed collaborative design capabilities to meet the designers at different geographical locations to co-develop parts. It involves transmitting the CAD models back and forth among the systems in a distributed design environment. However, it is very difficult to apply because the CAD models are always very complex and the current network bandwidth is limited. In this paper, some important work about the compression and transmission of CAD models through the network is elaborated. Meanwhile, because a feature-based model always contains many extruded and revolved features, then we propose a new approach to transmission of feature-based models to deal with these extruded and revolved features. This approach can effectively cut down the transmission delay of the feature-based models, especially when the model contains many extruded and revolved features.

关键词： Collaboration design automation Solid modeling computer science Shape Rendering (computer graphics) Educational institutions Bandwidth Product design Communication effectiveness

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Researches on virtual prototyping presentation model based on directed acyclic graph

Researches on virtual prototyping presentation model based o...

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international conference on computer Supported Cooperative Work in design

作者： Xiaoxi Zheng Guozheng Sun Shaomei Wang Infomarion school wuf University of Jiangmen Guangdong China CAD/CAE & Simulation Center Wuhan University of Technology Wuhan Hubei China

ISBN: (纸本)184000025

The key technique of virtual prototyping is real-time a performance simulation for a product, such as virtual assembly simulation and mechanism movement simulation. However, the key to realize this simulation is yet the representation of a product model, and but, the traditional digital model of a product (such as relation model and hierarchical model) doesn't meet the demand. Therefore, this paper provides a scene graph model of a digital product based on DAG. The definition of the scene graph model is given and the features to represent a virtual product with DAG are analyzed o Finally, the principles of dynamically assembling and disassembling product with DAG and its simulating method are explained with an example.

关键词： Virtual prototyping Assembly Layout Humans computer aided engineering Sun Educational institutions Computational Intelligence Society Kinematics Process planning

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Study on visual design environment of cooperative template

Study on visual design environment of cooperative template

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international conference on computer Supported Cooperative Work in design

作者： Xiao-ping Liu Hui Shi Xue-yuan Chen Zhen-qiang Mao Li-ping Zheng VCC Division School of Computer & Information Hefei University of Technology Hefei China Institute of Plasma Plysics Chinese Academy and Sciences Hefei China

ISBN: (纸本)184000025

Template technology has a great contribution to domain of design, especially computer aided design. Based on existing technologies and methodology, authors have applied the concept of cooperative template to the study of visual design environment. A framework of visual design environment of cooperative template is introduced including cooperative template description, element constraint, working flow and parallel mechanism. Several instances like Die cooperative & Sofa are provided to demonstrate the features and utility of the design environment. As a new concept, result of application makes authors believe that cooperative template play an important role in information-reducing, relation-order and design efficiency in CSCD environment.

关键词： Network-on-a-chip Nuclear and plasma sciences Integrated circuit technology design engineering Programming Image processing computer languages design methodology Pattern matching Pattern recognition

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Applying secret sharing schemes to service reputation

Applying secret sharing schemes to service reputation

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international conference on computer Supported Cooperative Work in design

作者： A.S. Namin Ruizhong Wei Weiming Shen H. Ghenniwa National Research Council Integrated Manufacturing Technologies Institute Canada Department of Computer Science Lakehead University Canada Department of Electrical and Computer Engineering University of Western Ontario Canada

A successful result of choosing, invoking, integrating and composing services in a collaborative environment depends directly on locating reliable services with respect to their performances, histories, feedbacks from their customers, and generally their reputations. Nevertheless, lacking a secure mechanism to create countable reputation information may lead service providers to exaggerate their performances. We propose to apply threshold schemes under the context of service reputation towards providing an unconditionally secure "reputation" credits and systems for services and their providers. We argue that applying such a secure mechanism for reputation of services is not forgeable. As a result, any service requester was able to rely on valuable reputation information and choose the most reliable services with confidence.

关键词： Cryptography Distributed computing Collaboration Context-aware services Lakes Information security Web and internet services Application software Web services computer aided manufacturing

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Enhancing intelligent user assistance in collaborative design environments

Enhancing intelligent user assistance in collaborative desig...

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international conference on computer Supported Cooperative Work in design

作者： Y. Zhang H. Ghenniwa W. Shen Department of Electrical and Computer Engineering University of Western Ontario London ONT Canada Integrated Manufacturing Technologes Institute National Research Council Canada London ONT Canada

This paper presents some results of our ongoing research on enhancing intelligent user assistance in collaborative design environments. The proposed intelligent assistant agent is composed of a user model, an inference component, a knowledge update component, and a collaboration component. The user model is divided into a user interest model and a user behavior model in order to capture the user's interests and user's actions related to the goal separately in the application domain. The detailed design of the user model has been reported previously. This paper focuses on the design and implementation of the collaboration component. It addresses issues on how the intelligent assistant agent reasons on the user interest model and the user behavior model by utilizing the collaboration component to find out the user's potential collaborators, and what collaboration strategy is used to choose a collaborator with the highest utility.

关键词： Intelligent systems Human factors Collaboration Intelligent agent Collaborative work design engineering computer aided manufacturing Human computer interaction Pulp manufacturing Councils

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