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Automatic Generation of Canonical Views for CAD Models

Automatic Generation of Canonical Views for CAD Models

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IEEE international conference on computer-aided design and computer graphics

作者： Kaimo Hu Bin Wang Bin Yuan Junhai Yong Key Laboratory for Information System Security Ministry of Education Beijing China Department of Computer Science and Technology Tsinghua University Beijing China School of Software Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China

Selecting the best views for 3D objects is useful for many applications. However, with the existing methods applied in CAD models, the results neither exhibit the 3D structures of the models fairly nor conform to human's browsing habits. In this paper, we present a robust method to generate the canonical views of CAD models, and the above problem is solved by considering the geometry and visual salient features simultaneously. We first demonstrate that for a CAD model, the three coordinate axes can be approximately determined by the scaled normals of its faces, such that the pose can be robustly normalized. A graph-based algorithm is also designed to accelerate the searching process. then, a convex hull based method is applied to infer the upright orientation. Finally, four isometric views are selected as candidates, and the one whose depth image owns the most visual features is selected. Experiments on the Engineering Shape Benchmark (ESB) show that the views generated by our method are pleasant, informative and representative. We also apply our method in the calculation of model rectilinearity, and the results demonstrate its high performance.

关键词： Solid modeling design automation Mathematical model Visualization three dimensional displays Equations Computational modeling

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Finite Element Mesh Editing through CAD Operations

Finite Element Mesh Editing through CAD Operations

引用

IEEE international conference on computer-aided design and computer graphics

作者： Hua Zhu Chenghao Hu Shuming Gao State Key Laboratory of CAD&CG Zhejiang University Hangzhou China

In the process of numerical simulation, Finite Element Analysis (FEA) is commonly used for product design optimization. the product model has to be modified according to its associated optimization result obtained based on analysis, and the mesh model needs to be regenerated for analysis to verify the modification. In order to reduce the time for mesh regeneration, one effective way is to directly edit the mesh model according to the modification requirements. In this paper, we present a novel mesh editing method for FE mesh models. the approach achieves the complex and accurate modification on FE mesh models through CAD operations and limits the remeshing to the modified region of the whole mesh model so as to make the approach efficient. Firstly, sweeping operation and Boolean operation are used to construct the new geometry on the mesh model according to the modification requirements, taking the mesh elements as the reference of the operations. then, mesh geometry fusion is conducted, making the related mesh elements aligned with the intersection lines between the original mesh model and the newly added geometry through node repositioning. Finally, mesh elements for the newly added geometry are generated and optimized. Compared with traditional mesh editing methods, the proposed approach can achieve complex editing of FE mesh model more effectively and efficiently. And the preliminary experimental results show the potentials of the proposed approach.

关键词： Solid modeling Geometry design automation Vectors Mesh generation Computational modeling Optimization

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Planar Vertical Jumping Simulation-A Pilot Study

Planar Vertical Jumping Simulation-A Pilot Study

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3rd international conference on Digital Human Modeling(ICDHM)/14th international conference on Human-computer Interaction (HCI)

作者： Ozsoy, Burak Yang, Jingzhou (James) Texas Tech Univ Human Centr Design Res Lab Dept Mech Engn Lubbock TX 79409 USA

ISBN: (纸本)9783642217982;9783642217999

Vertical jumping is one of the fundamental motions among other jumping types in sport biomechanics. Two important criteria in sport biomechanics are critical to all athletes: Injury and performance. In literature two major approaches have been investigated: experiment-based methods and optimization-based methods. Experiment-based methods are time consuming and tedious. Optimization-based methods for musculoskeletal models are computationally expensive because their models include all muscles and explicit integration of equation of motion. In this pilot study, a direct optimization-based method for a skeletal model was proposed in sagittal plane, where this formulation was based on joint space that was only considered the resultant results of muscles (joint torques) instead of individual muscles to reduce computational time. the cost function included increasing the center of mass velocity at take-off and increasing the center of mass position at take-off. Constraints included joint limits, torque limits, initial posture, ground contact, initial angular velocity and acceleration, zero-ground reaction forces, and moment at take-off. this optimization problem was solved by a commercial optimization solver SNOPT and the CPU time was 227 seconds on a regular PC (Intel(R) Core(R) 2 duo CPU, 3.16 GHZ and 3.25 GB RAM). Preliminary results highly correlated results from the literature. this simple planar simulation is the first step to understand the cause and effect for vertical jumping with or without arm swing.

关键词： Vertical jumping planar model injury performance arm swing

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Usability analysis of website with unconventional layout

Usability analysis of website with unconventional layout

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14th international conference on Human-computer Interaction, HCI international 2011

作者： Chang, Ro-Han Su, Ying-Ya Department of Commercial Design Chung Yuan Christian University No.200 Zhongbei Rd. Zhongli City Taoyuan County 320 Taiwan

ISBN: (纸本)9783642220975

It is a vision that internet bandwidth will continue to expand and there is more and more interactive multimedia being applied to websites. When users browse the website quickly, they only remember the unique characteristics of the website. However, a lot of research on web design has been conducted, yet there is no new research on the technique and usability of website with unconventional layouts. When users browse a website, they may feel frustrated with the complicated content and structure. therefore, it is a challenge to create an innovative website with fine usability. this proposal will not only analyze the technique of the innovative website with unconventional layout, but also focus on the usability. the proposal is as follows: (a.) Catalogue the technique and focus on the style from the innovative website with unconventional layout. (b.) Analyze the usability of website with unconventional layouts. (c.) Generate and discuss the feedback from the users in regards to how they feel after browsing. Basically, the research is to be conducted by studying the recorded document theories, interviewing experts, focusing on certain website users, and other results. After this research is conducted, generalizing the principle of the website with unconventional layouts will take place. the result will be referred to by future web designers working in industries where such information will be of value to them. © 2011 Springer-Verlag.

关键词： Web design

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CECOS: A Chinese-English code-switching speech database

CECOS: A Chinese-English code-switching speech database

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14th Annual international conference on Speech Database and Assessments, Oriental COCOSDA 2011

作者： Shen, Han-Ping Wu, Chung-Hsien Yang, Yan-Ting Hsu, Chun-Shan Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9781457709319

With the increase on the demands for code-switching automatic speech recognition (ASR), the design and development of a code-switching speech database becomes highly desirable. However, it is not easy to collect sufficient code-switched utterances for model training for code-switching ASR. this study presents the procedure and experience for the design and development of a Chinese-English COde-switching Speech database (CECOS). Two different methods for collecting Chinese-English code-switched utterances are employed in this work. the applications of the collected database are also introduced. the CECOS database not only contains the speech data with code-switch properties but also accents due to non-native speakers. this database can be applied to several applications, such as code-switching speech recognition, language identification, named entity detection, etc. © 2011 IEEE.

关键词： Database systems

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Creating Cylindrical Panoramic Mosaic from a Pipeline Video

Creating Cylindrical Panoramic Mosaic from a Pipeline Video

引用

IEEE international conference on computer-aided design and computer graphics

作者： Chuan Niu Fan Zhong Songhua Xu Chenglei Yang Xueying Qin School of Computer Science and Technology Shandong Provincial Key Laboratory of Software Engineering Shandong University Jinan China Oak Ridge National Laboratory Oak Ridge TN USA

In geological engineering, stratum structure detection is a fundamental problem in project planning and implementation. One of the most commonly employed detection technologies is to take videos of borehole using a forward moving camera. Following this approach, the problem of stratum structure detection is transformed into the problem of constructing a panoramic image from the taken video sequences, which are typically in low quality. In this paper, we propose a novel method to create a panoramic image of the borehole from the video sequence without camera calibration and tracking. To stitch together pixels of neighboring frame images, our camera model is designed with a focal length changing feature, along with a small rotation freedom in the two-dimensional image space. Essentially, our camera model assumes target objects lie on a cylindrical wall and the camera moves forward along the central axis of the cylindrical wall. Our method robustly resolves these two degrees-of-freedoms through KLT feature tracking and constructs a panoramic image by stitching strips. Experiment results show that our method could efficiently generate high-quality panoramas for very long video sequences.

关键词： Cameras Strips Video sequences Solid modeling Geology Optical imaging Optical distortion

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An end user and environment field study for an inclusive design of consumer products

An end user and environment field study for an inclusive des...

引用

14th international conference on Human-computer Interaction, HCI international 2011

作者： Fiddian, thomas Bowden, Chris Magennis, Mark Fennell, Antoinette Connor, Joshue O’ Kirisci, Pierre T. Mohamad, Yehya Lawo, Michael Featherstone Street 19-23 LondonEC1Y 8SL United Kingdom United Kingdom United Kingdom Universität Bremen United Kingdom

ISBN: (纸本)9783642216183

In this paper an approach to improve the design of every day consumer products for inclusive design with a focus on elderly people with mild to medium physical and sensory impairments is presented. As mainstream manufactures do not have a detailed understanding of the needs of this target group the idea is to use a Virtual Human Model that covers these impairments. A Virtual Laboratory with three design phases is the approach to allow designers to plan and evaluate the user interfaces of their products. the paper gives a state of the art and presents the Virtual User Model as a mixture of human and environment context. In this paper we present results of an detailed ethnographic study. the research carried out on a group of 58 elderly people from the UK, Ireland and Germany who had a range of three mild-to-medium impairments;hearing, vision and manual dexterity. © 2011, Springer-Verlag Berlin Heidelberg.

关键词： Audition

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Memory makers - the experience of camera usage by women

Memory makers - The experience of camera usage by women

引用

14th international conference on Human-computer Interaction, HCI international 2011

作者： Kao, Yu-Lung Wong, Ju-Joan Department and Graduated Institution of Industrial Design College of Management Chang Gung University 259 Wen-Hwa 1st Road Kwei-Shan Tao-Yuan 333 Taiwan Department and Graduated Institution of Industrial Design College of Design National Yunlin University of Science and Technology 123 University Road Douliou Yunlin 64002 Taiwan

ISBN: (纸本)9783642220975

this study focuses on gender perspective to explore the Taiwan married women's experience in using the camera. Unlike Western women who dominate the family photography for a long time, early family photography in Taiwan is mainly responsible by the male. Until the early '80s women had more shooting opportunities. In this study, through the interview to seven of Taiwan's middle-class women's camera usage, we focused on the impact of experience in photography for their lives. Preliminary study results indicated that: In addition to her husband's busy and rejection of photography etc. factors, women's self independent and outgoing nature make them more interested in photography. In addition, due to the computer knowledge they obtained through work and other interests, these women could be more initiatively to adopt digital photography, but they also reduced the chance to actually interact with people. According to the above, the study believes in the late industrialization countries, women are not always passive technology users, but are able to use technology to show themselves;and the future of technology in the development of photography should take a fresh look at women's ability to operate the technology, and to derive self-empowerment of each interacting process. © 2011 Springer-Verlag.

关键词： Cameras

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Fundamental Approaches to Software Engineering - 14th international conference, FASE 2011, Held as Part of the Joint European conferences on theory and Practice of Software, ETAPS 2011, Proceedings

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14th international conference on Fundamental Approaches to Software Engineering, FASE 2011, Held as Part of the Joint European conferences on theory and Practice of Software, ETAPS 2011

ISBN: (纸本)9783642198106

the proceedings contain 30 papers. the topics discussed include: the dependability of complex socio-technical systems;automated learning of probabilistic assumptions for compositional reasoning;an interface theory for service-oriented design;rt-inconsistency: a new property for real-time requirements;semantic quality attributes for big-step modelling languages;formalizing and operationalizing industrial standards;modelling non-linear crowd dynamics in bio-PEPA;formalizing and operationalizing industrial standards;modelling non-linear crowd dynamics in bio-PEPA;modeling with plausibility checking: inspecting favorable and critical signs for consistency between control flow and functional behavior;models within models: taming model complexity using the sub-model lattice;a formal resolution strategy for operation-based conflicts in model versioning using graph modifications;and a step-wise approach for integrating QoS throughout software development.

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Template for Website Browsing

Template for Website Browsing

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9th international conference on Engineering Psychology and Cognitive Ergonomics (EPCE) Held as Part of 14th international conference on Human-computer Interaction (HCI)

作者： Fu, Fong-Ling Su, Chiu Hung Natl Chengchi Univ Dept Management Informat Syst Natl 64Sec 2ZhiNan Rd Taipei 11605 Taiwan Hwa Hsia Inst Technol Dept Management Informat Syst Natl New Taipei City Taiwan

ISBN: (纸本)9783642217401;9783642217418

Websites on e-commerce often display large amounts of multi-media and information, creating problems for viewers when locating specific information. this research uses the concepts of template and selective attention to understand the cognitive simplification in finding information and browsing websites. Utilizing content analysis with 240 university students as subjects, we conducted an experiment on information retention with browsing a shopping website. Although the amount of information displayed by the website was staggering, the result of the experiment showed that participants applied a template built up through past experiences of what's important and where things belong. this internal map containing three mechanisms: segmentation, grouping and attention, is then used to create an efficient task strategy, to segment the page, and to categorize the information. this research tried to understand the attributes of template for users who are browsing Websites. the "findability" of online information would be improved if the arrangement of information of a web site were the same as what viewers expected.

关键词： Information search ability selective attention interface design of websites template matching

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