检索结果-内蒙古大学图书馆

2012 5th International Conference on Biomedical Engineering and Informatics, BMEI 2012

作者： Liang, Chen Yan, Li Fang, Pu Yang, Yang Shuyu, Li Deyu, Li Yubo, Fan Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China Research Institute of Beihang University in Shenzhen Shenzhen 518057 China

ISBN: (纸本)9781467311816

The binocular disparity is the prime of forming stereopsis. The researches were not focused on basic visual functional areas affecting stereoscopic perception induced by binocular disparity. In this paper, ERP technology was used to study the regulatory region in cerebral cortex which relates to stereoscopic perception induced by binocular disparity. We chose eight subjects to conduct the experiment by using images with different binocular disparities, and we found the stereoscopic perception resulted from binocular disparity evoked N2 wave on all of occipital lobe with large amplitude at 180ms. In addition, the amplitudes of N2 waves in the O channels were lower than those of other channels. It means the regulation of stereoscopic perception induced by binocular disparity needs basic and advanced visual functional areas work together. Meanwhile, it also means the principle areas are the advanced visual functional areas. © 2012 IEEE.

关键词： Stereo image processing

来源：评论

学校读者我要写书评

暂无评论

A software to generate finite element meshes for patient-specific denture

A software to generate finite element meshes for patient-spe...

引用

2012 5th International Conference on Biomedical Engineering and Informatics, BMEI 2012

作者： Hao, Chenru Cai, Zhen Han, Bing Zhang, Mingzheng Li, Yan Pu, Fang Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100191 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China Research Institute of Beihang University in Shenzhen Shenzhen 518057 China

ISBN: (纸本)9781467311816

Finite element modeling has been widely used in theoretical study of orthodontic biomechanics. However, the dental structure is complicate and it is time-consuming for traditional finite element meshes method. This restricts the application of finite element analysis of individual orthodontic treatment in clinic. In this paper, a novel software is developed, which includes the functions of semi-automatic teeth segmentation of patient-specific denture, 3D reconstruction and visualization of dental structure, 3D measurement of geometrical characteristics, simulation of tooth movement, and automatic generation of finite element meshes. This software may be used for patient-specific biomechanical analysis in orthodontics. © 2012 IEEE.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Real-time rendering of massive aircraft model for assembly

引用

Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics 2012年第5期24卷 590-597页

作者： Tan, Dunming Zhao, Gang State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China The First Institute of PLA Air Force Xinyang 464000 China School of Mechanic Engineering and Automation Beihang University Beijing 100191 China

In order to solve real-time rendering of massive aircraft CAD models, automatic batch LOD generation and real-time adaptive rendering methods are presented. By the methods, CAD parts are treated as handling targets to keep assembly tree, together with split algorithm to simplify massive model. Then model storage, rendering ability of computer and characteristics of CAD parts are taken into consideration for quantitative LOD generation. LOD levels are adjusted according to rendering load and mesh density based on accurate occlusion query, so the accuracies and errors among different parts are consistent, which also avoid drawbacks of traditional methods. Finally the methods are optimized for speed. The experimental results show that massive CAD model with tens of millions triangles can be finished LOD generation within one hour and rendered in real-time on personal computers.

关键词： Computer aided design

来源：评论

学校读者我要写书评

暂无评论

GPU based evaluation and LOD rendering of NURBS surfaces

引用

Computer-Aided Design and Applications 2012年第5期9卷 707-719页

作者： Dunming, Tan Gang, Zhao Hu, Lu State Key Laboratory of Virtual Reality Technology and Systems Beihang University China The First Aeronautical Institute of PLA Air Force China Shanghai Aircraft Manufacturing CO. Ltd China

This paper proposes a new GPU method for the evaluation and LOD (Level of Detail) rendering of NURBS surfaces. Compared with the existing evaluation method of basis function, the approach simplifies the process by just one-pass and saves the graphics memory with only one texture array. The wavelet based LOD rendering method also saves the time to re-evaluate and re-transfer the data for rendering. © 2012 CAD Solutions, LLC.

关键词： Graphics processing unit

来源：评论

学校读者我要写书评

暂无评论

Six-degree-of-freedom haptic simulation of organ deformation in dental operations

Six-degree-of-freedom haptic simulation of organ deformation...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Dangxiao Wang Shuai Liu Xin Zhang Yuru Zhang Jing Xiao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Department of Computer Science University of North Carolina Charlotte USA

Six-degree-of-freedom (6-DOF) haptic rendering is challenging when multi-region contacts occur between the graphic avatar of a haptic tool operated by a human user, which we call the graphic tool, and deformable objects. In this paper, we introduce a novel approach for deformation modeling based on a spring-sphere tree representation of deformable objects and a configuration-based constrained optimization method for determining the 6-dimensional configuration of the graphic tool and the contact force/torque response to the tool. This method conducts collision detection, deformation computation, and tool configuration optimization very efficiently based on the spring-sphere tree model, avoids inter-penetration, and maintains stability of haptic display without using virtual coupling. Experiments on typical dental operations are carried out to validate the efficiency and stability of the proposed method. The update rate of the haptic simulation loop is maintained at ~1kHz.

关键词： Optimization Force Torque Couplings

来源：评论

学校读者我要写书评

暂无评论

引用

International Conference on Computer Communications and Networks (ICCCN)

作者： Yuehua Wang Zhong Zhou Ling Liu Liang Cheng Wei Wu State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University China Georgia Institute of Technology College of Computing Georgia Institute of Technology USA Department of Computer Science and Engineering Lehigh University USA

Group communication is essential for multi-user applications. However, due to unpredictable node departures and non-deterministic network partitions, providing reliable and scalable group communication services is challenging when the applications are utilized by the users with heterogeneous capacities on a large scale. To address this challenge, we propose a novel replication scheme to achieve high reliability and low-cost scalability in group communication with following three features. First, it introduces a new concept of replication based on topological similarity, which empowers each node with an ability of measuring similarity between the nodes in topology. By eliminating the topological similarity between the replicas, it intelligently mitigates service interruptions caused by node failures and network partitions. Second, instead of specifying the number of replicas, it provides a technique for nodes to dynamically adapt the replication placement schemes by exploiting functionality importance of the nodes in the group- communication session. It eliminates the bottleneck problem and improves the network resource utilization. Third, the scheme is self-converging and it can stabilize within a few adaptations even facing a high churn rate. Extensive simulations show that it yields significant improvements in reduction of replication overhead and service interruption when comparing to existing approaches.

关键词： Random access memory Topology Maintenance engineering Reliability theory Computer network reliability

来源：评论

学校读者我要写书评

暂无评论

Wrench capability analysis of cable-driven parallel mechanisms

Wrench capability analysis of cable-driven parallel mechanis...

引用

ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2011

作者： Zou, Yu Zhang, Yuru State Key Laboratory of Virtual Reality Technology and Systems Robotics Institute Beihang University Beijing 100191 China

ISBN: (纸本)9780791854839

The maximum wrench capabilities of the cable-driven parallel mechanisms are investigated in this paper. Focusing on accuracy and efficiency, two methods, an optimization-based method and a hybrid method based on optimization and geometry, are presented for determining the wrench capability of the cable-driven parallel mechanisms. Both methods are applied to a 6-DOF cable-driven parallel mechanism with eight cables to compute the maximum isotropic force and maximum isotropic moment. Comparison of the two methods is made. The results show that the hybrid method proposed is more accurate and computationally efficient. Copyright © 2011 by ASME.

关键词： Mechanisms

来源：评论

学校读者我要写书评

暂无评论

Visualizing timelines: Evolutionary summarization via iterative reinforcement between text and image streams 12

Visualizing timelines: Evolutionary summarization via iterat...

引用

21st ACM International Conference on Information and Knowledge Management, CIKM 2012

作者： Yan, Rui Wan, Xiaojun Lapata, Mirella Zhao, Wayne Xin Cheng, Pu-Jen Li, Xiaoming Dept. of Computer Science and Information Engineering National Taiwan University Taipei 10617 Taiwan Institute of Computer Science and Technology Peking University Beijing 100871 China Institute for Language Cognition and Computation University of Edinburgh Edinburgh EH8 9AB United Kingdom Dept. of Computer Science and Technology Peking University Beijing 10087 China State Key Lab. of Virtual Reality Tech. and Systems Beihang University Beijing 100083 China

ISBN: (纸本)9781450311564

We present a novel graph-based framework for timeline summarization, the task of creating different summaries for different timestamps but for the same topic. Our work extends timeline summarization to a multimodal setting and creates timelines that are both textual and visual. Our approach exploits the fact that news documents are often accompanied by pictures and the two share some common content. Our model optimizes local summary creation and global timeline generation jointly following an iterative approach based on mutual reinforcement and co-ranking. In our algorithm, individual summaries are generated by taking into account the mutual dependencies between sentences and images, and are iteratively refined by considering how they contribute to the global timeline and its coherence. Experiments on real-world datasets show that the timelines produced by our model outperform several competitive baselines both in terms of ROUGE and when assessed by human evaluators. © 2012 ACM.

关键词： Reinforcement

来源：评论

学校读者我要写书评

暂无评论

Bionics analysis of equipment self-healing

Bionics analysis of equipment self-healing

引用

International Conference on Reliability, Maintainability and Safety

作者： Ding, Yan Kang, Le Wang, Meihui Lv, Chuan State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781612846644

Applying the theory of Bionics, this article explores the meaning of equipment self-healing deeply by contrasting the sub-health condition of human being, and analyzes the self-healing mechanism of equipment through investigating the theory of human self-recovery. According with integrative design methods, this article proposes a new method to develop the primary equipment and the self-healing system synchronously. This paper provides the foundation of developing self-healing technology in different fields. © 2011 IEEE.

关键词： Bionics

来源：评论

学校读者我要写书评

暂无评论

Integrating boundary cue with superpixel for image segmentation

Integrating boundary cue with superpixel for image segmentat...

引用

International Conference on Image and Graphics

作者： Sun, Linjia Liang, Xiaohui State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769545417

This paper researches image segmentation as a global optimization problem and proposes a new way, which is called superpixel status model, to integrate boundary and region cue. Superpixel status model is a label model which describes the joint distribution of boundary and region classification in a bayesian framework. For organizing a boundary classifier, the contour of superpixel is decomposed into multiple line segments, and a robust line descriptor is presented to form line feature vector. Finally, an objective function is defined to assemble all superpixels statuses across the entire image for segmentation. Experiments and results show that the effectiveness of our approach. © 2011 IEEE.

关键词： Global optimization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：