检索结果-内蒙古大学图书馆

International Conference on virtual reality and Visualization

作者： Chengyu Guo Songsong Ruan Xiaohui Liang State Key Lab. Of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376747

In this paper, a generic approach is presented to constructing generative motion model from prerecorded motion data that allows the synthesis of new motions or modification of existing motions in various ways. The key idea is to decompose human motion data into a series of latent variables which decompose a number of sports from different properties, in the way motion variations are interpreted by modeling human motion data in the Gaussian process. The effectiveness and flexibility of this approach in experiments and applications are demonstrated by constructing two generative motion models as an example of various kinds of motion properties.

关键词： character animation generative motion models motion editing and synthesis

来源：评论

学校读者我要写书评

暂无评论

Design and implementation of target tracking software Development Environment

Design and implementation of target tracking software Develo...

引用

International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Weihua Liu Yongjia Zhao Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376839

Target tracking software that running on airborne radar is usually developed by hard coding in C language. This method is not efficient, large amount of time and money is spent during the development process. In this paper, we present an integrated development environment for target tracking software, which is Target tracking software Development Environment (TDE). TDE supports the whole process of target tracking software development including design, implementation, testing and assessment. It provides most of the algorithms and function blocks widely used in target tracking software, and enables developers to construct the software in a short time, and then test and verify it in simulation. The example shows that TDE is effective and highly improved the development efficiency.

关键词： Target tracking Radar tracking Software Software algorithms Algorithm design and analysis Object oriented modeling

来源：评论

学校读者我要写书评

暂无评论

Improved Real-time Pedestrian Detection Method

Improved Real-time Pedestrian Detection Method

引用

International Conference on Computer Science and Network technology (ICCSNT)

作者： Zhiming Zhao Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781728133003

With the development of deep learning, algorithm research in object detection has also made significant progress. At present, there are many excellent object detectors, such as Faster R-CNN, SSD, etc. YOLO is one of the most outstanding detectors and has many practical applications in industry. Based on this, we study how to apply it to real-time pedestrian detection, and improve the detection performance. Based on the YOLO algorithm, we mainly carry out the following work: 1). Apply parameterized ReLU as main activation function of network; The classification subnet is separated from the regression subnet, and the parameters are no longer shared between the two subnetworks to improve the network performance; 2). Design loss function to reduce the effect of foreground-background class imbalance caused by anchors, and the classification is improved by hard sample mining. The weight coefficient is designed to improve the localization of the network for small objects. 3). Design the parameters of the anchors to optimize the localization of pedestrian objects.

关键词： Feature extraction Classification algorithms Real-time systems Prediction algorithms Convolution Object detection Detectors

来源：评论

学校读者我要写书评

暂无评论

An efficient algorithm unifying MHT and Multiple Model approaches

An efficient algorithm unifying MHT and Multiple Model appro...

引用

International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Weihua Liu Yongjia Zhao Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376839

Main principles for multiple target tracking are data association and state estimation. Multiple Hypothesis Tracking (MHT) and Multiple Models (MM) methods have been the prevailing data association and state estimation methods for maneuvering targets tracking. A MM/MHT algorithm which incorporates multiple model mechanics into MHT framework has been designed and implemented in this paper. The algorithm is tested for a typical scenario in simulation, the results show that MM/MHT algorithm is effective and feasible to use in real tracking systems.

关键词： Target tracking Radar tracking Computational modeling Covariance matrices Algorithm design and analysis state estimation Filtering

来源：评论

学校读者我要写书评

暂无评论

Six Degree-of-Freedom Haptic Simulation of Sharp Geometric Features using a Hybrid Sphere-tree Model

Six Degree-of-Freedom Haptic Simulation of Sharp Geometric F...

引用

IEEE/RSJ International Conference on Intelligent Robotics and systems

作者： Ge Yu Dangxiao Wang Yuru Zhang Xin Zhang State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing 100191 China

ISBN: (纸本)9781467317375

Subtle force feelings caused by contacts at sharp geometric features are necessary to achieve high-fidelity haptic rendering. It is a challenging problem to achieve six degree-of-freedom (6-DOF) haptic simulation with sharp features for multi-region contacts scenario. We propose a configuration-based optimization method using a hybrid sphere-tree model to compute constraint-based collision response. Based on the variance of dihedral angle between adjacent triangles, an original triangle mesh of the simulated object is segmented into a hybrid sphere-tree model, i.e. a hierarchical sphere-tree for global shape and several linear-lists of spheres for local areas with sharp features. In each local area with sharp features, we first identify those spheres which radius is larger than a pre-defined perceptual threshold. Then these spheres are divided into a linear list of smaller spheres by a splitting method. The experiment results on a sphere-cube interaction and a spline-shaped peg-hole interaction validate that the proposed method can simulate a subtle force direction change when sliding contact occurs across the sharp edges. Non-penetration between the two objects can be maintained for multi-region contacts scenario. The haptic rendering rate is over 1kHz and the interaction is stable.

关键词： 6-DOF a spline-shaped peg-hole the interaction Haptic Device Component Spheres Touch simulating CONTACT Sliding contacts Dihedral angle HYBRID Hybrid electric vehicles Triangle optimization method Rendering

来源：评论

学校读者我要写书评

暂无评论

LateralPaD: A surface-haptic device that produces lateral forces on a bare finger

LateralPaD: A surface-haptic device that produces lateral fo...

引用

2012 IEEE Haptics Symposium, HAPTICS 2012

作者： Dai, Xiaowei Colgate, J. Edward Peshkin, Michael A. State Key Lab. of Virtual Reality Technology and Systems Beihang University 37 Xueyuan Rd Haidian District Beijing 100191 China Northwestern University 2145 Sheridan Rd Evanston IL 60208 United States

ISBN: (纸本)9781467308090

The LateralPaD is a surface haptic device that generates lateral (shear) force on a bare finger, by vibrating the touch surface simultaneously in both out-of-plane (normal) and in-plane (lateral) directions. A prototype LateralPaD has been developed in which the touch surface is glass, and piezoelectric actuators drive normal and lateral resonances at the same ultrasonic frequency (∼22.3 KHz). The force that develops on the finger can be controlled by modulating the relative phase of the two resonances. A 2DOF load cell setup is used to characterize the dependence of induced lateral force on vibration amplitude, relative phase, and applied normal force. A Laser Doppler Vibrometer (LDV) is used to measure the motion of glass surface as well as of the fingertip. Together, these measurements yield insight into the mechanism of lateral force generation. We show evidence for a mechanism dependent on tilted impacts between the LateralPaD and fingertip. © 2012 IEEE.

关键词： Piezoelectric actuators

来源：评论

学校读者我要写书评

暂无评论

The effect of anatomic variations of circle of Willis on cerebral blood distribution during posture change from supination to standing: A model study

The effect of anatomic variations of circle of Willis on cer...

引用

作者： Zhang, Chi Li, Shuyu Pu, Fang Fan, Yubo Li, Deyu Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University No. 37 Xueyuan Road Beijing100191 China State Key Lab of Virtual Reality of Technology and Systems Beihang University Beijing100191 China

The anatomic variation of Circle of Willis (CoW) has great impact on its compensatory capacity during stroke and cerebral ischemia. In the present study, a series of lumped parameter models were developed and used to simulate the effect of postural changes on the cerebral blood flow in ICA stenosis patients with different anatomic variants of the CoW. The results showed that the asymmetric distribution of cerebral blood flow caused by stenosis was attenuated in standing position in complete and half-complete CoW. However, in incomplete CoW, the decrease in blood flow in the ipsilateral cerebral arteries caused by unilateral ICA stenosis was dramatic in both supine and standing positions, a likely result of inadequate collateral circulation within the CoW. In conclusion, the anatomic variation of CoW plays a significant role in maintaining the balance of cerebral blood supply in patients with ICA stenosis, especially during postural change. © 2014 - IOS Press and the authors.

关键词： Blood

来源：评论

学校读者我要写书评

暂无评论

Preliminary study on haptic-stimulation based brainwave entrainment

Preliminary study on haptic-stimulation based brainwave entr...

引用

World Haptics Conference

作者： Dangxiao Wang Mu Xu Yuru Zhanq Jing Xiao State Key Lab of Virtual Reality Technology Systems Beihang University Beijing China State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China Department of Computer Science University of North Carolina Charlotte USA

Auditory or visual stimulation has been widely used for brainwave entrainment, i.e. to modulate brain electroencephalograms (EEG) signals into a specific target frequency band. In this work, we study whether similar phenomena exists with haptic stimulation. By using a Phantom desktop to provide a sinusoidal force stimulation to a human subject's hand, and using a Nexus EEG device for real-time brain signal monitoring, we test how the Sensory Motor Rhythm (SMR) signal and the Alpha signal of the subject responds to the haptic stimulation. Our experiments show that the energy level of SMR signal tends to increase considerably (on average 10~30% of 8 human subjects) after 10-15 minutes of haptic stimulation with a 15Hz stimulation signal, and the energy level of Alpha signal tends to decrease considerably (on average 10~30% of 8 human subjects) after 10-15 minutes of haptic stimulation with a 10Hz stimulation signal. These results may have potential application in training human concentration and/or relaxation skills.

关键词： Haptic interfaces Electroencephalography Visualization Training Electrodes Phantoms Monitoring

来源：评论

学校读者我要写书评

暂无评论

Visual and textual sentiment analysis using deep fusion convolutional neural networks

arXiv

引用

arXiv 2017年

作者： Chen, Xingyue Wang, Yunhong Liu, Qingjie State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing100191 China

Sentiment analysis is attracting more and more attentions and has become a very hot research topic due to its potential applications in personalized recommendation, opinion mining, etc. Most of the existing methods are based on either textual or visual data and can not achieve satisfactory results, as it is very hard to extract sufficient information from only one single modality data. Inspired by the observation that there exists strong semantic correlation between visual and textual data in social medias, we propose an end-to-end deep fusion convolutional neural network to jointly learn textual and visual sentiment representations from training examples. The two modality information are fused together in a pooling layer and fed into fully-connected layers to predict the sentiment polarity. We evaluate the proposed approach on two widely used data sets. Results show that our method achieves promising result compared with the state-of-the-art methods which clearly demonstrate its competency. Copyright © 2017, The Authors. All rights reserved.

关键词： Sentiment analysis

来源：评论

学校读者我要写书评

暂无评论

Automatic 3D Atrial Segmentation from GE-MRIs Using Volumetric Fully Convolutional Networks 9th

Automatic 3D Atrial Segmentation from GE-MRIs Using Volumetr...

引用

9th International Workshop on Statistical Atlases and Computational Models of the Heart: Atrial Segmentation and LV Quantification Challenges, STACOM 2018, held in conjunction with Medical Image Computing and Computer-Assisted Intervention, MICCAI 2018

作者： Xia, Qing Yao, Yuxin Hu, Zhiqiang Hao, Aimin State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China School of Automation Science and Electrical Engineering Beihang University Beijing China School of Electronics Engineering and Computer Science Peking University Beijing China

ISBN: (纸本)9783030120283

In this paper, we propose an approach for automatic 3D atrial segmentation from Gadolinium-enhanced MRIs based on volumetric fully convolutional networks. The entire framework consists of two networks, the first network is to roughly locate the atrial center based on a low-resolution down-sampled version of the input and cut out a fixed size area that covers the atrial cavity, leaving out other pixels irrelevant to reduce memory consumption, and the second network is to precisely segment atrial cavity from the cropped sub-regions obtained from last step. Both two networks are trained end-to-end from scratch using 2018 Atrial Segmentation Challenge (http://***/ ) dataset which contains 100 GE-MRIs for training, and our method achieves satisfactory segmentation accuracy, up to 0.932 in Dice Similarity Coefficient score evaluated on the 54 testing samples, which ranks 1st among all participants. © 2019, Springer Nature Switzerland AG.

关键词： Gadolinium

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：