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第十一届中国虚拟现实大会(ICVRV2011)

作者： Tian Zhou Yue Qi State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

Generally, mechanical parts in virtual Assembly systems are donated by rigid bodies. In this paper, we introduce a deformation technique called Lattice Shape Matching algorithm to animate deformable objects in virtual environment. Plenty of experiments have indicated the deformation algorithm can perform well on real-time operation, simulation authenticity and interactive stability. By changing the lattice width value we can animate many objects with different stiffness. With the deformation algorithm, the virtual Assembly system can be used to the assembly/disassembly of aircraft/vehicle engine, bicycle repair and many other mechanical structure applications.

关键词： virtual assembly deformation lattice shape matching animation

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Visio-haptic Simulation for Detection of Dental Cavity Profile

Visio-haptic Simulation for Detection of Dental Cavity Profi...

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2011 IEEE International Conference Mechatronics and Automation(2011 IEEE机电一体化与自动化国际会议)

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

In this paper, a feasible approach for cavity profile detection simulation is presented to help dental students learning skills of cavity diagnosis. The cavity profile is modeled as partitioned meshes with different physical properties. To simulate the realistic feeling stem from stiffness, viscosity and friction, several components of force are introduced when dental tool probing the sound portion and carious sites of teeth. In the process of probing, the force vibration may appear around the cavity boundary. To eliminate the vibration, a locking method is proposed to keep the tool's avatar maintaining its collision status. The experiments show that user can clearly identify the prescribed cavity profile and no force vibration occurs around the boundary. The proposed method can also be extended to the other multi-tissues boundary detection for a stable force feedback.

关键词： cavity detection multi-tissues haptic rendering stereoscopic display force feedback model

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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...

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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

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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...

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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

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Preliminary study on haptic-stimulation based brainwave entrainment

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

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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

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

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

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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

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Verbally Assisting virtual-Environment Tactile Maps: A cross-linguistic and cross-cultural study

Advances in Intelligent Systems and Computing

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Advances in Intelligent systems and Computing 2014年 215卷 821-831页

作者： Lohmann, Kris Yu, Junlei Kerzel, Matthias Wang, Dangxiao Habel, Christopher Department of Informatics University of Hamburg Hamburg Germany State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

The Verbally Assisting virtual-Environment Tactile Maps (VAVETaM) approach proposes to increase the effectiveness of tactile maps by realizing an intelligent multi-modal tactile map system that generates assisting utterances that generates assisting utterances acquiring survey knowledge from virtual tactile maps. Two experiments in German conducted with blindfolded sighted people and with blind and visually impaired people show that both types of participants benefit from verbal assistance. In this paper, we report an experiment testing the adaptation of the German prototype to be useable by Chinese native speakers. This study shows that the VAVETaM system can be adapted to Chinese language with comparable small effort. The Chinese participants' achievement in acquiring survey knowledge is comparable to those of the participants in the German study. This supports the view that human processing of representationally multi-modal information is comparable between different cultures and languages. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Mergers and acquisitions

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VibroArm: Enhancing the Sensation of Forearm Deformation in virtual reality Using Vibrotactile Funneling Illusion

VibroArm: Enhancing the Sensation of Forearm Deformation in ...

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International Symposium on Mixed and Augmented reality (ISMAR)

作者： Yilong Lin Tianze Xie Yingjie Chang Hu Luo Dangxiao Wang Seungwoo Je School of Design Southern University of Science and Technology State Key Lab of Virtual Reality Technology and Systems Beihang university

ISBN: (数字)9798331516475

ISBN: (纸本)9798331516482

When we enter virtual reality (VR) in the first person, the avatar replaces our real body. Within a certain range of mismatches, we tend to identify with our avatar and perceive it as our own body. Previous research has shown that we can even believe that a deformed forearm is our own through haptic and visual feedback. However, the haptic devices used in earlier research were only explored using skin-stretching and weight-shifting. Vibrotactile feedback is the most common technique used to create a haptic VR experience in academia and industry because of its light weight and ease of application. Taking these advantages, we introduce VibroArm, a lightweight wearable haptic system with the vibrotactile funneling illusion that enhances the virtual forearm’s ownership in the forearm deformation illusion. In a perceptual study, we determined that users can make correct direction judgments about vibration on the forearm in different directions. The result shows that all vibration patterns can be sufficiently recognized, with an average recognition rate of $87.17 \%$. Based on our results, we designed 18 vibration patterns and compared their impact on the forearm deformation illusion. Finally, our study shows that using VibroArm in VR applications can significantly improve user realism and enjoyment compared to relying on visual feedback alone.

关键词： Vibrations Industries Visualization Deformation Avatars Haptic interfaces Pattern recognition Trajectory Augmented reality

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A Multi-metric QoS Routing Method for Ad Hoc Network

A Multi-metric QoS Routing Method for Ad Hoc Network

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Jing Cao Wei Wu State Key Lab of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing China

A multimetric QoS routing protocol (MQOLSR) is proposed in this paper, which providing different QoS for different applications flow in an ad hoc network. The protocol, which integrates QoS measurement and packet forwarding, expands the topology discovery and routing computing mechanism of the OLSR protocol. It can provide different routing and forwarding service according to different application flow. The experimental results show that the MQOLSR protocol improves the network performance. Compared to the traditional OLSR protocol, the proposed routing protocol increases network throughput by 31.8% and reduces delay jitter when transmitting IPTV, while its routing overhead and routing discovery time are within an acceptable range.

关键词： Ad hoc networks Bandwidth Routing protocols Jitter Network topology Computer networks virtual reality Computer science Delay effects Access protocols

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Dynamic ocean inverse modeling based on differentiable rendering

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Computational Visual Media 2024年第2期10卷 279-294页

作者： Xueguang Xie Yang Gao Fei Hou Aimin Hao Hong Qin State Key Lab of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Qingdao Research Institute Beihang UniversityQingdao 266100Chinaand Peng Cheng LabShenzhen 518000China SKLCS Institute of SoftwareChinese Academy of SciencesBeijing 100190Chinaand University of Chinese Academy of SciencesBeijing 100049China Department of Computer Science Stony Brook University(SUNY at Stony Brook)Stony BrookNew York 11794-2424USA

Learning and inferring underlying motion patterns of captured 2D scenes and then re-creating dynamic evolution consistent with the real-world natural phenomena have high appeal for graphics and *** bridge the technical gap between virtual and real environments,we focus on the inverse modeling and reconstruction of visually consistent and property-verifiable oceans,taking advantage of deep learning and differentiable physics to learn geometry and constitute waves in a self-supervised ***,we infer hierarchical geometry using two networks,which are optimized via the differentiable *** extract wave components from the sequence of inferred geometry through a network equipped with a differentiable ocean ***,ocean dynamics can be evolved using the reconstructed wave *** extensive experiments,we verify that our new method yields satisfactory results for both geometry reconstruction and wave ***,the new framework has the inverse modeling potential to facilitate a host of graphics applications,such as the rapid production of physically accurate scene animation and editing guided by real ocean scenes.

关键词： inverse modeling surface reconstruction wave modeling ocean waves differentiable rendering(DR)

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