检索结果-内蒙古大学图书馆

作者： Li, Fang-Wen Shen, Xu-Kun State Key Lab of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing 100191 China

Component-based software reuse and development is considered to be the best way to improve the efficiency and quality of development. To meet the demands of aircraft instrument exhibition in an aviation virtual library, we present a modeling and simulation tool for cockpit instruments on component methods, achieving display functionality and providing a visual interaction platform in the aviation virtual library. For the rapid model construction and reuse of virtual library resources, we classify entities in the cockpit into several categories by their behavior, and design a template for each category to describe its attributes. This efficiently reduces the modeling cycle, and thus largely helps users to take advantage of the library resource. © 2010 Zhejiang University and Springer-Verlag Berlin Heidelberg.

关键词： Computer software reusability

来源：评论

学校读者我要写书评

暂无评论

VibroArm: Enhancing the Sensation of Forearm Deformation in virtual reality Using Vibrotactile Funneling Illusion 23

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

引用

23rd IEEE International Symposium on Mixed and Augmented reality, ISMAR 2024

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

ISBN: (纸本)9798331516475

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. © 2024 IEEE.

关键词： virtual environments

来源：评论

学校读者我要写书评

暂无评论

DentalTouch: A haptic display with high stiffness and low inertia 7

DentalTouch: A haptic display with high stiffness and low in...

引用

7th IEEE World Haptics Conference, WHC 2017

作者： Zhang, Hongdong Zhang, Yuru Wang, Dangxiao Lu, Lei State Key Lab of Virtual Reality Technology and Systems Beihang University No. 37 Xueyuan Road Beijing100191 China

ISBN: (纸本)9781509014255

Designing haptic devices with both high stiffness and low inertia is challenging. In this paper, we propose a solution to overcome the difficulty. We present a new haptic device named DentalTouch for dental simulation. Combining parallel and serial mechanisms, the DentalTouch can render 3-dimentional forces and 6 degree-of-freedom (DOF) motions. We describe how to achieve high stiffness and low inertia in the DentalTouch by using co-actuation method recently developed by our group. We evaluate the stiffness and inertia performance of a DentalTouch prototype through analytical and experimental approaches. The results show that the combined structural and motor control stiffness of the prototype is within the range of 21-69 N/mm and the inertia ranges from 113 to 163 g in task workspace, which demonstrates that the DentalTouch has a potential to provide a high stiffness and low inertia. © 2017 IEEE.

关键词： Stiffness

来源：评论

学校读者我要写书评

暂无评论

Absolute and discrimination thresholds of a flexible texture display 7

Absolute and discrimination thresholds of a flexible texture...

引用

7th IEEE World Haptics Conference, WHC 2017

作者： Guo, Xingwei Zhang, Yuru Wang, Dangxiao Jiao, Jian State Key Lab of Virtual Reality Technology and Systems Beihang University No. 37 Xueyuan Road Beijing100191 China

ISBN: (纸本)9781509014255

We present a flexible tactile interface, FlexTouch, for simulating texture of fabrics. The FlexTouch displays virtual texture on fingertips based on electrovibration principle. To exam human factors in using FlexTouch, we measured absolute detection thresholds of input voltage with respect to frequencies ranging from 30 to 300 Hz. The measured thresholds formed a U-shaped curve indicating a minimum value of 23 Vpp at the frequency of 169 Hz. We then measured the just-noticeable-differences (JNDs) of the voltage amplitudes ranging from 71 to 225 V at the most sensitive frequency, i.e. 169 Hz. The result suggests that the JNDs depend linearly on the amplitude of stimulus signal. These measures provide guidelines to design interfaces and applications using FlexTouch. © 2017 IEEE.

关键词： Textures

来源：评论

学校读者我要写书评

暂无评论

Quantifying differences between five fingers in speed-accuracy tradeoff for force control tasks 7

Quantifying differences between five fingers in speed-accura...

引用

7th IEEE World Haptics Conference, WHC 2017

作者： Peng, Cong Wang, Dangxiao Zhang, Yura Li, Teng State Key Lab of Virtual Reality Technology and Systems Beihang University No. 37 Xueyuan Road Beijing100191 China

ISBN: (纸本)9781509014255

The differences of force control capability among individual fingers have been studied in a wide range of contexts. However, the quantitative metric in term of the speed-accuracy tradeoff (SAT) between five fingers has not been systematically investigated. In this paper, we aim to explore this question by measuring SAT of each finger in a precision force control task. During the experiment, participants pressed a force sensor using one of the five fingers of the right hand in an immersive scene. They were instructed to maintain a target force with an expected tolerance within an allowable response time in each trial. The performance of the SAT for each finger was measured under different index of difficulty (ID). The experimental data showed that the SAT characteristic of individual fingers was significantly different. The quantifiable differences of the index of performance (IP) among individual fingers were obtained, which may provide a guideline for design of manipulation products or tasks requiring fast and accurate force control using different fingers. © 2017 IEEE.

关键词： Force control

来源：评论

学校读者我要写书评

暂无评论

Modeling and simulation of stress for cemented carbide cylindrical end mill

Modeling and simulation of stress for cemented carbide cylin...

引用

25th European Modeling and Simulation Symposium, EMSS 2013

作者： Qiong, W.U. Da Peng, Li State Key Lab of Virtual Reality Technology and Systems School of Mechanical Engineering and Automation Beihang University Beijing 100191 China

ISBN: (纸本)9788897999225

The cutting force and stress of tool is important factor for failure of tool in the cutting process. Predictions of the forces and stress in milling are often needed in order to establish automation or optimization of the machining processes. A theoretical model for milling forces according to a predictive machining theory and the experiment of milling has been presented. The action of a milling cutter is considered as the simultaneous work of a number of single-point cutting tools, and milling forces are predicted from input data of the workpiece material properties, the cutter parameters and tooth geometry, and the cutting condition. Based on cutting force model, the stress of cemented carbide cylindrical end mill is developed. The numerical simulation and the experiment are performed to compare with stress model of mill. Milling tool stress experimental tests and numerical simulation separately were conducted to verify the simulation. The study provides a reliable method for analyzing stress of tool in the milling process. © 2013 DIME UNIVERSITÀ DI GENOVA.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

TACS: A transparent application bandwidth management system

TACS: A transparent application bandwidth management system

引用

IEEE 9th International Conference on Computer and Information technology, CIT 2009

作者： Chen, Xianqin Long, Xiang Gao, Xiaopeng Ma, Junjie State Key Lab. of Virtual Reality Technology and System School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9780769538365

With the rapid advance of computer and network technology, more and more applications are deployed in the customer-side network. These applications require different quality of service (QoS), but have to share a few bandwidth limited internet connections. Owing to the IP network's best-effort delivery mechanism, the QoS requirements are hard to be satisfied. There have been plenty of QoS solutions in research and industry areas, however, few of them are easy to understand or to deploy. Therefore, we provide a solution, based on a simple and clear model, has the ability of transparently deployed at the inner side of customer's gateway device and controlled in the application-oriented way. We also introduce a straightforward QoS policy definition language to allow user to create QoS rules for various applications. We conduct the evaluation of our proto type system running upon mid-end industrial personal computer under both the lab.testbed and the practical network. In the lab.test, our system achieves 200Mbps throughput, in the practical field test, our system successfully manages a 100Mbps internet link for over 3000 active users. © 2009 IEEE.

关键词： Quality of service

来源：评论

学校读者我要写书评

暂无评论

Force modeling for tooth preparation in a dental training system

引用

virtual reality 2008年第3期12卷 125-136页

作者： Liu, Guanyang Zhang, Yuru Townsend, William T. State Key Lab. of Virtual Reality Technology and System Beihang University Beijing China Robotics Institute School of Mechanical Engineering and Automation Beihang University Beijing China Barrett Technology Inc. Boston MA United States

Feedback force is very important for novices to simulate tooth preparation by using the haptic interaction system (dental training system) in a virtual environment. In the process of haptic simulation, the fidelity of generated forces by a haptic device decides whether the simulation is successful. A force model computes feedback force, and we present an analytical force model to compute the force between a tooth and a dental pin during tooth preparation. The force between a tooth and a dental pin is modeled in two parts: (1) force to resist human's operation and (2) friction to resist the rotation of the dental engine. The force to resist the human's operation is divided into three parts in the coordinates that are constructed on the bottom center of the dental pin. In addition, we also consider the effects of dental-pin type, tooth stiffness, and contact geometry in the force model. To determine the parameters of the force model, we construct a measuring system by using machine vision and a force/torque sensor to track the human's operations and measure the forces between the dental pins and teeth. Based on the measuring results, we construct the relation between the force and the human's operation. The force model is implemented in the prototype of a dental training system that uses the Phantom as the haptic interface. Dentists performing virtual operations have confirmed the fidelity of feedback force. © Springer-Verlag London Limited 2008.

关键词： Haptic interfaces

来源：评论

学校读者我要写书评

暂无评论

Spring-based measurement equipment for evaluation of 3-DOF haptic rendering algorithms

HAVE 2011 - IEEE International Symposium on Haptic Audio-Vis...

引用

HAVE 2011 - IEEE International Symposium on Haptic Audio-Visual Environments and Games, Proceedings 2011年 29-34页

作者： Wang, Zhixiang Wang, Dangxiao Song, Tao State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781457704987

Evaluation of haptic rendering algorithms is an important topic to achieve realistic haptic simulation. In this paper, we developed a spring-based measurement equipment to enable quantified evaluation for 3-DOF (Degree of Freedom) haptic rendering of contact between a point-shaped tool and a complex-shaped object. We proposed a new method to formulate the trajectory of the haptic tool, which will be the input signal for the target haptic rendering algorithm. Using three springs between human's hand and the probe's tip, we can precisely mimic the limited Z-Width characteristic of current haptic devices. Furthermore, we introduced a spatial registration algorithm to establish the transformation from the local frame of the force sensor to the normal of contact point, thus maintain the computed normal force is always along the normal direction. Preliminary contact experiment against a planar surface is carried out to validate the performance of our method. Experiment results showed our method can capture the real-time force and motion signal during contact, and can be utilized to evaluate performance of various haptic rendering algorithms. © 2011 IEEE.

关键词： Degrees of freedom (mechanics)

来源：评论

学校读者我要写书评

暂无评论

A novel fusion method of infrared and visible images based on non-subsampled contourlet transform 8th

A novel fusion method of infrared and visible images based o...

引用

8th International Conference on Image and Graphics, ICIG 2015

作者： Lu, Fei Lei, Xiaoyong State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

ISBN: (纸本)9783319219776

This paper presents a novel infrared (IR) and visible images fusion methodology based on non-subsampled contourlet transform (NSCT). NSCT shows better performance compared with usual multi-scale decomposition for its multi-scale, shift invariance, multi-direction and efficient capture of geometric structures. The proposed fusion method uses NSCT for multiresolution decomposition of the source images. The low-pass NSCT adaptive fusion weights calculated from the IR source image’s pixel statistical characteristics. The high frequency directional coefficients with max absolute value are the coefficients of the fusion NSCT high frequency. Experimental results conforms that the proposed method have better performance compared with DWT, compressed sensing based on DWT (CS-DWT), NSCT, NSCT based on spatial frequency motivated pulse coupled neural networks (SF-PCNN-NSCT) from visual effects and a list of fusion quality evaluation metrics. © Springer International Publishing Switzerland 2015.

关键词： Image fusion

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：