检索结果-内蒙古大学图书馆

An approach to extract state information from multivariate time series

Journal of Computers (Taiwan) 2020年第6期31卷 1-11页

作者： Gui, Jun Zheng, Zeyu Qin, Zhaobo Jia, Danping Gao, Yuan Liu, Zhi Yao, Qingfeng Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China University of Chinese Academy of Sciences Beijing100049 China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110016 China Key Laboratory of Network Control System Chinese Academy of Sciences Shenyang110016 China School of Information Science and Engineering Shenyang University of Technology Shenyang110870 China

system behaviors could be recorded as multivariate time series by smart sensors. It is challenging to interpret such high-dimensional dataset with a one-dimensional temporal state sequence. In this paper, we propose a new approach DBSE (Distribution-based States Extraction) which is based on statistical and clustering analysis. State extraction problem could be resolved through using distribution parameters to describe each subsequence in multivariate time series and applying clustering method to extract states based on distribution similarity in order to obtain a temporal state sequence and information of each state. We validate DBSE and demonstrate how to use DBSE in real-world by extracting state information from a wearable sensor dataset (PAMAP2_Dataset). By comparing DBSE with TICC (Toeplitz Inverse Covariance-based Clustering) and FCM (Fuzzy C-means Clustering), the new approach is more accurate and effective. Moreover, DBSE is also expected to facilitate future behavior analysis. © 2020 Computer Society of the Republic of China. All rights reserved.

关键词： Extraction

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to “A critical review on mechanical micro-drilling of glass and carbon fibre reinforced polymer (GFRP and CFRP) composites” [Compos B: Eng 254 (2023) 110589]

引用

Composites Part B: engineering 2023年 262卷

作者： Norbert Geier Karali Patra Ravi Shankar Anand Sam Ashworth Barnabás Zoltán Balázs Tamás Lukács Gergely Magyar Péter Tamás-Bényei Jinyang Xu J Paulo Davim Budapest University of Technology and Economics Faculty of Mechanical Engineering Department of Manufacturing Science and Engineering Budapest 1111 Hungary Indian Institute of Technology Patna Department of Mechanical Engineering Patna 801103 India Birla Institute of Technology Department of Mechanical Engineering Patna Campus Patna 800014 India North of England Robotics Innovation Centre The University of Salford Salford Greater Manchester UK Budapest University of Technology and Economics Faculty of Mechanical Engineering Department of Polymer Engineering Műegyetem rkp. 3 Budapest 1111 Hungary ELKH–BME Research Group for Composite Science and Technology Műegyetem rkp. 3 Budapest 1111 Hungary Shanghai Jiao Tong University School of Mechanical Engineering State Key Laboratory of Mechanical System and Vibration Shanghai 200240 PR China University of Aveiro Department of Mechanical Engineering Centre for Mechanical Engineering and Automation (TEMA) Campus Santiago Aveiro 3810-193 Portugal

来源：评论

学校读者我要写书评

暂无评论

Large Deflection of a Compliant Beam with Non-uniform Stiffness Distribution using a PRB-3R Model

Large Deflection of a Compliant Beam with Non-uniform Stiffn...

引用

IEEE International Conference on Real-time Computing and robotics (RCAR)

作者： Hu Jin Tao Fang Haoyao Chen Tanju Yildirim Weihua Li Shiwu Zhang University of Science and Technology of China Hefei China School of Mechanical Engineering and Automation in Harbin Institute of Technology Shenzhen and the State Key Laboratory of Robotics and System China University of Wollongong Wollongong NSW Australia

ISBN: (数字)9781728137261

ISBN: (纸本)9781728137278

Soft arms of service robots for safe manipulation, or soft legs of mobile robots for efficient locomotion have been intensively developed. The deflection of complaint beams for the soft arms or soft legs is a key criterion for design and control of robotic motions. Pseud-rigid-body (PRB) model are commonly used to predict deflection of the compliant beams with a uniform stiffness. However, soft robotic arms and legs often possess a non-uniform stiffness distribution for improving manipulation effectiveness and locomotion efficiency. In this work, a PRB-3R model is used to predict large deflections of a compliant beam with a non-uniform distribution of stiffness. By using the Euler-Bernoulli beam theory, the large deflection of a cantilever beam with a non-uniform stiffness distribution under an applied load was also derived. Results show that the PRB-3R model can precisely predict mechanical behavior of compliant beams that are not too sharp. It is not proper to apply this model to beams with very large slope. This work provides an effective design method for the soft appendages of a biomimetic robot.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Interleaved Boost PFC control strategy based on repetitive control

Interleaved Boost PFC control strategy based on repetitive c...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： JiaQi Zheng Tao Zhang Hualiang Zhang Pengpeng Ren Rongkai Su College of Information Science and Engineering Northeastern University Shenyang China Key Laboratory of Network Control System Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang China

ISBN: (纸本)9781728133997

In this paper, the working principle of the staggered parallel Boost power factor correction (PFC) circuit is studied. The main circuit adopting the topology of the rectifier device has the following problems: the input current contains higher harmonics, the control system has poor steady-state performance, and the dynamic performance is low. The current loop of the control system adopts the improved repetitive PI double loop control instead of the traditional PI control method to realize the no-difference tracking of the higher harmonics, and to effectively suppress the higher harmonics contained in the output current, so that the control system has good steady-state performance; Combining repetitive control with PI control to effectively compensate for the dynamic performance reduced by the repetitive control. In order to verify the effectiveness of the proposed method, the improved repeated PI double loop control method is compared with the traditional PI control method. The simulation results show that the improved repeated PI double loop control can improve the input current waveform of the rectifier, improve the power factor of the converter, and reduce the THD value of the input current of the rectifier device.

关键词： Voltage control Control systems Rectifiers Steady-state Inductors Reactive power Frequency control

来源：评论

学校读者我要写书评

暂无评论

GC-IGTG: A rehabilitation gait trajectory generation algorithm for lower extremity exoskeleton

GC-IGTG: A rehabilitation gait trajectory generation algorit...

引用

2019 IEEE International Conference on robotics and Biomimetics, ROBIO 2019

作者： He, Yong Wu, Xinyu Ma, Yue Cao, Wujing Li, Nan Li, Jinke Feng, Wei Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Shenzhen518055 China Department of Mechanical and Automation Engineering Chinese University of Hong Kong Hong Kong

ISBN: (纸本)9781728163215

It is important to offer a natural and personalized rehabilitation gait trajectory, especially in the early stages of walking rehabilitation, for the patients with lower limb disability. Lower extremity exoskeleton has been proven to be efficient to provide highly repeatable and accurate rehabilitation exercise, but most existing exoskeletons' gait trajectories won't vary with the users. This paper proposes an algorithm, named as gait cell based individualized gait trajectory generation (GC-IGTG), for the purpose of offering a natural and personalized gait trajectory reference for the lower extremity exoskeleton based on the body parameters of the patients. The GC-IGTG is based on extreme learning machine and AutoEncoder, which makes it achieve fast training speed and suitable for small sample training conditions. The gait cell concept is proposed to improve the efficiency and safety of the algorithm. The experimental results indicate that the generated trajectories with GC-IGTG are almost identical to the original ones. © 2019 IEEE.

关键词： Patient rehabilitation

来源：评论

学校读者我要写书评

暂无评论

Building multi-modal sensory feedback pathways for SRL with the aim of sensory enhancement via BCI

Building multi-modal sensory feedback pathways for SRL with ...

引用

IEEE International Conference on robotics and Biomimetics

作者： Wenjie Wang Yuan Liu Zhicai Li Zhuang Wang Feng He Dong Ming Dapeng Yang Academy of Medical Engineering and Translational Medicine Tianjin University China College of Precision Instruments and Optoelectronics Engineering Academy of Medical Engineering and Translational Medicine Tianjin University China State Key Laboratory of Robotics and system (HIT) Harbin Institute of Technology Harbin China

Recently, the Supernumerary Robotic Limbs (SRL) have emerged in the field of robotics for enhancing the user's ability without replacing natural limbs. Lots of researches have contributed to the mechanical design and control of SRL. However, building an artificial sensory nerve pathway of SRL has been largely ignored. In this paper, we built a multi-modal sensory feedback pathway for SRL. Three kinds of sensory pathway contained 1) fingertip pressure, 2) slippage and 3) proprioception information are built under the consideration of SRL platform through electrical stimulation. According to the experiment results of event-related potential (ERP) amplitude, establish the relationship between the physical parameters of the stimulus and the sensation. In addition, enhancement potentials of human sensation based on the brain-computer interface (BCI) is found in two aspects contained: 1) improvement of subjective perception resolution; 2) Shorten the time of sensory recognition. This paper can be used to objectively benchmark the human subjective and individualized sensation, and guide researchers to build the SRL sensory feedback pathways.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Miniature 3D Depth Camera for Real-time Reconstruction

Miniature 3D Depth Camera for Real-time Reconstruction

引用

IEEE International Conference on robotics and Biomimetics

作者： Zilong Zhao Feifei Gu Pengju Xie Huazhao Cao Zhan Song College of Computer Science and Electronic Engineering Hunan University Changsha China Shenzhen Key Laboratory of Minimally Invasive Surgical Robotics and System Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China

This paper developed a miniature 3D vision system for dynamic depth recovery. Our system is constituted by a DOE projector and two cameras. A single pattern with pseudo-random speckles was projected onto the surface of the target object and the coupling pattern was imaged by the stereo cameras. An optimal camera calibration algorithm is adopted to guarantee the measurement accuracy. The speckle pattern projected through a diffractive optical element (DOE) of size 8mm×8mm. The baseline between the stereo cameras is as short as 50mm. The system has the advantages of simple structure, small size, and low cost. It can be easily integrated into mobile devices such as tablet computers and mobile phones. In comparison with several other mature products, the proposed 3D depth camera can achieve 3D reconstruction with higher accuracy.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Dynamic modeling and analysis of the drill stem in the lunar soil drilling sampler 15

Dynamic modeling and analysis of the drill stem in the lunar...

引用

15th IEEE International Conference on Mechatronics and Automation, ICMA 2018

作者： Yang, Shuai Han, Jianchao Hu, Huajun Lai, Xiaoming Zhang, Jiabo Sun, Jing Pan, Bo Beijing Spacecrafts China Academy of Space Technology Beijing China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China Institute of Spacecraft System Engineering China Academy of Space Technology Beijing China

ISBN: (纸本)9781538660720

Mechanics researches related to the drill stem of the lunar soil drilling sampler mainly focus on the interaction characteristics between the drill stem and the soil at present, while the mechanical analysis of the drill stem itself is relatively less and can't reflect the actual working process. Aimed at this problem, it is presented in this paper that the flexible multibody dynamic model of the drill stem in the initial stage of drilling on lunar surface and the analysis results obtained by using the variable-length beam-shaft element. It turned out that to improve the drilling precision of the sampler, it is necessary to set up a special amplitude limiting mechanism between the rotating drive mechanism and the fixed support and lower the amplitude limiting mechanism in a suitable position to constitute an approximate clamped constraint with the fixed support to the drill stem. Works in this paper could provide theoretical basis for the design of amplitude limiting mechanism and raise the reliability of the lunar soil drilling sampler accordingly. © 2018 IEEE.

关键词： Soils

来源：评论

学校读者我要写书评

暂无评论

Design and experimental research of the rotation-impact shafting in the lunar soil drilling sampler 15

Design and experimental research of the rotation-impact shaf...

引用

15th IEEE International Conference on Mechatronics and Automation, ICMA 2018

作者： Liu, Xiaoqing Yang, Shuai Han, Jianchao Hu, Huajun Sun, Qichen Lai, Xiaoming Sun, Jing Beijing Spacecrafts China Academy of Space Technology Beijing China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China Institute of Spacecraft System Engineering China Academy of Space Technology Beijing China

ISBN: (纸本)9781538660720

In order to satisfy the function and performance requirements of the lunar soil deep sampling, a novel rotation-impact shafting used in the lunar soil drilling sampler is developed through requirements analysis, schematic design, theoretical calculation, dynamic simulation analysis and experimental verification. The novel rotation-impact shafting could adapt to the severe environments of the space and the lunar surface. The rotary motion and percussive motion can be adjusted separately or synchronously, which not only satisfies the diversity requirements of the drilling procedure in the sampling process, but also improves the reliability of the rotation-impact shafting. The experimental results show that the rotation-impact shafting could transmit the rotary cutting power and the impact rock-breaking power effectively to the driller. Furthermore, the rotation-impact shafting has broad application prospects in the soil sampling mechanisms of other extraterrestrial bodies as well as some other spacecraft mechanism products. © 2018 IEEE.

关键词： Rotation

来源：评论

学校读者我要写书评

暂无评论

FIST-Toy: A benchmark dataset for toy component classification

FIST-Toy: A benchmark dataset for toy component classificati...

引用

2019 IEEE International Conference on Real-Time Computing and robotics, RCAR 2019

作者： Qi, Chongchong Gong, Libo Cheng, Jun Tao, Dapeng FIST LAB School of Information Science and Engineering Yunnan University Kunming Yunnan650091 China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Yunnan Rural Science and Technology Service Center Kunming Yunnan650000 China Chinese University of Hong Kong Hong Kong999077 Hong Kong

ISBN: (纸本)9781728137261

As a comprehensive technology of machinery, electronics and computer vision, industrial automation technology has been attracting extensive attention and developed rapidly recently years. The refinement of target classification plays an important role in the industrial automation, therefore, many computer vision based target classification methods have been proposed. However, there is few real industrial dataset can be used to evaluating the target classification algorithms. In this paper, we construct a novel toys dataset, named FIST-Toy, including 7411 images of 31 categories. Base on the proposed dataset, we conduct a comprehensive study of the state-of-the-art pretraining target classification models qualitatively and quantitatively. In addition, we propose a weight voting based classification neural network. By comparing with AlexNET, VggNet, Inception and ResNet, the proposed model outperforms in fine-grading. We evaluate the FIST-Toy dataset using various deep learning models. And the experimental results show that the FIST-Toy dataset provides a benchmark to evaluate the performance of different methods for target classification. © 2019 IEEE.

关键词： Computer vision

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：