检索结果-内蒙古大学图书馆

The Location estimation of seismic wave propagation layer velocities

IOP Conference Series: Materials Science and engineering 2021年第1期1019卷

作者： E V Rabinovich N Y Filipenko G S Shefel Faculty of Automation and Computer Engineering Novosibirsk state technical university Novosibirsk Russia

On the basis of the original location-based technology developed by the authors for constructing seismic images of the deep structure of the earth's interiora method is proposed for estimating the seismic wave propagation layer velocities. The technology ensures the unambiguity and stability of seismic imaging by successively solving direct kinematic problems for all reflecting boundaries. It consists in locating the reflection pulse's sources from the boundaries of the deep section's layers and restoring the kinematic parameters of the layers through them. To assess the next layer velocity, information is used on the parameters of the preceding boundaries and the direct kinematic problem's solution with the additional equality's condition of local velocities at the reflection's points from the underlying boundary.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Flower Pollination Algorithm Based on Beetle Antennae Search Method

Flower Pollination Algorithm Based on Beetle Antennae Search...

引用

第四届无线通信与应用国际会议

作者： Jiayi Zhou Qian Qian Yunfa Fu Yong Feng Faculty of Information Engineering and Automation Kunming University of Science and Technology Yunnan Key Laboratory of Computer Technology Applications Kunming University of Science and Technology

In this paper, a new flower pollination algorithm based on beetle antennae search method(TBFPA) is proposed to deal with the slow convergence speed problem of traditional flower pollination algorithm. Specifically, after the new individuals are generated by the way of flower pollination algorithm, the beetle antennae search method is used to search the nearby solution space of the new individuals, thus increasing the probability to reach better solutions and speeding up the convergence speed of the algorithm. In addition, a new uniform distribution sampling method is used to generate the initial population so as to spread the initial solutions all over the solution space. In order to verify the effectiveness of TBFPA, different standard functions are tested between TBFPA and FPA algorithms and the results proved that TBFPA has faster convergence speed and stronger global searchability.

关键词： FPA Flower Pollination Algorithm Based on Beetle Antennae Search Method

来源：评论

学校读者我要写书评

暂无评论

Analytical dynamic model of coefficient of friction of air pipeline under pressure

引用

Diagnostyka 2019年第4期20卷 89-94页

作者： Dmytriv, Vasyl Dmytriv, Ihor Horodetskyy, Ivan Dmytriv, Taras Lviv Polytechnic National University Institute of Engineering Mechanics and Transport Lviv Ukraine Lviv National Agrarian University Faculty of Mechanic and Power Engineering Lviv-Dubliany Ukraine Lviv Polytechnic National University Institute of of Computer Technologies Automation and Metrology Lviv Ukraine

To transport of the air in the pipeline, an analytical model is developed that takes into account the gas velocity, its kinematic and dynamic characteristics - density, viscosity depending on the pressure in a given space of the pipeline. The analytical model makes it possible to calculate the coefficient of friction of gas transportation in the pipeline at intervals of the absolute pressure from 220 to 2 kPa and M 1* aspect ratio is proposed, which characterizes in time the ratio of the dynamic force of movement of gas to the static pressure related to the diameter of the pipeline. The coefficient of air friction was modeled according to the vacuum pressure as a parameter of density and air flow. Air flow was taken from 1.917 · 10-3 m3/s to 44.5 · 10-3 m3/s respectively, diameters from 0.030 to 0.070 m and Mach number was M = 0.005-0.13. At the vacuum and excess pressures with increasing of Reynolds number and decreasing of Mach number the gas friction coefficient increased linearly. According to the simulation results as the pressure loss and the diameter of the pipeline are increased the friction coefficient increased as well. Analogically, at the vacuum metric pressure when the pressure loss and the diameter of the pipeline are increased the friction coefficient increased. At the pipeline internal diameters of 22, 30, 36 mm accordingly for pressure losses from 2 to 14 kPa the coefficient of air friction varies from 0.006 to 54.527 respectively. © 2019 Polish Society of Technical Diagnostics. All rights reserved.

关键词： Reynolds number

来源：评论

学校读者我要写书评

暂无评论

An Opponent Colour LGMD Neural Network for Collision Detection at Night with Thermal Camera

SSRN

引用

SSRN 2023年

作者： Zhang, Yicheng Han, Huizi Luan, Hao Hua, Mu Liu, Mei Cuayahuitl, Heriberto Yue, Shigang School of Automation Guangdong University of Petrochemical Technology 139 Guanduer Road Guangdong Maoming525000 China School of Computer Science University of Lincoln Brayford Pool LincolnLN6 7TS United Kingdom Faculty of Engineering The Hong Kong Polytechnic University 11 Yuk Choi Road 999077 Hong Kong School of Computer Science Tianjin University of Technology and Education No.1310 Dagu South Road Hexi District Tianjin300222 China School of Computing and Mathematical Sciences University of Leicester University Road LeicesterLE1 7RH United Kingdom

It is an enormous challenge for intelligent robots or vehicles to detect and avoid collisions at night because of poor light conditions. Thermal cameras capture the night scenes with temperature maps, often showing in different pseudo-colour modes to enhance the visual effects for the human eyes. Since the features of approaching objects could have been well enhanced in the pseudo colour outputs of a thermal camera, colour cues could likely help the collision detector - lobula giant movement detector (LGMD) to pick up the collision cues nicely. However, no investigation has been published on this aspect, and it is unclear whether the LGMD-like visual neural networks can take pseudo-colour information as inputs for collision detection in extremely dim conditions. In this study, we proposed a model consisting of three sub-networks, each dealing with one specific opponent colour channel, i.e., black-white, red-green, and yellow-blue. A collision alarm will be triggered if any channel’s output has exceeded its threshold for a few successive frames. Systematical experiments have been carried out to verify the proposed neural network with different thermal pseudo-colour modes in various nighttime scenarios. Our experiments demonstrated that the proposed bioinspired collision detection system works well in detecting colliding objects in direct collision courses at low light conditions quickly. The proposed method showed its potential to be part of the sensor systems for future robots or vehicles at night or in other extreme light conditions to avoid fatal collisions. © 2023, The Authors. All rights reserved.

关键词： Intelligent robots

来源：评论

学校读者我要写书评

暂无评论

Improved Adaptive Particle Swarm Optimization Algorithm with a Two-Way Learning Method

Improved Adaptive Particle Swarm Optimization Algorithm with...

引用

第四届无线通信与应用国际会议

作者： Yawen Wang Qian Qian Yong Feng Yunfa Fu Faculty of Information Engineering and Automation Kunming University of Science and Technology Yunnan Key Laboratory of Computer Technology Applications Kunming University of Science and Technology

Traditional particle swarm optimization algorithm has some disadvantages, such as slow convergence speed and easy to fall into local extremes. In order to improve the performance, an improved adaptive particle swarm optimization algorithm with a two-way learning method is proposed. First, the algorithm adaptively adjusts the algorithm according to the iteration periods of the optimization ***, the inertia weight and the value of the learning factor are changed nonlinearly, so as to better balance the search behavior of the particles in the group;Second,the idea of beetle search is introduced into the particle swarm algorithm to form a new two-way learning mechanism, which overcomes the limitations of the traditional particle swarm algorithm and help to increase the diversity of the *** this way, the search scope is expanded, and the search accuracy of the algorithm is enhanced. Finally, the simulation is carried out on several multi-dimensional functions, and compared with other two related algorithms. The experimental results show that under the same experimental conditions, the improved algorithm has obvious advantages in optimization ability and convergence speed.

关键词： swarm Improved Adaptive Particle Swarm Optimization Algorithm with a Two-Way Learning Method Swarm

来源：评论

学校读者我要写书评

暂无评论

Photorealistic Object Reconstruction Using Perturbation Functions and Features of Passive Stereo Projection

Photorealistic Object Reconstruction Using Perturbation Func...

引用

International Conference on Advanced computer Information Technologies (ACIT)

作者： Sergey Vyatkin Mykola Nechyporuk Alexandr Romanyuk Tatiana Troyanovskaya Oksana Romanyuk Olena Tsikhanovska Institute of Automation and Electrometry SB RAS Novosibirsk Russia Faculty of Information Technologies and Computer Engineering Vinnytsia National Technical University Vinnytsia Ukraine

ISBN: (数字)9781728167602

ISBN: (纸本)9781728167619

An effective approach to the calculation of volumetric models based on images of silhouettes in the object space is described. A method of forming the contours of a real object from a sequence of images is proposed. The construction of a bounding pyramid using the projection of the center and silhouette is shown. The intersection of all bounding pyramids determines the geometric representation of the object. Methods of obtaining information about the depth of the scene are proposed. A method of binocular stereo reconstruction of three-dimensional objects based on perturbation functions is proposed. In the method, interference is linear and requires linear compensation methods that are performed using the GPU by means of standard OpenGL. Defines the portion of the frame buffer (channel) in the GPU in which the image is output. Passive stereo uses two channels that process images intended for the left and right eye. Both channels handle a single main scene graph representing a user-defined model and attached to a root node (scene-root). Channels differ in the settings of the projection transformation (view-transform), which is determined by known parameters, such as the size and distance to the screen, the position of the user's point of view, stereo base and others, which are specified in the calibration file. The paper shows the advantages of the proposed method over the known approaches of reconstruction of three-dimensional models.

关键词： Cameras Image reconstruction Optical filters Shape Interference Calibration Information technology

来源：评论

学校读者我要写书评

暂无评论

Open-Box Target for Extrinsic Calibration of LiDAR, Camera and Industrial Robot

Open-Box Target for Extrinsic Calibration of LiDAR, Camera a...

引用

IEEE International Conference on Mechatronics, Robotics and automation (ICMRA)

作者： Aquib Rashd Wolfram Hardt Alexey Kolker Mohamad Bdiwi Matthias Putz Fraunhofer IWU Chemnitz Germany TUC Chemnitz Germany Faculty of Automation and Computer Engineering Novosibirsk State Technical University Russia Fraunhofer IWU

ISBN: (数字)9781728190327

ISBN: (纸本)9781728190334

Low cost 3D LiDAR complements cameras in perception algorithms for various robotic applications. Safe and efficient human robot collaboration requires easy and accurate extrinsic calibration of sensors with an industrial robot. This work presents an efficient and accurate method for extrinsic calibration between LiDAR, camera and an industrial robot. Open-box target mounted on robot enables parameter estimation by constraining sensor data to multiple planes, which constitute the target planner surface. The method enables extraction of eight correspondences between the sensors and the robot in each data sample. The method enables speedup in sensor setup and drastically reduces efforts required for data collection through automation. The results have been evaluated for a simulated and real environment.

关键词： Laser radar Service robots Robot vision systems Estimation Cameras Calibration Sensors

来源：评论

学校读者我要写书评

暂无评论

Microphytobenthos Spatio-Temporal Dynamics Across an Intertidal Gradient in a Tropical Estuary Using Sentinel-2 Imagery

SSRN

引用

SSRN 2024年

作者： Haro, Sara Mucheye, Tadesse Caballero, Isabel Priego, Blanca Gonzalez, Carlos Jose Gómez-Ramírez, Eddy H. Corzo, Alfonso Papaspyrou, Sokratis Department of Biology Faculty of Marine and Environmental Sciences University of Cádiz Puerto Real Cádiz11510 Spain Department of Natural Resources Management College of Agriculture and Environmental Science University of Gondar P.O. Box 196 Gondar Ethiopia Puerto Real Cádiz11510 Spain Department of Automation Engineering Electronics and Computer Architecture and Networks School of Engineering University of Cádiz Puerto Real Cádiz11510 Spain Division of Naval Support Marine Hydrographic Institute Spanish Navy Cadiz Spain Universidad de Costa Rica Escuela de Química y CIMAR San Pedro Montes de Oca San José11501-2060 Costa Rica

Intertidal mudflats are among the most productive coastal ecosystems, largely because of the activity of the photosynthetic microbial community on the sediment surface, known as microphytobenthos (MPB). While the dynamics of MPB have been extensively studied in temperate estuaries, there is limited research in tropical estuaries. To address this knowledge gap, we investigated the spatio-temporal dynamics of MPB in the Nicoya Gulf (Costa Rica), one of the world's most productive tropical estuaries, using Sentinel-2 images at 10 m spatial resolution from 2018 to 2022. We used Normalized Difference Vegetation Index (NDVI) values ranging from 0 to 0.4 to monitor MPB cover and growth rates (µNDVI, days-1). Analysis of data using Generalized Additive Models (GAM) showed that up to 62% of the temporal variability in average MPB NDVI, peaking in late wet and early dry seasons (November-December), can be explained by years and months. The high temperatures and irradiance during the dry season (December to April) in the Nicoya estuary may inhibit MPB growth, contrasting with patterns observed in temperate estuaries. We observed higher MPB NDVI in the upper intertidal zone (mean sea level > 0.5 m) as usually occurs in temperate estuaries. This research highlights the importance of high-resolution satellite imagery for long-term monitoring of MPB dynamics in tropical tidal flats, crucial for accurate evaluation of global carbon cycling and ecosystem services. © 2024, The Authors. All rights reserved.

关键词： Remote sensing

来源：评论

学校读者我要写书评

暂无评论

Offsite Evaluation of Localization Systems: Criteria, Systems, and Results From IPIN 2021 and 2022 Competitions

IEEE Journal on Indoor and Seamless Positioning and Navigati...

引用

IEEE Journal on Indoor and Seamless Positioning and Navigation 2024年 2卷 92-129页

作者： Potorti, Francesco Crivello, Antonino Lee, Soyeon Vladimirov, Blagovest Park, Sangjoon Chen, Yushi Wang, Long Chen, Runze Zhao, Fang Zhuge, Yue Luo, Haiyong Perez-Navarro, Antoni Jimenez, Antonio R. Wang, Han Liang, Hengyi De Cock, Cedric Plets, David Cui, Yan Xiong, Zhi Li, Xiaodong Ding, Yiming Franco, Fernando Javier Alvarez Polo, Fernando Jesus Aranda Rodriguez, Felipe Parralejo Moreira, Adriano Pendao, Cristiano Silva, Ivo Ortiz, Miguel Zhu, Ni Li, Ziyou Renaudin, Valerie Wei, Dongyan Ji, Xinchun Zhang, Wenchao Wang, Yan Ding, Longyang Kuang, Jian Zhang, Xiaobing Dou, Zhi Yang, Chaoqun Kram, Sebastian Stahlke, Maximilian Mutschler, Christopher Coene, Sander Li, Chenglong Venus, Alexander Leitinger, Erik Tertinek, Stefan Witrisal, Klaus Wang, Yi Wang, Shaobo Jin, Beihong Zhang, Fusang Su, Chang Wang, Zhi Li, Siheng Li, Xiaodong Li, Shitao Pan, Mengguan Zheng, Wang Luo, Kai Ma, Ziyao Gao, Yanbiao Chang, Jiaxing Ren, Hailong Guo, Wenfang Torres-Sospedra, Joaquin Pisa56124 Italy Electronics and Telecommunications Research Institute Daejeon34129 Korea Republic of Beijing University of Posts and Telecommunications School of Computer Science National Pilot Software Engineering School Beijing100876 China Chinese Academy of Sciences Beijing Key Laboratory of Mobile Computing and Pervasive Device Institute of Computing Technology Beijing100190 China Universitat Oberta de Catalunya Faculty of Computer Sciences Multimedia and Telecommunication Barcelona08035 Spain Arganda del Rey28500 Spain Huawei Technologies Company Ltd. Shenzhen100015 China IMEC-WAVES/Ghent University Department of Information Technology Gent9052 Belgium Nanjing University of Aeronautics and Astronautics College of Automation Nanjing210016 China University of Extremadura Badajoz06006 Spain University of Trás-os-Montes and Alto Douro Department of Engineering School of Sciences and Technology Vila Real5000-801 Portugal Universidade Do Minho Centro Algoritmi Guimarães4800-058 Portugal Ame Department of the University Gustave Eiffel Geoloc Laboratory Bouguenais44344 France Chinese Academy of Sciences Aerospace Information Research Institute Beijing100094 China Wuhan University Gnss Research Center Wuhan430072 China AutoNavi Software Company Ltd. China Fraunhofer Institute for Integrated Circuits Iis Fraunhofer Iis Nuremberg90411 Germany Erlangen91058 Germany Graz University of Technology Christian Doppler Laboratory for Location-Aware Electronic Systems Graz8010 Austria Institute of Software Chinese Academy of Sciences Beijing100190 China Purple Mountain Laboratories Pervasive Communication Research Center Nanjing210000 China Beijing University of Posts and Telecommunications Beijing100876 China

Indoor positioning is a thriving research area, which is slowly gaining market momentum. Its applications are mostly customized, ad hoc installations;ubiquitous applications analogous to Global Navigation Satellite System for outdoors are not available because of the lack of generic platforms, widely accepted standards and interoperability protocols. In this context, the indoor positioning and indoor navigation (IPIN) competition is the only long-term, technically sound initiative to monitor the state of the art of real systems by measuring their performance in a realistic environment. Most competing systems are pedestrian-oriented and based on the use of smartphones, but several competing tracks were set up, enabling comparison of an array of technologies. The two IPIN competitions described here include only off-site tracks. In contrast with on-site tracks where competitors bring their systems on-site - which were impossible to organize during 2021 and 2022 - in off-site tracks competitors download prerecorded data from multiple sensors and process them using the EvaalAPI, a real-time, web-based emulation interface. As usual with IPIN competitions, tracks were compliant with the EvAAL framework, ensuring consistency of the measurement procedure and reliability of results. The main contribution of this work is to show a compilation of possible indoor positioning scenarios and different indoor positioning solutions to the same problem. © 2023 CCBY.

关键词： Smartphones

来源：评论

学校读者我要写书评

暂无评论

ViTAS: Vision Transformer Architecture Search

arXiv

引用

arXiv 2021年

作者： Su, Xiu You, Shan Xie, Jiyang Zheng, Mingkai Wang, Fei Qian, Chen Zhang, Changshui Wang, Xiaogang Xu, Chang School of Computer Science Faculty of Engineering The University of Sydney Australia SenseTime Research Department of Automation THUAI BNRist Tsinghua University China Beijing University of Posts and Telecommunications China University of Science and Technology of China China The Chinese University of Hong Kong Hong Kong

Vision transformers (ViTs) inherited the success of NLP but their structures have not been sufficiently investigated and optimized for visual tasks. One of the simplest solutions is to directly search the optimal one via the widely used neural architecture search (NAS) in CNNs. However, we empirically find this straightforward adaptation would encounter catastrophic failures and be frustratingly unstable for the training of superformer. In this paper, we argue that since ViTs mainly operate on token embeddings with little inductive bias, imbalance of channels for different architectures would worsen the weight-sharing assumption and cause the training instability as a result. Therefore, we develop a new cyclic weight-sharing mechanism for token embeddings of the ViTs, which enables each channel could more evenly contribute to all candidate architectures. Besides, we also propose identity shifting to alleviate the many-to-one issue in superformer and leverage weak augmentation and regularization techniques for more steady training empirically. Based on these, our proposed method, ViTAS, has achieved significant superiority in both DeiT- and Twins-based ViTs. For example, with only 1.4G FLOPs budget, our searched architecture has 3.3% ImageNet-1k accuracy than the baseline DeiT. With 3.0G FLOPs, our results achieve 82.0% accuracy on ImageNet-1k, and 45.9% mAP on COCO2017 which is 2.4% superior than other ViTs. Copyright © 2021, The Authors. All rights reserved.

关键词： 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：