检索结果-内蒙古大学图书馆

A tree detection method based on trunk point cloud section in dense plantation forest using drone Li DAR data

Forest Ecosystems 2023年第1期10卷 37-45页

作者： Yupan Zhang Yiliu Tan Yuichi Onda Asahi Hashimoto Takashi Gomi Chenwei Chiu Shodai Inokoshi Center for Research in Isotopes and Environmental Dynamics University of Tsukuba1-1-1TennodaiTsukubaIbaraki305-8572Japan Graduate School of Systems and Information Engineering University of Tsukuba1-1-1TennodaiTsukubaIbaraki305-8572Japan Department of International Environmental and Agricultural Science Tokyo University of Agriculture and Technology3-5-8SaiwaieFuchuTokyo183-8509Japan

Single-tree detection is one of the main research topics in quantifying the structural properties of forests. Drone Li DAR systems and terrestrial laser scanning systems produce high-density point clouds that offer great promise for forest inventories in limited areas. However, most studies have focused on the upper canopy layer and neglected the lower forest structure. This paper describes an innovative tree detection method using drone Li DAR data from a new perspective of the under-canopy structure. This method relies on trunk point clouds, with undercanopy sections split into heights ranging from 1 to 7 m, which were processed and compared, to determine a suitable height threshold to detect trees. The method was tested in a dense cedar plantation forest in the Aichi Prefecture, Japan, which has a stem density of 1140 stems·ha^(-1) and an average tree age of 42 years. Dense point cloud data were generated from the drone Li DAR system and terrestrial laser scanning with an average point density of 5000 and 6500 points·m^(-2), respectively. Tree detection was achieved by drawing point-cloud section projections of tree trunks at different heights and calculating the center coordinates. The results show that this trunk-section-based method significantly reduces the difficulty of tree detection in dense plantation forests with high accuracy(F1-Score=0.9395). This method can be extended to different forest scenarios or conditions by changing section parameters.

关键词： Tree detection Trunk sections Forest Drone LiDAR

来源：评论

学校读者我要写书评

暂无评论

Continuous Strain Profiling with Low-Coherence Brillouin Optical Correlation-Domain Reflectometry

Continuous Strain Profiling with Low-Coherence Brillouin Opt...

引用

CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

作者： Noda, Kohei Sugihara, Rei Sadachika, Shinya Takata, Atsushi Nakamura, Kentaro Mizuno, Yosuke Endo, Gen Set, Sze Yun Yamashita, Shinji Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo Japan Department of Mechanical Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo Japan Department of Mechanical Systems Engineering Tokyo University of Agriculture and Technology 2-24-16 Naka-cho Tokyo Japan Institute of Innovative Research Tokyo Institute of Technology Nagatsuta-cho Midori-ku Yokohama4259 Japan Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama Japan Research Center for Advanced Science and Technology The University of Tokyo 4-6- Komaba Meguro-ku Tokyo Japan

We experimentally measure a continuous strain distribution using low-coherence Brillouin optical correlation-domain reflectometry, which suppresses the noise caused by the sidelobes of a beat spectrum of conventional ... 详细信息

关键词： Optical depth

来源：评论

学校读者我要写书评

暂无评论

Dynamic Analysis and control of Fractional Order Memristor Hopfield Neural Network 42

Dynamic Analysis and Control of Fractional Order Memristor H...

引用

42nd Chinese control Conference, CCC 2023

作者： Liu, Feng Cai, Gang Zhou, Feifan Wang, Wei Wang, Hua Yang, Xiuqin School of Automation China University of Geosciences Wuhan430074 China Engineering Research Center of Ministry of Education for Intelligent Technology of Earth Exploration China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan4300748 China Boston University Department of Mechanical Engineering BostonMA02215 United States School of Education Minzu University of China Beijing100081 China

ISBN: (纸本)9789887581543

In this paper, a novel smooth magnetron is introduced to construct a fractional memristor Hopfield neural network (fractional order M-HNN). The local stability of equilibrium point are analyzed theoretically. Taking the memristor coupling strength coefficient and the fractional order as bifurcation parameters, the phase trajectory diagram, the bifurcation diagram of the system are drawn to analyze the influence on the dynamic behavior of the neural network. When the system parameters are fixed, the hyperchaos phenomenon of the fractional order M-HNN model is revealed. Finally, the PD controller is applied to the model to enhance the stability of the system. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Hopfield neural networks

来源：评论

学校读者我要写书评

暂无评论

Stability and Bifurcation control of Fractional-Order Coupled Hindmarsh-Rose Neural Networks 42

Stability and Bifurcation Control of Fractional-Order Couple...

引用

42nd Chinese control Conference, CCC 2023

作者： Liu, Feng Zhou, Feifan Wang, Wei Cai, Gang Wang, Hua O Yang, Xiuqin School of Automation China University of Geosciences Wuhan430074 China Engineering Research Center of Ministry of Education for Intelligent Technology of Earth Exploration China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China Boston University Department of Mechanical Engineering BostonMA02215 United States School of Education Minzu University of China Beijing100081 China

ISBN: (纸本)9789887581543

This article investigates a fractional-order coupled Hindmarsh-Rose neural networks model. Firstly, the existence and stability of an equilibrium point in the system are verified. Then, the periodic bifurcation behavior of the system on a two-parameter plane is studied, and numerical simulations show the existence of both non -chaotic and chaotic plus periodic bifurcation behavior on the two-parameter plane. Finally, a feedback controller was designed to stabilize the bifurcation point of the delayed system and increase the stable range of the system. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Neural network models

来源：评论

学校读者我要写书评

暂无评论

Carbon-Aware Computing in a Network of Data Centers: A Hierarchical Game-Theoretic Approach

Carbon-Aware Computing in a Network of Data Centers: A Hiera...

引用

European control Conference (ECC)

作者： Enno Breukelman Sophie Hall Giuseppe Belgioioso Florian Dörfler Division of Decision and Control Systems KTH Royal Institute of Technology School of Electrical Engineering and Computer Science Stockholm Sweden Department of Electrical Engineering and Information Technology Automatic Control Laboratory ETH Zurich Zürich Switzerland

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

Over the past decade, the continuous surge in cloud computing demand has intensified data center workloads, leading to significant carbon emissions and driving the need for improving their efficiency and sustainability. This paper focuses on the optimal allocation problem of batch compute loads with temporal and spatial flexibility across a global network of data centers. We propose a bilevel game-theoretic solution approach that captures the inherent hierarchical relationship between supervisory control objectives, such as carbon reduction and peak shaving, and operational objectives, such as priority-aware scheduling. Numerical simulations with real carbon intensity data demonstrate that the proposed approach success-fully reduces carbon emissions while simultaneously ensuring operational reliability and priority-aware scheduling.

关键词： Data centers Processor scheduling Computational modeling Carbon dioxide Games Supervisory control Resource management

来源：评论

学校读者我要写书评

暂无评论

A Cyclic Small Phase Theorem for Nonlinear systems

A Cyclic Small Phase Theorem for Nonlinear Systems

引用

IEEE Conference on Decision and control

作者： Chao Chen Jianqi Chen Di Zhao Li Qiu STADIUS center of Department of Electrical Engineering (ESAT) KU Leuven Leuven Belgium Center for Advanced Control and Smart Operations Nanjing University Suzhou China Department of Control Science and Engineering & Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Shenzhen China

ISBN: (数字)9798350316339

ISBN: (纸本)9798350316346

A new definition of phase, called the γ-segmental phase, is proposed for stable nonlinear systems from an input-output perspective. The definition is graphically established upon a disk segment covering the normalized numerical range of a nonlinear system plotted in the unit disk. The Hilbert transform is employed which acts as an enabling instrument for complexifying real-valued input-output trajectories of a system. A small phase stability criterion is developed for a cyclic feedback system consisting of multiple subsystems, namely, \begin{equation*}\Psi_{\gamma_systems}\left(\boldsymbol{P}_systems\right)+\Psi_{\gamma_systems}\left(\boldsymbol{P}_systems\right)+\cdots+\Psi_{\gamma_{m}}\left(\boldsymbol{P}_{m}\right) \subset(-\pi, \pi)\end{equation*} where the interval-valued $\Psi_{\gamma}(\cdot)$ denotes the γ-segmental phase of a system. The proposed criterion can be regarded as a phase counterpart to the monumental small gain theorem.

关键词： Linear systems Instruments Frequency-domain analysis Stability criteria Transforms Trajectory Nonlinear systems Numerical stability

来源：评论

学校读者我要写书评

暂无评论

Variable Multi-Band Metasurface Reflector with controllable Direction Using Varactor Diodes Mounted Large-Via Mushroom-Type Structure

Variable Multi-Band Metasurface Reflector with Controllable ...

引用

European Conference on Antennas and Propagation, EuCAP

作者： Taisei Urakami Tamami Maruyama Akira Ono Na Chen Minoru Okada Graduate School of Science and Technology Nara Institute of Science and Technology Japan Department of Production Systems Engineering National Institute of Technology Hakodate College Japan Department of Communication Network Engineering National Institute of Technology Kagawa College Japan

Reconfigurable metasurface reflectors, which are key components of the intelligent reflecting surface (IRS) have recently been considered as the countermeasures for the coverage hole problem in the fifth- and sixth-generation (5G/6G) mobile communication systems. In this paper, a novel varactor diodes mounted large-via mushroom-type (VDLM) structure with a wide reflection phase range is proposed to realize the variable multi-band metasurface reflector with controllable direction. Specifically, two varactor diodes for controlling the reflection direction and frequency band are mounted on the unit cell of the metasurface. In addition, the proposed VDLM structure consists of a large grounding conductor cylinder (large-via) to expand the reflection phase range, and mitigate the influence of the design gap that is caused between each frequency. According to our electromagnetic simulation results, the reflector with the proposed VDLM structure could control the reflection direction at selected frequency with a low sidelobe suppression ratio.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ancestral-Path Descendant-Labels Histogram Distance for Rooted Labeled Trees

Ancestral-Path Descendant-Labels Histogram Distance for Root...

引用

IIAI International Conference on advanced Applied Informatics (IIAIAAI)

作者： Daisuke Abe Kouichi Hirata Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan Department of Artificial Intelligence Kyushu Institute of Technology Iizuka Japan

ISBN: (数字)9798350377903

ISBN: (纸本)9798350377910

In order to compare rooted labeled trees (trees, for short), in this paper, we introduce an ancestral-path descendant-labels (APDL, for short) histogram distance as the $L_{1}$ distance between histograms of triples consisting of the path from the root to $v$ , the label of $v$ and the multiset of labels in the descendant of $v$ for every vertex $v$ . Then, we show that the APDL histogram distance can be computed in linear time with respect to the number of vertices in trees and it is a metric. Furthermore, we compare APDL histogram distance with the isolated-subtree distance for real data.

关键词： Measurement Histograms Informatics

来源：评论

学校读者我要写书评

暂无评论

Markovian lifting and asymptotic log-Harnack inequality for stochastic Volterra integral equations

arXiv

引用

arXiv 2023年

作者： Hamaguchi, Yushi Graduate School of Engineering Science Department of Systems Innovation Osaka University 1-3 Machikaneyama Osaka Toyonaka Japan

We introduce a new framework of Markovian lifts of stochastic Volterra integral equations (SVIEs for short) with completely monotone kernels. We define the state space of the Markovian lift as a separable Hilbert space which incorporates the singularity or regularity of the kernel into the definition. We show that the solution of an SVIE is represented by the solution of a lifted stochastic evolution equation (SEE for short) defined on the Hilbert space and prove the existence, uniqueness and Markov property of the solution of the lifted SEE. Furthermore, we establish an asymptotic log-Harnack inequality and some consequent properties for the Markov semigroup associated with the Markovian lift via the asymptotic coupling *** Codes 60H20, 60H15, 60G22, 37A25 © 2023, CC BY.

关键词： Hilbert spaces

来源：评论

学校读者我要写书评

暂无评论

Development of an Autonomous Navigation System for Small Vessels Using Remote control

Development of an Autonomous Navigation System for Small Ves...

引用

Electrical, Computer and Energy Technologies (ICECET), International Conference on

作者： Ayoung Yang Atushi Ishibashi Ryota Imai Tadasuke Furuya Graduate School of Marine Science and Technology Tokyo University of Marine Science and Technology Tokyo Japan Department of Maritime Systems Engineering Tokyo University of Marine Science and Technology Tokyo Japan

ISBN: (数字)9798350395914

ISBN: (纸本)9798350395921

Research on autonomous ships is being vigorously pursued globally. The International Maritime Organization (IMO) is leading a phased approach to the development of unmanned large ships. In contrast, the development of small ships is progressing independently in countries with a robust recreational maritime culture, focusing on innovative hull designs and systems. The small ship market is distinguished by high rates of used vessel purchases, a preference for cost-effectiveness, and a general lack of navigational aids compared to larger vessels. Furthermore, small ships are often operated by amateurs rather than professional navigators. These market characteristics suggest that the adoption of small autonomous ships will likely lag behind that of larger vessels. In response, our research aims to develop an economical program that enables autonomous operations in existing small ships or provides navigational assistance to inexperienced operators. Initially, we identified the necessary technology and economical equipment required to retrofit existing small ships for autonomous functionality. Subsequently, we analyzed the vessel's motion model to determine suitable control parameters. A straightforward control method was selected to facilitate user comprehension of the ship's status and interaction with the autonomous program. Our goal is to allow users to grasp the ship's motion dynamics through devices designed for autonomous navigation and to effectively implement navigational programs.

关键词： Navigation Dynamics Organizations Sensor systems Recycling Marine vehicles Autonomous vehicles Remote control Autonomous robots Logistics

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：