检索结果-内蒙古大学图书馆

IEEE International Conference on Communications

作者： J. D. Ashdown G. J. Saulnier T. J. Lawry K. R. Wilt H. A. Scarton S. Pascarelle J. D. Pinezich Electrical Computer and Systems Engineering Dept. Rensselaer Polytechnic Institute Mechanical Aerospace and Nuclear Engineering Dept. Rensselaer Polytechnic Institute Advanced Acoustic Concepts

ISBN: (纸本)9781457720529

This paper explores the use of multiple communication channels to transmit data at high rates, without physical penetrations, through thick metallic barriers using ultrasound. Two parallel acoustic-electric channels are formed in close proximity utilizing two pairs of coaxially aligned piezoelectric transducers mounted on, and acoustically coupled to, opposing sides of a metal wall. Each channel employs orthogonal frequency division multiplexing (OFDM) which can achieve a high spectral efficiency in frequency selective channels. The two-transmitter-two-receiver MIMO configuration is studied and analytical expressions of channel capacity are determined for the raw channels as well as for several co-channel interference cancellation techniques and they are verified using a Monte-Carlo simulation. It is shown that excessive crosstalk between the channels can lead to marginal increases or decreases in capacity over the single channel when no interference suppression is used. Several interference cancellation structures, including zero forcing, eigenmode transmission, and minimum mean-square error (MMSE) are investigated to mitigate this effect. It is shown that their aggregate capacity may approximately double that of either channel used independently. It is also determined that, in a relatively static MIMO acoustic-electric channel, a minimal complexity adaptive approach such as the Least Mean Squares (LMS) algorithm may be used while achieving a similar capacity to more complex structures.

关键词： metal curtain wall suppression of interference aggregate capacity Orthogonal frequency division multiplexing Piezoelectric transducers data communication single-channel spectral efficiency complex structure Monte Carlo technique Channel capacity Acoustics multiple input multiple output systems Least mean square algorithm

来源：评论

学校读者我要写书评

暂无评论

Combining gait research of the quadruped/biped reconfigurable walking chair with parallel leg mechanism

引用

4th International Conference on Social Robotics, ICSR 2012

作者： Hu, Xing Wang, Hongbo Sang, Lingfeng Gu, Qifang Yuan, Lin School of Mechanical and Electrical Engineering Xi'an University of Architecture and Technology Xi'an Shanxi 710055 China Ministry of Education Key Laboratory of Advanced Forging Technology and Science Hebei Province Key Laboratory of Parallel Robot and Mechatronics Systems Yanshan University Qinhuangdao Hebei 066004 China Department of Computer Wuxi City College of Vocational Technology Wuxi 214063 China

ISBN: (纸本)9783642341021

The quadruped/biped reconfigurable walking robot with parallel leg mechanism can realize not only the quadruped walking, but also the biped walking. The converting process from the quadruped to the biped includes locking the vertical revolute pair hinged with the upper platform and combining the corresponding lower platforms. Based on the previous study, the combining schemes of walking chair are researched in this paper, and then the correctness of the combining schemes is analyzed by using the position workspace of the swing leg and the body mechanism in different states which are obtained by the MATLAB software and anti-solution search method. Compared with the stability margin and the adjustment coordination of the body in the different combining schemes, the optimal combining gaits of walking chair are selected, which lays the theoretical foundation for the quadruped/biped converting control of walking chair. © 2012 Springer-Verlag.

关键词： MATLAB

来源：评论

学校读者我要写书评

暂无评论

Overcoming Occlusions in Eye-in-Hand Visual Search

Overcoming Occlusions in Eye-in-Hand Visual Search

引用

American Control Conference

作者： Sina Radmard David Meger Elizabeth A. Croft James J. Little Collaborative Advanced Robotics and Intelligent Systems Laboratory Mechanical Engineering Department University of British Columbia V6T1Z4 Canada Laboratory for Computational Intelligence Department of Computer Science University of British Columbia V6T1Z4 Canada

ISBN: (纸本)9781457710957

In this paper we propose a method for handling persistent visual occlusions that disrupt visual tracking for eye-in-hand systems. This approach provides an efficient strategy for the robot to "look behind" the occlusion while respecting the robot's physical constraints. Specifically, we propose a decoupled search strategy combining a naive pan tilt search with a sensor placement approach, to reduce the strategy's computational cost. We proceed by mapping limited environmental data into the robot configuration space and then planning within a constrained region. We use a particle filter to continuously estimate the target location, while our configuration-based cost function plans a goal location for the camera frame, taking into account robot singularity, self-collision and joint limit constraints. To validate our algorithm, we implemented it on an eye-in-hand robot system. Experimental results for various situations support the feasibility of our approach for quickly recovering fully occluded moving targets. Finally we discuss the implications of this approach to mobile robot platforms.

关键词： Joints Cameras Robot vision systems Target tracking Planning

来源：评论

学校读者我要写书评

暂无评论

Multi-Bernoulli filtering with unknown clutter intensity and sensor field-of-view

Multi-Bernoulli filtering with unknown clutter intensity and...

引用

Annual Conference on Information Sciences and systems

作者： Vo, Ba Tuong Vo, Ba Ngu Hoseinnezhad, Reza Mahler, Ronald. P. S. School of Electrical Electronic and Computer Engineering University of Western Australia Crawley WA 6009 Australia School of Aerospace Mechanical and Manufacturing Engineering RMIT University Carlton VIC 3053 Australia Advanced Technology Group Lockheed Martin MS2 Tactical Systems Eagan MN United States

ISBN: (纸本)9781424498475

In Bayesian multi-target filtering knowledge of parameters such as clutter intensity and sensor field-of-view are of critical importance. Significant mismatches in clutter and sensor field of view model parameters results in biased estimates. In this paper we propose a multi-target filtering solution that can accommodate non-linear target model and unknown non-homogeneous clutter intensity and sensor field-of-view. Our solution is based on the multi-target multi-Bernoulli filter that adaptively learns non-homogeneous clutter intensity and sensor field-of-view while filtering. © 2011 IEEE.

关键词： Clutter (information theory)

来源：评论

学校读者我要写书评

暂无评论

Penetration-free system for transmission of data and power through solid metal barriers

Penetration-free system for transmission of data and power t...

引用

MILCOM, Military Communications Conference

作者： T. J. Lawry G. J. Saulnier J. D. Ashdown K. R. Wilt H. A. Scarton S. Pascarelle J. D. Pinezich Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA Mechanical AeroSpace and Nuclear Engineering Department Rensselaer Polytechnic Institute Troy NY USA Advanced Acoustic Concepts Hauppauge NY USA

This paper presents a novel system capable of simultaneous high-power and high data-rate transmission through solid metal barriers using ultrasound. By co-axially aligning a pair of piezoelectric transducers on opposite sides of a metal wall and acoustically coupling them to the barrier, an acoustic-electric transmission channel is formed which prevents the need for physical penetrations. Independent data and power channels are utilized, but they are only separated by 25.4 mm (1 in) to reduce the system's form factor. Commercial off-the-shelf components and evaluation boards are used to create real-time prototype hardware and the full system is capable of transmitting data at 12.4 Mbps and delivering 50 W of power through a 63.5 mm (2.5 in) thick steel wall. A synchronous multi-carrier communication scheme (OFDM) is used to achieve a very high spectral efficiency and to ensure that there is only minor interference between the power and data channels. Also presented is a discussion of many potential enhancements that could be made to greatly improve the power and data-rate capabilities of the system. This system could have a tremendous impact on improving safety and preserving structural integrity in many military applications (submarines, surface ships, UUVs, armored vehicles, planes, etc.) as well as in a wide range of commercial, industrial, and nuclear systems.

关键词： OFDM Throughput Acoustics Transducers Data communication Digital signal processing Receivers

来源：评论

学校读者我要写书评

暂无评论

Multi-Bernoulli filtering with unknown clutter intensity and sensor field-of-view

Multi-Bernoulli filtering with unknown clutter intensity and...

引用

Annual Conference on Information Sciences and systems (CISS)

作者： Ba Tuong Vo Ba Ngu Vo Reza Hoseinnezhad Ronald. P. S. Mahler School of Electrical Electronic and Computer Engineering University of Western Australia Crawley WA Australia School of AeroSpace Mechanical and Manufacturing Engineering RMIT University Carlton VIC Australia Lockheed Martin MS2 Tactical Systems Advanced Technology Group Eagan MN USA

关键词： Clutter Generators Target tracking Approximation methods Noise Adaptation model Noise measurement

来源：评论

学校读者我要写书评

暂无评论

Dynamics of passively phased fiber laser arrays

Dynamics of passively phased fiber laser arrays

引用

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

作者： Jacobo, A. Colet, P. Bochove, E.J. Braiman, Y. Aceves, A.B. Deiterding, R. Miller, C.A. Rhodes, C. Shakir, S.A. UIB-CSIC Palma de Mallorca E07122 Spain Max Planck Institute for the Physics of Complex Systems Nathnitzer Straße 38 01187 Dresden Germany Air Force Research Laboratory Kirtland Air Force Base NM 87117 United States Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN 37831 United States Department of Mathematics Southern Methodist University Dallas TX 75275 United States Department of Mechanical Aerospace and Biomedical Engineering University of Tennessee Knoxville TN 37996 United States Department of Mathematics University of Tennessee Knoxville TN 37996 United States Libration Systems Management Inc. Albuquerque NM 87106 United States TASC Inc. Albuquerque NM 87106 United States

ISBN: (纸本)9781457705335

The goal of scaling fiber lasers to high power levels for applications has created an interest in coherently combine the beams of a number of fibers. However, success in accurately controlling the frequencies and phases of the fields by either passive, active or hybrid means has until now been limited. Studies of the dynamics of passively phased fiber arrays have been published, but the understanding of their instabilities is limited. © 2011 IEEE.

关键词： Fiber lasers

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to “Net energy yield from production of conventional oil” [Energy Policy 39 (11) (2011) 7095–7102]

引用

Energy Policy 2011年第12期39卷 8202-8202页

作者： Michael Dale Susan Krumdieck Pat Bodger Advanced Energy and Material Systems (AEMS) Lab Department of Mechanical Engineering University of Canterbury New Zealand Department of Electrical and Computer Engineering University of Canterbury New Zealand

来源：评论

学校读者我要写书评

暂无评论

Dynamics of passively phased fiber laser arrays.

Dynamics of passively phased fiber laser arrays.

引用

Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： A. Jacobo P. Colet E.J. Bochove Y. Braiman A.B. Aceves R. Deiterding C.A. Miller C. Rhodes S.A. Shakir UlB-CSIC Instituto de Fisica Interdisciplinary Sistemas Complejos (CSIC-UIB) Palma de Mallorca Spain Max Planck Institute Physics of Complex Systems Dresden Germany Directed Energy Directorate Air Force Research Laboratory NM USA Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN USA Department of Mathematics Southern Methodist University Dallas TX USA Department of Mechanical AeroSpace and Biomedical Engineering University of Tennessee Knoxville TN USA Department of Mathematics University of Tennessee Knoxville TN USA Libration Systems Management Inc. Albuquerque NM USA TASC Inc. Albuquerque NM USA

ISBN: (纸本)9781457705328

This paper considers a passively phased array of N rare earth doped fibers that are mutually locked in phase though coherent interaction in a spatially filtering external cavity. By linear stability analysis and numerical simulations, it is shown that, for one fiber, the system has a stable CW regime above threshold, for low pumping powers. Is is also shown that the system can become unstable for high pump intensities first exhibiting pulsating behavior and then becoming chaotic. For two fibers these dynamical regimes the instabilities appear for lower powers as the difference in length between the fibers is increased.

关键词： Fiber lasers High power fiber lasers High power fibers Laser arrays Phased arrays Refractive index

来源：评论

学校读者我要写书评

暂无评论

Electronic Devices on Various Substrates: Fabrication of Releasable Single‐Crystal Silicon–Metal Oxide Field‐Effect Devices and Their Deterministic Assembly on Foreign Substrates (Adv. Funct. Mater. 16/2011)

引用

advanced Functional Materials 2011年第16期21卷

作者： Hyun‐Joong Chung Tae‐il Kim Hoon‐Sik Kim Spencer A. Wells Sungjin Jo Numair Ahmed Yei Hwan Jung Sang Min Won Christopher A. Bower John A. Rogers Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Mechanical Science and Engineering Center for Nanoscale Chemical‐Electrical‐Mechanical Manufacturing Systems University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Electrical and Computer Engineering University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Semprius Inc. 4915 Prospectus Dr. Suite C Durham NC 27713 USA Department of Materials Science and Engineering Chemistry Science and Engineering Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA

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：