检索结果-内蒙古大学图书馆

arXiv 2017年

作者： Brodutch, Aharon Marchildon, Ryan Helmy, Amr S. Edward S. Rogers Department of Electrical and Computer Engineering University of Toronto 10 King’s College Road TorontoONM5S 3G4 Canada Center for Quantum Information and Quantum Control 60 St George St. TorontoOntrarioM5S 1A7 Canada Department of Physics University of Toronto 60 St George St. TorontoOntrarioM5S 1A7 Canada

We present a modular design for integrated programmable multimode sources of arbitrary Gaussian states of light. The technique is based on current technologies, in particular recent demonstrations of on-chip photon manipulation and the generation of highly squeezed vacuum states in semiconductors. While the design is generic and independent of the choice of integrated platform, we adopt recent experimental results on compound semiconductors as a demonstrative example. Such a device would be valuable as a source for many quantum protocols that range from imaging to communication and information processing. Copyright © 2017, The Authors. All rights reserved.

关键词： Timing circuits

来源：评论

学校读者我要写书评

暂无评论

Time-scaling non-vibrato musical tones while preserving timbral texture

引用

Proceedings of Meetings on Acoustics 2017年第1期31卷

作者： An Zhao James W. Beauchamp 1Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA anzhao2@illinois.edu 2Department of Electrical and Computer Engineering & School of Music University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA jwbeauch@illinois.edu

Sounds produced by linear stretching of nonvibrato single tones fail to preserve their original microvariations. While looping is commonly used for elongation with wavetable synthesis, this method requires careful attention to periodic waveform boundaries. Time extension by time reversal ensures continuity in the time domain, but this method causes audible clicks due to waveform phase reversals. This problem is overcome by using a pitch-synchronous phase vocoder method that generates time- varying harmonic amplitude and frequency envelopes. Applying a time-reversal “zig-zag” method to these envelopes and converting to the time domain via sinusoidal additive synthesis generates elongated versions of the original sound without audible clicks. To retain realism, original attack and decay time data are preserved. For shortening, envelopes are cross-faded between the attack-end and decay-begin points. In addition, for sounds having significant rendering of expression via harmonic amplitude changes, smooth amplitude contours are separated from high frequency microvariations, where the former are elongated by linear interpolation and the latter are elongated by the zig-zag method. As an application, the time-scaling algorithm has been implemented in a score-processing music synthesis program.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Robustness of uncertain discrete linear repetitive processes with disturbance attenuation

Robustness of uncertain discrete linear repetitive processes...

引用

2016 European control Conference, ECC 2016

作者： Dabkowski, Pawel Galkowski, Krzysztof Rogers, Eric Sebek, Michael Institute of Physiscs Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University ul. Grudziadzka 5 Torun87-100 Poland Institute of Control and Computation Engineering University of Zielona Gora Podgorna 50 Zielona Gora65-246 Poland Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Technicka 2 Praha 616627 Czech Republic

ISBN: (纸本)9781509025916

Repetitive processes are a class of 2D systems that can be used to model physical systems and also there are applications, such as iterative learning control, where using a repetitive processes setting for design has advantages over alternatives. In most cases, it is discrete dynamics that are basis for design and often there will be a need to deal with uncertainty in the process model and the effects of disturbances. This paper develops new algorithms for these tasks that are computed using linear matrix inequalities when the uncertainty is modeled using two standard representations and disturbance attenuation is measured by an norm. The extension of these algorithms to control law design is also developed. © 2016 EUCA.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Simple adaptive control for quadcopters with saturated actuators

引用

AIP Conference Proceedings 2017年第1期1798卷

作者： Oleg I. Borisov Alexey A. Bobtsov Anton A. Pyrkin Vladislav S. Gromov 1Department of Control Systems and Informatics ITMO University Kronverkskiy pr. 49 St. Petersburg 197101 Russia 2Laboratory “Control of Complex Systems” Institute for Problems of Mechanical Engineering Bolshoy pr. 61 St. Petersburg 199178 Russia

The stabilization problem for quadcopters with saturated actuators is considered. A simple adaptive output control approach is proposed. The control law “consecutive compensator” is augmented with the auxiliary integral loop and anti-windup scheme. Efficiency of the obtained regulator was confirmed by simulation of the quadcopter control problem.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Link connectivity under more realistic channel model for vehicle-to-vehicle communications

Link connectivity under more realistic channel model for veh...

引用

作者： Chen, Ruifeng Zhong, Zhangdui Leung, Victor C.M. Michelson, David G. Institute of Computing Technologies China Academy of Railway Sciences Beijing100081 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Department of Electrical and Computer Engineering University of British Columbia VancouverV6T1Z4 Canada

Since the antennas are very low in vehicle-to-vehicle (V2V) scenarios, the communication link is easily blocked by other vehicles. The shadowing effect caused by other vehicles has been ignored in most of the existingV2Vchannel models, and it is thus neglected in the system performance evaluation. By incorporating channel state transition with a measurement-based dual-slope path loss model, an obstacle-based model is presented in this paper for the V2V highway scenarios to capture the dynamic characteristics of radio channels, in the presence of other vehicles as moving obstacles. The joint effects of the radio environment and traffic flowon link connectivity are mainly investigated. The obstruction probability is represented, and the connectivity-related metrics are evaluated: inter- vehicle connectivity probability and link duration. All the analytical results are validated by extensive simulations under the measurement-based path loss model, and are also compared to the existing models. © Copyright 2016 Inderscience Enterprises Ltd.

关键词： Vehicle to vehicle communications

来源：评论

学校读者我要写书评

暂无评论

Nonlinear current-limiting control for grid-tied inverters

Nonlinear current-limiting control for grid-tied inverters

引用

American control Conference

作者： Qing-Chang Zhong George C. Konstantopoulos Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago 60616 USA Department of Automatic Control and Systems Engineering The University of Sheffield S1 3JD U.K.

ISBN: (纸本)9781467386838

A current-limiting controller with nonlinear dynamics is proposed in this paper for single-phase grid-tied inverters. The inverter is connected to the grid through an LCL filter and it is proven that the proposed controller can achieve accurate real and reactive power regulation. By suitably selecting the controller parameters, it is shown by using the nonlinear input-to-state stability theory that the inverter current remains below a given value at all times. This is achieved without external limiters, additional switches or monitoring devices and the controller remains a continuous-time system guaranteeing the boundedness of the system states. Guidelines for selecting the controller parameters are also given to provide a complete controller design procedure. Simulation results of a single-phase grid-tied inverter are presented to verify the desired power regulation of the proposed controller and its current-limiting capability.

关键词： Inverters Stability analysis Power system stability Reactive power Closed loop systems Asymptotic stability Nonlinear dynamical systems

来源：评论

学校读者我要写书评

暂无评论

Bifurcation in the chemotactic behavior of Physarum plasmodium

引用

AIP Conference Proceedings 2017年第1期1863卷

作者： Tomohiro Shirakawa Yukio-Pegio Gunji Hiroshi Sato Hiroto Tsubakino 1Department of Computer Science School of Electrical and Computer Engineering National Defense Academy of Japan 1-10-20 Hashirimizu Yokosuka Kanagawa 239-8686 Japan 2Department of Intermedia Studies Graduate School of Fundamental Science and Engineering Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo 169-8555 Japan 3Department of Intermedia Art and Science School of Fundamental Science and Engineering Waseda University 3-4-1 Okubo Shinjuku-ku Tokyo 169-8555 Japan

The plasmodium of true slime mold Physarum polycephalum is a unicellular and multinuclear giant amoeba. Since the cellular organism has some computational abilities, it is attracting much attention in the field of information science. However, previous studies have mainly focused on the optimization behavior of the plasmodium for a single-modality stimulus, and there are few studies on how the organism adapts to multi-modal stimuli. We stimulated the plasmodium with mixture of attractant and repellent stimuli, and we observed bifurcation in the chemotactic behavior of the plasmodium.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Convergence rate of the modified differential evolution algorithm

引用

AIP Conference Proceedings 2017年第1期1910卷

作者： Roman Knobloch Jaroslav Mlynek Radek Srb 1Department of Mathematics FP Technical University of Liberec Studentska 2 461 17 Liberec The Czech Republic 2)Institute of Mechatronics and Computer Engineering Technical University of Liberec Studentska 2 461 17 Liberec The Czech Republic

Differential evolution algorithms represent an efficient framework to solve complicated optimization tasks with many variables and complex constraints. Nevertheless, the classic differential evolution algorithm does not guarantee the convergence to the global minimum of the cost function. Therefore, the authors developed a modification of this algorithm that ensures asymptotic global convergence. The article provides a comparison of the ability to identify the global minimum of the cost function for the following three algorithms: the classic differential evolution algorithm, the above mentioned modified differential evolution algorithm and an algorithm of random sampling enhanced by a hill climbing procedure. We designed a series of numerical experiments to perform this comparison. The results indicate that the classic differential evolution algorithm is in general an extremely poor global optimizer (global minimum found in 2% of cases). On the other hand the performance of the modified differential evolution algorithm was considerably better (global minimum found in 83% of cases).

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nonlinear control of dc/dc power converters with inherent current and power limitation

Nonlinear control of dc/dc power converters with inherent cu...

引用

Mediterranean Conference on control and Automation

作者： George C. Konstantopoulos Qing-Chang Zhong Department of Automatic Control and Systems Engineering The Univesity of Sheffield Sheffield S1 3JD U.K Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL 60616 USA

ISBN: (纸本)9781467383479

A nonlinear controller with an inherent current-limiting capability is presented in this paper for different types of dc/dc power converters (boost, buck-boost). The proposed controller is based on the idea of applying a dynamic virtual resistance in series with the inductor of the converter, which varies according to a nonlinear dynamical system. It is shown that the proposed approach acts independently from the converter parameters (inductance, capacitance) or the load and has a generic structure that can be used to achieve different regulation scenarios, e.g. voltage, current or power regulation. Based on the nonlinear model of the boost and the buck-boost converter, it is analytically proven that the inductor current remains always bounded below a given maximum value using input-to-state stability theory under a suitable choice of the controller parameters. Hence, the proposed control strategy offers an inherent protection property since the power of the converter is limited below a given value during transients or unrealistic power demands. Simulation results for both types of dc/dc converters are presented to verify the desired controller performance.

关键词： Inductors Voltage control Resistance Nonlinear dynamical systems Load modeling Stability analysis Transient analysis Nonlinear dynamical systems inductors Load modeling Voltage regulation Transient analysis Converters Stability analysis nonlinear control power conversion unit Energy sources Series Resistance controllers boost converters series inductor stability theory

来源：评论

学校读者我要写书评

暂无评论

Enhancing quantum control by bootstrapping a quantum processor of 12 qubits

arXiv

引用

arXiv 2017年

作者： Lu, Dawei Li, Keren Li, Jun Katiyar, Hemant Park, Annie Jihyun Feng, Guanru Xin, Tao Li, Hang Long, Guilu Brodutch, Aharon Baugh, Jonathan Zeng, Bei Laflamme, Raymond Department of Physics Southern University of Science and Technology Shenzhen518055 China Institute for Quantum Computing Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Beijing Computational Science Research Center Beijing100193 China Max-Planck-Institutfür Quantenoptik GarchingD-85748 Germany Center for Quantum Information and Quantum Control Department of Physics Department of Electrical and Computer Engineering University of Toronto TorontoONM5S 3H6 Canada Department of Mathematics and Statistics University of Guelph GuelphONN1G 2W1 Canada Perimeter Institute for Theoretical Physics Waterloo ONN2L 2Y5 Canada

Accurate and efficient control of quantum systems is one of the central challenges for quantum information processing. Current state-of-the-art experiments rarely go beyond 10 qubits and in most cases demonstrate only limited control. Here we demonstrate control of a 12-qubit system, and show that the system can be employed as a quantum processor to optimize its own control sequence by using measurement-based feedback control (MQFC). The final product is a control sequence for a complex 12-qubit task: preparation of a 12-coherent state. The control sequence is about 10% more accurate than the one generated by the standard (classical) technique, showing that MQFC can correct for unknown imperfections. Apart from demonstrating a high level of control over a relatively large system, our results show that even at the 12-qubit level, a quantum processor can be a useful lab instrument. As an extension of our work, we propose a method for combining the MQFC technique with a twirling protocol, to optimize the control sequence that produces a desired Clifford gate. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum optics

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：