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检索条件"主题词=Computer algorithms"

共 3273 条记录，以下是2721-2730 订阅

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Parameterized and Exact Computation 2006

引用

丛书名： Lecture Notes in computer Science

2006年

作者： Hans L. Bodlaender Michael A. Langston

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Safe graph rearrangements for distributed connectivity of robotic networks

Safe graph rearrangements for distributed connectivity of ro...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 5971-6447

作者： Michael Schuresko Jorge Cortes Department of Applied Mathematics and Statistics University of California Santa Cruz CA USA Department of Mechanical and Aerospace Engineering University of California San Diego CA USA

ISBN: (纸本)9781424414970;1424414970

This paper studies distributed algorithms for performing graph rearrangements that preserve the connectivity of a robotic network. Given a connected graph describing the topology of the network, preserving a fixed set of edges while performing a coordination task guarantees that connectivity is maintained. However, the preservation of a fixed set of edges often results in suboptimal and over-constrained robot operation. This paper presents a distributed algorithm to perform graph rearrangements that allow the robotic network to transform its interconnection topology between any two trees. We present a method for composing this algorithm with other control algorithms, and make preference guarantees about the choices of links to be preserved under the resulting composition. We use these ideas to propose a distributed formation morphing algorithm, and characterize its time complexity.

关键词： Network topology distributed algorithms computer algorithms Line graph connectivity Connected graph complexity classes Distribute edges Preserves topology

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Software-Based Hardware-in-the-Loop Real-Time Simulation of Distribution Systems

Software-Based Hardware-in-the-Loop Real-Time Simulation of ...

引用

IEEE Power and Energy Society General Meeting

作者： Saleh Ziaeinejad Ali Mehrizi-Sani School of Electrical Engineering and Computer Science Washington State University

ISBN: (纸本)9781509041695

A major step in the process of designing the controllers of a distribution systems is to test the performance of the controller devices. Testing the controllers with a traditional hardware-based real-time simulator is an effective approach for validation of the controllers. However, it is very costly. This paper introduces a software-based real-time simulator, which is a simple but useful tool for evaluating the controller hardware that will eventually implement the control algorithms in the field. In the proposed structure, the distribution system is simulated in PSCAD (an offline power system simulator) and the control algorithms are implemented in a physical controller hardware. An algorithm is proposed to enforce PSCAD to run in real-time under certain conditions. Therefore, the developed interfacing structure and real-time enforcement scheme provide a hardware-in-the-loop (HIL) real-time simulation tool that can test the performance of controllers in a system. The proposed simulator is validated by several experimental case studies.

关键词： Hardware-in-the-loop real-time simulation LabVIEW Power system simulation PSCAD dispensing system Power Systems computer Aided Design Power system simulation Controllers Laboratory Virtual Instrumentation Engineering Workbenc computer algorithms real-time simulation HARDWARE IN THE LOOP computer hardware

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Priority and Buffer Based Admission Control in Relay-enhanced LTE-A systems

Priority and Buffer Based Admission Control in Relay-enhance...

引用

European Wireless 2013;19th European Wireless Conference

作者： Fasil Tesema Fabrizio Granelli Federica Vitiello Simone Redana University of Trento Nokia Siemens Networks St.

Relay Nodes (RNs) introduction is one of the main features of LTE-Advanced (LTE-A) with the aim of enhancing network coverage and capacity at cell-edge. However, a proper admission control scheme is required to increase the total number of admitted users in the system. This work proposes the implementation and evaluation of three types of admission control schemes taking into account the optimal resource partitioning between RNs and DeNB. The first scheme bases the admission and rejection of users on the resources' availability. The second scheme adds an admission control algorithm based on users' priorities. Finally, the third scheme introduces a dynamic buffer in order to utilize the free resources during the empty arrival periods and to further improve the performance. Performance analysis of the proposed admission control algorithms for different download bit rates and file size is performed through simulations. The optimal buffer configuration that minimizes the probability of unhappy users is determined.

关键词： Relay LTE-Advanced Admission Control Relay Node Admission control Trunk Node relay computer algorithms Long Term Evolution Consumers File Size precedence

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Input Constrained Non-Equilibrium Transient Trajectory Shaping Control for a Class of Nonlinear Systems

Input Constrained Non-Equilibrium Transient Trajectory Shapi...

引用

2010 49th IEEE Conference on Decision and Control

作者： Fengjun Yan Junmin Wang Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 U.S.A.

ISBN: (纸本)9781424477456

In this paper, a non-equilibrium transient trajectory shaping (NETTS) nonlinear control method is presented for a class of single-input-single-output (SISO) strict feedback nonlinear systems, with the control input magnitude and rate of change constraints being considered. Based on a set of Barrier Lyapunov Functions with an input signal constraint pre-estimation mechanism, the non-equilibrium transient trajectory shaping control technique can render the system tracking error transient trajectory travels within a shaped boundary while approaching zero. In such a method, by choosing the chain of barriers and the converging speed properly, the control input magnitude constraint can be met. Control signal continuous approximation and switching buffer size design methods are given as well to accommodate the input rate of change limit. Through a numerical example, the effectiveness of the proposed NETTS control technique is demonstrated by comparisons with different control algorithms.

关键词： computer algorithms Control technology trajectory control input change rate

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Dither Based Precise Position Control of Piezo Actuated Micro-Nano Manipulator

Dither Based Precise Position Control of Piezo Actuated Micr...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Saikat Kumar Shome Sourav Pradhan Arpita Mukherjee Uma Datta E & I Group CSIR-CMERI Dept of Electrical Engg National Institute of Technology Sr Scientist E & I Group CSIR-CMERI

ISBN: (纸本)9781479902255

This paper addresses the problem of hysteresis and presents a new control scheme for hysteresis compensation of piezo-electrically actuated micro-nano manipulators. The technology employs an Inverse Dahl model based feed-forward mechanism in combination with a feedback control algorithm along with simultaneous voltage and displacement dither strategy. The actuator performance is seen to improve as a function of injected noise level into the plant - a phenomenon known as dithering. The notion of stochastic resonance for nano positioning is studied to determine the optimal dither level for efficient plant performance. The efficacy of the proposed control scheme has been confirmed through rigorous simulations in terms of two specific tests - a) tracking error test and b) hysteresis curve area test. Results show an enhanced positioning precision of the manipulator with the proposed dither control than without it. Owing to its algorithmic simplicity, the proposed control genre can be extended to the parlance of other nano-scale applications.

关键词： Stochastic resonance Dahl model Feedback compensation Tracking error Nano positioning dithering Stochastic resonance feedback compensation follow error Position control delay compensation computer algorithms

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Decentralized algorithms for Stochastic and Dynamic Vehicle Routing with General Demand Distribution

Decentralized Algorithms for Stochastic and Dynamic Vehicle ...

引用

Proceedings of the 46th IEEE Conference on Decision and Control, Pages 5971-6447

作者： Marco Pavone Emilio Frazzoli Francesco Bullo Laboratory for Information and Decision Systems Department of Aeronautics and Astronautics Massachusetts Institute of Technology Cambridge USA Center for Control Engineering and Computation University of California슠Santa Barbara USA

ISBN: (纸本)9781424414970;1424414970

We present decentralized algorithms for a class of stochastic and dynamic vehicle routing problems, known as the multiple-vehicle Dynamic Traveling Repairperson Problem (m-DTRP), in which demands arrive randomly over time and their locations have an arbitrary distribution, and the objective is to minimize the average waiting time between the appearance of a demand and the time it is visited by a vehicle. The best previously known control algorithms rely on centralized, a-priori task assignment, and are therefore of limited applicability in scenarios involving large ad-hoc networks of autonomous vehicles. By combining results from geometric probability and locational optimization, we provide a policy that solves, providing a constant-factor approximation to the optimal achievable performance, the decentralized version of the m-DTRP;such policy (i) does not rely on centralized and a priori task assignment, (ii) is spatially distributed, scalable to large networks, and adaptive to network changes. Simulation results are presented and discussed.

关键词： Vehicle routing Stochastic Decentralized Autonomous Vehicles Waiting time computer algorithms Policies algorithms Scalability

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Non-cooperative power control for energy-efficient and delay-aware wireless networks

Non-cooperative power control for energy-efficient and delay...

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WSA 2016;20th International ITG Workshop on Smart Antennas

作者： Alessio Zappone Luca Sanguinetti Merouane Debbah

This work aims at developing a distributed power control algorithm for energy efficiency maximization (measured in bit/Joule) in wireless networks. Unlike most previous works, a new formulation is proposed to jointly account for the energy efficiency and communication delay while ensuring quality-of-service constraints. A non-cooperative game-theoretic approach is taken, and feasibility conditions are derived for the best-response of the game. Under the assumption that these conditions are met, it is shown that the game admits a unique Nash equilibrium, which is guaranteed to be reached by implementing the game best-response dynamics. Based on these results, a convergent power control algorithm is derived, which can be implemented in a fully decentralized fashion.

关键词： Energy efficiency Power control Wireless networks Game theory Game animals Nash equilibrium Hunting computer algorithms

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Optimization of a Class of Nonlinear Switched Systems with Fixed-Levels Control Inputs

Optimization of a Class of Nonlinear Switched Systems with F...

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American Control Conference

作者： Vadim Azhmyakov Javier Cabrera Martinez Alexander Poznyak Ruthber Rodriguez Serrezuela Faculty of Electronics Biomedical Engineering and Mechatronics University of Antonio Narino Neiva 410001 Republic of Colombia Department of Automatic Control CINVESTAV A.P. 14-740 Av. I.P.N. no. 2508 C.P. 07360 Mexico D.F. Mexico

ISBN: (纸本)9781479917730

This paper is devoted to a consistent numerical method for Optimal Control Problems (OCPs) associated with a specific class of nonlinear systems. We study dynamic models equipped with the piecewise constant (fixed-level) control inputs. The presented formalism also includes some switched dynamic models. We develop an implementable control algorithm for the above-mentioned classes of switched-type OCPs, study convexity characteristics and discuss some key properties of the proposed numeric scheme. We also consider a computational example. The computational scheme we propose is based on the Armijo-type projected gradient methodology.

关键词： nonlinear switched systems dynamic models Numerical methods computer algorithms computational scheme

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UAV Circumnavigation of an Unknown Target Without Location Information Using Noisy Range-based Measurements

UAV Circumnavigation of an Unknown Target Without Location I...

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American Control Conference

作者： Araz Hashemi Yongcan Cao David Casbeer George Yin Department of Mathematics Wayne State University Detroit MI 48202 Control Science Center of Excellence Air Force Research Laboratory Wright-Patterson AFB OH 45433

ISBN: (纸本)9781479932757

This paper proposes a control algorithm for a UAV to circumnavigate an unknown target at a fixed radius when the location information of the UAV is unavailable. By assuming that the UAV has a constant velocity, the control algorithm makes adjustments to the heading angle of the UAV based on range and range rate measurements from the target, which may be corrupted by additive measurement noise. The control algorithm has the added benefit of being globally smooth and bounded. Exploiting the relationship between range rate and bearing angle, we transform the system dynamics from Cartesian coordinate in terms of location and heading to polar coordinate in terms of range and bearing angle. We then formulate the addition of measurement errors as a stochastic differential equation. A recurrence result is established showing that the UAV will reach a neighborhood of the desired orbit in finite time. Some statistical measures of performance are obtained to support the technical analysis.

关键词： POSITION INFORMATION computer algorithms Azimuthal angle System dynamics Voyages around the world Polar coordinates heading angle Cartesian coordinate system Noise measurement

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