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IEEE Electric Ship Technologies Symposium (ESTS 2007)

作者： Huang, Qinghua Wu, Jian Bastos, Jimena L. Schulz, Noel N. Mississippi State Univ Dept Elect & Comp Engn Box 9571 Mississippi State MS 39762 USA

ISBN: (纸本)9781424409464

The development of shipboard power systems for the new generation of all-electric ships is challenging in two aspects. First, all new equipment needs to be tested before being installed onboard;otherwise, the design and testing process would become increasingly costly and risky. Second, the complexity of a shipboard power system demands the use of significant computational resources for detailed computer-aided analysis. Distributed simulation techniques can help reduce the computational load that simulation of shipboard power systems requires by partitioning the system into smaller, more manageable subsystems. Distributed simulation can also facilitate remote testing of equipment and collaboration among research teams located in geographically distant institutions. The initial step in distributed simulation requires achieving software-to-software communication over a network. This paper outlines the progress done at the Mississippi State University in the distributed simulation application to shipboard power systems. Both natural and signal coupling models for distributed simulation are developed and validated. For natural coupling, a general coupling method, which considers transmission lines as suitable decoupling points, is proposed. Distributed simulation tests on several systems, including a shipboard power system, are documented and simulation results demonstrate the feasibility of applying distributed simulation techniques in advanced shipboard modeling and simulation.

关键词： Decoupling method Distributed simulation Interface model relaxation algorithm Shipboard power system

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A method for generating reliable atomistic models of amorphous polymers based on a random search of energy minima

A method for generating reliable atomistic models of amorpho...

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Europhysics Conference on Computational Physics

作者： Curcó, D Casanovas, J Roca, M Alemán, C Univ Politecn Catalunya ETS Engn Ind Barcelona Dept Engn Quim E-08028 Barcelona Spain Univ Barcelona Fac Quim Dept Engn Quim E-08028 Barcelona Spain Univ Lleida Escola Politecn Super Dept Quim E-25001 Lleida Spain

A method for generating atomistic models of dense amorphous polymers is presented. The method is organized in a two-steps procedure. First, structures are generated using an algorithm that minimizes the torsional strain. After this, a relaxation algorithm is applied to minimize the non-bonding interactions. Two alternative relaxation methods, which are based simple minimization and Concerted Rotation techniques, have been implemented. The performance of the method has been checked by simulating polyethylene, polypropylene, nylon 6, poly(L,D-lactic acid) and polyglycolic acid. (c) 2005 Elsevier B.V. All rights reserved.

关键词： amorphous polymers atomistic simulation Monte Carlo generation algorithm relaxation algorithm ConRot SuSi

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Analysis of Nash equilibrium considering multi-commodity trade in coupled constraint electricity markets

Analysis of Nash equilibrium considering multi-commodity tra...

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International Conference on Power Systems Technology (POWERCON)

作者： Huang, Dawei Han, Xueshan Meng, Xiangxing Guo, Zhizhong Harbin Inst Technol Dept Elect Engn Harbin 150001 Peoples R China Shandong Univ Sch Elect Engn Jinan 250061 Peoples R China Harbin Inst Technol Dept Elect Engn Harbin 150001 Peoples R China

ISBN: (纸本)9781424401109

This paper adopts a Nash-Cournot game theoretic framework and uses a linear DC network to represent transmission constraints. The multi-dimensional Cournot game is presented and, the bilateral model of spatial market is bunt. Because of capacity constraints and Kirchhoff's laws, in this equilibrium model, the participants' strategy space is coupled. The market equilibrium is defined as a set of prices, generator outputs, transmission flows, and consumption that simultaneously satisfy each market participant's first order conditions for maximization of its profit while clearing the market. The multi-commodity trade in electricity markets is simulated by multi-dimensional Cournot model. A numerical method based on the Nikaido-Isoda function and a relaxation algorithm (NIRA) is presented for a calculation of coupled constraint Nash equilibrium in coupled constraint electricity markets. The interactions between energy and ancillary services markets and the transmission capacity limits effect are discussed. A three-bus bilateral market example with a DC model of the transmission fine constraints is used to test the feasibility of the proposed algorithm. Simulation results show that the proposed model can be used to analyze market power in electricity market and to guide the companies in making decisions.

关键词： electricity market game theory market power Nash-Cournot equilibrium Nikaido-Isoda function relaxation algorithm

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A computational environment to simulate complex tendinous topologies

A computational environment to simulate complex tendinous to...

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26th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society

作者： Valero-Cuevas, FJ Lipson, H Cornell Univ Sibley Sch Mech & Aerosp Engn Ithaca NY 14853 USA

ISBN: (纸本)0780384393

Static and dynamic manipulation of objects with the fingertips (precision pinch) is essential to the activities of daily living. Despite numerous efforts to study the hand and its pinch function [5, 18], a comprehensive understanding of biomechanical function and neuromuscular control of the fingers eludes researchers. To make progress in understanding precision pinch we are creating biomechanical models to simulate finger function, neuromuscular control and rehabilitation. An important challenge in creating biomechanical models of the fingers is to simulate the tension distribution in the extensor mechanism-a defining biomechanical feature of the fingers consisting of a tendinous network that wraps over the dorsum of the phalanges. We have created a biomechanical modeling environment that can, among other things, predict tension distribution in the extensor mechanism. Our predictions show that the distribution of tension can be very sensitive to the assumed network topology-the number of elements and their connectivity.

关键词： hand thumb motor control relaxation algorithm

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Transputer implementations of chemical substructure searching algorithms

Tetrahedron Computer Methodology

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Tetrahedron Computer Methodology 1988年第3期1卷 207-217页

作者： Downs, Geoffrey M. Lynch, Michael F. Willett, Peter Manson, Gordon A. Wilson, George A. Department of Information Studies Sheffield University Sheffield S10 2TN United Kingdom Department of Computer Science Sheffield University Sheffield S10 2TN United Kingdom

Two chemical substructure searching algorithms, the relaxation algorithm and the set reduction algorithm, are introduced and described. Transputer based serial implementations of both are compared for performance;the relaxation algorithm is shown to be both more effective and more efficient. Strategies are discussed for multi-transputer implementations of the relaxation algorithm. Experimental results show that near-linear speedups are obtained with networks containing up to 21 transputers. © 1989.

关键词： Parallel processing relaxation algorithm Set reduction algorithm Substructure search

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RSS Ranging Based Wi-Fi Localization for Unknown Path Loss Exponent

RSS Ranging Based Wi-Fi Localization for Unknown Path Loss E...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Zhang, Qing Foh, Chuan Heng Seet, Boon-Chong Fong, A. C. M. Nanyang Technol Univ Sch Comp Engn Singapore 639798 Singapore Auckland Univ Dept Elect & Elect Engn Auckland New Zealand Auckland Univ Sch Comp & Math Sci Auckland New Zealand

ISBN: (纸本)9781424492688

Localization of mobile phones is important to location-based mobile services, but achieving good location estimation of mobile phones is difficult especially in environment whose path loss exponent is unknown. In this paper, we present a Wi-Fi localization solution specifically designed for dense WLANs with unknown path loss exponent. In order to leverage between the computational cost and localization accuracy, our solution establishes a neighbor selection scheme based on the Voronoi diagram to identify a subset of Access Points (APs) to participate in localization. It considers the identified subset of APs and a mobile phone to be located as a mass-spring system. Provided with information of known coordinates of APs, the solution estimates the path loss exponent of the physical environment, infers inter-distances between APs and the mobile phone from Wi-Fi signals received, and implements spring-relaxation algorithm to approximate the geographical location of the mobile phone, where this location estimation is fed back to refine the estimated exponent iteratively. Extensive simulation results confirm that our solution is able to provide location estimation with an attractive average accuracy of below 2 m in a typical Wi-Fi setup.

关键词： Accuracy Estimation IEEE 802.11 Standards Mobile handsets RSS ranging Strontium Voronoi diagram WLAN Wi-Fi localization Wireless LAN Wireless sensor networks access points computational geometry geographical location location estimation location-based mobile services mass-spring system mobile handsets mobile phones neighbor selection scheme relaxation algorithm unknown path loss exponent wireless LAN

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Study on three dimension assignment algorithm of radar and ESM data association

Study on three dimension assignment algorithm of radar and E...

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7th International Conference on Signal Processing

作者： Zhou, L He, Y Dong, YL Naval Aeronaut Engn Inst Res Inst Informat Fus Yantai 264001 Peoples R China

ISBN: (纸本)7121002159

Among various data association algorithms, lagrangian relaxation algorithm of assignment problem has its advantage owing to the satisfying association accuracy in application., but the calculating speed of this algorithm is not satisfied. This paper presents some studies for the influence elements to the effect of data association of multisensor-multitarget in lagrangian relaxation algorithm. It is tested that the effect of data association can be improved through rational modification of elements involved. Simulation results are given to illustrate the effectiveness of the proposed modification algorithm in this paper.

关键词： assignment problem data association relaxation algorithm

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System Identification of Underwater Vehicles with ML algorithm

System Identification of Underwater Vehicles with ML Algorit...

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3rd International Conference on Mechanical Materials and Manufacturing Engineering (ICMMME 2013)

作者： Wang, Jianguo Hu, Gangyi Jiang, Chun Meng China Ship Dev & Design Ctr Wuhan Peoples R China City Coll Wuhan Univ Sci & Technol Dept Humanities Wuhan Peoples R China

ISBN: (纸本)9783037859223

Maximum-likelihood (ML) and its relaxation algorithm are discussed which are used to identify the mathematics model of an Underwater Vehicle (UV). With trial data of zigzag tests, the hydrodynamic derivatives of the UV were estimated, and the better astringency of the relaxation algorithm can be acquired from the contrast between the two methods. A simulation environment based on these parameters is established to verify the validity and effect of these methods. The result shows the model is credible and the methods are very useful for the research of maneuverability and intelligent control of underwater vehicles.

关键词： underwater vehicle system identification Maximum-likelihood algorithm relaxation algorithm

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A method for generating reliable atomistic models of amorphous polymers based on a random search of energy minima

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COMPUTER PHYSICS COMMUNICATIONS 2005年第1-3期169卷 335-338页

关键词： amorphous polymers atomistic simulation Monte Carlo generation algorithm relaxation algorithm ConRot SuSi

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Proposing a Electricity Market Framework for the Energy Internet

Proposing a Electricity Market Framework for the Energy Inte...

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General Meeting of the IEEE-Power-and-Energy-Society (PES)

作者： Su, Wencong Huang, Alex Q. N Carolina State Univ FREEDM Syst Ctr Raleigh NC 27606 USA

ISBN: (纸本)9781479913039

Smart Grid is drawing increasing attentions and reshaping the traditional view of power systems in the last decade. The Future Renewable Electric Energy Delivery and Management (FREEDM) Systems provide a promising solution to accommodate the high penetration of intermittent renewable energy resources and the emerging Smart Grid technologies. As a future automated and flexible electric power distribution system, the envisioned FREEDM systems enable the customers to fully participate in a deregulated electricity market. The customers are not only the price-takers but also the electricity suppliers by locally operating and managing their own Distributed Generators (DGs), Distributed Energy Storage Devices (DESDs), and dispatchable loads. This paper proposes a novel framework for a deregulated electricity market to enable the "Energy Internet" in a residential distribution system. It can achieve the flexible energy/power dispatch by allowing the customers to maximize their own benefits and compete with each other. Some game-theoretic methodologies (e.g., Nikaido-Isoda function and relaxation algorithm) are applied to determine the equilibrium solutions in a deregulated electricity market. A numerical case study is performed to validate the proposed approach. Accordingly, the numerical simulation results demonstrate the effectiveness and accuracy of the proposed framework for clearing the deregulated electricity market price enabling the "Energy Internet".

关键词： Smart Grid FREEDM Systems Energy Internet Electricity Market Game Theory Nash Equilibrium relaxation algorithm

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