检索结果-内蒙古大学图书馆

Joint link-based credit charging and road capacity improvement in continuous network design problem

TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE 2014年 67卷 1-14页

作者： Wang, Guangmin Gao, Ziyou Xu, Meng Sun, Huijun China Univ Geosci Sch Econ & Management Wuhan 430074 Peoples R China Beijing Jiaotong Univ Sch Traff & Transportat Beijing 100044 Peoples R China

In this paper, we will discuss the urban road network improvement problem from both supply and demand sides, and propose a bilevel programming model considering joint optimal link-based tradable credit charging scheme and road capacity improvement. The upper level decision-maker tries to minimize the total system travel time under a budget constraint by optimizing both link-based credit charging and road capacity improvement, whilst at the lower level considering the users' route choice behavior through the generalized travel time including the travel time and the converted time from the value of credit charging for using the link. Therefore, this proposed model integrates the improvement of the urban road network according to improving the road capacity with the given budget constraint and decreasing the travel demand with the tradable credit scheme. After presenting a relaxation algorithm, the numerical experiments on the nine node network are illustrated. Analysis shows that the proposed model is efficient in mitigating traffic congestion according to the less total system travel time than the other ways compared in this paper. The tradable credit scheme offers the better combination of cost-effectiveness, administrative flexibility and distributional fairness comparing with congestion pricing. Moreover, this tradable credit scheme is revenue neutral. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Continuous network design problem (CNDP) Bilevel programming problem relaxation algorithm Tradable credit scheme

来源：评论

学校读者我要写书评

暂无评论

System Identification of Underwater Vehicles with ML algorithm

System Identification of Underwater Vehicles with ML Algorit...

引用

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

来源：评论

学校读者我要写书评

暂无评论

A Link-Node Discrete-Time Dynamic Second Best Toll Pricing Model with a relaxation Solution algorithm

引用

NETWORKS & SPATIAL ECONOMICS 2009年第2期9卷 243-267页

作者： Ban, Xuegang (Jeff) Liu, Henry X. Rensselaer Polytech Inst Dept Civil & Environm Engn Troy NY 12180 USA Univ Minnesota Dept Civil Engn Minneapolis MN USA

Dynamic congestion pricing has become an important research topic because of its practical implications. In this paper, we formulate dynamic second-best toll pricing (DSBTP) on general networks as a bilevel problem: the upper level is to minimize the total weighted system travel time and the lower level is to capture motorists' route choice behavior. Different from most of existing DSBTP models, our formulation is in discrete-time, which has very distinct properties comparing with its continuous-time counterpart. Solution existence condition of the proposed model is established independent of the actual formulation of the underlying dynamic user equilibrium (DUE). To solve the bilevel DSBTP model, we adopt a relaxation scheme. For this purpose, we convert the bilevel formulation into a single level nonlinear programming problem by applying a link-node based nonlinear complementarity formulation for DUE. The single level problem is solved iteratively by first relaxing the strick complementarity by a relaxation parameter, which is then progressively reduced. Numerical results are also provided in this paper to illustrate the proposed model and algorithm. In particular, we show that by varying travel time weights on different links, DSBTP can help traffic management agencies better achieve certain system objectives. Examples are given on how changes of the weights impact the optimal tolls and associated objective function values.

关键词： Congestion pricing Dynamic second best toll pricing Dynamic user equilibrium relaxation algorithm

来源：评论

学校读者我要写书评

暂无评论

Proposing a Electricity Market Framework for the Energy Internet

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

System Identification of Underwater Vehicles with ML algorithm

System Identification of Underwater Vehicles with ML Algorit...

引用

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

作者： Jianguo Wang Gangyi Hu Chun meng Jiang China Ship Development and Design Center City College of Wuhan University of Science and Technology Humanities Department

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 *** 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

来源：评论

学校读者我要写书评

暂无评论

Learning model in relaxation algorithm influenced by self-organizing maps for image restoration

引用

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 2008年第4期3卷 404-412页

作者： Maeda, Michiharu Shigei, Noritaka Miyajima, Hiromi Fukuoka Inst Technol Fac Informat Engn Dept Comp Sci & Engn Higashi Ku Fukuoka 8110295 Japan Kagoshima Univ Fac Engn Dept Elect & Elect Engn Kagoshima 8900065 Japan

This paper presents a learning model in relaxation algorithm influenced by self-organizing maps for reducing random-valued impulse noise. Self-organizing maps have been hitherto studied for the ordering process and the convergence phase of weight vectors. As a novel approach of self-organizing maps, a learning model in relaxation algorithm for image restoration is proposed, which creates a map containing one unit for each pixel. Utilizing pixel values as input, image inference is conducted by self-organizing maps. Then, an updating function with threshold according to the difference between input value and inferred value is introduced, so as not to respond to noisy input sensitively. Therefore the inference of an original image proceeds appropriately since any pixel is influenced by neighboring pixels corresponding to the neighboring setting. The characteristic of our approach includes the network constructing the same number of both inputs and weights for inferring the original image from a degraded image in sequential processing, unlike the distinct number in which self-organizing maps have applied to conventional techniques for the ordering and the convergence of weight vectors. In the inference process, the effect of initial threshold and initial neighborhood on accuracy is examined. Experimental results are presented in order to show that our approach is effective in quality for image restoration. (C) 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

关键词： image restoration self-organizing maps learning relaxation algorithm peak signal to noise ratio

来源：评论

学校读者我要写书评

暂无评论

Efficient numerical method for linear stability analysis of solitary waves

引用

COMPUTER PHYSICS COMMUNICATIONS 2011年第12期182卷 2479-2485页

作者： Alexandrescu, Adrian Salgueiro, Jose R. Univ Vigo Dept Fis Aplicada Area Opt Orense 32004 Spain

In this paper we use a numerical relaxation algorithm to improve and generalize the obtainment of the perturbation eigenstates of nonlinear systems. As a model problem we consider the linear stability analysis of the vortex eigenstates of the cubic-quintic nonlinear Schrodinger equation. It is shown by numerical calculations that the relaxation algorithm permits accurate tracing of complex perturbation eigenvalues. (C) 2011 Elsevier B.V. All rights reserved.

关键词： Nonlinear waves Linear stability Complex eigenvalues relaxation algorithm

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

A Pure Vision-based Approach to Topological SLAM

A Pure Vision-based Approach to Topological SLAM

引用

IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Lui, Wen Lik Dennis Jarvis, Ray Monash Univ Dept Elect & Comp Syst Engn Intelligent Robot Res Ctr Clayton Vic 3800 Australia

ISBN: (纸本)9781424466757

This paper describes a topological SLAM system using a purely vision-based approach. This robot utilizes a GPU-based omnidirectional catadioptric stereovision system to perceive and plan its path in the environment. Subsequently, the omnidirectional images generated are used to incrementally build a database of image signatures based on the standard 2D Haar Wavelet decomposition. In order to maintain a globally consistent topological map, a relaxation algorithm, which requires local metric information between nodes, is employed each time the appearance-based localization system revisits an existing node in the topological map. The relative transformation of the current position of the robot with respect to the actual position of the matched node is recovered by using a least squares estimation of the transformation parameters of two 3D point patterns generated by the stereovision system. In addition, local metric information is obtained by using the proposed visual odometry system which combines distance measurements calculated by using optical flow techniques which estimates the movement of a web camera relative to the ground being observed and bearing estimates from the omnidirectional catadioptric vision system. Experiments were conducted in a variety of environments ranging from indoor to outdoor environments which demonstrate the feasibility of this approach.

关键词： GPU-based omnidirectional catadioptric stereovision system Haar transforms SLAM (robots) distance measurement distance measurements globally consistent topological map image sensors image sequences image signatures least squares approximations least squares estimation omnidirectional images optical flow techniques pure vision-based approach relaxation algorithm relaxation theory robot vision standard 2D Haar wavelet decomposition stereo image processing topological SLAM transformation parameters visual odometry wavelet transforms web camera

来源：评论

学校读者我要写书评

暂无评论

Game-theoretic Approach of Fair Bandwidth Allocation in DVB-RCS Networks

Game-theoretic Approach of Fair Bandwidth Allocation in DVB-...

引用

International Workshop on Satellite and Space Communications

作者： Vassaki, Stavroula Panagopoulos, Athanasios D. Constantinou, Philip Natl Tech Univ Athens ICCS Mobile Radio Commun Lab Sch Elect & Comp Engn GR-15780 Athens Greece

ISBN: (纸本)9781424443840

In the present paper we study the problem of bandwidth allocation in DVB-RCS networks. DVB-RCS networks operate at Ku band and above. At these frequencies, rain attenuation is the dominant fading mechanism and exhibits significant spatial-temporal variation among the users. Firstly, the resource allocation is modeled as a non cooperative game and we find the Nash equilibrium employing the Nikaido-Isoda function and a relaxation algorithm. Moreover, we force the game to converge to a more fair equilibrium point, by introducing a pricing scheme. The bandwidth allocation to users that are affected more by rain fading is improved. Finally, we apply the principles of a cooperative game to describe the problem of resource allocation and we compare the results of the three approaches. Some useful conclusions are drawn.

关键词： DVB-RCS bandwidth allocation game theory Nikaido-Isoda function relaxation algorithm nash bargaining

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：