检索结果-内蒙古大学图书馆

Implementation of a combinatorial-optimisation-based threat evaluation and jamming allocation system

IET RADAR SONAR AND NAVIGATION 2019年第10期13卷 1636-1645页

作者： You, Shixun Diao, Ming Gao, Lipeng Harbin Engn Univ Dept Informat & Commun Engn Harbin 150001 Heilongjiang Peoples R China

Electromagnetic warfare is the most extensive and most hidden theatre of battle in modern warfare. To enhance the jamming effectiveness of a cooperative jammer platform against the threat of a radar net, a combinatorial-optimisation-based threat evaluation and jamming allocation (COTEJA) system is proposed. This COTEJA system fully considers the confrontation analysis in the jammer-radar process, including the interactions between radars, jammers, and jammer-radar pairs, and emphasises the realisation of cooperative jamming strategies. The cooperative jamming strategies include the combination of jamming techniques and optimisation algorithms for the objective function. The performance of the COTEJA system is evaluated through a combat mission that considers a platform with four jammers attacking five threats. In addition, the extended permutation-based differential evolution algorithm is used for the first time to optimise the jamming coding matrix, which effectively reduces the danger value of netted radar under multiple constraints. The numerical results reveal that the COTEJA system can make the optimal jamming decision within 1 s, which improves the survival ability of the platform in a complicated electromagnetic environment.

关键词： jamming optimisation evolutionary computation COTEJA system jammers extended permutation-based differential evolution algorithm jamming coding matrix netted radar optimal jamming decision combinatorial-optimisation-based threat evaluation jamming allocation system electromagnetic warfare modern warfare jamming effectiveness jammer platform radar net jammer-radar process radars jammer-radar pairs jamming strategies optimisation algorithms time 1 0 s

来源：评论

学校读者我要写书评

暂无评论

CONTROL ASPECTS OF INTRAAORTIC BALLOON PUMPING - AN OVERVIEW

引用

PROCEEDINGS OF THE IEEE 1988年第9期76卷 1210-1217页

作者： WELKOWITZ, W LI, JKJ Dept. of Biomed. Eng. Rutgers Univ. Piscataway NJ

Temporary or permanent, internal or external, in-series or bypass cardiac assist devices are examined with emphasis on intraaortic balloon pumping. Physiological and clinical consequences of the medical assistance are discussed. Major advantages of the devices are to provide adequate perfusion and, secondarily, to unload the heart and to reduce oxygen consumption of the failing myocardium. Major problems with the cardiac assist devices are related to synchronization with the natural heart, or proper timing, and to the determination of suitable control variables. Optimization algorithms based on the selected performance criteria and computer-based automatic controls are instituted to overcome some of these shortcomings. Finally schemes of automatic control of implantable assist devices are discussed

关键词： automatic control biocontrol cardiac assist devices cardiology control variables failing myocardium O2 consumption heart unloading implantable assist devices intraaortic balloon pumping optimisation algorithms prosthetics reviews

来源：评论

学校读者我要写书评

暂无评论

Finite-time H2/H∞ control for linear Ito stochastic Markovian jump systems: mode-dependent approach

引用

IET CONTROL THEORY AND APPLICATIONS 2020年第20期14卷 3557-3567页

作者： Yan, Zhiguo Song, Yunxia Park, Ju H. Qilu Univ Technol Shandong Acad Sci Sch Elect Engn & Automat Jinan 250353 Peoples R China Yeungnam Univ Dept Elect Engn 280 Daehak Ro Gyongsan 38541 South Korea

This study focuses on the finite-time (FT) H-2/H-infinity control problem for linear Ito-type stochastic Markovian jump systems (SMJS). According to the characteristics of SMJS, a mode-dependent approach (MDA) is provided. Through MDA, state feedback and observer-based FT H-2/H-infinity controllers are designed. Compared with the mode-independent approach, the advantages of MDA are clearly shown. In the sequel, two new optimisation algorithms for deriving the optimal FT H-2/H-infinity controller are proposed. Finally, a numerical example is utilised to show the merits of the obtained results.

关键词： state feedback stochastic systems linear matrix inequalities linear systems H-infinity control optimisation Ito stochastic Markovian jump systems mode-dependent approach MDA state feedback optimisation algorithms H infinity control problem

来源：评论

学校读者我要写书评

暂无评论

A Physarum-inspired Model for the Probit-based Stochastic User Equilibrium Problem

引用

INTERNATIONAL JOURNAL OF UNCONVENTIONAL COMPUTING 2017年第2期13卷 139-159页

作者： Xu, Shuai Jiang, Wen Li, Xin Northwestern Polytech Univ Sch Elect & Informat Xian 710072 Shaanxi Peoples R China

Stochastic user equilibrium is an important issue in the traffic assignment problems, traditional models for the stochastic user equilibrium problem are designed as mathematical programming problems. A Physarum-inspired model for the probit-based stochastic user equilibrium problem is proposed. There are two main contributions of our work. On the one hand, the original Physarum model is modified to find the shortest path in directed traffic networks with the properties of two-way traffic characteristic. On the other hand, the modified Physarum-inspired model could get the equilibrium flows when traveller's perceived transportation cost complies with normal distribution. The proposed method is a two-step procedure. First, the modified Physarum model is applied to estimate the auxiliary flows. Second, the auxiliary flows are averaged to obtain the equilibrium flows. Numerical examples are analysed to evaluate the performance of the proposed method, which is compared with the Method of Successive Average method.

关键词： Networks optimisation algorithms physarum stochastic traffic equilibrium

来源：评论

学校读者我要写书评

暂无评论

algorithms for logit-based stochastic user equilibrium assignment

引用

TRANSPORTATION RESEARCH PART B-METHODOLOGICAL 1998年第8期32卷 539-549页

作者： Maher, M Napier Univ Dept Civil & Transportat Engn Edinburgh EH10 5DT Midlothian Scotland

The paper proposes an efficient algorithm for determining the stochastic user equilibrium solution for logit-based loading. The commonly used Method of Successive Averages typically has a very slow convergence rate. The new algorithm described here uses Williams' result [ Williams, H. C. W. L. (1977) On the formation of travel demand models and economic evaluation measures of user benefit. Environment and Planning 9A(3), 285-344] which enables the expected value of the perceived travel costs S-rs to be readily calculated for any flow vector x. This enables the value of the Sheffi and Powell objective function [Sheffi, Y. and Powell, W. B. (1982) An algorithm for the equilibrium assignment problem with random link times. Networks 12(2), 191-207], and its gradient in any specified search direction, to be calculated. It is then shown how, at each iteration, an optimal step length along the search direction can be easily estimated, rather than using the pre-set step lengths, thus giving much faster convergence. The basic algorithm uses the standard search direction (towards the auxiliary solution). In addition the performance of two further versions of the algorithm are investigated, both of which use an optimal step length but alternative search directions,based on the Davidon-Fletcher-Powell function minimisation method. The first is an unconstrained and the second a constrained version. Comparisons are made of all three versions of the algorithm, using a number of test networks ranging from a simple three-link network to one with almost 3000 links. It is found that for all but the smallest network the version using the standard search direction gives the fastest rate of convergence. Extensions to allow for multiple user classes and elastic demand are also possible. (C) 1998 Elsevier Science Ltd. All rights reserved.

关键词： networks stochastic traffic assignment equilibrium optimisation algorithms

来源：评论

学校读者我要写书评

暂无评论

Methodology of solution for the distribution network reconfiguration problem based on improved harmony search algorithm

引用

IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第26期14卷 6526-6533页

作者： dos Santos, Murillo Vieira Brigatto, Gelson A. Garces, Lina P. Univ Fed Goias Elect Mech & Comp Engn Sch Ave Univ 1488 Goiania Go Brazil

The topology of power distribution systems can be modified by altering the status of sectional and tie switches for load management and protection, while maintaining the required network radiality. Several effective optimisation algorithms and graph theory-based techniques for system radiality detection have been proposed in specialised literature to solve the distribution network reconfiguration problem, usually seeking to achieve power loss reductions and voltage profile improvements. This work aims to contribute to this line of research and its novelties are composed of proposing as solution method a methodology based in an enhanced version of harmony search metaheuristic called improved harmony search algorithm, and a new simple and effective system impedance matrix based process to detect islanding of nodes as a strategy to meet radiality constraint. The proposed methodologies were applied to 33-bus, 84-bus and 118-bus distribution networks known from technical literature, aiming to total active power loss minimisation. As comparison between methods, a key focus in analysis of results is related to discuss some advantages and effectiveness of improved harmony search over original harmony search algorithm to attain optimal radial topologies.

关键词： search problems distributed power generation optimisation graph theory power distribution faults load management optimal radial topologies improved harmony search algorithm power distribution systems load management optimisation algorithms system radiality detection voltage profile improvements 84-bus distribution network active power loss minimisation 118-bus distribution network tie switches sectional switches graph theory-based techniques achieve power loss reductions harmony search metaheuristic model islanding model 33-bus distribution network

来源：评论

学校读者我要写书评

暂无评论

A review of hierarchical control for building microgrids

引用

RENEWABLE & SUSTAINABLE ENERGY REVIEWS 2020年 118卷 109523-109523页

作者： Yamashita, Daniela Yassuda Vechiu, Ionel Gaubert, Jean-Paul ESTIA Inst Technol Bidart France Univ Poitiers LIAS Poitiers France

Building microgrids have emerged as an advantageous alternative for tackling environmental issues while enhancing the electricity distribution system. However, uncertainties in power generation, electricity prices and power consumption, along with stringent requirements concerning power quality restrain the wider development of building microgrids. This is due to the complexity of designing a reliable and robust energy management system. Within this context, hierarchical control has proved suitable for handling different requirements simultaneously so that it can satisfactorily adapt to building environments. In this paper, a comprehensive literature review of the main hierarchical control algorithms for building microgrids is discussed and compared, emphasising their most important strengths and weaknesses. Accordingly, a detailed explanation of the primary, secondary and tertiary levels is presented, highlighting the role of each control layer in adapting building microgrids to current and future electrical grid structures. Finally, some insights for forthcoming building prosumers are outlined, identifying certain barriers when dealing with building microgrid communities.

关键词： Electricity market Energy management system optimisation algorithms Renewable energy source Prosumer

来源：评论

学校读者我要写书评

暂无评论

Optimal re-dispatch of an isolated system considering transient stability constraints

引用

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2013年第1期44卷 728-735页

作者： Calle, Ignacio A. Castronuovo, Edgardo D. Ledesma, Pablo Univ Carlos III Madrid Dept Elect Engn Leganes 28911 Madrid Spain

In this paper, an algorithm for calculating the optimal operation of a system with different load states and fault clearing times is proposed. The algorithm simultaneously considers both economic and stability constraints. The proposed formulation is evaluated on the Majorca and Minorca islands power system, which is a small, isolated system with low inertia. A conventional optimisation tool is used to solve the optimisation problem. The results show the efficiency of the proposed approach and the advantages of including stability restrictions in the optimisation analysis. The application of the algorithm to different operation points is used to evaluate the cost of assuring the transient stability after a severe fault in the transmission grid. The analysis of different fault clearing times is used to estimate the economic savings of implementing a faster protection system. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Nonlinear programming optimisation algorithms Power system transient stability Optimal power flow with dynamical constraints Stability of power systems

来源：评论

学校读者我要写书评

暂无评论

FROM OBJECTS TO CLASSES - algorithms FOR OPTIMAL OBJECT-ORIENTED DESIGN

引用

SOFTWARE ENGINEERING JOURNAL 1991年第4期6卷 205-228页

作者： LIEBERHERR, KJ BERGSTEIN, P SILVALEPE, I College of Computer Science Northeastern University Boston USA

The contributions of this paper are two-fold: first, we introduce a novel, axiomatically defined, object-oriented data model called the Demeter kernel model;and secondly, we present abstraction and optimisation algorithms and their relationships for designing classes from objects in the kernel model. We analyse several computational problems underlying the class design process, which is divided into two phases;a learning phase and an optimisation phase. This study focuses on approximation algorithms for the optimisation phase and aims to lead to a better understanding and a partial automation of the object-oriented design process. The algorithms and the theory presented here have been implemented in the C + + Demeter System, a CASE tool for object-oriented design and programming.

关键词： software tools Minimum Class Dictionary Learning directed graphs directed graph approximation algorithms Systems analysis and programming Combinatorial mathematics optimisation algorithms optimisation abstraction data structures C++Demeter System Demeter kernel model object-oriented programming class dictionary graph object-oriented design object-oriented data model Programming support CASE tool optimisation techniques

来源：评论

学校读者我要写书评

暂无评论

ITSE optimal controller design and achievable performance bounds

引用

INTERNATIONAL JOURNAL OF CONTROL 2009年第11期82卷 2115-2126页

作者： Carrasco, D. S. Salgado, M. E. Univ Tecn Federico Santa Maria Dept Elect Engn Valparaiso Chile

This article proposes a methodology to design optimal controllers and to compute achievable performance bounds in the control of linear, stable discrete-time SISO plants. The performance is measured using a time-weighted cost function (ITSE) of the tracking error for a step reference or a step output disturbance, combined with a measure of the energy of the incremental control. The proposed methodology relies on the use of a function space product that, for stable systems, can be defined in both the frequency and the time-domains. The solution technique requires the expansion of stable functions in orthogonal basis. An analytical expression is found for the computation of the optimal coefficients of the expansion. Numerical examples are included to illustrate the results.

关键词： optimal control performance bounds linear systems optimisation algorithms

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

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

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：