检索结果-内蒙古大学图书馆

Cutting and packing problems for irregular objects with continuous rotations: mathematical modelling and non-linear optimization

引用

JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY 2016年第5期67卷 786-800页

作者： Stoyan, Yuriy Pankratov, Alexander Romanova, Tatiana Natl Acad Sci Ukraine Inst Mech Engn Problems UA-61046 Kharkov Ukraine

We further improve our methodology for solving irregular packing and cutting problems. We deal with an accurate representation of objects bounded by circular arcs and line segments and allow their continuous rotations and translations within rectangular and circular containers. We formulate a basic irregular placement problem which covers a wide spectrum of packing and cutting problems. We provide an exact non-linear programming (NLP) model of the problem, employing ready-to-use phi-functions. We develop an efficient solution algorithm to search for local optimal solutions for the problem in a reasonable time. The algorithm reduces our problem to a sequence of NLP subproblems and employs optimization procedures to generate starting feasible points and feasible subregions. Our algorithm allows us to considerably reduce the number of inequalities in NLP subproblems. To show the benefits of our methodology we give computational results for a number of new challenger and the best known benchmark instances.

关键词： cutting and packing irregular shapes circular arcs continuous rotations non-linear programming optimization

来源：评论

学校读者我要写书评

暂无评论

Solving infinite-horizon optimal control problems of the time-delayed systems by Haar wavelet collocation method

引用

COMPUTATIONAL & APPLIED MATHEMATICS 2016年第1期35卷 97-117页

作者： Mansoori, Masoomeh Nazemi, Alireza Shahrood Univ Sch Math Sci Dept Math POB ***-316 Shahrood Iran

A numerical method using Haar wavelets for solving infinite-horizon time-delayed optimal control problems is studied. The problem is first transformed, using a Pade approximation, to one without a time-delayed argument. By a suitable change of variable, the obtained non-delay infinite-horizon optimal control problem is converted to a finite-horizon non-linear optimal control problem. An approximation scheme based on Haar wavelets in the time domain is then proposed for solving the obtained optimal control problem. Haar wavelets integral operational matrix and direct collocation method are used to find the approximated optimal trajectory and the optimal control law of the original problem. Two illustrative examples are provided to show the feasibility and the efficiency of the proposed method.

关键词： Infinite-horizon Time-delayed Optimal control problems Approximation Rationalized Haar functions non-linear programming

来源：评论

学校读者我要写书评

暂无评论

Application of Interval Fuzzy Multi-objective Strategy Model in Water Resources Optimal Allocation

Application of Interval Fuzzy Multi-objective Strategy Model...

引用

2017 International Conference on Computing,Communications and Automation(I3CA 2017)

作者： Min Zhu Pingxiang University

Fuzzy multi-objective programming is an important optimization method to solve many complex practical problems. In this work, the applications of fuzzy multi-objective programming modeling for solving the practical problems in regional water resources optimal scheduling are studied. In order to strengthen the planning and management of water resources, the limited water resources are fully and effectively used scientifically. And because of the multi-objective and uncertainties of the regional water resources optimization scheduling problem, this paper adopts the fuzzy multi-objective programming method to deal with this complex practical problem. Based on the fuzzy multi-objective programming technique, the fuzzy multi-objective nonlinear programming model of regional water resources optimal dispatching is established. The multi-objective includes three goals: economic benefit, environmental benefit and social benefit. Then, the establishment and solving steps of the fuzzy multi-objective nonlinear programming model are introduced for the established model. Finally, the proposed scheme is evaluated and sorted. Finally, combined with the actual situation of a city to solve, verify the validity of the model.

关键词： Water Resources Optimal Allocation Multi-objective Strategy Model non-linear programming

来源：评论

学校读者我要写书评

暂无评论

Energy management system for enhanced resiliency of microgrids during islanded operation

引用

ELECTRIC POWER SYSTEMS RESEARCH 2016年 137卷 133-141页

作者： Balasubramaniam, Karthikeyan Saraf, Parimal Hadidi, Ramtin Makram, Elham B. Clemson Univ Holcombe Dept Elect & Comp Engn Clemson SC USA Clemson Univ Restorat Inst Charleston SC USA

This paper proposes a method to enhance resiliency of microgrids through survivability. Survivability in this context is to minimize load shed for the duration the microgrid is in islanded mode following a disturbance event. During islanded operation, microgrid loads are prioritized as critical and non-critical loads. The key decision is to ascertain whether to provide energy to non-critical loads after supplying the critical loads or to store excess energy for future dispatches. This task is formulated as a non-linear programming problem. The objective is to minimize the amount of critical load shed while maximizing the amount of non-critical load served for a projected restoration time while adhering to relevant operational and physical constraints. For this extended time-scale problem, uncertainty of renewable generation and load forecast is quantified with probability distribution and confidence levels are used to establish likelihood of forecast error. Distributed generation such as solar and wind farm along with battery energy storage system are modeled. Demand response is implemented through adjustable loads and a fleet of plug in hybrid electric vehicles that can be operated in both grid to vehicle and vehicle to grid mode. Test cases are studied on a modified CIGRE microgrid benchmark test system and results are compared with a temporal decomposition scheme based energy management system. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Demand response Energy management system Load shedding Microgrid non-linear programming Resilience

来源：评论

学校读者我要写书评

暂无评论

Optimal product pricing and lot sizing decisions for multiple products with nonlinear demands

引用

Journal of Management Analytics 2016年第1期3卷 43-58页

作者： Naeem Bajwa Belleh Fontem Charles R.Sox Department of Management College of BusinessUniversity of Arkansas at Little Rock2801 South University AvenueLittle RockArkansasUSA University of Mary Washington FredericksburgVirginiaUSA The University of Alabama TuscaloosaAlabamaUSA

Most manufacturing firms consider product pricing as a key strategic *** planning and scheduling,on the other hand,are mostly treated as a non-strategic *** businesses,therefore,follow some sequential decision-making process;where product prices are determined first and then operational plans are made to fulfill the resulting demand at the lowest possible *** this paper,we present a coordinated decision model approach for multiproduct pricing and lot sizing decisions for a manufacturer who has limited production *** the presented model is specific to demands that follow constant elasticity of the price,it can easily be extended to other convex demand *** show that a coordinated decision-making process where price and production plans are determined simultaneously may lead to substantially higher *** propose an efficient solution methodology for finding optimal prices and product quantities and use real-world data to demonstrate the applicability of this research.

关键词： pricing marketing and operations interface coordination non-linear programming

来源：评论

学校读者我要写书评

暂无评论

A non-linear program to find an approximate location of a second warehouse: A case study

引用

Kasetsart Journal of Social Sciences 2016年第3期37卷 190-201页

作者： Monthatipkul, Chumpol Graduate School of Management and Innovation King Mongkut's University of Technology Thonburi Bangkok 10140 Thailand

A mathematical model was developed to estimate the location of a second warehouse for a case study in Bangkok. A non-linear program was developed based on the Load Distance Technique. The objective function was to minimize the sum of weighted straight-line distances from the first or second warehouse to either vendors or customers. The straight-line distance was determined using the principle of Pythagorean triples and was weighted by the shipment frequency and the shipment cost rate. The model was then solved using the Microsoft Excel Solver upgraded to the Premium Solver Platform. The starting solutions were randomly set within a specified range to obtain different local optimal solutions. The best one was finally selected to be the approximate location of the second warehouse. Sensitivity to customer demands was conducted and some useful recommendations are provided. © 2016 Kasetsart University

关键词： Euclidean norm facility location non-linear programming

来源：评论

学校读者我要写书评

暂无评论

A Computing Based Design Model of Pneumatic Driven Variable Buoayncy System for Autonomous Underwater Vehicles

A Computing Based Design Model of Pneumatic Driven Variable ...

引用

MTS/IEEE Oceans Conference

作者： Sahoo, Patitapaban Sharma, R. Asokan, T. IIT Madras Dept Ocean Engn Design & Simulat Lab Madras 36 TN India IIT Madras Dept Ocean Engn Madras 36 TN India

ISBN: (纸本)9781509015375

In the era of modern computing based environment, the process of design is conceptualized, implemented and tested in a close loop integrating different modules of design, manufacturing and usages. In this regard, this paper presents a computing based design model for the design of a 'Pneumatic Driven Variable Buoyancy System (PDVBS)' for 'Autonomous Underwater Vehicles (AUVs)'. The presented design model is modular in architecture and integrates the design of PDVBS with design of AUV. The design approach is derived from the basic and advanced principles of mechanics and the approach is defined in the 'Computer Aided Design (CAD)' model in terms of different modules with implementation in Matlab*(TM). Finally, we present a design example of a PDVBS for depth rating up to 4200 m with application focused on a large AUV of length 7 m to show the efficiency and applicability of our proposed design model.

关键词： Variable buoyancy system Pneumatic driven system Underwater vehicle Computing model System dynamics non-linear programming

来源：评论

学校读者我要写书评

暂无评论

A Computer Simulation Model for Design of Variable Buoyancy System for Autonomous Underwater Vehicles/Gliders

A Computer Simulation Model for Design of Variable Buoyancy ...

引用

OCEANS Conference

作者： Tiwari, B. K. Sharma, R. Asokan, T. IIT Madras Dept Ocean Engn Design & Simulat Lab Madras 600036 Tamil Nadu India IIT Madras Dept Engn Design Madras 600036 Tamil Nadu India

ISBN: (纸本)9781467397247

The efficient control of buoyancy with low power is critically important in the design of new age 'Autonomous Underwater Vehicles/Gliders (AUVs/Gs)'. This paper presents a 'Computer Simulation Model (CSM)' for the primary design of 'Variable Buoyancy System (VBS)' for AUVs/AUGs to efficient control buoyancy and the simulation model is built in the environment of integration, modular architecture and specific range of applicability. The CSM for design of VBS is integrated in the overall design process of AUVs/AUGs. Finally, we present design example of the VBS for a AUVhaving two ballast tanks (each of a buoyancy capacity of +/- B = 10kg), maximum rate of change of buoyancy = 9 kg/minute;and our presented results show that the proposed CSM for the design of VBS for AUVs/AUGs simulates the design process efficiently and leads to an efficient and economic design with the desired and specific range of applications.

关键词： Variable buoyancy system Underwater vehicle Computing model System dynamics non-linear programming

来源：评论

学校读者我要写书评

暂无评论

A Game-theoretic Algorithm for non-linear Single-Path Routing Problems

引用

Electronic Notes in Discrete Mathematics 2016年 52卷 77-84页

作者： Vallet, Josselin Brun, Olivier Prabhu, Balakrishna CNRS LAAS 7 avenue du colonel Roche Toulouse F-31400 France Univ. de Toulouse LAAS Toulouse F-31400 France

This paper is devoted to non-linear single path routing problems, which are known to be NP-hard even in the simplest cases. We propose a Best Response algorithm, based on Game Theory, providing single-path routings with modest relative errors with respect to optimal solutions, while being several orders of magnitude faster than existing techniques. © 2016 Elsevier B.V.

关键词： Best response Game theory non-linear programming Single-path routing

来源：评论

学校读者我要写书评

暂无评论

SUPER-RESOLUTION RECONSTRUCTION OF HYPERSPECTRAL IMAGES VIA AN IMPROVED MAP-BASED APPROACH 36

SUPER-RESOLUTION RECONSTRUCTION OF HYPERSPECTRAL IMAGES VIA ...

引用

36th IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Irmak, Hasan Akar, Gozde B. Yuksel, Seniha Esen Aytaylan, Hakan Middle East Tech Univ Dept Elect & Elect Engn Ankara Turkey Hacettepe Univ Dept Elect & Elect Engn Ankara Turkey Aselsan Inc Ankara Turkey

ISBN: (纸本)9781509033324

Super-resolution Reconstruction (SRR) is technique to increase the spatial resolution of images. It is especially useful for hyperspectral images (HSI), which have good spectral resolution but low spatial resolution. In this study, we propose an improvement to our previous work and present a novel MAP-MRF (maximum a posteriori-Markov random Fields) based approach for the SRR of HSI. The key point of our approach is to find the abundance maps of an HSI and perform SRR on the abundance maps using MRF based energy minimization, without needing any other additional source of information. In order to do so, first, PCA is used to determine the endmembers. Second, SISAL and fully constraint least squares (FCLS) are used to estimate the abundance maps. Third, in order to find the high resolution abundance maps, the ill-posed inverse SRR problem for abundances is regularized with a MAP-MRF based approach. The MAP-MRF formulation is restricted with the constraints which are specific to the abundances. Using the non-linear programming (NLP) techniques, the convex MAP formulation is minimized and High Resolution (HR) abundance maps are obtained. Then, these maps are used to construct the HR HSI. This improved SRR method is verified on real data sets, and quantitative performance comparison is achieved using PSNR, SSIM and PSNR metrics. Our results indicate that this improved method gives very close results to the original high resolution images, keeps the spectral consistency, and performs better than the compared algorithms.

关键词： Hyperspectral Super-resolution Reconstruction MAP-MRF non-linear programming

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：