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2013 5th International Conference on Modeling, Simulation and Applied Optimization (ICMSAO)最新文献

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Existence and uniqueness of the inversion of a generalized Radon transform 广义Radon变换反演的存在唯一性
R. Gouia-Zarrad
In this paper, we study a new class of Radon transform defined on circular cones called the conical Radon transform (CRT). There has been a substantial spike of interest towards this integral transform in the last decade mainly due to its connection to the mathematical models of several applications used in different domains such as nuclear industry, homeland security, astrophysics etc. This paper contains new results about the existence and uniqueness of the representation of a function by its CRT with fixed opening angle and fixed axis direction in R3. The results are relevant not only as a new generalized Radon transform but also as a new reconstructing method for imaging systems in applied sciences.
本文研究了定义在圆锥体上的一类新的Radon变换,即圆锥Radon变换。在过去的十年里,人们对这种积分转换的兴趣激增,主要是因为它与核工业、国土安全、天体物理学等不同领域中使用的几种应用的数学模型有关。本文给出了关于函数在R3中开角固定、轴向固定的CRT表示的存在唯一性的新结果。该结果不仅可以作为一种新的广义Radon变换,而且可以作为一种新的成像系统重构方法。
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引用次数: 2
Mixture periodic GARCH models: Applications to exchange rate modeling 混合周期GARCH模型:在汇率建模中的应用
F. Hamdi, Saïd Souam
In this paper, we propose an extension of a mixture periodic ARCH model (MPARCH) to a mixture periodic GARCH model (MPGARCH), and provide some probabilistic properties of this class of models. An estimation method based on the Expectation-Maximization (EM) algorithm is proposed. Finally, it is applied to model the spot rates of the Algerian Dinar against the U.S.-Dollar and Euro. The empirical analysis demonstrates that the proposed mixture model yields the best performance among the competing models.
本文将混合周期ARCH模型(MPARCH)推广为混合周期GARCH模型(MPGARCH),并给出了这类模型的一些概率性质。提出了一种基于期望最大化(EM)算法的估计方法。最后,它被用于模拟阿尔及利亚第纳尔对美元和欧元的即期汇率。实证分析表明,本文提出的混合模型在竞争模型中具有最好的性能。
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引用次数: 10
Solar tower plant implementation in Northern Algeria: Technico economic assessment 阿尔及利亚北部太阳能塔式电站的实施:技术经济评估
Salah Boudaoud, A. Khellaf, Kamal MOHAMMEDI
The present work deals with the technical feasibility of central receiver system using solar tower technology. This technology is based on solar concentration ratio of up to 1000 suns that can supply solar process heat at higher temperatures of about 800°C. This technology has been under development since 1980s after the pioneering experience of Solar I and Solar II in USA and the Plataforma de Almeria in Spain during the period of 2000-2010. It has reached the commercial maturity and is full expansion. Algeria is very rich in solar energy resources. It possesses large unpopulated and unproductive land in the Sahara which represents 80% of the total country area. This makes the country an ideal place for the implementation of the concentrating Solar Thermal Power Plant technologies (STPP). Algeria has expressed a high interest in developing its solar energy resources. To this end, it has introduced a program where solar thermal energy plays a central role. In order to study the viability of STPP under Algerian climate, we present here a technico economic assessment of a solar tower power pilot plant located in Tipaza near Algiers. Using the economical, technical, meteorological and radiometric data, we have carried a simulation of the STPP under SAM Advisor Software. The results show that for a net annual energy of about 1 MW, the levelized cost of electricity (LCOE) is about 0.1$/kWh which is relatively high in comparison with the LCOE of fossil power plant (0.04 $/kWh). However by increasing the plant power from 10 to 100 MW, the results indicate that the LCOE is drastically reduced. This suggests that, at high power, STPP can be competitive with conventional power plant.
本文研究了利用太阳能塔技术的中央接收系统的技术可行性。该技术基于高达1000个太阳的太阳能集中比,可以在约800°C的高温下提供太阳能过程热。这项技术自20世纪80年代以来一直在发展,在2000年至2010年期间,美国Solar I和Solar II以及西班牙Almeria平台的开创性经验。已达到商业成熟期,正处于全面拓展阶段。阿尔及利亚的太阳能资源非常丰富。它在撒哈拉沙漠拥有大片无人居住和贫瘠的土地,占该国总面积的80%。这使得该国成为实施聚光太阳能热电厂技术(STPP)的理想场所。阿尔及利亚对开发其太阳能资源表示了高度兴趣。为此,它引入了一个太阳能热能发挥核心作用的项目。为了研究STPP在阿尔及利亚气候条件下的可行性,我们在这里对位于阿尔及尔附近的蒂帕扎的太阳能塔式发电试点工厂进行了技术经济评估。我们利用经济、技术、气象和辐射数据,在SAM Advisor软件下进行了一次模拟。结果表明,对于1 MW左右的年净能源,其平准化电力成本(LCOE)约为0.1美元/千瓦时,与化石电厂的平准化电力成本(0.04美元/千瓦时)相比,相对较高。然而,通过将电厂功率从10兆瓦增加到100兆瓦,结果表明LCOE大大降低。这表明,在高功率下,STPP可以与传统发电厂竞争。
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引用次数: 3
A metaheuristic for solving the single-product/single-robot hoist scheduling problem under environmental costs 环境成本下单产品/单机器人提升机调度问题的元启发式求解
Rym Ben Othmen, S. H. Gabbouj, T. Ladhari
Our research suggests an approach based on the tabu search with Pareto dominance for solving the problem of the single-product/single-robot Hoist Scheduling Problem with consideration of environmental costs. Computational results are presented to test and evaluate the proposed algorithm.
针对考虑环境成本的单产品/单机器人提升机调度问题,提出了一种基于Pareto优势的禁忌搜索方法。给出了计算结果来测试和评估所提出的算法。
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引用次数: 0
A clustering based simulated annealing approach for solving an un-capacitated single allocation p-hub location problem 基于聚类的模拟退火方法求解无能力单分配p-hub选址问题
Zeinab Rasoulinejad, M. Bashiri, Masoud Mehrbanfar
Hub location problems play main role in large transportation systems and logistic environments. Its applications in real worlds cause that many researchers continue their attentions on this problem. In this paper clustering is applied as a heuristic method to improve the performance of simulated annealing algorithm for solving an un-capacitated single allocation p-hub location problem (USApHLP). For better illustration of the proposed clustering based Simulated Annealing (CbSA) approach, some numerical examples have been solved and the results have been reported in this paper. The comparisons show that CbSA algorithm outperforms the classic simulated annealing approach for the USApHLP.
枢纽选址问题在大型运输系统和物流环境中起着重要的作用。它在现实世界中的应用引起了许多研究者对这一问题的持续关注。本文将聚类作为一种启发式方法来改进模拟退火算法求解无能力单分配p-hub定位问题的性能。为了更好地说明所提出的基于聚类的模拟退火(CbSA)方法,本文求解了一些数值算例并报道了结果。比较表明,CbSA算法优于经典的USApHLP模拟退火方法。
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引用次数: 2
Effect of the design moldboard on the tillage forces 设计模式对耕作力的影响
A. Ibrahmi, H. Bentaher, A. Maalej
Finite element modeling FEM was used to simulate the cutting process of the soil using a moldboard and investigate the effect of its design parameters on the tillage forces. The moldboard body design was generated with the SolidWorks design software using a mathematical model that describes the relationship between its design parameters (alpha angle, beta angle, theta and gamma angle). For the FEM, the soil was represented by elasto-plastic model. Whereas, the design carried of the plow bodies, corresponding each to these parameters, were introduced into the software Abaqus as a discrete rigid body with a reference point at the end of the moldboard. At this tip, the reaction force with its three orthogonal components was calculated. The results showed an important effect of these parameters (gamma angleγ, theta θ, alpha α and beta β) that have a significant effect on the predicted results of the tillage force and on the specific force. To optimize tillage equipment designs for energy saving. They have to be combined with experimental results concerning the needed effect of the tillage process.
采用有限元模拟方法,模拟了犁板对土壤的切削过程,研究了犁板设计参数对耕作力的影响。模板主体设计是用SolidWorks设计软件生成的,使用数学模型来描述其设计参数(α角、β角、θ角和γ角)之间的关系。在有限元分析中,采用弹塑性模型表示土体。而与这些参数相对应的犁体的设计载体则作为一个离散刚体引入Abaqus软件,并在模板的末端有一个参考点。在这一点上,计算了三个正交分量的反作用力。结果表明,这些参数(γ角、θ、α和β)对耕作力的预测结果和比力有显著影响。优化耕作设备的节能设计。它们必须与有关耕作过程所需效果的实验结果相结合。
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引用次数: 0
On one approach for solving of some class of multiobjective optimization problems with interval coefficients 一类区间系数多目标优化问题的一种求解方法
Sharif E. Guseynov, S. Drobyshev
In present paper a multicriterion linear programming problem under interval indeterminacy is investigated, when the coefficients of the models' significant constraints can take any value from the specified intervals, at that significance of criteria are not known a priori. We use the weighted sum method to reduce the original multicriterion problem to single-criterion interval problem, in which the criterion is a strictly convex combination of the original criteria. It was revealed that widely known weights coefficients' estimation algorithm using the mechanism of doubling and bisection can lead to cycling that has led to necessity of its modification. Received interval single-criterion linear programming problem is intrinsically a parametric family of deterministic linear programming problems. Proposed approach consists in finding such common solution (so-called universal solution) to all problems of family that would satisfy the constraints of the problem accurate within the minimal residuals norm. With the help of the duality theory, a solvability of the reduced interval single-criterion problem is proved. For practical application of the foregoing approach for solving of the reduced interval single-criterion problem, the Big M Simplex method is used. It was concluded that solvability condition/Big M number lower estimate for the interval linear programming general problem, discovered in the literature are doubtful enough. In addition, we develop the appropriate software for computer implementation of the obtained theoretical results of this paper.
本文研究了区间不确定下的多准则线性规划问题,当模型的显著性约束的系数可以取给定区间内的任意值,且准则的显著性是先验未知的。利用加权和方法将原多准则问题简化为单准则区间问题,其中准则是原准则的严格凸组合。结果表明,常用的加权系数估计算法采用加倍和平分的方法,会导致循环,因此有必要对其进行修正。接收区间单准则线性规划问题本质上是一个参数族的确定性线性规划问题。所建议的方法是寻找这样的共同解决方案(所谓的普遍解决方案),所有的家庭问题,将满足问题的约束精确在最小残差范数。利用对偶理论,证明了简化区间单准则问题的可解性。对于上述方法在求解简化区间单准则问题中的实际应用,采用了大M单纯形方法。研究了文献中发现的区间线性规划一般问题的可解性条件/大M数下估计是值得怀疑的。此外,我们还开发了相应的软件用于计算机实现本文所得到的理论结果。
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引用次数: 0
Dynamic group transit scheme for corridor transit 走廊运输的动态群运方案
O. Vanek, M. Pechoucek
Contemporary maritime piracy around the Horn of Africa presents a serious threat to the global shipping industry. A number of countermeasures were deployed to minimize the probability of a successful hijack, one of them being the establishment of the International Recommended Transit Corridor (IRTC). Currently, all ships transiting the Gulf of Aden are strongly recommended to follow the IRTC and take part in group transit schemes-prescribed schedules stating time of arrival to the beginning of the corridor and speed at which to sail through the corridor. These schedules are fixed in advance and do not take into account speeds and constraints of arriving ships. We propose dynamic grouping schemes, customized schedules for a group of arriving ships, which take into account speeds as well as positions of arriving ships. The problem of finding optimum grouping scheme for a group of arriving ships is formulated as a bi-objective mixed integer program, weighting the delay caused by the grouping scheme and the risk taken when sailing alone. We look for a set of Pareto optimal solutions and compare the dynamic grouping scheme with currently deployed fixed scheme. Results show an improvement over current grouping scheme with respect to the number of ships grouped as well as time saved.
当代非洲之角一带的海盗活动对全球航运业构成严重威胁。为尽量减少成功劫机的可能性,采取了若干对策,其中之一是建立国际建议过境走廊。目前,强烈建议所有通过亚丁湾的船只遵循IRTC并参加集体过境计划- -规定的时间表,说明到达走廊起点的时间和通过走廊的速度。这些时间表是事先确定的,没有考虑到到达船只的速度和限制。我们提出了动态分组方案,为一组到达的船舶定制时间表,该计划考虑到到达船舶的速度和位置。将一群到达的船舶寻找最优分组方案的问题表述为一个双目标混合整数规划问题,并对分组方案造成的延误和单独航行时所承担的风险进行加权。我们寻找一组Pareto最优解,并将动态分组方案与现有的固定方案进行比较。结果表明,与现有的分组方案相比,该方案在分组船舶数量和节省时间方面有所改进。
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引用次数: 3
Modeling of solid oxide fuel cells (SOFCs): An overview 固体氧化物燃料电池(SOFCs)的建模:概述
Michael Lee, Gunhyung Park, V. Radisavljevic-Gajic
In this paper, the authors present an overview for modeling of solid oxide fuel cells. Even though, a large amount of literature of SOFCs has been published in the last decade, most of them has focused on electrochemical characteristics such as cell components, new materials, reaction mechanisms, etc. The review of modeling for SOFCs helps to simulate and understand effects of changing loads, temperature, fuel and air supply, diffusion, and design algorithms and feedback loops to control these variables.
本文对固体氧化物燃料电池的建模进行了综述。尽管近十年来发表了大量关于sofc的文献,但大多数都集中在电池组分、新材料、反应机理等电化学特性方面。对sofc建模的回顾有助于模拟和理解负载、温度、燃料和空气供应、扩散以及控制这些变量的设计算法和反馈回路的变化的影响。
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引用次数: 4
Integrated surface and departure management at airports by optimization 通过优化整合机场地面和离场管理
Dag Kjenstad, C. Mannino, P. Schittekat, Morten Smedsrud
A key challenge in Air Traffic Management is to provide a swift flow of airplanes at and near the airports. The pressure on existing airports will be higher as demand of air transport is predicted to increase over the next decades. Airline companies compete on delivering improved departure and arrival punctuality for their flights. In this paper we present experimental results where we are comparing the performance of traditional tower control decisions versus decisions supported by optimization technology in a simulation environment. We present a mathematical model for the integrated departure management and surface management problem and a solution algorithm based on a heuristic decomposition of the integrated problem. This represents a first attempt to solve the two problems simultaneously. Our approach is designed for dynamic rescheduling and real-time environment, with corresponding response time requirements. Finally, we present computational results that show significant improvements in punctuality and reductions in taxi times.
空中交通管理的一个关键挑战是在机场及其附近提供快速的飞机流动。由于预计未来几十年航空运输需求将会增加,现有机场的压力将会更大。航空公司在提高航班起飞和到达的准点率方面展开竞争。在本文中,我们提出了实验结果,我们在模拟环境中比较了传统塔台控制决策与优化技术支持的决策的性能。提出了一个综合出发管理和地面管理问题的数学模型,并给出了基于启发式分解的综合问题求解算法。这是同时解决这两个问题的第一次尝试。我们的方法是针对动态重调度和实时环境而设计的,具有相应的响应时间要求。最后,我们给出的计算结果显示,在准点率和出租车时间减少方面有显著改善。
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引用次数: 18
期刊
2013 5th International Conference on Modeling, Simulation and Applied Optimization (ICMSAO)
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