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

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Modelling a unified power flow controller for the study of power system steady state and dynamic characteristics 建立统一的潮流控制器,用于研究电力系统的稳态和动态特性
Kobibi Y. I. Djilani, H. Samir, Z. Ahmed, Mohammed Abdeldjalil Djehaf
The maintenance and reliability of the power system has become a major aspect of study. The encouragement to the construction of HV lines, the amount of power transmission/km on HV line and the amount of power transaction as seen from economic side is much responsible for concern towards congestion in power system. The solution is the use of FACTS devices especially the use of UPFC. In this paper the study of UPFC with its various modes of operation is understood. Second, the operation of control system used in its converters is also studied. Finally Using the UPFC simulation model established in SIMULINK, a dynamic simulation tool in MATLAB, take a simple power system with UPFC as an example. The simulation test has been conducted on a simple system composed of synchronous generator and infinite capacity bus, the steady state and transient characteristics of UPFC in this system are researched.
电力系统的维护与可靠性已成为研究的一个重要方面。从经济角度看,对高压线路建设的鼓励、高压线路的每公里输电量和电力交易量是电力系统拥堵问题的主要原因。解决方案是使用FACTS设备,特别是使用UPFC。本文对UPFC的各种工作模式进行了研究。其次,对其变流器控制系统的运行进行了研究。最后利用MATLAB中的动态仿真工具SIMULINK建立的UPFC仿真模型,以一个简单的UPFC电源系统为例。在一个由同步发电机和无限容量母线组成的简单系统上进行了仿真试验,研究了UPFC在该系统中的稳态和暂态特性。
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引用次数: 7
Design and implementation of Direct Torque Control of induction machine on FPGA 感应电机直接转矩控制的FPGA设计与实现
Soufien Gdaim, A. Mtibaa, M. Mimouni
This work, presents a design method of Direct Torque Control (DTC) of induction machine. Then a hardware description based on VHDL hardware description language of the design is presented and discussed. The techniques of parallel architecture, direct computation and modular architecture are adopted for the design of the controller. The Direct Torque Control is designed using Xilinx ISE software tool in addition to a Modelsim 6.5 software tool which is used for simulation purposes. The same algorithm is designed and simulated using MATLAB software tool to make a comparison with the proposed design on FPGA.
提出了一种异步电机直接转矩控制(DTC)的设计方法。然后提出并讨论了基于VHDL硬件描述语言的硬件描述。控制器的设计采用并行结构、直接计算和模块化结构。直接扭矩控制是使用Xilinx ISE软件工具以及用于仿真目的的Modelsim 6.5软件工具设计的。利用MATLAB软件工具对相同的算法进行了设计和仿真,并与FPGA上提出的设计进行了比较。
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引用次数: 6
Solution to an attack on digital signature in SMS security 针对短信安全中数字签名攻击的解决方案
N. Saxena, N. Chaudhari, Jaya Thomas
Short Message Service (SMS) is one of the mobile phone services widely used by the public worldwide. One of the main issues during the communication is information security and privacy. Digital Signature algorithms can be applied with the SMS cipher to prevent the message information from the repudiation attack. There are various existing algorithms for digital signature like RSA, DSA and ECDSA. Out of these, ECDSA has been proved and found the best algorithm in terms of efficiency and cryptanalysis. But ECDSA has some drawbacks also, and because of that some authors have proposed variant algorithms of ECDSA. In this paper, we propose solutions to an attack on digital signature that has been found on a variant of ECDSA. At the end of this paper, conclusion with the suitable solution approach with its security analysis is summarized.
短消息服务(SMS)是全球范围内广泛使用的移动电话服务之一。通信过程中的一个主要问题是信息安全和隐私。在短信密码中应用数字签名算法可以防止短信信息受到拒绝攻击。现有的数字签名算法有RSA、DSA、ECDSA等。其中,ECDSA算法在效率和密码分析方面得到了证明。但是ECDSA也有一些缺点,因此一些作者提出了ECDSA的变体算法。在本文中,我们提出了针对ECDSA变体上发现的数字签名攻击的解决方案。最后,总结了本文的结论,提出了合适的解决方法,并对其安全性进行了分析。
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引用次数: 7
Microscopic simulation study of transit signal priority implementation along an arterial corridor 主干道交通信号优先级实施的微观模拟研究
M. Ghanim, G. Abu-Lebdeh, K. Ahmed
Transit signal priority (TSP) is a control strategy that provides preferential treatments for transit vehicles. This strategy has shown potential to minimize delay with negligible or slight impact on non-transit vehicles. It is also an important strategy for improving and promoting schedule adherence and service reliability. This paper shows a microscopic simulation study to identify the impact of implementing TSP strategies on an arterial corridor segment at Michigan State University. The chosen segment is one of the busiest corridors on campus. It experiences vehicular traffic, pedestrian movements, and transit routes. It has four signalized intersection, and one pedestrian semi-actuated signal. Three peak periods were modeled; morning, midday, and evening. Microscopic simulation modeling is done in VISSIM microscopic simulation environment. TSP functions are programmed using vehicle actuated programming (VAP) to evaluate different TSP parameters, such as maximum green extension and red truncation. Simulation results show that transit vehicles benefit from the provided preferential treatment. On the other hand, TSP has minimal negative impact for on general traffic. In terms of TSP impact on pedestrians, TSP has no negative impact on pedestrians. The study also shows that the expected benefits from TSP depend on the congestion level, where less benefit could be gained when the congestion level is higher.
公交信号优先(TSP)是一种为公交车辆提供优先处理的控制策略。这一策略已显示出可能最大限度地减少延误,而对非过境车辆的影响可以忽略不计或微乎其微。这也是改善和提高调度依从性和服务可靠性的重要策略。本文展示了一项微观模拟研究,以确定实施TSP策略对密歇根州立大学动脉走廊段的影响。选择的部分是校园里最繁忙的走廊之一。它经历了车辆交通、行人运动和过境路线。它有四个信号交叉口,一个行人半驱动信号。模拟了三个高峰时期;早上,中午,晚上。在VISSIM微观仿真环境下进行微观仿真建模。利用车辆驱动编程(VAP)对TSP函数进行编程,以评估不同的TSP参数,如最大绿色扩展和红色截断。仿真结果表明,公交车辆受益于所提供的优惠待遇。另一方面,TSP对一般交通的负面影响最小。在TSP对行人的影响方面,TSP对行人没有负面影响。研究还表明,TSP的预期收益取决于拥塞程度,拥塞程度越高,获得的收益越少。
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引用次数: 11
Cycle-Service-Level in Guaranteed-Service supply chains 保证服务供应链中的周期服务水平
Ayse Sena Eruguz, Z. Jemai, E. Sahin, Y. Dallery
The Guaranteed-Service Model (GSM) aims at determining the optimal placement and amount of safety stocks in a guaranteed-service supply chain. In the GSM, safety stocks are used to protect against demand variability up to specified demand bounds. The model does not address what happens when demand exceeds these bounds while in practice, companies might take extraordinary measures to handle the excess demand. For guaranteed-service supply chains, assessing the service level that results from carrying safety stocks is crucial to estimate the real frequency of extraordinary measures to be deployed. In the GSM literature, demand bounds are usually defined in terms of Cycle-Service-Level (CSL). Simulation studies we carried for realworld supply chains show that the effectively observed CSL at final customer stages may be less than the one used to define the demand bounds and the absolute gap may be up to 4.76%.
保证服务模型(GSM)旨在确定保证服务供应链中安全库存的最佳位置和数量。在GSM中,安全库存用于防止需求变化,直到指定的需求界限。该模型没有解决当需求超过这些界限时会发生什么,而在实践中,企业可能会采取非常措施来应对过剩需求。对于保证服务供应链来说,评估安全库存带来的服务水平对于估计需要部署的特殊措施的实际频率至关重要。在GSM文献中,需求界限通常根据周期服务水平(CSL)来定义。我们对现实世界供应链进行的模拟研究表明,在最终客户阶段有效观察到的CSL可能小于用于定义需求界限的CSL,绝对差距可能高达4.76%。
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引用次数: 7
A Variable Neighborhood Descent for solving the Single Machine Total Weighted Tardiness Problem 求解单机总加权延迟问题的变邻域下降法
Hiba Yahyaoui, S. Krichen, B. Derbel, E. Talbi
In this paper a Variable Neighborhood Descent (VND) approach, is developed to solve the Single Machine Total Weighted Tardiness Problem (SMTWTP). New strategy was proposed to select iteratively the accurate neighborhood. Our approach was compared to VND state-of-the-art approaches. Statistical tests were also applied on the empirical results, to show that the DR_VND outperforms the proposed approaches for 72 % of instances for the SMTWTP. The proposed approach was applied on a real case.
提出了一种求解单机总加权延迟问题的变邻域下降方法。提出了迭代选择精确邻域的新策略。我们的方法与VND最先进的方法进行了比较。还对经验结果进行了统计测试,以表明在SMTWTP的72%的实例中,DR_VND优于所建议的方法。将该方法应用于一个实际案例。
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引用次数: 7
Metaheuristic algorithms comparison for the LC - Voltage controlled oscillators optimal design LC -电压控制振荡器优化设计的元启发式算法比较
P. Pereira, M. Kotti, H. Fino, M. Fakhfakh
The goal of this paper is to present a comparison among three known metaheuristics: Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Simulated Annealing (SA). For the comparison, the design of an LC - Voltage Controlled Oscillator (LC-VCO) is considered, where the minimization of both VCO phase noise and power consumption is envisaged. The objective of this comparison is to find the algorithm yielding the best solution. The validity of the solution obtained with each metaheuristic algorithm is checked against HSPICE/RF simulation results. Robustness checks for each algorithm are presented at the end of this paper.
本文的目的是比较三种已知的元启发式算法:遗传算法(GA),粒子群优化(PSO)和模拟退火(SA)。为了进行比较,考虑了LC-电压控制振荡器(LC-VCO)的设计,其中设想了最小化VCO相位噪声和功耗。这种比较的目的是找到产生最佳解的算法。通过HSPICE/RF仿真结果验证了各元启发式算法解的有效性。本文最后给出了各算法的鲁棒性检验。
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引用次数: 4
Multicriteria fuzzy clustering for brain image segmentation 多准则模糊聚类脑图像分割
Olfa Limam, F. Ben Abdelaziz
One of the most challenging task in image analysis is to identify correctly tissues where boundaries are generally not clear. Fuzzy clustering is supposed to be the most appropriate to model this situation in applications such as tissue classification, tumor detection. While, image segmentation using fuzzy clustering technique classifies correctly pixels of an image with a great extent of accuracy [1], recent works have shown that fuzzy clustering techniques considers a single objective may not provide a good result since no single validity measure works well on different kinds of data sets. Moreover, a wrong choice of a validity measure leads to poor results [2]. In this paper, we introduce a multiobjective fuzzy clustering approach producing a set of Pareto solutions among which the best solution, based on I-index validation measure, is chosen to be the final clustering solution. First, a spatial information is considered to deal more effectively with the noise and intensity inhomogeneities introduced in imaging process. Second, we propose to use a variable string length encoding technique to automatically identify the number of clusters, given that it does not require a prior knowledge about number of clusters present in a data set. Therefore, an initializing method based on a center approximation approach is proposed to accelerate the clustering process and make results more robust. Applied to normal and multiple sclerosis lesion magnetic resonance image brain images, our method shows better performance than competing algorithms.
图像分析中最具挑战性的任务之一是正确识别边界通常不清楚的组织。在组织分类、肿瘤检测等应用中,模糊聚类被认为是最适合模拟这种情况的方法。虽然使用模糊聚类技术的图像分割能够以很高的精度对图像的像素进行正确分类[1],但最近的研究表明,模糊聚类技术考虑单一目标可能无法提供良好的结果,因为没有单一的有效性度量可以很好地适用于不同类型的数据集。此外,效度测量的选择错误会导致结果不佳[2]。本文引入一种多目标模糊聚类方法,生成一组Pareto解,并根据i -指标验证度量选择其中的最优解作为最终聚类解。首先,考虑空间信息可以更有效地处理成像过程中引入的噪声和强度不均匀性。其次,我们建议使用可变字符串长度编码技术来自动识别簇的数量,因为它不需要关于数据集中存在的簇数量的先验知识。为此,提出了一种基于中心逼近的初始化方法,以加快聚类过程,提高聚类结果的鲁棒性。将该方法应用于正常和多发性硬化症病变的脑磁共振图像中,结果表明该方法的性能优于同类算法。
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引用次数: 8
An arc flow model for the two stages variable size cutting stock problem 两级变尺寸切削料问题的弧流模型
Ines Meftehi, Mehdi Mrad
We consider a two dimensional guillotine cutting stock problem with variable size of stocks. We have a set of items that have to be cut out of stock sheets with different sizes and costs. We aim to minimize the total cost of used stocks. We propose an arc flow model to handle this problem based on the work of Marcedo et al.[14]. The model was implemented in CPLEX and tested on variety of instances.
考虑了变料尺寸的二维切料问题。我们有一组产品需要从不同尺寸和成本的库存单上裁下来。我们的目标是尽量减少旧库存的总成本。我们在Marcedo等人[14]的基础上提出了一种弧形流动模型来处理这一问题。该模型在CPLEX中实现,并在各种实例上进行了测试。
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引用次数: 0
Automatic Web services composition using maude strategies 使用模式策略自动组合Web服务
Latreche Fateh, Sebih Hacene, B. Faiza
Web services are modular, self-descriptive and loosely coupled applications; they provide a simple programming and deployment model. Besides, they are designed to interact with other services to form larger applications. From a software engineering point of view, the construction of new services by composing existing services raises a number of challenges. One of them is the ability to efficiently and effectively select and integrate inter-organizational and heterogeneous services on the Web at runtime. Recently, several formal methods, most of them with a semantics based on transition systems, have been used to guarantee correct service compositions without insisting on its automation. The main goal of this work is to propose a Rewriting Logic based framework in order to enhance automatic Web services composition. The proposed model execution allows to discover services automatically and guarantee the correct interaction of independent pieces of software in a transparent manner.
Web服务是模块化的、自描述的、松耦合的应用程序;它们提供了一个简单的编程和部署模型。此外,它们被设计成与其他服务交互以形成更大的应用程序。从软件工程的角度来看,通过组合现有服务来构建新服务会带来许多挑战。其中之一是在运行时高效地选择和集成Web上的组织间和异构服务的能力。最近,已经使用了几种形式化方法(其中大多数具有基于转换系统的语义)来保证正确的服务组合,而不坚持其自动化。这项工作的主要目标是提出一个基于重写逻辑的框架,以增强自动Web服务组合。建议的模型执行允许自动发现服务,并以透明的方式保证独立软件部分的正确交互。
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引用次数: 0
期刊
2013 5th International Conference on Modeling, Simulation and Applied Optimization (ICMSAO)
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