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2012 UKSim 14th International Conference on Computer Modelling and Simulation最新文献

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Frequency Survey Simulation for Developing Novel Radio Frequency Energy Harvesting Model 开发新型射频能量收集模型的频率测量仿真
H. Elanzeery, R. Guindi
Renewable Energy sources are the center of attraction for research and development all over the world nowadays, the demand of a lasting cheap source of energy that is environmental friendly, is the main challenge recently. Energy Harvesting is a new technology that is going to make a revolution in the coming decade. Energy Harvesting is a technique to provide alternative sources of energy that are environmental friendly and low in cost. Radio Frequency Energy Harvesting is one of the methods to provide electrical energy from the ambient Radio Frequency waves that already exists in the environment. Radio Frequency Energy Harvesting can provide a world with battery less devices. With Radio Frequency (RF) Energy Harvesting, the true mobility can be achieved where mobile devices do not depend on centralized power sources for charging, instead they make use of the existing energy in the environment. This paper presents a simulation survey on different frequencies and the effect of these frequencies on the output power efficiency. The simulation results provide an optimum novel relationship between the frequency used and the size of the circuit for a radio frequency energy harvesting model with optimum output efficiency.
可再生能源是当今世界各国研究和开发的热点,对一种持久、廉价、环保的能源的需求是当今世界面临的主要挑战。能量收集是一项新技术,将在未来十年带来一场革命。能量收集是一种提供替代能源的技术,既环保又低成本。射频能量收集是从环境中已经存在的射频波中提供电能的方法之一。射频能量收集可以提供一个无电池设备的世界。有了射频(RF)能量收集,真正的移动性可以实现,移动设备不依赖于集中的电源充电,而是利用环境中的现有能量。本文对不同频率下的输出功率效率进行了仿真研究,并分析了这些频率对输出功率效率的影响。仿真结果为具有最佳输出效率的射频能量收集模型提供了一种新颖的频率与电路尺寸之间的最佳关系。
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引用次数: 8
User Perception of the Physical & Behavioral Realism of a Maritime Virtual Reality Environment 用户感知海洋虚拟现实环境的物理和行为现实性
D. Sandaruwan, N. Kodikara, C. Keppitiyagama, R. Rosa, M. Jayawardena, P. Samarasinghe
Perception enhanced real-time Virtual Reality (VR) applications are used in various fields such as education and entertainment. The physical and behavioral realism of such applications are important in different perspectives. We have developed a perception enhanced real-time VR solution for maritime applications such as naval training, water way designs and simulate military scenes. In this paper, we present brief description of a six degrees of freedom (6-DOF) real-time mathematical ship motion simulation model and validation techniques for physical/ behavioral realism of a perception enhanced maritime VR environment. The user perceived physical and behavioral realism of the VR solution is investigated with user tests and preliminary results are presented.
增强感知的实时虚拟现实(VR)应用广泛应用于教育和娱乐等各个领域。这些应用程序的物理和行为现实性在不同的角度都很重要。我们已经开发了一种感知增强的实时VR解决方案,用于海事应用,如海军训练,水路设计和模拟军事场景。在本文中,我们简要介绍了一个六自由度(6-DOF)实时数学船舶运动仿真模型和验证技术,用于增强感知的海上VR环境的物理/行为真实感。通过用户测试,研究了用户感知的虚拟现实解决方案的物理和行为真实感,并给出了初步结果。
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引用次数: 9
Applying SAQ-Learning Algorithm for Trading Agents in Bilateral Bargaining 交易主体在双边议价中的应用
S. Jamali, K. Faez
In this research we use a learning method called SAQ-Learning to use for agents in a single-issue bargaining process. SAQ-Learning algorithm is an improved version of Q-Learning algorithm that benefits from the Metropolis criterion of Simulated Annealing (SA) algorithm to overcome the challenge of finding a balance between exploration and exploitation. Q-Learning is one the most important types of Reinforcement Learning (RL) because of the fact that it does not need the transition model of the environment. Artificial Intelligence (AI) approaches have attracted interest in solving bargaining problem. This is because Game Theory (GT) needs some unrealistic assumptions to solve bargaining problem. Presence of perfectly rational agents is an example of these assumptions. Therefore by designing SAQ-Learning agents to bargain with each other over price, we gained higher performance in case of settlement rate, average payoff, and the time an agent needs to find his optimal policy. This learning method can be a suitable learning algorithm for automated online bargaining agents in e-commerce.
在本研究中,我们使用了一种称为SAQ-Learning的学习方法,用于代理在单一问题的讨价还价过程中。SAQ-Learning算法是Q-Learning算法的改进版本,它利用了模拟退火算法的Metropolis准则来克服在探索和利用之间寻找平衡的挑战。Q-Learning是强化学习(RL)最重要的类型之一,因为它不需要环境的过渡模型。人工智能(AI)方法已引起人们对解决议价问题的兴趣。这是因为博弈论(GT)需要一些不切实际的假设来解决议价问题。完全理性主体的存在就是这些假设的一个例子。因此,通过设计SAQ-Learning agent进行价格讨价还价,我们在结算率、平均收益和agent找到最优策略所需时间的情况下获得了更高的性能。这种学习方法可以作为电子商务中自动在线议价代理的一种合适的学习算法。
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引用次数: 1
Identification of Cardiac Ischemia Using Spectral Domain Analysis of Electrocardiogram 利用心电图谱域分析识别心脏缺血
R. Valupadasu, B. R. Chunduri
India has highest incidence of heart related diseases in the world. If no initiative is taken to check the disease the most predictable and preventable among all chronic diseases, India will have 62 million heart patients by 2015. Myocardial ischemia (also known as angina) is a heart condition caused by a temporary lack of oxygen-rich blood to the heart. Cardiac ischemia (CI) is a heart disease that covers heart issues caused by narrowing of the arteries which makes less oxygenated blood to reach the heart muscle. This may lead to heart attack with no prior warning. This paper introduces the work that has been done to distinguish the Electrocardiogram (ECG) of a normal healthy human from that of an ischemia patient. Fast Fourier Transform (FFT) on ECG Signal was used to extract information and providing the basis with which a signal suggesting predisposition of the patient who suffers from Cardiac ischemia. The main aim is to design algorithm that enable the doctors to diagnose cardiac ischemia on the basis of spectral analysis of an ECG signal. 4 min. of ECG of any patient is enough to detect possibility of ischemia. Normal Sinus Rhythm Data is obtained from MIT-BIH NSR Database. Ischemia data is obtained from European ST-T Database. The data is taken for duration of 1 hour. The algorithm was tested on MIT-BIH database and European ST-T Database and the verification of results using MATLAB is done. This concept can be utilized to analyze ECG signals to identify other heart diseases.
印度是世界上心脏病发病率最高的国家。心脏病是所有慢性病中最可预测和最可预防的疾病,如果不采取行动控制这种疾病,到2015年印度将有6200万心脏病患者。心肌缺血(也称为心绞痛)是一种由心脏暂时缺乏富氧血液引起的心脏病。心脏缺血(CI)是一种心脏疾病,包括由动脉狭窄引起的心脏问题,动脉狭窄使缺氧的血液无法到达心脏肌肉。这可能会导致心脏病发作,没有事先警告。本文介绍了在区分正常健康人的心电图和缺血病人的心电图方面所做的工作。利用心电信号的快速傅里叶变换(FFT)提取信息,为心脏缺血易感信号提供依据。主要目的是设计一种算法,使医生能够根据心电信号的频谱分析来诊断心脏缺血。任何病人4分钟的心电图就足以检测出缺血的可能性。正常窦性心律数据来自MIT-BIH NSR数据库。缺血数据来源于欧洲ST-T数据库。数据采集周期为1小时。在MIT-BIH数据库和欧洲ST-T数据库上对算法进行了测试,并用MATLAB对结果进行了验证。这个概念可以用来分析心电信号,以识别其他心脏疾病。
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引用次数: 1
A Large Scale Digital Simulation of Spiking Neural Networks (SNN) on Fast SystemC Simulator 基于Fast SystemC模拟器的脉冲神经网络(SNN)大规模数字仿真
Pub Date : 2012-03-28 DOI: 10.1109/UKSIM.2012.105
H. Soleimani, A. Ahmadi, Mohammad Bavandpour, A. Amirsoleimani, Mark Zwolinski
Since biological neural systems contain big number of neurons working in parallel, simulation of such dynamic system is a real challenge. The main objective of this paper is to speed up the simulation performance of SystemC designs at the RTL abstraction level using the high degree of parallelism afforded by graphics processors (GPUs) for large scale SNN with proposed structure in pattern classification field. Simulation results show 100 times speedup for the proposed SNN structure on the GPU compared with the CPU version. In addition, CPU memory has problems when trained for more than 120K cells but GPU can simulate up to 40 million neurons.
由于生物神经系统包含大量并行工作的神经元,因此对这种动态系统的仿真是一个真正的挑战。本文的主要目的是利用图形处理器(gpu)提供的高度并行性,在RTL抽象层加速SystemC设计的仿真性能,用于模式分类领域中具有所提出结构的大规模SNN。仿真结果表明,与CPU版本相比,所提出的SNN结构在GPU上的速度提高了100倍。此外,CPU内存在训练超过12万个细胞时存在问题,但GPU可以模拟多达4000万个神经元。
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引用次数: 1
Path Loss Effect on Energy Consumption in a WSN 路径损耗对无线传感器网络能耗的影响
Krishna Doddapaneni, E. Ever, O. Gemikonakli, I. Malavolta, L. Mostarda, H. Muccini
Energy consumption of nodes is a crucial factor that constrains the networks life time for Wireless Sensor Networks (WSNs). WSNs are composed of small sensors equipped with low-power devices, and have limited battery power supply. The main concern in existing architectural and optimisation studies is to prolong the network lifetime. The lifetime of the sensor nodes is affected by different components such as the microprocessor, the sensing module and the wireless transmitter/receiver. The existing works mainly consider these components to decide on best deployment, topology, protocols and so on. Recent studies have also considered the monitoring and evaluation of the path loss caused by environmental factors. Path loss is always considered in isolation from the higher layers such as application and network. It is necessary to combine path loss computations used in physical layer, with information from upper layers such as application layer for a more realistic evaluation. In this paper, a simulation-based study is presented that uses path-loss model and application layer information in order to predict the network lifetime. Physical environment is considered as well. We show that when path-loss is introduced, increasing the transmission power is needed to reduce the amount of packets lost. This presents a tradeoff between the residual energy and the successful transmission rate when more realistic settings are employed for simulation. It is a challenging task to optimise the transmission power of WSNs, in presence of path loss, because although increasing the transmission power reduces the residual energy, it also reduces the number of retransmissions required.
对于无线传感器网络(WSNs)来说,节点的能量消耗是制约网络寿命的关键因素。无线传感器网络由配备低功耗器件的小型传感器组成,并且电池供电有限。在现有的架构和优化研究中,主要关注的是延长网络生命周期。传感器节点的寿命受到不同组件的影响,如微处理器、传感模块和无线发射器/接收器。现有的工作主要考虑这些组件来决定最佳部署、拓扑、协议等。近年来的研究也开始考虑对环境因素造成的路径损失进行监测和评价。路径损耗总是与应用程序和网络等更高层隔离考虑。有必要将物理层的路径损失计算与应用层等上层的信息结合起来进行更真实的评估。本文提出了一种基于仿真的研究方法,利用路径损失模型和应用层信息来预测网络的生存期。物理环境也被考虑在内。我们表明,当引入路径损耗时,需要增加传输功率来减少数据包的丢失。当采用更真实的设置进行仿真时,这就提出了在剩余能量和成功传输速率之间的权衡。在存在路径损耗的情况下,优化无线传感器网络的传输功率是一项具有挑战性的任务,因为尽管增加传输功率减少了剩余能量,但也减少了所需的重传次数。
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引用次数: 19
A Novel Algorithm for Linear Programming 一种新的线性规划算法
K. Eswaran
The problem of optimizing a linear objective function, given a number of linear constraints has been a long standing problem ever since the times of Kantorovich, Dantzig and John von Neumann. These developments have been followed by a different approach pioneered by Khachiyan and Karmarkar. In this paper we attempt a new approach for solving an old optimization problem in a novel manner, in the sense that we devise a method that reduces the dimension of the problem step by step and interestingly is recursive. The method can be extended to other types of optimization problems in convex space, e.g. for solving a linear optimization problem subject to nonlinear constraints in a convex region.
自康托洛维奇、丹齐格和约翰·冯·诺伊曼时代以来,在给定一定数量的线性约束条件下,优化线性目标函数的问题一直是一个长期存在的问题。在这些发展之后,kachiyan和Karmarkar开创了一种不同的方法。在本文中,我们尝试用一种新的方法来解决一个老的优化问题,在某种意义上,我们设计了一种逐步降低问题维数的方法,有趣的是,它是递归的。该方法可以推广到其他类型的凸空间优化问题,例如求解凸区域中非线性约束下的线性优化问题。
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引用次数: 0
Comparison of Different Artificial Neural Networks for Brain Tumour Classification via Magnetic Resonance Images 不同人工神经网络对脑肿瘤磁共振图像分类的比较
Yawar Rehman, C. F. Azim
Artificial Neural Network algorithms has been tested for the classification of patterns and best among them was implemented for the application of brain tumour classification as specified by World Health Organization standards via 2D MR images. The technique of Rajasekaran and Pai (sBAM) was found to give most successful results of classifying tumour into their correct classes. The computation time taken by sBAM was also less as compared with other algorithms. sBAM technique wasn't tested on brain tumour MR images before but when it is subjected to test, it provided prominent results. The success rate of sBAM was also relatively high with its counterparts.
人工神经网络算法已经被测试用于模式分类,其中最好的是通过二维磁共振图像实现世界卫生组织标准规定的脑肿瘤分类应用。Rajasekaran和Pai (sBAM)技术被发现给出了最成功的将肿瘤分类到正确类别的结果。与其他算法相比,sBAM的计算时间也更短。sBAM技术之前没有在脑肿瘤MR图像上进行过测试,但当它接受测试时,它提供了显著的结果。与同类机构相比,sBAM的成功率也相对较高。
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引用次数: 7
Formant Analysis and Mathematical Model of Kazakh Vowels 哈萨克语元音的构象分析与数学模型
Zhandos Yessenbayev, Muslima Karabalayeva, A. Sharipbayev
The traditional classification of Kazakh vowels, the most complicated objects in Kazakh phonetics, is somewhat inadequate in that it does not uniquely identify each vowel. Moreover, the formant structure of the vowels has not been investigated yet, which would potentially be useful in many applications regarding speech processing. In this work a formant analysis of Kazakh vowels is performed. This analysis suggests a new natural classification system which precisely describes each vowel. The proposed classification is supported by the membership function introduced and by the geometric interpretation derived from the constructed vowel space. Further, from this mathematical model some linguistic statements are inferred, which are related to the real phonological processes.
哈萨克语元音是哈萨克语语音学中最复杂的对象,传统的哈萨克语元音分类存在一定的不足,因为它没有唯一地识别每个元音。此外,元音的形成峰结构尚未被研究,这在语音处理的许多应用中可能是有用的。在这项工作中,对哈萨克语元音进行了构音分析。这种分析提出了一种新的自然分类系统,可以精确地描述每个元音。所提出的分类方法由引入的隶属函数和由所构造的元音空间导出的几何解释支持。此外,从这个数学模型可以推断出一些与真实语音过程有关的语言陈述。
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引用次数: 12
Improving Settling and Rise Times of Controllers via Intelligent Algorithms 通过智能算法改善控制器的沉降和上升时间
D. Pelusi
Generally, conventional controllers are characterized by too longs settling and rise times. In order to solve this problem, suitable fuzzy logic controllers have been designed. However, some intelligent techniques can be added during the controllers designing phase. In the literature, the employed methods are Genetic Algorithms and Neural Networks. The first ones are good search methods whereas the others ones have the capability to learn from data. In this paper, an optimized genetic-neuro-fuzzy controller is proposed. This controller works in according with a real-time optimization algorithm which optimally combines the features of Fuzzy Logic, Genetic Algorithms and Neural Networks. The genetic procedures search the optimal membership functions whereas the neural methods optimize the fuzzy rules. The target is to reduce the settling time and rise time with overshoot equal to zero. The novelty of this approach is that the optimization procedures occur at the same time and not separately. The results show that the settling time and the rise time are reduced by comparing them with the same quantities of optimized PD and PID controllers. Moreover, the designed controller improves the timing performance of conventional and intelligent controllers.
一般来说,传统控制器的特点是沉降和上升时间过长。为了解决这一问题,设计了合适的模糊逻辑控制器。但是,在控制器设计阶段可以加入一些智能化技术。在文献中,采用的方法有遗传算法和神经网络。第一个是很好的搜索方法,而其他的有能力从数据中学习。本文提出了一种优化的遗传神经模糊控制器。该控制器采用一种实时优化算法,将模糊逻辑、遗传算法和神经网络的特点最优地结合起来。遗传算法搜索最优隶属函数,神经算法优化模糊规则。目标是减少沉降时间和上升时间,超调量为零。这种方法的新颖之处在于优化过程是同时进行的,而不是分开进行的。结果表明,与相同数量的优化PD控制器和PID控制器相比,其沉降时间和上升时间都有所减少。此外,所设计的控制器提高了传统控制器和智能控制器的定时性能。
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引用次数: 24
期刊
2012 UKSim 14th International Conference on Computer Modelling and Simulation
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