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Generalized Attack Model for Networked Control Systems, Evaluation of Control Methods 网络控制系统的广义攻击模型及其控制方法评价
Pub Date : 2017-07-18 DOI: 10.4236/ICA.2017.83013
A. Sargolzaei, K. Yen, M. Abdelghani, Alireza Abbaspour, S. Sargolzaei
Networked Control Systems (NCSs) have been implemented in several different industries. The integration with advanced communication networks and computing techniques allows for the enhancement of efficiency of industrial control systems. Despite all the advantages that NCSs bring to industry, they remain at risk to a spectrum of physical and cyber-attacks. In this paper, we elaborate on security vulnerabilities of NCSs, and examine how these vulnerabilities may be exploited when attacks occur. A general model of NCS designed with three different controllers, i.e., proportional-integral-derivative (PID) controllers, Model Predictive control (MPC) and Emotional Learning Controller (ELC) are studied. Then three different types of attacks are applied to evaluate the system performance. For the case study, a networked pacemaker system using the Zeeman nonlinear heart model (ZHM) as the plant combined with the above-mentioned controllers to test the system performance when under attacks. The results show that with Emotional Learning Controller (ELC), the pacemaker is able to track the ECG signal with high fidelity even under different attack scenarios.
网络控制系统(NCS)已经在几个不同的行业中实现。与先进的通信网络和计算技术的集成允许提高工业控制系统的效率。尽管NCS为行业带来了所有优势,但它们仍然面临着一系列物理和网络攻击的风险。在本文中,我们详细阐述了网络控制系统的安全漏洞,并研究了在发生攻击时如何利用这些漏洞。研究了用比例-积分-微分(PID)控制器、模型预测控制(MPC)控制器和情感学习控制器(ELC)三种不同控制器设计的网络控制系统的通用模型。然后应用三种不同类型的攻击来评估系统性能。在案例研究中,使用塞曼非线性心脏模型(ZHM)作为对象的网络起搏器系统与上述控制器相结合,以测试系统在受到攻击时的性能。结果表明,使用情绪学习控制器(ELC),即使在不同的攻击场景下,起搏器也能够高保真地跟踪ECG信号。
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引用次数: 8
An Improvement on Data-Driven Pole Placement for State Feedback Control and Model Identification 用于状态反馈控制和模型辨识的数据驱动极点配置的改进
Pub Date : 2017-07-18 DOI: 10.4236/ICA.2017.83011
Pyone Ei Ei Shwe, S. Yamamoto
The recently proposed data-driven pole placement method is able to make use of measurement data to simultaneously identify a state space model and derive pole placement state feedback gain. It can achieve this precisely for systems that are linear time-invariant and for which noiseless measurement datasets are available. However, for nonlinear systems, and/or when the only noisy measurement datasets available contain noise, this approach is unable to yield satisfactory results. In this study, we investigated the effect on data-driven pole placement performance of introducing a prefilter to reduce the noise present in datasets. Using numerical simulations of a self-balancing robot, we demonstrated the important role that prefiltering can play in reducing the interference caused by noise.
最近提出的数据驱动极点放置方法能够利用测量数据同时识别状态空间模型并获得极点放置状态反馈增益。它可以精确地实现线性时不变和无噪声测量数据集可用的系统。然而,对于非线性系统,和/或当唯一可用的噪声测量数据集包含噪声时,这种方法无法产生令人满意的结果。在本研究中,我们研究了引入预滤波器以减少数据集中存在的噪声对数据驱动的极点放置性能的影响。通过对自平衡机器人的数值模拟,我们证明了预滤波在减少噪声干扰方面的重要作用。
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引用次数: 1
An Upper Limit for Iterative Learning Control Initial Input Construction Using Singular Values 奇异值迭代学习控制初始输入构造的一个上限
Pub Date : 2017-07-18 DOI: 10.4236/ICA.2017.83012
Naser Alajmi, Ali Alobaidly, Mubarak K. Alhajri, Salem H. Salamah, M. A. Alsubaie
Selecting a proper initial input for Iterative Learning Control (ILC) algorithms has been shown to offer faster learning speed compared to the same theories if a system starts from blind. Iterative Learning Control is a control technique that uses previous successive projections to update the following execution/trial input such that a reference is followed to a high precision. In ILC, convergence of the error is generally highly dependent on the initial choice of input applied to the plant, thus a good choice of initial start would make learning faster and as a consequence the error tends to zero faster as well. Here in this paper, an upper limit to the initial choice construction for the input signal for trial 1 is set such that the system would not tend to respond aggressively due to the uncertainty that lies in high frequencies. The provided limit is found in term of singular values and simulation results obtained illustrate the theory behind.
与相同的理论相比,如果系统从盲开始,为迭代学习控制(ILC)算法选择合适的初始输入可以提供更快的学习速度。迭代学习控制是一种控制技术,它使用以前的连续投影来更新下面的执行/试验输入,从而使参考达到高精度。在ILC中,误差的收敛性通常高度依赖于应用于对象的输入的初始选择,因此,良好的初始启动选择将使学习更快,因此误差也趋向于更快地归零。在本文中,试验1的输入信号的初始选择结构的上限被设置为使得系统不会由于高频中的不确定性而倾向于积极响应。所提供的极限是根据奇异值找到的,所获得的模拟结果说明了背后的理论。
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引用次数: 1
Synchronization of Chaotic Systems via Active Disturbance Rejection Control 混沌系统的自抗扰同步控制
Pub Date : 2017-04-12 DOI: 10.4236/ICA.2017.82007
F. A. Khadra
This paper presents the use of active disturbance rejection control method (ADRC) to synchronize two different chaotic systems. The master system and slave systems have uncertainties and external disturbances. The numerical results are presented for the synchronization between the Duffing-Holmes system and the van der pol system. The numerical results presented show the effectiveness of the proposed method.
本文提出了用自抗扰控制方法来同步两个不同的混沌系统。主系统和从系统具有不确定性和外部干扰。给出了Duffing-Holmes系统和van der pol系统同步的数值结果。数值结果表明了该方法的有效性。
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引用次数: 2
Discretization of Fractional Order Differentiator and Integrator with Different Fractional Orders 分数阶微分和不同分数阶积分器的离散化
Pub Date : 2017-04-12 DOI: 10.4236/ICA.2017.82006
Qi Zhang, Baoye Song, Huadong Zhao, Jiansheng Zhang
This paper is concerned with the discretization of the fractional-order differentiator and integrator, which is the foundation of the digital realization of fractional order controller. Firstly, the parameterized Al-Alaoui transform is presented as a general generating function with one variable parameter, which can be adjusted to obtain the commonly used generating functions (e.g. Euler operator, Tustin operator and Al-Alaoui operator). However, the following simulation results show that the optimal variable parameters are different for different fractional orders. Then the weighted square integral index about the magtitude and phase is defined as the objective functions to achieve the optimal variable parameter for different fractional orders. Finally, the simulation results demonstrate that there are great differences on the optimal variable parameter for differential and integral operators with different fractional orders, which should be attracting more attentions in the design of digital fractional order controller.
本文研究了分数阶微分和积分器的离散化问题,这是分数阶控制器数字化实现的基础。首先,将参数化的Al-Alaoui变换表示为具有一个可变参数的一般生成函数,该生成函数可以通过调整得到常用的生成函数(如Euler算子、Tustin算子和Al-Alaoui算子)。然而,下面的仿真结果表明,对于不同分数阶,最优变量参数是不同的。在此基础上,定义了量值和相位的加权平方积分指标作为目标函数,以实现不同分数阶的最优变量参数。最后,仿真结果表明,不同分数阶的微分算子和积分算子在最优变量参数上存在很大差异,这在数字分数阶控制器的设计中应引起重视。
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引用次数: 5
Characteristics of a Transactive Phenomenon in Relationships among Older Adults with Dementia, Nurses as Intermediaries, and Communication Robot 老年痴呆患者、护士作为中介和通信机器人之间关系的交互现象特征
Pub Date : 2017-04-12 DOI: 10.4236/ICA.2017.82009
K. Osaka, H. Sugimoto, T. Tanioka, Yuko Yasuhara, R. Locsin, Yueren Zhao, Kikuko Okuda, Ken Saito
Healthcare for older adults with dementia is an important healthcare problem in Japan and in other developed countries. Importantly, healthcare workers in Japan are also getting older. In order to address solutions to this problem, using robots is being realized and is starting to assist healthcare and welfare practice needs. The aim of this study was to identify the characteristics of a transactive phenomenon in relationships among older adults with dementia, with nurses as intermediaries and with a cognitive skill-aid robot. Subjects were two institutionalized older adults who were diagnosed with dementia using Hasegawa’s Dementia Scale-Revised; a Kabochan (Nodding Kabochan) fixed with a remote-controlled speaker, Pechat (Kabochan with Pechat). Measurements of autonomic nervous activity were done using wearable electrocardiography attached to the subjects for four hours. Heart Rate Variability data were assessed at various frequency bands using a HRV software tool. In a continuously recorded data, interbeat (R-R) intervals were obtained for a 1-min segment using the maximum entropy method. In this study, the two major spectral components of HRV, the variances of the low-frequency (LF: 0.04 - 0.15 Hz) band and high-frequency (HF: 0.15 - 0.4 Hz) band, were calculated. Activities and behaviors of subjects transacting with Kabochan were observed by the expert nurses and video-recorded. Throughout the transaction period, observations were recorded of patients’ behavior, words uttered and over-all contents of the transactive conversation with the Kabochan or Kabochan with Pechat. Identified characteristics were transactive relationship phenomenon; changes in autonomic nervous system activity of persons with dementia are expressed as per one minute, linguistic response of elderly people, transactive relations among Kabochan, Kabochan with Pechat, and nurses as intermediaries. These were exhibited as Figures: Situation 1, A Sense of Fear, Situation 2, A Pleasant Sensation, and Situation 3, Misunderstanding and Confusion. It also showed that autonomic nervous system activity of persons with communication skills is actively changing in older adults with dementia. Conversation of adding Pechat to the Kabochan illustrated that nurses as intermediaries showed emotional conversations as established by effectively manipulating the Pechat. Also, it was revealed that if Kabochan with Pechat uttered words about patient’s personal information in a conversation, the patient felt a sense of fear. The researchers suggest that when developing future communication robot for elderly with dementia, it is necessary to consider, for an effective conversation, transactive relationships including nurses as intermediaries. The role functions of these intermediaries have been shown of high versatility, indicating that situations such as these can also be controlled by other healthcare providers such as by occupational therapists.
在日本和其他发达国家,老年痴呆症患者的医疗保健是一个重要的医疗保健问题。重要的是,日本的医疗工作者也在变老。为了解决这个问题,使用机器人正在实现,并开始协助医疗保健和福利实践的需求。这项研究的目的是确定老年痴呆症患者之间的互动现象的特征,护士作为中介,与认知技能辅助机器人。研究对象为两名住院的老年人,他们使用Hasegawa 's痴呆量表-修订版诊断为痴呆;一个Kabochan(点头Kabochan),固定一个遥控扬声器,Pechat(带Pechat的Kabochan)。自主神经活动的测量是通过穿戴式心电图仪在受试者身上固定4小时完成的。使用心率变异性软件工具在不同频段评估心率变异性数据。在连续记录的数据中,使用最大熵法获得1 min段的拍间(R-R)间隔。在本研究中,计算了HRV的两个主要频谱成分,低频(LF: 0.04 - 0.15 Hz)和高频(HF: 0.15 - 0.4 Hz)波段的方差。由护理专家对被试使用Kabochan的活动和行为进行观察和录像。在整个交易期间,记录患者与Kabochan或Kabochan与Pechat的互动对话的行为、所说的话和总体内容。识别特征为交互关系现象;痴呆患者自主神经系统活动的变化以每分钟表示,老年人的语言反应,Kabochan之间的互动关系,Kabochan与Pechat之间的互动关系,护士作为中介。这些被展示为图形:情况1,恐惧的感觉,情况2,愉快的感觉,情况3,误解和困惑。研究还表明,有沟通能力的人的自主神经系统活动在老年痴呆症患者中发生了积极的变化。将Pechat添加到Kabochan的对话表明,护士作为中介显示了通过有效操纵Pechat建立的情感对话。此外,据调查,如果Kabochan和Pechat在谈话中说出有关患者个人信息的话,患者会感到恐惧。研究人员建议,在开发未来的痴呆症老年人交流机器人时,为了有效的对话,有必要考虑以护士为中介的互动关系。这些中介的角色功能已经显示出高度的多功能性,表明诸如此类的情况也可以由其他医疗保健提供者(如职业治疗师)控制。
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引用次数: 22
Method of Dynamic VaR and CVaR Risk Measures Forecasting for Long Range Dependent Time Series on the Base of the Heteroscedastic Model 基于异方差模型的长期依赖时间序列动态VaR和CVaR风险测度预测方法
Pub Date : 2017-04-12 DOI: 10.4236/ICA.2017.82010
N. Pankratova, Nataliia G. Zrazhevska
The paper proposes a new method of dynamic VaR and CVaR risk measures forecasting. The method is designed for obtaining the forecast estimates of risk measures for volatile time series with long range dependence. The method is based on the heteroskedastic time series model. The FIGARCH model is used for volatility modeling and forecasting. The model is reduced to the AR model of infinite order. The reduced system of Yule-Walker equations is solved to find the autoregression coefficients. The regression equation for the autocorrelation function based on the definition of a long-range dependence is used to get the autocorrelation estimates. An optimization procedure is proposed to specify the estimates of autocorrelation coefficients. The procedure for obtaining of the forecast values of dynamic risk measures VaR and CVaR is formalized as a multi-step algorithm. The algorithm includes the following steps: autoregression forecasting, innovation highlighting, obtaining of the assessments for static risk measures for residuals of the model, forming of the final forecast using the proposed formulas, quality analysis of the results. The proposed method is applied to the time series of the index of the Tokyo stock exchange. The quality analysis using various tests is conducted and confirmed the high quality of the obtained estimates.
本文提出了一种新的动态VaR和CVaR风险度量预测方法。该方法是为获得具有长程依赖性的波动时间序列的风险测度的预测估计而设计的。该方法基于异方差时间序列模型。FIGARCH模型用于波动率建模和预测。将该模型简化为无限阶的AR模型。对Yule-Worker方程的简化系统进行求解,得到自回归系数。使用基于长程依赖性定义的自相关函数的回归方程来获得自相关估计。提出了一种优化程序来指定自相关系数的估计。获得动态风险度量VaR和CVaR的预测值的过程被形式化为一个多步骤算法。该算法包括以下步骤:自回归预测、创新突出、获得模型残差的静态风险度量评估、使用所提出的公式形成最终预测、结果的质量分析。将该方法应用于东京证券交易所指数的时间序列。使用各种测试进行了质量分析,并证实了所获得的估计的高质量。
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引用次数: 3
Temperature Calculation of Pellet Rotary Kiln Based on Texture 基于纹理的球团回转窑温度计算
Pub Date : 2017-04-12 DOI: 10.4236/ICA.2017.82005
Chunli Lin, Yufan Wu
In order to improve the quality of clinker produced by pellet rotary kiln, flame temperature that it is a very important factor of affecting on the quality of clinker is studied. The flame images collected from pellet rotary kiln are decomposed into three gray images by the method of RGB, so we can get more information of flame. Taking advantage of gray level co-occurrence matrix, the monitoring model for flame temperature based on image texture is established with RGB channels. In order to test the universality of the algorithm, candle flame temperature is detected by this method. The maximum error of the model is less than 3%.
为了提高球团回转窑生产熟料的质量,对影响熟料质量的一个重要因素——火焰温度进行了研究。采用RGB方法将球团回转窑火焰图像分解为三幅灰度图像,从而获得更多的火焰信息。利用灰度共生矩阵,利用RGB通道建立了基于图像纹理的火焰温度监测模型。为了检验算法的通用性,采用该方法对蜡烛火焰温度进行了检测。该模型的最大误差小于3%。
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引用次数: 0
Recommended Design and Direction of Development for Humanoid Nursing Robots Perspective from Nursing Researchers 从护理研究者的角度看仿人护理机器人推荐设计与发展方向
Pub Date : 2017-04-12 DOI: 10.4236/ICA.2017.82008
T. Tanioka, K. Osaka, R. Locsin, Yuko Yasuhara, Hirokazu Ito
The purpose of this article is to describe recommendations towards the design and direction of development for Humanoid Nursing Robots (HNRs) from the standpoint of researchers of nursing care practice. Efforts to introduce robot technologies in nursing practice and to use them in elderly and high-tech healthcare environments have begun in developed countries like Japan. Companies are developing various types of robots, although their types and functionalities continue to require a clear identification and definition. Regardless, robot developments for health care purposes are progressing well to meet universal technological demands. While human caring has been a human-to-human relationship, in a nonhuman-to-human relationship in the case of HNRs, it is essential to consider ethical concerns and human safety. If HNRs are to support patients directly, they must be required to have the same level of comprehensive judgment ability and responsiveness as that of human nurses. This includes abilities to genuinely observe, judge, rapidly respond, and conduct human caring practice emphasizing individuality. If HNRs support patients independently, abilities which are much like those of humans will be required of them in addition to the appropriate intelligence and skillfulness to do so. A low level robot nurse exerts work that should be called non-nursing or as a medical aid assistant no matter who thinks and what these technologies can do. Similarly, a higher level HNR with higher level artificial intelligence is expected to exceed the capabilities of human beings. As such, current discourse and debate also include the concern that HNRs may now become one’s superior or rather that the HNR is a subordinate thereby requiring human management.
本文的目的是从护理实践研究人员的角度描述对人形护理机器人(hnr)的设计和发展方向的建议。在日本等发达国家,已经开始在护理实践中引入机器人技术,并在老年人和高科技医疗环境中使用机器人技术。公司正在开发各种类型的机器人,尽管它们的类型和功能仍然需要明确的识别和定义。无论如何,用于医疗保健目的的机器人发展进展良好,以满足普遍的技术需求。虽然人类关怀一直是人与人之间的关系,但在hnr的情况下,在非人与人之间的关系中,必须考虑伦理问题和人类安全。如果hnr要直接支持患者,就必须要求他们具有与人类护士相同的综合判断能力和反应能力。这包括真正的观察、判断、快速反应和进行强调个性的人类关怀实践的能力。如果hnr能够独立地支持病人,那么除了适当的智力和技巧之外,他们还需要具备类似人类的能力。一个低级别的机器人护士所做的工作应该被称为非护理或医疗辅助助理,不管这些技术能做什么,也不管谁想。同样,更高层次的HNR和更高层次的人工智能也有望超越人类的能力。因此,当前的话语和辩论也包括这样的关注,即HNR现在可能成为一个人的上级,或者更确切地说,HNR是一个下属,因此需要人力管理。
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引用次数: 36
Cognitive Supervisor for an Autonomous Swarm of Robots 自主机器人群的认知管理
Pub Date : 2017-02-24 DOI: 10.4236/ICA.2017.81004
V. Ivancevic, D. Reid
As a sequel to our recent work [1], in which a control framework was developed for large-scale joint swarms of unmanned ground (UGV) and aerial (UAV) vehicles, the present paper proposes cognitive and meta-cognitive supervisor models for this kind of distributed robotic system. The cognitive supervisor model is a formalization of the recently Nobel-awarded research in brain science on mammalian and human path integration and navigation, performed by the hippocampus. This is formalized here as an adaptive Hamiltonian path integral, and efficiently simulated for implementation on robotic vehicles as a pair of coupled nonlinear Schrodinger equations. The meta-cognitive supervisor model is a modal logic of actions and plans that hinges on a weak causality relation that specifies when atoms may change their values without specifying that they must change. This relatively simple logic is decidable yet sufficiently expressive to support the level of inference needed in our application. The atoms and action primitives of the logic framework also provide a straight-forward way of connecting the meta-cognitive supervisor with the cognitive supervisor, with other modules, and to the meta-cognitive supervisors of other robotic platforms in the swarm.
作为我们最近的工作[1]的续集,在[1]中,我们为无人地面(UGV)和无人空中(UAV)车辆的大规模联合群开发了控制框架,本文提出了这种分布式机器人系统的认知和元认知监督模型。认知监督模型是最近获得诺贝尔奖的关于哺乳动物和人类路径整合和导航的脑科学研究的形式化,该研究由海马体完成。本文将其形式化为自适应哈密顿路径积分,并将其作为一对耦合的非线性薛定谔方程有效地模拟在机器人车辆上的实现。元认知监督模型是行动和计划的模态逻辑,它依赖于一个弱因果关系,它指定原子何时可以改变它们的值,而不指定它们必须改变。这个相对简单的逻辑是可确定的,但足够表达,可以支持我们应用程序中所需的推理级别。逻辑框架的原子和动作原语还提供了一种直接的方式,将元认知管理器与认知管理器、其他模块以及群中其他机器人平台的元认知管理器连接起来。
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引用次数: 2
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智能控制与自动化(英文)
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