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Two-level priority scheduling framework in a max-plus linear representation 一种最大+线性表示的两级优先级调度框架
Pub Date : 2021-04-01 DOI: 10.1080/18824889.2021.1894886
Kyohei Sagawa, Y. Shimakawa, H. Goto
ABSTRACT A common type of scheduling policy includes first-in-first-out (FIFO) and earliest-outset bases. Among many approaches to this, max-plus linear representation is beneficial for event-driven discrete event systems (DESs). The earliest event occurrence times can be represented by linear relations in max-plus algebra, the resultant of which is analogous with the state equation in modern control theory. Methodologies in control theory such as evolution prediction and just-in-time scheduling can thus be utilized. Although useful, the description capability remains confined to FIFO contexts, for which the method would not be capable of producing an efficient solution for systems with two-level priorities. An entity, e.g. a task or token in scheduling contexts, with higher qualification would be prioritized over one with a lower qualification. A framework for overtaking tasks is necessary for this. Motivated by this need, this article is concerned with constructing a two-level priority scheduling methodology in a max-plus linear context. A numerical experiment applied to a simple manufacturing system highlights the significance of the constructed method.
一种常见的调度策略包括先进先出(FIFO)和最早开始的调度策略。在许多方法中,最大+线性表示有利于事件驱动的离散事件系统(DESs)。最早事件发生时间可以用max-plus代数中的线性关系表示,其结果与现代控制理论中的状态方程类似。因此,控制理论中的方法,如进化预测和准时调度可以被利用。虽然有用,但描述能力仍然局限于FIFO上下文,因此该方法无法为具有两级优先级的系统产生有效的解决方案。具有较高资格的实体,例如调度上下文中的任务或令牌,将优先于具有较低资格的实体。为此,超车任务的框架是必要的。基于这一需求,本文研究了在最大+线性环境下构建两级优先级调度方法。一个简单制造系统的数值实验表明了所构建方法的意义。
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引用次数: 0
Deep convolutional long short-term memory for forecasting wind speed and direction 用于预测风速和风向的深度卷积长短期记忆
Pub Date : 2021-03-19 DOI: 10.1080/18824889.2021.1894878
Anggraini Puspita Sari, Hiroshi Suzuki, T. Kitajima, T. Yasuno, Dwi Arman Prasetya, Abd. Rabi'
This paper proposed deep learning to create an accurate forecasting system that uses a deep convolutional long short-term memory (DCLSTM) for forecasting wind speed and direction. In order to use the DCLSTM system, wind speed and direction are represented as an image in 2D coordinates and make it to time sequence data. The wind speed and direction data were obtained from AMeDAS (Automated Meteorological Data Acquisition System), Japan. The target of the proposed forecasting system was to improve forecasting accuracy compared to the system in SICE 2020 (The Society of Instrument and Control Engineers Annual Conference 2020) in all seasons. For verifying the efficiency of the forecasting system by comparison with persistent system, deep fully connected-LSTM (DFC-LSTM) and encoding-forecasting network with convolutional long short-term memory (CLSTM) systems were investigated. Forecasting performance of the system was evaluated by RMSE (root mean square error) between forecasted and measured data.
本文提出了深度学习来创建一个精确的预测系统,该系统使用深度卷积长短期记忆(DCLSTM)来预测风速和风向。为了使用DCLSTM系统,将风速和风向表示为二维坐标图像,并将其转化为时间序列数据。风速和风向数据来自日本AMeDAS(自动气象数据采集系统)。所提出的预测系统的目标是在所有季节与SICE 2020(仪器与控制工程师学会2020年年会)的系统相比,提高预测精度。为了验证预测系统与持久系统的有效性,研究了深度全连接lstm (DFC-LSTM)和带有卷积长短期记忆(CLSTM)的编码预测网络系统。通过预测数据与实测数据的均方根误差(RMSE)对系统的预测性能进行评价。
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引用次数: 6
Safe-update of bi-layered controller and its application to power systems 双层控制器的安全更新及其在电力系统中的应用
Pub Date : 2021-03-19 DOI: 10.1080/18824889.2021.1894899
Toshiki Homma, M. Inoue, J. Imura, Kengo Urata
In real-world social infrastructures such as power systems, proven controllers are already implemented and operated stably. To further improve the control performance reliably, bi-layered control with inheriting the existing controller is proposed: the existing controller generates the baseline control signal in the upper layer, while multiple sub-controllers individually coordinate the signal to actuate the infrastructure system in the lower layer. The sub-controllers are characterized by few parameters that represent the degree of coordination. Then, the update strategy of the parameter with guaranteeing the safety of the overall system is proposed. The effectiveness of the bi-layered control is shown via a numerical experiment with a power system model.
在现实世界的社会基础设施中,如电力系统,经过验证的控制器已经实现并稳定运行。为了进一步可靠地提高控制性能,提出了继承现有控制器的双层控制:现有控制器在上层产生基线控制信号,而多个子控制器分别协调信号以驱动下层基础系统。子控制器的特点是用很少的参数来表示协调程度。然后,在保证系统整体安全的前提下,提出了参数更新策略。通过一个电力系统模型的数值实验,验证了双层控制的有效性。
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引用次数: 0
Introduce structural equation modelling to machine learning problems for building an explainable and persuasive model 将结构方程建模引入机器学习问题,以建立一个可解释和有说服力的模型
Pub Date : 2021-03-19 DOI: 10.1080/18824889.2021.1894040
Jiarui Li, T. Sawaragi, Y. Horiguchi
With the development of artificial intelligence technologies, the high accuracy of machine learning methods has become a non-unique standard. People are beginning to be more concerned about the understandability between humans and machines. The interference procedure of the machines is hoped to accord with human thinking as much as possible, which has spawned the recent and ongoing demands for developing explainable models. The present study proposes a new explainable and persuasive model for machine learning problems by introducing Structural Equation Modelling into the picture. Six parts make up the model, from data collection to model evaluation. The model can be used for data analysis, machine learning, and causal analysis. The proposed model is also transparent and can be interpreted from design to application. A practical experiment shows its effectiveness in a healthcare problem.
随着人工智能技术的发展,机器学习方法的高精度已经成为一个非唯一的标准。人们开始更加关注人与机器之间的可理解性。人们希望机器的干扰过程尽可能符合人类的思维,这催生了近期和持续发展的可解释模型的需求。本研究通过引入结构方程模型,为机器学习问题提出了一个新的可解释和有说服力的模型。从数据收集到模型评价,共分为六个部分。该模型可用于数据分析、机器学习和因果分析。所提出的模型也是透明的,并且可以从设计到应用进行解释。一个实际的实验证明了它在医疗保健问题上的有效性。
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引用次数: 8
Influence of road environmental elements on pedestrian and cyclist road crossing behaviour 道路环境因素对行人和骑自行车者过马路行为的影响
Pub Date : 2021-03-19 DOI: 10.1080/18824889.2021.1894900
Yuichi Saito, Fuma Kochi, M. Itoh, T. Fushima, Takashi Sugano, Yasunori Yamamoto
The pedestrian and cyclist-related accident fatality rate is higher than that of other traffic accidents. One of the pedestrian behaviours that leads to traffic accidents is the act of moving rapidly onto the road from a blind spot without warning. Expert drivers practice hazard-anticipatory driving and will naturally seek to reduce uncertainty by attempting to fit their current driving context into a pre-existing category. Risk management is the process of identifying hazards and assessing and controlling risks to attain safety. The purpose of this study was to evaluate the influence that driving context-altering road environmental elements exert on the road-crossing behaviour of pedestrians and cyclists. Thus, this study attempted to identify covert hazards (obscured pedestrians and cyclists). A logistic regression analysis was employed along with data from the near-miss incident database, in which approximately 140,000 near-crash-relevant events were registered in 2017. By using the logistic regression analysis along with the annotations recorded in the database, we constructed a predictive model to identify covert hazards. The study demonstrated the feasibility of using a set of environmental elements that shape the driving context to construct a predictive model that identifies covert hazards.
与行人和骑自行车相关的交通事故死亡率高于其他交通事故。导致交通事故的行人行为之一是在没有警告的情况下从盲点迅速移动到道路上。经验丰富的司机会进行危险预估驾驶,自然会通过尝试将当前的驾驶环境与预先存在的类别相匹配来减少不确定性。风险管理是识别危害、评估和控制风险以达到安全的过程。本研究的目的是评估驾驶情境改变的道路环境因素对行人和骑自行车者过马路行为的影响。因此,本研究试图识别隐蔽的危险(被遮挡的行人和骑自行车的人)。该研究采用了逻辑回归分析以及来自未遂事故数据库的数据,该数据库在2017年记录了大约14万起与未遂事故相关的事件。通过逻辑回归分析以及数据库中记录的注释,我们构建了一个预测模型来识别隐蔽危险。该研究证明了使用一组影响驾驶环境的环境因素来构建识别隐蔽危险的预测模型的可行性。
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引用次数: 1
Locally deforming continuation method based on a shooting method for a class of optimal control problems 一类最优控制问题的基于射击法的局部变形延拓方法
Pub Date : 2021-03-18 DOI: 10.1080/18824889.2021.1893936
Kiyoshi Hamada, I. Maruta, K. Fujimoto, K. Hamamoto
ABSTRACT This paper proposes a new continuation method for solving optimal control problems. The proposed method is based on a shooting method. In the proposed method, a cost function of an optimal control problem is locally deformed to find the solution of the problem in a stable way. This paper also analyses a relationship between the variation of the continuation parameter and the proximity of the solutions before and after a deformation in the proposed method. The obtained relation provides guidance on how to deform the continuation parameter. The effectiveness of this method is confirmed through numerical examples.
提出了求解最优控制问题的一种新的延拓方法。提出的方法是基于一种射击方法。该方法对最优控制问题的代价函数进行局部变形,以求得最优控制问题的稳定解。本文还分析了该方法中延拓参数的变化与变形前后解的接近度之间的关系。得到的关系对如何变形连续参数具有指导意义。通过数值算例验证了该方法的有效性。
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引用次数: 5
Intention estimation and controllable behaviour models for traffic merges 交通合并的意图估计与可控行为模型
Pub Date : 2021-03-18 DOI: 10.1080/18824889.2021.1894001
A. Mahajan, Takayasu Kumano, Y. Yasui
This work focuses on decision making for automated driving vehicles in interaction rich scenarios like traffic merges in a flexibly assertive yet safe manner. We propose a Q-learning based approach, that takes in active intention inferences as additional inputs besides the directly observed state inputs. The outputs of Q-function are processed to select a decision by a modulation function, which can control how assertively or defensively the agent behaves.
这项工作的重点是自动驾驶车辆在交通合并等交互丰富的场景下以灵活自信而安全的方式做出决策。我们提出了一种基于q学习的方法,该方法将主动意图推断作为直接观察状态输入之外的额外输入。通过调制函数处理q函数的输出以选择决策,调制函数可以控制代理的行为是自信的还是防御的。
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引用次数: 0
Adaptive multi-modal interface model concerning mental workload in take-over request during semi-autonomous driving 半自动驾驶接管请求心理负荷的自适应多模态接口模型
Pub Date : 2021-03-11 DOI: 10.1080/18824889.2021.1894023
Weiya Chen, T. Sawaragi, T. Hiraoka
With the development of automated driving technologies, human factors involved in automated driving are gaining increasing attention for a balanced implementation of the convenience brought by the technology and safety risk in commercial vehicle models. One influential human factor is mental workload. In the take-over request (TOR) from autonomous to manual driving at level 3 of International Society of Automotive Engineers' (SAE) Levels of Driving Automation, the time window for the driver to have full comprehension of the driving environment is extremely short, which means the driver is under high mental workload. To support the driver during a TOR, we propose an adaptive multi-modal interface model concerning mental workload. In this study, we evaluated the reliability of only part of the proposed model in a driving-simulator experiment as well as using the experimental data from a previous study.
随着自动驾驶技术的发展,为了在商用车车型中平衡实现技术带来的便利性和安全风险,自动驾驶中涉及的人为因素越来越受到关注。一个有影响的人为因素是精神负荷。在国际汽车工程师学会(SAE)自动驾驶水平3级从自动驾驶到手动驾驶的接管请求(TOR)中,驾驶员充分了解驾驶环境的时间窗口非常短,这意味着驾驶员承受着很高的精神负荷。为了在TOR过程中支持驾驶员,我们提出了一个考虑心智负荷的自适应多模态接口模型。在本研究中,我们仅在驾驶模拟器实验中评估了所提出模型的部分可靠性,并使用了先前研究的实验数据。
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引用次数: 5
Connectivity maintenance with application to target search 从应用程序到目标搜索的连接性维护
Pub Date : 2021-03-11 DOI: 10.1080/18824889.2021.1893971
Hiroaki Kata, S. Ueno
ABSTRACT Connectivity maintenance with application to target search considering the failure of unmanned vehicles is proposed. The unmanned vehicles form a network and exchange information with neighbours. Vehicle failures can cause network disconnection and disruption of information exchange. Therefore, the robust k-connected network, which the network is connected even if less than k unmanned vehicles fail, is configured in a decentralized system. Each vehicle determines the velocity input according to the partial vertex connectivity, which is an evaluation of connectivity for each vehicle, and triangulation input for collision avoidance. Target search simulation in the presence of obstacles shows that the proposed robust k-connected network control law is valid.
提出了一种考虑无人驾驶车辆故障的连接维护方法,并将其应用于目标搜索。无人驾驶车辆形成一个网络,并与邻居交换信息。车辆故障可能导致网络中断和信息交换中断。因此,在去中心化系统中配置鲁棒k连接网络,即在少于k辆无人车故障的情况下,网络仍保持连接。每辆车根据部分顶点连通性来确定速度输入,这是对每辆车的连通性的评估,以及避免碰撞的三角化输入。存在障碍物的目标搜索仿真结果表明,所提出的鲁棒k连接网络控制律是有效的。
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引用次数: 2
Predicting the bladder urinary volume with a reabsorbed primitive urine model 用原始尿重吸收模型预测膀胱尿量
Pub Date : 2021-02-22 DOI: 10.1080/18824889.2021.1874679
H. Taku, Hamada Yuri, Kaburagi Takashi, Kurihara Yosuke
With the rapid aging of the population, urination management is one of the challenges experienced in nursing homes. Although constrained devices, such as ultrasonic sensors, have been used for urination management, and they can sequentially measure urinary volume in the bladder, unconstrained methods to obtain urinary volume are needed. To accomplish such goals, a mathematical model is required that considers the nature of the bladder, especially reabsorption of the primitive urine. In this paper, we propose a model based on the primary delay system with five parameters, which are determined based on the absorption spectrum of urine that is obtained immediately after urination, through regression analysis. In the regression analysis, the values of the five parameters and the absorption spectrum of urine are objective and explanatory variables, respectively, and the partial regression coefficients are determined through a genetic algorithm. When the values of the five parameters are estimated using the absorption spectrum of urine immediately after urination, we can predict the next time series of the urinary volume in the bladder based on the model. Finally, the predicted urinary volume is corrected using a multitask Gaussian process and the final predicted urinary volume is obtained. We performed a series of experiments to evaluate the proposed method and calculated the error rate between the actual urinary volume and the urinary volume predicted using the proposed method at the time of urination. The mean error rate of the proposed method is 13.32%.
随着人口的快速老龄化,排尿管理是养老院面临的挑战之一。虽然约束装置,如超声传感器,已用于排尿管理,它们可以连续测量膀胱内的尿量,但需要无约束的方法来获得尿量。为了实现这一目标,需要一个数学模型来考虑膀胱的性质,特别是原始尿液的重吸收。在本文中,我们提出了一个基于初级延迟系统的模型,该模型具有五个参数,这些参数是根据尿液在排尿后立即获得的尿液吸收光谱,通过回归分析确定的。在回归分析中,5个参数值和尿液吸收光谱值分别为客观变量和解释变量,通过遗传算法确定偏回归系数。当我们利用排尿后尿液的吸收光谱来估计这五个参数的值时,我们可以根据模型预测膀胱内尿量的下一个时间序列。最后,使用多任务高斯过程对预测的尿量进行校正,得到最终的预测尿量。我们进行了一系列实验来评估所提出的方法,并计算了实际尿量与使用所提出的方法预测的排尿量之间的错误率。该方法的平均错误率为13.32%。
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引用次数: 1
期刊
SICE journal of control, measurement, and system integration
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