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Context-Aware Dynamic Object Relationship Modeling 上下文感知的动态对象关系建模
Pub Date : 2022-05-01 DOI: 10.7763/ijmo.2022.v12.798
Kentaroh Toyoda, Rachel Gan Kai Ying, Tan Puay Siew, Allan Neng Sheng Zhang
Finding relationships in the data is essential for object modeling. However, existing methods generally focus on pre-defined static relationships using semantics and ontology, which is inappropriate when we are interested in dynamic relationships between objects that appear in data sources (e.g. log files). In this paper, we propose two novel methods to dynamically extract contextual relationships that appear in heterogeneous data sources. Our method detects contexts (e.g. time and location) in a given data source and quantifies the similarities between objects based on the detected contexts. Specifically, our methods consist of (i) a fast and accurate context detection method with carefully engineered discriminative features and (ii) a similarity measure that takes into account contexts. We evaluated our context detection method with an open dataset to show its detection accuracy and speed.
寻找数据中的关系对于对象建模至关重要。然而,现有的方法通常关注使用语义和本体的预定义静态关系,当我们对数据源(如日志文件)中出现的对象之间的动态关系感兴趣时,这是不合适的。在本文中,我们提出了两种新的方法来动态提取出现在异构数据源中的上下文关系。我们的方法检测给定数据源中的上下文(例如时间和位置),并基于检测到的上下文量化对象之间的相似性。具体来说,我们的方法包括(i)一种具有精心设计的判别特征的快速准确的上下文检测方法和(ii)考虑上下文的相似性度量。我们用一个开放的数据集来评估我们的上下文检测方法,以显示其检测的准确性和速度。
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引用次数: 0
Optimal Base Station Network Based on Topological Data Analysis 基于拓扑数据分析的基站网络优化
Pub Date : 2022-02-01 DOI: 10.7763/ijmo.2022.v12.792
Min Lyu
The decision of which base stations need to be removed due to the cost is always a difficult problem, because the influence on the cover rate of the network caused by the removal should be kept to a minimum. However, the common methods to solve this problem such as K-means Clustering show a low accuracy. Barcode, which belongs to TDA, has the possibility to show the result by identifying the Persistent Homology of base station network. This essay mainly illustrates the specific problem of optimal base station network, which applies the TDA(Topological Data Analysis) methods to find which base stations need removing due to the cost K-means Clustering and Topological Data Analysis methods were mainly used. With the simulated distribution of telecommunication users, K-means Clustering algorithm was used to locate 30 best base stations. By comparing the minimum distance between the results (K=25 and K=30), K-means Clustering was used again to decide base station points to be removed. Then TDA was used to select which 5 base stations should be removed through observing barcode. By repeating above steps five times, Finally the average and variance of cover area in original network, K-means Clustering and TDA were compared. The experiment showed that the average cover rate of original network was 81.20% while the result of TDA and K-means Clustering were 92.13% and 89.87%. It was proved by simulation that it is more efficient to use TDA methods to construct the optimal base station network.
由于成本的原因,决定哪些基站需要拆除一直是一个难题,因为拆除对网络覆盖率的影响应该保持在最低限度。然而,解决这一问题的常用方法,如K-means聚类,准确率较低。条形码属于TDA,可以通过识别基站网络的持久同源性来显示结果。本文主要阐述了优化基站网络的具体问题,运用TDA(Topological Data Analysis,拓扑数据分析)方法来发现哪些基站由于成本而需要移除,主要使用k均值聚类和拓扑数据分析方法。在模拟电信用户分布的基础上,采用K-means聚类算法对30个最佳基站进行定位。通过比较结果之间的最小距离(K=25和K=30),再次使用K-means聚类来确定要去除的基站点。然后通过观察条形码,采用TDA法选择需要移除的5个基站。重复上述步骤5次,最后比较原始网络覆盖面积、K-means聚类和TDA的平均值和方差。实验表明,原始网络的平均覆盖率为81.20%,而TDA聚类和K-means聚类的结果分别为92.13%和89.87%。仿真结果表明,采用TDA方法构建最优基站网络效率更高。
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引用次数: 0
CFD-CAA Method for Prediction of Pseudosound and Emitted Noise in Quadcopter Propeller 四轴飞行器螺旋桨伪声和发射噪声的CFD-CAA预测方法
Pub Date : 2022-02-01 DOI: 10.7763/ijmo.2022.v12.794
S. Timushev, A. Yakovlev, D. Klimenko
Subsonic flow air blade machines like UAV propellers generate intensive noise thus the prediction of acoustic impact, optimization of these machines in order to reduce the level of emitted noise is an urgent engineering task. Currently, the development of calculation methods for determining the amplitudes of pressure pulsations and noise characteristics by CFD-CAA methods is a necessary requirement for the development of computer-aided design methods for blade machines, where the determining factors are the accuracy and speed of calculations. The main objective is to provide industrial computer-aided design systems with a highly efficient domestic software to create optimal designs of UAV blade machines that provide a given level of pressure pulsations in the flow part and radiated noise. It comprises: 1) creation of a method for the numerical simulation of sound generation using the correct decomposition of the initial equations of hydrodynamics of a compressible medium and the selection of the source of sound waves in a three-dimensional definition, taking into account the rotation of blades and their interaction with the stator part of the UAV; 2) decomposition of the boundary conditions accounting pseudo-sound disturbances and the complex acoustic impedance at the boundaries of the computational domain 3) development of an effective SLAE solver for solving the acoustic-vortex equation in complex arithmetic (taking into account the boundary conditions in the form of complex acoustic impedance); 4) testing of a new method at all stages of development using experimental data on the generation of pressure pulsations and aerodynamic noise, including a propeller noise measurements.
像无人机螺旋桨这样的亚音速气流叶片机械产生强烈的噪声,因此声冲击预测、优化这些机械以降低噪声水平是一项紧迫的工程任务。目前,发展利用CFD-CAA方法确定压力脉动幅值和噪声特性的计算方法是发展叶片机械计算机辅助设计方法的必然要求,其中决定因素是计算的准确性和速度。主要目标是为工业计算机辅助设计系统提供一个高效的国内软件,以创建UAV叶片机器的最佳设计,在流动部分提供给定水平的压力脉动和辐射噪声。它包括:1)考虑到叶片的旋转及其与无人机定子部分的相互作用,利用可压缩介质流体动力学初始方程的正确分解和三维定义中声源的选择,创建一种声音生成的数值模拟方法;2)分解了计算域边界处考虑伪声扰动和复声阻抗的边界条件;3)开发了一种有效的求解复杂算法声涡方程的SLAE求解器(考虑复声阻抗形式的边界条件);4)利用压力脉动和气动噪声产生的实验数据,包括螺旋桨噪声测量,在开发的各个阶段测试一种新方法。
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引用次数: 0
Sealing The Cracks in the Wear Layer of the Road Surface by Friction against a Rotary Active Element 通过与旋转主动元件的摩擦密封路面磨损层的裂缝
Pub Date : 2022-02-01 DOI: 10.7763/ijmo.2022.v12.795
Ş. Ioniţă, Ș. Velicu
The main objective of the research paper is the theoretical and experimental analysis of the method proposed for sealing (clogging) cracks in asphalt, by means of a cylindrical bitumen bar, enriched with plastic and rubber granules (obtained from the use of waste), which melts and infuses into the cracked zone by rotation and friction against it. After analyzing the technical characteristics of the sealed area and the time required to apply the bitumen layer, this method can be chosen in the future to the detriment of the expensive operations of partial milling of the cracked wear layer, making possible the repair of cracks by sealing(clogging), using the friction procedure. The research results highlighted the diminution of road maintenance costs using the method of friction, the decrease of cracks repair time, maintaining the initial characteristics of the repaired area, incorporating a waterproofing material (plastic and rubbber granules from recycled waste), keeping the wear layer in good conditions, possibility of embedding an intelligent system of traffic monitoring at low costs etc.
本研究论文的主要目的是对提出的封堵(堵塞)沥青裂缝的方法进行理论和实验分析,该方法是采用一种圆柱形沥青棒,富含塑料和橡胶颗粒(从废物中获得),通过旋转和摩擦将其熔化并注入裂缝区。在分析了密封区域的技术特点和应用沥青层所需的时间后,可以在将来选择这种方法,以避免对开裂磨损层进行部分磨铣的昂贵操作,从而使使用摩擦程序通过密封(堵塞)来修复裂缝成为可能。研究结果强调了使用摩擦法降低道路维修成本,减少裂缝修复时间,保持修复区域的初始特征,加入防水材料(回收废物的塑料和橡胶颗粒),保持磨损层的良好状态,以低成本嵌入智能交通监控系统的可能性等。
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引用次数: 0
Design of a VTOL UAV for Anti-poaching Surveillance Missions in the Danube Delta 用于多瑙河三角洲反偷猎监视任务的垂直起降无人机设计
Pub Date : 2022-02-01 DOI: 10.7763/ijmo.2022.v12.796
Sorin Andrei Negru, M. Manea, G. Jiga
The main objective of the research paper is the theoretical and experimental analysis of the method proposed for sealing (clogging) cracks in asphalt, by means of a cylindrical bitumen bar, enriched with plastic and rubber granules (obtained from the use of waste), which melts and infuses into the cracked zone by rotation and friction against it. After analyzing the technical characteristics of the sealed area and the time required to apply the bitumen layer, this method can be chosen in the future to the detriment of the expensive operations of partial milling of the cracked wear layer, making possible the repair of cracks by sealing(clogging), using the friction procedure. The research results highlighted the diminution of road maintenance costs using the method of friction, the decrease of cracks repair time, maintaining the initial characteristics of the repaired area, incorporating a waterproofing material (plastic and rubbber granules from recycled waste), keeping the wear layer in good conditions, possibility of embedding an intelligent system of traffic monitoring at low costs etc.
本研究论文的主要目的是对提出的封堵(堵塞)沥青裂缝的方法进行理论和实验分析,该方法是采用一种圆柱形沥青棒,富含塑料和橡胶颗粒(从废物中获得),通过旋转和摩擦将其熔化并注入裂缝区。在分析了密封区域的技术特点和应用沥青层所需的时间后,可以在将来选择这种方法,以避免对开裂磨损层进行部分磨铣的昂贵操作,从而使使用摩擦程序通过密封(堵塞)来修复裂缝成为可能。研究结果强调了使用摩擦法降低道路维修成本,减少裂缝修复时间,保持修复区域的初始特征,加入防水材料(回收废物的塑料和橡胶颗粒),保持磨损层的良好状态,以低成本嵌入智能交通监控系统的可能性等。
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引用次数: 0
Framework of Experimental Design and Data Mining in Multi-agent Simulation 多智能体仿真实验设计与数据挖掘框架
Pub Date : 2022-02-01 DOI: 10.7763/ijmo.2022.v12.791
Fa Zhang, Shihui Wu, Zhihua Song
Multi-agent based simulation (MABS) is an important approach for studying complex systems. The Agent-based model often contains many parameters, these parameters are usually not independent, with differences in their range, and may be subjected to constraints. How to use MABS investigating complex systems effectively is still a challenge. The common tasks of MABS include: summarizing the macroscopic patterns of the system, identifying key factors, establishing a meta-model, and optimization. We proposed a framework of experimental design and data mining for MABS. In the framework, method of experimental design is used to generate experiment points in the parameter space, then generate simulation data, and finally using data mining techniques to analyze data. With this framework, we could explore and analyze complex system iteratively. Using central composite discrepancy (CCD) as measure of uniformity, we designed an algorithm of experimental design in which parameters could meet any constraints. We discussed the relationship between tasks of complex system simulation and data mining, such as using cluster analysis to classify the macro patterns of the system, and using CART, PCA, ICA and other dimensionality reduction methods to identify key factors, using linear regression, stepwise regression, SVM, neural network, etc. to build the meta-model of the system. This framework integrates MABS with experimental design and data mining to provide a reference for complex system exploration and analysis.
基于多智能体的仿真是研究复杂系统的重要方法。基于agent的模型通常包含许多参数,这些参数通常不是独立的,它们的范围存在差异,并且可能受到约束。如何利用MABS有效地研究复杂系统仍然是一个挑战。MABS的常见任务包括:总结系统宏观格局、识别关键因素、建立元模型和优化。我们提出了一个MABS的实验设计和数据挖掘框架。该框架采用实验设计的方法在参数空间中生成实验点,然后生成仿真数据,最后利用数据挖掘技术对数据进行分析。有了这个框架,我们可以迭代地探索和分析复杂的系统。以中心复合差(CCD)作为均匀性的度量,设计了一种参数可以满足任意约束条件的实验设计算法。讨论了复杂系统仿真任务与数据挖掘之间的关系,如利用聚类分析对系统的宏观模式进行分类,利用CART、PCA、ICA等降维方法识别关键因素,利用线性回归、逐步回归、支持向量机、神经网络等构建系统元模型。该框架将MABS与实验设计和数据挖掘相结合,为复杂系统的探索和分析提供了参考。
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引用次数: 0
Architectural Holarchy of the Next Generation Manufacturing System 下一代制造系统的整体架构
Pub Date : 2022-02-01 DOI: 10.7763/ijmo.2022.v12.793
G. Frumuşanu, A. Epureanu
Nowadays, the global energy network can generate and transmit, between any two points belonging to it, high quantity of energy. During recent years, a global information network, able to process, store, and transmit huge amounts of information, has been developed as well. These networks entirely cover the industrial space, already giving the opportunity to make permanently available, in any of its points, at any time, as much as needed, both energy and information. On the other hand, the mass customization trend has led to the pronounced increase of “manufacturing to order” (MTO) production, taking place in a higher and higher number of small & medium enterprises. At this level, a given manufacturing system cannot be quickly and appropriately configured to a given product, due to production high variability in range. As consequence, the manufacturing system is, quite always, more or less unadjusted to the manufactured product, its performance being significantly affected. Starting from here, the challenge is to make a conceptual rebuilding of the manufacturing system, aiming to increase its degree of appropriateness to products, by taking advantage from the opportunities brought by the existence of global energy & information networks. This paper approach is to see the next generation manufacturing system as holonic modular cyber-physical system. System architecture permanently accords to the manufactured product requirements. The function, procedure, topology and holarchy model of the system are presented. The main features of the system are also revealed.
如今,全球能源网络可以在属于它的任意两点之间产生和传输大量的能源。近年来,一个能够处理、存储和传输海量信息的全球信息网络也得到了发展。这些网络完全覆盖了整个工业空间,已经提供了在任何地点、任何时间、尽可能多地永久获得能源和信息的机会。另一方面,大规模定制趋势导致“按订单制造”(MTO)生产的显著增加,在越来越多的中小企业中出现。在这个级别上,由于生产范围的高度可变性,给定的制造系统不能快速和适当地配置到给定的产品。因此,制造系统总是或多或少地无法适应制造产品,其性能受到显著影响。从这里开始,挑战是通过利用全球能源和信息网络带来的机遇,对制造系统进行概念性重建,旨在提高其对产品的适合程度。本文的方法是将下一代制造系统看作是全息模块化信息物理系统。系统架构始终符合制造产品的要求。给出了系统的功能、流程、拓扑结构和整体模型。介绍了系统的主要特点。
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引用次数: 0
Multi-objective Optimization of a Mechatronic Solar Tracking Mechanisms 某机电一体化太阳跟踪机构的多目标优化
Pub Date : 2021-11-01 DOI: 10.7763/IJMO.2021.V11.789
C. Alexandru
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引用次数: 0
A Mathematical Model for Tool Sharing between Workers by Exact Solution Approach 用精确解法建立工人共用刀具的数学模型
Pub Date : 2021-11-01 DOI: 10.7763/IJMO.2021.V11.790
Ashish Yadav, Jabalpur India Manufacturing
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引用次数: 0
Software Platform for the Assisted Research of the Kinematics and Dynamics of Industrial Robots 工业机器人运动学与动力学辅助研究的软件平台
Pub Date : 2021-11-01 DOI: 10.7763/IJMO.2021.V11.784
A. Olaru, T. Dobrescu, S. Olaru, I. Mihai
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引用次数: 1
期刊
International Journal of Modeling and Optimization
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