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arXiv 2017年

作者： Emmert-Streib, Frank Musa, Aliyu Baltakys, Kestutis Kanniainen, Juho Tripathi, Shailesh Yli-Harja, Olli Jodlbauer, Herbert Dehmer, Matthias Predictive Medicine and Data Analytics Lab Department of Signal Processing Tampere University of Technology Finland Institute of Biosciences and Medical Technology Tampere Finland Industrial and Information Management Tampere University of Technology Tampere Finland Institute for Systems Biology Seattle United States Institute for Intelligent Production Faculty for Management University of Applied Sciences Upper Austria Steyr Campus Austria Department for Biomedical Computer Science and Mechatronics UMIT - The Health and Lifesciences University Hall in Tyrol Austria College of Computer and Control Engineering Nankai University Tianjin300350 China

In recent years, methods from network science are gaining rapidly interest in economics and finance. A reason for this is that in a globalized world the interconnectedness among economic and financial entities are crucial to understand and networks provide a natural framework for representing and studying such systems. In this paper, we are surveying the use of networks and network-based methods for studying economy related questions. We start with a brief overview of graph theory and basic definitions. Then we discuss descriptive network measures and network complexity measures for quantifying structural properties of economic networks. Finally, we discuss different network and tree structures as relevant for applications. Copyright © 2017, The Authors. All rights reserved.

关键词： Finance

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Proposal for a function generator and extrapolation analysis

Proposal for a function generator and extrapolation analysis

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International Symposium on Innovations in Intelligent Systems and Applications, INISTA 2015

作者： Belz, Julian Nelles, Oliver University of Siegen Department of Mechanical Engineering Institute of Mechanics and Control Engineering-Mechatronics Siegen57068 Germany

ISBN: (纸本)9781467390965

We propose a polynomial-based function generator to support decision-making in the context of experimental modeling (identification). The function generator tries to imitate regression problems in engineering applications. Stochastic elements ensure high variability between generated functions, while the user is able to choose a general complexity level defined by the strength of the nonlinearity and the order of interactions. An extension to overcome unfavorable properties of the polynomial-based structure is made. The ability to generate an arbitrary amount of test functions offers the possibility to statistically secure decisions in the development of algorithms or for the modeling task at hand. To demonstrate the abilities of our proposed function generator, it is utilized to pick a strategy for the design of experiments that should be used for the metamodeling of a centrifugal fan. We show, that for the application at hand the inclusion of all corners in the experimental design is destructive for the meta model's generalization performance. © 2015 IEEE.

关键词： Design of experiments

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Properties of carbide electro-spark coatings after laser processing

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AIP Conference Proceedings 2018年第1期2017卷

作者： Norbert Radek Izabela Pliszka Aneta Gądek-Moszczak Jarosław Rolek Jana Petru 1Kielce University of Technology Faculty of Mechatronics and Mechanical Engineering Al. 1000-lecia Państwa Polskiego 7 25-314 Kielce Poland 2Cracow University of Technology Institute of Applied Informatics Faculty of Mechanical Engineering Al. Jana Pawła II 37 31-864 Cracow Poland 3Kielce University of Technology Faculty of Electrical Engineering Automatic Control and Computer Science Al. 1000-lecia Państwa Polskiego 7 25-314 Kielce Poland 4VSB-TU Ostrava Faculty of Mechanical Engineering Department of Machining Assembly and Engineering Metrology 17. listopadu 15/2172 70833 Ostrava-Poruba Czech Republic

The aim of the study was to determine the influence of the laser processing on the properties of electro-spark coatings. The properties were assessed by analyzing the coating microstructure, X-ray radiation, microhardness, corrosion resistance, porosity and tribological tests. In addition, the paper presents the results of measurements and analysis of electrical pulse during ESD. The tests were carried out on WC-Cu coating (the anode) obtained by electro spark deposition over carbon steel C45 (the cathode) and molten with a laser beam. The coatings were deposited by means of the EIL-8A and they were laser treated with the Nd:YAG. The tests show that the laser-treated electro-spark deposited WC-Cu coatings are characterized by lower hardness and friction force, higher seizure resistance, roughness. The laser treatment process causes the homogenization of the chemical composition, the structure refinement and the healing of microcracks and pores of the electro-spark deposited coatings. Laser treated electro-spark deposited coatings are likely to be applied in sliding friction pairs and as protective coatings.

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Inverse Kinematics of a 3 DOF Parallel Manipulator: A Conformal Geometric Algebra Approach

Inverse Kinematics of a 3 DOF Parallel Manipulator: A Confor...

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IEEE-RAS International Conference on Humanoid Robots

作者： O. Carbajal-Espinosa F. Izar-Bonilla M. Diaz-Rodriguez E. Bayro-Corrochano Department of Electronics and Mechatronics Engineering Instituto Tecnologico y de Estudios Superiores de Monterrey Department of Computer Science Instituto Tecnologico de Zapopan Automatic Control Laboratory Cinvestav Unidad Guadalajara

ISBN: (纸本)9781509047192

In this paper we propose a method to solve the inverse kinematic of a 3 DOF parallel manipulator, best know as Stewart platform. Using the entities of the rotors and motors it is possible define an algorithm to find the joint values of each actuator that allow to reach the desired position and orientation of the manipulator, describing only one geometric solution for one arm of the platform and applying a rigig transformation to this solution in order to define the solution for the rest of the arms of the robot. Simulations and real time implementation of the algorithm were done to prove the effectiveness of the proposal.

关键词： Algebra Manipulators Kinematics Humanoid robots Rotors Service robots Rotors Humanoid robots Service robots Manipulators Algebra kinematics inverse kinematics DEPTH OF FIELD Arm spiral arm

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Micro-scratching tests of a rolled aluminium alloy AA2024-T351 thick plate using a diamond micro-blade

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IOP Conference Series: Materials Science and engineering 2017年第1期174卷

作者： E Pirva A Tudor A Gavrus G Chisiu N Stoica A Predescu Machine Elements and Tribology Department Faculty of Mechanical Engineering and Mechatronics University POLITEHNICA of Bucharest 313 Independentei Street Bucharest Romania Mechanical and Control System Engineering Departament Mechanical and Civil Engineering Laboratory LGCGM-EA3913 INSA Rennes France

The present research work is focused on investigating the apparent coefficient of abrasive friction of a rolled thick plate of an AA2024-T351 aluminium alloy, using micro-scratch tests. For this study, specific materials specimens and a particular UMT Micro-Scratch Equipment were used. The test involved the generation of a scratch process at a local scale using a diamond stylus (micro-blade defined by a radius of 0.8 μm) moving along a specified path under a constant normal force (10 N) and with a constant speed (0.2 mm/s). For the characterization of the surface quality, two orthogonal directions were considered: the longitudinal one, along the rolling direction, and the corresponding transversal one. Given the fractal nature of the surface, an investigation was done in order to assess its influence on the coefficient of abrasive friction. The fractal dimension Df, one of the most important parameters in a fractal surface analysis, was used to determine this influence in the global friction and abrasion phenomena. The abrasion factor was calculated using the Zum Gahr method for the data obtained with a specialized Mitutoyo SJ-301 surface tester. Measurements were made at the beginning, middle and at the end of the scratch channel. The obtained value for the abrasion factor was slightly less than zero. Other influences of anisotropic material features on global abrasion effects were also analyzed via comparisons of the coefficients of abrasive friction for both static and kinematic conditions.

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A hybrid open MP/MPI parallel computing model design on the SM cluster 6

A hybrid open MP/MPI parallel computing model design on the ...

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6th International Conference on Power Electronics Systems and Applications, PESA 2015

作者： Xu, Ying Zhang, Tie Department of Mechatronics and Control Engineering Shenzhen University China Department of Mechanical and Automotive Engineering South China University of Technology China

ISBN: (纸本)9781509000623

In the integrated power system, the traditional parallel algorithm is difficult to achieve system electromagnetic transient simulation, so a hybrid parallel computing model was proposed. Two kinds of parallel programming models (OpenMP shared-memory and MPI message-passing) are widely used on the SMP (Symmetric Multi-Processors) cluster. By comparing different programming paradigms for parallelization on the nodes of a SMP cluster, we obtain a parallel computing model that shows high performance. When parallel communication is low, using MPI programming purely will be more efficient. Otherwise, the hybrid MPI/OpenMP parallel programming model can be used to achieve better results. The main characteristic of the hybrid programming model is that the whole project is divided into segments according to the hierarchical structure of the task being executed, and this division is based on the principle of system load balance. Task level process adopts MPI for inter-SMP nodes communication, and uses OpenMP for intra-SMP node parallelization inside each processor. Experimental results show that this hybrid parallel computing model yields high performance and works very effectively. © 2015 IEEE.

关键词： Message passing

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Characteristics of GaAs power MESFETs with double silicon ion implantations for wireless communication applications

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Open Materials Science Journal 2016年 10卷 29-36页

作者： Zheng, Chun-Yi Chiang, Wen-Jung Lai, Yeong-Lin Chang, Edward Y. Chen, Shen-Li Wang, K.B. Department of Mechatronics Engineering National Changhua University of Education Changhua50007 Taiwan Mechatronic Integration and System Control Research Center National Changhua University of Education Changhua50007 Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu30010 Taiwan Department of Electronic Engineering National United University Miaoli36063 Taiwan

GaAs power metal-semiconductor field-effect transistors (MESFETs) were fabricated using direct double silicon (Si) ion implantation technology for wireless communication applications. A 150-μm MESFET had a saturation drain current of 238 mA/mm after Si3N4passivation. A 15-mm MESFET, when measured under a class-AB condition with a biased drain voltage of 3.4 V and a quiescent drain current of 600 mA, delivered a maximum output power (Pout) of 31.1 dBm and a maximum power-added efficiency (PAE) of 58.0% at a frequency of 1.88 GHz. The MESFET exhibited a Poutof 29.2 dBm with a PAE of 45.0% at the 1-dB gain compression point. The MESFET, when measured under a deep class-B condition with a biased drain voltage of 4.7 V and a quiescent drain current of 50 mA, achieved a maximum Poutof 33.1 dBm and a maximum PAE of 55.9% at 1.88 GHz. The MESFET operating at 4.7 V and 1.88 GHz exhibited a P1dBof 31.8 dBm and an associated PAE of 47.1% at the 1-dB gain compression point. When tested by IS-95 code-division multiple access (CDMA) standard signals and biased at 4.7 V under the deep class-B condition, the MESFET with a Poutof 28 dBm demonstrated an adjacent channel power rejection (ACPR) of –31.2 dBc at +1.25 MHz apart from the 1.88 GHz center frequency and –45.7 dBc at +2.25 MHz. © Lai et al.

关键词： Code division multiple access

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Evaluation of temperature and relative humidity on two types of zero energy cool chamber (ZECC) in South Sulawesi, Indonesia

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IOP Conference Series: Earth and Environmental Science 2017年第1期101卷

作者： Andi Dirpan Muhammad Tahir Sapsal Abdul Kadir Muhammad Mulyati M Tahir Rahimuddin Department of Agricultural Technology Hasanuddin University Makassar 90245 Indonesia Center for Mechatronics and Control System Mechanical Engineering Department State Polytechnic of Ujung Pandang Jl. Perintis Kemerdekaan KM 10 Makassar 90245 Indonesia Department of Marine Engineering Hasanuddin University Makassar 90245 Indonesia

Zero Energy Cool Chamber (ZECC) is a cooling chamber for storing fruits and vegetables from the viewpoints of low cost and energy savings. The aim of the present study is to evaluate temperature and relative humidity (RH) on two types of zero energy cool chamber (ZECC) in South Sulawesi, Indonesia. The first category was placed underground while the second category was on the surface. Then, the performance of the ZECC was measured by calculating temperature and relative humidity. The results show that the ZECC was constructed on the surface produce lower temperature and higher RH compare to ZECC which placed underground. In average, the temperature in the outside (28.0°C) is greater than in inside (26.2°C) of the ZECC. On the other hand, the relative humidity in the outside (72.9%) is less than in inside (87.2%) of the ZECC. It was concluded that the ZECC where was constructed on the surface is more suitable than ZECC in the underground for decreasing temperature and increasing relative humidity.

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Identification of modal parametrs of transmission towers

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Diagnostyka 2016年第4期17卷 33-38页

作者： Lech, Lukasz Iwaniec, Marek Iwaniec, Joanna AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Process Control Mickiewicz Alley 30 Krakow30-059 Poland AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Robotics and Mechatronics Mickiewicz Alley 30 Krakow30-059 Poland

The paper presents theoretical basis for identification of nonlinear systems using the method based on Hilbert transform. Discussed method was verified by analyzing the synthesized signals of known parameters. Developed and verified mathematical tools were used for analysis of dynamic responses of the real object: a laboratory (physical) model of the transmission tower. For the considered laboratory model it was possible to simulate damages of individual truss elements and observe changes in system dynamic characteristics. Results of the carried out research proved that the first natural frequency and damping factor change in the observable extent as a result of damage presence. © 2016, Polish Society of Technical Diagnostics. All rights reserved.

关键词： Modal analysis

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Disturbance rejection using Model Predictive control for pneumatic actuator system

Disturbance rejection using Model Predictive control for pne...

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International Colloquium on Signal Processing & Its Applications, CSPA

作者： Siti Fatimah Sulaiman M. F. Rahmat Ahmad 'Athif Mohd Faudzi Khairuddin Osman Department of Industrial Electronics Universiti Teknikal Malaysia Melaka Durian Tunggal Melaka Malaysia Department of Control and Mechatronics Engineering Universiti Teknologi Malaysia UTM Johor Bahru Johor Malaysia Universiti Teknologi Malaysia Skudai Johor MY

ISBN: (纸本)9781467387811

`Disturbance' is one of the main reasons why the position control in pneumatic system is difficult to achieve. Disturbance can cause the process (controlled variable) to deviate from their respective set-point and at the same time tracking the set-point is quite impossible. The controller is said to be good if it has the ability to reject the disturbance, as this will ensure the stability of the controller itself. This paper presents the performance analysis of Model Predictive controller (MPC) to reject the disturbance added into the system while controlling the position of cylinder's stroke for pneumatic actuator system. The disturbance was added into the system in order to test the performance of the controllers in rejecting the disturbance. The input constraint was also applied to the MPC algorithm to make the controller operates closer to the limits. In this paper, the performance of MPC in rejecting the disturbance as well as controlling the position of the pneumatic actuator system was compared with Proportional-Integral (PI) controller. Simulation results show the constrained MPC is more effective than unconstrained MPC and PI controller in producing better transient response and minimizing error.

关键词： Pneumatic actuators Mathematical model Pneumatic systems Signal processing algorithms Silicon Valves

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