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IEEE Latin American Robotics Symposium, LARS

作者： M. A. Pastrana Karine R. Santos Alceu B. C. de Farias Daniel M. Muñoz Department of Mechanical Engineering Mechatronics Graduate Program Automation and Control Group/GRACO University of Brasilia Brasilia DF Brazil Faculty of Gama Biomedical Engineering Graduate Program University of Brasilia Brasilia DF Brazil Faculty of Gama Electronics Engineering Undergraduate Program University of Brasilia Brasilia DF Brazil

ISBN: (数字)9781665462808

ISBN: (纸本)9781665462815

With the advancement of technology, systems in many different areas of application have become more complex, and obtaining reliable mathematical models is a task that is increasingly becoming more difficult as well. To overcome these issues, new methodologies have emerged, such as the one known as Data-Driven-Control (DDC), which uses the input and output data of the system to design a controller, and Behavior-Based-Control (BBC), which provides the controller based on the desired behavior of a system. In this work, these two methodologies were applied to obtain the transfer function of a Single-Input Single-Output mobile robotic platform that moves parallel to a wall. A Proportional Integral Derivative controller was used to control the left wheel, while the right wheel was set to a constant speed, allowing the mobile robot to maintain a constant distance from the wall. The controller was tuned utilizing root locus methodology with an overshot of 16.7%, settling time of 6.45 seconds, and a static error of 2.1%. Additionally, disturbances were added to test the robustness of the mobile robot model and the PID controller.

关键词： Analytical models Biological system modeling Wheels Transfer functions Robot sensing systems Control systems Mathematical models

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Prediction of Internet Broadband Connectivity Classification in West Java Indonesia using Machine Learning

Prediction of Internet Broadband Connectivity Classification...

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Artificial Intelligence Robotics, Signal and Image Processing (AIRoSIP), International Conference on

作者： Wahyu Haris Kusuma Atmaja Yaya Heryadi Ilvico Sonata Lukas Wayan Suparta Computer Science Department Binus Graduate Program - Computer Science Bina Nusantara University West Jakarta Indonesia Cognitive Engineering Research Group (CERG) Universitas Katolik Indonesia Atma Jaya Jakarta Indonesia Department of Electrical Engineering Faculty of Industrial Engineering Institut Teknologi Nasional Yogyakarta Yogyakarta Indonesia

ISBN: (数字)9798350327472

ISBN: (纸本)9798350327489

A location's Take-up Rate was significantly influenced by its Internet connectivity and availability. The purpose of this research is to answer concerns about internal Internet Service Provider issues that affect Internet connectivity in clusters of West Java, Indonesia. It also aims to evaluate the results of models that forecast how these internal factors will affect internet connectivity. According to the research findings, the FTTH Cluster has eight significant Internet predictor connectivity out of 18 elements. Activation delay and Administration Documentation of Activation with Connectivity were the two major parameters modeled out of the 18 components. Artificial Neural Network (ANN), Support Vector Machine (SVM), and Decision Tree (DT) models were used to predict Internet Broadband Connectivity Classification based on the two most important variables. According to the study, ANN is the best model, with 99% accuracy and 99.6% precision when compared to SVM and DT. Furthermore, it exceeds previous studies that used the ANN model and achieved 97.92% accuracy.

关键词： Support vector machines Java Accuracy Web and internet services Artificial neural networks Predictive models Internet Broadband communication Optical fiber subscriber loops Robots

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Don’t-Care Aware ESOP Extraction via Reduced Decomposition-Tree Exploration

Don’t-Care Aware ESOP Extraction via Reduced Decomposition-...

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Design Automation Conference

作者： Chun-Yu Wei Jie-Hong R. Jiang Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Center for Quantum Science and Engineering National Taiwan University Taipei Taiwan Physics Division National Center for Theoretical Sciences Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

Exclusive-OR Sum-of-Products expressions (ESOPs) are vital for circuit synthesis of arithmetic functions and emerging technologies. The state-of-the-art ESOP extraction methods are limited in their inefficient exhaustive exploration strategy, significant optimality loss in the divide-and-conquer process, and incapability of handling don’t-cares. This work overcomes these limitations by reduced decomposition exploration with a cost estimation and refinement strategy, generally applicable to incompletely specified functions. Experiments show up to 29× (average 12×) runtime and 28× (average 13×) memory-usage improvements with a quality close to the exact optimum obtained by exhaustive exploration for completely-specified functions, and substantial ESOP simplification with don’t-cares for incompletely-specified functions.

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Photonic Characterization and Modeling of Highly Efficient Color Conversion Layers With External Reflectors

IEEE Photonics Journal

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IEEE Photonics Journal 2023年第4期15卷 1页

作者： Lee, Guan-Ying Weng, Shao-Yi Ho, Wan-Hua Huang, Chun-Wei Chao, Han-Yu Huang, Sheng-Kai Kuo, Hao-Chung Wu, Chung-Chih Lin, Chien-Chung National Yang Ming Chiao Tung University Institute of Photonic System College of Photonics Tainan711 Taiwan National Taiwan University Graduate Institute of Electronics Engineering Taipei106 Taiwan National Taiwan University Graduate Institute of Photonics and Optoelectronics Taipei106 Taiwan National Yang Ming Chiao Tung University Department of Photonics Hsinchu300 Taiwan National Taiwan University Department of Electrical Engineering The Graduate Institute of Photonics and Optoelectronics The Graduate Institute of Electronics Engineering Taipei106 Taiwan

We propose a new method for fabricating arrays of colloidal quantum dots for color conversion layers (CCLs) with atomic layer deposited (ALD) encapsulation. Semiconductor processes were used to transfer the CCL onto a transparent glass substrate. This method enables pixels as small as 5 μm, and the pixel's size and pitch can be controlled through the semiconductor process and mask layout. A dual-color array with a red-and-green CCL was also demonstrated to be suitable for microdisplay applications in experiments. The best color conversion efficiency of a single color CCL reached as high as 20.7%. A set of distributed Bragg reflector mirrors was used to increase photon recycling, and these mirrors yielded an increase in peak intensity of 35.7%. We formulated a model of incoherent reflection and transmission to calculate the changes in CCL properties when mirrors are added;this model had close fit with results from experiments in which mirrors of different reflection coefficients were used. Through the use of ALD, the CCL can be stored at a normal room-temperature environment for more than 9000 hours, and the projected lifetime is linearly extrapolated to be 44,041 hours. © 2009-2012 IEEE.

关键词： Nanocrystals

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CPU Clock Rate Control based on ART Application Behavior Monitoring without JIT

CPU Clock Rate Control based on ART Application Behavior Mon...

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IEEE International Conference on Consumer electronics-Taiwan (ICCE-TW)

作者： Kota Kumakura Takeshi Kamiyama Masato Oguchi Saneyasu Yamaguchi Electrical Engineering and Electronics Kogakuin University Graduate School Tokyo Japan School of Information and Data Sciences Nagasaki University Nagasaki Japan Department of Information Sciences Ochanomizu University Tokyo Japan Department of Information and Communications Engineering Kogakuin University Tokyo Japan

One of the most important issues in smartphones is power consumption. The CPU is one of the most power-consuming devices, and controlling the CPU clock rate affects the device's power consumption and performance. However, there is a trade-off between improving device performance and reducing power consumption. Increasing the CPU clock rate improves performance but increases power consumption. Conversely, decreasing the CPU clock rate reduces performance but helps reduce power consumption. Therefore, it is ideal to decrease the CPU clock rate when and only when its usage is low. However, the Linux kernel installed on Android smartphones controls the CPU clock rate by tracking past CPU usage. Therefore, when the CPU usage changes rapidly, there is a time lag between the CPU usage and the CPU clock rate. To address this issue, in our previous work, we proposed a CPU clock rate control concept based on observation of the behavior of the foreground application. In this paper, we demonstrate the effectiveness of the previously proposed method by implementing a simple CPU clock rate control system and comparing it with the existing scaling controller.

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Occurrence Probability of SNI in Accessing Service for Improving Accuracy of Service Identification

Occurrence Probability of SNI in Accessing Service for Impro...

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IEEE International Conference on Consumer electronics-Taiwan (ICCE-TW)

作者： Ryo Asaoka Akihiro Nakao Masato Oguchi Saneyasu Yamaguchi Electrical Engineering and Electronics Kogakuin University Graduate School Tokyo Japan Interfaculty Initiative in Information Studies The University of Tokyo Tokyo Japan Department of Information Sciences Ochanomizu University Tokyo Japan Department of Information and Communications Engineering Kogakuin University Tokyo Japan

Identifying the service to be connected from an IP flow is beneficial for various applications, and a method of identifying the service based on the SNIs occurring in the flow was proposed. It was also shown that the identification accuracy could be improved by excluding some SNIs from those for identification. However, no discussion has been published on the probability of SNIs occurring in actual service accesses. In this paper, we compare the probability of occurrence of each SNI in each service and show that there are redundant SNIs whose probabilities are the same, and there is one SNI that occurs in all services with similar probabilities and is not useful for service identification. We then show that identification accuracy can be improved by excluding the SNI that occurs in all services from the service identification data.

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Combining optical diffraction tomography with imaging flow cytometry for characterizing morphology, hemoglobin content, and membrane deformability of live red blood cells

arXiv

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arXiv 2023年

作者： Chang, Yu-Hsiang Lin, Yang-Hsien Sung, Kung-Bin Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taiwan Department of Electrical Engineering National Taiwan University Taiwan Molecular Imaging Center National Taiwan University Taiwan

Integrating optical diffraction tomography with imaging flow cytometry enables label-free quantifications of the three-dimensional (3D) morphology and hemoglobin content of red blood cells (RBCs) in their natural form. Self-rotation of RBCs flowing in a microfluidic channel has been utilized to achieve various projection directions for 3D reconstruction. However, the practicality of this technique has not been sufficiently studied. We improved the accuracy of estimating the rotation angle of RBCs and demonstrated 3D reconstructions of both healthy and glutaraldehyde-treated RBCs. Results showed the capability to quantify changes in RBC morphology, hemoglobin content, and membrane fluctuations generated by glutaraldehyde treatments, demonstrating the potential to detect changes frequently present in various RBC membrane disorders. © 2023, CC BY-NC-SA.

关键词： Hemoglobin

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Design of a 3 Degree-of-Freedom Upper-Limb Active Exoskeleton with Cable-Driven Actuators for Neuromotor Rehabilitation

Design of a 3 Degree-of-Freedom Upper-Limb Active Exoskeleto...

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Colombian Caribbean Conference (C3), IEEE

作者： Eduardo Dias Pedro Ulhoa Rafhael Andrade Department of Mechanical Engineering. Universidade Federal do Espírito Santo Vitória Brazil Department of Electrical Engineering Universidade Federal do Espírito Santo Vitória Brazil Graduate Program in Mechanical Engineering Universidade Federal do Espírito Santo Vitória Brazil

Exoskeletons are wearable mechanisms which, parallel to the wearer’s joints, modulate movements through active or passive torque application. While existing upper-limb exoskeletons offer benefits in strength augmentation and therapy, they often suffer from limited degrees of freedom and excessive bulk, hindering their utility in neuromotor rehabilitation. This study introduces a three degree-of-freedom active upper-limb exoskeleton optimized for neuromotor rehabilitation. Employing anthropometric data and rigorous kinematic analysis, the design accommodates elbow flexion/extension, forearm pronation/supination, and hand gripping. The upper limb dynamics, kinematics, and physiology were evaluated to provide adequate joint ranges of motion. Cable-driven actuators in the elbow and forearm joints were designed to provide low worn weight through the relocation of the motor units away from the user’s joints. The result is a lightweight, compact exoskeleton that provides optimal conditions for neuromotor rehabilitation. Finally, a preliminary control strategy was tested using myoelectric signals to trigger motion.

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Microstructuring of cobalt (Co) thin films by UV laser irradiation

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Applied Physics A: Materials Science and Processing 2023年第12期129卷 864-864页

作者： Itapu, Srikanth Borra, Vamsi Selvendran, S. Department of Electronics and Communication Engineering Alliance University Chandapura-Anekal Road Bengaluru562106 India Electrical and Computer Engineering Program Rayen College of Engineering Youngstown State University 1 University Plaza YoungstownOH44555 United States Vellore Institute of Technology Chennai Kelambakam-Vandaloor Road Chennai600127 India

This work reports the microstructuring of cobalt (Co) thin films by high-energy UV pulsed laser irradiation. The parameters responsible for the efficient formation of such microstructures include laser fluence and film parameters. Cracks and island formations were observed for Co thin films deposited by RF sputtering. Such rough films rendered to produce inefficient microstructuring. To overcome this limitation, Co thin films were deposited by vacuum evaporation resulting in a smooth thin film compatible for laser-induced microstructuring. Two stages of conical patterning are discussed in terms of localized melting and abrupt condensation of the melted Co film owing to laser irradiation. An efficiency of 90% for laser-based microstructuring suggests that it is an efficient and non-invasive technique for fabricating nanostructures. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

关键词： Vacuum evaporation

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Fault Analysis of a Ladle Furnace Transformer caused by Switching Transient and Ferroresonance

Fault Analysis of a Ladle Furnace Transformer caused by Swit...

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International Conference on engineering and Emerging Technologies (ICEET)

作者： Virna C. Onofri Thales A. C. Maia Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil

ISBN: (纸本)9781665491075

Electric Arc Furnace and Ladle Furnace transformers are very important in steel production industry. The overvoltages caused by vacuum circuit breaker during operation are very repetitive and can lead to failures and, consequently, large financial losses. The use of protection devices, as RC filters and surge arresters, can attenuate theses transient overvoltages. However, the clamping of one of the circuit breaker phases, which is a common event to occur in a system like this, can cause failure to one of the phases of the transformer protection system, due to ferroresonance effect. Operation of this transformer without one of the phases of the RC filter and surge arrest will likely lead it to failure after repetitive overvoltages. This paper presents the study and analysis of the cause of insulation failure in a no-load Ladle Furnace (LF) transformer caused by overvoltages during vacuum circuit breaker switching transients and by ferroresonance effects. The system of a real steel mill is modelled and will be used to perform simulations in Simulink/Matlab.

关键词： Insulation Furnaces Circuit breakers Ferroresonance Steel Surges Integrated circuit modeling

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