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arXiv 2019年

作者： Huh, Keon Yang, So-Yoon Park, Jae Suk Lee, Jung A. Lee, Hyomin Kim, Sung Jae Department of Electrical and Computer Engineering Seoul National University Seoul08826 Korea Republic of Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Inter-university Semiconductor Research Center Seoul National University Seoul08826 Korea Republic of Department of Chemical and Biological Engineering Jeju National University Jeju63243 Korea Republic of Nano Systems Institute Seoul National University Seoul08826 Korea Republic of

Dielectric microstructures have been reported to have negative influences on perm-selective ion transportation because ions do not migrate in areas where the structures are located. However, the structure can promote the transportation if the membrane is confined to a microscopical scale. In such scale where the area to volume ratio is significantly large, the primary driving mechanisms of the ion transportation are transited from electro-convective instability (EOI) to surface conduction (SC) and electroosmotic flow (EOF). Here we provide rigorous evidence on how SC and EOF around the dielectric microstructures can accelerate the ion transportation by multi-physics simulations and experimental visualizations. The microstructures further polarize the ion distribution by SC and EOF so that ion carriers can travel to the membrane more efficiently. Furthermore, we verified, for the first time, that the arrangements of microstructures have a critical impact on the ion transportation. While convective flows are isolated in crystal pillar configuration, the flows show elongated pattern and create an additional path for ion current in the aligned pillar configuration. Therefore, the fundamental findings of the electrokinetic effects on the dielectric microstructures suggest an innovative application in an energy-efficient micro/nanofluidic devices. Copyright © 2019, The Authors. All rights reserved.

关键词： Electrohydrodynamics

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A portable engine dynamometer test cell for studying spark-ignition engine performance and mechanical-electrical-thermodynamic energy conversion 125

A portable engine dynamometer test cell for studying spark-i...

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125th ASEE Annual Conference and Exposition

作者： Harding, Gene L. Prygoski, Megan Burns, James Carmichael, Brian Jeffrey Engstrom, Matthew S. Department of Electrical and Computer Engineering Technology Purdue University Purdue Polytechnic Institute United States Purdue University West Lafayette United States Security Automation Systems United States

Automotive spark-ignition engines are great platforms for studying a variety of sensors, actuators, and control algorithms, but the size, expense, and maintenance required for an automotive engine coupled with a dynamometer test cell are impractical for many engineering and engineering technology programs. This paper proposes a portable engine-dynamometer test cell using a one-cylinder all-terrain vehicle (ATV) engine driving a set of high-current alternators. Engine loading is to be accomplished with a set of electric resistance heaters and a power switching array. Although associated with a large university, this project is being undertaken by a satellite campus with limited space and financial resources. The plan is to implement the Engine-Dyno Project in phases over a period of years using primarily undergraduate students working on directed projects. The planned phases at this time are as follows: 1. Build a sturdy but portable cart to hold the engine, load cell, accessories, and controls. (This phase is complete.) 2. Install the engine and get it running with no load (complete). 3. Construct a thermoelectric loading system and test the engine using manual switching of the electrical load. 4. Implement and test an electronic control system to dynamically adjust loading. 5. Implement and test a dynamometer control and data acquisition system to perform automated test runs while recording data. 6. Convert the engine to electronic ignition and fuel injection and run baseline tests. 7. Design and implement an engine control system with user-programmable ignition and fuel system parameters, and appropriate test points for monitoring sensor data and controlling actuators. 8. Develop labs for the following courses: Introduction to Automotive Electronics, ECET 38501 (lecture) and ECET 38502 (lab), Heat and Power, MET 22000, and Applied Thermodynamics, MET 32000. The paper begins with background information about how the Engine-Dyno project came about along with a high-

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Robust Trajectory Planning for a Multirotor against Disturbance based on Hamilton-Jacobi Reachability Analysis

Robust Trajectory Planning for a Multirotor against Disturba...

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2019 IEEE/RSJ International Conference on Intelligent Robots and systems (IROS)

作者： Hoseong Seo Donggun Lee Clark Youngdong Son Claire J. Tomlin H. Jin Kim >Automation and Systems Research Institute and Department of Mechanical and Aerospace Engineering Seoul National University Seoul South Korea Department of Mechanical Engineering University of California Berkeley USA Department of Mechanical and Aerospace Engineering Seoul National University Seoul South Korea Department of Electrical Engineering and Computer Sciences University of California Berkeley USA Institute of Engineering Research and Department of Mechanical and Aerospace Engineering Seoul National University Seoul South Korea

Ensuring safety in trajectory planning of multirotor systems is an essential element for risk-free operation. Even if the generated trajectory is known to be safe in the planning phase, unknown disturbance during an actual operation can lead to a dangerous situation. This paper proposes safety-guaranteed receding horizon planning against unknown, but bounded, disturbances. We first characterize forward reachable set (FRS) of the system, the set of states after a certain duration considering all possible disturbances, using Hamilton-Jacobi (HJ) reachability analysis. To compute the FRSs in real-time, we conservatively approximate the true FRS and perform ellipsoidal parameterization on the FRSs. Using the FRSs, we can plan a robust trajectory that avoids risky regions and rapidly re-plan the trajectory when the system encounters sudden disturbance. The proposed method is validated through an experiment of avoiding obstacles in a wind.

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Robot Force Control on a Beating Heart

Robot Force Control on a Beating Heart

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作者： Cortesão, Rui Dominici, Michel Department of Electrical and Computer Engineering Institute of Systems and Robotics University of Coimbra Coimbra3030 Portugal Institute of Systems and Robotics University of Coimbra Coimbra3030 Portugal

Cardiac interventions have to deal with several difficulties, where heart motion is a major one. This paper addresses the heart motion compensation problem under contact, relying on robot force control techniques. A double active observer (AOB) architecture is proposed to tackle precise force control in the presence of heart motion. One AOB controls the desired interaction force, and the other one is responsible for compensating heart motion autonomously. Three-degrees of freedom (DOF) force tracking on top of a beating heart is presented, showing that with the proposed control architecture, it is possible to have force controlled interventions with root mean square errors below 0.56 N (based on raw data). The 4-DOF whole arm manipulator (WAM) from Barrett Technologies is the medical arm, while another 3-DOF robot carrying an ex vivo heart generates heart motion based on recorded biosignals. © 2017 IEEE.

关键词： Force control

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Attention mechanism enhanced kernel prediction networks for denoising of burst images

arXiv

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arXiv 2019年

作者： Zhang, Bin Jin, Shenyao Xia, Yili Huang, Yongming Xiong, Zixiang School of Information Science and Engineering Southeast University Nanjing210096 China Jiangsu Industrial Technology Research Institute Nanjing211111 China Department of Electrical and Computer Systems Engineering Texas A&M University TX77843 United States

Deep learning based image denoising methods have been extensively investigated. In this paper, attention mechanism enhanced kernel prediction networks (AME-KPNs) are proposed for burst image denoising, in which, nearly cost-free attention modules are adopted to first refine the feature maps and to further make a full use of the inter-frame and intra-frame redundancies within the whole image burst. The proposed AME-KPNs output per-pixel spatially-adaptive kernels, residual maps and corresponding weight maps, in which, the predicted kernels roughly restore clean pixels at their corresponding locations via an adaptive convolution operation, and subsequently, residuals are weighted and summed to compensate the limited receptive field of predicted kernels. Simulations and real-world experiments are conducted to illustrate the robustness of the proposed AME-KPNs in burst image denoising. Copyright © 2019, The Authors. All rights reserved.

关键词： Convolution

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A Modularized Design for Output Synchronization of LTI Dynamical Networks with Communication Delays

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SICE Journal of Control, Measurement, and System Integration 2018年第6期11卷 495-501页

作者： Hayato Dan Takeshi Hatanaka Hyungbo Shim Department of Systems and Control Engineering Tokyo Institute of Technology Division of Electrical Electronic and Information Engineering Osaka University ASRI Department of Electrical and Computer Engineering Seoul National University

In this paper, we address output synchronization for a network of heterogeneous agents with linear time invariant single-input-single-output dynamics in the presence of communication delays. To this end, we present a three-stage modularized design procedure: (i) a parallel feedforward compensator is designed to convert the dynamics to a minimum-phase system with relative degree one, (ii) the resulting system is then transformed into a feedback equivalent to a passive system, and (iii) the agents are interconnected based on a passivity-based output synchronization law. The benefit of the present control scheme is that not only implementation but also the design stage of the controller is distributed, namely the agents do not need to know the entire network structure. The present solution is then shown to achieve output synchronization. We finally demonstrate the present controller through simulation.

关键词： output synchronization communication delay parallel feedforward compensator passivity

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Real-time lane detection-based line segment detection

Real-time lane detection-based line segment detection

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2018 New Generation of CAS, NGCAS 2018

作者： Mahmoud, Ahmed Ehab, Loay Reda, Mohamed Abdelaleem, Mostafa El Munim, Hossam Abd Ghoneima, Maged Darweesh, M. Saeed Mostafa, Hassan Electronics and Electrical Communications Engineering Department Faculty of Engineering Cairo University Egypt Computer and Systems Engineering Department Faculty of Engineering Ain Shams University Egypt Mechatronics Engineering Department Ain-Shams University Egypt Electronics and Communications Engineering Department Institute of Aviation Engineering and Technology Egypt Nanotechnology Department Zewail City of Science and Technology Egypt

ISBN: (纸本)9781538676813

This paper introduces a robust algorithm for real-time lane detection using the lane markers in urban streets or highway roads. It is based on applying Region of Interest (ROI) on the input image of the road from a calibrated camera in the front of the car, generating the top view of the image using Inverse Perspective Mapping (IPM), applying the core algorithm Line Segment Detection (LSD) which is followed by post-processing steps. Applying curve fitting to the line segments to get the right and left lines or curves. Finally, to get the output stream inverse IPM is applied. The proposed algorithm can detect the road lanes discriminating dashed and solid road lanes, straight and curved road lanes overcoming the shadow effect challenge with real-time performance 70 frames per second. © 2018 IEEE.

关键词： Curve fitting

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Real-Time Car Detection-Based Depth Estimation Using Mono Camera 30

Real-Time Car Detection-Based Depth Estimation Using Mono Ca...

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30th International Conference on Microelectronics, ICM 2018

作者： Elzayat, I. Mohamed Ahmed Saad, M. Mostafa, M. Mohamed Mahmoud Hassan, R. El Munim, Hossam Abd Ghoneima, Maged Darweesh, M. Saeed Mostafa, Hassan Electronics and Electrical Communications Engineering Department Faculty of Engineering Cairo University Egypt Computer and Systems Engineering Department Faculty of Engineering Ain Shams University Egypt Mechatronics Engineering Department Ain-Shams University Egypt Nanotechnology Department Zewail City of Science and Technology Egypt Electronics and Communications Engineering Department Institute of Aviation Engineering and Technology Egypt

ISBN: (纸本)9781538681671

Object depth estimation is the cornerstone of many visual analytics systems. In recent years there is a considerable progress has been made in this area, while robust, efficient, and precise depth estimation in the real-world video remains a challenge. The approach utilized in this presented paper is to estimate the distance of surrounding cars using a mono camera. Using YOLO (You Only Look Once) in the detection process, by generating a boundary box surrounding the object, then an inversion proportional correlation between the distance and the boundary box's dimensions (height, width) is ascertained. Getting the exact equation between the studied variables;the dependent variables are the distance, and independent variable is the height and width of YOLO boundary box. In the regression model, multiple regression techniques were acclimated to evade heteroskedasticity and multi-collinearity problems. Achieving a real-time detection with a 23 FPS (Frame Per Second) and depth estimation accuracy 80.4%. © 2018 IEEE.

关键词： Cameras

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Beam Squint and Channel Estimation for Wideband mmWave Massive MIMO-OFDM systems

arXiv

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arXiv 2019年

作者： Wang, Bolei Jian, Mengnan Gao, Feifei Ye Li, Geoffrey Jin, Shi Lin, Hai State Key Lab of Intelligent Technologies and Systems Tsinghua University Department of Automation Tsinghua University Beijing China School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA United States National Communications Research Laboratory Southeast University Nanjing210096 China Department of Electrical and Information Systems Graduate School of Engineering Osaka Prefecture University SakaiOsaka Japan

With the increasing scale of antenna arrays in wideband millimeter-wave (mmWave) communications, the physical propagation delays of electromagnetic waves traveling across the whole array will become large and comparable to the time-domain sample period, which is known as the spatial-wideband effect. In this case, different subcarriers in an orthogonal frequency division multiplexing (OFDM) system will "see" distinct angles of arrival (AoAs) for the same path. This effect is known as beam squint, resulting from the spatial-wideband effect, and makes the approaches based on the conventional multiple-input multiple-output (MIMO) model, such as channel estimation and precoding, inapplicable. After discussing the relationship between beam squint and the spatial-wideband effect, we propose a channel estimation scheme for frequency-division duplex (FDD) mmWave massive MIMO-OFDM systems with hybrid analog/digital precoding, which takes the beam squint effect into consideration. A super-resolution compressed sensing approach is developed to extract the frequency-insensitive parameters of each uplink channel path, i.e., the AoA and the time delay, and the frequency-sensitive parameter, i.e., the complex channel gain. With the help of the reciprocity of these frequency-insensitive parameters in FDD systems, the downlink channel estimation can be greatly simplified, where only limited pilots are needed to obtain downlink complex gains and reconstruct downlink channels. Furthermore, the uplink and downlink Copyright © 2019, The Authors. All rights reserved.

关键词： Channel estimation

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Effect of xanthan gum on physicochemical and textural properties of gluten-free batter and bread 10

Effect of xanthan gum on physicochemical and textural proper...

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10th International Conference on Simulation and Modelling in the Food and Bio-Industry, FOODSIM 2018

作者： Encina-Zelada, Christian R. Teixeira, José A. Monteiro, Fernando Gonzales-Barron, Ursula Cadavez, Vasco Centre of Biological Engineering School of Engineering University of Minho Portugal Department of Electrical Engineering School of Technology and Management INESC-TEC Institute for Systems and Computer Engineering Technology and Science Porto Portugal CIMO Mountain Research Centre School of Agriculture Polytechnic Institute of Bragança Portugal

ISBN: (纸本)9789492859013

The objective of this study was to evaluate the effect of xanthan gum (XG) on physicochemical, rheological and textural properties of gluten-free batter and bread. Batches of gluten-free bread used a base formulation of rice, corn and quinoa flour, and different levels of XG (1.5, 2.5 and 3.5%) and water content (WC;90, 100 and 110%) in a full factorial design. Although in interaction with water, higher XG doses tended to produce batters of lower stickiness, work of adhesion, strength-cohesiveness;which, when baked, produced loaves of lower specific volume and baking loss;and bread crumb of lower Aw, pH, hardness, springiness, firmness, mean cell area, void fraction, mean cell aspect ratio, and higher firmness, consistency, cohesiveness, adhesiveness, chewiness, resilience, cell density, cell size uniformity and mean cell compactness (p © 2018 EUROSIS-ETI.

关键词： Aspect ratio

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