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arXiv 2020年

作者： Hao, Wanming Sun, Gangcan Zhou, Fuhui Mi, De Shi, Jia Xiao, Pei Leung, Victor C.M. School of Information Engineering Zhengzhou University Zhengzhou450001 China 5G Innovation Center Institute of Communication Systems University of Surrey GuildfordGU2 7XH United Kingdom 5G Innovation Center Institute of Communication Systems University of Surrey GuildfordGU2 7XH United Kingdom College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing210000 China State Key Laboratory of Integrated Services Networks Xi'dian University Xian710071 China College of Computer Science and Software Engineering Shenzhen University Shenzhen518060 China Department of Electrical and Computer Engineering University of British Columbia VancouverBCV6T1Z4 Canada

In this paper, we investigate the energy-efficient hybrid precoding design for integrated multicast-unicast millimeter wave (mmWave) system, where the simultaneous wireless information and power transform is considered at receivers. We adopt two sparse radio frequency chain antenna structures at the base station (BS), i.e., fully-connected and subarray structures, and design the codebook-based analog precoding according to the different structures. Then, we formulate a joint digital multicast, unicast precoding and power splitting ratio optimization problem to maximize the energy efficiency of the system, while the maximum transmit power at the BS and minimum harvested energy at receivers are considered. Due to its difficulty to directly solve the formulated problem, we equivalently transform the fractional objective function into a subtractive form one and propose a two-loop iterative algorithm to solve it. For the outer loop, the classic Bi-section iterative algorithm is applied. For the inner loop, we transform the formulated problem into a convex one by successive convex approximation techniques and propose an iterative algorithm to solve it. Meanwhile, to reduce the complexity of the inner loop, we develop a zero forcing (ZF) technique-based low complexity iterative algorithm. Specifically, the ZF technique is applied to cancel the inter-unicast interference and the first order Taylor approximation is used for the convexification of the non-convex constraints in the original problem. Finally, simulation results are provided to compare the performance of the proposed algorithms under different schemes. Copyright © 2020, The Authors. All rights reserved.

关键词： Energy efficiency

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A steady-state and transient analysis of the electron transport that occurs within bulk wurtzite zinc-magnesium-oxide alloys subjected to high-fields

A steady-state and transient analysis of the electron transp...

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MRS Advances

作者： Siddiqua, Poppy Hadi, Walid A. Shur, Michael S. O'Leary, Stephen K. School of Engineering University of British Columbia KelownaBCV1V 1V7 Canada Department of Electrical and Computer Engineering Florida State University Panama CityFL32405 United States Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180-3590 United States

We present some recently acquired results corresponding to the nature of the electron transport that occurs within bulk alloys of zinc-magnesium-oxide. These results are obtained using three-valley ensemble semi-classical Monte Carlo electron transport simulations. The impact that the magnesium content plays in shaping the form of the electron transport related characteristics associated with this alloy system is explored. Both steady-state and transient electron transport results are examined. The device implications of these results are then commented upon. © 2018 Materials Research Society.

关键词： Transient analysis

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Helical Nanostructures: Broadband Enhanced Chirality with Tunable Response in Hybrid Plasmonic Helical Metamaterials (Adv. Funct. Mater. 20/2021)

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Advanced Functional Materials 2021年第20期31卷

作者： Ufuk Kilic Matthew Hilfiker Alexander Ruder Rene Feder Eva Schubert Mathias Schubert Christos Argyropoulos Department of Electrical and Computer Engineering University of Nebraska-Lincoln Lincoln NE 68588 USA Optical Materials and Technologies Fraunhofer Institute for Microstructure of Materials and Systems (IMWS) D-06120 Halle (Saale) Germany Department of Physics Chemistry and Biology Linkoping University Linkoping 58183 Sweden Institute of Physical Chemistry and Polymer Physics Leibniz Institute for Polymer Research D-01005 Dresden Germany

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The Future of Fighter Pilot Training? Live Virtual Constructive in Large Force Exercises: Perceived and Expected Training Value

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The International Journal of Aviation Psychology 2024年第1期34卷

作者： Rogier Woltjer Robert Ramberg Henrik Artman Sanna Aronsson Mikael Mitchell Per-Anders Oskarsson a Swedish Air Force Combat Simulation Center FLSC Swedish Defence Research Agency FOI Stockholm Sweden a Swedish Air Force Combat Simulation Center FLSC Swedish Defence Research Agency FOI Stockholm Swedenb Department of Computer and Systems Sciences Faculty of Social Sciences Stockholm University Stockholm Sweden a Swedish Air Force Combat Simulation Center FLSC Swedish Defence Research Agency FOI Stockholm Swedenc Division of Media Technology and Interaction Design School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm Sweden a Swedish Air Force Combat Simulation Center FLSC Swedish Defence Research Agency FOI Stockholm Swedend 221 Sqn Swedish Air Force Luleå Sweden e Department of Man-Technology-Organisation Swedish Defence Research Agency FOI Linköping Sweden

ABSTRACTObjectiveThis study investigates whether and how perceived training value varies among fighter pilots participating in a large force exercise (LFE), and whether they expect Live Virtual Constructive (LVC) training to enhance training value of future *** technology is maturing but its expected training value is under-investigated, especially regarding future LVC in *** pilots at a Live-flying LFE answered questionnaires, 120 responses were analyzed statistically. The questions focused on whether the sortie they just flew provided training value, generally and for specific Desired Learning Objectives (DLOs), on whether the inclusion of Virtual and Constructive entities in future LFEs would contribute to training value generally and to the DLOs specifically, and on specific LVC implementation *** of experienced training value varied across DLOs, and DLO ratings varied across Mission types. Fighter pilots were positive toward including Virtual and Constructive entities in LFEs for certain DLOs, mostly for flying a complex mission. DLOs covaried around the factors of LVC-tradeoff advantages and Live advantages, as well as temporal dimensions of planning before a mission and stages of engagement. LVC implementation lessons were *** pilots are generally moderately positive about LVC in LFEs. The measurement of perceived training value per DLO seems a relevant instrument for investigating perceived training value of an LFE and expected training value of future LVC training.

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Retraction notice to “A Carbon-Sensitive Two-Echelon-Inventory Supply Chain Model with Stochastic Demand: A Genetic Algorithm Approach”

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Resources, Conservation and Recycling 2020年 163卷

作者： Malek Abu Alhaj Davor Svetinovic Ali Diabat Department of Engineering Systems and Management Masdar Institute of Science & Technology Abu Dhabi United Arab Emirates Department of Electrical Engineering and Computer Science Masdar Institute of Science & Technology Abu Dhabi United Arab Emirates

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Skeleton model based behavior recognition for pedestrians and cyclists from vehicle sce ne camera

Skeleton model based behavior recognition for pedestrians an...

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2018 IEEE Intelligent Vehicles Symposium, IV 2018

作者： Deng, Qiwen Tian, Renran Chen, Yaobin Li, Kang Transportation Active Safety Institute Department of Electrical and Computer Engineering Indiana University Purdue University Indianapolis IndianapolisIN46202 United States Department of Industrial and Systems Engineering School of Engineering Rutgers University New BrunswickNJ08901 United States

ISBN: (纸本)9781538644522

With the significant advances in computer vision research, skeleton model based human pose recognition has become more accurate and time-efficient, although most of the applications are limited in laboratory environment or on surveillance videos. This paper proposes a pose tracking and behavior recognition method from in-vehicle scene camera. It will not only detect pedestrians on the road, but also generate their skeleton models describing head, limb, and trunk movements. Based on these more detailed movements of body parts, the proposed method is designed to track poses of pedestrians and cyclists with the potentials to enable automated pedestrian gesture reading and non-verbal interactions between autonomous vehicles and pedestrians. The proposed algorithm has been tested on different databases including TASI 110-car naturalistic driving database and Joint Attention for Autonomous Driving (JAAD) database. Results show that key frames describing different pedestrian and cyclist negotiation gestures are detected from the raw video streams using the proposed method. These results will improve our understanding of pedestrian and cyclist's intentions and can be further used for autonomous vehicle control algorithm development. © 2018 IEEE.

关键词： Cameras

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Surface conduction and electroosmotic flow around charged dielectric pillar arrays in microchannels

arXiv

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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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