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IEEE International Conference on Mobile Ad Hoc and Sensor Systems

作者： Scott Pudlewski Brooke Shrader Laura Herrera Nathaniel M. Jones Andrew P. Worthen Massachusetts Institute of Technology Lincoln Laboratory

ISBN: (纸本)9781467391023

This paper presents a transport layer protocol for multi-path networks with blockage. Using urban SATCOM as an example, we see from data taken from a 2006 measurement campaign that these blockages are generally on the order of 1-5 seconds in length and the links are blocked approximately 33% of the time. To compensate for this type of impairment, we have developed a multipath IP overlay routing algorithm, a random linear coding reliability scheme, and a maximum-queue-based (MQCC) congestion control algorithm. MQCC uses average buffer occupancy as a measure of the congestion in a network (as opposed to packet loss or round trip time (RTT)) and updates the transmission rate of each source to avoid network congestion. This allows us to design a congestion control algorithm that is independent of the channel conditions and can be made resilient to channel losses. The reliability scheme uses selective negative acknowledgments (SNACKs) to guarantee packet delivery to the destination. We show through simulation that we can approach the optimal benchmark in realistic lossy blockage channels.

关键词： BLOCKING computer algorithms transport layer protocol Network Congestion Queue TRANSMISSION RATE Channel loss destination Satellite communication

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Automatic Resonant Frequency Tracking in Unregulated LLC Resonant Converters Based on Total Resonant Current Harmonic Calculation

Automatic Resonant Frequency Tracking in Unregulated LLC Res...

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IEEE Energy Conversion Congress and Exposition

作者： Siyao Jiang Weimin Zhang Bo Liu Fred Wang School of Information Science and Engineering Shandong University Jinan China Department of Electrical Engineering and Computer Science The University of Tennessee Knoxville USA

ISBN: (纸本)9781479903375

The desired working condition for the unregulated LLC resonant converter is to have the switching frequency equal to the resonant frequency in order to achieve higher efficiency. However, since the converter works in open-loop condition, the switching frequency usually deviates from the resonant frequency in real converter prototype. In this paper, a novel switching frequency control scheme to track the resonant frequency is proposed. Theoretically, the primary side current of LLC resonant converter is a pure sinusoidal waveform when it works at resonant frequency. The proposed control algorithm is based on tracking the minimum value of the total resonant current harmonic to realize the switching frequency tracking the resonant frequency. A closed-loop digital controller is presented to calculate the total resonant current harmonic to estimate the shape of the waveform. The switching frequency can be well controlled to track the resonant frequency. As a result, the higher efficiency can be achieved.

关键词： resonant frequencies resonant converter Switching frequency Converters digital controller minimum value computer algorithms

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Approximation, Randomization, and Combinatorial Optimization. algorithms and Techniques 2006

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丛书名： Lecture Notes in computer Science

2006年

作者： Josep Diaz Klaus Jansen José D.P. Rolim Uri Zwick

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Live Demonstration: 3D sonar sensing using low-cost MEMS arrays

Live Demonstration: 3D sonar sensing using low-cost MEMS arr...

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IEEE Sensors Conference

作者： Robin Kerstens Jan Steckel University of Antwerp FTI CoSys Lab University of Antwerp and Flanders Make FTI CoSys Lab

ISBN: (纸本)9781509010134

In recent years, our research group has developed state of the art 3D sonar sensors [1]-[3] which use a low-cost MEMS microphone array for real-time acoustic imaging in air. Using this sensor, various robotic applications have been developed [2], including obstacle avoidance and corridor following and SLAM [1]. The developed sensor is capable of localizing an arbitrary number of reflectors, and generates 2D (range versus azimuth) or 3D (range versus azimuth and elevation) acoustic images of the environment by emitting a broadband, spatially omnidirectional acoustic emission. This emission is reflected back by the environment to the microphone array. Using array beamforming algorithms an acoustic image of the environment is created, which subsequently can be either visualized or used in various control algorithms. The overview of the developed sensor array can be seen in figure 1.

关键词： microphone arrays azimuth Sensor arrays Environments sonar Acoustic images Microelectromechanical systems Obstacle avoidance computer algorithms reflectors Corridors Sensors Acoustic equipment

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Control Algorithm of UTC(MIKE)

Control Algorithm of UTC(MIKE)

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European Frequency and Time Forum

作者： K. Kalliomaki T. Mansten I. Iisakka T. Fordell M. Merimaa Centre for Metrology and Accreditation (MIKES) P.O. Box 9 02151 Espoo Finland

The Finnish realization of coordinated universal time, designated UTC(MIKE), is derived from a single active hydrogen maser at the Centre for Metrology and Accreditation (MIKES). The frequency of a hydrogen maser typically drifts with time, leading to an approximately parabolic phase shift. At MIKES, a programmable delay generator is used to negate the phase drift of the maser. An improved control algorithm for the phase compensation has lead to a ten-fold improvement in time stability compared to our previous results. With time-transfer based on precise point positioning, we have been able to keep UTC(MIKE) within ±6 ns of UTC during the past year even though our only link to primary frequency standards is through the *** and Circular T. Moreover, improved predictability has lowered the time deviation (TDEV) of UTC(MIKE) to a level below 500 ps when data from the past 10 months is considered.

关键词： computer algorithms hydrogen masers phase compensation time bias primary frequency standard precise point positioning time stability urban traffic control system metrology Phase shift coordinated Universal Time Centre (France)

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Robot vision test raises its sights

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NEW SCIENTIST 2017年第3121期234卷 16-16页

作者： Reynolds, Matt

The article discusses the new test for robot vision to see in 3D mode enhancing the scope for image-recognition algorithms. It discusses how the algorithms have been trained to recognize and categorize objects under different categories. It also reveals that building a full-proof image database complete with 3D information will facilitate the robots to identify the objects in a better way.

关键词： ROBOT vision IMAGE recognition (computer vision) 3-D animation OBJECT recognition (computer vision) IMAGE databases computer algorithms

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Kinematics of Three-Fingered Dexterous Hands Driven by Pneumatic Artificial Muscle Based on Vector Product Method

Kinematics of Three-Fingered Dexterous Hands Driven by Pneum...

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IEEE International Conference of Intelligent Robotic and Control Engineering (IRCE)

作者： Ze Zhu Bo Fang College of aeronautics and astronautics Shenyang Aerospace University Shenyang China

ISBN: (数字)9781728141923

ISBN: (纸本)9781728141930

For decades, many countries have developed a variety of multifingered dexterous hands. However, most of the multi-finger-fingers that have come out at present aim to achieve high dexterity, with a large number of joints, a very complex structure, high degree of freedom, tedious control algorithm and high cost, which is unrealistic for practical application. Therefore, this paper designed an artificial muscle-driven[1] three-finger dexterous hand, which has good flexibility[2], very light quality, large input-output ratio, low manufacturing cost, can complete complex grasping and operating tasks, high dexterity advantages.

关键词： dexterous hands pneumatic artificial muscle kinematics joint driving force kinematics Dextrous hands Degree of freedom Hand Cross product dexterity Pneumatic computer algorithms

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A Fractional Order Maximum Power Point Tracker: Stability Analysis and Experiments

A Fractional Order Maximum Power Point Tracker: Stability An...

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IEEE Annual Conference on Decision and Control

作者： Hadi Malek Sara Dadras YangQuan Chen Utah State Research Foundation (USURP) CSOIS ECE Department Utah State University Dep. of Electrical and Computer Engineering Department Director of CSOIS Utah State University

ISBN: (纸本)9781467320658

This paper presents a fractional order extremum seeking control scheme for maximum power point tracking tasks to better accommodate rapid varying solar irradiance for photovoltaic (PV) arrays. The stability analysis of the proposed control algorithm is presented first. Then the new algorithm is benchmarked against the integer order extremum seeking control. Our extensive simulation and experimental results show that, our proposed maximum power point tracker has faster convergence speed in comparison with integer order one.

关键词： maximum power point trackers computer algorithms Stability analysis fractional order Maximum power extremum values photovoltaic array Integer

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Observers And Predictors For Wireless Time-Sensitive Control Loops

Observers And Predictors For Wireless Time-Sensitive Control...

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： Linda Patricia Osuna Ibarra David Gomez Gutierrez Dave Cavalcanti Humberto Caballero Barragan Intel Guadalajara Mexico Intel Hillsboro Oregon USA

ISBN: (数字)9781728152974

ISBN: (纸本)9781728152981

The present work deals with diminishing the effects of wireless communication latency in time-sensitive networks. It takes advantage of modern approaches that offer bounded latency and it focuses on methods to cope with the nondeterministic delays introduced by communication *** observer-predictor scheme module is designed and added in the control loop to prevent the performance degradation when a wireless network is introduced. The goal is to allow the use of same controllers used in wired networks. This module may exploit information provided by the wireless communication devices, such as expected latency, timestamp, and time synchronization along the *** proposed module allows the controller to have a performance similar as when in a wired network. This enables wireless networked control in systems with low time constants (i.e. timesensitive).Lab experiments are presented in real-time to illustrate the observer-predictor scheme module proposed. Finally, the conclusions and future work are presented.

关键词： industrial control wireless time sensitive networking (WTSN) control algorithms wireless control loops. industrial control computer algorithms control ring Observers Wireless networks degradation of performance Radio communication equipment wired network clock recovery Controllers Latency wireless CARRIER SYSTEM

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The Contribution of Glucagon in an Artificial Pancreas for People with Type 1 Diabetes

The Contribution of Glucagon in an Artificial Pancreas for P...

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American Control Conference

作者： Vladimir Batora Marian Tarnik Jan Murgas Signe Schmidt Kirsten Norgaard Niels Kjostad Poulsen Henrik Madsen Dimitri Boiroux John Bagterp Jorgensen Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava Slovak Republic Department of Endocrinology Hvidovre Hospital Denmark Department of Applied Mathematics and Computer Science Technical University of Denmark Kgs. Lyngby Denmark

ISBN: (纸本)9781479917730

The risk of hypoglycemia is one of the main concerns in treatment of type 1 diabetes (T1D). In this paper we present a head-to-head comparison of a currently used insulin-only controller and a prospective bihormonal controller for blood glucose in people with T1D. The bihormonal strategy uses insulin to treat hyperglycemia as well as glucagon to ensure fast recovery from hypoglycemic episodes. Two separate model predictive controllers (MPC) based on patient-specific models handle insulin and glucagon infusion. In addition, the control algorithm consists of a Kalman filter and a meal time insulin bolus calculator. The feedback is obtained from a continuous glucose monitor (CGM). We implement a bihormonal simulation model with time-varying parameters available for 3 subjects to compare the strategies. We consider a protocol with 3 events - a correct mealtime insulin bolus, a missed bolus and a bolus overestimated by 60%. During normal operation both strategies provide similar results. The contribution of glucagon becomes evident after administration of the overestimated insulin bolus. In a 10h period following an overbolused meal, the bihormonal strategy reduces time spent in hypoglycemia in the most severe case by almost 15% (1.5h), outperforming the insulin-only control. Therefore, glucagon contributes to the safety of an Artificial Pancreas.

关键词： Artificial Pancreas Type 1 Diabetes Mellitus Insulin Insulins Hypoglycemia Kalman filters normal operation Persons computer algorithms

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