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检索条件"主题词=computer algorithms"

共 3274 条记录，以下是821-830 订阅

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Measurement System for Ground Reaction Forces in Skid-Steering Mobile Platform Rex 20

Measurement System for Ground Reaction Forces in Skid-Steeri...

引用

20th International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Szrek, Jaroslaw Arent, Krzysztof Wroclaw Univ Technol Dept Biomed Engn Mechatron & Theory Mech Wybrzeze Wyspianskiego 27 PL-50320 Wroclaw Poland Wroclaw Univ Technol Chair Cybernet & Robot Elect Fac PL-50320 Wroclaw Poland

ISBN: (纸本)9781479987016

The article is focused on a measurement system for ground reaction forces in a skid-steering mobile platform. The information derived by such a system is useful for several model based control algorithms which in turn are the base for requirements of a measurement system. The system, that meets the requirements, is proposed and initially discussed. Presentation of a system concept is complemented by initial experimental results.

关键词： measurement system rex computer algorithms Mobile Force Platform ground

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Adaptive Power Control algorithms in Underwater Wireless Optical CDMA Cellular Networks 4

Adaptive Power Control Algorithms in Underwater Wireless Opt...

引用

4th International Workshop on Optical Wireless Communications (IWOW)

作者： BaniHassan, Navid Akhoundi, Farhad Salehi, Jawad A. Tarbiat Modares Univ Dept Elect & Comp Engn Tehran Iran Sharif Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781467377263

In this paper we introduce two adaptive power control algorithms for downlink of underwater wireless optical cellular networks. The first approach is based on the angle of user's position with respect to optical base transceiver station (OBTS) of the cell. The second scheme works according to the link distance between the user and the OBTS. Defining an optimization problem, we aim to guaranty the quality of service for each user while minimizing the transmitting power. In our methods, we utilize limited feedback channel state information (CSI) so that the algorithm could be implemented with low complexity. The simulation results for different water types demonstrate that our proposed algorithms outperform the non-adaptive scheme.

关键词： computer algorithms adaptive power control Water types Transmitter power Cellular networks Underwater Consumers OCDMA Quality of service wireless algorithms base transceiver station

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Security-aware Service Migration for Tactical Mobile Micro-Clouds 34

Security-aware Service Migration for Tactical Mobile Micro-C...

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34th IEEE Annual Military Communications Conference (MILCOM) on Leveraging Technology - The Joint Imperative

作者： Ciftcioglu, Ertugrul N. Chan, Kevin S. Urgaonkar, Rahul Wang, Shiqiang He, Ting IBM Res Yorktown Hts NY USA US Army Res Lab Adelphi MD USA Univ London Imperial Coll Sci Technol & Med London England

ISBN: (纸本)9781509000739

Mobile micro-clouds (MMCs), which are small cloud-like infrastructures that can host services for mobile users, provide a promising approach to deliver data and computation to users in low bandwidth/high latency networks. In this work, we take a step towards security-aware service migration for multiple servers for MMC in tactical environments. As a fundamental model, we consider two users sharing a cluster of MMCs and moving between coverage areas of different MMCs according to random walk. We formulate the problem using a finite horizon Markov Decision Process (MDP). Due to the coupling between users due to security (and possibly interference) costs, we observe that the problem is significantly more complex compared with the non-security-aware single user service migration problem studied in the literature, even in the simplest case of two users. Accordingly, we consider efficient control algorithms which aim to minimize time average costs. Particularly, we propose a modified myopic policy which aims to reduce time average costs by steering operation towards settings which would reduce the likelihood of future security cost increases, by proactively keeping the services distant. Our numerical results demonstrate that our modified myopic policy outperforms other policies in terms of average cost for various settings.

关键词： Cloud computing Cost function Couplings Mobile communication Security Servers Yttrium Servers Couplings mobile communication Cost functions METAL MATRIX COMPOSITES Rare earths yttrium Cloud Computing Consumers Security average time computer algorithms AREA COVERAGE coupling basic model

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Trajectory Tracking Control of a Vehicle with a Large Sideslip Angle

Trajectory Tracking Control of a Vehicle with a Large Sidesl...

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IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

作者： Nakano, Hiroshi Kinugawa, Jun Kosuge, Kazuhiro Tohoku Univ Grad Sch Engn Dept Bioengn & Robot Sendai Miyagi 9808579 Japan

ISBN: (纸本)9781467391078

We propose a trajectory tracking control algorithm for a vehicle with a large sideslip angle. The proposed algorithm was designed on the basis of a vehicle's planar motion using a four-wheel vehicle model. The proposed algorithm controls the vehicle's position and attitude by integrating the motion control algorithm for a vehicle with a large sideslip angle into the trajectory tracking algorithm for a mobile robot. The proposed algorithm was implemented into an experimental system and the results verify its effectiveness.

关键词： vehicle SIDESLIP trajectory tracking tracking control Vehicle model computer algorithms Angle

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Automation Control algorithms in Gas Mixture for Preterm Infant Oxygen Therapy 2

Automation Control Algorithms in Gas Mixture for Preterm Inf...

引用

IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW 2015)

作者： Chanyagom, Pomchai Kiratiwudhikul, Phattaradanai Mahidol Univ Dept Elect Engn Salaya 73170 Nakhon Pathom Thailand

ISBN: (纸本)9781479987450

Pre-term infants often suffered from immature lung development, which caused oxygen saturation (SpO(2)) to be fewer than 90% (98-100% for normal infants). Oxygen therapy was an essential treatment supply right proportional air-oxygen gas content called a fractional of inspired oxygen (FiO(2)) via nasal cannula to control SpO(2) in a range of 90-95% and to maintain life. Registered nurses (RN) were routinely responsible for adjusting FiO(2) between 21-100% according to a current SpO(2) and a doctor's order. The objective was to supply FiO(2) as low as possible while maintaining SpO(2) in a suitable range. However, manual adjustments were not in real time (normal every 20-30 minutes) which could introduce risk of either oxygen toxicity from too high SpO(2) or hypoxia from too low SpO(2). This research was to develop an automatically control of FiO(2) according to an order SpO(2) by medical doctors. The result of this research could reduce risk of blindness from oxygen toxicity as well as mortality from hypoxia in pre-term infants. The system also allowed medical doctors to use recorded data for future care plan in oxygen therapy. This research introduced two different algorithms for such purposes and described a design of such system.

关键词： gas mixture Premature Infant oxygen toxicity computer algorithms Hypoxia Oxygen Inhalation Therapy Blindness Patient Care Planning Infant Otolaryngologists Lung Development term infant GAS CONTENT

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An Adaptive Control Algorithm for Wind Power Dispatch Using a Battery Energy Storage System

An Adaptive Control Algorithm for Wind Power Dispatch Using ...

引用

IEEE Conference on Control and Applications (CCA)

作者： Khalid, Muhammad Savkin, Andrey V. Agelidis, Vassilios G. Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

ISBN: (纸本)9781479977871

This paper presents an adaptive wind power selling strategy to increase the income for grid-connected wind power plant attached with a battery energy storage system (BESS). The proposed selling strategy is primarily based on time varying price thresholds that are varied by our proposed adaptive algorithm. Since electricity market prices and wind power vary throughout the day, the idea is to store energy during low price-periods and sell it when prices are high. The wind farm operator could take advantage of the price variability in order to generate an extra income by choosing the best price thresholds in an adaptive manner. Twofold benefits of the proposed strategy lie in efficient energy selling along with the constraint-based efficient operation of BESS. The strategy has been analyzed for a variety of BESSs with a wide range of its energy and power capacities, and income improvement over a trivial strategy is calculated. Simulation results depict the effectiveness of the proposed strategy validated with real-world wind farm data and electricity market prices.

关键词： adaptive control battery storage plants power grids power markets time-varying systems wind power plants BESS adaptive control algorithm adaptive wind power selling strategy battery energy storage system electricity market prices grid-connected wind power plant time varying price thresholds wind power dispatch Batteries Electricity supply industry Renewable energy sources Wind farms Wind power generation battery energy storage system Wind farms Wind power plants power markets electricity supply industry Power grids adaptive control time-varying systems Wind energy generation Renewable energy renewable energy sources Batteries computer algorithms Prices Wind energy

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Towards Optical Wireless Communications between Micro Unmanned Aerial and Ground Systems

Towards Optical Wireless Communications between Micro Unmann...

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International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Cruz, Patricio J. Fierro, Rafael Univ New Mexico Dept Elect & Comp Engn Albuquerque NM 87131 USA

ISBN: (纸本)9781479960101

A group of unmanned vehicles can provide essential support to human task forces in a variety of missions, like in search and rescue operations. A crucial factor for task coordination is to maintain a reliable connectivity among the autonomous platforms. Radio-frequency is the common technology adopted for unmanned systems to operate wirelessly. However, this technology has some limitations that can be mitigated by complementing it with optical wireless communications. In this paper, we propose the implementation of an optical wireless link between micro-scale unmanned systems: an aerial vehicle and a ground mobile robot. We describe a line-of-sight directed optical link between these platforms where the flying vehicle carries an optical transmitter while the mobile ground robot is equipped with an optical receiver. This light-based communication link requires to keep an adequate relative transmitter-receiver position to enhance the transmission rate. Therefore, we define a connectivity cone on top of the receiver such that if the transmitter stays inside of this cone a minimum bit rate can be guaranteed. Also, we propose a control algorithm for the aerial transmitter to get and stay within the connectivity cone. The performance of the control algorithm is demonstrated through numerical simulations.

关键词： computer algorithms CARRIER SYSTEM Optical wireless unmanned systems task coordinate Optical transmitters Optical links Communication Research Telecommunication links Rescue Mobile robots ANTENNA Platform

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Internet Congestion Control 1

引用

丛书名： computer Science

2015年

作者： Subir Varma

ISBN: (数字)9780128036006;0128036001

ISBN: (纸本)9780128035832

Internet Congestion Control provides a description of some of the most important topics in the area of congestion control in computer networks, with special emphasis on the analytical modeling of congestion control algorithms. The field of congestion control has seen many notable advances in recent years and the purpose of this book, which is targeted towards the advanced and intermediate reader, is to inform about the most important developments in this area. The book should enable the reader to gain a good understanding of the application of congestion control theory to a number of application domains such as Data Center Networks, Video Streaming, High Speed Links and Broadband Wireless Networks. When seen through the lens of analytical modeling, there are a number of common threads that run through the design and analysis of congestion control protocols in all these different areas, which are emphasized in this book. The book also cuts a path through the profusion of algorithms in the literature, and puts the topic on a systematic and logical footing. Internet Congestion Control provides practicing network engineers and researchers with a comprehensive and accessible coverage of analytical models of congestion control algorithms, and gives readers everything needed to understand the latest developments and research in this area.

关键词： Internet TCP/IP (computer network protocol) computer algorithms

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Optimal Planning for Target Localization and Coverage Using Range Sensing 11

Optimal Planning for Target Localization and Coverage Using ...

引用

IEEE International Conference on Automation Science and Engineering (CASE)

作者： Miller, Lauren M. Murphey, Todd D. Northwestern Univ Dept Mech Engn RR McCormick Sch Engn & Appl Sci Evanston IL 60208 USA

ISBN: (纸本)9781467381833

This paper presents an algorithm for autonomously calculating active sensing strategies applied to range sensing. The receding-horizon algorithm we use, called Ergodic Exploration of Distributed Information (EEDI), involves two major components: a) calculation of an expected information density map over the search space based on prior information and a model of the sensor, and b) ergodic trajectory optimization over the sensor configuration space with respect to that information map. The ergodic control algorithm does not rely on discretization of the search or action spaces, and is well-posed for coverage with respect to the expected information density whether the information is diffuse or localized. We simulate successful localization and discrimination of targets in a two-dimensional workspace using a fixed-location range sensor under various noise levels, and compare performance to an information maximizing strategy.

关键词： Coverage Noise levels Targets computer algorithms Sensors Discretization range sensor

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A Distributed Deployment Algorithm for Mobile Robotic Agents with Limited Sensing/Communication Ranges

A Distributed Deployment Algorithm for Mobile Robotic Agents...

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IEEE INTERNATIONAL CONFERENCE ON ELECTRO/INFORMATION TECHNOLOGY (EIT)

作者： Wang, Jing Smith, Christopher Staskevich, Gennady Abbe, Brian Bradley Univ Fac Elect & Comp Engn Peoria IL 61625 USA Bradley Univ Dept Elect & Comp Engn Peoria IL 61625 USA AFRL RISC Rome NY 13441 USA

ISBN: (纸本)9781479988020

In this paper, we propose a distributed deployment algorithm for a group of mobile robots to cover a convex region. The individual mobile robot considered has kinematic constraints, and may only exchange information locally with its neighboring counterparts due to its limited sensing/communication range. The proposed deployment algorithm iteratively updates the Voronoi partition through local information exchange, and then moves toward its centroid based on centroid-drive control algorithms. Particularly, in addition to gradient-based centroid-drive control algorithm in which input-output linearization has been applied to robot model, a new algorithm based on distributed consensus is proposed to directly address the kinematic constraint associated with robot model. Simulation results are provided to illustrate the effectiveness of the proposed algorithm.

关键词： deployment Mobile robots computer algorithms Distribute information exchange Centroid algorithms Mobile agents kinematics Robot

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