The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform
Lakmal D. Seneviratne - One of the best experts on this subject based on the ideXlab platform.
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A sensor guided autonomous parking system for nonholonomic mobile robots
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999Co-Authors: K. Jiang, Lakmal D. SeneviratneAbstract:An automated parallel parking strategy for a car-like mobile robot is presented. The study considers general cases of parallel parking for a rectangular robot within a rectangular space. The system works in three Phases. In Scanning Phase, the parking environment is detected by ultrasonic sensors mounted on the robot and a parking position and manoeuvring path is produced if the space is sufficient. Then in the positioning Phase, the robot reverses to the edge of the parking space avoiding potential collisions. Finally, in manoeuvring Phase, the robot moves to the parking position in the parking space in a unified pattern, which may requires backward and forward manoeuvres depending on the dimensions of the parking space. Motion characteristics of this kind of robots are modeled, taking into account the nonholonomic constraints acting on the car-like robot. A collision-free path is planned in reference to the surroundings. The strategy has been integrated into an automated parking system, and implemented in a modified B12 mobile robot, showing capable of safe parking in tight situations.
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A parallel parking system for a car-like robot with sensor guidance
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 1999Co-Authors: K. Jiang, David Z Zhang, Lakmal D. SeneviratneAbstract:AbstractAn automated parallel parking strategy for a car-like mobile robot is presented. The study considers general cases of parallel parking for a rectangular robot within a rectangular space. The system works in three Phases. In Scanning Phase the parking environment is detected by ultrasonic sensors mounted on the robot and a parking position and manoeuvring path is produced if the space is sufficient. Then in the positioning Phase the robot reverses to the edge of the parking space, avoiding potential collisions. Finally, in manoeuvring Phase the robot moves to the parking position in the parking space in a unified pattern, which may require backward and forward manoeuvres depending on the dimensions of the parking space. Motion characteristics of this kind of robot are modelled, taking into account the non-holonomic constraints acting on the car-like robot. On the basis of the characteristics, a collision-free path is planned in reference to the surroundings. The strategy has been integrated into an...
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ICRA - A sensor guided autonomous parking system for nonholonomic mobile robots
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999Co-Authors: K. Jiang, Lakmal D. SeneviratneAbstract:An automated parallel parking strategy for a car-like mobile robot is presented. The study considers general cases of parallel parking for a rectangular robot within a rectangular space. The system works in three Phases. In Scanning Phase, the parking environment is detected by ultrasonic sensors mounted on the robot and a parking position and manoeuvring path is produced if the space is sufficient. Then in the positioning Phase, the robot reverses to the edge of the parking space avoiding potential collisions. Finally, in manoeuvring Phase, the robot moves to the parking position in the parking space in a unified pattern, which may requires backward and forward manoeuvres depending on the dimensions of the parking space. Motion characteristics of this kind of robots are modeled, taking into account the nonholonomic constraints acting on the car-like robot. A collision-free path is planned in reference to the surroundings. The strategy has been integrated into an automated parking system, and implemented in a modified B12 mobile robot, showing capable of safe parking in tight situations.
Ernst Brinkmeyer - One of the best experts on this subject based on the ideXlab platform.
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Scanning Phase-Mask DUV Inscription of Short-Period Large-Area Photoresist Gratings
Journal of Lightwave Technology, 2011Co-Authors: Jens Huster, Jost Muller, Hagen Renner, Ernst BrinkmeyerAbstract:We present an approach for periodical structuring of large-area photoresist gratings with short periods based on a deep-ultraviolet (DUV) lithography process. Our procedure of inscribing gratings on planar surfaces using a Scanning Phase-mask interferometer and including a technique for suppressing the disturbing influence of the zeroth-order diffraction is demonstrated and compared to well-established methods. Applying this approach, large-area, centimeter-scale chirped photoresist gratings with a central period of 225 nm, a chirp rate of 0.5 nm/cm and a duty cycle of 50% have been fabricated on planar silicon chips.
K. Jiang - One of the best experts on this subject based on the ideXlab platform.
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A sensor guided autonomous parking system for nonholonomic mobile robots
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999Co-Authors: K. Jiang, Lakmal D. SeneviratneAbstract:An automated parallel parking strategy for a car-like mobile robot is presented. The study considers general cases of parallel parking for a rectangular robot within a rectangular space. The system works in three Phases. In Scanning Phase, the parking environment is detected by ultrasonic sensors mounted on the robot and a parking position and manoeuvring path is produced if the space is sufficient. Then in the positioning Phase, the robot reverses to the edge of the parking space avoiding potential collisions. Finally, in manoeuvring Phase, the robot moves to the parking position in the parking space in a unified pattern, which may requires backward and forward manoeuvres depending on the dimensions of the parking space. Motion characteristics of this kind of robots are modeled, taking into account the nonholonomic constraints acting on the car-like robot. A collision-free path is planned in reference to the surroundings. The strategy has been integrated into an automated parking system, and implemented in a modified B12 mobile robot, showing capable of safe parking in tight situations.
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A parallel parking system for a car-like robot with sensor guidance
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 1999Co-Authors: K. Jiang, David Z Zhang, Lakmal D. SeneviratneAbstract:AbstractAn automated parallel parking strategy for a car-like mobile robot is presented. The study considers general cases of parallel parking for a rectangular robot within a rectangular space. The system works in three Phases. In Scanning Phase the parking environment is detected by ultrasonic sensors mounted on the robot and a parking position and manoeuvring path is produced if the space is sufficient. Then in the positioning Phase the robot reverses to the edge of the parking space, avoiding potential collisions. Finally, in manoeuvring Phase the robot moves to the parking position in the parking space in a unified pattern, which may require backward and forward manoeuvres depending on the dimensions of the parking space. Motion characteristics of this kind of robot are modelled, taking into account the non-holonomic constraints acting on the car-like robot. On the basis of the characteristics, a collision-free path is planned in reference to the surroundings. The strategy has been integrated into an...
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ICRA - A sensor guided autonomous parking system for nonholonomic mobile robots
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999Co-Authors: K. Jiang, Lakmal D. SeneviratneAbstract:An automated parallel parking strategy for a car-like mobile robot is presented. The study considers general cases of parallel parking for a rectangular robot within a rectangular space. The system works in three Phases. In Scanning Phase, the parking environment is detected by ultrasonic sensors mounted on the robot and a parking position and manoeuvring path is produced if the space is sufficient. Then in the positioning Phase, the robot reverses to the edge of the parking space avoiding potential collisions. Finally, in manoeuvring Phase, the robot moves to the parking position in the parking space in a unified pattern, which may requires backward and forward manoeuvres depending on the dimensions of the parking space. Motion characteristics of this kind of robots are modeled, taking into account the nonholonomic constraints acting on the car-like robot. A collision-free path is planned in reference to the surroundings. The strategy has been integrated into an automated parking system, and implemented in a modified B12 mobile robot, showing capable of safe parking in tight situations.
Ahmed A. Kishk - One of the best experts on this subject based on the ideXlab platform.
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Compact Low-Cost Phased Array of Dielectric Resonator Antenna Using Parasitic Elements and Capacitor Loading
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Mohammad Ranjbar Nikkhah, J. Rashed-mohassel, Ahmed A. KishkAbstract:A three elements compact low-cost Phased array of rectangular dielectric resonator antenna (RDRA) is presented. The Scanning Phase is based on using mutual coupling and capacitor loading. The center DRA is made of high dielectric constant, εr=35.9 and fed by a microstrip line. The two parasitic dielectric resonators (DRs) are electromagnetically coupled to the driven element. The dielectric constant and dimensions of the parasitic element are quite similar to the driven dielectric resonator. The Phase shift between elements is adjustable by changing the reactive loading on the parasitic DRs. The reactive loadings are two small capacitors inserted between the microstrip lines and ground plane. The scan coverage of the Phased array antenna is ±30 degrees at 2.8 GHz. Across the entire scan angle range, the array return loss is less than 10 dB across a bandwidth of 130 MHz.
William F. Turri - One of the best experts on this subject based on the ideXlab platform.
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High-throughput CAVLC architecture for real-time H.264 coding using reconfigurable devices
Journal of Real-Time Image Processing, 2016Co-Authors: Marc P. Hoffman, Eric J. Balster, William F. TurriAbstract:One of the encoding methods offered by H.264 AVC is context-based adaptive variable length coding (CAVLC). This paper presents a high-throughput hardware implementation of the CAVLC encoder. A dual-coefficient Scanning Phase is investigated and modified to improve the speed of the encoding Phase. This improved Scanning solution determines all the required data for the encoding Phase to be completed in a minimized and constant number of clock cycles. In addition, an algorithmic approach for encoding levels is exploited to reduce hardware resource requirements. The modified Scanning Phase approach offers significant throughput capabilities for CAVLC: at 200 MHz, the architecture is capable of encoding 1,080 p video files at 95 fps.
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A high throughput architecture for the H.264/AVC CAVLC encoder
2012 19th International Conference on Systems Signals and Image Processing (IWSSIP), 2012Co-Authors: Marc P. Hoffman, Eric J. Balster, William F. TurriAbstract:One of the encoding methods offered by H.264/AVC is context-based adaptive variable length coding (CAVLC). This paper presents a high throughput hardware implementation of the CAVLC encoder. A dual coefficient Scanning Phase is investigated and modified to improve the speed of the encoding Phase. This improved Scanning solution determines all the required data for the encoding Phase to be completed in a minimized and constant number of clock cycles. The modified Scanning Phase approach offers significant throughput capabilities for CAVLC: At 200 MHz, the architecture is capable of encoding 1080p video files at 86 fps.
