The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Richard M. Voyles - One of the best experts on this subject based on the ideXlab platform.
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IROS - Real-time software module design framework for building self-adaptive robotic systems
2015 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2015Co-Authors: Joshua T. Lane, Richard M. VoylesAbstract:We proposed ReFrESH in our previous publication. It is a self-adaptive infrastructure aimed at managing the performance of multi-robot systems through dynamically diagnosing and maintaining unexpected issues of modules. To integrate ReFrESH and robotic application-level software more conveniently, it is necessary to develop a module design framework to support implementation of self-adaptive real-time software. To this end, based on the port-based object abstraction and port-automation theory, we propose the Extended Port-Based Object (E-PBO). E-PBO has two main advantages: (1) it builds the basis of a programming model to provide specific, yet flexible, guidelines to robotics application engineers for creating and integrating software modules; (2) it forms the basis of a self-adaption model to provide specific methods for evaluating the Running task Configuration and estimating the new but non-Running task Configuration (if required) without interfering with the Running Configuration. E-PBO has been incorporated into the Port-Based Object Real-Time Operating System (PBO/RT) and applied to a visual servoing robotic application, which is demonstrated here.
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Real-time software module design framework for building self-adaptive robotic systems
2015 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2015Co-Authors: Joshua T. Lane, Richard M. VoylesAbstract:We proposed ReFrESH in our previous publication. It is a self-adaptive infrastructure aimed at managing the performance of multi-robot systems through dynamically diagnosing and maintaining unexpected issues of modules. To integrate ReFrESH and robotic application-level software more conveniently, it is necessary to develop a module design framework to support implementation of self-adaptive real-time software. To this end, based on the port-based object abstraction and port-automation theory, we propose the Extended Port-Based Object (E-PBO). E-PBO has two main advantages: (1) it builds the basis of a programming model to provide specific, yet flexible, guidelines to robotics application engineers for creating and integrating software modules; (2) it forms the basis of a self-adaption model to provide specific methods for evaluating the Running task Configuration and estimating the new but non-Running task Configuration (if required) without interfering with the Running Configuration. E-PBO has been incorporated into the Port-Based Object Real-Time Operating System (PBO/RT) and applied to a visual servoing robotic application, which is demonstrated here.
Joshua T. Lane - One of the best experts on this subject based on the ideXlab platform.
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IROS - Real-time software module design framework for building self-adaptive robotic systems
2015 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2015Co-Authors: Joshua T. Lane, Richard M. VoylesAbstract:We proposed ReFrESH in our previous publication. It is a self-adaptive infrastructure aimed at managing the performance of multi-robot systems through dynamically diagnosing and maintaining unexpected issues of modules. To integrate ReFrESH and robotic application-level software more conveniently, it is necessary to develop a module design framework to support implementation of self-adaptive real-time software. To this end, based on the port-based object abstraction and port-automation theory, we propose the Extended Port-Based Object (E-PBO). E-PBO has two main advantages: (1) it builds the basis of a programming model to provide specific, yet flexible, guidelines to robotics application engineers for creating and integrating software modules; (2) it forms the basis of a self-adaption model to provide specific methods for evaluating the Running task Configuration and estimating the new but non-Running task Configuration (if required) without interfering with the Running Configuration. E-PBO has been incorporated into the Port-Based Object Real-Time Operating System (PBO/RT) and applied to a visual servoing robotic application, which is demonstrated here.
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Real-time software module design framework for building self-adaptive robotic systems
2015 IEEE RSJ International Conference on Intelligent Robots and Systems (IROS), 2015Co-Authors: Joshua T. Lane, Richard M. VoylesAbstract:We proposed ReFrESH in our previous publication. It is a self-adaptive infrastructure aimed at managing the performance of multi-robot systems through dynamically diagnosing and maintaining unexpected issues of modules. To integrate ReFrESH and robotic application-level software more conveniently, it is necessary to develop a module design framework to support implementation of self-adaptive real-time software. To this end, based on the port-based object abstraction and port-automation theory, we propose the Extended Port-Based Object (E-PBO). E-PBO has two main advantages: (1) it builds the basis of a programming model to provide specific, yet flexible, guidelines to robotics application engineers for creating and integrating software modules; (2) it forms the basis of a self-adaption model to provide specific methods for evaluating the Running task Configuration and estimating the new but non-Running task Configuration (if required) without interfering with the Running Configuration. E-PBO has been incorporated into the Port-Based Object Real-Time Operating System (PBO/RT) and applied to a visual servoing robotic application, which is demonstrated here.
Christopher D. Marshall - One of the best experts on this subject based on the ideXlab platform.
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umped Ytterbium- 4)3F Laser Performance
1996Co-Authors: Christopher D. Marshall, Larry K. Smith, R. J. Beach, Mark A. Emanuel, Kathleen I. Schaffers, Jay A. Skidmore, S. A. Payne, H. T. ChaiAbstract:The performance of the first diode-pumped Yh3+- doped Srs(PO&F (Yb:S-FAP) solid-state laser is discussed. An InGaAs diode array has been fabricated that has suitable spec- ifications for pumping a 3 x 3 x 30 mm Yb:S-FAP rod. The saturation fluence for diode pumping was deduced to be 5.5 J/cmz for the particular 2.8 kW peak power diode array utilized in our studies. This is 2.5~ higher than the intrinsic 2.2 J/cm2 saturation fluence as is attributed to the 6.5 nm bandwidth of our diode pump array. The small signal gain is consistent with the previously measured emission cross section of 6.0 x lo-" em2, obtained from a narrowband-laser pumped gain experiment. Up to 1.7 J/cm3 of stored energy density was achieved in a 6 x 6 x 44 mm Yb:S-FAP amplifier rod. In a free Running Configuration, diode-pumped slope efficiencies up to 43% (laser output energylabsorbed pump energy) were observed with output energies up to -0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 ps pulses.
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Diode-pumped ytterbium-doped Sr/sub 5/(PO/sub 4/)/sub 3/F laser performance
IEEE Journal of Quantum Electronics, 1996Co-Authors: Christopher D. Marshall, Larry K. Smith, R. J. Beach, Mark A. Emanuel, Kathleen I. Schaffers, Jay A. Skidmore, S. A. Payne, Bruce H. T. ChaiAbstract:The performance of the first diode-pumped Yb/sup 3+/-doped Sr/sub 5/(PO/sub 4/)/sub 3/F (Yb:S-FAP) solid-state laser is discussed. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3/spl times/3/spl times/30 mm Yb:S-FAP rod. The saturation fluence for diode pumping was deduced to be 5.5 J/cm/sup 2/ for the particular 2.8 kW peak power diode array utilized in our studies. This is 2.5/spl times/ higher than the intrinsic 2.2 J/cm/sup 2/ saturation fluence as is attributed to the 6.5 nm bandwidth of our diode pump array. The small signal gain is consistent with the previously measured emission cross section of 6.0/spl times/10/sup -20/ cm/sup 2/, obtained from a narrowband-laser pumped gain experiment. Up to 1.7 J/cm/sup 3/ of stored energy density was achieved in a 6/spl times/6/spl times/44 mm Yb:S-FAP amplifier rod. In a free Running Configuration, diode-pumped slope efficiencies up to 43% (laser output energy/absorbed pump energy) were observed with output energies up to /spl sim/0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 /spl mu/s pulses.
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Diode-pumped solid-state laser driver experiments for inertial fusion energy applications
Solid State Lasers for Application to Inertial Confinement Fusion (ICF), 1995Co-Authors: Christopher D. Marshall, Larry K. Smith, Mark A. Emanuel, S. A. Payne, Howard T. Powell, William F. KrupkeAbstract:Although solid-state lasers have been the primary means by which the physics of inertial confinement fusion (ICF) have been investigated, it was previously thought that solid-state laser technology could not offer adequate efficiencies for an inertial fusion energy (IFE) power plant. Orth and co-workers have recently designed a conceptual IFE power plant, however, with a high efficiency diode-pumped solid-state laser (DPSSL) driver that utilized several recent innovations in laser technology. It was concluded that DPSSLs could offer adequate performance for IFE with reasonable assumptions. This system was based on a novel diode pumped Yb-doped Sr{sub 5}(PO{sub 4}){sub 3}F (Yb:S-FAP) amplifier. Because this is a relatively new gain medium, a project was established to experimentally validate the diode-pumping and extraction dynamics of this system at the smallest reasonable scale. This paper reports on the initial experimental results of this study. We found the pumping dynamics and extraction cross-sections of Yb:S-FAP crystals to be similar to those previously inferred by purely spectroscopic techniques. The saturation fluence for pumping was measured to be 2.2 J/cm{sup 2} using three different methods based on either the spatial, temporal, or energy transmission properties of a Yb:S-FAP rod. The small signal gain implies an emission cross section of 6.0{times}10{sup {minus}20} cm{sup 2}. Up to 1.7 J/cm{sup 3} of stored energy density was achieved in a 6{times}6{times}44 mm{sup 3} Yb:S-FAP amplifier rod. In a free Running Configuration diode-pumped slope efficiencies up to 43% were observed with output energies up to {approximately}0.5 J per 1 ms pulse from a 3{times}3{times}30 mm{sup 3} rod. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 {mu}s pulses.
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Diode-pumped Yb:Sr{sub 5}(PO{sub 4}){sub 3}F laser performance
1995Co-Authors: Christopher D. Marshall, S. A. Payne, Larry K. SmithAbstract:The performance of the first diode-pumped Yb{sup 3+}-doped Sr{sub 5}(PO{sub 4}){sub 3}F (Yb:S-FAP) laser is discussed. We found the pumping dynamics and extraction cross-sections of Yb:S-FAP crystals to be similar to those previously inferred by purely spectroscopic techniques. The saturation fluence for pumping was measured to be 2.2 J/cm{sup 2} using three different methods based on either the spatial, temporal, or energy transmission properties of a Yb:S-FAP rod. The small signal gain implies an emission cross section of 6.0 x 10{sup -20} cm{sup 2} that falls within error bars of the previously reported value of 7.3 x 10{sup -20} cm{sup 2}, obtained from spectroscopic techniques. Up to 1.7 J/cm{sup 3} of stored energy density was achieved in a 6 x 6 x 44 mm Yb:S-FAP amplifier rod. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3 x 3 x 30 mm Yb:S-FAP rod. In a free Running Configuration diode-pumped slope efficiencies up to 43% were observed with output energies up to {approximately}0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz and 500 {mu}s pulses.
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Diode-Pumped Yb:Sr5(PO4)3F Laser Performance
1995Co-Authors: Christopher D. Marshall, Larry K. Smith, R. J. Beach, Mark A. Emanuel, Jay A. Skidmore, S. A. Payne, Howard T. Powell, William F. Krupke, Bruce H. T. ChaiAbstract:The performance of the first diode-pumped Yb3+-doped Sr5(PO4)3F (Yb:S-FAP) laser is discussed. We found the pumping dynamics and extraction cross-sections of Yb:S-FAP crystals to be similar to those previously inferred by purely spectroscopic techniques. The saturation fluence for pumping was measured to be 2.2 J/cm2 using three different methods based on either the spatial, temporal, or energy transmission properties of a Yb:S-FAP rod. The small signal gain implies an emission cross section of 6.0×10−20 cm2 that falls within error bars of the previously reported value of 7.3×10−20 cm2, obtained from spectroscopic techniques. Up to 1.7 J/cm3 of stored energy density was achieved in a 6×6×44 mm Yb:S-FAP amplifier rod. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3×3×30 mm Yb:S-FAP rod. In a free Running Configuration diode-pumped slope efficiencies up to 43% were observed with output energies up to ~0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz and 500 μs pulses.
Bruce H. T. Chai - One of the best experts on this subject based on the ideXlab platform.
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Diode-pumped ytterbium-doped Sr/sub 5/(PO/sub 4/)/sub 3/F laser performance
IEEE Journal of Quantum Electronics, 1996Co-Authors: Christopher D. Marshall, Larry K. Smith, R. J. Beach, Mark A. Emanuel, Kathleen I. Schaffers, Jay A. Skidmore, S. A. Payne, Bruce H. T. ChaiAbstract:The performance of the first diode-pumped Yb/sup 3+/-doped Sr/sub 5/(PO/sub 4/)/sub 3/F (Yb:S-FAP) solid-state laser is discussed. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3/spl times/3/spl times/30 mm Yb:S-FAP rod. The saturation fluence for diode pumping was deduced to be 5.5 J/cm/sup 2/ for the particular 2.8 kW peak power diode array utilized in our studies. This is 2.5/spl times/ higher than the intrinsic 2.2 J/cm/sup 2/ saturation fluence as is attributed to the 6.5 nm bandwidth of our diode pump array. The small signal gain is consistent with the previously measured emission cross section of 6.0/spl times/10/sup -20/ cm/sup 2/, obtained from a narrowband-laser pumped gain experiment. Up to 1.7 J/cm/sup 3/ of stored energy density was achieved in a 6/spl times/6/spl times/44 mm Yb:S-FAP amplifier rod. In a free Running Configuration, diode-pumped slope efficiencies up to 43% (laser output energy/absorbed pump energy) were observed with output energies up to /spl sim/0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 /spl mu/s pulses.
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Diode-Pumped Yb:Sr5(PO4)3F Laser Performance
1995Co-Authors: Christopher D. Marshall, Larry K. Smith, R. J. Beach, Mark A. Emanuel, Jay A. Skidmore, S. A. Payne, Howard T. Powell, William F. Krupke, Bruce H. T. ChaiAbstract:The performance of the first diode-pumped Yb3+-doped Sr5(PO4)3F (Yb:S-FAP) laser is discussed. We found the pumping dynamics and extraction cross-sections of Yb:S-FAP crystals to be similar to those previously inferred by purely spectroscopic techniques. The saturation fluence for pumping was measured to be 2.2 J/cm2 using three different methods based on either the spatial, temporal, or energy transmission properties of a Yb:S-FAP rod. The small signal gain implies an emission cross section of 6.0×10−20 cm2 that falls within error bars of the previously reported value of 7.3×10−20 cm2, obtained from spectroscopic techniques. Up to 1.7 J/cm3 of stored energy density was achieved in a 6×6×44 mm Yb:S-FAP amplifier rod. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3×3×30 mm Yb:S-FAP rod. In a free Running Configuration diode-pumped slope efficiencies up to 43% were observed with output energies up to ~0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz and 500 μs pulses.
Sandra Jerez - One of the best experts on this subject based on the ideXlab platform.
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IPDPS - Optimizing the execution of a parallel meteorology simulation code
2009 IEEE International Symposium on Parallel & Distributed Processing, 2009Co-Authors: Sandra Jerez, J. P. Montávez, Domingo GiménezAbstract:Climate simulations are very computational time consuming tasks which are usually solved in parallel systems. However, to reduce the time needed for the simulations, a set of parameters must be optimally selected. This paper presents a methodology to select such parameters for a particular simulation code (the MM5 mesoescalar model). When the code is installed in a computational system its behaviour when executing the code is characterized by a set of parameters. The values obtained are included in a model of the execution time of the code, and the simulation is carried out at Running time with the Running Configuration with which the lowest theoretical time is obtained. An important reduction in the execution time is achieved. In the experiments the reduction is between 25% and 40%. The methodology proposed could be applied to other problems in which the code to be optimized is considered as a black box.
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Optimizing the execution of a parallel meteorology simulation code
Parallel & Distributed Processing, 2009. IPDPS 2009. IEEE International Symposium on, 2009Co-Authors: Sandra Jerez, J. P. Montávez, David GimenezAbstract:Climate simulations are very computational time consuming tasks which are usually solved in parallel systems. However, to reduce the time needed for the simulations, a set of parameters must be optimally selected. This paper presents a methodology to select such parameters for a particular simulation code (the MM5 mesoescalar model). When the code is installed in a computational system its behaviour when executing the code is characterized by a set of parameters. The values obtained are included in a model of the execution time of the code, and the simulation is carried out at Running time with the Running Configuration with which the lowest theoretical time is obtained. An important reduction in the execution time is achieved. In the experiments the reduction is between 25% and 40%. The methodology proposed could be applied to other problems in which the code to be optimized is considered as a black box.
