2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
Secondary power supplies (SPS) are DC-DC converters embedded within electronic systems used to co... more Secondary power supplies (SPS) are DC-DC converters embedded within electronic systems used to convert DC electricity at one voltage into regulated DC electricity at a second voltage. They operate downstream of an electronic device's primary AC-DC power supply and are employed to develop the diverse array of voltages required by the complex electronic systems on the printed circuit board. Little
ABSTRACT A novel hybrid approach for supervisory control was applied to a test cell with thermo-a... more ABSTRACT A novel hybrid approach for supervisory control was applied to a test cell with thermo-active building systems and fan-assisted natural ventilation. Model predictive control was first used to identify combined thermo-active building systems and ventilation control strategies that maximized cooling energy savings while preserving thermal comfort. A rule extraction process using classification and regression trees then yielded supervisory rules capable of reproducing nearly all of the energy and comfort benefits of the model predictive control solutions when simulated. An experimental test of the rules was conducted on the same facility, yielding 40% average cooling energy savings compared to a base case, with comparable comfort. A variety of model input mismatches, including weather, model parameters, internal gains, and imperfect weather forecasts, degraded the performance of the rule significantly under experimental conditions, and analysis suggests that energy savings could have been nearly double had these factors been eliminated.
Journal of Manufacturing Science and Engineering, 2004
Nickel and nickel-alloy microparts sized on the order of 51000 microns have been imaged in three... more Nickel and nickel-alloy microparts sized on the order of 51000 microns have been imaged in three dimensions using a new microscopic technique, Digital Volumetric Imaging (DVI). The gears were fabricated using Sandia National Laboratories' LIGA technology (lithography, ...
Rule extraction is a promising technique for developing or fine-tuning supervisory control strate... more Rule extraction is a promising technique for developing or fine-tuning supervisory control strategies in buildings. Three data mining techniques are examined that extract rules from offline model predictive control (MPC) results for a mixed mode building operated during the cooling season: generalized linear models (GLM), classification and regression trees (CART), and adaptive boosting. All rules were able to recover approximately
Proceedings of the 2005 IEEE International Symposium on Electronics and the Environment, 2005., 2005
This paper examines the energy consumption of desktop computers and desktop-derived servers, as w... more This paper examines the energy consumption of desktop computers and desktop-derived servers, as well as the barriers to getting more efficient power supplies in these devices. It follows with a discussion on an electric-utility funded program called 80 plus, which is designed to overcome these obstacles.
2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
Secondary power supplies (SPS) are DC-DC converters embedded within electronic systems used to co... more Secondary power supplies (SPS) are DC-DC converters embedded within electronic systems used to convert DC electricity at one voltage into regulated DC electricity at a second voltage. They operate downstream of an electronic device's primary AC-DC power supply and are employed to develop the diverse array of voltages required by the complex electronic systems on the printed circuit board. Little
ABSTRACT A novel hybrid approach for supervisory control was applied to a test cell with thermo-a... more ABSTRACT A novel hybrid approach for supervisory control was applied to a test cell with thermo-active building systems and fan-assisted natural ventilation. Model predictive control was first used to identify combined thermo-active building systems and ventilation control strategies that maximized cooling energy savings while preserving thermal comfort. A rule extraction process using classification and regression trees then yielded supervisory rules capable of reproducing nearly all of the energy and comfort benefits of the model predictive control solutions when simulated. An experimental test of the rules was conducted on the same facility, yielding 40% average cooling energy savings compared to a base case, with comparable comfort. A variety of model input mismatches, including weather, model parameters, internal gains, and imperfect weather forecasts, degraded the performance of the rule significantly under experimental conditions, and analysis suggests that energy savings could have been nearly double had these factors been eliminated.
Journal of Manufacturing Science and Engineering, 2004
Nickel and nickel-alloy microparts sized on the order of 51000 microns have been imaged in three... more Nickel and nickel-alloy microparts sized on the order of 51000 microns have been imaged in three dimensions using a new microscopic technique, Digital Volumetric Imaging (DVI). The gears were fabricated using Sandia National Laboratories' LIGA technology (lithography, ...
Rule extraction is a promising technique for developing or fine-tuning supervisory control strate... more Rule extraction is a promising technique for developing or fine-tuning supervisory control strategies in buildings. Three data mining techniques are examined that extract rules from offline model predictive control (MPC) results for a mixed mode building operated during the cooling season: generalized linear models (GLM), classification and regression trees (CART), and adaptive boosting. All rules were able to recover approximately
Proceedings of the 2005 IEEE International Symposium on Electronics and the Environment, 2005., 2005
This paper examines the energy consumption of desktop computers and desktop-derived servers, as w... more This paper examines the energy consumption of desktop computers and desktop-derived servers, as well as the barriers to getting more efficient power supplies in these devices. It follows with a discussion on an electric-utility funded program called 80 plus, which is designed to overcome these obstacles.
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