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2013 IEEE Congress on Evolutionary Computation, CEC 2013

作者： Cruz, Davila Patricia Ferreira Maia, Renato Dourado Szabo, Alexandre De Castro, Leandro Nunes Educational Foundation of Montes Claros Montes Claros MG Brazil Computer Sciences Department State University of Montes Claros Montes Claros MG Brazil Graduate Program in Electrical Engineering Mackenzie University São Paulo Brazil

ISBN: (纸本)9781479904549

The amount of data generated in different knowledge areas has made it necessary the use of data mining tools capable of automatically analyzing and extracting knowledge from datasets. Clustering is one of the most important tasks in data mining and can be defined as the process of partitioning objects into groups or clusters, such that objects in the same group are more similar to one another than to objects belonging to other groups. In this context, this paper aims to propose an adaptation of a bee-inspired optimization algorithm so that it is able to solve data clustering problems. The algorithm was run for different datasets and the results obtained showed high quality clusters and diversity of solutions, whilst a suitable number of clusters was automatically determined. © 2013 IEEE.

关键词： Swarm intelligence

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Comparison of morphological properties of different types of coarse aggregates

Comparison of morphological properties of different types of...

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2013 Airfield and Highway Pavement Conference: Sustainable and Efficient Pavements

作者： Singh, Dharamveer Zaman, Musharraf Commuri, Sesh Bombay Powai Mumbai 400076 India Research and Graduate Program College of Engineering University of Oklahoma 202 W. Boyd St. Norman OK 73019 United States School of Electrical and Computer Engineering University of Oklahoma Norman OK 73019 United States

ISBN: (纸本)9780784413005

The present study was undertaken to compare angularity, texture, and flat and elongated (F&E) particles of three different types (namely, granite, rhyolite, and limestone) of coarse aggregates. An aggregate-imaging system (AIMS) manufactured by Pine Instruments Inc., was used to measure the shape parameters of the aggregates. Comparison of shape parameters was performed by plotting the distribution of different types of angular particles (i.e., rounded, sub-rounded, sub-angular, and angular);texture particles (i.e., polished, smooth, low, medium, and high roughness);and F&E particles (maximum to minimum dimension ratio = 5:1 and 3:1). In addition, analysis of variance (ANOVA) was conducted to compare the mean of the shape parameters. Results show that no significant difference exists in angularity of different types of aggregates. However, texture was found to be significantly different for the three types of aggregates considered in this study. It was observed that the granite aggregates have the highest texture followed by the limestone and the rhyolite aggregates. The study indicates that aggregates can have same angularity but can differ significantly in texture. The distribution of F&E particles shows that three aggregates had less than 10% and 20% of particles with maximum to minimum dimension ratios 5:1 and 3:1, respectively. It is expected that present study will be helpful in understanding the shape parameters for different types of aggregates. © 2013 American Society of Civil Engineers.

关键词： Aggregates

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Power quality control of wind-diesel hybrid power systems using fuzzy PI controller

Power quality control of wind-diesel hybrid power systems us...

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2012 3rd International Conference on Manufacturing Science and Technology, ICMST 2012

作者： Yang, Su-Hyung Kim, Ho-Chan Boo, Chang-Jin Kang, Min-Jae Kim, Eel-Hwan Ko, Hee-Sang Lee, Kwang Y. Multidisciplinary Graduate School Program for Wind Energy Jeju National University Korea Republic of Department of Electrical Engineering Jeju National University Korea Republic of Department of Electronic Engineering Jeju National University Korea Republic of Product Development Team/Wind Turbine Division Samsung Heavy Industries Co Korea Republic of Department of Electrical and Computer Engineering Baylor University United States

ISBN: (纸本)9783037855638

This paper proposes a modeling and controller design approach for a wind-diesel hybrid system including dump load. The proposed control scheme for power quality is fuzzy PI controller which has advantages of PI and fuzzy controller. Simulation results show that the proposed controller is more effective against disturbances caused by wind speed and load variation than the PI controller, and thus it contributes to a better quality wind-diesel hybrid power system. © (2013) Trans Tech Publications, Switzerland.

关键词： Controllers

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Deformation of porous, nanostructured silver at room temperature and 150C°

Deformation of porous, nanostructured silver at room tempera...

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2012 MRS Fall Meeting

作者： Noiseau, Guillaume Becker, Michael F. Keto, John W. Kovar, Desiderio Materials Science and Engineering Graduate Program University of Texas at Austin Austin TX 78712-1591 United States Department of Electrical and Computer Engineering University of Texas Austin TX United States Department of Physics University of Texas Austin TX United States Department of Mechanical Engineering University of Texas Austin TX United States

ISBN: (纸本)9781632661067

Porous, nanostructured silver samples were produced using a direct-write method where a nanoparticle aerosol consisting of particles with a mean size of approximately 5 nm were accelerated to speeds of approximately 1000 m/sec and impacted onto a translating substrate [1]. The impacting particles have sufficient energy to stick to the substrate, allowing patterned thick films to be directly written from the aerosol without a mask. Unlike other low temperature processing routes for achieving patterned films, no organics are added that can interfere with post-deposition processing. Typical films are 5-100 μm thick, up to several centimeters long, and have an as-deposited relative densities as high as 70% of bulk Ag. Compression tests were carried out in steps at room temperature and at 150°C under constant displacement rates. Local strain and densification were measured by optical profilometry between each compression step. The results can be used as a starting point to better understand the mechanisms that govern plasticity, creep, and sintering in nanostructured, porous silver at low processing temperatures. © 2013 Materials Research Society.

关键词： Room temperature

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Vibration Characterization Using Gaussian Laser Beam

Vibration Characterization Using Gaussian Laser Beam

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International Conference on Modeling, Simulation and Applied Optimization

作者： Naveed A. Abbasi Taha Landolsi Rached Dhaouadi Graduate Program of Mechatronics Engineering American University of Sharjah Department of Computer Engineering American University of Sharjah Department of Electrical Engineering American University of Sharjah

ISBN: (纸本)9781467358125

The objective of this research is to present a neural network based optical vibration sensor using a quad-cell photo-detector array. The proposed system uses a He-Ne laser source whose Gaussian beam impinges on the photo-detector array. The optical power distribution from the photo-detectors is fed to vibration monitoring system which maps the power distribution to the x-y position of the laser beam center. The vibration monitoring system uses artificial neural networks for function approximation to yield the correct mapping and estimate the x-y positions of the laser beam center which are then used for vibration characterization. An experimental setup of the system is developed and then trained using neural networks. The results obtained show the effectiveness of neural networks to estimate the vibration frequency and magnitude of a vibrating system.

关键词： Vibration monitoring Neural network Optical sensor Quad-cell photo detector array

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Simplifying complexity: Modeling the process of collaboration between artists and scientists 13

Simplifying complexity: Modeling the process of collaboratio...

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31st ACM International Conference on Design of Communication, SIGDOC 2013

作者： McDougall, Zoe Fels, Sidney Lopes, Dominic O'Brien, Heather L. Interdisciplinary Studies Graduate Program University of British Columbia Vancouver BC Canada Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada Department of Philosophy University of British Columbia Vancouver BC Canada The iSchool University of British Columbia Vancouver BC Canada

ISBN: (纸本)9781450321310

This paper presents a modal model to describe and facilitate communication design in collaborative settings. This model was conceived of as a tool for understanding the nature of collaboration between artists and scientists in an interdisciplinary case study, but can be used cross-disciplinarily and ultimately prescriptively. The model may reveal shifting patterns of interaction between collaborators over time and through multiple processes. Patterns may be revealed in setting and attaining benchmark goals as well as in general group communication. Different collaborative modes (ontological relationships between collaborators) and modes of being (phenomenological relationship between collaborators) form the basis for sixty collaborative possibilities with two or more collaborators. © 2013 ACM.

关键词： communication collaboration models charles s. peirce

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Analysis of Needle-Tissue Friction during Vibration-Assisted Needle Insertion

Analysis of Needle-Tissue Friction during Vibration-Assisted...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Iman Khalaji Mostafa Hadavand Ali Asadian Rajni V. Patel Michael D. Naish Canadian Surgical Technologies and Advanced Robotics (CSTAR) Lawson Health Research Institute London Canada Biomedical Engineering Graduate Program Western University Department of Electrical and Computer Engineering Western University Department of Electrical and Computer Engineering and the Department of Surgery Western University Department of Mechanical and Materials Engineering and the Department of Electrical and Computer Engineering Western University

ISBN: (纸本)9781467363563

In this paper, a vibration-assisted needle insertion technique has been proposed in order to reduce needle-tissue friction. The LuGre friction model was employed as a basis for the current study and the model was extended and analyzed to include the impact of high-frequency vibration on translational friction. Experiments were conducted to evaluate the role of insertion speed as well as vibration frequency on frictional effects. In the experiments conducted, an 18 GA brachytherapy needle was vibrated and inserted into an ex-vivo soft tissue sample using a pair of amplified piezoelectric actuators. Analysis demonstrates that the translational friction can be reduced by introducing a vibratory low-amplitude motion onto a regular insertion profile, which is usually performed at a constant rate.

关键词： friction high frequency vibration LuGre friction Vibrational frequencies Insertion Mutation Pairing

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Evaluating geographic topological vulnerabilities

Evaluating geographic topological vulnerabilities

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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Xuelian Long David Tipper Teresa Gomes Graduate Telecommunications and Networking Program University of Pittsburgh Pittsburgh PA Department of Electrical and Computer Engineering University of Coimbra / INESC Coimbra Coimbra Portugal

Measuring the survivability of core backbone communication networks to geographic correlated failures is important in network analysis and design. Different measures of network survivability have been used in the literature, for example, Algebraic Connectivity, Network Criticality, Average Shortest Path, Network Diameter, Node Degree and Node Strength. This paper proposes a new performance measure Weighted Spectrum to evaluate network survivability regarding geographic correlated failures. Further we conduct a comparative analysis by finding the most vulnerable geographic cuts or nodes in the network though solving an optimization problem to determine the cut with the largest impact for each measure. Numerical results on several sample network topologies show that the worst-case geographic cuts depend on the measure used in an unweighted graph. The proposed Weighted Spectrum measure is shown to be more versatile than other measures in unweighted and weighted graphs.

关键词： Network topology Topology Weight measurement Laplace equations Conferences Reliability engineering

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Deformation of Porous, Nanostructured Silver at Room Temperature and 150 °C

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MRS Online Proceedings Library 2013年第1期1513卷 1-6页

作者： Noiseau, Guillaume Becker, Michael F. Keto, John W. Kovar, Desiderio Materials Science and Engineering Graduate Program The University of Texas at Austin Austin USA Department of Electrical and Computer Engineering The University of Texas Austin USA Department of Physics The University of Texas Austin USA Department of Mechanical Engineering The University of Texas Austin USA

Porous, nanostructured silver samples were produced using a direct-write method where a nanoparticle aerosol consisting of particles with a mean size of approximately 5 nm were accelerated to speeds of approximately 1000 m/sec and impacted onto a translating substrate [1]. The impacting particles have sufficient energy to stick to the substrate, allowing patterned thick films to be directly written from the aerosol without a mask. Unlike other low temperature processing routes for achieving patterned films, no organics are added that can interfere with postdeposition processing. Typical films are 5- 100 μm thick, up to several centimeters long, and have an as-deposited relative densities as high as 70% of bulk Ag. Compression tests were carried out in steps at room temperature and at 150°C under constant displacement rates. Local strain and densification were measured by optical profilometry between each compression step. The results can be used as a starting point to better understand the mechanisms that govern plasticity, creep, and sintering in nanostructured, porous silver at low processing temperatures.

关键词： Ag densification nanoscale

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Three-phase shunt active power filter based on the interconnection of single-phase and three-phase converters

Three-phase shunt active power filter based on the interconn...

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Brazilian Power Electronics Conference, COBEP

作者： A. M. Maciel C. B. Jacobina V. B. Melo E. C. dos Santos E. L. L. Fabrício Instituto Federal da Paraíba PB Brazil Electrical Engineering Department (DEE) Federal University of Camnina Grande (UFCG) Camnina Grande PB Brazil Post-Graduate Program in Electrical Engineering-PPgEE-COPELE Department of Electrical and Computer Engineering IUPUI

This paper presents a topology based on the interconnection of single-phase H-bridge converters and a three-phase converter acting as a shunt active power filter. Contributions for the model, PWM approach and control strategies are presented to the studied converter. As compared to the conventional solution by using just H-bridges converters, the proposed one reduces the number of semiconductor and storage devices while keeping the same characteristics of high number of levels. A comprehensive THD analysis will be considered followed by simulated and experimental outcomes.

关键词： Control systems Topology Capacitors Voltage control Shunts (electrical) Pulse width modulation Integrated circuit interconnections

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