Given a finite set of points S ⊆ R2, we define a proximity graph called as shape-hull graph (SHG(S)) that contains all Gabriel edges and a few non-Gabriel edges of Delaunay triangulation of S. For any S, SHG(S) is top...
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Traditionally, electric power plant capacities are determined after specific plant locations have been selected. Tn recent times the focus in the design of photovoltaic (PV) systems has been shifting to ones that oper...
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Traditionally, electric power plant capacities are determined after specific plant locations have been selected. Tn recent times the focus in the design of photovoltaic (PV) systems has been shifting to ones that operate in conjunction with electric grids. In this paper, a generation expansion problem involving the choice of locations and plant capacities over a specified planning horizon (years) is tackled. The problem is formulated as a mixed integer programming model and solved using a modified embedded Benders decomposition method. The model and the algorithm developed in this paper are used to solve a renewable energy system design problem in Ghana.
This report presents a technique of chaotification based on the optimal time-delay feedback that can make a system chaotic with large chaotic parameters range. The bifurcation analysis is done to determine the stabili...
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Development of an ecological interface design (EID) for addressing social problem of gambling is presented. Although physiology of gambling addiction cannot be influenced by EID but it is a promising step in improving...
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Development of an ecological interface design (EID) for addressing social problem of gambling is presented. Although physiology of gambling addiction cannot be influenced by EID but it is a promising step in improving decision making processess of gamblers. Different project visualizations and evaluation of the design are also presented.
Although advances in computing power have greatly improved computer chess playing, human chess players still rival their computer counter-parts. Computer algorithms typically use a strategy of exhaustive search, which...
Although advances in computing power have greatly improved computer chess playing, human chess players still rival their computer counter-parts. Computer algorithms typically use a strategy of exhaustive search, which is unlikely to be used by human players. We hypothesized that human chess players recognize higher order properties of the game and use these properties to limit their need for exhaustive move searching. We used graph theoretic modeling to quantitatively determine three possible higher order properties. We then conducted an experiment by using the higher order properties to preselect moves for a typical exhaustive search chess engine. We played the enhanced chess engine against its unenhanced version in six games. The enhanced version won all six games, regardless of color played, suggesting that pre-selection of moves based on higher order properties of the game is indeed a viable strategy.
In designing large ecological displays, designers are faced with the question of how to display multiple levels of abstract information. Previous research has shown that people may perform better, in terms of diagnosi...
In designing large ecological displays, designers are faced with the question of how to display multiple levels of abstract information. Previous research has shown that people may perform better, in terms of diagnosis speed and accuracy, if multiple levels of information are presented in an integrated format (Burns, 2000). We repeated the study of Burns (2000) which looks at providing abstract information in three formats - one level at a time, windowed and integrated. We collected eye tracking data at intervals throughout the experiment. Our eye-tracker was able to collect pupil diameter measures and changes. Results showed no notable difference in pupil diameter measures between the integrated condition and the one level at a time condition, but notably higher increases in pupil diameter when abstract information was in separate windows. Furthermore, pupil diameters increased over time in the windowed condition, suggesting that workload with this display may have been increasing. These preliminary data suggest that separating levels of abstract information may increase the mental workload of operators.
Distributions of electromagnetic fields and induced forced flow inside a metal melt are crucial to understand the grain refinement of the metal driven by pulsed magneto-oscillation(PMO).In the present study,PMO-induce...
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Distributions of electromagnetic fields and induced forced flow inside a metal melt are crucial to understand the grain refinement of the metal driven by pulsed magneto-oscillation(PMO).In the present study,PMO-induced electromagnetic fields and forced flow in Ga-20 wt%In-12 wt%Sn liquid metal have been systematically investigated by performing numerical simulations and corresponding experimental *** numerical simulations have been confirmed by magnetic and melt flow *** to the simulated distribution of electromagnetic fields under the application of PMO,the strongest magnetic field,electric eddy current and Lorentz force with inward radial direction inside the melt are concentrated adjacent the sidewall of cylindrical melt at the cross section of middle height of *** a result,a global forced flow throughout the whole cylindrical column filled with Ga-20 wt%In-12 wt%Snmelt is initiated with a flow structure of two pair of symmetric *** PMO-induced electromagnetic fields and forced flow in Al-7 wt%Si melt have been numerically *** contribution of electromagnetic fields and forced flow to the grain refinement of Al-7 wt%Sialloy under the application of PMO is *** indicates that the forced flow may play a key role in the grain size reduction.
Data quality is an important and costly topic in modern society, and data quality and contextual data quality are important components of the human-computer relationship. As a long-term design imperative, the user int...
Data quality is an important and costly topic in modern society, and data quality and contextual data quality are important components of the human-computer relationship. As a long-term design imperative, the user interface needs to be improved to support better data quality. To design for better data quality, this exploratory study characterizes physicians’ opinions on their own data and the data produced by their colleagues. Through a regional survey and semi-structured interviews, the issue of data style and medical record personality was a dominant theme. A record’s personality impacts an individual user’s willingness to accept the data it contains. Future work will incorporate these results into modeling the data quality problem with cognitive work analysis, and will explore design elements to support the design for better data quality.
In the present work,Fe–Mn–Al–C powder mixtures were manufactured by elemental powders with different ball milling time,and the porous high-Mn and high-Al steel was fabricated by powder *** results indicated that th...
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In the present work,Fe–Mn–Al–C powder mixtures were manufactured by elemental powders with different ball milling time,and the porous high-Mn and high-Al steel was fabricated by powder *** results indicated that the powder size significantly decreased,and the morphology of the Fe powder tended to be increasingly flat as the milling time ***,the prolonged milling duration had limited impact on the phase transition of the powder *** main phases of all the samples sintered at 640℃ were α-Fe,α-Mn and Al,and a small amount of Fe2Al5 and *** the sintering temperature increased to 1200℃,the phase composition was mainly comprised of γ-Fe and α-*** weight loss fraction of the sintered sample decreased with milling time,i.e.,8.3wt% after 20 h milling compared to15.3wt% for 10 *** Mn depletion region(MDR) for the 10,15,and 20 h milled samples was about 780,600,and 370 μm,*** total porosity of samples sintered at 640℃ decreased from ~46.6vol% for the 10 h milled powder to ~44.2vol% for 20 h milled *** sintering at 1200℃,the total porosity of sintered samples prepared by 10 and 20 h milled powder was ~58.3vol% and ~51.3vol%,*** compressive strength and ductility of the 1200℃ sintered porous steel increased as the milling time increased.
Ecological Interface design (EID) has been shown to be an effective design approach for building single-operator interfaces for complex systems. However, in such systems, operators typically are also a part of a team....
Ecological Interface design (EID) has been shown to be an effective design approach for building single-operator interfaces for complex systems. However, in such systems, operators typically are also a part of a team. An experiment was conducted to examine the effect of EID on collaboration. Teams of two operated a feed water simulator, DURESSj, through a series of scenarios given either the EID interface or the Non-EID interface. It was found that there was no penalty to using EID, as scenario completion times with the EID interface were equivalent to the Non-EID interface. Indeed, EID operators demonstrated evidence of more robust control and reported significantly lower mental workload especially when dealing with system faults.
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