Surgical planners are used to achieve the optimal outcome for surgery. They are especially desired in procedures where a positive aesthetic outcome is the primary goal, such as the Nuss procedure which is a minimally ...
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Surgical planners are used to achieve the optimal outcome for surgery. They are especially desired in procedures where a positive aesthetic outcome is the primary goal, such as the Nuss procedure which is a minima...
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Surgical planners are used to achieve the optimal outcome for surgery. They are especially desired in procedures where a positive aesthetic outcome is the primary goal, such as the Nuss procedure which is a minimally invasive surgery for correcting pectus excavatum (PE) - a congenital chest wall deformity. Although this procedure is routinely performed, the outcome depends mostly on the correct placement of the bar. It would be beneficial if a surgeon had a chance to practice and review possible strategies for placement of the corrective bar and the associated appearance of the chest. Therefore, we propose a strategy for the development of a Nuss procedure surgical trainer and planner, taking into account the biomechanical properties of the PE ribcage, emerging trends in surgical planners, deformable models, and visualization techniques. Additionally, we present the initial results of before and after surgery surface scans analysis as a means to validate results, comparison of an average chest shape with post-operative to quantify the outcome of the surgery, and the hardware setup of the simulator.
Efforts directed at enhancing and maturing NASA Langley Research Center's Airspace and Traffic Operations simulation (ATOS) and Aircraft simulation for Traffic Operations Research (ASTOR) software frameworks are d...
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Complexity associated with the design of experiments for simulation models can be reduced through visualization. DEVS-Suite, a new generation of the DEVS Tracking Envi-ronment which itself was extended from DEVSJAVA, ...
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Complexity associated with the design of experiments for simulation models can be reduced through visualization. DEVS-Suite, a new generation of the DEVS Tracking Envi-ronment which itself was extended from DEVSJAVA, sup-ports visual design of experiments and introduces simula-tion data visualization. Data generated by the selected models can be collected dynamically and displayed as time-based trajectories. These capabilities complement animation of DEVS model components and their interactions. A ser-vice-oriented software system is modeled to illustrate the novel modeling features for DEVS simulations. Another ex-ample is developed in Ptolemy II and SimEvents to show the reduced visual complexity afforded by DEVS-Suite.
A team of researchers experimentally investigated the drag of several components of parachute suspension systems commonly used for personnel and cargo airdrops. Specifically, the team determined drag coefficients for ...
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ISBN:
(纸本)9781563479724
A team of researchers experimentally investigated the drag of several components of parachute suspension systems commonly used for personnel and cargo airdrops. Specifically, the team determined drag coefficients for Type III nylon cord, 1000 lb spectra, and Type VII nylon webbing between Re = 400 to Re = 7,000, and tensions varying between 10 lbs and 55 lbs. All tests were conducted at an angle of attack of 90°. The momentum deficit method was used to determine the drag for each test configuration, and these were compared against baseline measurements of a 1/8 in diameter right circular cylindrical rod and a 2 in wide metal band. Close control of the pitot-static system yielded an uncertainty of approximately 10% for the calculations. The C'd for the Type III nylon cord ranged from .78 to 1.22, while for the spectra values remained close to a mean value of .70 over the range of tested conditions. Coefficient of drag data for the Type VII webbing closely matched the corresponding values for the metal band. A vortex shedding analysis did not indicate any synchronization with the natural frequency of the suspension lines, and the characteristic vortex shedding.
This paper presents a new assembly model named open assembly model plus (OAM+) to support legacy systems engineering (LSE). LSE is a collection of technologies for prolonging the life of old mechanical systems. Rapid ...
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The advent of Local Electrode Atom Probe (LEAP) tomography is revolutionizing materials science by enabling near atomic scale imaging of materials. Analysis of threedimensional atom probe tomography (APT) data holds t...
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The advent of Local Electrode Atom Probe (LEAP) tomography is revolutionizing materials science by enabling near atomic scale imaging of materials. Analysis of three-dimensional atom probe tomography (APT) data holds ...
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ISBN:
(纸本)9781424432134
The advent of Local Electrode Atom Probe (LEAP) tomography is revolutionizing materials science by enabling near atomic scale imaging of materials. Analysis of three-dimensional atom probe tomography (APT) data holds the promise of relating combinatorial arrangement of atoms to material properties and enable better design and synthesis of complex materials. Existing techniques, which are serial and require O(n 2 ) work for n atoms, do not scale to the hundred million large data sets produced by current generation atom probe microscopes. In this paper, we present an O(n) work autocorrelation based technique that reveals clustering of constituent atoms and spatial associations between them. We present an efficient parallelization of this method and show scaling on a 1,024 node Blue Gene/L. To our knowledge, this is the first parallel algorithm for the analysis of APT data, and together with our linear work autocorrelation technique, is demonstrated to easily scale to billion atom data sets expected in the very near future.
The Arnold engineering Development Center (AEDC) utilizes modeling and simulation technologies in support of the development of large, distributed real-time control systems. These technologies are used to mitigate ris...
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ISBN:
(纸本)9781604234466
The Arnold engineering Development Center (AEDC) utilizes modeling and simulation technologies in support of the development of large, distributed real-time control systems. These technologies are used to mitigate risk, reduce development cost, and avoid critical scheduling conflicts at AEDC's industrial facilities. The AEDC industrial facility to which a Programmable Logic Controller (PLC) controls system is to be deployed has a high degree of system complexity, a large number of critical controls, and high operational cost. This paper explains the distributed real-time simulation solution created for the PLC development effort. This involves a newly created (upgraded) interface between the industrial facility simulation (Matlab/Simulink) and the PLC control system. The benefits of the upgraded real-time solution include improved performance, cost, maintainability, and scalability. The ease with which models of AEDC's industrial facilities can be created has been greatly increased, and the sources of human error have been reduced. The simulation solution discussed in the paper involves the application of various COTS technologies in conjunction with the development of a new seamless, COTS-compatible software interface. This paper discusses the nature of the toolset being developed to support both current and future development efforts at AEDC. The toolset consists of both hardware and software components that can be configured to address a wide variety of simulation needs.
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