464 research outputs found
Engaging Faith: My Story in God\u27s Story
No full textThis book is the fruit of lifelong study through which Jay Shim has pondered the Christian grounding for our lives and an understanding of redemption that encompasses all of God\u27s creation. Dr. Shim\u27s writing honors Biblical revelation from Genesis through Revelation as a wholistic story of salvation; and he expands his theological ideas with contributions from Augustine, Calvin, Kuyper, Bavinck, and contemporary sources. In a God-created world where all of reality is sacred, the author believes our calling as ambassadors of reconciliation and renewal is an effort of freedom and joy.https://digitalcollections.dordt.edu/books/1068/thumbnail.jp
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Modeling and simulation of non linear electrophoresis
No full textThis dissertation reports multi-dimensional numerical implementation and analytical solutions of two highly used electrophoretic separation techniques, isoelectric focusing (IEF) and isotachophoresis (ITP), in a microfluidic lab on a chip. A number of proteins and ampholytes have been simulated to elucidate the time evolution behaviors of proteins in microgeometries for the two techniques. Furthermore, a new pK determination method was developed from protein titration curve for computer simulation. As the final subject of the dissertation, the parallel computing model is developed in isoelectric focusing. Numerical modeling and simulation of ampholyte based isoelectric focusing were first developed to demonstrate the effect of complex microgeometries on the protein focusing under the influence of electric fields. A multi-dimensional computation model is formulated based on the mass conservation and ionic dissociation relations of amphoteric macromolecules, charge conservation, and the electroneutrality condition. 2D IEF is performed in the pH range using multiple ampholytes in the planar channel and in the contraction-expansion channel. In addition, for the parametric study, the effects of ampholyte dissociation constants and ampholyteconcentration on protein separations are studied in on-chip isoelectric focusing. In isotachophoresis, various advection and diffusion schemes are simulated for optimizing the numerical approach such as upwind, hybrid and power-law scheme. A nondimensional standard deviation index was introduced to evaluate the result of isotachophoresis and a cell Peclet number was suggested for accurate results of isotachophoresis simulation. The isotachophoresis model was specifically developed to expand the capillary (1D) microchannel to multi dimensional microchannel for complex microchip design. In the pK determination method, the new pK determination method was capable of being employed from simple amino acid to complex protein titration curve to determine multiple pK values from titration curve. Finite Volume based parallel implementation was conducted in isoelectric focusing for high speed simulation in the presence of up to 96 numbers of input components which areampholytes and proteins. The application was conducted on message passing interface (MPI). The parallelism was obtained in two equations (conservation of concentration equation and electroneutrality equation)
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Proposal of solid titanium shim and control rods
No full textThis report is a suggestion offered for a design modification regarding the material and layout of control and shim rods for the proposed G pile under design. The author suggests considering solid 2 inch diameter titanium control rods, in place of gadolinium-steel hollow 3 inch diameter rods which have been considered to this point. From a material cost and weight standpoint, and with regard to the neutron absorption properties, this suggestion appears better or equal to the original design proposal
Automatic Hyperparameter Optimization in the Drone Racing Context
No full textModern robotics is intertwined with artificial intelligence such as automatic controllers, and neural networks. Constructing such systems entail practitioners to carefully design hyperparameters of the intelligent modules embedded in the systems. Although such hyperparameters significantly affect the performance, finding an optimal configuration, in which the expert knowledge is required, becomes a tedious process. In this paper, we propose an evolutionary-based approach to perform automatic hyperparameter optimization, namely maximum velocity, acceleration and distance threshold at each gate, in the drone racing context. The hyperparameter update methods following the principal of optimality approach and greedy approach have been studied. The methods are evaluated in the high-fidelity drone racing simulator. The result suggests that the algorithm discovers the hyperparameter configuration that improves the best race time of the drone by a large margin from that of a human-designed configuration. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd
Near-field wireless power transfer and communication system design for corneal intraocular prosthetic device
No full textThis thesis reports the design of a novel intraocular projection device for the treatment of intractable corneal opacity, with a design emphasis on the simultaneous wireless power and data transfer system. Electronic ocular prosthetics (EOP) or artificial eyes are devices designed to deliver artificial visual stimuli to patients with blindness to partially restore their visual function.
The need for wireless capabilities in EOPs arises from the highly limited physical space available for the intraocular implant devices. Early attempts at EOPs incorporated prohibitively large battery power sources and physical wire connections for the transmission of both power and information. However, one of the vital health regulations on medical implant devices involves the potential infection and inflammation caused by the implantation. Such regulations strictly prohibit the use of physical wire between the interbody and external-body components. This thesis presents a wireless power transfer (WPT) implementation that allows the battery to be kept outside of the patient’s body, significantly reducing the size of the implanted components, while still supplying energy to the implant without a signal exchange wire. The designed devices maintain the needed power and data exchange with the embedded parts while minimizing potential health complications from surgically inserted cables and bulky embedded hardware.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01The student, Sarah Shim, accepted the attached license on 2018-12-02 at 14:14.The student, Sarah Shim, submitted this Thesis for approval on 2018-12-02 at 14:19.This Thesis was approved for publication on 2018-12-03 at 13:34.DSpace SAF Submission Ingestion Package generated from Vireo submission #13174 on 2019-02-07 at 14:18:46Made available in DSpace on 2019-02-07T20:39:42Z (GMT). No. of bitstreams: 2
SHIM-THESIS-2018.pdf: 3418630 bytes, checksum: ff1ba62cc8186481f3d9dcc058ce740e (MD5)
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Previous issue date: 2018-12-03Embargo set by: Seth Robbins for item 109851
Lift date: 2021-02-07T20:39:46Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 109851
Lift date: 2021-02-07T20:44:35Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 109851 on 2021-02-08T10:15:18Z
Temporal-order-based attentional priority modulates mnemonic representations in parietal and frontal cortices
No full textThe respective roles of occipital, parietal, and frontal cortices in visual working memory maintenance have long been under debate. Previous work on whether parietal and frontal regions convey mnemonic information has yielded mixed findings.
One possibility for this variability is that the mnemonic representations in high-level frontoparietal regions are modulated by attentional priority, such as temporal order. To test this hypothesis, we examined whether the most recent item, which has a higher attentional priority in terms of temporal order, is preferentially encoded in frontoparietal regions. On each trial, participants viewed 2 gratings with different orientations in succession, and were cued to remember one of them. Using fMRI and an inverted encoding model, we reconstructed population-level, orientation representations in occipital (V1–V3), parietal (IPS), and frontal (FEF) areas during memory maintenance. Unlike early visual cortex where robust orientation representations were observed regardless of serial order, parietal, and frontal cortices showed stronger representations when participants remembered the second grating. A subsequent experiment using a change detection task on color rings excluded the possibilities of residual stimulus-driven signals or motor preparative signals for responses. These results suggest that mnemonic representations in parietal and frontal cortices are modulated by temporal-order-based attentional priority signals.
© The Author(s) 2018. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: [email protected]
Control
No full textMBZIRC 2020 Challenge 3 is a competition in which a large amount of water is poured into a pipe about 10 cm in diameter on the outer wall of a building. Water should be sprayed using drones and accurately sprayed on disturbance such as wind and smoke. Between buildings, electromagnetic interference or reflection from buildings is so severe that accurate GPS information is not available. Control of Vision based was used to solve this problem. To extinguish fire, we attached a water tank and a water pump to the drone. These components are controlled by STM32 Arduino, and are made to communicate with Mission Computer through serial communication. Deep-Learning Network, which is MobileNet-SSD, was used for Vision to find fire in facade. Finally Visual Servoing was able to accurately spray water into tiny pipes. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd
An Efficatious Target-Field Approach to Design Shim Coils for Halbach Magnet of Mobile NMR Sensors
No full textThe main magnetic fields of mobile nuclear magnetic resonance (NMR) magnets differ from those of conventional NMR and magnetic resonance imaging (MRI) magnets. In the Halbach magnet, the main field B (0) is perpendicular to the longitudinal axis, the symmetry of the current distribution with respect to the symmetry of the magnetic field differs from that in conventional target-field applications, and the current distribution on the coil surface cannot be expressed in terms of periodic basis functions. To obtain the winding pattern of the coil, an efficacious target-field approach. The surface of a coil is divided into small discrete elements, where each element is represented by a magnetic dipole. From the stream function of the elements, the resultant magnetic field is calculated. The optimization strategy follows an objective function defined by the power dissipation or efficiency of the coil. This leads to the optimum stream function on the coil surface, whose contour lines define the winding patterns of the coil. This paper shows winding patterns designed of shim coils for Halbach magnet and illustrates the craft of a shim coil using flexible printed circuit board. The performance of the coils is verified by simulating the fields they produce over the sensitive volume.Physics, Atomic, Molecular & ChemicalSpectroscopySCI(E)EI1ARTICLE1101-1124
Strain Energy Release Rates of Modified ENF Specimen for Mixed Mode Fracture
No full textA modified ENF specimen for the mixed-mode fracture test is analyzed by the finite element method. The analysis is performed to calculate the mode I and mode II strain energy release rates and to compare the results with those obtained by the simple beam theory. The virtual crack closure method and displacement extrapolation method are employed in the finite element analysis to calculate the strain energy release rates. As for the relation between G<sub>1<> G<sub>1<> and the thickness ratio for the modified ENF specimen, the finite element result shows some discrepancy with the result by the simple beam theory. The results of present analysis show that the mode partitioning by the simple beam theory does not hold good for the specimen with different thicknesses of upper and lower arms.(Author abstract
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