Publications by authors named "J I Park"

We report the first evidence for the h_{b}(2P)→ϒ(1S)η transition with a significance of 3.5 standard deviations. The decay branching fraction is measured to be B[h_{b}(2P)→ϒ(1S)η]=(7.

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Patients with Turner Syndrome (TS) and those exposed to high concentrations of glucocorticoids have a number of characteristics in common, including an increased risk of cardiovascular disease. Pediatric TS patients underwent studies of salivary cortisol (SC) and cortisone (SCn), body composition, continuous glucose monitoring, vascular function, and ambulatory blood pressure (BP). Biochemical indicators of cardiovascular risk were also measured.

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Objective: This case report demonstrates the orthodontic treatment to correct a severe scissor bite and occlusal disharmony in a 26-year-old female patient, including the use of temporary anchorage devices (TADs) and fixed orthodontic appliances.

Clinical Considerations: Severe scissor bite is associated with vertical problems, such as molar extrusion. For orthodontic treatment, interradicular TADs were used to intrude the extruded molars, control the inclination of molars, correct dental midline, and improve dental relationships.

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Multifocal near-eye displays present three-dimensional images by creating multiple image planes at different depths within eye integration time. The refresh rate of the usual display panel is, however, not sufficiently fast, which results in flickering for a large number of image planes or limited depth coverage for a small number of the image planes. In this paper, we propose a method to optimize the depth of field of each image plane, resolving the flickering issue by using fewer image planes while still ensuring broader coverage.

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In this paper, we propose what we believe to be a novel method to enhance both the field of view and angular resolution of a microlens array-based thin virtual reality near-eye display using a polarization grating. The proposed system employs a polarization grating to steer the field angle according to the polarization states, simultaneously enhancing the field of view and angular resolution. Optical experiments and Zemax simulations validate the effectiveness of our approach, with the field of view in the experimental setup expanding from 58.

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