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Juyoung Choi,Hyunbae Dong,함승주,이상엽 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.6
The electrical repulsive energy between two model cylinders was calculated by solving nonlinear Poission- Boltzmann (P-B) equation under Derjaguin approximation. Effects of the surface potential, Debye screening length, and configuration of cylinders on the repulsive interaction energy were examined. Due to the anisotropy of the shape of cylinder, the interaction repulsive energy showed dependence to the configuration of particles; cylinders aligned in end-to-end configuration showed largest repulsive energy and crossed particles had lowest interaction energy. The configuration effect is originated from the curvature effect of the interacting surfaces. The curved surfaces showed less repulsive energy than flat surfaces at the same interacting surface area. The configuration dependency of interaction energy agreed with the previous analytical solution obtained under the linearized P-B equation. The approach and
최주영(Juyoung Choi),김정미(Jung-Mi Kim),강영진(Young-Jin Kang),노유정(Yoojeong Noh) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Human feet are easily deformed by congenital foot shape or gait. Foot deformations can cause diseases of the spine or joints, so foot deformations can be prevented or treated using customized insoles. However, since it takes much time and cost to produce customized insoles, the insoles pads are manufactured by additive manufacturing techniques such as 3D printing recently. However, pads manufactured with 3D printing have different material properties depending on the printing patterns and infill densities, making it difficult to provide a pad suitable for individual foot deformation. This study proposed the measurement method of plantar pressures and optimized the printing patterns and infill densities for 3D printing by minimizing the difference in plantar pressure distribution between normal pads and 3D printing pads.
A Block-Based Graph Model for Effective Wrapper Maintenance
Juyoung park,Joongmin Choi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
The wrapper is a special program which can automatically extract the information from the web pages which has a structured form. Most of the web pages are changed frequently and grow constantly. The structure of the web page is also changed frequently. The wrapper which is created before may not extract the information accurately from the changed web pages. In case that the structure of a web page is changed, even though wrapping operations are performed on the same information, the wrapper may not extract information practically. To solve this problem, we propose the novel method that segments a web page into visual block units and compose them as graph model. As a result, the graph model would be efficient wrapper management. The existing wrapper can extract the target information through the comparison of the graph model with the new one even if the structure of web page is changed.
Choi, Seo Hee,Lee, Juyoung,Nam, Soo Kyung,Jun, Yong Hoon The Korean Society of Neonatology 2021 Neonatal medicine Vol.28 No.1
Purpose: Premature infants have immature respiratory control and cerebral autoregulation. We aimed to investigate changes in cerebral oxygenation during apnea with and without peripheral oxygen desaturation in premature infants. Methods: This prospective observational study was conducted at Inha University Hospital. Near-infrared spectroscopy (NIRS)-monitored regional cerebral oxygen saturation (rScO<sub>2</sub>) and pulse oximeter-monitored peripheral oxygen saturation (SpO<sub>2</sub>) were assessed during the first week of life in 16 stable, spontaneously breathing preterm infants. Apneic episodes that lasted for ≥20 seconds or were accompanied by desaturation or bradycardia were included for analysis. The average rScO<sub>2</sub> value during the 5-minute prior to apnea (baseline), the lowest rScO<sub>2</sub> value following apnea (nadir), the time to recover to baseline (recovery time), the area under the curve (AUC), and the overshoot above the baseline after recovery were analyzed. Results: The median gestational age and birth weight of the infants were 29.2 weeks (interquartile range [IQR], 28.5 to 30.5) and 1,130 g (IQR, 985 to 1,245), respectively. A total of 73 apneic episodes were recorded at a median postnatal age of 2 days (IQR, 1 to 4). The rScO<sub>2</sub> decreased significantly following apneic episodes regardless accompanied desaturation. There were no differences in baseline, nadir, or overshoot rScO<sub>2</sub> between the two groups. However, the rScO<sub>2</sub> AUC for apnea with desaturation was significantly higher than that for apnea without desaturation. Conclusion: Cerebral oxygenation can significantly decrease during apnea, especially when accompanied by reduced SpO<sub>2</sub>. These results add the evidence for the clinical utility of NIRS in monitoring premature infants.