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Shun-Jen Yu,Yi-Hao Lee,Ching-Ping Lin,Aaron Yu-Jen Wu 대한치주과학회 2019 Journal of Periodontal & Implant Science Vol.49 No.4
Purpose: To analyze the maxillary sinus anatomy over edentulous ridges in the bilateral posterior maxillary area in Taiwanese patients using cone-beam computed tomography (CBCT). Methods: In total, 101 anatomical sites from 61 patients, including 32 premolar and 69 molar regions, were analyzed using CBCT. Measurements were made of the width and height of edentulous ridges, the thickness of the lateral wall of the maxillary sinus, and the presence of a sinus septum and the posterior superior alveolar artery (PSAA). A statistical analysis of the measurements was performed, and correlations among the measurements were assessed. Results: The average ridge width was 10.26±3.16 mm, with a significantly greater ridge width in the second molar region than in the premolar region. The mean residual ridge height was 8.55±4.09 mm, and ridge height showed an opposite trend from ridge width for the premolar and molar regions. A sinus septum was present at 5.9% of the sites, and the PSAA was observed in 24.5%. The average thickness of the lateral wall of the maxillary sinus was 2.08±0.94 mm, with no significant difference between the tooth position and lateral wall thickness. Conclusions: This study presents the anatomical features of the maxillary sinus, which should be considered in sinus lift procedures for implant placement, in the Taiwanese population. The use of CBCT is recommended to avoid intraoperative complications.
Cloud computing with single server threshold and double congestion thresholds
Shun-Ping Chung,Yu-Ju Lu,Yu-Chen Lai 한국통신학회 2018 ICT Express Vol.4 No.3
In this work, we study how to minimize the average system delay in a cloud computing center with heterogeneous servers, where each server may have a different average service rate. We consider M∕Mi∕C∕K with a single server threshold and double congestion thresholds. The analytical models and performance measures are derived for the systems considered. The effect of the average arrival rate on performance measures is studied. It is shown that M∕Mi∕C∕K with a single server threshold and double congestion thresholds outperforms M∕Mi∕C∕K in terms of the average system delay. Finally, a computer simulation is written to verify the accuracy of the analytical results.
Yu, Shun-Jen,Lee, Yi-Hao,Lin, Ching-Ping,Wu, Aaron Yu-Jen Korean Academy of Periodontology 2019 Journal of Periodontal & Implant Science Vol.49 No.4
Purpose: To analyze the maxillary sinus anatomy over edentulous ridges in the bilateral posterior maxillary area in Taiwanese patients using cone-beam computed tomography (CBCT). Methods: In total, 101 anatomical sites from 61 patients, including 32 premolar and 69 molar regions, were analyzed using CBCT. Measurements were made of the width and height of edentulous ridges, the thickness of the lateral wall of the maxillary sinus, and the presence of a sinus septum and the posterior superior alveolar artery (PSAA). A statistical analysis of the measurements was performed, and correlations among the measurements were assessed. Results: The average ridge width was $10.26{\pm}3.16mm$, with a significantly greater ridge width in the second molar region than in the premolar region. The mean residual ridge height was $8.55{\pm}4.09mm$, and ridge height showed an opposite trend from ridge width for the premolar and molar regions. A sinus septum was present at 5.9% of the sites, and the PSAA was observed in 24.5%. The average thickness of the lateral wall of the maxillary sinus was $2.08{\pm}0.94mm$, with no significant difference between the tooth position and lateral wall thickness. Conclusions: This study presents the anatomical features of the maxillary sinus, which should be considered in sinus lift procedures for implant placement, in the Taiwanese population. The use of CBCT is recommended to avoid intraoperative complications.
Detection of Near-membrane Calcium Ions in Live Tissues with a Two-Photon Fluorescent Probe
Yu Na Shin,임창수,Yu Shun Tian,Won Young Rho,조봉래 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.3
A two-photon fluorescent probe (ACaCL) that can detect near-membrane Ca2+ is reported. This probe can be excited by 780 nm fs pulses, shows high photostability and negligible toxicity, and can visualize near-membrane Ca2+ in live cells and deep inside live tissues by two-photon microscopy.
Progressive failure of metal–composite hybrid wheels under impact
Shun-Fa Hwang,Hui-Lun Yu,Yu-Jen Liu,Yuder Chen,Shih-Chieh Chen,Yueh-Chih Hsieh 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
An 18-in hybrid wheel consisting of an aluminum alloy disk and a composite rim under 13° impact test is considered in this study. The rim is made of carbon fabric/polyurethane composites fabricated by resin transfer molding. Explicit finite element analysis with progressive failure function is used to investigate the failure situation of the hybrid wheel and the suitable braid angle of the braided composite. The effective elastic constants and strengths of the braided composites predicted by basic finite element analyses are adopted, whereas the true stress–strain curve of aluminum is used for the disk. Simulation results indicate that the aluminum alloy disk is safe after the impact test, whereas the rim is damaged. The volume of failed elements after impact simulation is selected as an indicator to obtain a quantity that can be used to represent the damage situation of the rim. Compared with the test results of a real hybrid wheel with [±30°] fiber angle in the rim, the hybrid wheel with fiber angle in the rim that is greater than [±30°] could pass the impact test.
Yu, H.,Hyuk Park, S.,Sun You, B.,Min Kim, Y.,Shun Yu, H.,Soo Park, S. Elsevier Sequoia 2013 Materials science & engineering. properties, micro Vol.583 No.-
The effects of extrusion speed on the microstructure and tensile properties of the ZK60 and ZK60-1Ce alloys were investigated by performing indirect extrusion at three ram speeds (0.3, 1.0 and 3.0mm/s). All of the extruded alloys showed a bimodal microstructure consisting of equiaxed fine recrystallized (DRXed) grains and elongated coarse unDRXed grains. With increasing extrusion speed, the exit temperature increased due to deformation heating, resulting in a larger grain and a higher DRXed fraction. The yield and ultimate tensile strengths and elongation at RT decreased with an increase of extrusion speed. The ZK60-1Ce alloys exhibited a finer grain size, a higher DRXed fraction, and weaker texture intensity than the ZK60 alloys at the same extrusion speed due to the inhibition of grain growth by the pinning effect and the promotion of DRX by particle-stimulated nucleation. The yield and ultimate tensile strengths at room and elevated temperatures were increased by the addition of Ce, while elongation was decreased due to cracking at the Mg-Zn-Ce particles.
Yu Shun Tian,Hyun Joo Jeong,Sang-Do Lee,Seok Heui Kong,Seung-Ho Ohk,Yun-Jung Yoo,Jeong-Taeg Seo,Dong Min Shin,Byung-Wha Sohn,Syng-Ill Lee 대한생리학회-대한약리학회 2010 The Korean Journal of Physiology & Pharmacology Vol.14 No.3
The hyperosmotic stimulus is regarded as a mechanical factor for bone remodeling. However, whether the hyperosmotic stimulus affects 1Ձ, 25-dihydroxyvitamin D<sub>3</sub> (1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>)-induced osteoclastogenesis is not clear. In the present study, the effect of the hyperosmotic stimulus on 1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>- induced osteoclastogenesis was investigated in an osteoblast-preosteoclast co-culture system. Serial doses of sucrose were applied as a mechanical force. These hyperosmotic stimuli significantly evoked a reduced number of 1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>-induced tartrate-resistant acid phosphatase-positive multinucleated cells and 1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>-induced bone-resorbing pit area in a co-culture system. In osteoblastic cells, receptor activator of nuclear factor ՊB ligand (RANKL) and Runx2 expressions were down-regulated in response to 1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>. Knockdown of Runx2 inhibited 1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>-induced RANKL expression in osteoblastic cells. Finally, the hyperosmotic stimulus induced the overexpression of TonEBP in osteoblastic cells. These results suggest that hyperosmolarity leads to the down-regulation of 1Ձ,25(OH)<sub>2</sub>D<sub>3</sub>- induced osteoclastogenesis, suppressing Runx2 and RANKL expression due to the TonEBP overexpression in osteoblastic cells.
Tian, Yu-Shun,Jeong, Hyun-Joo,Lee, Sang-Do,Kong, Seok-Heui,Ohk, Seung-Ho,Yoo, Yun-Jung,Seo, Jeong-Taeg,Shin, Dong-Min,Sohn, Byung-Wha,Lee, Syng-Ill The Korean Society of Pharmacology 2010 The Korean Journal of Physiology & Pharmacology Vol.14 No.3
The hyperosmotic stimulus is regarded as a mechanical factor for bone remodeling. However, whether the hyperosmotic stimulus affects $1{\alpha}$, 25-dihydroxyvitamin $D_3$ ($1{\alpha},25(OH)_2D_3$)-induced osteoclastogenesis is not clear. In the present study, the effect of the hyperosmotic stimulus on $1{\alpha},25(OH)_2D_3$-induced osteoclastogenesis was investigated in an osteoblast-preosteoclast co-culture system. Serial doses of sucrose were applied as a mechanical force. These hyperosmotic stimuli significantly evoked a reduced number of $1{\alpha},25(OH)_2D_3$-induced tartrate-resistant acid phosphatase-positive multinucleated cells and $1{\alpha},25(OH)_2D_3$-induced bone-resorbing pit area in a co-culture system. In osteoblastic cells, receptor activator of nuclear factor ${\kappa}B$ ligand (RANKL) and Runx2 expressions were down-regulated in response to $1{\alpha},25(OH)_2D_3$. Knockdown of Runx2 inhibited $1{\alpha},25(OH)_2D_3$-induced RANKL expression in osteoblastic cells. Finally, the hyperosmotic stimulus induced the overexpression of TonEBP in osteoblastic cells. These results suggest that hyperosmolarity leads to the down-regulation of $1{\alpha},25(OH)_2D_3$-induced osteoclastogenesis, suppressing Runx2 and RANKL expression due to the TonEBP overexpression in osteoblastic cells.