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Nonphosphor White Light Emitting Diodes by Mixed-Source Hydride Vapor Phase Epitaxy
Lee, Gang Seok,Jeon, Hunsoo,Jung, Se-Gyo,Bae, Seon Min,Shin, Min Jung,Kim, Kyoung Hwa,Yi, Sam Nyung,Yang, Min,Ahn, Hyung Soo,Yu, Young-Moon,Kim, Suck-Whan,Ha, Hong-Ju,Sawaki, Nobuhiko IOP Publishing 2012 Japanese journal of applied physics Vol.51 No.1
Min-Ju Ryu,Sung-Nam Gang,Sung-Hoon Lim 대한치과교정학회 2014 대한치과교정학회지 Vol.44 No.3
Objective: The purpose of this study was to evaluate the effects of three different surface conditioning methods on the shear bond strength (SBS) of metal brackets bonded directly to gold alloy with chemically cured resin. Methods: Two hundred ten type III gold alloy specimens were randomly divided into six groups according to the combination of three different surface conditioning methods (aluminum oxide sandblasting only, application of a metal primer after aluminum oxide sandblasting, silica coating and silanation) and thermocycling (with thermocycling, without thermocycling). After performing surface conditioning of specimens in accordance with each experimental condition, metal brackets were bonded to all specimens using a chemically cured resin. The SBS was measured at the moment of bracket debonding, and the resin remnants on the specimen surface were evaluated using the adhesive remnant index. Results: Application of metal primer after aluminum oxide sandblasting yielded a higher bond strength than that with aluminum oxide sandblasting alone (p < 0.001), and silica coating and silanation yielded a higher bond strength than that with metal primer after aluminum oxide sandblasting (p < 0.001). There was no significant change in SBS after thermocycling in all groups. Conclusions: With silica coating and silanation, clinically satisfactory bond strength can be attained when metal brackets are directly bonded to gold alloys using a chemically cured resin.
Ju, Gang San,Son, Kyung Min,Choi, Woo Young,Cheon, Ji Seon Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.4
Background: The open reduction of craniofacial bone fractures requires internal fixation using metal plates and screws, which have been considered the gold standard. However, metal implants pose a risk of palpation, protrusion, and foreign body reaction, and they may require an additional operation for removal. Recently, good results have been reported for absorbable implants which complement the disadvantages of metal implants. This study presents the results of using absorbable mesh, plates, and screws with cyanoacrylate for more accurate and firmer fixation of comminuted fractures of the maxilla. Methods: In total, 235 patients underwent operations for comminuted fractures of the maxilla. From January 2012 to December 2014, absorbable mesh and screws were used in 114 patients, while from January 2015 to December 2017, absorbable mesh, plates, and screws with cyanoacrylate were used in 121 patients. Open reduction of the bone fragments was performed, after which absorbable implants were accurately molded and fixed by screws. Results: All patients underwent postoperative computed tomography scans, which showed highly accurate reduction and firm fixation in the patients who underwent procedures using absorbable implants, screws, and cyanoacrylate. There were no postoperative complications or cases of abnormal facial contour. Conclusion: When absorbable implants and screws are used for maxillary fractures, no additional surgery to remove the metal plate is required. In addition, the use of cyanoacrylate enables accurate and firm fixation of the tiny bone fragments that cannot be fixed with screws.
Links between accelerated replicative cellular senescence and down-regulation of SPHK1 transcription
( Min Kyung Kim ),( Wooseong Lee ),( Gang-ho Yoon ),( Eun-ju Chang ),( Sun-cheol Choi ),( Seong Who Kim ) 생화학분자생물학회(구 한국생화학분자생물학회) 2019 BMB Reports Vol.52 No.3
We have identified a mechanism to diminish the proliferative capacity of cells during cell expansion using human adipose-derived stromal cells (hAD-SCs) as a model of replicative senescence. hAD-SCs of high-passage numbers exhibited a reduced proliferative capacity with accelerated cellular senescence. Levels of key bioactive sphingolipids were significantly increased in these senescent hAD-SCs. Notably, the transcription of sphingosine kinase 1 (SPHK1) was down-regulated in hAD-SCs at high-passage numbers. SPHK1 knockdown as well as inhibition of its enzymatic activity impeded the proliferation of hAD-SCs, with concomitant induction of cellular senescence and accumulation of sphingolipids, as seen in high-passage cells. SPHK1 knockdown-accelerated cellular senescence was attenuated by co-treatment with sphingosine-1-phosphate and an inhibitor of ceramide synthesis, fumonisin B1, but not by treatment with either one alone. Together, these results suggest that transcriptional down-regulation of SPHK1 is a critical inducer of altered sphingolipid profiles and enhances replicative senescence during multiple rounds of cell division. [BMB Reports 2019; 52(3): 220-225]
Organ Rupture Detection Algorithm of Surgical Robot
Ju Seok Kang,Nahian Rahman,Sung Min Yoon,Gm Gang Cha,Min Cheol Lee 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Reaction force estimation is the major challenge of surgical robotic procedures. In previous research, sliding mode control with sliding perturbation observer (SMCSPO) is used to estimate the reaction force in the sensor-less system. Moreover, a fuzzy-SPO method is also proposed to separate actual reaction force in presence of dynamic disturbances. However, in both those research, some physical constraints determined the SMCSPO parameters, which play a vital role in the force estimation sensitivity. The force sensitivity of the algorithm is equally important because extra force can cause organ impairment, rupture during surgery. Therefore, in this study, the force resolutions of the SPO and fuzzy-SPO for a robotic model have studied by Matlab simulation and it has seen that fuzzy-SPO performs better than classical SPO.
Effect of occult blood in feces on the risk of psoriasis: a nationwide population based cohort study
( Gang Min Go ),( Hyo Eun Park ),( Yu Jin Jung ),( Ju Hee Han ),( Hyun Jung Lee ),( Mi Ri Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The fecal immunochemistry test (FIT) has been proposed as a surrogate marker of intestinal inflammation. Psoriasis is a chronic inflammatory skin disease linked to inflammatory conditions, including psoriatic arthritis, cardiovascular disease, and inflammatory bowel disease. Objectives: To investigate the association between occult blood in feces, as indicated by a positive FIT result, and the risk of psoriasis in a South Korean population. Methods: We enrolled 1,395,147 individuals (> 50 years old) from the National Health Insurance System database who underwent health examinations from 2009 to 2012 and were followed up until December 31, 2017. We performed a Cox proportional hazards regression to calculate the association with the risk of psoriasis of the number of positive FIT results. Results: The incidence (1,000 person-years) of psoriasis was 3.76 vs. 4.14 (negative vs. positive FIT group) during a median follow-up of 6.68 years. Individuals with a greater number of positive FIT results were at higher risk of psoriasis. In the multivariable-adjusted model, the hazard ratios and 95% confidence intervals for psoriasis were 1.029 (0.997-1.061) for one positive FIT result, 1.118 (1.04- 1.201) for two positive FIT results, and 1.342 (1.157-1.557) for three positive FIT results compared with negative FIT results. Conclusion: Fecal hemoglobin is associated with an increased risk of psoriasis. The number of positive FIT results was linearly associated with the risk of psoriasis.