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경유의 황성분이 SiC 매연저감장치의 성능에 미치는 영향
정건우(Gunwoo Jeong),강정호(Jeongho Kang),여아영(Ahyoung Yeo),정재우(Jae-Woo Chung),윤영훈(Younghun Yoon),정용현(Yonghyun Jeong),조재득(Jaedeug Jo),유영환(Younghwan You) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Nowaday, Many country have been using many kind of DPF system. But reduction efficiency was decrease when using less than 430ppm sulfur contents diesel fuel used for a long time. Because sulfur poisoning. Therefore, It was hard to using for diesel fuel. some country using less than 430ppm sulfur contents diesel fuel. In this paper was studied for endurable SiC filter of sulfur poisoning. Because Reduction efficiency decrease Occurs. due to sulfur contents Because low sulfur diesel used for a long time. than uses 30ppm of sulfur contents in Constraints on. Need to be developed. In order to export to foreign countries for consumption will occur So I need to be developed to sulfur poisoning resistant SiC filter. Properties were examined for Sulfur poisoning by dynamometer durability Test. As the result. Reduction efficiency was found that many were not different. to Emissions and particulate matter. Reduction efficiency changes depending on the amount of coating. Suggested the possibility to filter development.
Effect of mandibular contouring surgery on the stress distribution during various clenching tasks
Youngjae Yoon,Jae-eun Kim,정준호,Sang-Hwan Oh,Gunwoo Noh,권용대 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.2
A prominent mandibular angle produces a characteristic quadrangle with a coarse appearance. Asians prefer getting the shape of their jaws surgically corrected into a V-line, which is assumed to give a more intelligent, beautiful, and delicate appearance. According to many studies, mandibular contouring surgery may jeopardize mechanical stability. The aim of this study was to analyse the stress on the mandible during function after mandibular contouring surgery using finite element analysis. Based on computed tomography scans, the three-dimensional models of preoperative mandible, mandibular angle ostectomy, and sagittal cortical ostectomy of the mandibular ramus and body with angle ostectomy were obtained. Boundary conditions to restrict movement on both condyles and clenching tasks (incisal clench, right molar clench, and right group clench) were simulated. The sagittal cortical ostectomy model had the highest strain energy (48.51 J) and von Mises stress (77.39 MPa) during the right molar clench task. The maximum von Mises stress on the sagittal cortical ostectomy was increased by up to approximately four times compared with the cases of preoperative mandible. The stress was concentrated at the site of operation, mandibular condyle, and angle. In the case of the sagittal cortical ostectomy model, bone resorption may occur, and there is a possibility of fracture during the right molar clench task. These results suggest that mandibular contouring surgery may be related to the fragility of the mandible, since surgery significantly alters its biomechanics. The degree of surgery may be a determining factor in the stress and fracture risk of the mandible. Therefore, clinicians should establish an accurate and correct treatment plan for the safe prognosis of patients after surgery.