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부분의치환자의 수면무호흡증 개선용 하악 전방 이동장치의 최적설계와 FEA를 통한 안정성 평가
박시명(Si-Myung Park),박소연(Soyeon Park),최혜인(Hyein Chio),김래현(Laehyun Kim),이수홍(Soo Hong Lee),노건우(Gunwoo Noh) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The objective of this study is to propose a new mandibular advancement device (MAD) design by applying optimal design techniques. The new MAD is designed to improve the instability that can occur when a partial denture patient uses a conventional MAD. The MAD is a convenient way to artificially move the mandible forward to treat obstructive sleep apnea (OSA), which is common in middle-aged people. The artificially moving the mandible forward may result in jaw joint disorders or unintentional tooth movement. Particularly, it is suspected that patients with partial dentures will need to pay more attention to the use of MAD, but no objective results were reported. In this study, we compared the stability of the mandibular and dental components when using conventional MAD for normal and partial denture models. In the case of the partial denture model, a higher stress was applied to the bone than in the normal case, which was in the range of risk that could lead to bone resorption. Topology optimization tasks were performed to minimize the strain energy and volume of the MAD compared to the conventional MAD, as well as to reduce bone stress into the biomechanically stable range.
부분의치환자의 수면무호흡증 개선용 하악 전방 이동장치의 최적설계
박시명(Si-Myung Park),박소연(Soyeon Park),최혜인(Hyein Chio),김래현(Laehyun Kim),이수홍(Soo Hong Lee),노건우(Gunwoo Noh) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.6
하악 전방 이동 장치(Mandibular Advancement Device; MAD)는 하악을 전방 이동시킴으로써 폐쇄성수면 무호흡증을 치료할 수 있는 편리한 방법이다. 그러나 기존 MAD를 부분 의치를 가진 환자에게 사용했을 때 턱 관절 장애 또는 의도하지 않은 치아 이동 등의 부작용을 초래할 가능성이 있다. 본 연구는 부분 의치 환자를 위해 기존 MAD의 디자인을 향상시키는 것을 목표로 진행하였다. 부분 의치 환자를 대상으로 기존의 MAD를 사용했을 때 초래될 수 있는 부작용을 파악하고, 안정성을 향상시키기 위해 밀도 기반 위상최적화 기법을 적용하였다. 위상최적설계 작업은 기존의 MAD에 비해 MAD의 변형 에너지 및 부피를 최소화하고 생체 역학적으로 안정한 범위로 골 응력을 감소시키는 것을 목표로 수행되었다. A mandibular advancement device (MAD) is a convenient means to treat obstructive sleep apnea by moving the mandible of the patient forward. However, the MAD may result in jaw joint disorders or unintentional tooth movement in patients with partial dentures. The objective of this study is to enhance the design of the MAD for patients with partial dentures. As the conventional MAD often results in complications, a density-based topology optimization technique is utilized to enhance the stability of the MAD. Topology optimization tasks are performed to minimize the strain energy and volume of the MAD as well as to reduce bone stress to a biomechanically stable range.
학교 건축물의 모형실험을 통한 국내지진에 대한 내진보강에 관한 연구
신혜민(Shin, Hye-Min),전아현(Jun, A-Hyun),최혜지(Chio, Hye-ji),팽지영(Paeng, Ji-Yeong),유민지(Yu, Min-ji),이재경(Lee, Jae-gyoung),이현지(Lee, Hyeon-Ji),신경재(Shin, Kyung-Jae) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The purpose of this study is to develop various seismic reinforcement through shaking table test and nonlinear analysis of the school building. After the Gyeongju 9.12 earthquake, the government has set a policy to extend the scope of the mandatory seismic design on new buildings and public buildings, and to expand the seismic reinforcement of public buildings with low rate of seismic design. 86% of elementary, middle, and high school buildings surveyed in Korea were found to be vulnerable to earthquakes. Therefore, it is necessary to strengthen the seismic reinforcement of the school buildings that should be used as a disaster evacuation facility.