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박홍익(Hong Ik Park),유지수(Ji Sue Yoo),이준영(Jun Young Lee),이상범(Sang Beom Lee),임홍재(Hong Jae Yim) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.2
이 논문은 배터리의 위치 변화에 따라 발생되는 OLEV의 처짐 개선을 위한 배터리 지지구조물의 설계에 대한 것이다. 배터리의 위치 변화에 따른 OLEV의 동강성을 유한요소해석을 통해 분석하였고, 동강성이 가장 높은 위치를 찾았다. 배터리 하중에 의한 최대 처짐을 정적 해석을 통해 분석하였다. 발생된 처짐을 줄이기 위해서 기본 프레임 부재별 기여도와 보강재 사용 시 보강재의 위치에 따른 기여도에 대한 평가를 수행하였고, 기여도가 높은 기본 프레임과 보강 프레임을 사용한 개선 모델을 선정하였다. 개선 모델을 사용하여 정적 해석을 수행하였고, 기본 모델과의 결과를 비교하였다. 기여도 평가를 통한 개선 및 보강으로 처짐을 목표치 이하가 되도록 하였고, 이 때 개선 모델의 질량이 기본 모델 보다 감소하는 것을 확인할 수 있었다. This paper presents methods to reduce the deflection of the battery-supporting structure on on-line electric vehicles (OLEVs). First, by testing various battery locations, a location is found that increases the dynamic stiffness of the OLEV. Second, static analysis is conducted to analyze the maximum deflection caused by the battery weight. In order to reduce the amount of deflection, the contributions of the battery-supporting structures are analyzed, and reinforcements are inserted. Then, another static analysis is conducted to compare the results of the base model and modified model. Consequently, through the static analysis, both the base model and modified model are similarly improved in terms of deflection, but the modified model is better than the base model at reducing the mass.
측면충돌 안전성 향상을 위한 차체의 점용접 배치 최적설계
박홍익(Hong Ik Park),김규학(Kyu Hak Kim),임홍재(Hong Jae Yim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this paper, the topology optimization of spot-weld layout design is performed for improving side impact performance. First, we conduct linear static analysis and nonlinear analysis about simple model to verify the process. Then the topology optimization is performed to find optimal spot-weld layouts. In this study, The volume fractions of spot-weld are used as design constraints, and the densities of each element in the individual design space are used as design variables. The objective function is to minimize the deformation of B-pillar. To confirm the improvement of side impact performance, optimal result of spot-weld layout design is applied in the car body and the side impact analysis is conducted. From the result of the analysis, we confirm the improvement of side impact performance. Finally, we obtained optimized spot-weld layout model.
박홍익(Hong Ik Park),유지수(Ji Soo You),이준영(Jun Young Lee),임홍재(Hong Jae Yim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
This paper presents methods to reduce the deflection of the OLEV. First, the location is found to increase the dynamic stiffness of the OLEV when changing the location of battery. Second, static analysis is conducted to analyze the maximum deflection by battery weight. In order to reduce the amount of deflection, contribution rate of battery supporting structures is analyzed and reinforcements are inserted. Then the static analysis is conducted to compare the results between base model and modified model. Consequently, through the static analysis, both base model and modified model are similarly improved about deflection but modified model is better at reducing the mass than base model.
외상성 양성 돌발성 체위성 현훈과 특발성 양성 돌발성 체위성 현훈의 임상적 특징의 비교
김홍대,윤희수,정재호,유한석,박철원,이승환 대한이비인후과학회 2016 대한이비인후과학회지 두경부외과학 Vol.59 No.12
Background and Objectives Benign paroxysmal positional vertigo (BPPV) is one of the most common diseases in patients with dizziness after head trauma. The aim of the study was to investigate the clinical characteristics of the traumatic BPPV (tBPPV) compared with idiopathic BPPV (iBPPV). Subjects and Method From January 2008 to June 2015, a retrospective review was performed on 572 patients diagnosed with BPPV and treated with appropriate canalith reposition maneuver. Clinical characteristics of patients, such as age, sex, affected semicircular canal, and number of reposition maneuver were evaluated and compared between iBPPV and tBPPV. Canal change and recurrence rate were also assessed. Results Among 572 BPPV patients, 509 were iBPPV and 63 were tBPPV. The male to female ratio was higher in tBPPV (26/37) than in iBPPV (142/367) (p=0.028). Posterior semicircular canal (PSCC) was more commonly affected than lateral semicircular canal in the tBPPV group compared with the iBPPV group (38/18 vs. 244/257). Also multiple canal was more commonly affected in the tBPPV group than in the iBPPV group (11.11/3.54%) (p=0.001). The tBPPV group needed fewer number of canalith reposition maneuver for symptom relief than the iBPPV group did (1.35 vs. 1.53, p=0.048). The side of affected canal was more frequently changed in tBPPV than in iBPPV (22.22% vs. 11.98%, p=0.023). There was no significant difference in recurrence rate between tBPPV and iBPPV (18.87% vs. 19.25%, p=0.518). However, the tBPPV group had a tendency of earlier recurrence than the iBPPV patients (1.33 month vs. 2.86 month, p=0.050). Conclusion tBPPV was more common in male and PSCC was usually affected. The tBPPV patients had a tendency of frequently changing the canal type and an earlier recurrence than the iBPPV patients. These distinguished clinical features would be useful in diagnosing and managing tBPPV patients. Korean J Otorhinolaryngol-Head Neck Surg 2016;59(12):819-24