http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자동차용 경량 시트의 안전도를 고려한 최적화 설계 및 해석
정재윤(Jaeyun Jung),김범진(Bumjin Kim),허승진(Seungjin Hoo),이상기(Sangki Lee),김화식(Hwasik Kim),정철호(Chulho Jung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The purpose of this study is to suggest a concept of automotive seat design to reduce the structural weight and to develop the seat frame strength. In the paper, structural analysis required for development of seat frame was accomplished according to the test requirements by FMVSS 202. Using optimum design, upper and lower bracket detected as stress concentrated points were reinforced to reduce the maximum stress value. The most effective way to reduce the weight of seat frame is to use lighter materials like aluminum. The weight of aluminum seat frame could be reduced to about 43% compared with the existing steel seat frame.
이민규(Lee Minkyu),정재윤(Jung Jaeyun),고대건(Ko Daegun),박범수(Park Bumsu),최정훈(Choi Jeonghoon),한혜승(Han Hyeseung),김경주(Kim KyoungJoo),김현섭(Kim Hyunsup),김성규(Kim Sungkyu) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Recently, as electric vehicle technology has become more advanced, V2G (vehicle to grid) technology that uses batteries externally is being commercialized, and is divided into V2H (vehicle to home) and V2B (vehicle to building) depending on the type of grid connection. V2B services have a profit effect by discharging EV energy into the building when the building load is high, maintaining or lowering the buildings base rate, and for this purpose, accurate building load prediction is important. In this study, the results predicted by linear statistical models and nonlinear machine learning models were corrected with a multi-layer perceptron to derive the final results, and were evaluated using one years worth of actual load data on buildings.
이창근 ( Chang Gun Lee ),정재윤 ( Jaeyun Jung ),황삼노 ( Samnoh Hwang ),박찬오 ( Chan Oh Park ),황순재 ( Soonjae Hwang ),조민정 ( Minjeong Jo ),신민희 ( Min Hi Sin ),김현호 ( Hyun Ho Kim ),이기종 ( Ki-jong Rhee ) 대한임상검사과학회 2018 대한임상검사과학회지(KJCLS) Vol.50 No.3
매선요법은 다른 시술에 비해 비침습적이고, 인체 내에서 생분해가 일어나는 물질로 제작되기 때문에 성형수술에서 각광받고 있다. 상업적으로 이용가능한 매선의 종류로는 poly-L-lactic acid (PLLA), polycarprolactone (PCL), polydioxanone (PDO) 등이 있으나, 매선으로 사용되는 생분해성 물질들의 종류에 따른 차이점이나, 콜라겐을 형성하는데 있어서 매선의 어떤 부분이 결정적으로 작용하는지에 대한 연구는 잘 알려져 있지 않다. 따라서 이 연구에서는 현재 판매되고 있는 3가지 생분해성 물질(PLLA, PCL, PDO)로 만들어진 매선을 동물모델에서 그 효과를 비교하고, 매선의 콜라겐생성능에 미치는 영향 인자가 무엇인지를 분석하였다. 매선을 랫드의 등에 삽입하여 2주, 4주, 8주, 12주동안 경과를 관찰하고 특수염색을 통해 콜라겐의 생성 정도를 비교하였다. 매선에 의한 조직학적 변화를 관찰하기 위해서, 조직검체는 H&E, Masson’s trichrome, Herovici’s collagen stain이 진행되었다. 그 결과 3가지 모두 다 동일한 시기에 비슷한 양의 신생콜라겐을 형성하는 것을 관찰할 수 있었고, 3가지 매선 모두 type 3의 콜라겐을 형성하는 것을 확인할 수 있었다. 또한 생성되는 콜라겐의 양은 매선이 피부조직에 닿는 면적이 크면 클수록 증가하는 것을 관찰할 수 있어 한 번의 시술만으로도 많은 양의 매선이 들어갈 수 있는 PDO cavern타입의 매선이 가장 많은 콜라겐을 형성하는 것을 확인할 수 있었다. Thread lifting has become popular as a minimally invasive technique for facial rejuvenation. Commercially available threads are composed of poly-L-lactic acid (PLLA), polycaprolactone (PCL), or polydioxanone (PDO). However, the histological changes that occur in response to implanted threads are unclear. The aim of this study was to evaluate histological changes that occur in response to implantation with three types of bioresorbable threads (PLLA, PCL, PDO) in rat skin. PLLA, PCL and PDO threads were implanted in the dorsal skin of Sprague Dawley rats and tissue samples were harvested 2, 4, 8 and 12 weeks post-implantation. To evaluate histologic changes induced by bioresorbable face-lifting threads, tissue samples were stained with hematoxylin & eosin, Masson’s trichrome stain and Herovici’s collagen stain. All three threads induced neocollagenesis of type 3 collagen in the rat skin. The amount of collagen induced by the threads was dependent on the thread surface area. The PDO cavern-type thread was most effective in inducing neocollagenesis due to its extensive surface area. Our results suggest that type 3 collagen induced by bioresorbable threads depends on the thread surface area to uphold the dermis and contributes to facial rejuvenation.
승용차용 시트의 경량화 및 내구성능 향상을 위한 최적설계
김병길(Byungkill Kim),정재윤(Jaeyun Jung),김민수(Min-Soo Kim),허승진(Seungjin Heo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents an optimum design of minimizing vehicle's seat weight while satisfying stress and fatigue life constraints. In this study, the analysis model is validated by comparing it's stress with that of test. Then, two-level orthogonal array is used to estimate design sensitivity and the incomplete small composite design (ISCD) is employed for quadratic RSM models. Finally, the sequential approximate optimization (SAO) is performed using the constructed RSM models. The approximate RSM models are sequentially updated using the analysis results corresponding to the approximate optimum obtained during the SAO. After 14 analyses, the SAO gives an optimal design that can reduce 9 % of weight while increasing 4 % of fatigue life and satisfying stress constraint.<br/>