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강신일,이원희,홍정화,Kang, Shin-Ill,Lee, Won-Hee,Hong, Jung-Hwa 대한의용생체공학회 1997 의공학회지 Vol.18 No.3
An inverse method with regularization has been developed to determine the viscoelastic properties of trabecular bone. A series of stress relaxation experiments were performed under the condition of uniaxial compression stress state. Optimization has been formulated within the framework of nonlinear least-squares and a modified Gauss-Newton method with a zeroth-order regularization technique. The stress relaxation behavior of trabecular bone was analyzed using a standard viscoelastic model. The present study clearly shows that trabecular bone exhibits typical viscoelastic stress relaxation behavior, and the obtained material parameters well represent the viscoelastic behavior of trabecular bone.
정밀금형 알루미늄 합금주조공정시 주물 / 금형 접촉면에서의 Inverse 열전달해석에 관한 연구
문수동,강신일 ( Su Dong Moon,Shin Ill Kang ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.3
N/A Precision metal mold casting process is a casting method manufacturing mechanical elements with high precision, having heavy/light alloys as casting materials and using permanent mold. To improve dimensional accuracy and the final mechanical properties of the castings, the solidification speed and the cooling rate of the casting should be controlled with the optimum mold cooling system, and moreover, to obtain more accurate control of the whole process interfacial heat transfer characteristic at the mold/casting interface must be studied in advance. In the present study, aluminum alloy casting system with metal mold equipped with electrical heating elements and water cooling system was designed and the temperature histories at points inside the metal mold were measured during the casting process. The heat transfer phenomena at the mold/casting interface was characterized by the heat flux between solidifying casting metal and metal mold, and the heat flux history was obtained using inverse heat conduction method. The effect of mold cooling condition upon the heat flux profile was examined, and the analysis shows that the heat flux value has its maximum at the beginning of the process. (Received January 16, 1998)
Step-Up 구조를 갖는 다층박막 초소형 구동소자의 초기변형 최소화에 관한 연구
이희중,강신일,Lee, Hee-Joong,Kang, Shin-Ill 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
In the present study, a new anchor design was proposed to minimize the initial deflection of micro multi-layer cantilever beam with step-up structure, which is a key component of thin film micro-mirror array. It is important to minimize the initial deflection, caused by residual stress, because it reduces the performance of the actuation. Theoretical and experimental studies were conducted to examine the cause of the initial bending deflection. It was found that the bending deflection at the anchor of the cantilever beam was the primary source of initial deflection. Various anchor designs were proposed and the initial deflections for each design were calculated by finite element analysis. The analysis results were compared with experiments. To reduce the initial deflection a secondary support was added to the conventional structure. The optimal shapes were obtained by simulation and experiment. It was found from the analysis that the ratio or horizontal and vertical dimensions of secondary support was the governing factor, which affected the initial deflection.
근사 최적 기법을 이용한 변성 폴리페닐렌 옥사이드 폴리머의 점소성 모델 보정 연구
허수행(Su Haeng Hur),도재혁(Jaehyeok Doh),강신일(Shin Ill Kang),이준상(Joon Sang Lee),이종수(Jongsoo Lee) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.10
본 연구에서는 변성 폴리페닐렌 옥사이드(Modified Polyphenylene Oxide; MPPO) 폴리머 소재에 대하여 단축 인장 시험을 통해 기계적 물성을 측정하였다. 이를 바탕으로 MPPO의 기계적 거동을 기술하는 수정된 2층 점소성모델을 적용하여 유한요소해석을 통해 재료 상수에 대한 파라미터 분석을 수행하였다. 이를 통해 재료 모델에 유의한 재료 상수를 결정하고, 중심합성계획법을 이용해 전산실험계획을 수립하여 시험과 해석 간의 하중과 변위에 대한 평균제곱근오차를 산출하였다. 이어 오류 역전파 인공 신경망으로 재료 상수(입력)와 평균 제곱근 오차(출력) 관계에 대한 대리 모델을 생성하였다. 재료 상수 최적화 문제를 정식화하고 비 지배 분류 유전알고리즘-II를 이용하여 재료 상수에 대한 최적 해를 산출하였다. 이를 검증하기 위해 유한요소해석을 수행하여 기존 모델과 수정된 2층 점소성 모델에 대한 결과를 시험 데이터와 정량적으로 비교분석하여 MPPO 소재의 기계적 거동을 기술하는 모델을 확인하였다. In this study, mechanical properties of the modified polyphenylene oxide (MPPO) were measured using a uniaxial tensile test. Based on this, the modified two-layer viscoplastic model describing the mechanical behavior of MPPO was applied to conduct a parameter study concerning material constants through finite element analysis. Through this, meaningful material constants were determined for the material model, using which, a computational design of experiments using the interior central composite design (ICCD) was established. Then, the root mean square error (RMSE) for load and displacement between test and analysis was calculated. Subsequently, surrogate models for the relationship between material constants (input) and RMSE (output) were generated using a back-propagation neural network (BPN). The optimization problem of material constants was formulated and using the non-dominant sorting genetic algorithm-II (NSGA-II), an optimal solution of material constants was calculated. Based on these results, finite element analysis was performed to validate the model describing the mechanical behavior of the MPPO material by quantitatively comparing the results obtained using the conventional and modified two-layer viscoplastic model with experiment data.
급성 심근경색 검지를 위한 비표지식 단백질 센서 제작 및 검증에 관한 연구
조영걸 ( Young Geol Cho ),강기원 ( Ki Won Kang ),김효겸 ( Hyo Kyum Kim ),조익현 ( Eik Hyun Cho ),강신일 ( Shin Ill Kang ) 정보저장시스템학회 2013 정보저장시스템학회논문집 Vol.9 No.1
We proposed a method to fabricate label-free protein sensor with sub-wavelength nanograting structures to be used for diagnosing acute myocardial infarction. A nickel stamp for the injection molding of nanograting integrated protein sensor was fabricated by electroforming process with high fidelity. By using metallic stamp, we replicated label-free protein sensor via injection molding, which is an outstanding method for low-cost and mass production of polymer products. Finally, we performed a feasibility test, examining cardiac troponin T (cTnT) and anti-cTnT interactions. From the results, we demonstrated that the fabricated protein sensor can provide information for the early and accurate detection of cardiac diseases such as acute myocardial infarction.