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Collagen Formation and Adhesion of Human Gingival Fibroblasts on the IBAD Ca - P Coating on Ti
B. H. Zhao,F. Z. Cui,I-S. Lee,W. Bai,H. L. Feng 한국진공학회(ASCT) 2003 Applied Science and Convergence Technology Vol.12 No.S1
Coatings of hydroxyapatite (HA) and tricalcium phosphate/HA (TCP/HA) on titanium were fabricated by ion beam assisted deposition (IBAD). Significant effect of the Ca-P coatings on human Gingival Fibroblasts (HGFs) attachment and formation of type I collagen were found by using immunofluorescence microscope. TCP/HA and HA coatings exerted more HGFs attachment and collagen I formation. Comparing with HA coating, TCP/HA coating exhibited better responses during the late period of the tests. This investigation indicated that this surface modification method may enhance the biological seal at the cervical level of the titanium dental implants.
BOHR’S INEQUALITIES IN n-INNER PRODUCT SPACES
W. S. Cheung,조열제,J. Peˇcari´c,D. D. Zhao 한국수학교육학회 2007 純粹 및 應用數學 Vol.14 No.2
The classical Bohr's inequality states that |z + w|2 ≤p|z|2 + q|w|2 for all z,w∈C and all p,q > 1 with 1/p +1/q = 1. In this paper, Bohr's inequality is generalized to the setting of n-inner product spaces for all positive conjugate expo-nents p,q∈R. In particular, the parallelogram law is recovered and an interesting operator inequality is obtained.
상 그룹 집중권 권선을 이용한 FSPMM의 극수 슬롯수 조합에 따른 특성 비교
권중우(J. W. Kwon),조문량(Wenliang, Zhao),권병일(B. I. Kwon) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.3
본 논문에서는 상 그룹 집중권 권선법(Phase-Group Concentrated-Winding)을 이용한 FSPM(Flux-Switching Permanent Magnet Motor)의 극수 슬롯수들을 서로 다르게 조합하여, 이들에 대한 각 특성들을 해석하였다. 전동기의 토크를 높이기 위해 상 그룹 집중권 권선법을 적용하였으며, FSPMM의 특성상 높은 코깅토크와 토크리플을 저감하기 위해 최적의 슬롯수 극수 조합을 구하였다. 최적의 조합을 구하기 위해 비교된 여러 극수 슬롯수 조합들은 각 상 그룹에 속하는 코일의 개수와 그룹의 수에 따라 구성되었다. 또한, 특정 식을 사용하여 모델의 분포계수가 1이면서 동시에 역기전력이 정현파가 되도록 설계하였다. 각 조합들의 특성비교를 위한 해석은 2차원 유한요소법해석을 사용하였다. 유한 요소법 해석을 통해 해석된 코깅토크, 토크리플, 평균토크, 토크밀도 등을 서로 비교하여 각 조합에 따른 모델의 특성들을 확인하였다.
DYNAMIC ANALYSIS AND DESIGN CALCULATION METHODS FOR POWERTRAIN MOUNTING SYSTEMS
W.-B. SHANGGUAN,Y. ZHAO 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.6
A method for dynamic analysis and design calculation of a Powertrain Mounting System (PMS) including Hydraulic Engine Mounts (HEM) is developed with the aim of controlling powertrain motion and reducing low-frequency vibration in pitch and bounce modes. Here the pitch mode of the powertrain is defined as the mode rotating around the crankshaft of an engine for a transversely mounted powertrain. The powertrain is modeled as a rigid body connected to rigid ground by rubber mounts and/or HEMs. A mount is simplified as a three-dimensional spring with damping elements in its Local Coordinate System (LCS). The relation between force and displacement of each mount in its LCS is usually nonlinear and is simplified as piecewise linear in five ranges in this paper. An equation for estimating displacements of the powertrain center of gravity (C.G.) under static or quasi-static load is developed using Newton’s second law, and an iterative algorithm is presented to calculate the displacements. Also an equation for analyzing the dynamic response of the powertrain under ground and engine shake excitations is derived using Newton’s second law. Formulae for calculating reaction forces and displacements at each mount are presented. A generic PMS with four rubber mounts or two rubber mounts and two HEMs are used to validate the dynamic analysis and design calculation methods. Calculated displacements of the powertrain C.G. under static or quasi-static loads show that a powertrain motion can meet the displacement limits by properly selecting the stiffness and coordinates of the tuning points of each mount in its LCS using the calculation methods developed in this paper. Simulation results of the dynamic responses of a powertrain C.G. and the reaction forces at mounts demonstrate that resonance peaks can be reduced effectively with HEMs designed on the basis of the proposed methods.