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임창현(C. H. Lim),정원규(W. K. Jeung),최석문(S. M. Choi),오용수(Y. S. Oh) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
A new rectangular shape microlens array having high sag for solid-state lighting is presented. Proposed microlens, which has high sag, over 375 ㎛μm and large diameter, over 3 ㎜ can enormously enhance output optical extraction efficiency. Rectangular shape of microlens can maximize the fill factor of light-emitting-diode (LED) package and minimize the optical loss at the same time. This wafer level microlens array is fabricated on LED package. It has many advantages in optical properties, low cost, high aligning accuracy, and mass production.
최용식,석창성,조용근,박종주,임창현 한국산업안전학회 1994 한국안전학회지 Vol.9 No.1
This paper has described the analysis of the Stress Intensity Factor behaviour of a short crack initiated from notch tip. The model for finite element analysis is a double edge notched specimen. The parameters used in this study are crack length and notch root curvature radius.