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영상 패치 균질도를 이용한 항공 탑재 초점면배열 중적외선 카메라 영상 기반 불균일 보정 기법 연구
강명호,윤은숙,박가영,고영준 한국광학회 2022 한국광학회지 Vol.33 No.4
The detector of a focal-plane-array mid-wave infrared (MWIR) camera has different response characteristics for each detector pixel, resulting innonuniformity between detector pixels. In addition, image nonuniformity occurs due to heat generation inside the camera during operation. To solvethis problem, in the process of camera manufacturing it is common to use a gain-and-offset table generated from a blackbody to correct the differencebetween detector pixels. One method of correcting nonuniformity due to internal heat generation during the operation of the camera generates a newoffset value based on input frame images. This paper proposes a technique for dividing an input image into block image patches and generating offset values using only homogeneous patches, to correct the nonuniformity that occurs during camera operation. The proposed technique may not only generate a nonuniformity-correction offset that can prevent motion marks due to camera-gaze movement of the acquired image, but may also improve nonuniformity-correction performance with a small number of input images. Experimental results show that distortion such as flow marks does not occur, and good correction performance can be confirmed even with half the number of input images or fewer, compared to the traditional method.
강명호,이지영 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Based on density-functional theory calculations, we have examined the electronic structure of the conjugate honeycomb-chained-trimer model previously proposed for the Au/Si(111)-(p3×p3)R30˚ surface, For the optimized atomic structure, we calculate the surface band structure and simulate scanning-tunneling-microscopy (STM) images. The simulated STM images are compatible with the STM measurements, but the calculated surface band structure partly differs from angle-resolved photoelectron measurements. The present results indicate that a better model is required for the Au/Si(111)-(p3 × p3)R30˚ surface.
레진의치상 수리 시 인공타액 흡수도에 따른 결합강도 연구
강명호,이명곤,Kang, Myung-Ho,Lee, Myung-Kon 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.1
Purpose: There are some advantages of the acrylic resin denture base ; appropriate strength, volume safety, simple processing apparatus, and low cost. But, it have a weakness for fracture by intense pressure or shock. However, the repairs for resin denture base are possible using various materials and techniques. There is a few studies in repairs for resin denture base, but not clinical researches. And there is no studies in absorbed saliva into the region of fracture and bond strength. This study is to observe re-bond strength of resin denture base after repairing under saliva absorption. Methods: The samples were made of heat curing resin and the rectangular parallelepiped specimens which were 50mm long, 10mm wide and 3mm high. The four different groups immersed in the artificial saliva for 2 weeks were prepared, 1) no repaired control samples, 2) immediately repaired samples, 3) repaired samples after 1 day dry, and 4) repaired samples after 3 days dry. The prepared samples were repaired by two different curing materials, self curing resin and heat curing resin method. Each groups composed of 10 specimens were experimented with the three point bending tests for bonding strength measuring Results: There were under condition absorbed in the artificial saliva and repaired by self curing resin method, repaired specimens after 1 day and 3 days dry groups had higher values of bonding strengths than control group, and bonding strengths of immediately repaired samples were similar to those of control samples (p<0.05). There were under condition immersed in the artificial saliva and repaired by heat curing resin method, immediately repaired samples showed similar values to bonding strengths of control groups, and repaired samples after 1 day and 3 days dry groups were lower than those of control group (p>0.05). Conclusion: In this study, the repairs for resin denture base were remarkably high values of bonding strengths than those of the past, and showed that have stable bonding strengths independent of saliva absorption of denture base, so present repairs for resin denture base can be performed, regardless of saliva conditions.