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나미선(Mi Sun Na),고연석(Yun Suk Ko),양소은(So Eun Yang),서영범(Yung Bum Seo) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
Fiber identification was attempted for the early twenty century documents that were classified as national archives in Korea, as an initial step for establishing scientific preservation and restoration method. Fiber staining with C stain and a digital microscope were used for the observation. All the documents observed consisted of mostly softwood fibers from fir (Abies) and other minor supplementary fibers, and they were all deteriorated seriously by various damages and aging process. It seemed that at around 1914-1934, fir was used frequently as papermaking raw material.
이수현(Su Hyun Lee),나미선(Mi-Sun Na),여상원(Sang Won Yeo),박시내(Shi Nae Park) 대한두개저학회 2015 대한두개저학회지 Vol.10 No.1
Iatrogenic temporal bone meningoencephalocele (MEC) through the defect site of tegmen can be occurred after the surgical procedure of mastoidectomy even though its clinical manifestations and prognosis are not well known till now. Six years ago, the patient underwent canal wall up mastoidectomy due to chronic otitis media and had a 5mm in diameter iatrogenic loss of dural plate without any direct dural injury during the surgery. Recurrence of chronic otitis media led him to take reoperation. He did not show any cranial nerve symptoms or signs but preoperative temporal bone computed tomogram demonstrated suspicious MEC in the mastoid cavity. Here, we report a case of asymptomatic but clinically important iatrogenic MEC.
3D 형상정보 자동 수집을 위한 구면좌표계식 스캐닝 시스템
박상욱(Sang Wook Park),맹희영(Hee-young Maeng),이명상(Myoung Sang Lee),권길선(Kil Sun Kwon),나미선(Mi-Sun Na) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.9
3D 스캐닝을 이용한 3D 형상정보를 구축하기 위해서는 피측정물의 촬영부터 시작하여 획득된 데이터의 합성과정까지 여러 단계를 거치는데, 이는 많은 시간과 복잡하며 번거로운 수작업을 요구한다. 본 연구에서는 복잡하고 많은 시간이 소요되는 과정에서 생기는 불필요한 준비과정이나 진행단계별 수작업요소들을 자동화하여 작업자의 숙련도에 따라 발생하는 데이터 품질의 차이를 최소화 할 수 있도록 하였으며, 작업자의 실수로 인해 발생하는 데이터의 부재를 사전에 예방 할 수 있어 결과적으로 3D 스캐너를 통한 3 차원데이터 획득과정의 시간적, 데이터적 효율성과 형상정밀도를 증가시킴을 증명하였다. Several types of automatic 3D scanners are available for use in the 3D scanning industry, e.g., an automatic 3D scanner that uses a robot arm and one that uses an automatic rotary table. Specifically, these scanners are used to obtain a 3D shape using automatic assisting devices. Most of these scanners are required to perform numerous operations, such as merging, aligning, trimming, and filling holes. We are interested in developing an automatic 3D shape collection device using a spherical-coordinate-based guiding system. Then, the aim of the present study is to design an automatic guiding system that can automatically collect 3D shape data. We develop a 3D model of this system and measuring data which are collected by a personal computer. An optimal design of this system and the geometrical accuracy of the measured data are both evaluated using 3D modeling software. The developed system is then applied to an object having a highly complex shape and manifold sections. Our simulation results demonstrate that the developed system collects higher-quality 3D data than the conventional method.