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세계를 가다 - 음식의 천국, 과거와 현재가 공존하는 영혼의 나라 - 인도
이동천,Lee, Dong-Cheon 한국식품산업협회 2015 좋은식품 Vol.247 No.-
인도의 정식명칭은 인도공화국(Republic of India)이며, 힌디어(語)로는 바라트(Bharat)라고 한다. 서쪽으로 파키스탄, 북동쪽으로 중국 네팔 부탄, 동쪽으로 방글라데시 미얀마와 국경을 접한다. 파키스탄과는 독립 당시부터 카슈미르 지역을 둘러싼 영토분쟁을 벌여왔다. 아시아 문명의 원천으로 불교가 발상한 곳이다. 국명은 산스크리트어(語)로 된 인더스강(江)의 이름에서 유래했다. 국토면적은 세계 7위이며, 인구는 세계 2위이다. 행정구역은 28개주와 7개 연합주로 되어 있다.
Automatic Building Reconstruction with Satellite Images and Digital Maps
이동천,염재홍,신성웅,오재홍,박기석 한국전자통신연구원 2011 ETRI Journal Vol.33 No.4
This paper introduces an automated method for building height recovery through the integration of high-resolution satellite images and digital vector maps. A cross-correlation matching method along the vertical line locus on the Ikonos images was deployed to recover building heights. The rational function models composed of rational polynomial coefficients were utilized to create a stereopair of the epipolar resampled Ikonos images. Building footprints from the digital maps were used for locating the vertical guideline along the building edges. The digital terrain model (DTM) was generated from the contour layer in the digital maps. The terrain height derived from the DTM at each foot of the buildings was used as the starting location for image matching. At a preset incremental value of height along the vertical guidelines derived from vertical line loci, an evaluation process that is based on the cross-correlation matching of the images was carried out to test if the top of the building has reached where maximum correlation occurs. The accuracy of the reconstructed buildings was evaluated by the comparison with manually digitized 3D building data derived from aerial photographs.
5축 CAM 가공 작업 프로세스 개선을 위한 가공 템플릿 활용
이동천,김선용,Lee, Dong-Cheon,Kim, Seon-Yong 한국금형공학회 2017 한국금형공학회지 Vol.11 No.1
Currently, a lot of efforts to make increases the manufacturing efficiency have tried and there is growing the interest to implementing the machining operation through CAM automation and optimization. This kind of movement has shown gradually in 5X milling as well as 3X milling task. By the way, in case of 5X milling, it is difficult to hire the CAM experts who is an experience for 5X machining and also it has too big trouble to use them due to high cost. For this reason, you can see the manufacturer who is concern the CAM S/W to provide the NC automation program that beginners can generate easily the 5X milling in short term and the existing 5X milling process can be improved. These requirements need to make a NC automation process including the practical machining strategies same as the generation by NC expert. In order to support this, it is necessary to directly apply the 3D machining part based on NC template which includes the machining procedures, standard cutter library, auto machine area selection, analyze tool for part shape, machining condition setting considering the material stiffness to be provided by CimatronE and it should be created the 5axis machining data by a minimized operation. With user-friendly, CimatronE's NC machining automation tools improve the 5-axis machining process and speed up the process, maximizing work efficiency and improving product productivity compared to existing machining tasks.
세계를 가다 - 시큼, 달콤, 쌉싸름, 세계를 정복하다 - 베트남 커피편
이동천,Lee, Dong-Cheon 한국식품산업협회 2015 좋은식품 Vol.246 No.-
정식명칭은 베트남 사회주의공화국(Socialist Republic of Vietnam)이다. 북쪽은 중국과, 서쪽은 라오스 및 캄보디아와 접하고 동쪽은 바다를 면하고 있다. 남북으로 긴 해안선은 무려 3,444Km에 달한다. 면적은 33만 $1,210km^2$, 인구는 9,200만 명, 수도는 하노이(Hanoi)이다. 주민은 베트남인이 90% 이상을 차지하고 있으며, 그 밖에 중국인과 53개의 소수민족으로 구성되어 있다. 공용어는 베트남어이며, 종교는 불교가 80%, 가톨릭교가 9% 등이다. 행정구역은 하노이, 호찌민, 다낭, 하이퐁, 껀터의 5개 직할시(centrally administered city)와 59개의 성(省)으로 이루어져 있다.
이동천,정형섭,염재홍 한국측량학회 2007 한국측량학회지 Vol.25 No.6-1
Segmentation and organization of the LiDAR (Light Detection and Ranging) data of the Earth’s surface are difficult tasks because the captured LiDAR data are composed of irregularly distributed point clouds with lack of semantic information. The reason for this difficulty in processing LiDAR data is that the data provide huge amount of the spatial coordinates without topological and/or relational information among the points. This study introduces LiDAR data segmentation technique by utilizing histograms of the LiDAR height image data and analyzing roof shape for 3D reconstruction and visualization of the buildings. One of the advantages in utilizing LiDAR height image data is no registration required because the LiDAR data are geo-referenced and ortho- projected data. In consequence, measurements on the image provide absolute reference coordinates. The LiDAR image allows measurement of the initial building boundaries to estimate locations of the side walls and to form the planar surfaces which represent approximate building footprints. LiDAR points close to each side wall were grouped together then the least-square planar surface fitting with the segmented point clouds was performed to determine precise location of each wall of an building. Finally, roof shape analysis was performed by accumulated slopes along the profiles of the roof top. However, simulated LiDAR data were used for analyzing roof shape because buildings with various shapes of the roof do not exist in the test area. The proposed approach has been tested on the heavily built-up urban residential area. 3D digital vector map produced by digitizing complied aerial photographs was used to evaluate accuracy of the results. Experimental results show efficiency of the proposed methodology for 3D building reconstruction and large scale digital mapping especially for the urban area.