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Mobile GCS를 이용한 Network RTK 기반 경계 복원 측량 드론
정은지,장민석,이연식,Jeong, Eun-ji,Jang, Min-seok,Lee, Yon-sik 한국정보통신학회 2021 한국정보통신학회논문지 Vol.25 No.12
우리나라 토지공부는 일제 시대의 낙후된 기술로 정립되어 현재 국내 토지의 15%가 지적도와 맞지 않는다. 이에 정부는 '지적재조사 사업'이라는 이름 아래 우리나라 토지공부를 정립하고 측량 원점을 세계측지계로 변경 중에 있다. 지적재조사 사업이 끝난 후 우리나라 디지털 정보 서비스가 구축되어 디지털 지적정보가 제공될 때, 그 정보를 이용하여 손쉽게 측량할 수 있는 드론 경계 복원 측량 방법을 제안한다. Mobile GCS는 모바일 어플로 드론을 제어하고 토지공부에 기록된 경계점 좌표를 획득하여 드론이 자동 비행하여 경계점을 표시하도록 한다. 개발한 프로토타입 드론으로 6개 경계점을 2분 내로 순회하였다. The cadastre in Korea was established with the outdated technology of the Japanese colonial period, and thus currently 15% of the Korea domestic land does not match the cadastral map. Accordingly, the government has been establishing the Korean cadastre under the name of 'Cadastral Re-investigation Project' and is changing the origin of the survey to the world geodetic system. Assuming that the project is completed, we propose a drone boundary survey method that can be used to easily survey using the exact digital cadastral information. The developed mobile GCS application can control the drone and acquire the boundary point coordinates recorded in the cadastre, and the drone automatically flies to mark the boundary points. The developed prototype of drone made a tour along the 6 boundary points in 2 minutes.
정은지,William R. Freeman,Stanley P. Azen,이효,고형준 연세대학교의과대학 2008 Yonsei medical journal Vol.49 No.6
Purpose: To compare the efficacy of posterior sub-Tenon’s capsule triamcinolone acetonide injection combined with modified grid macular photocoagulation (PSTI+MP) with intravitreal triamcinolone acetonide (IVTA) injection in the treatment of diffuse diabetic macular edema (DME). Materials and Methods: Forty eyes of 33 patients with diffuse DME were randomly allocated into either PSTI+MP (20 eyes) or IVTA (20 eyes). Best corrected visual acuity (VA) and foveal thickness were measured. Results: The ETDRS scores at baseline were 25.2±13.6 (mean±SD) letters in the PSTI+ MP group, whereas 21.7±16.3 letters in the IVTA group. The ETDRS scores improved by 33.2±15.9, 34.7±16.6 and 30.9 ±19.0 letters in the PSTI + MP group whereas by 30.9±15.4, 30.1±17.9 and 31.5±15.0 letters in the IVTA group at 1, 3, and 6 months after the treatments, respectively. The VA improved significantly at 1 month and 3 months after both treatments (all p<0.02, paired t-test). The VA improvements were no longer significant at 6 months in either group. There were no statistically significant differences at any time points between the 2 groups (all p>0.05, Student’s t-test). The foveal thicknesses at baseline and 1, 3, and 6 months after the treatments were 382.8±148.3, 309.1±131.3, 319.3±93.3, 340.4±123.5μm (mean±SD) in the PSTI+MP group vs. 369.1±123.1, 241.4 ±52.3, 277.5±137.4, 290.2±127.9μm in the IVTA group, respectively. Pairwise comparisons revealed significant decrease in foveal thickness at 1 month (p=0.01, paired t-test) for the PSTI+MP group, and at both 1 month (p<0.001) and 3 months (p=0.016) for the IVTA group. There were no statistically significant differences at any time points between the 2 groups (all p>0.05, Student’s t-test). In contrast to the PSTI+MP group, where no complications were noted, the elevation of intra-ocular pressure in 3 of 20 eyes (15%) and a significant increase in average cataract grading were observed in the IVTA group. Conclusion: PSTI+MP treatment provides significant improvement of vision in patients with diffuse DME over 3 months, and achieves outcomes comparable to those after IVTA treatment, however, with fewer complications.