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이대건(Lee, Dae Geon),이동천(Lee, Dong-Cheon) 한국측량학회 2020 한국측량학회 학술대회자료집 Vol.2020 No.7
Object recognition and classification are important in high-level image processing such as computer vision and machine learning. Detection, recognition, identification, and classification are sequential and progressive learning procedures. However, implementation of human-like learning mechanism using artificial neural network (ANN) with limited training data is challenging task. This paper proposes deep learning for land cover classification using shaded relief maps created from DSM as training data sets. The results show that the derived feature information from original data increases number of training data and improves performance of ANN.
ORFEUS OBSERVATIONS OF ULTRAVIOLET EXCITED HIGH-J MOLECULAR HYDROGEN
Lee, Dae-Hee,Dixon, W. Van Dyke,Min, Kyoung-Wook,Pak, Soo-Jong The Korean Astronomical Society 2009 Journal of The Korean Astronomical Society Vol.42 No.6
We present measurements of diffuse interstellar $H_2$ absorption lines in the continuum spectra of 10 early-type stars. The data were observed with the Berkeley Extreme and Far-Ultraviolet Spectrometer (BEFS) of the ORFEUS telescope on board the ORFEUS-SPAS I and II space-shuttle missions in 1993 and 1996, respectively. The spectra extend from the interstellar cutoff at 912 $\AA$ to about 1200 $\AA$ with a resolution of ~ 3000 and statistical signal-to-noise ratios between 10 and 65. Adopting Doppler broadening velocities from high-resolution optical observations, we obtain the $H_2$ column densities of rotational levels J" = 0 through 5 for each line of sight. The kinetic temperatures derived from J" = 0 and 1 states show a small variation around the mean value of 80 K, except for the component toward HD 219188, which has a temperature of 211 K. Based on a synthetic interstellar cloud model described in our previous work, we derive the incident UV intensity IUV and the hydrogen density $n_H$ of the observed components to be -0.4 $\leq$ log $I_{UV}\leq2.2$ and $6.3{\leq}n_H2500cm^{-3}$, respectively.
Transduodenal ampullectomy for ampullary tumors-single center experience of consecutive 26 patients
Sarang Hong,Ki Byung Song,Young-Joo Lee,Kwang-Min Park,Song Cheol Kim,Dae Wook Hwang,Jae Hoon Lee,Sang Hyun Shin,Jaewoo Kwon,Chung Hyeun Ma,Seunghyun Hwang,Guisuk Park,Yejong Park,Seung Jae Lee,Yong W 대한외과학회 2018 Annals of Surgical Treatment and Research Vol.95 No.1
Purpose: Transduodenal ampullectomy (TDA) has been reported in a limited number of cases and in a small number of case series. The aim of this study was to analyze perioperative and long-term oncological outcomes of patients with ampullary tumors who underwent TDA in a single large-volume center. Methods: Through a retrospective review of data from 2004 to 2016, we identified 26 patients who underwent TDA at Asan Medical Center. Results: Eleven of 26 patients underwent TDA for T1 and carcinoma in situ (high-grade dysplasia) cancer; these patients are still alive without recurrence. A major in-hospital complication (3.8%) occurred in 1 case, but there was no case of 90-day mortality. In addition, none of the patients was diagnosed as having newly developed diabetes mellitus after TDA. No significant differences were found between open and laparoscopic-TDA in terms of operation time, painkiller use, and hospital stay. Conclusion: TDA is a feasible and effective surgical procedure for the treatment of selected patients with ampullary tumors. It is an alternative treatment option in cases of ampullary tumors not amenable to endoscopic papillectomy or pancreaticoduodenectomy.