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비대칭 왜곡 어안렌즈를 위한 영상 손실 최소화 왜곡 보정 기법
조영주,김성희,박지영,손진우,이중렬,김명희,Cho, Young-Ju,Kim, Sung-Hee,Park, Ji-Young,Son, Jin-Woo,Lee, Joong-Ryoul,Kim, Myoung-Hee 한국시뮬레이션학회 2010 한국시뮬레이션학회 논문지 Vol.19 No.1
Due to the fact that fisheye lens can provide super wide angles with the minimum number of cameras, field-of-view over 180 degrees, many vehicles are attempting to mount the camera system. Not only use the camera as a viewing system, but also as a camera sensor, camera calibration should be preceded, and geometrical correction on the radial distortion is needed to provide the images for the driver's assistance. In this thesis, we introduce a geometric correction technique to minimize the loss of the image data from a vehicle fish-eye lens having a field of view over $180^{\circ}$, and a asymmetric distortion. Geometric correction is a process in which a camera model with a distortion model is established, and then a corrected view is generated after camera parameters are calculated through a calibration process. First, the FOV model to imitate a asymmetric distortion configuration is used as the distortion model. Then, we need to unify the axis ratio because a horizontal view of the vehicle fish-eye lens is asymmetrically wide for the driver, and estimate the parameters by applying a non-linear optimization algorithm. Finally, we create a corrected view by a backward mapping, and provide a function to optimize the ratio for the horizontal and vertical axes. This minimizes image data loss and improves the visual perception when the input image is undistorted through a perspective projection.
Young Ju Cho(조영주),Yong Jung Kwon(권용중),Sunghwan Jin(진성환),Hyeunseok Choi(최현석),Jung-Hoon Lee(이정훈),Seung-Min Yang(양승민),Sun-Woo Choie(최선우),Young Kyu Jeong(정영규) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.5-1
In humid conditions, water vapor can easily neutralize the surface active sites of metal oxide sensors, leading to a lowering in the sensitivity of the gas sensor and a resultant inaccurate signal in practical applications. Herein, we present a new hybrid sensor by introducing a two-dimensional calcium silicate (CS) nanosheet as a water- trapping layer in SnO2 nanowires. Unlike the heavily wrinkled and aggregated morphology of conventional CS nanosheets, our nanosheet in the hybrid material is ultrathin and flat. Moreover, it was grown in the empty spaces between the spider-web-like networks of SnO2 nanowires without covering the nanowire surface. These two morphological features improve moisture trapping with minimal reduction in the active sensing area. Consequently, stable and sensitive gas detection under humid conditions was achieved in this hybrid sensor. The superior humidity-independent sensing is ascribed to the preferential adsorption of water molecules on hydroscopic CS nanosheets through the hydrogen bond. Based on density functional theory calculations, we deter- mined that the improved gas response is driven by the additional formation of oxygen vacancy in SnO2 due to the diffusion of aliovalent Ca ions from the CS nanosheet.
라미부딘 내성 만성 B형간염 환자에서 아데포비어 단독요법 후 라미부딘 추가투여의 효과
조영주 ( Young Ju Cho ),정재연 ( Jae Youn Cheong ),이명희 ( Myoung Hee Lee ),전수진 ( Su Jin Jeon ),이윤철 ( Yoon Chul Lee ),임선교 ( Sun Gyo Lim ),강창준 ( Chang Joon Kang ),조성원 ( Sung Won Cho ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.2
Background/Aims: Add on adefovir (ADV) to ongoing lamivudine (LAM) has been recommended as a standard therapy for the treatment of LAM resistance. In the past, switch to ADV monotherapy was suggested as an option for the treatment of LAM resistance, leading to frequent development of ADV resistance. However, ADV monotherapy has been still used in LAM-resistant patients because of low cost in Korea. The aims of this study were to evaluate the virologic response and virologic breakthrough during adding on LAM in LAM-resistant patients receiving ADV monotherapy. Methods: The study population comprised 99 patients with LAM-resistance. We divided them into 3 groups (Group 1: switch to ADV monotherapy, N=58, Group 2: add on ADV to ongoing LAM, N=25, Group 3: add on LAM to ADV monotherapy, N=16). HBV DNA levels were assessed at baseline and every 3 months during therapy. Serum HBV DNA levels were measured by bDNA assay or the COBAS TaqMan(TM) HBV test. Results: The median treatment duration for group 1, group 2, and group 3 was 42.0, 20.6, and 31.8 (18.7 mon. of ADV+13.1 mon. of LAM) months, respectively. Cumulative rate of virologic breakthrough in group 1 was 5.2%, 19.0%, and 25.9% at 12, 24, and 36 months of treatment, respectively. Virologic breakthrough was not detected in group 2 and group 3 (p=0.016, group 1 vs. group 2 or 3). In group 3, median serum HBV DNA levels were 4.22 log(10) copies/mL prior to LAM administration. Median serum HBV DNA changes from baseline (log10 copies/mL) were ?0.91, ?1.93, ?1.87 and ?1.74 at week 12, 24, 36 and 48, respectively. Conclusions: Later add on LAM to ADV monotherapy prevented the development of ADV resistance in patients with LAM resistance effectively, comparable to ADV add on to continuing LAM therapy. (Korean J Gastroenterol 2010;56:83-89)
온 - 오프 모델을 이용한 일반 셀율 알고리듬의 매개변수 결정
이동섭(Dong-Seop Lee),조영주(Young-Ju Cho),허영희(Young-Hee Hur),심택수(Tack-Soo Sim),이주영(Ju-Young Lee),박창욱(Chang-Wouk Park),김영우(Young-Oo Kim),임인칠(In-Chil Lim) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.1
본 논문은 온-오프 모델을 이용하여 일반 셀을 알고리듬의 성능을 분석한다. 다중화되는 다른 트래픽의 양을 증가시키면 일반 셀을 알고리듬의 파라미터인 최대 셀율의 위반 확률은 증가하지만, 또 다른 파라미터인 지탱할 수 있는 셀율의 위반 확률은 일정하다. 또한, 약속을 위반한 셀들이 도착할 때 지탱할 수 있는 셀율은 평균 비트율에 가까울수록 좋은 성능을 보인다. 그리고, 약속을 지키는 셀들의 경우에는 평균 셀율보다 큰 값을 지탱할 수 있는 셀율로 선택할 때 셀 손실 확률을 감소시킨다.
좌측 가로정맥동과 에스자정맥동의 부재를 동반한 좌측 속경정맥의 선천성 폐쇄
조영주(Young Ju Cho),이경석(Kyung Suk Lee),황병언(Byung Eon Hwang),양윤수(Yun Su Yang),홍기환(Ki Hwan Hong) 대한두경부종양학회 2011 대한두경부 종양학회지 Vol.27 No.2
Knowledge of variations of veins of head and neck in relation to internal jugular ,external jugular, anterior jugular and facial veins is important to surgeons doing head and neck surgery as well as to radiologists doing catheterization and to clinicians in general. In the current case, congenital atresia of the left internal jugular vein is reported. During neck dissection, superficial veins of neck and left external jugular vein was engorged and the left internal jugular vein was look like a fibrotic band. The left common carotid artery and vagus nerve was normal.