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강정항 VTS 시스템 구축시 음영구역 최소화를 위한 레이더의 위치설정에 관한 연구
이승희 ( Seung-hi Lee ),김광일 ( Kwang-il Kim ),안장영 ( Jang-young Ahn ),이창헌 ( Chang-heon Lee ),최찬문 ( Chan-moon Choi ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.2
We have studied the efficient operation of the radar and the appropriateness of the installation location, when constructing the VTS system. As the Civil-Military Complex Harbour (Kangjeong Port) is completed in 2016, we set the control area within 10 nautical miles centering on Kangjeong Port, and found out and removed the operational radar blind area of VTS system to provide safe navigation information for vessels that navigating this area. Assuming that two international cruise ships entering at the same time, we performed the radar simulation and compared the images by considering the three sites of Kangjeong Port, Miaksan and Seoguipo Port. Simulation results for a single radar installed at Kangjung Port indicate that the blind area was largely affected by two large cruise ships and the surrounding islands. The blind area due to Kogunsan was considerably large when installed in Miaksan, but the blind area due to the influences of Beomseom, Moonseom and Seopseom was negligibly large. It seems that additional radar installation is necessary as a complementary solution to solve this blind area. When two radars were installed at Miaksan and Kangjeong Port, the residual blind area due to the Seopseom was 0.25 ㎢ at 0.1~0.33 nautical miles in the southeast direction from Seopseom. In addition, the remaining blind area with two cruise ships mutually influenced was 0.18 km2, which did not occur with a single cruise ship.
MPC-based active steering for autonomous vehicle systems
Young Ok Lee(이영옥),Chung Choo Chung(정정주),Seung-Hi Lee(이승희),Young Seop Son(손영섭) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, we present how model predictive control (MPC) is applied to lane keeping system (LKS). Due to a slow sampling rate of the vision system, the conventional LKS using single rate control may cause uncomfortable steering control rate in a high vehicle speed. By applying MPC to active steering, the proposed MPC-based active steering prevents undesirable oscillatory steering control command even at a vehicle speed of 30[㎧]. The effectiveness of the MPC is validated by simulation for the LKS equipped with a camera module having a slow sampling rate.
뇌경색 한방치료중 독성간염(약물유인성 간염)으로 추정되는 간기능 손상의 1례
이민수,송미덕,이승희,Lee, Min-Su,Song, Mi-Deok,Lee, Seung-Hi 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.5
Although there are a few reports concerning the hepatic injury of herbal medicine in western medicine, there is no reports concerning the hepatic injury of herbal medicine in oriental medicine. We experienced one case of the hepatic injury suggested toxic hepatitis (drug induced hepatitis) in the treatment of oriental medicine for cerebral infarction. We make a reports for the progress of treatment. One patient of Rt hemiparesis diagnosed cerebral infarction in Brain MRI was administered Taeumin Yuldahanso-tang, treated with physical therapy and improved in the state of Rt hemiparesis(Gr 2/3,4). In the course of treatment, the patient intermittently complained of general weakness, dizziness, pericephalic discomfort(頭不淸), nausea, both leg weakness so we changed Taeumin Yuldahanso-tang to Soyangin Dokwhaljiwhang-tang. Alter that, the patient complained of general weakness, abdominal discomfort, heat and fever($38.4^{\circ}C$). We recognized the elevated total bilirubin(1.7mg/dl), serum transaminase(AST534U/L ALT720U/L), serum gammg glutamyl transpepridase (GGT106mg/dl) and Alk phosphatase124U/L. In the abdominal ultrasonogram there is hepatomegaly (16.5cm). We supposed hepatic injury suggested toxic hepatitis(induced hepatitis) of herbal medicine. After we administered Saeng gan gunbi-tang for 2days and Alk phosphatase and GGT inadequately was elevated. After that, we stopped administering medicine and the serum transaminase, total bilirubin, serum gamma glutamyl transpeptidase and Alk phosphatase level was decreased. In the abdominal ultrasonogram there was no signal. In the case, we supposed that the changing Sasang constitution and Sasang herbal medicine may induce hepatic injury. We are suggesting the necessity of a test for the hepatic injury of herbal medicine.
실내 무인 자율 발렛파킹을 위한 Way-point 검출 및 경로 예측 방법
이다빈(Dabeen Lee),김승현(Seunghyun Kim),이승희(Seung-Hi Lee),정정주(Chung Choo Chung),김회율(Whoi-Yul Kim) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, we propose a way-point detection method for an autonomous valet parking system in an indoor environment where circular LED way-points are installed on the ceiling. As a pre-processing, camera‘s exposure value is automatically adjusted using incremental searching to remove other objects except way-points. We set binarization threshold using a standard deviation from Gaussian function modeled by background intensity distribution. For predicting the path where a vehicle is going to drive, the detected way-points are classified into "straight path class’ and "turning path class’ according to the its’ location, and the least square based line fitting is applied to each class. The experimental result using dataset captured in the indoor parking lot shows good performance of way-point detection and path estimation.
속도 프로파일 계획을 통한 영상 기반 차선 유지 및 변경 제어
최우영(Woo Young Choi),이승희(Seung-Hi Lee),정정주(Chung Choo Chung) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
In this paper, we propose vision sensor-based lane keeping and change control. Road coefficients obtained by the camera sensor are used to obtain state references for the vehicle dynamics model for lane keeping and change control. A lane change algorithm using reference velocity profile planning is proposed and verified through actual vehicle experiments. The proposed method is expected to be applied to autonomous vehicles to improve lane change performance.
손영섭(Young Seop Son),이승희(Seung-Hi Lee),이영옥(Young Ok Lee),정정주(Chung Choo Chung) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In the case of autonomous vehicles, it is practical to utilize camera and radar to detect front obstacle vehicles. By this we mean that such expensive scanners are hardly adopted in the automotive industry. Vision is also used for sensing road environment. Recent trends in the lane keeping/changing system research are using the vision system to obtain the road information. A multirate sensor fusion scheme is developed to achieve more accurate obstacle detection. The scheme uses a camera and radar is to present obstacle vehicle pose estimation at a fast period of controller.
이건일(Geon-Il Lee),강창묵(Chang Mook Kang),이승희(Seung-Hi Lee),정정주(Chung Choo Chung) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.11
Assigning the correspondences among moving objects, which are measured from two different sensors such as radar and vision, is difficult when the ego vehicle is changing its lane. In this paper, we propose a robust and reliable decision method of the correspondences between radar and vision when the ego vehicle is changing its lane. A particle filter that consider the yaw rate of the ego vehicle and a convex hull method are proposed to improve the object ID association. In addition, the overall architecture of sensor fusion is described with the proposed association method. The proposed methods have been validated in actual vehicle experiments. The test results show that the proposed algorithm can effectively associate the objects from two different sensors on Yeoju smart highway with the minimum curvature radius of 1,124m and a lane width of 3.5m in the lane-changing situation.
Sarracenia purpurea에서 빛 및 질소 의존성 anthocyanin 생합성
윤준섭(Joon Sup Yoon),이승희(Seung hi Lee),유영선(Young Sun Riu),공삼근(Sam-Geun Kong) 한국생명과학회 2019 생명과학회지 Vol.29 No.10
식충식물(carnivorous plant)인 Sarracenia purpurea는 생육에 있어 매우 높은 수준의 광량을 필요로 하며 색, 과즙 등으로 벌레를 유인하여 영양분을 흡수하는 것으로 알려져 있다. S. purpurea는 약한 빛 조건에서 녹색을 띄었으며 강한 빛 조건에서는 잎을 포함한 포충낭 전체가 검붉은 색으로 변화하였다. 이와 같은 색의 변화는 질소비료를 첨가하였을 때에 관찰되지 않았다. S. purpurea를 붉게 물들이는 색소는 안토시아닌(anthocyanin)인 것으로 보고된 바가 있다. 본 연구에서는 빛의 세기와 질소 첨가에 따른 안토시아닌의 함량과 생합성 관련 유전자의 발현 특성을 분석하였다. 240 μmol m<SUP>-2</SUP> s<SUP>-1</SUP>의 강한 빛 조건에서의 안토시아닌 함량은 40 μmol m<SUP>-2</SUP> s<SUP>-1</SUP>의 약한 빛에서 보다 6.15배 높았으며, 0.8% 요소 비료로 질소를 첨가하였을 때에는 약한 빛 조건과 큰 차이가 없었다. 안토시아닌의 초기 생합성 과정에 관여하는 CHALCONE SYNTHASE (CHS) 유전자는 강한 빛에서 발현이 증가하였고 질소 양분을 첨가하였을 때에 감소하였다. 이상의 결과는 빛과 토양의 환경 변화가 S. purpurea의 안토시아닌의 함량을 조절한다는 것을 보여주고 있다. Sarracenia purpurea as a carnivorous plant in the family Sarraceniaceae is known to require strong light for its growth and to absorb nutrients from the decomposed molecules of insects that are attracted by color, sweet juice, and the like. S. purpurea grew greenish in whole body under weak light conditions, while the whole of the insectivorous sac including leaves, is changed to dark red under strong light conditions. The phenomenon of reddish S. purpurea is thought to be related to the flavonoid pigment anthocyanin. Interestingly, the color change was not observed when S. purpurea was grown in a growth condition with abundant nitrogen fertilizer. The expression levels of anthocyanin contents and biosynthesis-related genes were strongly correlated with light intensity and nitrogen fertilizer. The anthocyanin content in the strong light condition (240 μmol m<SUP>-2</SUP> s<SUP>-1</SUP>) was 6.15 times higher than that in the weak light (40 μmol m<SUP>-2</SUP> s<SUP>-1</SUP>). In contrast, the anthocyanin contents were not significantly changed when 0.8% urea solution was supplied as nitrogen fertilizer. Consistently, CHALCONE SYNTHASE (CHS) gene was up-regulated by strong light and down-regulated by nitrogen fertilizer. These results suggest that the environmental changes of light and nitrogen in soil regulate the anthocyanin content in S. purpurea.