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Monte Carlo 모의 및 수치해석 모형을 활용한 하천 유량 추정기법의 개발
강한솔,안현욱,김연수,허영택,노준우,Kang, Hansol,An, Hyunuk,Kim, Yeonsu,Hur, Youngteck,Noh, Joonwoo 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.4
Since the frequency of heavy rainfall is increasing due to climate change, water levels in the river exceed past historical records. The rating-curve is to convert water level into flow dicscharge from the regression analysis of the water level and corresponding flow discharges. However, the rating-curve involves many uncertainties because of the limited data especially when observed water level exceed past historical water levels. In order to compensate for insufficient data and increase the accuracy of flow discharge data, this study estimates the flow discharge in the river computed mathematically using Monte Carlo simulation based on a 1D hydrodynamic numerical model. Based on the existing rating curve, a random combination of coefficients constituting the rating-curve creates a number of virtual rating curve. From the computed results of the hydrodynamic model, it is possible to estimate flow discharge which reproduces best fit to the observed water level. Based on the statistical evaluation of these samples, a method for mathematically estimating the water level and flow discharge of all cross sections is porposed. The proposed methodology is applied to the junction of Yochoen Stream in the Seomjin River. As a result, it is confirmed that the water level reproducibility was greatly improved. Also, the water level and flow discharge can be calculated mathematically when the proposed method is applied.
호박 유전자원의 생육 특성 평가와 KASP 마커를 이용한 유전적 다양성 분석
강한솔,정우진,배익현,최윤서,신나리 한국국제농업개발학회 2023 韓國國際農業開發學會誌 Vol.35 No.3
세계적으로 널리 재배되는 호박 중, 199점의 C. moschata, C. maxima와 C. pepo 호박 유전자원을 대상으로 14가지의생육 특성을 파악하고 PCA 분석을 수행하였다. 199점의 호박 유전자원에 대해 각 염색체당 1개 이상의 마커를 임의로 선발하여 자원 분류를 진행하였다. 그 결과, C. moschata 92점은 5그룹, C. maxima 34점은 5그룹, C. pepo 73점은 4그룹으로 분류되는 경향을 보였으며, 이를 통해 유전자원의 근연 관계를 파악하고 종자산업진흥센터에서 제공받은KASP 마커를 활용하여 유전적 다양성을 확인할 수 있었다.
로봇 잔류 진동 저감을 위한 모션 가감속 시간 설계 연구
강한솔,정성엽,황면중 한국로봇학회 2017 로봇학회 논문지 Vol.12 No.3
In this paper, we proposed a method to determine the acceleration/deceleration time of the motion for reducing the residual vibration caused by the resonance of the robot in the high-speed motion. The relationship between the acceleration/deceleration time and the residual vibration was discussed for the trapezoidal velocity profile by analyzing the time when the jerk happens. The natural frequency of the robot can be estimated in advance through the dynamics simulation. The simulation and experiment for both cases where the moving distance of the robot is long enough and the distance is short, are implemented in the 1-DOF linear robot. Simulation and experimental results show that when the acceleration/deceleration time is a multiple of the vibration period, the settling time and the amplitude of the residual vibration become less than when the time is not a multiple.
대퇴-대퇴동맥 우회 인조혈관 폐색에서 AngioJet Rheolytic Thrombectomy System과 색전보호기구를 이용한 혈전제거술: 증례 보고
강한솔,이상준,송순영,김응태,고성은,박성민 대한영상의학회 2021 대한영상의학회지 Vol.82 No.2
The authors report a successful thrombectomy using the AngioJet Rheolytic Thrombectomy System (AngioJet) and an embolic protection device in a patient with femorofemoral bypass graft occlusion. Lower extremity CT angiograms showed occlusion in the left-to-right femorofemoral bypass graft. A rheolytic thrombectomy using the AngioJet and balloon angioplasty restored blood flow to the right lower extremity, and distal embolization may be effectively prevented by placing an embolic protection device within the right superficial femoral artery during the procedure. 저자들은 대퇴-대퇴동맥 우회 인조혈관 폐색 환자에서 AngioJet Rheolytic Thrombectomy System (이하 AngioJet)과 색전보호기구를 이용하여 성공적으로 혈전제거술을 시행한 1예를 보고하고자 한다. 하지 혈관 전산화단층촬영에서 좌측에서 우측으로의 대퇴-대퇴 우회 인조혈관 폐색 소견을 보였다. AngioJet을 이용한 흐름 용해 혈전제거술과 풍선 혈관성형술을시행하여 우측 하지 혈류를 재개통 시켰으며, 시술 중 우측 표재성 대퇴동맥에 색전보호기구를 거치시켜 효과적으로 원위부 색전을 예방할 수 있었다.
텍스트 피쳐 추출 방식에 따른 음식점 거짓리뷰 탐지성능 비교분석
강한솔,윤성욱 대한전기학회 2020 전기학회논문지 Vol.69 No.6
Blog reviews about restaurants may have a great influence on the customers’ choice as the use of social network services (SNS) increases. Thus, few restaurant owners bribe to post fake positive reviews on the social networking sites, which can fool many customers. Since the number of the fake reviews increases sharply, detecting the fake reviews become important to protect customers. In this paper, we detected the fake reviews by using the similarity between other fake reviews. To analyze the similarity of the review contents, we use feature extraction algorithms from the documents. Specifically, we compared performance of three different feature extraction algorithms: Term Frequency (TF), Term Frequency Inverse Document Frequency (TF-IDF), and doc2vec. – doc2vectakes accounts for the meaning of keywords in the documents similarly that famous word2vec algorithm does, while TF and TF-IDF only consider the occurrence of the keywords. Accordingly, doc2vec demonstrated the best performance in detecting the fake reviews.
강한솔,고윤호 한국멀티미디어학회 2019 멀티미디어학회논문지 Vol.22 No.12
This paper proposes a novel active stereo matching technique using white auxiliary stripe pattern. The conventional active stereo matching techniques that uses two cameras and an active source such as projector can accurately estimate disparity information even in the areas with low texture compared to the passive ones. However, it is difficult that the conventional active stereo matching techniques using color code patterns acquire these patterns robustly if the object is composed of various colors or is exposed to complex lighting condition. To overcome this problem, the proposed method uses an additional white auxiliary stripe pattern to get and localize the color code patterns robustly. This paper proposes a process based on adaptive thresholding and thinning to obtain the auxiliary pattern accurately. Experimental results show that the proposed method more precisely measures the stepped sample whose depth is known in advance than the conventional method.
유비쿼터스 환경이 정보시스템 활용도에 미치는 영향에 관한 연구
강한솔,이욱 한국경영정보학회 2007 한국경영정보학회 학술대회논문집 Vol.2007 No.-
기존의 연구에서는 유비쿼터스에 대한 개념적인 내용에 많은 비중을 두었지만 유비쿼터스의 개념이 널리 알려지고 실제로 적용이 되어지고 있는 최근의 상황에서는 보다 실증적이고 구체적인 연구결과가 있어야 한다. 본 연구는 유비쿼터스(Ubiquitous) 환경이 급속도로 발전하고 있는 상황에서 기존 정보시스템의 문제점을 알아보고 이에 대한 해결책으로서 유비쿼터스 환경이 어떠한 영향을 미치는 지에 대해 연구 하고자 한다.