http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강변저류지 횡월류부의 흐름 형태 변화를 고려한 HEC-RAS의 하도 내 부정류 모의 정확도 분석
김상혁,윤병만,김동수,김서준,Kim, Sanghyuk,Yoon, Byungman,Kim, Dongsu,Kim, Seojun 한국수자원학회 2016 한국수자원학회논문집 Vol.49 No.1
강변저류지를 홍수방어대책에 포함시키기 위해서는 정확한 홍수조절효과 산정이 필요하며, 이를 위해 현재 실무에서는 1차원 부정류 수치모형인 HEC-RAS를 사용하고 있다. 그러나 강변저류지의 저류용량이 부족한 경우에 발생하는 잠긴 횡월류 흐름에 대해서는 HEC-RAS 부정류 수치모의의 정확도 분석이 수행되지 않았다. 따라서 본 연구에서는 직선수로에 강변저류지를 설치한 경우에 대하여 횡월류부의 다양한 흐름 형태를 재현할 수 있는 부정류 수리실험을 수행하였다. 또한 부정류 수리실험 결과를 이용하여 HEC-RAS 모형의 부정류 수치모의 결과의 정확도를 분석하여 하도 내 수위 오차 및 강변저류지의 홍수조절효과 산정 오차를 제시하였다. 분석 결과 횡월류부에서 잠긴 횡월류 흐름이 발생하는 경우에 대한 HEC-RAS의 수위 계산 결과는 최대 -5% 오차를 보였으며, 홍수조절효과 오차는 최대 2.4%로 나타나 HEC-RAS의 부정류 모의 결과가 비교적 정확한 것을 확인하였다. Accurate quantitative assessment of flood control effect of side-weir detention basin as a flood countermeasure was highly required, in which one-dimensional HEC-RAS model has been widely utilized in practice. When the submerged overflow occurred particularly driven by limited storage capacity of a given detention basin, HEC-RAS model could not be sufficiently applicable by guaranteeing acceptable accuracy without reliable benchmark dataset. From this perspective, a dedicated unsteady experiment was planned and carried out to physically realize such submerged overflow for accommodating better accuracy. Subsequently, the experimental results were applied to validate and calibrate HEC-RAS unsteady modeling to provide flood control effect of the detention basin for various inflow scenarios. After following this procedure, the modelled results indicated that there appeared within -5% of difference in stage height and maximum 2.4% accuracy to assess the flood control effect, thereby ensuring the calibrated HEC-RAS unsteady model to be accurate with practically acceptable error range.
머신 러닝을 이용한 영상 특징 기반 전기차 검출 및 분류 시스템
김상혁(Sanghyuk Kim),강석주(Suk-Ju Kang) 대한전기학회 2017 전기학회논문지 Vol.66 No.7
This paper proposes a novel way of vehicle detection and classification based on image features. There are two main processes in the proposed system, which are database construction and vehicle classification processes. In the database construction, there is a tight censorship for choosing appropriate images of the training set under the rigorous standard. These images are trained using Haar features for vehicle detection and histogram of oriented gradients extraction for vehicle classification based on the support vector machine. Additionally, in the vehicle detection and classification processes, the region of interest is reset using a number plate to reduce complexity. In the experimental results, the proposed system had the accuracy of 0.9776 and the F₁ score of 0.9327 for vehicle classification.
김상혁(Sanghyuk Kim) 한국중원언어학회 2016 언어학연구 Vol.0 No.38
The purpose of this study was to suggest useful principles of English Syntax to English teachers when teaching secondary students English complements and adjuncts. In order to achieve this purpose, we critically reviewed the five forms of the English predicate of Onions (1904). As the result of the review, we found out some problems in his classification: He excluded adverbial phrases and prepositional phrases from the complement category. This is a serious problem because in some sentences they can be complements too. We compared Onions (1904) with Hornby (1975), Stageberg (1981), Quirk et al. (1985), and Downing A. & Locke P. (1992), and reached the conclusion that adverbial phrases and prepositional phrases can be essential elements in some sentences, which can be called complements. When English teachers educate English adverbials, they can use the terms of a complement, an adjunct, an argument, and a subcategorization of English syntax. It is probable that we proved these could be very helpful for English teachers to teach English complements and adjuncts, thus facilitating students to understand English complements and adjuncts more easily.