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조윤상(Yoon Sang Cho),남보우(Bo Woo Nam),홍사영(Sa Young Hong),김진하(Jin Ha Kim),김현조(Hyun Jo Kim) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.6
A numerical method to investigate the non-linear motion characteristics of a TLP is established. A time domain simulation that includes the memory effect using the convolution integral is used to consider the transient effect of TLP motion. The hydrodynamic coefficients and wave force are calculated using a potential flow model based on the HOBEM(higher order boundary element method). The viscous drag force acting on the platform and tendons is also considered by using Morison’s drag. The results of the present numerical method are compared with experimental data. The focus is the nonlinear effect due to the viscous drag force on the TLP motion. The ringing, springing, and drift motion are due to the drag force based on Morison’s formula.
서영거(Young Ger Suh),김화순(Hwa Soon Kim),조윤상(Yoon Sang Cho) 대한약학회 1989 약학회지 Vol.33 No.4
In connection with the synthesis of the biologically active pimarane diterpenoids, some synthetic routes to the quaternary carbon unit were examined. Especially, Claisen rearrangement of allyl acetates prepared from acetol provided gamma-hydroxy acid containing vinyl substituent as the desired unit.
Macrolide의 새로운 합성 -8-Membered Lactone의 합성-
서영거(Young Ger Suh),구본암(Bon Am Koo),조윤상(Youn Sang Cho) 대한약학회 1990 약학회지 Vol.34 No.3
An efficient synthetic route to macrolide is described. Eight-membered lactone was synthesized via palladium catalyzed intramolecular alkylation of allylic carbonate in high yield.
금속촉매를 이용한 Carbocycle의 합성(II) -Cycloheptane의 합성-
서영거(Young Ger Suh),원숙란(Sug Lan Won),최남송(Nam Song Choi),조윤상(Youn Sang Cho) 대한약학회 1991 약학회지 Vol.35 No.4
An efficient synthetic route to carbocycle is described. 1,1,2-Trisubstituted cycloheptane has been synthesized from allylic carbonate by Pd(O) catalzyed cyclization.
금속 촉매를 이용한 Carbocycle의 합성(I) Pd(0) 촉매를 이용한 Cyclopentane의 입체선택적 합성
서영거(Young Ger Suh),이기호(Gi Ho Lee),조윤상(Youn Sang Cho) 대한약학회 1990 약학회지 Vol.34 No.5
An efficient stereoselective synthetic route to carbocycle is described. 1,1,2-Trisubstituted cyclopentane was synthesized from allylic carbonate by Pd(O) catalyzed cyclization.
이영재(Young Jae Lee),조윤상(Yoon Sang Cho),최재한(Jae Han Choi),김성범(Seoung Bum Kim) 대한산업공학회 2020 대한산업공학회지 Vol.46 No.5
Recently, machine learning algorithms have been widely applied in the automotive industry. In particular, it is important to characterize tire quality that can determine the reliability of product design. However, the previous studies are insufficient to explain tire quality because they are based mainly on experimental design methods. In this study, we propose using convolutional neural networks (CNN) and class activation map (CAM) to predict tire quality and perform cause analysis. To properly reflect the location information of a car, we convert the structured data into the image data. We compare the proposed CNN+CAM with other machine learning methods including random forest, gradient boosting machine, adaboost, linear regression with feature selection, support vector regression, partial least square regression, and deep neural networks. The results indicate that the CNN+ CAM yields higher prediction accuracy than other methods. This implies that the proposed CNN+CAM can identify important variables that play an important role in predicting tire quality.
7,8번 위치에 이중결합을 갖는 10-membered lactone의 효율적인 합성
서영거(Young Ger Suh),이지연(Jee Yeon Lee),조윤상(Youn Sang Cho) 대한약학회 1995 약학회지 Vol.39 No.1
An unusual 10-membered lactone possesing ring-olefin at 7,8-position has been efficiently synthesized. The w-hydroxy acid as a cyclization precusor was derived from epsilon-caprolactone in 41% overall yield of 7 steps and efficiently cyclized by Mukaiyama procedure.