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Structural optimization of stiffener layout for stiffened plate using hybrid GA
Gerry Liston Putra,Mitsuru Kitamura,Akihiro Takezawa 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
The current trend in shipyard industry is to reduce the weight of ships to support the reduction of CO2 emissions. In this study, the stiffened plate was optimized that is used for building most of the shipstructure. Further, this study proposed the hybrid Genetic Algorithm (GA) technique, which combines a genetic algorithm and subsequent optimization methods. The design variables included the number and type of stiffeners, stiffener spacing, and plate thickness. The number and type of stiffeners are discrete design variables that were optimized using the genetic algorithm. The stiffener spacing and plate thickness are continuous design variables that were determined by subsequent optimization. The plate deformation was classified into global and local displacement, resulting in accurate estimations of the maximum displacement. The optimization result showed that the proposed hybrid GA is effective for obtaining optimal solutions, for all the design variables.
Structural optimization of stiffener layout for stiffened plate using hybrid GA
Putra, Gerry Liston,Kitamura, Mitsuru,Takezawa, Akihiro The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
The current trend in shipyard industry is to reduce the weight of ships to support the reduction of CO<sub>2</sub> emissions. In this study, the stiffened plate was optimized that is used for building most of the ship-structure. Further, this study proposed the hybrid Genetic Algorithm (GA) technique, which combines a genetic algorithm and subsequent optimization methods. The design variables included the number and type of stiffeners, stiffener spacing, and plate thickness. The number and type of stiffeners are discrete design variables that were optimized using the genetic algorithm. The stiffener spacing and plate thickness are continuous design variables that were determined by subsequent optimization. The plate deformation was classified into global and local displacement, resulting in accurate estimations of the maximum displacement. The optimization result showed that the proposed hybrid GA is effective for obtaining optimal solutions, for all the design variables.
The Impact of Hurricanes on Investor Sentiment and Stock Market Returns
Daniel Huerta,Daniel Perez-Liston 사람과세계경영학회 2011 Global Business and Finance Review Vol.16 No.2
In this paper, we employ an event study methodology to examine the impact of hurricanes on investor sentiment and stock market returns. Our results show that there is a significant decrease in stock returns on the day hurricanes make landfall and one day prior. Additionally, we observe that not all industries are significantly impacted and that firms with large market capitalization are least impacted by hurricanes. Further, we find a significant increase in investor fear on the day of hurricane landfalls, and a significant decrease in investor sentiment during the week prior to landfalls. These results suggest that hurricanes and the anticipation of these storms have a negative and significant impact on both stock market returns and investor sentiment.
정보(情報) 시스팀 설계(設計)에 있어서의 시스팀 접근법(接近法)의 응용(應用)
D.M. 리스턴, Jr,M.L. 쇼온,Liston, Jr., David M.,Schoene, Mary L. 한국과학기술정보연구원 과학기술정보센터 1972 Journal of Information Science Theory and Practice Vol.5 No.3
시스팀 설계(設計)는 지극히 복잡한 일련의 선택(選擇)으로 이루어져 있거니와, 어느 한가지 결정사항(決定事項)도 이미 내려졌거나 장차 내려질 여타의 결정(決定)들과 완전히 절연된 것은 없다. 문헌정보(文獻情報) 시스팀의 설계(設計)를 위한 시스팀 접근법(接近法)에 있어서는, 시스팀의 작업능력(作業能力), 성능(性能), 비용(費用) 및 기타 특징요인(特徵要因)을 감안하여 설계과정(設計過程)에 이루어질 제선택(諸選擇)과 이들 선택(選擇)에 내포된 세부사항(細部事項)에 대하여 세밀한 검토가 가해져야 한다. 이 보문(報文)의 저자(著者)들은 다음과 같이 6단계(段階)로 된 하나의 체계적 설계절차(設計節次)를 창도하고 있다. 1) 고정설계인자(固定設計因子)의 확인, 2) 가변설계인자(可變設計因子)의 확인, 3) 각(各) 가변설계인자(可變設計因子)에 내포된 제임의요소(諸任意要素)의 확인, 4) 제임의요소(諸任意要素) 가운데서 하나를 선택할 때 그 선택에 영향을 주는 요소(要素)의 확인, 5) 제임의요소(諸任意要素) 가운데서 하나를 선택할 때 그 선택으로 인하여 영향을 받는 요소(要素)의 확인, 및 6) 설계과정(設計過程)에서 내려야 할 제결정(諸決定)의 최적순서(最適順序) 및 결정과정(決定過程) 그 자체의 본질(本質)을 파악하기 위하여, 상술한 바 제단계(諸段階)를 통해서 밝혀진 전체 상황(狀況)에 대하여 논리적(論理的) 분석(分析)을 가(加)함.