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어선 빌지킬의 치수 파라미터 스터디를 통한 저항성능 맵 작성
박동우 해양환경안전학회 2018 해양환경안전학회지 Vol.24 No.5
본 논문의 주 목적은 전산유체역학(CFD)을 바탕으로 어선에 부착된 빌지킬의 치수 파라미터에 대한 저항성능 맵(MAP)을 작성 하는 것이다. 치수 파라미터 스터디에는 빌지킬의 길이 3가지와 폭 3가지를 선정하여 9가지로 구성하였다. 현존선에 부착된 빌지킬의 길이는 배 길이 대비 약 90 %이고, 폭은 배 폭 대비 약 5 %이다. 수행항목은 빌지킬 길이는 배 길이 대비 63 %, 77%, 90% 그리고 빌지킬 폭은 5%, 7 %, 9 %로 구성하였다. CFD 를 이용하여 9가지 빌지킬에 대하여 실선의 유효마력을 추정하였다. 현존선을 기준으로 길이가 제일 짧고 폭이 제일 긴 빌지킬의 경우 0.3% 감소된 결과를 보여주었다. 길이와 폭 모두가 가장 긴 빌지킬의 경우 1.7% 증가된 결과를 보여주었 다. 길이와 폭 모두가 가장 짧은 빌지킬의 경우 2.3 % 감소된 결과를 보여주었다. 이 맵은 저항성능 관점에서 해당 어선의 이동 및 조업 패턴에 따른 최적의 부가물 치수 선정에 활용 가능하다. The objective of this study is to present a resistance performance map developed using the dimension parameters of a bilge keel appendage attached to a fishing vessel using CFD. The dimension parameters consist of three length and breadth measures of a bilge keel appendage from nine selected cases. The size of a bilge keel attached to an existing ship should be 90 % of the ship length and 5 % of the ship breadth. In this study, bilge keels with a length of 63 %, 77 % and 90 % and a breadth of 5 %, 7 % and 9 % were considered based on ship length and breadth. The effective power in each of the nine cases was predicted using CFD. Based on results from an existing ship, effective power in the case with the shortest length and longest breath was reduced by 0.3 %. The case with the longest length and breadth showed an increase in effective power of 1.7 %. The case with the shortest length and breadth showed a decrease in effective power of 2.3 %. The proposed map can be utilized to select dimensions according to the sailing and work patterns of fishing vessels from the perspective of resistance performance.
Formation Characteristics of a Self-catalyzed GaAs Nanowire without a Ga Droplet on Si(111)
박동우,이철로,김진수,이상준,김영헌,노삼규,오혜민,김용환,임재영,정문석,Jae-Hyun Ryou 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.12
The Ga droplets were totally removed from the top region of the self-catalyzed GaAs nanowires (NWs) formed on Si(111), which was done by controlling arsenic conditions during the growth period and cooling-down process of the substrate temperature. From the spatial luminescence profiles of GaAs NWs measured by using a laser confocal scanning microscopy, the emission position from the NWs without the Ga droplets was 896.4 nm. This was shorter than that with the Ga feature (912.7 nm). The difference in the emission wavelengths can be explained by scattering probability of the photons from GaAs NWs in Ga droplets and modification in energy-level by interface condition.
Phase, Remnant Movement, and Computation:Remarks on Stabler (1999, 2010)
박동우 한국중원언어학회 2019 언어학연구 Vol.0 No.50
In order to explain how people can generate grammatical sentences, Stabler (2010) proposes a computational mechanism on minimalism, based on Chomsky’s (2000) syntactic theory. This computational system suggests the operation called pair feature cancelling, in order to capture the tenet of minimalist syntax that every type of movement is feature-driven (Chomsky, 1995; Van Urk and Richards, 2015 inter alia), and that A̅-moving elements move through edges of phases. Using this mechanism, Stabler (1999) proposes a way of accounting for the derivation of remnant movement. In this paper, however, I argue that Stabler’s (1999, 2010) system has two non-trivial problems: First, pair feature deletion increases the burden in the computation, and thus, it is not intuitive at all. Second, Stabler’s system cannot account for why remnant movement is permitted in some environments, but not in the others. This indicates that Stabler’s computational system is insufficient to capture all kinds of phase-based operations. In order to resolve these problems, I briefly present possible solutions, which is more compatible with Chomsky’s syntactic theories, partially maintaining Stabler’s computational notations.
박동우 대한의사협회 2015 대한의사협회지 Vol.58 No.6
The development of advanced magnetic resonance (MR) imaging techniques for tumors has not only lead to improved diagnostic accuracy, but has also assisted with tumor staging, surgical planning, and postoperative follow-up study. Recently introduced and/or clinically used MR imaging techniques for tumors, including chemical exchange saturation transfer imaging, molecular imaging, magnetic resonance spectroscopy, perfusion, and blood flow suppression techniques, could improve diagnostic accuracy and provide useful information to guide the management of tumors. It is essential to properly obtain and evaluate advanced MR images for tumors, depending on the specific characteristics of each tumor.