http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서규열(KYU-YOUL SUH) 한국해양공학회 2007 韓國海洋工學會誌 Vol.21 No.6
Inference rules of the knowledge base, generated by cexperts or optimization, may be often inconsistent and incomplete. This paper suggests a systematic and automatic method which extracts inferece rules not from experts' subject but from data. First, input/output linguistic variables are partitioned into several properties by the fuzzy equalization algorithm and each combination of their properties comes to premis of inference rule. Then, the conclusion which is the most suitable for the prenise is selected by envaluing consistent measure. This method, automatically from data, derives inference rules from experience. It is Shown through application that extracts new inference rules between hull dimensions and hull performance.
다방향 불규칙파중의 인장계류식 해양구조물의 구조응답 해석
이수룡(Soo-Lyong Lee),서규열(Kyu-Youl Suh),이창호(Chang-Ho Lee) 한국항해항만학회 2007 한국항해항만학회지 Vol.31 No.8
다방향 불규칙파 중에서의 인장계류식 해양구조물(TLP)의 구조응답 해석을 수행함으로써 다방향 불규칙파가 구조응답에 미치는 영향을 평가하고 있다. 인장계류식 해양구조물에 작용하는 파강제력과 동유체력은 3차원 특이점분포법을 사용하여 각각의 외각요소에 대해 평가하였다. 3차원 골조요소로 모델링하여 유한요소법에 의해 구조응답을 평가하였으며, 인장계류식 해앙구조물의 각 외각요소간의 유체역학적 상호간섭을 고려하여 구조응답을 해석하였다. 구조응답의 주파수 응답함수와 다방향파의 스펙트럼을 이용하여 다방향 불규칙파에 대한 해양구조물의 구조응답 스펙트럼을 구하여 다방향 불규칙파가 인장계류식 해양구조물의 구조응답에 미치는 영향을 평가하였다. A numerical procedure is described for estimating the effects of the multi-directional irregular waves on the structural responses of the Tension Leg Platform (TLP). The numerical approach is based on a three dimensional source distribution method for hydrodynamic forces, a three dimensional frame analysis method for structural responses, in which the superstructure of TLP is assumed to be flexible instead of rigid. Hydrodynamic and hydrostatic forces on the submerged surface of a TLP have been accurately calculated by excluding the assumption of the slender body theory. The hydrodynamic interactions among TLP members, such as columns and pontoons, and the structural damping are included in structural analysis. The spectral description used in spectral analysis of directional waves for the linear system of a TLP in the frequency domain is sufficient to completely define the structural responses. This is due to both the wave inputs and responses are stationary Gaussian random process of which the statistical properties in the amplitude domain are well known. The numerical results for the linear motion responses and tension variations in regular waves are compared with the experimental and numerical ones, which are obtained in Yoshida et al.(1983). The results of comparison confirmed the validity of the proposed approach.
최성원,김국현,조대승,서규열 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
In general, fluid-structure interaction analysis techniques are applied to accurately predict underwater radiated noise (URN) from a ship structure, particularly in low frequency range (below 500Hz). In this paper, URN from a double bottom-shaped structure of a ship has been numerically investigated based on a traditional fluid-structure interaction analysis techniques. For this purpose, a coupling method of finite element and boundary element method (FE/BEM) has been presented. A numerical model has generated referring to a double bottom structure arrangement of a general ship. Acoustic radiation efficiency and URN transfer function, by harmonically and vertically excited forces on the top plate of the double bottom, have been evaluated. The results are compared with those of an empirical formula and a simple equation which are usually adopted for URN assessment in design stage, respectively. It has been concluded that the empirical formula of acoustics radiation efficiency needs to be modified in low frequency range for more precise estimation of ship URN in low frequency ranges.
An Optimum Design of a Ship based on Numeric and Knowledge Processing
Soo-Young Kim(김수영),Kyu-Yeul Seo(서규열),Dong-Keun Lee(이동근),Soo-Chul Shin(신수철) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.4
다목적함수 최적화를 효과적으로 수행하기 위하여 유전자 알고리즘과 직접탐색법을 결합하여 혼성형 최적화기법을 구현하였다. 이 방법은 유전자 알고리즘을 사용하여 최적점이 존재할 가능성이 높은 영역을 탐색한 후, 이 영역에서 직접탐색법을 사용하여 최종해를 찾는다. 따라서 탐색의 효율을 향상시키고 계산시간을 절약할 수 있는 장점이 있다. 그러나 최적화기법이 효율적이지만, 최적화기법을 사용하기 위해서는 전문가의 전문지식이 필요하다. 따라서 실제 최적화를 수행하기 위해서는 관련 분야의 전문지식과 최적화기법이 효율적으로 결합되는 것이 필요하다.