해양법상 해양과학조사제도와 우리나라의 해양과학조사법 : Legal Regime of the Marine Scientific Research in the Law of the Sea and Korea's Marine Scientific Research Law

김호춘 한국해양대학교 해양과학기술연구소 2000 硏究論文集 Vol.9 No.1

거리의존 해양환경에서 수동소나체계의 표적탐지거리예측

김태학,김재수 韓國海洋大學校 附設 海洋科學技術硏究所 1997 硏究論文集 Vol.6 No.-

원거리에서 수동소나에 의한 탐지거리를 예측하기 위해서는 소나방정식이 이용된다. 본 연구에서는 거리와 깊이함수의 신호이득 및 탐지확률을 구한 후 이를 거리로 적분하여 거리의존 해양환경에서 탐지거리를 계산하는 탐지거리 예측모델을 개발하였다. 개발된 모델은 기존에 발표된 거리독립 해양환경에서의 결과와 비교하여 검증하였고, 이를 바탕으로 거리의존 해양환경에서 수동소나에 의한 표적탐지에 큰 영향을 주는 나수성 소용돌이 해양환경에 확장 적용하여 표적의 탐지거리를 예측하였으며, 그 결과에 대하여 소개한다. The prediction of detection range of a passive sonar system is essential to estimate the performance and to optimize the operation of a developed sonar system. In this paper, a model for the prediction of detection range in a range-dependent ocean environment based on the sonar equation is developed and tested. The prediction model calculates the transmission loss using PE propagation model, signal excess, and the detection probability at each target depth and range. The detection probability is integrated to give the estimated detection range. In order to validate the developed model, two cases are considered. One is the case when the target depth is known. The other is the case when the target depth is unknown. The environment. Also, the developed model is applied to the range-dependent ocean environment where the warm eddy exists. The computational results are shown and discussed. The developed model can be used to find the optimal frequency of detection, as well as the optimal search depth for the given range-dependent ocean environment.

다수의 부체로 지지된 초대형 해양구조물에 작용하는 정상표류력 (Ⅱ)

이창호,홍사영,구자삼,조효제,김경태 韓國海洋大學校 附設 海洋科學技術硏究所 1997 硏究論文集 Vol.5 No.-

본 논문에서는 파중에서의 다수의 3차원 임의형상 부체에 의해 지지된 초대형 해양구조물에 작용하는 정상표류력 해석법을 제시한다. 3차원 특이점 분포법, 파의 상호간섭이론, 운동량 이론에 의한 Far field 법과 3차원 골조구조를 다루기 위한 유한요소법을 결합하여 이론을 정식화하였으며, 수치계산 결과를 Kagemoto [6]에 의한 33(3행11렬)개의 footing형 축대칭 부체에 의해 지지된 해양구조물에 작용하는 정상표류력의 실험치 및 계산치와 서로 비교 검토함으로써 본 해석법의 타당성을 검정하였다. A numerical procedure is described for predicting steady drift forces on very large offshore structures supported by a large number of the floating bodies of arbitrary shape in waves. The developed numerical approach is based on a combination of the three-dimensional source distribution method, the wave interaction theory, the far-field method of using momentum theory and the finite element method for structurally treating the space frame elements. Numerical results are compared with the experimental or numerical ones, which are obtained in the literature, of steady drift forces on a offshore structure supported by the 33 (3 by 11) floating composite vertical cylinders in waves. The results of comparison confirmed the validity of the proposed approach.

Acoustic Field Due to An Arbitrary-Shaped Array and Propagation in Laterally Stratified Media Based on Global Matrix Method

Kim,Jae Soo 韓國海洋大學校 附設 海洋科學技術硏究所 1993 硏究論文集 Vol.2 No.1

본 논문에서는 임의배열 변환자로 부터의 3차원 방사와, 그 음장의 적충매질에서 전파모델링을 다루었다. 이러한 문제는 실제해양에서 방향성을 가지게 되는 변환자 배열을 사용할때 적용된다. 이 문제를 풀기 위해서 3차원 모델의 "SAFARI"를 능률적으로 확장하였다. 여기에서 사용된 풀이 방법은 GMM (Global Matrix Method)으로서, 해양저질층를 점성을 가진 탄성체로 모델링하여, 효과적으로 음장을 구하게 된다. 기존의 해법에서는, 방향성을 가진 경우 고차의 Bessel함수로 인해 수치적인 수렴문제가 있었으나, 본 논문에서는 하나의 음원에 대한 완전해를 구함으로써, 변환자배열에 대한 간단한 변환을 중첩모델을 사용하여 수치적인 수렴문제를 해결하였다. 제시된 풀이 방법을 사용하여 Gaussian Beam에 대한 해저면 반사음장과 전달음장에 대한 수치 예제를 제시하였다. Full wave solution to the 3-D radiation from a plane or volume array and propagation in a range independent wave guide are considered in this paper. The situation is encountered frequently when using directional source, i.e. array of sources in ocean environment. The three dimensional version of computer program "SAFARI" is extended for this purpose. The solution technique uses Global Matrix Method for a laterally stratified medium, which finds the full wave solution efficiently for the acoustic medium a swell as elastic medium. Although the nature of this problem involves the Bessel function of higher order, which introduce the convergence problem, the problem can be greatly simplified by using superposition method for the solution to the individual sources. Numerical examples are presented to demonstrate the solution technique.

프레임형 해양구조물의 보치환 기법에 관한 연구

박춘군,박한일 韓國海洋大學校 附設 海洋科學技術硏究所 1999 硏究論文集 Vol.8 No.-

For offshore structures, dynamic analysis becomes increasingly important as water depth increases and structural configuration becomes more slender. In the case of dynamic analysis of frame structures, much computer time and high cost are required due many degrees of freedom. In this paper, a new technique of permutating a segment of frame structure to a beam is developed, which is called here Beam permutation Technique. The technique is based on definition of stiffness matrix of the beam which is obtained by defining the actions(or forces) required to obtain unit translation or rotation for each degree of freedom with all other degree of freedom restrained to zero displacement or rotation. In the technique, and assumption si made that relative positions of nodes in the ends of the segment are not variable. The technique can significantly reduce the degrees of freedom of frame structures and thus the computing time in dynamic analysis. The natural frequencies and static displacements of the permutated beam are obtained and compared to those of ANSYS with a good agreement.

다방향 불규칙파중의 초대형 해양구조물의 동적응답해석

구자삼,조효제,김경태 韓國海洋大學校 附設 海洋科學技術硏究所 1997 硏究論文集 Vol.6 No.-

본 논문에서는 3차원 특이점분포법, 파의 상호간섭이론 및 유한요소법을 결합한 Goo등[29]이 개발한 초대형 해양구조물의 동적응답 해석법과 스펙트럴 해석법을 이용하여 다수의 임의형상 지지부체간의 유체역학적 상호간섭을 고려한 다방향 불규칙파중의 초대형 해양구조물의 운동응답 및 구조응답의 유의치를 동시에 계산할 수 있는 동적응답 해석법을 개발하였으며, 반잠수식 Ring 형상의 초대형 해양구조물을 수치계산 모델로 하여 구조물의 동적응답에 미치는 상호간섭과 다방향파의 영향을 평가하였다. A numerical procedure is described for predicting the motion and structural responses of the very large floating offshore structures supported by multiple 3-D floating bodies of arbitrary shape in multi-directional irregular waves. The developed numerical approach taking into account of the hydrodynamic interactions among the multiple floating bodies is based on a combination of the 3-D source distribution method, the wave interaction theory, the finite element method and the spectral analysis method to get the significant values of the dynamic responses in the multi-directional irregular waves. The effects of wave interactions and directionality on the dynamic responses of a very large offshore structure, which is semisubmersible ring type, are numerically examined.

平坦氷荷重을 받는 細長形 해양구조물의 動的 거동

최경식 韓國海洋大學校 附設 海洋科學技術硏究所 1995 硏究論文集 Vol.4 No.-

Regarding the development of offshore natural gas field near Sakhalin Island which is an ice-infested area, this study aims to estimate the dynamic ice load for construction of offshore structures operating in this region. In this paper the design ice load and dynamic responses of a slender Arctic structure upon continuous ice movement are studied. Crushing after a certain elastic deformation is assumed as a primary failure mechanism at the contact zone between semi-infinite level ice edge and the face of structure. Dynamic interaction forces are calculated using a modified Korzhavin's equation and a two-dimensional ice-structure interaction model is adopted. To verify the numerical model, dynamic analysis is performed for one of the Baltic Sea channel markers whose response patterns were previously observed.

STEP을 이용한 해양건축물의 통합구조설계 기법

송화철 한국해양대학교 해양과학기술연구소 2000 硏究論文集 Vol.9 No.2

The planning process of complex projects in oceanic architectural engineering is characterized by the cooperation of many involved specialists and by a high degree of information exchange. In order to improve the quality of the structural design of oceanic buildings, information of different involved partners in the planning process has to be integrated. This paper aims to introduce a concept of the integrated structural design for the floating-type oceanic building using STEP(Standard for the Exchange of Product Model Data). STEP(ISO 10303) is an international standard for the computer-interpretable representation and exchange of product data and it provides a consistent data exchange formal and application interfaces between different application systems. In this paper, the structural design process and information of oceanic buildings is analyzed and product models are proposed for the exchange of the structural design information between superstructure and floating structure. The entities for calculating wind loads, metacenter and restoring forces are represented by Express. As a case study a floating hotel is applicated to describe the STEP physical file.

유회수기의 유체역학적 특성

현범수 韓國海洋大學校 附設 海洋科學技術硏究所 1998 硏究論文集 Vol.7 No.-

해양오염 사고시 유출유의 수거를 위하여 사용되는 유회수기에 대하여 고찰하였다. 논문의 주요 내용은 (1) 유회수기의 종류, 장단점, 성능지표 및 시장현황에 대한 개괄적인 설명과 (2) 유회수 성능에 영향을 미치는 인자들에 대한 고찰, 그리고 (3) 유회수기 분야에 대하여 현재까지 발표된 논문들에 대한 핵심 아이디어들을 소개하였다. 끝으로 (4) 유체역학적 관점에서 본 유회수기의 특성과 해양, 토목, 기계등 유사관련분야의 연구결과가 유회수기 해석에 어떻게 이용될 수 있는지에 대하여 고찰하였다. The hydrodynamic characteristics of oil skimmers are reviewed. The paper consists of (1) introduction of the general aspects of oil skimmers, including kinds, performance indices, current market situations, (2) the analysis of factors affecting oil-skimming, (3) the review of existing papers with a special focus on hydrodynamic problem and finally (4) conclusions and some suggestions. The purpose of this paper is to draw hydrodynamists' attentions on oil skimmer, more broadly on marine oil spill.

海洋景觀을 考慮한 海洋建築計劃에 關한 硏究

李漢錫 韓國海洋大學校 附設 海洋科學技術硏究所 1998 硏究論文集 Vol.7 No.-

There are numerous structures linked with the sea. They are standing on the water's edge in the waterfront area or ocean space. The most important one of them is oceanic architecture. Oceanic architecture is architectural space created by directly or indirectly using the features of the waterfront or ocean in the design. Therefore the quality of seascape(or oceanscape) can be greatly influenced by the oceanic architecture. In this paper the characteristics and planning of seascape are examined. Especially recommendations for planning of seascape are dealted with each category of seascape, and then on the basis of them architectural design guidelines are suggested for creating good quality of seascape.