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傾斜入射波浪中의 捨石防波堤에 의한 反射率과 透過率에 관한 硏究
배기성(KEE-SEUNG BAE),김도삼(DO-SAM KIM) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.1
By applying the Boundary Integral Equation Method (BIEM) to obliquely incident waves for Rubble Mound Breakwater (RMB), wave reflection and transmission the coefficients are studied numerically. The validity of and the present BIEM is confirmed by comparing it with 1)numerical results of the eigenfunction expansion method of Dalrymple et al.(1991), and 2)numerical results of the BIEM of Kojima et al.(1988). Therefore, the characteristics of RMB for obliquely incident waves are investigated according to the variations of the wave period, equivalent linear nondimensional friction coefficient and direction of incident waves. It is revealed that the wave transformations of obliquely incident waves are different from those of normally incident waves.
잠제상에 설치된 표식암(의암)에 작용하는 규칙파파력의 실험적 연구
배기성(KI-SEONG BAE),허동수(DONG-SOO HUR) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.6
Recently, artificial rocks, instead of buoys, have been placed on the submerged breakwater to indicate its location. The accurate estimation of wave forces on these rocks is deemed necessary for their stability design. Characteristics of the wave force, however, are expected to be very complicated because of the occurrence of breaking or post-breaking waves. In this regard, wave forces exerted on an artificial rock have been investigated in this paper. The maximum wave force has been found to strongly dependent on the location and shape of the artificial rock that is placed on the submerged breakwater. The plunging breaker occurs near the leading crown edge of a submerged breakwater, which causes impulsive breaking wave force on the rock. Using the Morison equation, with the velocity and acceleration at the front face of the artificial rock and varying water surface level, it is possible to estimate wave forces, even impulsive breaking wave forces, that are acting on the rock installed on a submerged breakwater. The vertical wave force is also found to depend, significantly, on the buoyant force.
위치기반 추천 시스템의 벡터 분석에 의한 알고리즘 설계
배기성 ( Keesung Bae ),서송리 ( Songlee Suh ),석민수 ( Minsoo Suk ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
유비쿼터스 컴퓨팅 환경에서 추천시스템은 무수히 많은 정보들에 대하여 사람들이 적절한 선택을 할 수 있도록 도와준다. 사용자에게 필요한 정보를 찾아주고, 정보들의 우선순위를 결정해주는 추천시스템에 있어서 사용자의 위치는 보다 가치있는 정보를 제공할 수 있는 도구가 된다. 위치기반 추천시스템은 사용자가 아이템들로부터 얼마나 멀리 떨어져있는가를 고려하여 상위 리스트들을 제공할 수 있어야 한다. 하지만 일반적인 추천시스템에서 주로 사용되고 있는 기존의 사용자 기반 협업필터링 기법은 사용자의 자발적인 정보 입력에 의존함으로써 일정한 수의 사용자 정보가 축적되어 있지 않으면 정확한 추천이 불가능한 단점이 있다. 본 논문에서는 아이템에 기반한 협업 필터링 기법을 확률적으로 분석하고, 아이템의 위치에따라 랭킹을 부여하는 방법과 사용자의 위치정보를 추천알고리즘에 적용시켜 보다 정확하고 효율적인 추천방법을 제안하였다.
금강하구둑 축조 전ㆍ후의 지형 및 흐름특성에 관한 연구
신문섭(MOON-SEUP SHIN),배기성(KI-SEONG BAE),강신중(SHIN-JUNG KANG),김재형(JAE-HYOUNG KIM) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.3
The estuary has a very complex coastline and bottom topography. Before the close of floodgate, the Keum river estuary was deposited with sediment from the Keum river, created bythe construction of the Keum river estuary dike. So, a periodical dredging is necessary to assure water depth for boat entry and departure to Kunsan port. Theof this study is to find the change of tidal current of M2tide and the topography before and after construction at the Geum River estuary dike. The change of water depth is investigated by digitizing the sea map (No.305) of Kunsan port, which was edited by National Oceanographic Research Institute. The calculated co-range and co-tidal charts of M2tide before the dike construction are similar to the observed ones. Therefore, the amplitude and phase after construction at Geum River estuary dike increases compared to before construction at Geum River estuary dike. The scour occurred in the A-A' section.
혼성방파제의 케이슨에 작용하는 비선형양압력분포에 관한 연구
김도삼(DO-SAM KIM),배기성(KI-SEONG BAE) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.4
Recently, numerical approaches for wave loads acting on the vertical caisson of composite breakwater, and resulting wave reflection and transmission coefficients have been performed. Although the numerical studies by Sulisz's(1997) and Kim et al.(2000) are suggested representatively, theoretical formulation for nonlinear wave pressure is not developed yet. And experimental results of Sulisz(1997) revealed that nonlinear uplift pressure on the caisson may be produced largely on the case of caisson founded on the high rubble mound. From the results of this study, the nonlinear theory for the uplift wave pressure acting on the caisson by applying boundary integral method of Green theorem is formulated, and also the characteristics of nonlinear uplift pressure and run-up height on the caisson are evaluated numerically, according to the variations of hydraulic properties of the rubble mound ..
서송리 ( Song-lee Suh ),배기성 ( Kee-sung Bae ),석민수 ( Min-su Suk ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
2001년 하반기 이후 디지털 TV 시대가 열리면서 채널의 수와 그에 따른 프로그램의 수가 폭발적으로 증가했다. 그리하여 기존의 방법으로는 시청자가 원하는 프로그램을 선택하는 것이 어려운 일이 되었다. 이 문제를 해결하는 방안으로서 pEPG(personalized Electronic Program Guide)가 많이 연구되어 왔으며 본 논문에서는 pEPG를 위한 추천 방법에 대해 연구하고자 한다. 기존의 추천 방법은 내용기반추천과 협업추천이 대표적인데, 이들은 어느 한쪽이 우월하다기 보다 각각의 단점을 상호보완해주는 관계에 있다. 각 추천 방법이 TV환경의 pEPG에 적용될 때는 어떤 장단점이 있는지 살펴보고, 이에 인구통계학적추천을 혼합한 기법을 제안한다.
신동수(Dong-Soo Shin),배기성(Ki-Seong Bae) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.2
Laboratory settling experiments (column, recirculating flume) were conducted for further understanding of the physical processes of cohesive sediment transport.<br/> In still water experiments, the growth rate of flocculation is dependent upon the initial suspended concentration. Consequently, the settling velocity increases with concentration of flocs. In flocculation settling regime, the exponent n in the settling velocity, ωs=k Cⁿ, for Nakdong estuary mud was obtained empirically. The exponents were found to be 1.33, and 1.06 for the initial suspended concentrations of 1 g/ℓ and 3 g/ℓ, respectively.<br/> In flowing water, experiments for the median settling velocity with Nakdong mud in a recirculating flume were conducted. Settling velocity was found to depend much more strongly on the current velocity than initial concentrations. The temporal variation of suspended concentration increases as current velocity decreases.
Fly Ash를 사용한 수중불분리 콘크리트의 유동성에 관한 연구
권중현(Joong-Hyen Kwon),배기성(Ki-Seong Bae) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.1
This paper is to investigate the Fluidity of Antiwashout Underwater Concrete containing Fly Ash. The results of study are concluded as follows : the increase in Slump Flow value did not happen in the plain concrete which was replaced cement by Fly Ash ; however, the maximum value could reach in the replacement of 30% of Fly Ash by weight of cement in the Fly Ash replaced concrete. On the condition of Fly Ash-Antiwashout Underwater Concrete in expecting 50㎝ of the Slump Flow, it was necessary that the usage amount of Superplasticizer be around 1% of unit Binder, and 1.5% in 60㎝ of the Slump Flow, respectively.