1.Introduction

An Experimental Method for Analysis of the Dynamic Behavior of Buoys in Extreme Environment

⇑(제목: 휴먼명조/16point/가운데)

Gil-Dong Hong*, Gil-Dong Kim** and Gil-Dong Lee**

⇑(영문이름: 휴먼명조/:11point/가운데)

*Ocean Development System Laboratory, KORDI, Daejon, Korea  ⇐(소속: 휴먼명조/이탤릭/9point/가운데)

**Hyundai Heavy Industry Co. Ltd., Ulsan, Korea  ⇐(소속작성: 소속명/지역명/국가명/가운데)

***Dept. of Hydrodynamics, New York Polytechnic Institute, New York, U.S.A.

⇓(타이틀: 휴먼명조/9point/진하게/양쪽)

KEY WORDS: Porous flexible membrane, Wave barrier, Eigenfunction expansion method, Porosity parameter                                                                    ⇑(본문 용어 휴먼명조/첫문자:대문자, 첫문자 이외:소문자/9point/양쪽)

⇓(타이틀: 휴먼명조/9point/진하게/양쪽)

ABSTRACT: An experimental method to investigate the dynamic characteristics of buoys in extreme environmental condition is established. Because the buoy model requires a resonable size for accurate experiment, the test condition in model basin that satisfies the similarity law is hardly compatible with capability of test facilities. It is suggested that the linear wave component that is unable to satisfy similarity is separated with others.  ⇐(본문내용: 휴먼명조/9point/이탤릭/양쪽)

한국해양공학회 학술대회

⇑(첫문자: 대문자/휴먼고딕/11point/가운데)

The performance of a vertical-screen membrane breakwater was investigated by Thomson et al.(1992), Aoki et al.(1994), Kim and Kee (1996) and Williams (1996). Using the linear wave theory and membrane-motion equation, Kim and Kee (1996) showed that almost complete reflection was possible despite appreciable sinusoidal motions of membrane, which tend to generate only exponentially decaying local waves in the lee side. The theory was compared favorably with 2-D tank experiments (Kim et al., 1996).

⇑(본문 내용: 휴먼명조/9point/양쪽)

2. Mathematical Formulation

⇑(각 단어 첫문자:대문자/휴먼고딕/11point/가운데)

⇓(첫단어 첫문자만 대문자/휴먼고딕/9point/양쪽)

2.1 Similitude law for wave conditions

The wavenumber[eqn: k_1] satisfies the dispersion relation, [eqn: omega^2 =g k_1 tanh k_1 h] ⇐(원고 속의 수식은 띄워 쓰지 않고 붙임), with [eqn: g] and  [eqn: h] being the gravitational acceleration and water depth, respectively. Similarly, the vertical displacement of membrane can be written as

[eqn: Xi(x,t)=Re\{ xi(x) e^{-i omega t} \}]⇐수식편집기사용 번호:오른쪽⇒(1)

The velocity potential [eqn: phi] satisfies the Laplace equation

[eqn: {partial^2 phi}over{partial x^2}+{partial^2 phi}over{partial y^2}=0 \in~\the~\fluid]                        (2)

with the following boundary conditions

[eqn: partial phi /partial y-nu phi =0~~(nu=omega^2 /g)]on [eqn: y=0]              (3)   [eqn: {partial phi}over{partial y}=0~ \on~y=-h]                              (4)

⇓(첫단어 첫문자만 대문자/휴먼고딕/9point/양쪽)

2.2 Similitude law for wind conditions

Including all the flexible membrane modes, the complex potential [eqn: phi(x,y)] can be expressed in the form

[eqn: &phi(x,y)=phi_D (x,y) + SUM from { { l}=0} to inf zeta_l phi_lR (x,y)]                 (5)

where [eqn: phi_D] is the diffraction potential and [eqn: phi_S , phi_lR] denote the scattering and radiation potential, respectively. The incident wave potential [eqn: phi_l] with wave amplitude A=1 is given by

.. ..(중략).. ..(영문원고 내: 숫자와 단위는 한칸 띄울 것)

3. Analytic Solutions

⇑ (각 단어 첫문자:대문자/휴먼고딕/11point/가운데)

Region (I) is defined  by [eqn: x<= -a, -h<y<0], and region (II) by [eqn: |x|<= a,-h<y<0]. The diffraction potential satisfies the Eq.√(2)(식과 번호는 띄움), boundary conditions Eq. (3)～Eq. (5)(범위표시는 「～」으로) with [eqn: xi=0]. In the following, the symmetry of the fluid and membrane is used by splitting [eqn: phi_D] into symmetric and asymmetric parts.

Finally, the reflection and transmission coefficients can be determined from

[eqn: R_f =| [a_0 ^S +a _0 ^A )+sum_l=1 ^ infty zeta_l (a_lR ^S +a _lR ^A )]e^{k_10 a} |]              (6)

4. Results and Discussions

⇑(각 단어 첫문자:대문자/휴먼고딕/11point/가운데)

Figure 1 shows transmission coefficients against dimensionless wavenumber for [eqn: b=2.0] and various membrane tensions (non-dimensional tension=0.05, 0.1, 0.2, [eqn: infty]). (문장 서두: Figure / 문장 속: Fig. 1, Fig. 2 ..)

⇓(타이틀: 진하게)

Table 1  Computed wind and current forces on buoy models

Buoy	Wind		Current
	Force [Kgf]	Center [m]	Force [Kgf]	Center [m]
LL-26(M)	5.714	0.588	5.508	0.536
LNBY-100	2.563	0.516	2.729	0.140

① Table 캡션작성 요령:

휴먼명조/9point/진하지 않게

한줄: 양쪽정렬/가운데 정렬 하지 말 것

두줄 이상: 양쪽정렬/두번째줄 부터는 첫 번째줄에 맞출 것

② 상부 테두리선: 두줄/하부 테두리선: 한줄/

내부 테두리선: 한줄/좌.우 데두리선: 삭제

③ 표에 사용된 용어 및 단위부분과 아래 결과부분만을 분리하여     테두리선 기입

④ 모든 세로 테두리선 삭제

⑤ Table: 개체속성→글자처럼 취급

(a) LL-26(M) ⇐(가운데)      (b) LL-30

⇓(타이틀: 진하게)

Fig. 1  Maximum height of tension forces acting on the                   mooring line at buoy

① Figure 캡션 작성요령:

휴먼명조/9point/진하지 않게

한줄: 양쪽정렬/가운데 정렬 하지 말 것

두줄 이상: 양쪽정렬/두 번째 줄부터는 첫 번째 줄에 맞출 것

② 동일 Figure는 페이지를 넘기지 말 것

③ 동일 Figure는 동일 단에 삽입(Figure 수가 많거나 너무 커     서, 단을 넘길 경우 단을 분리 않고 1단으로 하여 작성)

④ Figure: 개체속성→글자처럼 취급

<주의>

① 원고 속에 삽입되는 모든 Table 및 Figure의 배열 위치는      각 페이지 각단 상부 또는 하부에 일괄 배치

② Table, Figure의 캡션은 모두 영문

③ Table, Figure의 내용은 모두 영문

5. Conclusions

⇑(첫문자: 대문자/휴먼고딕/11point/가운데)

The interaction of monochromatic incident waves with a horizontal porous flexible membrane was investigated in the context of two-dimensional linear hydro-elastic theory.

(1) Using the developed computer program, the performance of submerge ..(중략).. various membrane tensions, lengths, and submergence depths.

(2) Since the horizontal membrane does not directly block(둘째줄부터는 앞에서부터 채울 것) incoming waves, ..(중략).. to be an effective wave barrier.

Aknowledgements

⇑(첫문자:대문자/휴먼고딕/11point/가운데)

This paper is partly supported by Korea Research Foundation Grant No. 1999-234-123.

References

⇑(첫문자:대문자/휴먼고딕/11point/가운데)

Aoki, S., Liu, H. and Sawaragi, T. (1994).　“Wave Transformation and Wave Forces on Submerged Vertical Membrane”, Proc. Intl. Symp. Waves - Physical and Numerical Modeling, Vancouver, pp 1287-1296

Cho, I.H. and Kim, M.H. (1998). "Interactions of a Horizontal Flexible Membrane with Oblique Waves",  J. of Fluid Mech., Vol 356, No 4, pp 139-161.

Schlichting, H. (1968). Boundary Layer Theory, 6th ed., McGraw-Hill, New York.

① 참고문헌 작성순서는 「a, b, c...순」

② 관련저자(총 저자명)는 빠뜨리지 말고 모두 기입

③ 저자 다음에 년도기입:0000/마침표 기입/(ex) (2006).

④ 참고문헌내 문헌의 표시는 「“ “」로 통일

⑤ Vol, No, pp 다음 마침표 삭제/최종 숫자 다음 마침표/

pp 범위표시는 「-」사용/(ex) Vol 20, No 2, pp 100-110.