CHAPTER 5. CONCLUSION
5.2 FUTURE WORKS
In this study, linear theory in regular waves is adopted in the interaction problem of wave and WEC system. However, to apply the proposed system in-situ, the system should be evaluated in irregular wave conditions by not only numerical analysis but also hydraulic model test.
It is also necessary to develop FEM nonlinear wave model which can consider the free surface effect, the energy losses due to flow separations, and so on. Base on the described model, the development of effective and preferable coastal structures is required for practical design purpose.
직립형방파제에 결합된 OWC-MB 복합형 파력발전시스템
OWC-MB Hybrid Wave Energy Harvesting System with Multi-Resonators Attached to Vertical Breakwaters
본 논문에서는 기존 직립식 방파제를 구조지지물로 적용하여 외해 측에 수 로를 설치하고 수로 내에 부유체를 설치하여 파력을 추출할 수 있는 새로운 시스템에 대해서 연구하였다. 이 시스템은 중복파를 기진력으로 활용하고, 수 로 내 수주와 부유체의 공진현상을 이용하여 에너지 추출효율 극대화할 목적 으로 제안되었다(박 등 2014). 동유체력 산정문제를 정식화하기 위해 선형파 이론에 기초한 Galerkin 유한요소 모델(박 등, 1991)을 이용하여 발전시스템의 성능을 평가한 결과, 기존의 타 시스템에 비하여 우수한 발전효율을 보였으며 수로 내 수주의 공진현상이 성능에 지배적인 영향을 미침을 확인하였다. 또한, 최고의 발전효율을 보이는 조건인 수로의 공진조건 부근에서 최고의 소파효과 를 보였으며 케이스별로 발전효율을 극대화 시키는 발전기의 감쇠계수가 있음 을 확인하였다. 이를 정량적으로 확인하기 위하여 수로의 폭을 다양하게 설정 하여 수리모형실험을 실시하였고 수로 내 부유체의 연직변위 증폭비를 수치해 석과 비교하여 분석한 결과, 전반적으로 부유체의 최적 점성감쇠가 임계감쇠의 5% 내외임을 알 수 있었다. 또한, 반사율 분석을 통해 에너지 손실계수를 비교 한 결과 공진부근에서 부유체보다 수로 주변에서 발생하는 유체 점성감쇠가 발전효율에 미치는 영향이 더 커 이를 최소화하는 노력이 필요한 것으로 평가 되었다. 앞으로 이러한 감쇠계수를 감안한 수치해석의 재산정을 통해 보다 실 질적인 발전량을 추정할 필요가 있다.
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2013년, 2월
부족함에 대한 막연한 갈망으로 해양과학기술전문대학원의 문을 두드렸습니다.
학부 졸업 후 5년이라는 시간이 흐른 후 늦깎이 학생에게 인자한 미소로 공부할 기회를 허락해주시고, 배움의 장을 넓혀 주셨습니다.
2015년, 2월
한 편의 조그마한 결실을 마무리하는 지금도 여전히 부족함을 느낍니다.
하지만 깊이에 대한 부족함이라는 구체적인 차이가 생겼습니다.
목마른 자에게 그늘이 있는 오아시스처럼 쉼터가 되어주신 박우선 지도교수님과 이중우 공동지도교수님께 무한한 감사를 표합니다.
또한, 심사과정에서 부족한 점들을 지적하시고 보완해주신 이진학교수님과 이영호교수님께 감사드립니다. 석사과정 동안 재미있는 추억을 쌓으며 학생들보다도 열정으로 수업을 진행해주신 해양에너지자원그룹 교수님들께 감사드립니다.
연구실에서 함께 토론해 주시고 조언해주신 한국해양과학기술원 원덕희 박사님께 감사드립니다. 바쁘신 중에도 틈을 내어 실험이 진행되도록 배려해주신 오상호 교수님과 한국해양과학기술원 장세철 팀장 및 이상현, 이성봉 선생님께도 감사드립니다. 그리고 같이 심사를 받으며 많은 도움을 준 김정석 학생장을 필두로 동거동락하며 공부했던 해양과학기술전문대학원 1기 동기 여러분들께도 감사드립니다.
대학원 진학을 두고 고민하던 중에 아낌없는 기도의 후원을 해주신 한국해양대학교 김시화 교수님께도 감사드립니다. 덕분에 번뜩이는 아이디어와 이를 추구하고자 하는 연구의 재미를 알게 되었습니다.
본 논문이 완성되기까지 정성으로 지도 편달해주신 박우선 교수님께 식지 말아야할 열정의 때를 알게 해주심에 다시 한 번 깊이 감사드리며, 끝으로, 오늘의 제가 있기까지 말로는 다 형용할 수 없는 사랑을 주신 우리 가족과 이 기쁨을 함께 나누고 싶습니다.
2015.02.
모든 영광을 살아계신 하나님께 돌리며
서 지 혜
올림Name : Seo, JiHye Date of Bitrh : January 1st, 1986
Personal Address : 30, Danggok 2-ro, Danwon-gu, Ansan-si, Gyeonggi-do, Korea
E-mail : [email protected] / [email protected]
EDUCATION
Mar. 2013 ~
Present :
Department of Convergence Study on the Ocean Science and Technology,
Ocean Science and Technology School (OST-school)
• Korea Institute of Ocean Science and Technology (KIOST) & Korea Maritime and Ocean University (KMOU) Joint Program)
• M.S. in Ocean Energy & Resource Mar. 2004 ~
Fe. 2008 :
Korea Maritime and Ocean University (KMOU)
• B.S. in Navigation System Engineering Mar. 2001 ~
Feb. 2004 : Graduated from Dongsan Christian High School
EXPERIENCE
Mar. 2013 ~Present :
OST Student-in-training,
Coastal & Environmental Engineering Division, KIOST July 2011 ~
Feb. 2013 :
Full-time Administrative Associate, Public Relations Team, KIOST Feb. 2011 ~
May 2011 :
Research Assistant,
Marine Environment & Pollution Prevention Research Department, KIOST
REARCH ACHIEVEMENTS
Journal Papers:
1. Seo, J.H., Han, T.H., Han, S.H., Park, W.S. & Won, D.H. (2014) Damage of Steel Composite Hollow RC SFT under Fires, Journal of the Korea Academia-Industrial cooperation Society, 15(7), pp. 4226-4633. (in korean)
2. Seo, J.H., Han, T.H., Park, W.S. Han, S.H. & Won, D.H. (2014) Damage Rate of Reinforced Concrete Submerged Floating Tunnels Under Fire Scenarios, Journal of the Korean Society Hazard Mitigation, 14(4), pp. 59-65.
(in korean)
3. Kim, J.S., Seo, J.H., Lee, J.W. & Park, W.S. (2014) Numerical Analysis of Reflection Characteristics of Perforated Breakwater with a Resonant Channel, Journal of the Korean Institute of Navigation and Port Research, 38(5), pp. 503-509. (in korean)
Conference Papers:
1. Seo, J.H. & Park, W.S. (2014) Wave Power Extracting System with Multi-Resonators Attached to Vertical Breakwaters, Proceedings of the Twenty-fourth (2014) International Ocean and Polar Engineering Conference, Busan, Korea.
2. Seo, J.H. & Park, W.S. (2014) Dispersion of wave forces on caisson breakwaters using interlocking systems, Proceedings of the Second Australasia and South-East Asia Structural Engineering and Construction Conference, Bangkok, Thailand.
Feb. 2011 Dokdo Research Center, KIOST Feb. 2006 ~
July 2006 :
Navigation Apprentice Officer, Hanjin Shipping, Co., Ltd.
(Container in 4,400TEU class, M/V Hanjin Shanghai)
Caisson Breakwaters Having Multiple Resonance Channels with Perforated Plates, Proceedings of the Korean Society Hazard Mitigation 2014 Conference, 1(13), pp.113. (in korean)
4. Seo, J.H., Won, D.H. Han, T.H., Han, S.H. & Park, W.S. (2014) Damage Analysis of Submerged Floating Tunnel Section by Fire Scenario, Proceedings of the Korean Society of Civil Engineers 2014 Conference, pp.
1311-1312. (in korean)
5. Seo, J.H. & Park, W.S. (2013) Performance Analysis of Wave Energy Harvesting System by Using a Linear Electric Generator in Wave Channel, Proceedings of the Korean Society of Civil Engineers 2014 Conference, pp. 749. (in korean)
6. Kim, J.S., Seo, J.H., Lee, Y.H., Lee, J.W. & Park, W.S. (2013) Wave Reflections from Breakwaters Having Resonance Channels with Perforated Plates, Proceedings of the Korean Institute of Navigation and Port Research, pp. 149-150. (in korean)
7. Won, D.H., Seo, J.H., Han, S.H., Park, W.S. & Han, T.H. (2014) Axial Compressive Behavior of Circular Steel Tube under High Temperature, Proceedings of the Korean Society of Civil Engineers 2014 Conference, pp.
1313-1314. (in korean)
8. Lee, J.H., Park, W.S., Seo, J.H. & Won, D.H. (2014) Evaluation of Enhanced Performance for Caisson-type Breakwaters Using Interlocking System, Proceedings of the Eleventh (2014) Pacific/Asia Offshore Mechanics Symposium, Shanghai, China.
9. Won, D.H., Park, W.S., Seo, J.H., Lim, N.H. & Han, T.H. (2014) Confining Transverse Reinforcements for Circular Composite Hollow RC Column with Inner Tube, Proceedings of the Second Australasia and
Bangkok, Thailand.
10. Won, D.H., Han, T.H., Park, W.S., Seo, J.H., & Han, S.H. (2014) Section Performance of Submerged Floating Tunnel using Steel Composite Hollow RC Structure, Proceedings of the OCEANS'14 MTS/IEEE Conference, St. John’s, Canada.
11. Won, D.H., Han, T.H., Han, S.H., Seo, J.H. & Park, W.S. (2014) Behavior of composite hollow RC SFT under fire, Proceedings of the Korean Society of Civil Engineers 2014 Conference, pp. 504. (in korean)
12. Won, D.H., Han, S.H., Ko, S.H. & Seo, J.H. (2014) Investigation of korean habor floating pier, Proceedings of the Korean Society of Korea Society of Coastal Disaster Prevention Annual Conference, pp. 57-58. (in korean)
13. Park, W.S., Lee, J.H., Won, D.H. & Seo, J.H. (2013) Dispersion Characteristics of Wave Forces on Interlocking Caisson Breakwaters, Proceedings of the Korean Society of Korea Society of Coastal Disaster Prevention Annual Conference, pp. 70. (in korean)
14. Won, D.H., Han, T.H., Park, W.S., Yoo, S.R., Seo, J.H. & Sin. D.H.
(2013) Construction Method of Modular Steel-Composite Hollow RC Columns, Proceedings of the Korea Academia-Industrial cooperation Society Conference, pp. 339-341. (in korean)
15. Kim, C.H., Joo, H.T., Jeong, E.Y., Park, C.H., Seo, J.H., Kim, M.H. &
Lee. M.H. (2010) Detailed bathymetry survey of summit area of Dokdo, Proceedings of the Korean Society of Oceanography Conference, pp.
141-143. (in korean)
16. Park, J.Y, Jeong, E.Y., Lee, S.H., Seo, J.H., & Choi T.J. (2010) Neashore Bottom Surface Image processing for the Neashore Benthic Hapbitat