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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Ocean Engineering and Technology
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Journal DOI :
Korean Society of Ocean Engineers
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Volume & Issues
Volume 19, Issue 6 - Dec 2005
Volume 19, Issue 5 - Oct 2005
Volume 19, Issue 4 - Aug 2005
Volume 19, Issue 3 - Jun 2005
Volume 19, Issue 2 - Apr 2005
Volume 19, Issue 1 - Feb 2005
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Nonlinear Hydroelastic Analysis Using a Time-domain Strip Theory m Regular Waves
CHO IL-HYOUNG ; HAN SUNG-KON ; KWON SEUNG-MIN ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 1~8
A nonlinear time-domain strip theory for vertical wave loads and ship responses is to be investigated. The hydrodynamic memory effect is approximated by a higher order differential equation without convolution. The ship is modeled as a non-uniform Timoshenko beam. Numerical calculations are presented for the S175 Containership translating with the forward speed in regular waves. The approach described in this paper can be used in evaluating ship motions and wave loads in extreme wave conditions and validating nonlinear phenomena in ship design.
Submerged Porous Plate Wave Absorber
PARK W.T. ; LEE S.H. ; KEE S.T. ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 9~14
In the present paper, the wave absorbing performance of the fully submerged horizontal porous plates has been investigated, numerically and experimentally. The submerged porous system is composed of multi-layered horizontal porous plates that are clamped at the vertical setwall, which are slightly inclined and placed vertically, in parallel, with spacing. The hydrodynamic interaction of incident waves with the rigid porous multi-layered plates was formulated within the context of linear wave-body interaction theory and Darcy's law. In order to validate the effectiveness of the present computing code, the numerical results were compared with the analytical and experimental results. It is found that triple horizontal porous plates with slight inclination, if properly tuned for wave energy dissipation against the standing waves in front of the vertical wall, can have high performances in reducing the reflected wave amplitudes against the incident waves over a wide range of wave frequency.
Slamming Load Analysis
LEE BEE-SUNG ; KWON SUN-HONG ; LEE JONG-HYUN ; JUNG BYUNG-HOON ; SONG KI-JONG ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 15~20
This paper presented the development of a new experimental and numerical technique for the investigation of slamming impact. The in-house code was developed, based on the boundary element method. The application of commercial code was attempted using FLUENT. Pneumatic cylinder and LM-guide were introduced to closely simulate the free fall phenomenon. It was demonstrated that the proposed experimental and numerical studies can be useful tools in investigating slamming phenomenon.
Fatigue Crack Detection Test of Weldments Using Piezoceramic Transducers
KIM MYUNG HYUN ; KANG SUNG WON ; KEUM CHUNG-YON ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 21~27
Large welded structures, including ships and offshore structures, are normally in operation under cyclic fatigue loadings. These structures include many geometric discontinuities, as well as material discontinuities due to weld joints. The fatigue strength at these hot spots is very important for the structural performance. In the past, various Non Destructive Evaluation (NDE) techniques have been developed to detect fatigue cracks and to estimate their location and size. However, an important limitation of most of the existing NDE methods is that they are off line; the normal operation of the structure has to be interrupted, and the device often has to be disassembled. This study explores the development of a structural health monitoring system, with a special interest in applying the technique to welded structural members in ship and offshore structures. In particular, the impedance based structural health monitoring technique that employs the coupling effect of piezoceramic (PZT) materials and structures is investigated.
An Experimental Study on the Application of Porous Scoria Concrete to Artificial Reefs for Soft Coral
HONG CHONG-HYUN ; KIM MOON-HOON ; KIM SEOK-CHEL ; PARK SUNG-BAE ; Ryu SEONG-PIL ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 28~34
In the study application of volcanic scoria concrete to artificial reefs is investigated. Volcanic scoria is a natural volcanic product that shows light weight, mil/i-porous, and far-infrared irradiation characteristics. The properties of volcanic scoria concrete using Jeju scoria aggregate are evaluated by conducting a comprehensive series of tests on strength and void ratio. It is concluded that the volcanic scoria concrete has the sufficient strength of 4MPa-13MPa and adequate void ratio of
to be accepted as artificial reef concrete. The field experiments are performed through observation by scuba diver's at the Seogwipo coast. Porous specimen and plane concrete specimen are prepared for comparison purposes. Seasonal changes of soft coral on the two series of test specimens were have been observed from Apr. 9, 2004 to Mar. 18, 2005. The soft coral is well grown on the porous specimen however there are no significant changes on the conventional plain concrete specimen. Thus it is concluded that the volcanic scoria concrete is highly suitable as artificial reef concrete.
Development of Oil Spills Model and Contingency Planning ill East Sea
RYU CHEONG-RO ; KIM HONG-JIN ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 35~41
There has been increasing offshore oil exploration, drilling, and production activities, as well as a huge amount of petroleum being transported by tankers and pipelines through the ocean and costal environment. Assessment must be made of the potential risk of damage resulting from the exploration, development and transportation activities. This is achieved through predictive impact evaluations of the fate of hypothetical or real oil spills. VVhen an oil spill occurs, planning and execution of cleanup measures also require the capability to forecast the short-term and long-term behavior of the spilled oil. A great amount of effort has been spent by government agencies, oil industries, and researchers over the past decade to develop more realistic models for oil spills. Numerous oil spill models have been developed and applied, most of which attempt to predict the oil spill fate and behavior. For an actual contingency planning, the oil fate and behavior model should be combined with an oil spill incident model, an environmental impact and risk model and a contingency planning model. The purpose of this review study is to give an overview of existing oil spill models that deal with the physical, chemical, biological, and socia-economical aspects of the incident, fate, and environmental impact of oil spills. After reviewing the existing models, future research needs are suggested. In the study, available oil spill models are separated into oil spill incident, oil spill fate and behavior, environmental impact and risk, and contingency planning models. The processes of the oil spill fate and behavior are reviewed in detail and the characteristics of existing oil spill fate and behavior models are examined and classified so that an ideal model may be identified. Finally, future research needs are discussed.
A Study on Settling Properties of Cohesive Sediments in Shihwa Lake
LEE YOUNG-JAE ; LEE SANG-HWA ; HWANG KYU-NAM ; RYU HONG-RYUL ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 42~48
The sediment of Shihwa Lake contains an abundant quantity of cohesive sediments. The transport processes of the cohesive sediments are complex and difficult to predict, quantitatively. The cohesive sediments are the primary reason for the pollution of the environment and water quality in the coastal region. In this study, a column test has been performed. In order to quantify the settling velocities of sediment from Shihwa Lake, an experiment was conducted using a specially designed 1.8m tall settling column. A series of settling tests and physico-chemical property tests on Shihwa Lake cohesive sediments has been conducted to investigate the correlation between settling properties and their physico-chemical properties, which are represented as grain size distribution, mineralogical composition, and percentage oj organic contents. Experimental results of physico-chemical property tests show that Shihwa Lake sediments are relatively large in average grain
contain very small organic
, and are dominantly composed of Quarts, which has relatively low cohesion. Thus, Shihwa Lake sediments might be specified as those whose settling properties are more influenced by gravity than cohesion. It is concluded that the magnitude of settling velocities of muddy sediments can be quite different, regionally, and it implies that field or laboratory experiments for settling velocity measurement should be preceded over the numerical modeling of muddy sediment transport, in order to obtain the reliable prediction results for a given specific site.
An Application of CADMAS-SURF to the Wave run-up in Permeable Coastal Structures
YOON HAN-SAM ; CHA JONG-HO ; KANG YOON-KOO ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 49~55
We constructed and demonstrated a numerical CADMAS-SURF(V4.0) model that reproduces the wave run-up characteristics on the slope of coastal structures and applied it to a permeable coastal structure. We also compared the numerical model with published experimental results on the hydrodynamic phenomena of structures and some numerical results for a modified Pbreak model. In conclusion, the CADMAS-SURF model efficiently simulated wave run-up on the slope of a permeable coastal structure. The inflow/outflow effects from the porous structure boundary were approximately
more than with the modified Pbreak model. Nevertheless, the descriptions of the internal hydraulic characteristics still could not be full!! exacted from the result(Fig. 1 참조)s obtained in our model experiment.
An Empirical Study of Selection of Cruise Terminals Location by Using HFP
CHOI DO-SUEK ; LEE SANG-HWA ;
Journal of Ocean Engineering and Technology, volume 19, issue 4, 2005, Pages 56~65
This study aims at selecting optimum locations for cruise terminal This study uses the HFP(Hierarchical Fuzzy Process) based on the fuzzy theory, which is known to be effective in evaluating a complicated system whose evaluation attribut are vague or overlapping with one another such as the elements in selecting cruise terminal location and in treating both qualitative and quantitative data.