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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Navigation and Port Research
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Journal DOI :
Korean Institute of Navigation and Port Research
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Volume & Issues
Volume 31, Issue 9 - Dec 2007
Volume 31, Issue 10 - Dec 2007
Volume 31, Issue 8 - Oct 2007
Volume 31, Issue 7 - Sep 2007
Volume 31, Issue 6 - Aug 2007
Volume 31, Issue 5 - Jun 2007
Volume 31, Issue 4 - Jun 2007
Volume 31, Issue 3 - Apr 2007
Volume 31, Issue 2 - Mar 2007
Volume 31, Issue 1 - Feb 2007
Selecting the target year
Automatic Berthing Control of Ship Using Adaptive Neural Networks
Nguyen, Phung-Hung ; Jung, Yun-Chul ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 563~568
DOI : 10.5394/KINPR.2007.31.7.563
In this paper, an adaptive neural network controller and its application to automatic berthing control of ship is presented. The neural network controller is trained online using adaptive interaction technique without any teaching data and off-line training phase. Firstly, the neural networks used to control rudder and propeller during automatic berthing process are presented. Secondly, computer simulations of automatic ship berthing are carried out in Pusan bay to verify the proposed controller under the influence of wind disturbance and measurement noise. The results of simulation show good performance of the developed berthing control system.
Hydroelastic Response of VLFS with Submerged-Plate Using Modified Hydrodynamic Coefficients
Lee, Sang-Min ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 569~578
DOI : 10.5394/KINPR.2007.31.7.569
The primary objective of this study is to present a modified method of hydroelastic analysis and application of it to the VLFS with submerged plate. The modal analysis method is applied to the VLFS with the submerged plate using the modified hydrodynamic coefficients. Namely, the wave exciting forces are modified by the transmission wave coefficients, while the interaction factor is used for the modification of radiation forces. To validate the proposed method, comparisons between the numerical calculations and experimental data have been carried out for the deflections of VLFS, and it shows good agreement between the calculation and experiment. The results presented in this study demonstrate that the elastic response of the VLFS is strongly affected by the hydrodynamic interaction induced by the submerged plate. As a result, we can confirm that the submerged plate is useful for reducing the hydroelastic deflection of VLFS, and the proposed method is valuable for predicting the elastic response of VLFS with attached the submerged plate.
A Practical Application of Multiple Wave Models to the Small Fishery Harbor Entrance
Jung, Jae-Hyun ; Lee, Joong-Woo ; Jeon, Min-Su ; Kang, Seok-Jin ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 579~587
DOI : 10.5394/KINPR.2007.31.7.579
Samchunpo(Sin Hyang) Harbor is located in the bay of Sa Chun, the central south coast of Korean peninsula. The harbor and coastal boundaries have been protecting by natural coastal islands and shoals. Currently, The Sin Hyang harbor needs maintenance and renovation of the sheltered structures against the weather deterioration and typhoon damages. Consequently to support this, the calculation of accurate design wave through the typhoon wave attack is necessary. In this study, calculation of incident wave condition is simulated using steady state spectrum energy wave model(wide area wave model) from 50 years return wave condition. And this simulation results in wide offshore area were used for the input of the extended mild slope wave model at the narrow coastal area. Finally, the calculation of design wave at Sin Hyang harbor entrance was induced by Boussinesq wave model(detail area wave model) simulation. The numerical model system was able to simulate wave transformations from generation scale to shoreline or harbor impact. We hope these results will be helpful to the engineers doing placement, design, orientation, and evaluation of a wide range of potential solutions in this area.
Numerical analysis on Deformation of Seabed Structures with various size materials by DEM
Kim, Mi-Kum ; Kim, Chang-Je ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 589~595
DOI : 10.5394/KINPR.2007.31.7.589
In the majority of previous studies on deformation of seabed structures using DEM, elements of structures have been assumed that it is composed with uniform materials or received fixed wave force, despite that actual submerged structures are composed with various size materials and influenced by complicated fluid field. The goal of this study is to develop a new model for analysis of seabed structure deformation using discontinuous structures composed with various size materials. As the first phase, a model using DEM and VOF, which can compute the deformation of submerged structures composed with various size materials, such as rubble mound structures, is proposed. A model test is carried out and then the validity of the model is discussed.
Predictive Control for a Fin Stabilizer
Yoon, Hyeon-Kyu ; Lee, Gyeong-Joong ; Fang, Tae-Hyun ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 597~603
DOI : 10.5394/KINPR.2007.31.7.597
A predictive controller can solve a control problem related to a disturbance-dominant system such as roll stabilization of a ship in waves. In this paper, a predictive controller is developed for a fin stabilizer. Future wave-induced moment is modeled simply using two typical regular wave components for which six parameters are identified by the recursive Fourier transform and the least squares method using the past time series of the roll motion. After predicting the future wave-induced moment, optimal control theory is applied to discover the most effective command fin angle that will stabilize the roll motion. In the results, wave prediction performance is investigated, and the effectiveness of the predictive controller is compared to a conventional PD controller.
Development of Operation Strategy to improve Efficiency for Twin Automated Transfer Crane in an Automated Container Terminal
Park, Byung-Joo ; Choi, Hyung-Rim ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 605~611
DOI : 10.5394/KINPR.2007.31.7.605
In order to become a mega hub port, major ports all over the world are making every effort to enhance their productivity through efficiency of internal operation. Accordingly, in order to enhance the competitiveness of a container terminal, an automated container terminal is considered as the best alternative. An automated container terminal is using such automated handling equipment as AGV(Automated Guided Vehicles) and ATC(Automated Transfer Crane). The efficient equipment operation plays a critical role in enhancing the productivity of an automated container terminal. In an automated container terminal, the most important equipments are AGV and ATC. Each block of containers with a vertical layout is generally operating two ATCs. The two ATCs can be crossed or not at each block. In the case of operating crossover ATC, it has an advantage of high flexibility that ATC work is possible at both TP(Transfer Point) of each block. But it has also a disadvantage that the yard has to be operated at a low storage level of containers in the terminal yard. Recently, for automated container terminals, which are being prepared for opening in Korea, they plan to use uncrossed twin ATC in order to make the storage level of their yards high at a low cost. Therefore, studies have to be made in order to increase the efficiency of twin ATC system based on the flexibility that the crossover ATC system has. This research aims to suggest an operation strategy to improve efficiency of twin ATC at each storage block in a yard.
An Evaluation on Application Field of RFID in Container Terminal by ANP
Kim, Hyun ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 613~621
DOI : 10.5394/KINPR.2007.31.7.613
As the era of ubiquitous has come, it is able to have more convenient and efficient operation system since many efforts have devoted to developing an appropriate operation system in the ubiquitous environment and applying RFID/USN technology to various parts in the industry. Also, the port logistics area has considered RFID/USN to develop more efficient port logistics environment and improve their efficiency. Therefore, this study investigates current trends of RFID technology and application cases in the port logistics area since RFID stands in the important position of changes of maritime port environment. This study tries to find possible areas for applying RFID technology and analyze expected effects when RFID is adopted those areas. Lastly, the priority level among the possible RFID application fields in the container terminal has been evaluated by experts' survey.
Evaluation of Busan Marine Tourism Cluster by the Concordance Test
Yhang, Wii-Joo ; Lee, Sang-Ho ; Jun, Jae-Kyun ;
Journal of Navigation and Port Research, volume 31, issue 7, 2007, Pages 623~628
DOI : 10.5394/KINPR.2007.31.7.623
By employing primarily the Kendall's Concordance Test, the paper attempted to conduct an experts' evaluation on the interaction among the agents in Busan marine tourism cluster and recommend some measures for policy consideration for the cluster's activation. For this purpose, a conceptual framework was developed to guide the assessment by using inter-agent cooperation and network approaches regarding the nature of the marine tourism cluster. Such factors as cooperation, competition, relationship marketing, and networking were identified as critical. Findings of the study imply that Busan marine tourism cluster is at its embryonic stage and needs desperate measures for improvement in the inter-organizational cooperation and networking, the major regional characteristics that determine the competitiveness of marine tourism.