Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Concrete (4)
- Carbonation (2)
- Chloride (2)
- Extension neural network (2)
- Fault diagnosis (2)
-
- Model test (2)
- Particle swarm optimization (2)
- Piled-raft foundation (2)
- Reflection (2)
- 300M steel (1)
- 316 stainless steel (1)
- 3D simulation (1)
- Acceleration response (1)
- Acoustic data (1)
- Activator modulus ratio (1)
- Active disturbance rejection control (1)
- Active vibration isolation systems (1)
- Adoption intention (1)
- Alkali-activated fly ash/slag (AAFS) fly ash/slag ratio (1)
- Analytical method (1)
- Anchovy (1)
- Antiwindup (1)
- Arch beam (1)
- Area spinning reserve (1)
- Artificial neural network (1)
- Artificial neural network (ANN) (1)
- Artificial neural networks (1)
- Assessment (1)
- Asymmetric threshold co-integration model (1)
- Automated container terminal (1)
Articles 1 - 30 of 75
Full-Text Articles in Engineering
Effects Of Power System Stabilizer On Damping Of Inter-Area Oscillation Using Remote Signal, Van-Dien Doan, Ta-Hsiu Tseng, Pei-Hwa Huang
Effects Of Power System Stabilizer On Damping Of Inter-Area Oscillation Using Remote Signal, Van-Dien Doan, Ta-Hsiu Tseng, Pei-Hwa Huang
Journal of Marine Science and Technology
The inter-area oscillations in large interconnected power systems often have features of being low-frequency, lightly damped, and affecting relatively more generating units located in multiple areas. They restrict the allowable power flow on tielines and may lead to unexpected contingencies if it is not to be in proper observation. The main objective of this paper is to present a small signal stability analysis applied to Vietnam Power System which is a longitudinal network structure with the consideration of Power System Stabilizers (PSS) in operation to enhance the damping of inter-area oscillation by using local as well as remote feedback signals …
Analysis Of Wave Interaction With Double Vertical Slotted Walls Using Mbem, Ching-Yun Yueh, Chih-Hao Su, Chun-Chiang Wen, Shih-Hsuan Chuang
Analysis Of Wave Interaction With Double Vertical Slotted Walls Using Mbem, Ching-Yun Yueh, Chih-Hao Su, Chun-Chiang Wen, Shih-Hsuan Chuang
Journal of Marine Science and Technology
In this paper, a multi-domain boundary element method (MBEM) is formulated and applied to study wave interaction with double vertical slotted walls, which are modeled as thin or non-thickness structures. Two-dimensional motion with wave crests parallel to the vertical slotted walls and linearized irrotational flow are assumed. The accuracy of the solution obtained using the numerical technique is demonstrated by comparing the numerical values with those obtained from experiments and from other analytical solutions. A comparison of the hydrodynamic performance of the breakwater with identical or different double vertical slotted walls is conducted. In addition, the numerical results of the …
Robust Mixed H2/Passivity Performance Controller Design For Uncertain Drum-Boiler System, Cheung-Chieh Ku
Robust Mixed H2/Passivity Performance Controller Design For Uncertain Drum-Boiler System, Cheung-Chieh Ku
Journal of Marine Science and Technology
This paper discusses a robust control problem of uncertain drum-boiler system subject to H2 and passivity performances. The main aims of H2 control scheme are to minimize output energy and guarantee robust asymptotical stability. Besides, passivity theory is applied to constrain effect of external disturbance on the system. Based on Lyapunov function, some sufficient conditions are derived into Linear Matrix Inequality (LMI) form that can be directly calculated by the convex optimization algorithm. Through solving the derived sufficient conditions, a controller can be established to guarantee robust asymptotical stability and mixed H2/Passivity performance of uncertain drum-boiler system. Based on simulation …
Ultra-Large Grain Pure Copper Microstructure Under Low Cycle Fatigue, Hsing-Lu Huang, Shih-Wei Mao, Tz-Li Hu, Dershin Gan, New-Jin Ho
Ultra-Large Grain Pure Copper Microstructure Under Low Cycle Fatigue, Hsing-Lu Huang, Shih-Wei Mao, Tz-Li Hu, Dershin Gan, New-Jin Ho
Journal of Marine Science and Technology
The dislocation structure evolution in polycrystalline copper at constant strain amplitude during low cycle fatigue is well understood. Single crystal, ultra-large grain polycrystalline copper dislocation development has received little attention. Ultra-grain polycrystalline copper with 600 m average grain size was used in this study to investigate the dislocation development at different fatigue strain amplitudes. The results show that; (1) the stress curve vs. number of cycles (S-N curve) produces hardening in the first stage followed by softening regardless of the strain amplitude. At the same time, no plateau is found in the S-N curves. (2) The fatigue saturation stress increases …
A Risk Assessment Model For Buildings Of Reinforced Concrete Containing High Concentrations Of Chloride Ions, Tsai-Lung Weng
A Risk Assessment Model For Buildings Of Reinforced Concrete Containing High Concentrations Of Chloride Ions, Tsai-Lung Weng
Journal of Marine Science and Technology
Risk assessment is crucial to the safety and durability of buildings constructed using concrete with high concentrations of chloride ions. This study adopted grey statistical clustering and multi-phase fuzzy statistics in the development of a risk assessment model for existing reinforced concrete buildings. In the proposed model, evaluative indicators are divided into two categories: strength category included compressive strength and corrosion category included carbonation depth, chloride ion content, and steel corrosion current. Overall, the risk to the building can be divided into three levels (low, medium, and high) based on critical values in risk evaluation strategies, parameter weights, and grey …
Generation Control Schemes For Preventing Overloading Of Ehv Substation Main Transformer, Yi-Kuan Ke, Pei-Hwa Huang
Generation Control Schemes For Preventing Overloading Of Ehv Substation Main Transformer, Yi-Kuan Ke, Pei-Hwa Huang
Journal of Marine Science and Technology
The main purpose of this paper is to study the control of power plant generation under outage of main transformer in the adjoining substation. The control of power plant generation aims to prevent overloading of the remaining transformer and hence to maintain system operation security. The proposed control methods include two schemes of operation on the generating units: Direct Transfer Trip (DTT) and Generation Reduction (GR). A sample local power system with an EHV substation and two generation plants is investigated and thus the two control schemes are illustrated by analyzing system power flow and system dynamics. It is found …
Mechnical Strength And Durability Of Alkali-Activated Fly Ash/Slag Concrete, Maochieh Chi
Mechnical Strength And Durability Of Alkali-Activated Fly Ash/Slag Concrete, Maochieh Chi
Journal of Marine Science and Technology
This study investigated the mechanical strength and durability of alkali-activated binders composed of blends of fly ash (FA) and ground granulated blast furnace slag. Five samples with FA/slag ratios of 100/0, 75/25, 50/50, 25/75, and 0/100 by mass were employed to prepare alkali-activated FA/slag (AAFS) concrete. Sodium oxide (Na2O) concentrations of 6% and 8% of binder weight and activator modulus ratios (mass ratio of SiO2 to Na2O) of 0.8, 1.0, and 1.23 were used to prepare alkaline activators. Test results revealed that higher slag contents, Na2O concentrations, and activator modulus ratios increased the compressive strength and splitting tensile strength of …
Application Of An Extension Neural Network Method For Fault Diagnosis Of Three-Level Inverters Used In Marine Vessels, Kuei-Hsiang Chao, Yu-Ren Shen
Application Of An Extension Neural Network Method For Fault Diagnosis Of Three-Level Inverters Used In Marine Vessels, Kuei-Hsiang Chao, Yu-Ren Shen
Journal of Marine Science and Technology
This study proposes an extension neural network (ENN) algorithm to carry out the fault diagnosis of an inverter in a motor drive system for marine vessels. First, we use PSIM software to construct a three-level neutral point clamped (NPC) inverter, which simulates the occurrence of the fault of any power transistor in the NPC inverter. Simultaneously, we use fast Fourier transforms to transcribe the waveform of phase voltage in the time domain during the fault of any power transistor entering the spectrum in the frequency domain, looking for the corresponding characteristic spectrum during the fault of the power transistor. Next, …
Dynamic Economic Relations Among Steel Price Indices, Ming-Tao Chou
Dynamic Economic Relations Among Steel Price Indices, Ming-Tao Chou
Journal of Marine Science and Technology
Bulk shipping is now a globalized industry, with market prices entirely dependent on the world’s economic climate. For the bulk shipping market, the steel price index is a crucial standard of reference. In a global industry, the ability to understand the international relationship between changes in information and their effects on economics can help to reduce losses caused by the uncertainty of risk. Because the types of ships and contracts used in bulk shipping are wide-ranging, market participants tend to have difficulty in determining market price changes and trends, and are therefore forced to face greater market uncertainty and volatility. …
Study Of Factors Influencing Mobile Ticketing Adoption: Status Quo Bias Perspective, Qun Zhao, Chun-Der Chen, Jin-Long Wang, Kuang-Ju Wang
Study Of Factors Influencing Mobile Ticketing Adoption: Status Quo Bias Perspective, Qun Zhao, Chun-Der Chen, Jin-Long Wang, Kuang-Ju Wang
Journal of Marine Science and Technology
The purpose of this study is to employ the status quo bias theory to determine the key factors behind the adoption of mobile ticketing by mobile users. Using a survey of 241 mobile ticketing users, structural equation modelling is applied to analyze the validity and reliability of the results. We find that perceived value, self-efficacy, and system support are the most important predictors of switching to mobile ticketing, with perceived value the dominant effect. Hence, it is important to emphasize the benefits of mobile ticketing to increase the perceived value to potential users. Furthermore, a seamless mobile ticketing system with …
Bearing Boundary Element Method Based On Geometrically Similar Roller Conditions, Xia Yang, Ya-Chao Li, Chuang Yan, Guang-Ming Liu, Jian-Mei Wang, Hai-Lian Gui
Bearing Boundary Element Method Based On Geometrically Similar Roller Conditions, Xia Yang, Ya-Chao Li, Chuang Yan, Guang-Ming Liu, Jian-Mei Wang, Hai-Lian Gui
Journal of Marine Science and Technology
To solve the three-dimensional pressure and load distribution of roller bearings, a new boundary element method (BEM) is presented in this report. First, a discrete model of the initial location roller was established, and the other rollers’ discrete data could be obtained using geometrically similar conditions of this model. Based on the three-dimensional elastic contact BEM, all of the bearing rollers could be described as one object; therefore, the roller bearing problem of a multi-object contact system could be simplified as the problem of a threeobject contact system. Bearing boundary elements were used to realize the discontinuous traction on the …
Fuzzy Control Via Imperfect Premise Matching Approach For Discrete Takagi-Sugeno Fuzzy Systems With Multiplicative Noises, Wen-Jer Chang, Che-Pin Kuo, Cheung-Chieh Ku
Fuzzy Control Via Imperfect Premise Matching Approach For Discrete Takagi-Sugeno Fuzzy Systems With Multiplicative Noises, Wen-Jer Chang, Che-Pin Kuo, Cheung-Chieh Ku
Journal of Marine Science and Technology
In this paper, a fuzzy controller design problem is considered for the discrete-time stochastic Takagi-Sugeno fuzzy systems. The main purpose of this paper is to provide a less conservative fuzzy controller design method for the discretetime nonlinear stochastic systems, which are modeled by the T-S fuzzy models. Based on the concept of imperfect premise matching, the fuzzy controller is designed without the limitation imposed from sharing the same membership functions of fuzzy model. In other words, the imperfect premise matching technique provides a generalization approach in designing fuzzy controller. Moreover, the flexibility and robustness of proposed fuzzy controller design approach …
Mechanical Behaviors Of Piled-Raft Foundation And Diaphragm Wall In Deep Excavation Of Taipei Metropolitan, Der-Guey Lin, Wen-Tsung Liu, Jui-Ching Chou
Mechanical Behaviors Of Piled-Raft Foundation And Diaphragm Wall In Deep Excavation Of Taipei Metropolitan, Der-Guey Lin, Wen-Tsung Liu, Jui-Ching Chou
Journal of Marine Science and Technology
The piled-raft foundation has been widely used in recent years to solve the low bearing capacity and the excess settlement problems of the raft foundation on the soft soil. The soft soil is reinforced by the pile and behaviors of the diaphragm wall and the raft are also modified by the pile. However, effects of the pile on the diaphragm wall and the raft have not been fully discussed in the past. In this paper, a finite element program, Plaxis-3D, is used as the numerical simulation tool. First, simulations of pile loading tests are performed to verify the input parameters …
Examining The Behaviors Of Sandy And Silty Seabed Under Wave Actions, Yuchen Wang, Erwin Oh, Jiemin Zhan
Examining The Behaviors Of Sandy And Silty Seabed Under Wave Actions, Yuchen Wang, Erwin Oh, Jiemin Zhan
Journal of Marine Science and Technology
Coastal structures are always facing the threat of damage caused by different wave actions. A better understanding of different seabed behavior could effectively reduce the damage caused by waves. In this paper, a 2 Dimensional quasi-dynamic u-w-p model is developed to analyze the different behaviors of seabed composed of loose sand, dense sand and silt. In the u-w-p model, acceleration, velocity and displacement has been considered, and three important parameters: pore water pressure, effective stress and shear stress, are obtained from the model with Finite Difference Method (FDM) and applied to describe the general behavior of seabed consisting of various …
Longitudinal Surface Roughness Effects In Magnetic Fluid Lubricated Journal Bearings, Jaw-Ren Lin
Longitudinal Surface Roughness Effects In Magnetic Fluid Lubricated Journal Bearings, Jaw-Ren Lin
Journal of Marine Science and Technology
According to the magnetic fluid model incorporating with the stochastic model, the performance characteristics of a magnetic fluid lubricated short journal bearing with rough surfaces are investigated. A stochastic magnetic fluid based Reynolds equation has been derived. Analytical expressions for the bearing performances are also obtained. From the results obtained, the effects of longitudinal roughness patterns result in an increased load capacity as well as a reduced friction parameter and attitude angle. The amounts of increased load and reduced friction parameter are more pronounced for the bearing operating at higher values of the volume concentration, magnetic parameter, roughness parameter and …
Novel Fault Diagnosis Method Based On Chaos Eyes And Extension Neural Network For Wind Power Systems, Meng-Hui Wang, Pi-Chu Wu
Novel Fault Diagnosis Method Based On Chaos Eyes And Extension Neural Network For Wind Power Systems, Meng-Hui Wang, Pi-Chu Wu
Journal of Marine Science and Technology
This paper proposes a novel approach based on the chaos eye method (CEM) and extension neural network (ENN) for fault diagnosis of wind power systems. First, we used sensors to capture the vibration signals of the wind power system to detect subtle changes. Subsequently, the chaotic synchronization detection method was used to form a chaos error distribution diagram. The distribution diagram centroid, called chaos eye in this paper, was used as the fault diagnosis feature to reduce the number of extracted features. This reduction in diagnostic features enables considerably reducing the computation time and cost of hardware implementation. The ENN-based …
Simulation Of The Effect Of Breakwater On The Propagation Of Solitary Waves, Ching-Piao Tsai, Ying-Chi Chen, Chun-Jen Chen, Chang Lin
Simulation Of The Effect Of Breakwater On The Propagation Of Solitary Waves, Ching-Piao Tsai, Ying-Chi Chen, Chun-Jen Chen, Chang Lin
Journal of Marine Science and Technology
A numerical simulation of the effect of breakwater on the propagation of solitary waves was presented in this study using CFD based on the Reynolds-averaged Navier-Stokes (RANS) equations coupled with the renormalization group (RNG) turbulent model. The wave transformation and the flow field variation of solitary waves propagating over composite breakwaters of different heights were simulated. The effect of breakwater height on the run-up of solitary waves on the slope was discussed. The simulation results revealed a jet-like flow phenomenon when solitary waves passing over breakwaters due to the water level difference between the weather and lee sides of the …
Intelligent Identification Of Fires In Ship Compartments Using A Bayesian Network, Tian-Hua Xie, Yan Lin, Wei Chi, Zu-Yao Yang
Intelligent Identification Of Fires In Ship Compartments Using A Bayesian Network, Tian-Hua Xie, Yan Lin, Wei Chi, Zu-Yao Yang
Journal of Marine Science and Technology
Fire is always a severe threat to ship safety and survival. To prevent the spread of a fire and eliminate serious accidental consequences, it is imperative for commanders to promptly identify the size and type of the fire so as to take rapid and effective firefighting action. In this study, the architectural design of an advanced ship fire identification system (SFIS) is presented that makes timely and critical decision support for selecting suitable suppression methods and firefighting tactics. Based on a Bayesian network (BN), a novel intelligent identification model that is capable of identifying small, medium or large fires and …
Winter Sea Fog Detection Using Trmm Microwave Measurements Over The Taiwan Strait, Nan-Ching Yeh, Wann-Jin Chen, Gin-Rong Liu, Chung-Chih Liu
Winter Sea Fog Detection Using Trmm Microwave Measurements Over The Taiwan Strait, Nan-Ching Yeh, Wann-Jin Chen, Gin-Rong Liu, Chung-Chih Liu
Journal of Marine Science and Technology
The impact of fog on activities such as land transportation, flight and marine operations, and military missions can be dangerous. Thus, this study developed a new and simple method for detecting fog areas over the Taiwan Strait more accurately during winter by using the Tropical Rainfall Measuring Mission Microwave Imager (TMI) Level-1B calibrated brightness temperature (TB) data, combined with ground station fog observations. This method is based on the microwave TB differences among four TMI channels, including horizontal and vertical polarization TBs of 37.0 and 85.5 GHz, for heavy fog and clear weather conditions. The method can be applied to …
Application Of A Residual-Norm-Based Algorithm To Solve Elliptic Boundary Value Problems, Yung-Wei Chen, Chun-Ming Chang, Hui-Ming Fang, Pai-Chen Guan
Application Of A Residual-Norm-Based Algorithm To Solve Elliptic Boundary Value Problems, Yung-Wei Chen, Chun-Ming Chang, Hui-Ming Fang, Pai-Chen Guan
Journal of Marine Science and Technology
In this study, we use a residual-norm-based algorithm (RNBA) to solve nonlinear elliptic boundary value problems (BVPs) on an arbitrary planar domain. For complex geometries, BVPs are very difficult and time-consuming to solve using conventional finite difference methods (FDMs). To overcome these problems, we apply a novel finite difference method (NFDM). By adding a fictitious rectangular domain and a bilinear function, we can easily treat geometrically complex boundary conditions. Then, through the use of the internal residual and the boundary residual, we can easily obtain the solution without the necessity of computing a matrix inverse. The RNBA avoids the oscillations …
Gain-Margins And Phase-Margins Of Multivariable Time-Delay Systems, Tsung-Huang Ma, Chih-Min Lin, Fei Chao, Chun-Fei Hsu, Jih-Gau Juang, Ching-Hung Lee
Gain-Margins And Phase-Margins Of Multivariable Time-Delay Systems, Tsung-Huang Ma, Chih-Min Lin, Fei Chao, Chun-Fei Hsu, Jih-Gau Juang, Ching-Hung Lee
Journal of Marine Science and Technology
In this paper, the gain-phase-margin tester method is applied to analyze the gain-margins (GMs) and phase-margins (PMs) of multi-input multi-output (MIMO) control systems with time-delays. The objectives of the proposed method are: (1) to present the basic definitions and physical meanings of GMs and PMs of MIMO control systems; (2) to give some important remarks on how to construct proper block diagrams for those systems originally expressed by state equations; (3) to analyze the GMs and PMs of a missile autopilot system. The analysis results are checked by the use of Nyquist plots and computer simulations.
Optimal Design Of Operation Parameters On Performance Of Pemfc, Ying-Pin Chang
Optimal Design Of Operation Parameters On Performance Of Pemfc, Ying-Pin Chang
Journal of Marine Science and Technology
This paper presents a method for combining sequential neural-network approximation and orthogonal arrays (SNAOA) in determining the operation parameters on the performance of the proton exchange membrane fuel cell (PEMFC). An orthogonal array was first conducted to obtain the initial solution set. The results obtained from the orthogonal array were then used as the experimental data for response surface methodology (RSM) that could predict the operation parameters at discrete levels. The set was then treated as the initial training sample. Next, a back-propagation sequential neural network was trained to simulate the feasible domain for seeking optimal operation parameters of PEMFC. …
Monocular Image-Based Local Collision-Free Path Planning For Autonomous Robots, I-Hsum Li, Ming-Chang Chen, Wei-Yen Wang, Shun-Feng Su, Yi-Han Chen
Monocular Image-Based Local Collision-Free Path Planning For Autonomous Robots, I-Hsum Li, Ming-Chang Chen, Wei-Yen Wang, Shun-Feng Su, Yi-Han Chen
Journal of Marine Science and Technology
Monocular image-based local collision-free path planning for autonomous robots is presented in this paper. According to a pre-set pair of parallel lines, transformation equations from the image domain to the real world domain are easily defined. Moreover, the distances to obstacles in the robot’s visual domain can be estimated. Our proposed method can not only easily identify obstacles and wall edges, but also estimate the distances and plan a collision-free path. Besides, this paper successfully integrates an image processing module with a local collision-free path planning, and also applies them to the collision-free and path planning of a mobile robot. …
Load Transfer And Deformation Analyses Of Piled-Raft Foundation In Taipei Metropolitan, Der-Guey Lin, Wen-Tsung Liu, Jui-Ching Chou
Load Transfer And Deformation Analyses Of Piled-Raft Foundation In Taipei Metropolitan, Der-Guey Lin, Wen-Tsung Liu, Jui-Ching Chou
Journal of Marine Science and Technology
Piled-raft systems are often suitable for foundations of highrise buildings to increase the bearing capacity and reduce the excessive settlement of foundations. However, the conventional design of the piled-raft foundation commonly ignores the bearing effect of the raft. A parametric study on the piled-raft foundation performance including the bearing effect for typical Taipei Subsoil is investigated using 3D FDM program, FLAC 3D. Input parameters of the parametric study are back calculated from a series of static pile loading tests implemented on the jobsite of TIFC (Taipei International Financial Corporation or Taipei 101). Parametric study results show that the loadcarrying ratio …
Chloride-Binding Isotherms In Concrete Submitted To Non-Steady-State Diffusion-Migration Model, Wen-Hu Tsao, Ming-Te Liang, Ta-Peng Chang
Chloride-Binding Isotherms In Concrete Submitted To Non-Steady-State Diffusion-Migration Model, Wen-Hu Tsao, Ming-Te Liang, Ta-Peng Chang
Journal of Marine Science and Technology
We propose a mathematical non-steady-state, time/depth dependent diffusion-migration model based on the modified Fick’s second law of diffusion. It considers the effects of different chloride binding mechanisms for the transport process of chloride ions diffused in a porous concrete on the variation of its chloride profile. Four different chloride-binding isotherms, i.e., no binding, linear binding, Langmuir binding and Freundlich binding, together with the time/depth dependent chloride diffusivities are investigated. Results of this study show that the variations of amounts of available free chloride ions in the solution of saturated concrete resulting from different chloride-binding isotherms have significant effects on the …
Strategies To Improve The Direct Search Method For Non-Convex Wind-Thermal Coordination Dispatch Problem Considering Transmission Capacity, Chun-Lung Chen
Strategies To Improve The Direct Search Method For Non-Convex Wind-Thermal Coordination Dispatch Problem Considering Transmission Capacity, Chun-Lung Chen
Journal of Marine Science and Technology
This paper presents some strategies to improve the direct search method (DSM) for solving the multi-area wind-thermal coordination dispatch (MWCD) problem considering the nonlinear characteristics of a generator such as valve-point effects. Although the DSM approaches have several advantages suitable to tackle the difficult non-convex economic dispatch (NED) problems, they still have the drawbacks such as exploration problem, exploitation problem and constraint handling problem. The main problem of the conventional DSM is that it gets easily trapped in a local optimal solution due to premature convergence. This paper proposes a stochastic direct search method (SDSM) employing the parallel stochastic searching …
Shape Optimization Of Two-Chamber Mufflers Hybridized With Multiple Parallel Dissipative Tubes Using Simulated Annealing Method, Ho-Chih Cheng, Min-Chie Chiu
Shape Optimization Of Two-Chamber Mufflers Hybridized With Multiple Parallel Dissipative Tubes Using Simulated Annealing Method, Ho-Chih Cheng, Min-Chie Chiu
Journal of Marine Science and Technology
Mufflers hybridized with a single dissipative tube have been extensively researched; however, there has been a palpable lack of work directed toward mufflers conjugated with multiple parallel dissipative tubes that disperse venting fluid and reduce secondary noise. That being so, an analysis of the Sound Transmission Loss (STL) of two-chamber mufflers with multiple parallel dissipative tubes that are optimally designed to perform within a limited space will be considered, here. By using a decoupled numerical method, a four-pole system matrix for evaluating acoustic performance (STL) emerges. During the optimization process, a simulated annealing (SA) method, which is a robust scheme …
Dynamic Simulation Of Subsea Equipment Installation Using An Offshore Support Vessel Based On Flexible Multibody System Dynamics, Jeong-Woo Hong, Myung-Il Roh, Seung-Ho Ham, Sol Ha
Dynamic Simulation Of Subsea Equipment Installation Using An Offshore Support Vessel Based On Flexible Multibody System Dynamics, Jeong-Woo Hong, Myung-Il Roh, Seung-Ho Ham, Sol Ha
Journal of Marine Science and Technology
An offshore support vessel (OSV) is a ship that supports exploration, development, and production activities in the offshore industry. Recently, industrial demand for OSVs has increased due to a large number of offshore field development projects worldwide. One of the main functions of an OSV is heavy lifting such as subsea equipment installations in offshore oil or gas fields using crane. Therefore, predicting dynamic loads in various operation conditions is one of the crucial points in the lifting operation of an OSV. To do this, crane-lifting simulation needs to precede real operation to verify the safety of the lifting operation. …
Study On The New Variant Of Particle Swarm Method For Optimization Design, Jinn-Tong Chiu, Chih-Chung Fang
Study On The New Variant Of Particle Swarm Method For Optimization Design, Jinn-Tong Chiu, Chih-Chung Fang
Journal of Marine Science and Technology
A new variant of Particle Swarm Optimization (PSO) is developed to improve the performance of PSO, which has been widely used in various fields for optimization. The proposed PSO incorporates a space partitioning technique in grid method with PSO. In the searching process of the new algorithm, three position vectors are introduced to enhance the exploration of the particles in the population of PSO and hence helpful for a global optimization problem of interest. First, the proposed variant of PSO is verified by applying it to the seven benchmark functions and thereafter proved from the results as a robust one. …
Anchovy Distributional Properties By Time And Location: Using Acoustic Data From A Primary Trawl Survey In The South Sea Of South Korea, Yeongguel Park, Young Il Seo, Taeg Yun Oh, Kyounghoon Lee, Hui Zhang, Myounghee Kang
Anchovy Distributional Properties By Time And Location: Using Acoustic Data From A Primary Trawl Survey In The South Sea Of South Korea, Yeongguel Park, Young Il Seo, Taeg Yun Oh, Kyounghoon Lee, Hui Zhang, Myounghee Kang
Journal of Marine Science and Technology
In South Korea, acoustic data from primary trawl surveys are not exploited. Thus, the objective of this study was to present the availability of acoustic data from a primary trawl survey by examining the distributional properties of anchovy schools by time (morning and afternoon) and location (inshore and offshore). Echosounder data were collected while conducting a trawl survey in the South Sea of South Korea on April 14-18, 2014. In six of eight trawl shots, the major species was anchovy Engraulis japonicus (> 95% of total catch weight). Consequently, the length, thickness, area, and volume backscattering strength (SV) of morning …