Jong-Kap Lee

Atomic scale investigations of the Co/Pt(111) interface structure and magnetic properties

The interface structure of an ultrathin Co overlayer on a Pt(111) crystal was investigated with atomic-layer resolution medium-energy ion scattering spectroscopy and surface magneto-optical Kerr effect (SMOKE). For a 7 ML Co, interdiffusion begins at 673 K to form a heavily distorted Co–Pt surface alloy layer with little change in SMOKE intensity. However, annealing at 773 K formed a 30 atomic-layer-thick Co–Pt substitutional alloy with 3.7% maximum tensile strain, at which the SMOKE intensity increased more than 200%. The enhancement of the Kerr intensity is discussed with the interface alloy formation.

Estimation of Environmental Costs Based on Size of Oil Tanker Involved in Accident using Neural Network

The accident risks in the marine environment are increasing because of the tendency to build faster and larger ships. To secure ship safety, risk-based ship design (RBSD) was recently suggested based on a formal safety assessment (FSA). In the process of RBSD, a ship designer decides which risk reduction option is most cost-effective in the design stage using a cost-benefit analysis (CBA). There are three dimensions of risk in this CBA: fatality, environment, and asset. In this paper, we present an approach to estimate the environmental costs based on the size of an oil tanker involved in an accident using a neural network. An appropriate neural network model is suggested for the estimation,and the neural network is trained using IOPCF data. Finally,the learned neural network is compared with the cost regression equation by IMO MEPC 62/WP.13 (2011).

Design of Planning Level Ship Product Model for Ship Initial Design

This paper introduces a design of planning level ship product model (called SPPM hereinafter) based on ISO 10303 Standard for The Exchange of Product Model data (STEP). For the design of this model, the information modeling methodologies such as Integration Definition (IDEF) methods and Unified Modeling Language (UML) were reviewed, and a hybrid method was established. By using this method, ship initial design process was analyzed, and STEP-based information model and class libraries for SPPM were defined. For the data structure of this model, the shipbuilding Application Protocols (AP215, AP216 and Ship Common Model) of STEP were investigated and utilized to facilitate sharing of product model data with other CAD systems of subsequent stages. For the implementation and the verification of the model, a prototype system was developed using the ACIS geometric modeling kernel and object-oriented database management system.

The Safety Assessment of Small WIG Craft in the 20-Passenger Class

WIG crafts are a high speed vessel with features of dynamic supported craft. These crafts, which are predominantly of light weight and operate any substantially greater speeds than conventional craft such as bulk carrier, tanker, container ship, etc., could not be accommodated under traditional maritime safety instruments. It means that there is the need for risk and safety levels to be assessed on a holistic basis, recognizing that high levels of operator training, comprehensive and thoroughly implemented procedures, high levels of automation and sophisticated software can all make significant contributions to risk reduction. To response this requirement, the Interim Guideline for WIG craft(MSC/Circ.1054) were developed in the view of the configuration of WIG craft, which fall between the maritime and aviation regulatory regimes. This paper reviews a safety assessment process and methodology to be used in the design phase of a new ship. The process and methodology is based on the risk-based approach and is applied to safety assessment in concept development phase of small WIG craft in the 20-person class.

Model-Based Simulation for Container Loading/Unloading

Publisher Summary This chapter introduces model-based simulation system, which is able to assess ship stability during container loading/unloading using ENVISION, the general-purpose simulation system. The state-of-the-arts for simulation based design (SBD) technologies and related research, and developed container loading/unloading simulation system for high-speed medium size container ship using SBD technologies are investigated. The shape of hull form, compartment, cargo, and facilities is defined using the 3D commercial geometric modeling system. The application programs for stability assessment of ship are in-house programs. The Graphical User Interface for the visualization and control of input/output data is adopted for the efficient use of developed system. Simulation system for the visualization of stability and behavior of ship, the visualization of loading/unloading procedures, and the assessment of cranes optimal position using in-house computer aided engineering (CAE) programs, Graphical User Interface, geometric model, and simulation function is developed. SBD technologies can be applied usefully to engineering parts such as virtual shipyard, marine accident simulation, marine safety, and marine ergonomics.