• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.310-311
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• 2011

In this paper, refer to necessity about independent navigation system for back up of GPS by LORAN-C and suggest a solution of Co-location modeling of LORAN-C with DGPS and analysing for the interference.

• Journal of Electrical Engineering and Technology
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• v.12 no.6
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• pp.2365-2377
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• 2017

This paper addresses two interrelated problems concerning the tracking control of pod propulsion unmanned surface vessel (USV), namely, the modeling of pod propulsion USV, and tracking controller design. First, based on MMG modeling theory, the model of pod propulsion USV is derived. Furthermore, a practical adaptive neural tracking controller is proposed by backstepping technique, neural network approximation and adaptive method. Meanwhile, unlike some existing tracking methods for surface vessel whose control algorithms suffer from "explosion of complexity", a novel neural shunting model is introduced to solve the problem. Using a Lyapunov functional, it is proven that all error signals in the system are uniformly ultimately bounded. The advantages of the paper are that first, the underactuated characteristic of pod propulsion USV is proved; second, the neural shunting model is used to solve the problem of "explosion of complexity", and this is a combination of knowledge in the field of biology and engineering; third, the developed controller is able to capture the uncertainties without the exact information of hydrodynamic damping structure and the sea disturbances. Numerical examples have been given to illustrate the performance and effectiveness of the proposed scheme.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.285-286
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• 2016

We aim to propose the prediction modeling method of ship's position with extracting ship's trajectory model through pattern recognition based on the data that are being collected in VTS centers at real time. Support Vector Machine algorithm was used for data modeling. The optimal parameters are calculated with k-fold cross validation and grid search. We expect that the proposed modeling method could support VTS operators' decision making in case of complex encountering traffic situations.

• 한국지구물리탐사학회:학술대회논문집
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• 2010.10a
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• pp.195-198
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• 2010

• International Journal of Naval Architecture and Ocean Engineering
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• v.2 no.2
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• pp.96-103
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• 2010

A concept of preliminary design for mid-size superyachts is explored. First, the profile of a superyacht is interactively designed with the help of freeform curve functionality and graphical user interface (GUI) based interaction. The hull form is then constructed using major characteristic curves such as design waterline, deck sideline, and sections in addition to the predefined profile curve. After exterior hull modeling is done, the arrangement of significant interior spaces of all decks is carried out. A genetic algorithm is exploited to find a space arrangement by considering space fitness values, space proximity, and stairs connectivity of relevant spaces. A goal of the paper is to offer a step-by-step procedure for superyacht design from scratch or when initial information is not sufficient for complete design. For this purpose, a GUI based superyacht design system is developed. This design approach is expected to help users interactively design mid-size superyachts.

• Journal of the Korean Institute of Navigation
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• v.24 no.1
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• pp.35-45
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• 2000

Recently, in the shipping companies have been employing prudently in order to prevent from sea accidents occurred by human factors. Also the students of merchant marine universities are choosing prudently the shipping companies when taking a job. But many qualitative and quantitative factors are considered in decision making for the employment and the choice of a company. FSM(Fuzzy Structural Modeling) has been widely used in modeling the system composed of such qualitative and quantitative factor. In this paper, a case study is discussed for the analysis of the consciousness of the employment of shining companies and students' choice of such company in maritime university using FSM. Also this paper proposed the planes for educating and recruitment guiding the student in maritime university.

• International Journal of Naval Architecture and Ocean Engineering
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• v.8 no.5
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• pp.496-510
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• 2016

Simulation technology is a type of shipbuilding product lifecycle management solution used to support production planning or decision-making. Normally, most shipbuilding processes are consisted of job shop production, and the modeling and simulation require professional skills and experience on shipbuilding. For these reasons, many shipbuilding companies have difficulties adapting simulation systems, regardless of the necessity for the technology. In this paper, the data model for shipyard production simulation model generation was defined by analyzing the iterative simulation modeling procedure. The shipyard production simulation data model defined in this study contains the information necessary for the conventional simulation modeling procedure and can serve as a basis for simulation model generation. The efficacy of the developed system was validated by applying it to the simulation model generation of the panel block production line. By implementing the initial simulation model generation process, which was performed in the past with a simulation modeler, the proposed system substantially reduced the modeling time. In addition, by reducing the difficulties posed by different modeler-dependent generation methods, the proposed system makes the standardization of the simulation model quality possible.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1334-1337
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• 2011

HLA(High Level Architecture)는 분산 환경의 모델링 및 시뮬레이션(Modeling & Simulation)을 위한 공통 아키텍처를 제공하는 기술 표준이며, RTI(Run-Time Infrastructure)를 통해 HLA 서비스를 제공한다. HLA는 연동 객체 모델인 FOM(Federation Object Model)을 기반으로 시뮬레이션 환경을 구성하며, 시뮬레이션에 참여하는 모든 시뮬레이터는 동일한 FOM을 소유해야 한다. 따라서 시뮬레이션 체계 간 연동을 수행하기 위해서는 FOM을 통합하거나 FOM 간 연동을 위한 게이트웨이를 구현해야 한다. 한편, FOM을 통합하는 방법은 각 시뮬레이션의 연동 인터페이스 수정이 필요하기 때문에 게이트웨이를 구현하는 방법이 기존 시스템의 변경을 최소화할 수 있다. 따라서 본 논문은 HLA기반 시뮬레이션의 체계 간 연동을 제공할 수 있는 게이트웨이 구조를 제시한다. 특히, XML 형태의 객체 모델을 기반으로 교환 메시지를 정의하고, 메시지 처리 모듈을 게이트웨이에 플러그인 함으로써 시뮬레이션 체계 간 연동의 용이함을 보여준다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1375-1378
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• 2011

국방 분야의 모델링 및 시뮬레이션(Modeling & Simulation) 분야에서 재사용성 및 상호운용성 확보는 기 개발된 모델을 연동하여 시뮬레이션을 확장할 수 있다는 측면에서 핵심이 된다. 이러한 핵심기술 확보를 위해 시뮬레이션 소프트웨어의 공통 컴포넌트를 설계하고, 표준 연동 미들웨어인 Run-Time Infrastructure(RTI)를 적용한 프레임워크가 개발되었다. 한편, 시뮬레이션 환경은 목적에 따라 시뮬레이션 모델의 기능이 달라지거나, 동일한 모델이 분산 컴퓨팅뿐만 아니라 단일 컴퓨팅 환경에서도 수행되도록 요구된다. 본 논문은 이러한 요구사항을 만족시킬 수 있도록 모델 연동을 위한 플러그인 방식의 인터페이스 설계 방안을 제시하고, 분산 시뮬레이션의 동일한 모델을 단일 시스템에서 시뮬레이션 할 경우 모델 컴포넌트 간 데이터 교환 및 메시지 순서화를 제공할 수 있는 메커니즘을 기술한다.

• Journal of Navigation and Port Research
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• v.29 no.6 s.102
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• pp.487-493
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• 2005

Since the destruction of World Trade Center the attention of the United States and the wider international community has focussed upon the need to strengthen security and prevent terrorism This paper suggests an analysis prior to risk factor and structure for anti-terrorism in the korean maritime society. For this, in this paper, maritime terror risk factor was extracted by type and case of terror using brainstorming method. Also, risk factor is structured by FSM method and analyzed for ranking of each risk factor by AHP. At the result, the evaluation of risk factor is especially over maximum factor for related external impact.