• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.65-70
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• 2000

Flying an aircraft is not like driving a train along a railway track. There are many factors that may affect an aircraft's course, including the wind speed and direction relative to the aircraft's intended flight path. This paper investigates noise exposed area by using INM. Especially, effect on aircraft route to minimise the number of people overflown by departing aircraft is evaluate. The result shows that track keeping scheme is effective to reduce the noise area. On the other track at 4000ft is negligible to the noise contour.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2016년도 춘계학술대회
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• pp.308-309
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• 2016

본 논문은 선박의 자동항법 시스템에서 주요한 부분인 항로추종 유도 기법을 다루고 있다. 특히, 웨이포인트(way-point)기반, 인클로져(enclosure)기반, 룩어헤드(lookahead)기반의 항로추종 유도기법의 성능에 관해 살펴본다. 아울러 본 논문에서는 항로추종 시 선박의 조타제어를 위해 PID제어 시스템이 적용된다. 최종적으로 3가지 유도기법의 성능은 시뮬레이션 결과를 통해 평가된다.

• International Journal of Control, Automation, and Systems
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• 제2권2호
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• pp.171-181
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• 2004

An autonomous navigation algorithm for marine vehicles is proposed in this paper using fuzzy logic under COLREG guidelines. The VFF (Virtual Force Field) method, which is widely used in the field of mobile robotics, is modified for application to the autonomous navigation of marine vehicles. This Modified Virtual Force Field (MVFF) method can be used in either track-keeping or collision avoidance modes. Moreover, the operator can select a track-keeping pattern mode in the proposed algorithm. The collision avoidance algorithm has the ability to handle static and/or moving obstacles. The fuzzy expert rules are designed deliberately under COLREG guidelines. An extensive simulation study is used to verify the proposed method.

• 한국군사과학기술학회지
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• 제11권2호
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• pp.116-124
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• 2008

Current paper investigates the dynamic behavior and stability of an infrared search and track subjected to external disturbance having gimbal structure with three rotating axes keeping constant angular velocity in the azimuth direction. Euler-Lagrange equation is applied to derive the coupled nonlinear dynamic equation of motion of infrared search and track and the characteristics of dynamic coupling are investigated. Two equilibrium points with small variations from the nonlinear coupling system are derived and the specific condition from which a coupled equation can be three independent equations is derived. Finally, to examine the stability of system, Lyapunov direct method was used and system stability and stability boundaries are investigated.

• Journal of Astronomy and Space Sciences
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• 제22권4호
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• pp.527-536
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• 2005

태양과 달에 의한 섭동력은 정지궤도 위성 궤도 평면의 수직 방향으로 영향을 미쳐 궤도경사각과 승교점 적경을 변화시킨다. 궤도경사각의 변화는 정지궤도 위성의 직하점 위도를 변화시키며 그 크기는 궤도경사각 크기와 같다. 따라서 추력기를 사용하여 위성의 궤도경사각과 승교점 적경을 조정함으로써 직하점 위도를 일정한 범위 내에서 유지시킬 필요가 있으며 이것이 정지궤도 위성의 남북방향 위치유지 (North-South station keeping)이다. 본 연구에서는 Track-Back Chord Target(TBCT), Maximum Compensation Target(MCT), Minimum Fuel Target(MFT) 기법의 비교 분석을 통해 통신해양기상위성 1호에 가장 적합한 남북방향 위치유지 기법을 결정하였다. 비교분석을 위해 세 가지 기법을 이용하여 2008년 12월부터 1년간 남북방향 위치유지 시뮬레이션을 수행하였다. 그 결과 통신해양기상위성 1호의 남북방향 위치유지 기법으로 1년간 필요한 속도증분이 가장 적은 MFT 기법과 위치유지시 궤도경사각 진화 범위가 가장 작은 TBCT 기법이 적합하다고 판단하였다.

• Journal of Astronomy and Space Sciences
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• 제14권1호
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• pp.150-157
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• 1997

인공위성의 궤도경사각을 제어하는 남/북 위치보존은 많은 연료를 소모하기 때문에 연료량을 효율적으로 절감할 수 있는 방법의 연구가 중요하다. 이를 위하여 궤도경사각의 변화를 영년항과 주기항으로 나누어 영년변화만을 보정함으로써 기동 연료량을 줄이는 MFT(Minimum Fuel Target)기법을 이용하여 무궁화 위성의 남/북 위치보존을 모의실험하였다. 임무기간(약 10년)동안 모의 실험한 결과를 남/북 위치보존을 위한 다른 두가지 방법인 MCT(Maximum Compensation Target)기법과 TBCT(Track-Back Cho가 Target) 기법으로 구한 연료량과 비교하였다. MFT 기법을 사용할 경우 두 기법에 비해 각각 최소 47일과 15일의 임무기간이 연장되는 것으로 나타났다.

• 한국지능시스템학회논문지
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• 제15권4호
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• pp.498-504
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• 2005

본 논문에서는 퍼지 로직을 이용한 수중 로봇의 충돌 회피를 제안하였다. VFF(Virtual Force Field) 방법은 이동 로봇 분야에서 널리 사용하고 있는 충돌 회피 알고리즘이다. 본 논문에서는 이를 수중 로봇의 자율 항해를 위한 형태로 변형시킨 Modified Virtual Force Field(MVFF)를 제시하였다. 보다 정교한 알고리즘을 위해서 퍼지 로직을 이용한 MVFF를 구성하였고, 이를 수중 로봇의 경로 유지와 충돌 회피에 적용하였다 퍼지 로직은 수중 로봇의 자율 항해 동안 직면하게 되는 다양한 상황들을 다루었다. 제안한 충돌 회피 알고리즘은 다수개의 고정 장애물에 대해서 좋은 성능을 제시하였다. 시뮬레이션 결과를 통해 제안된 방법이 수중 로봇의 충돌 회피에 효과적으로 적용될 수 있음을 보였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.699-703
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• 2004

The autopilot system targets decreasing labor, working environment, service safety security and elevation of service efficiency. Ultimate purpose is minimizing number of crew for guarantee economical efficiency of shipping service. Recently, being achieving research about Course Keeping Control, Track Keeping Control, Roll-Rudder Stabilization, Dynamic ship Positioning and Automatic Mooring Control etc. which compensate nonlinear characteristic using optimizing control technique. And application research is progressing using real ship on actual field. Relation of Rudder angle which adjusted by Steering Machine and ship-heading angle are non-linear. And, Load Condition of ship acts as non-linear element that influence to Parameter of ship. Also, because the speed of a current and direction of waves, velocity and quantity of wind etc. that id disturbance act in non-linear form, become factor who make service of shipping painfully. Therefore, service system of shipping requires robust control algorithm that can overcome nonlinearity. In this paper, Using GA algorithm,design autopilot system of ship that could overcome the non-linear factor of ship and disturbance and examined result through simulation.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2003년도 추계공동학술대회
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• pp.145-156
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• 2003

This paper for real time object tracking in this treatise detect histogram analysis that is accumulation value of binary conversion density and edge information and body that move by real time use of difference Image techniques and proposed method to object tracking. Firstly, we extract edge that can reduce quantity of data keeping information about form of input image in object detection. Object is extracted by performing difference image and binarization in edge image. Area of detected object is determined by threshold value that divide sum of horizontal accumulation value about binary conversion density by value that add horizontalityㆍverticality maximum accumulation value. Object is tracked by comparing similarity with object that is detected in previous frame and present frame. As experiment result, proposed algorithm could improve the object detection speed, and could track object by real time and could track local movement.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.935-941
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• 2004

While the environment of usage of information and technology is getting stable and technology is being developed more deeply due to the globalization, making information, standardization, in order to make a fast response to the new industry strategy and business environment, mutual communication and management of correct and fast information are focused on as fundamental elements of keeping competitive power. Accordingly strategic development of urban transit operation organization, storage of information technology of urban railroad, and buildup of standard information infra are very important, so that computerized information system has been built up standardizing efficient maintenance framework of urban transit facilities. To maintain these facilities efficiently, storing the real-time information by standardizing the maintenance organization and building up computerized information system are very important with management of information history of existing maintenance work. Therefore, for the efficient maintenance of track system among urban transit facilities, standardized facilities classification and definition of management elements, and the plan of designing and building standardized database about track. system through standardizing technology resources are described in this paper.