• Journal of the Korean Society of Marine Environment & Safety
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• v.16 no.4
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• pp.393-399
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• 2010

Recently, a vessel's maneuvering performance is considered to be an important subject as marine pollution from the ships that stranded on a rock becomes more severe. So, IMO(International maritime organization) has adopted Resolution MSC.l37 to enhance international standards of ship's maneuverability. There's more than one way to improve ship's maneuverability. This research focused on improving ship's maneuverability by high-lift rudder. To predict the maneuverability, the numerical simulation model was used. The evaluation of maneuverability was carried out by turning test and zig-zag test. The results obtained with these simulation showed that the high-lift rudder would be effective in improving the turning ability of the ship. But it was clarified that there Has a possibility that course changing ability night become bad through an increase of rudder lift.

• Journal of the Korea Society of Computer and Information
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• v.28 no.8
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• pp.111-118
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• 2023

In this paper, we propose a WiFi-based joystick with an acceleration sensor and a vibration sensor that can be used in flight simulators and VR fields. The flight simulator is a technology belonging to the ICT and SW application field and provides a simulation environment that reproduces the aircraft environment. Existing flight simulator control devices are fixed to a specific device and the user's activity area is limited. In this paper, a 3D space manipulation device was implemented for the user's free use of space. In addition, the proposed control device is designed as a WiFi communication board and display that displays information and performs 3-axis sensing for accurate and sophisticated control compared to existing VR equipment controllers. And the applicability was confirmed by implementing a Unity-based virtual environment. As a result of the implementation device verification, it was confirmed that the control device operates normally through the communication interface, It was confirmed that the sensing values in the game and the sensing values measured on the implemented board matched each other. The results of this study can be used for VR and various metaverse related contents in addition to flight simulators.

• Composites Research
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• v.36 no.3
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• pp.211-216
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• 2023

When designing ships and aircraft structures, it is important to design them to satisfy weight reduction and strength. Currently, studies related to topology optimization using 3D printed composite materials are being actively conducted to satisfy the weight reduction and strength of the structure. In this study, structural analysis was performed to analyze the applicability of 3D printed composite materials to the flight control surface, one of the parts of an aircraft or unmanned aerial vehicle. The optimal topology shape of the flight control surface for the bending load was analyzed by considering three types (hexagonal, rectangular, triangular) of the topology shape of the flight control surface. In addition, the bending strength of the flight control surface was analyzed when four types of reinforcing materials (carbon fiber, glass fiber, high-strength high-temperature glass fiber, and kevlar) of the 3D printed composite material were applied. As a result of comparing the three-point bending test results with the finite element method results, it was confirmed that the flight control surface with hexagonal topology shape made of carbon fiber and Kevlar had excellent performance. And it is judged that the 3D printed composite can be sufficiently applied to the flight control surface.

• Journal of Korean Society for Geospatial Information Science
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• v.1 no.2 s.2
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• pp.177-184
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• 1993

To obtain large scale precise geographical information in local area we determined external orientation parameters of camn exactly and conducted aerial photography using remote control airship loaded 35mm non-metric camera that produced systematic error coefficients. Ground control Points were determined by differential GPS. Therefore we can try to improve accuracy and economical efficiency. Also, it is suggested that remote control airship photogrammetry can be applied to make large scale topographic map using analytical plotter as calibrated accuracy.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.33-35
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• 2019

해상구조물은 그 특성상 해상에서 고립되어 있고, 액체상태 또는 가스 상태의 탄화수소 등을 다루고 있어 사고발생시 대형사고로 이어질 가능성이 크다. 이에 해상구조물에는 유엔해양법협약에 따라 500m라는 넓이의 안전수역이 설정되어 있으며 추가로 설정되는 제한 수역은 명확한 근거 없이 상이한 넓이로 설정되어 있다. 이에 본 연구에서는 선박의 조종성능 및 해상구조물에서 다루는 화물의 고유한 위험특성을 파악하여 표준화된 안전수역을 설정하는 방안을 제시하고자 한다. 이에는 국제해사기구의 조종성능기준인 선회경의 크기제한, 초기선회성능, 정지성능 등이 있다. 본 연구는 정량화된 안전수역 및 제한수역 설정 등에 대한 기준을 제시하는 데 도움을 줄 수 있을 것으로 사료된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.83-84
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• 2009

최근 다양한 센싱장치와 HCI 디바이스를 결합하여 로봇이나 기계장치를 구동하려는 연구가 활발하게 진행되고 있다. 또한 기존의 RC방식의 무인비행체 조작은 관련분야의 전문성을 필요로 할 만큼 접근하기 어려운 면이 있었다. 이에 본 논문에서는 소형 무인비행체(UAV)의 움직임 제어를 위해 데이터 글로브의 손가락 구부러짐을 인식하여 이를 통해 무인비행체를 조작하는 원격조종장치에 관한 시스템 구조 및 프로토콜을 제안한다. 이 시스템을 통해 비전문가로 하여금 무인비행체의 접근성을 높이며 다양한 분야에 활용 할 수 있는 가능성을 제시하고자 한다. 이를 위해 데이터 글로브의 센싱 데이터에 대한 조합 및 해석방식을 정의하고, 이를 데이터 글로브의 손가락 구부러짐 해석에 적용하였다. 또한 조합된 명령신호를 전송하는 무인비행체의 구동 제어를 위한 비동기 Uplink 프로토콜을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.89-90
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• 2017

다각도로 촬영할 수 있는 드론을 손동작으로 비행할 수 있고 드론이 자율비행을 하면서 동영상 및 사진을 촬영하여 드론에 장착된 플래시 메모리에 저장 및 근거리 무선통신으로 지상 방송국에 전송을 한다. ※ 카메라 연동 기술적 이슈로 인해, 참가 일정 내 카메라 부분 미완성 가능성 있음.

• Journal of Korea Ship Safrty Technology Authority
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• v.6
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• pp.29-39
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• 2001

본 논문에서는 차세대 고속선에 적합한 선형의 하나로 거론되고 있는 삼동선의 개발 현황을 살펴보고, 실선으로의 가능성을 파악하기 위하여 적용 대상선을 2,500톤급 삼동형 함정으로 설정하여 개념설계를 수행한 결과를 보이고자 한다. 함정의 설계조건과 요구사항에 적합하도록 삼동선의 장점을 최대한 반영하여 초기 개념 설계를 수행하였으며, 이로부터 도출된 삼동선형의 유체역학적인 성능검토를 위해 저항추진, 내항 및 조종성능에 대한 연구를 수행하고 그 결과를 유사 단동선과 비교, 검토하였다. 연구결과의 가시화를 위하여 최종적으로 3차원 컴퓨터 그래픽 모델링하고, 실선의 1/100 축적모형을 제작하여 설계결과를 표현하였다.

• Journal of the Society of Naval Architects of Korea
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• v.33 no.4
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• pp.1-14
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• 1996

Especially in the case of a full form ship, the stability on course can be considered to become severest among 4 items of criteria in Interim Standards for Ship Maneuverability adopted by IMO in 1993. The purpose of this study is to find some ideas for the improvement of stability on course through changes in rudder area with reference to span distance. In this paper, we established the formula on the relation between the experimental constants relevant to rudder normal force and hydrodynamic derivatives of hull-propeller-rudder system. We carried out various kinds of captive model test relevant to rudder normal force etc., and evaluated hydrodynamic derivatives of hull-propeller-rudder system, and analyzed the stability on course with the parameter of changes in rudder area. Furthermore, we also discussed effects of changes in rudder area on maneuvering performance including stability on course, based on computer simulation. As a result, it is clarified that there is a possibility that stability on course may become bad through an increase of rudder area. The reason for the bad stability on course is that the void space between the upper edge of rudder and the lower part of stern overhang decreases. This space change exerts a great influence on straightening coefficient of incoming flow to rudder in maneuvering motion, which has close relation to stability on course.

• Science of Emotion and Sensibility
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• v.26 no.1
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• pp.65-78
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• 2023

Aircraft are representative of human-machine systems. There is a delay between the human operation and the completion of the machine operation such as when the machine starts to operate and when the force is transmitted to the machine and completed. Time perception is an important component of timing tasks and is known to be affected by the anxiety associated with high arousal. This research verified the impact of weather, flight, and time conditions on the anxiety and time perception of in-service pilots in a virtual reality area. Weather conditions were divided into visual flight weather conditions and very low visibility conditions. Experiments 1 and 2 were performed with different flight and time conditions. In Experiment 1, time perception was measured by employing a button added to the control rod in the scenario of hovering and level flight with relatively little transformed in momentum and little delay. In Experiment 2, time perception was measured in the procedure of naturally taking off the helicopter by employing only the control stick in a takeoff scenario where there was a lot of transformation in momentum and a lot of delays. As a result of the experiment, it was reported that anxiety and heart rate increased in very low visibility conditions In particular, among all flight conditions in Experiments 1 and 2, it was reported that time was overestimated in the scenario of increased anxiety. This outcome can lead to overestimation of time under the impact of anxiety and failure of the timing task, which may lead to challenges in maneuvering and possibly lead to accidents.