• Journal of Navigation and Port Research
• /
• v.32 no.6
• /
• pp.439-445
• /
• 2008

Various turning tests were carried out according to the rudder angle, turning direction, and the speed etc. with the ship's maneuverability measuring system on the training ship HANBADA. After that they were compared with each other on the turning circle, maneuvering performance index and the distance of new course, and then found out that they were satisfied with the IMO maneuvering standards. And the turning circles of port were smaller than those of starboard with all the rudder angles and maneuvering indexes such as K and T were relatively bigger than other vessels. Also, the distance cf new course was measured to $125{\sim}300m$ in case of the new course on $30^{\circ}{\sim}90^{\circ}$. All of these results will be helpful to escape from collision and to alter course on coastal voyage.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• v.29 no.1
• /
• pp.77-83
• /
• 2005

In collision avoidance problem of a ship, collision risk model is usually set up using the interview results fron experts who sit on a simulator by varying parameters, in which DCPA and TCPA are commonly used. This method, however, has the weakness in that not only it is expensive but also it shows different results depending on the inerviewees and other navigational parameters. In this study, a fuzzy inference system is designed based on own ship's maneuverability verified fron simulation instead of interviewing navigators. The time and distance corresponding to the collision risk value on which avoidance maneuver should be started are set to the minimum marginal time at which own ship starts maneuvering and the minimum marginal distance suggested by marine traffic rules respectively. This system can be recorfigured as a nonlinearity-strengthened one by increasing the number of fuzzy membership functions.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.27 no.1
• /
• pp.26-33
• /
• 2019

It is necessary to establish a UAV pilot license and training system because the number of UAV-related accidents has rapidly risen. Most of accidents are caused by the human factors such as the lack of control skill and aviation knowledge. In this paper, we investigate licensing policy of small UAV pilots and examine the level of UAV licensing system and classification criteria based on comparative analysis of national cases such as USA, UK and China. Recently, the Ministry of Land, Infrastructure and Transport Affairs is planning to improve the safety regulation by taking into account the risk level of the licensing system, which has been classified according to the existing weight and commercial purpose. From the comparative analysis, we suggested a improvement policy for UAV licensing system in the view of pilot license segmentation, beyond Visual Line-of-sight flight and high risk UAV for non-commercial.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.25-25
• /
• 2004

이 논문에서 다루는 주제는 수동 기구부에 의해 자동으로 지면 적응이 가능한 이중 트랙 구조를 가진 ROBHAZ-DT3에 대한 설계 및 구성이다. 이 로봇은 기본적으로 군사용과 민간용으로 동시에 사용 가능하게 설계되어 있다. 이 로봇에 사용된 이중 트랙 구조는 앞쪽과 뒤쪽 트랙 사이에 수동적인 회전 조인트를 설치한 것으로 이 구조에 의해서 로봇의 트랙은 주행을 하면서 지면에 중력방향으로 순응하면서 형상이 변형되어 계단과 같은 험한 비평탄 지형에서도 높은 지형적응력을 보여주어 주행성능을 높여준다.(중략)

• Defense and Technology
• /
• no.5 s.159
• /
• pp.46-51
• /
• 1992

비행훈련용 시뮬레이터는 고난이도의 전투기 조종훈련에서 치명적일수 있는 위험도를 현격히 낮출수 있다는 점 하나만으로도 국방에서 매우 큰 가치를 지니고 있으며, 효율적이고 경제적인 조종사의 양성을 통한 훈련 및 교육 경비의 절감에 매우 효과적이다. 특히 최근 들어 비행훈련용 시뮬레이터를 비롯한 각종 시뮬레이터들은 국방예산 삭감의 세계적인 추세속에서 군의 정예화와 전술훈련을 통한 전쟁수행능력 확보를 위해 훌륭한 역할을 담당하고 있다

• Journal of Navigation and Port Research
• /
• v.32 no.1
• /
• pp.103-108
• /
• 2008

In the maritime universities, cadets of deck part should practice on board training using training ships of university or merchant vessels of company for 1 year according to STCW Convention. For training period, trainees are educated many education items as to positioning ability, chart work ability, vessel operation ability and cargo operation ability etc. Among many abilities, vessel avoiding ability which is demanded as a basic ability for deck officer can't be gained easily, because avoiding maneuver of ship controlled by cadets is not allowable regally and encounter situations occur randomly. This paper investigated CPA to the various encounter types with other vessels during the ocean going navigation of T.S Hannara. We analysis danger degree per each encounter type, and proposed a basic material of efficient training education about proper look-out and avoiding maneuver.

• ICROS
• /
• v.10 no.4
• /
• pp.35-42
• /
• 2004

일반적으로 21세기에는 로봇이 기존의 인간이 가지고 있던 작업영역을 대처 할 거라고 말해지고 있으며 가까운 미래에 재난 현장, 인명구조, 지뢰제거, 정찰과 같은 위험작업 영역에 대해서 먼저 기존 인력을 대처할 수 있는 이러한 로봇의 필요성이 두각 되고 있다. 그러나 이러한 위험 작업 현장에서 운영이 가능한 로봇이 만들어지기 위해서는 일차적으로 일반적인 위험작업 지역인 계단과 같은 비 평탄 지형에 대한 이동 성능을 보장할 수 있는 로봇 이동 기술의 개발이 필요하다 일반적으로 이동형 로봇은 Wheel Type, Track Type 그리고 Walking Type으로 구분이 된다. 하지만 비평탄 지역에서 Wheel Type은 Track Type에 비해서 상대적인 주행성능이 떨어진다고 일반적으로 말해지고 있으며 또한 Walking Type은 제어방식이 복잡하고 제어부의 크기가 커서 앞의 두 방식에 비해 절대적으로 이동속도가 느리다는 단점을 가지고 있다. (중략)

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.813-816
• /
• 2017

미지의 환경에 대한 지도는 다양한 분야에서 중요한 자료로 활용될 수 있다. 본 논문에서는 사람이 접근할 수 없는 위험지역을 탐색하고, 이에 대한 지도를 제작하는 Mappingbot을 구현하였다. 로봇은 SLAM기술을 활용하여 실시간 지도를 제작하고, 해당 지도 내에서 자신의 위치를 추정한다. 또한, 별도의 조종 없이 위험 지역을 전방위 탐사한다. 이는 위험지역 및 재난지역뿐만 아니라, GPS를 통한 위치정보를 받을 수 없는 환경에서 활용할 수 있다는 점에서 구현의 의의를 갖는다.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.13 no.2 s.29
• /
• pp.147-153
• /
• 2007

In this paper, the authors calculated maneuvering motions of a large container vessel approaching to the newly built container piers to get alongside to her berth in Busan harbour. The motion calculations were done by using fixed coordinate system and the object of the calculations is to check the maneuvering motions are safe or not for berthing the large vessel to her berth. The result of calculations manifested that a large container vessel can get alongside to the piers without any difficulty under normal weather conditions by using 2 Z. Peller tug boats of 4500 H.P. each and also these demonstrated it is difficult to conduct and get her alongside to the piers under rough weather conditions of wind force 16.9m/sec or more. Under rough weather conditions of 6 by Beaufort scale the average wind velocity is about 13.5m and if we add 25% increase of the normal velocity to it, the wind will becomes a gust of 16.9m/sec. So it is advisable to avoid conducting a large container vessel to the pier under the rough weather conditions of 6 or more by Beaufort scale. Also, it is better to use 3 Z. peller tug boats of 4500 H.P. each under the above mentioned rough weather in a case of unavoidable circumstances.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.33 no.4
• /
• pp.1683-1691
• /
• 2013

Concrete surface grinding is frequently used for flatness of concrete surface, concrete pavement rehabilitation, and adhesiveness in pavement construction. The procedure is, however, labor intensive and has a hazardous work condition. Also, the productivity and the quality of concrete surface grinding highly depend on the skills of worker. Thus, the development of remote controlled concrete surface grinding equipment is necessary to prevent the environmental pollution and to protect the workers from hazardous work condition. However, it is difficult to evaluate the grinded surface objectively in a remote controlled system. Also, The machine vision system developed in this study takes the images of grinded surface with the network camera for image processing. Then, by representing the quality test results to the integrated program of the remote control station, the quality control system is constructed. The machine vision algorithm means the image processing algorithm of grinded concrete surface and this paper presents the objective quality control standard of grinded concrete surface through the application of the suggested algorithm.