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유창선,최형식,박범진,안성준,강영신,Yoo, Chang-Sun,Choi, Hyung-Sik,Park, Bum-Jin,Ahn, Sung-Jun,Kang, Young-Shin 제어로봇시스템학회 2005 제어·로봇·시스템학회 논문지 Vol.11 No.3
VTOL(Vertical Take-Off and Landing) aircraft is attractive due to the reason that it is not necessary to have long runway. However a rotorcraft has a definite limitation to fly at the high speed due to the stall at the tip of rotor. To solve this problem, tilt rotor, tilt wing and lift fan were researched and developed. It was verified that the tilt rotor aircraft among them was more effective in disk loading. On this basis, the tilt rotor aircraft has been made into XV-15, V-22, BA-609 and Eagle Eye. This paper shows a nonlinear simulation program for general tilt rotor aircraft that was developed in order to validate the flight characteristics of tilt rotor aircraft and verified through the simulation analysis.
틸트로터 무인기 함상이착륙 위한 파고운동 해석 및 시뮬레이션
유창선(Chang-Sun Yoo),조암(Am-Cho),박범진(Bum-Jin Park),강영신(Young-Shin Kang) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.9
오늘날 무인기는 기술 발전을 통해 육해상의 다양한 분야에서 이용되고 있다. 한국항공우주연구원(KARI)에서는 육상용 수직이착륙기로 개발된 틸트로터 무인기를 해상에서 운용할 수 있도록 임무영역 확장을 고려하고 있다. 틸트로터 무인기의 효과적인 해상운용을 위해서는 함상이착륙이 필요하지만 해상은 지상에 비해 염분, 연무, 바람등 기상영향을 많이 받는다. 또한 지상과는 달리 선박 운동으로 인한 착륙지점의 운동이 발생하며, 자동 함상착륙을 어렵게 만든다. 이러한 무인기 함상이착륙을 위하여 본 논문에서는 파고에 따른 선박 운동을 모델링 하고, 무인기 시뮬레이터를 통해 시험평가한 결과를 제시하고 있다. The mission of UAV has been expanded from a land to an ocean based on an enhancement of its technologies. Korea Aerospace Research Institute (KARI) also tries to expand the mission of tilt rotor UAV to an ocean, in which the shipboard landing of UAV is required. However the environment of an oceanic operation is severer than that of land due to salty, fogy, and windy condition. The landing point for automatic landing is not fixed due to movement of shipboard in roll, pitch, and heave. It makes the oceanic operation and landing of UAV difficult. In order to conduct an oceanic operation of tilt rotor UAV, this paper presents that the sea wave modeling according to the sea state is conducted and the shipboard landing of tilt rotor UAV under the sea wave is tested and evaluated through the flight simulator for UAV.
유창선(Chang-Sun Yoo),조암(Am Cho),박범진(Bun-Jin Park),강영신(Young-Shin Kang) 한국항공우주연구원 2013 항공우주기술 Vol.12 No.1
오늘날 헬리콥터 기술의 발전과 더불어 함상에서 헬리콥터를 운용하는 것은 당연한 것으로 여겨지고 있다. 육상과 달리 해상에서 항공기를 운용하기 위해서는 육상보다 심한 바람과 파도와 배의 이동에 의한 착륙장의 운동과 염분에 의한 장비의 부식이 고려되어야 하며 안전한 운용을 위한 운용절차가 요구된다. 본 논문에서는 수직이착륙 항공기의 함상 운용 사례분석을 통하여 함상운용에 요구되는 항공기와 선박의 고려사항과 운용절차를 알아보고 이를 기반으로 틸트로터 무인기의 함상운용 기술개발 방안을 제시한다. As helicopter technology has been upgraded, today its oceanic operation is considered to be usual. In oceanic operation of helicopter, the effect of severe wind, wave, and corrosion must be investigated and the operation procedures for safety as well as the motion of shipboard arising from maneuvers of ship must also be considered. In this paper, it describes the result of trade-off study for shipboard landing and its operation procedure including dynamic interface between ship and aircraft in ship operation and gives a simulation results to implement the oceanic operation of tilt rotor aircraft.
유창선 ( Chang Sun Yoo ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2012 大韓皮膚科學會誌 Vol.50 No.2
Background: Keloids and hypertrophic scars may complicate wound healing secondary to trauma or surgery. They are benign growths of dermal collagen that usually cause major physical, psychological, and cosmetic problems for patients. Objective: The purpose of this study was to evaluate the efficacy of using a 5-FU (Fluorouracil)/Triamcinolone acetonide (TCN) mixture to treat keloids and hypertrophic scars. Further, the results were compared via TCN alone. Methods: Patient chart from 2007 to 2011 were reviewed. Patients were stratified into 2 groups: (1) intralesional injection of TCN 0.1 ml (40 mg/ml) mixed with 5-FU 0.9 ml (50 mg/ml), every 2 weeks; (2) intralesional injection of TCN (20 mg/ml), every 2 weeks. Lesions were assessed for height, erythema, pliability, pruritus, pain/tenderness, patient-self assessment and side effects at baseline (initiation of treatment) and at weeks 2, 4, 6. Results: There has been 23 patients (43 lesions) that completed the study. At the 2, 4, 6 week visits, both groups showed an acceptable improvement in all nearly parameter., However, in comparison between the groups, there was no statistically significant differences (p>0.05). Complications such as injection pain and hyperpigmentation were seen in both treatment groups. Conclusion: The overall efficacy of 5-FU/TCN mixture was comparable with TCN alone. (Korean J Dermatol 2012;50(2):123~129)