• 한국항공운항학회지
• /
• 제25권4호
• /
• pp.83-90
• /
• 2017

Unmanned Aerial Vehicles(UAVs) require collision avoidance capabilities equivalent to the capabilities of manned aircraft to enter the airspace of manned aircraft. In the case of Visual Flight Rules of manned aircraft, collision avoidance is performed by 'See-and-Avoid' of pilots. To obtain those capabilities of UAVs named as 'Sense-and-Avoid', sensor-system-based intruder tracking and collision avoidance methods are required. In this study, a multi-sensor-based tracking, data fusion, and collision avoidance algorithm is designed by using a model-based design tool MATLAB/SIMULINK, and validations of the designed model and code using numerical simulations and processor-in-the-loop simulations are performed.

• 한국항공운항학회:학술대회논문집
• /
• 한국항공운항학회 2016년도 춘계학술대회
• /
• pp.30-34
• /
• 2016

TR-60 틸트로터 무인기는 전장 3m, 최대이륙중량 200kg로서 2013년 2월 자동천이비행에 성공한 비행체로서 현재 해상운용을 위한 함상이착륙기술을 개발 중에 있다. 무인기 해상운용은 육상보다 심한 염무와 바람과 선박의 운동에 의한 착륙대의 이동 등의 열악한 환경에서 이루어져야 한다. 이동이 있는 착륙대와 착륙장 주변의 장애물을 고려하면 정확한 착륙을 위한 정밀한 항법유도가 요구된다. TR-60의 정밀항법유도를 위해서 수cm 단위의 정확도를 갖는 RTK GPS 기반의 정밀상대항법과 이동 착륙장 대한 자동착륙유도를 설계하고 구현함으로 함상자동 이착륙 기술을 개발하였다. 본 논문에서는 RTK GPS 기반의 정밀상대항법과 자동착륙유도에 대한 연구와 함상접근착륙절차에 따른 자동착륙정확도 측정 비행시험 결과를 기술하였다.

• 산업기술연구
• /
• 제31권B호
• /
• pp.91-98
• /
• 2011

In this thesis, from the results of settlement measurement performed at the site where embankment earthwork was carried out on the ground consisting of highly plastic and silty soft soils interlayered with organic deposits, various methods of predicting the embankment settlement such as Hoshino's method, Asaoka's method, hyperbolic method, ${\sqrt{s}}$ method and Monden's method were used to investigate their applicability and the inverse method of finding the soil parameter related to consolidation was used to predict the consolidation behavior in the future. It was confirmed that reliable prediction of consolidation behavior under various conditions could be done to estimate soil parameter related to consolidation such as the consolidation index and consolidation coefficient by the inverse method of comparing the measured settlement with the predicted value by the settlement prediction methods.

• 제어로봇시스템학회논문지
• /
• 제11권3호
• /
• pp.193-199
• /
• 2005

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.

• 제어로봇시스템학회논문지
• /
• 제14권12호
• /
• pp.1226-1231
• /
• 2008

A design of attitude controller for a tiltrotor is presented augmenting L1 adaptive control, neural networks, and feedback linearization. The neural networks compensate for the modeling error caused by the lack of knowledge of tiltrotor dynamics while the L1 adaptive control allows high adaptation gains in adaptation laws thereby, satisfying tracking performance requirement. The efficacy of this control methodology is illustrated in high-fidelity nonlinear simulation of a tiltrotor by flying the tiltrotor in different flight modes from where the L1 adaptive controller with neural networks is originally designed for.

• 항공우주시스템공학회지
• /
• 제2권3호
• /
• pp.1-6
• /
• 2008

The tilt rotor aircraft has the flight characteristics which takes off vertically like a helicopter and flies forward like an airplane. Especially, the transition process from a helicopter to an airplane mode requires not only the mixing of control inputs but also the stability and controllability augmentation system(SCAS) in order to keep the safe flight because there are compound flight dynamic characteristics of a helicopter and an airplane including non-linearity, uncertainty. This paper describes the design of SCAS in a lateral motion for the tilt rotor aircraft based on the $H_{\infty}$ control method, which was performed from mathematical model with weighting matrix based on the relationship between the $H_{\infty}$ norm and the sensitivity function. Through simulation analysis for the controller designed on the $H_{\infty}$ control theory, it was shown that this method may be applied to the control design of the tilt rotor aircraft.

• The Journal of Korean Physical Therapy
• /
• 제25권4호
• /
• pp.167-173
• /
• 2013

Purpose: To obtain the isokinetic normative data of isokinetic laboratory of department of Rehabilitation Medicine in the normal subjects for those twenties of Korea. Methods: A total of 228 volunteers participated in this study and isokinetic evaluation of knee extensors and flexors at speed $60^{\circ}/sec$ BIODEX System 3 Isokinetic Dynamometer was performed in 128 males and 100 females. Results: In the normal subjects for those twenties, Normative data were presented. Absolute muscle strength of knee-extensors and knee-flexors, Relative muscle strength, bilateral muscle strength deficit, and flexor/extensor strength ratio were presented. Conclusion: Those results expect that it will be available for patients with 20's knee diseases to apply as the basic materials for the muscle function improvement of knee extensors and flexors.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.194-194
• /
• 2000

In aviation navigation by GPS, requirements on availability and integrity must be absolutely satisfied for safety. Current study on accomplishing this integrity includes RAM(Receiver Autonomous Integrity Monitoring), checking integrity internally in GPS receiver itself. However RAIM techniques have be investigated and presented under assumption that there is included only one fault in measurements from GPS, In case of multiple fault, an interaction among bias errors sometimes results in decreasing the effect of multiple fault. This may make an exact fault detection and identification difficult, and study on mutiple fault RAIM focused on. This paper explains the reasons that techniques applied on single fault are not adequate to extend directly to two faults case and shows that RAIM solution on two fault may be given in revised parity space.

• 대한물리치료과학회지
• /
• 제18권4호
• /
• pp.1-10
• /
• 2011

The purpose of study suggest that new strategies available for the physical therapy curriculum development are trying to elicit from world-renowned universities those to keep pace with the globalization. The curriculum of 3 universities in Australia was compared with those of a four-year course in Korea. The 3 university are Sydney, Melbourne and Queensland Universities in Australia. Overall, the curriculum in Korea not only showed overlapping subjects, a shortage of clinical time and foundation science but, didn't deal with many subject to satisfy international recommendation. We suggest that a new curriculum should be based on the three parts which are foundation, essential divided into 6 areas and selection subject, particularly extended clinical experience to essentially need to be physical therapy in the world-standard.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2001년도 춘계학술대회 발표논문집
• /
• pp.95-98
• /
• 2001

최근 몇 년 사이 컴퓨터에 관련된 많은 발전과 함께 모의실험을 위한 소프트웨어 및 모의훈련장치(시뮬레이터)가 다양한 분야에서 연구 개발 보급되고 있다. 그중 컴퓨터와 소프트웨어의 급격한 발달로 그래픽과 멀티미디어를 통합한 가상현실구현에 많은 개발과 연구가 진행되고 있고 네트웍의 발전으로 여러 사람이 쉽게 접할 수 있는 가상공간이 점차 확대되고 있다. 컴퓨터와 소프트웨어의 가상공간은 시각적인 가상공간인 반면, 실제 많은 비용과 장비가 수반되는 시뮬레이터는 인간이 쉽게 체험하지 못하는 환경 적응을 위한 훈련 체험 장비로 위험과 안전성 예기치 못한 돌발상황 등으로 발생할 수 있는 많은 인적 물적 재산의 피해를 예방하기 위한 훈련장치로 다양한 분야에서 활용되고 있다. 본 논문에서는 훈련 및 레져 오락용으로 다양하게 연구 개발되는 시뮬레이터에서 중대형 고가의 현 구동방식을 중저가 소형의 2축 Motion Base 구동방식을 제안하고 개발된 시제품에 대한 시스템 구성과 동작특성을 기술하였다.