• Title, Summary, Keyword: 비행경로

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Optimal Path Planning for UAVs under Multiple Ground Threats (다수 위협에 대한 무인항공기 최적 경로 계획)

  • Kim, Bu-Seong;Bang, Hyo-Chung;Yu, Chang-Gyeong;Jeong, Eul-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.1
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    • pp.74-80
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    • 2006
  • This paper addresses the trajectory optimization of Unmanned Aerial Vehicles(UAVs) under multiple ground threats like enemy's anti-air radar sites. The power of radar signal reflected by the vehicle and the flight time are considered in the performance cost to be minimized. The bank angle is regarded as control input for a 1st-order lag vehicle, and input parameter optimization method based on Sequential Quadratic Programming (SQP) is used for trajectory optimization. The proposed path planning method provides more practical trajectories with enhanced survivability than those of Voronoi diagram method.

Homing Guidance Law of Anti-Ship Missiles Using Flight Path Angle (비행 경로각을 이용한 대함 유도탄의 호밍 유도법칙)

  • Jin, Sheng-Hao;Yang, Bin;Hwang, Chung-Won;Park, Seung-Yub;Park, Seung-Je
    • The Journal of Advanced Navigation Technology
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    • v.14 no.5
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    • pp.596-603
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    • 2010
  • This paper presents a homing guidance law of anti-ship missiles using flight path angle to achieve an impact time constraint as well as an impact angle constraint. the independent variable in the nonlinear engagement model is change d from the flight time to the heading angle of the missile. The proposed guidance law can home a missile to the target with zero miss distance as well as satisfying both of the impact angle and time constraints. The performance of the proposed guidance law is evaluated by the computer simulations.

Developmental Pathways from Child Abuse to Delinquency (피학대아동이 비행에 이르는 발달경로)

  • Chung, Ick-Joong;Park, Hyun-Sun;Ku, In-Hoe
    • Korean Journal of Social Welfare
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    • v.58 no.3
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    • pp.223-244
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    • 2006
  • The purpose of this study was to investigate the developmental pathways that mediate the effects of child abuse on delinquency. Data from the first wave of 'Seoul Panel Study of Children(SPSC)' were analyzed. The subjects consisted of 1,811 4th grade students from elementary schools. Structural equation model was employed for statistical analyses. The results showed that the relationship between child abuse and delinquency was indirectly mediated by self-esteem, peer rejection, and school attachment. The hypothesized structural model had a good model fit. Abused children were more likely to have low self-esteem, which was associated with higher levels of delinquency. In addition, abused children were more likely to be rejected by peers and to have low school attachment, which was also associated with higher levels of delinquency. Implications for social work practice from this study were discussed.

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Design a Path Following Line-of-Sight Guidance Law based on Vehicle Kinematics (비행체 운동 역학 기반 경로 추종 시선각 유도 법칙 설계)

  • You, Dong-Il;Shim, Hyun-Chul
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.6
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    • pp.506-514
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    • 2012
  • This paper represents a method for designing of path following Line-of-Sight(LOS) guidance law based on vehicle kinematics. In general, a LOS guidance law which is composed of gains and approach length as design parameters is designed by empirical or trial-and-error method. These approaches cannot guarantee a precision tracking performance of guidance law consistently. Also, the design parameters should be redesigned with variations of vehicle maneuverability and flight velocity. Based on a vehicle kinematics with its velocity, the proposed method for designing of parameters not only minimizes the number of design parameters, also has a reliable and consistent tracking performance using variable guidance gain changed in accordance with flight velocity. This is validated by nonlinear simulation with $1^{st}$ order attitude response dynamics and flight experiments with given linear and circular path.

Autonomous Flight System of UAV through Global and Local Path Generation (전역 및 지역 경로 생성을 통한 무인항공기 자율비행 시스템 연구)

  • Ko, Ha-Yoon;Baek, Joong-Hwan;Choi, Hyung-Sik
    • Journal of Aerospace System Engineering
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    • v.13 no.3
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    • pp.15-22
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    • 2019
  • In this paper, a global and local flight path system for autonomous flight of the UAV is proposed. The overall system is based on the ROS robot operating system. The UAV in-built computer detects obstacles through 2-D Lidar and generates real-time local path and global path based on VFH and Modified $RRT^*$-Smart, respectively. Additionally, a movement command is issued based on the generated path on the UAV flight controller. The ground station computer receives the obstacle information and generates a 2-D SLAM map, transmits the destination point to the embedded computer, and manages the state of the UAV. The autonomous UAV flight system of the is verified through a simulator and actual flight.

Aircraft Path Planning Considering Pop-up Threats Using Framed-Quadtree Wavefront Propagation and Navigation Function (Framed-Quadtree 파면전파 기법과 항법함수 기법을 이용한 항공기 위협회피 궤적 설계)

  • Kim, Pil-Jun;Choi, Jong-Uk;Kim, You-Dan
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.10
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    • pp.918-926
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    • 2007
  • Military aircrafts usually operate at the area with lots of threats such as radars and surface-to-air missiles. Aircraft also faces with the unexpected or pop-up threats. Under this environment, a safe flight path should be generated to lead a mission successful. In this paper, a new path planning algorithm is proposed to provide less dangerous flight path efficiently. Of many path planning algorithms, a potential method is considered, because it has advantages of computation efficiency and smooth path generation. Trajectory generation under the condition of maximum range is studied so that the aircraft may reach the target area without refueling. The algorithm to cope with an unexpected situation is also proposed by adopting the concept of initial direction vector, additional force, and a new mapping function. The performance of the proposed algorithms is demonstrated for SEAD (Suppression of Enemy Air Defences) mission by numerical simulation.

Drone Flight Path for Countacting of Industry Disaster (산업 재해 대응 드론 비행경로 설정 방법)

  • Choo, Sang-Mok;Chong, Ui-Pil;Lee, Jung-Chul
    • Journal of Korean Institute of Intelligent Systems
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    • v.27 no.2
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    • pp.132-137
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    • 2017
  • Drone is currently used for wide application areas in our real life. Also it performs more important functions. We propose a method of drone operation system for the prevention of industrial disaster. In normal operation of drone system the drone monitors the industrial sites according to the planned flight path with acquiring the monitored images and send the image information to the server. The server analyzes and compares the images to DB information by calculating the similarity based on the threshold. Then the system decides whether the industrial sites has problems or not. If the abnormal condition is occurred, the drone change the flight path to abnormal flight path and keep monitoring the industrial sites with measuring the air status by sensors and sends all information to server system on the ground. If the emergency case is occurred, drone approaches the closest position of accident points and acquiring the all information and send them to server and 119 center.

Modeling and Simulation of Evolutionary Dynamic Path Planning for Unmanned Aerial Vehicles Using Repast (Repast기반 진화 알고리즘을 통한 무인 비행체의 동적 경로계획 모델링 및 시뮬레이션)

  • Kim, Yong-Ho
    • Journal of the Korea Society for Simulation
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    • v.27 no.2
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    • pp.101-114
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    • 2018
  • Several different approaches and mechanisms are introduced to solve the UAV path planning problem. In this paper, we designed and implemented an agent-based simulation software using the Repast platform and Java Genetic Algorithm Package to examine an evolutionary path planning method by implementing and testing within the Repast environment. The paper demonstrates the life-cycle of an agent-based simulation software engineering project while providing a documentation strategy that allows specifying autonomous, adaptive, and interactive software entities in a Multi-Agent System. The study demonstrates how evolutionary path planning can be introduced to improve cognitive agent capabilities within an agent-based simulation environment.

Airplane Flight Path Recording using GPS (비행기의 비행경로 기록을 위한 GPS 적용)

  • Oh, H.S.;Jung, Y.B.;Hwang, M.S.;Lee, J.M.;Kim, C.Y.;Lee, K.J.
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.2
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    • pp.47-56
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    • 1994
  • 본 연구는 GPS와 노트북 PC를 이용하여 비행경로정보를 얻기 위한 것으로, 이들을 실제 비행기에 장착하여 위치(동경, 북위, 고도), 방위, 속도등의 비행경로정보를 기록하였다. 기록된 자료를 분석한 결과 실제 비행시의 자료들과 일치함을 보였다. GPS와 노트북 PC를 이용한 비행기록장치는 조종훈련생들의 항법교육 및 항법 능력 측정 자료로 이용 될 수 있을 것이다.

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