• Journal of Korea Society of Industrial Information Systems
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• v.28 no.1
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• pp.17-25
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• 2023

As the range of use of urban unmanned aerial vehicles (UAV) expands, it is necessary to operate UAVs efficiently because of its limited battery capacity. For this, it is required to find the optimal flight profile with various simulations. Therefore, it is important to predict the power and energy consumption of the UAV battery. In this paper, we analyzed the relationship between the speed and acceleration of the UAV and power consumption during the flight. Then, we derived a linear model, which is easily utilized. In addition, we also derived an accurate power consumption model based on deep neural network learning. To find the efficient model, we used learning data as 1) the GPS 3-axis velocity and acceleration data, 2) the IMU 3-axis velocity only, and 3) the IMU 3-axis velocity and acceleration data. The final model shows 5.86% error rate for power consumption and 1.50% error rate for the cumulative energy consumption.

• The Optical Journal
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• s.158
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• pp.61-64
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• 2015

드론(drone)이라 불리는 무인항공기(UAV)가 무인전투기, 무인정찰기 등 군사용도를 벗어나 일상생활의 다양한 영역에서 그 쓰임새를 빠르게 찾아가고 있다. 미국 아마존과 구글, 독일 DHL, 중국 알리바바 등이 배달전용 드론을 시범 운영하고 있다. 미국 미네소타 주에 위치한 메이요(Mayo) 병원은 주변 소재 작은 병원에 수혈용 피를 운반하는데 드론을 이용하고 있다. 미국의 경우 수혈용 피 대부분이 대형 병원에 비축되어 있다. 지역의 작은 병원의 경우 1-2명의 환자를 위한 응급 피를 보관하고 있을 뿐이다. 이런 상황에서 혈액 배달 드론은 유용하게 기능할 수 있다. 그렇다고 벌떼처럼 드론이 도심을 떠다니는 일은 당분간 없을 것이다. 미국의 경우 드론사업과 관련하여 현재까지 매우 엄격한 '사전허가'가 요구된다. 그 누구도 하늘을 떠다니는 드론이 폭풍과 같은 기상 이변을 만나 자신의 머리 위로 또는 주택 위로 떨어지는 것을 원치 않기 때문이다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.5
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• pp.413-422
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• 2012

The ducted fan for a small UAV propulsion can reconnoiter and observe in a town and a small area, it has better thrust efficiency and a long endurance than propeller. Thrust characteristics of hover and for ward flight condition for the ducted fan UAV is important issue to improve a endurance. The unsteady 3-dimensional flow fields of the ducted fan UAV is essential to stable flight. In this paper, to verify the design results of the ducted fan and to investigate a stable aeronautical characteristic, the thrust performance and the unsteady 3-dimensional flow fields are measured. Thrust characteristics for the hovering and the forward flight conditions are measured by the 6-components balance system in the subsonic wind tunnel. The unsteady 3-dimensional flow fields are analyzed by using a stationary $45^{\circ}$ slanted hot-wire technique. The swirl velocity is almost removed behind the stator blades. Therefore, the thrust performance of the ducted fan is improved and the flight stability is maintained.

• Journal of Aerospace System Engineering
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• v.15 no.5
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• pp.24-32
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• 2021

Personal Air Vehicle (PAV), Cargo UAS (Cargo UAS), and existing manned and unmanned aircraft are key vehicles for urban air mobility (UAM), and should demonstrate compatibility for the design of aircraft systems. The safety assessment required by for certification to ensure safety and reliability should be systematically performed throughout the entire cycle from the beginning of the aircraft development process. However, with the increasing complexity of safety critical aviation systems and the application of state-of-the-art systems, conventional experience-based and procedural-based safety evaluation methods make ir difficult to objectively assess safety requirements and system safety. Therefore, Model-Based Safety Assessment (MBSA) using modeling and simulation techniques is actively being studied at domestic and foreign countries to address these problems. In this paper, we propose a Model-Based Safety Evaluation framework utilizing modeling and simulation-based integrated flight simulators. Our case studies on the Traffic Collision Availability System (TCAS) and Wheel Brake System (WBS) confirmed that they are practical for future safety assessments.