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Sunghun Jung
Faculty of Smart Vehicle System Engineering, Chosun University, Gwangju 61452, Korea

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Editorial
Published: 14 November 2020 in Applied Sciences
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This editorial paper was a special issue of Applied Sciences belonging to the section of mechanical engineering in MDPI journal and summarized the collected manuscripts regarding the unmanned aerial vehicles (UAVs) related technologies, including communication, control, collision avoidance, modeling, path planning, human-machine interface (HMI), artificial intelligence (AI), etc. Chronologically, this special issue was started to be coordinated at the end of Oct 2018, prepared for a month and opened to collect manuscripts from the middle of Nov 2018 until the end of Dec 2019. During almost a year, 26 papers were published online out of 50 submitted papers which results in 52% acceptance rate.

ACS Style

Sunghun Jung. Special Issue on Unmanned Aerial Vehicles (UAVs). Applied Sciences 2020, 10, 8078 .

AMA Style

Sunghun Jung. Special Issue on Unmanned Aerial Vehicles (UAVs). Applied Sciences. 2020; 10 (22):8078.

Chicago/Turabian Style

Sunghun Jung. 2020. "Special Issue on Unmanned Aerial Vehicles (UAVs)." Applied Sciences 10, no. 22: 8078.

Journal article
Published: 08 July 2020 in Applied Sciences
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In this study, a wireless power transmission (WPT) system for high power was developed to supply the wirelessly powered transfer cart for a clean environment (such as liquid crystal display (LCD), semiconductor, and flat panel display (FPD) device industries) to improve the cleanliness of related industrial production lines and save energy. The power transmission method of WPT and the core design were optimized, and a shortened track was fabricated to enable WPT via short power lines for diverse applications in a small space-constrained workshop. In realizing the shortened Litz wire system, the amount of heat generated increased due to the increased resistance in the system, and efforts were made to improve the thermal performance. A simple approach was also proposed to estimate the skin depth caused by the skin effects in a cable made up of multiple strands of multiple wires, validated through thermal analysis by using ANSYS software in terms of heat generation by an electric field. Structure designs were implemented to improve the heat transfer performance, and the experimental results of WPT systems at a power level of 21.54 kW demonstrate that the power transfer distance of WPT was above 15 mm with a charging efficiency above 83.24%.

ACS Style

Jae Sik Jin; Sunghun Jung; Han Joo Kim. Development of Wireless Power Transmission System for Transfer Cart with Shortened Track. Applied Sciences 2020, 10, 4694 .

AMA Style

Jae Sik Jin, Sunghun Jung, Han Joo Kim. Development of Wireless Power Transmission System for Transfer Cart with Shortened Track. Applied Sciences. 2020; 10 (14):4694.

Chicago/Turabian Style

Jae Sik Jin; Sunghun Jung; Han Joo Kim. 2020. "Development of Wireless Power Transmission System for Transfer Cart with Shortened Track." Applied Sciences 10, no. 14: 4694.

Journal article
Published: 24 June 2020 in Remote Sensing
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Multispectral imagery contains abundant spectral information on terrestrial and oceanic targets, and retrieval of the geophysical variables of the targets is possible when the radiometric integrity of the data is secured. Multispectral cameras typically require the registration of individual band images because their lens locations for individual bands are often displaced from each other, thereby generating images of different viewing angles. Although this type of displacement can be corrected through a geometric transformation of the image coordinates, a mismatch or misregistration between the bands still remains, owing to the image acquisition timing that differs by bands. Even a short time difference is critical for the image quality of fast-moving targets, such as water surfaces, and this type of deformation cannot be compensated for with a geometric transformation between the bands. This study proposes a novel morphological band registration technique, based on the quantile matching method, for which the correspondence between the pixels of different bands is not sought by their geometric relationship, but by the radiometric distribution constructed in the vicinity of the pixel. In this study, a Micasense Rededge-M camera was operated on an unmanned aerial vehicle and multispectral images of coastal areas were acquired at various altitudes to examine the performance of the proposed method for different spatial scales. To assess the impact of the correction on a geophysical variable, the performance of the proposed method was evaluated for the chlorophyll-a concentration estimation. The results showed that the proposed method successfully removed the noisy spatial pattern caused by misregistration while maintaining the original spatial resolution for both homogeneous scenes and an episodic scene with a red tide outbreak.

ACS Style

Wonkook Kim; Sunghun Jung; Yongseon Moon; Stephen C. Mangum. Morphological Band Registration of Multispectral Cameras for Water Quality Analysis with Unmanned Aerial Vehicle. Remote Sensing 2020, 12, 2024 .

AMA Style

Wonkook Kim, Sunghun Jung, Yongseon Moon, Stephen C. Mangum. Morphological Band Registration of Multispectral Cameras for Water Quality Analysis with Unmanned Aerial Vehicle. Remote Sensing. 2020; 12 (12):2024.

Chicago/Turabian Style

Wonkook Kim; Sunghun Jung; Yongseon Moon; Stephen C. Mangum. 2020. "Morphological Band Registration of Multispectral Cameras for Water Quality Analysis with Unmanned Aerial Vehicle." Remote Sensing 12, no. 12: 2024.

Journal article
Published: 24 April 2020 in Energies
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A hybrid power system (HPS) is developed for the photovoltaic (PV) powered and tethered multirotor unmanned aerial vehicle (UAV) based on the robot operating system (ROS) and verified using an indoor hardware-in-the-loop (HIL) test. All the processes, including a UAV flight mode change (i.e., takeoff, hovering, and landing) and power flow control (consisting of PV modules, a LiPo battery pack, and a UAV) are completely automated using a combination of Pixhawk 2.1 and the Raspberry Pi 3 Model B (RPi 3B). Once the indoor HIL test starts, (1) the UAV takes off and hovers with a preassigned 10 m altitude at a fixed point and keeps hovering until the voltage drops below 13.4 V ; (2) the UAV lands when the voltage drops below 13.4 V, and the hybrid power controller (HPC) starts to charge the LiPo battery pack using the energy from PV modules; and (3) the UAV takes off when the voltage of the battery pack becomes more than 16.8 V, and the procedure repeats from (1). A PV-powered and tethered multirotor UAV using the proposed HPS can fly more safely for a longer time, particularly in an urban area, and so it is competitive to the traditional multirotor type UAV in the sense of both the flight time and the surveillance mission performance.

ACS Style

Sunghun Jung. Development and Verification of Hybrid Power Controller Using Indoor HIL Test for the Solar UAV. Energies 2020, 13, 2110 .

AMA Style

Sunghun Jung. Development and Verification of Hybrid Power Controller Using Indoor HIL Test for the Solar UAV. Energies. 2020; 13 (8):2110.

Chicago/Turabian Style

Sunghun Jung. 2020. "Development and Verification of Hybrid Power Controller Using Indoor HIL Test for the Solar UAV." Energies 13, no. 8: 2110.

Journal article
Published: 14 August 2019 in Applied Sciences
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Increasing the flight endurance of unmanned aerial vehicles (UAVs) has received attention recently. To solve this problem, two research topics have generally appeared: Shortest-path planning (SPP) and remaining-flying-range estimation. In this work, energy-efficient path planning by considering the distance between waypoint nodes, the minimum and maximum speed of the UAV, the weight of the UAV, and the angle between two intersecting edges is proposed. The performances of energy-efficient path planning (EEPP) and generic shortest-path planning are compared using extended-Kalman-filter-based state-of-charge and state-of-power estimation. Using this path-planning tool and considering energy consumption during flight operation, two different path plans can be obtained and compared in advance so that the operator can decide which path to choose by consulting a comparison chart. According to the experimental results, the EEPP algorithm results in 0.96% of improved SOC leftover and 11.03 ( W ) of lowered SOP compared to the SPP algorithm.

ACS Style

Sunghun Jung. Development of Path Planning Tool for Unmanned System Considering Energy Consumption. Applied Sciences 2019, 9, 3341 .

AMA Style

Sunghun Jung. Development of Path Planning Tool for Unmanned System Considering Energy Consumption. Applied Sciences. 2019; 9 (16):3341.

Chicago/Turabian Style

Sunghun Jung. 2019. "Development of Path Planning Tool for Unmanned System Considering Energy Consumption." Applied Sciences 9, no. 16: 3341.

Journal article
Published: 06 April 2019 in Energies
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For a continuous surveillance mission using a swarm of multiple tethered low-altitude long-endurance (LALE) multirotor-type unmanned aerial vehicles (UAVs), we developed a 500 W class photovoltaic power management system (PPMS) which monitors voltage and current flows of photovoltaic (PV) panels, battery pack, and UAV and controls power flows to support UAV flight operation. In contract to a fixed-wing UAV, a tethered multirotor UAV can generate continuously varying closed-circuit television (CCTV) like ground map images by stitching incoming images though the operation range is limited. With an indoor flight experiment, we demonstrated the usefulness of the PPMS and proved operation integrity. According to the results, a total of six multirotor UAVs were required to continuously perform a surveillance mission for 5 h 46 min from 11:04 to 16:50.

ACS Style

Sunghun Jung; Yonghyeon Jo; Young-Joon Kim. Aerial Surveillance with Low-Altitude Long-Endurance Tethered Multirotor UAVs Using Photovoltaic Power Management System. Energies 2019, 12, 1323 .

AMA Style

Sunghun Jung, Yonghyeon Jo, Young-Joon Kim. Aerial Surveillance with Low-Altitude Long-Endurance Tethered Multirotor UAVs Using Photovoltaic Power Management System. Energies. 2019; 12 (7):1323.

Chicago/Turabian Style

Sunghun Jung; Yonghyeon Jo; Young-Joon Kim. 2019. "Aerial Surveillance with Low-Altitude Long-Endurance Tethered Multirotor UAVs Using Photovoltaic Power Management System." Energies 12, no. 7: 1323.

Journal article
Published: 27 March 2019 in Applied Sciences
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This paper describes the degradation of launch performance caused by the remnants of a missile canister cover with a sabot interface, on interference with adjacent structures. First, by including the material plastic behavior and element deletion, we predict interference between the structures and the detached part, followed by excessive deformation. Second, we verify that the support ring deformation, which is induced by an interaction with the cover remains, increases for fastener separations with abnormal fastener installations. This increase further triggers interference with the boosters on the bottom of a missile. Lastly, we analyze the variation of material property in a high-speed environment.

ACS Style

Wonhong Choi; Sunghun Jung. Launch Performance Degradation of the Rupture-Type Missile Canister. Applied Sciences 2019, 9, 1290 .

AMA Style

Wonhong Choi, Sunghun Jung. Launch Performance Degradation of the Rupture-Type Missile Canister. Applied Sciences. 2019; 9 (7):1290.

Chicago/Turabian Style

Wonhong Choi; Sunghun Jung. 2019. "Launch Performance Degradation of the Rupture-Type Missile Canister." Applied Sciences 9, no. 7: 1290.

Journal article
Published: 05 March 2019 in Energies
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To achieve the continuous surveillance capable multirotor type solar-powered unmanned aerial vehicle (UAV), we develop the photovoltaic power management system (PPMS) which manages power from photovoltaic (PV) modules and a battery pack to support the power of the UAV. To estimate the possible flight time of the UAV, we use the concept of state of charge (SOC) estimation based on the extended Kalman filter (EKF) and complementary filter (CF) and then calculate the possible flight time by using the slope of the SOC graph during hovering flight mode. According to the results, estimated flight time increases up to 54.14 min at 11:00 a.m. and decreases down to 6.70 min at 18:00 p.m.

ACS Style

Sunghun Jung; Yonghyeon Jo; Young-Joon Kim. Flight Time Estimation for Continuous Surveillance Missions Using a Multirotor UAV. Energies 2019, 12, 867 .

AMA Style

Sunghun Jung, Yonghyeon Jo, Young-Joon Kim. Flight Time Estimation for Continuous Surveillance Missions Using a Multirotor UAV. Energies. 2019; 12 (5):867.

Chicago/Turabian Style

Sunghun Jung; Yonghyeon Jo; Young-Joon Kim. 2019. "Flight Time Estimation for Continuous Surveillance Missions Using a Multirotor UAV." Energies 12, no. 5: 867.

Journal article
Published: 31 December 2017 in International Journal of Aeronautical and Space Sciences
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ACS Style

Sunghun Jung; Kartik B. Ariyur. Robustness for Scalable Autonomous UAV Operations. International Journal of Aeronautical and Space Sciences 2017, 18, 767 -779.

AMA Style

Sunghun Jung, Kartik B. Ariyur. Robustness for Scalable Autonomous UAV Operations. International Journal of Aeronautical and Space Sciences. 2017; 18 (4):767-779.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2017. "Robustness for Scalable Autonomous UAV Operations." International Journal of Aeronautical and Space Sciences 18, no. 4: 767-779.

Journal article
Published: 30 September 2017 in International Journal of Aeronautical and Space Sciences
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ACS Style

Sunghun Jung; Kartik B. Ariyur. Automated Wireless Recharging for Small UAVs. International Journal of Aeronautical and Space Sciences 2017, 18, 588 -600.

AMA Style

Sunghun Jung, Kartik B. Ariyur. Automated Wireless Recharging for Small UAVs. International Journal of Aeronautical and Space Sciences. 2017; 18 (3):588-600.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2017. "Automated Wireless Recharging for Small UAVs." International Journal of Aeronautical and Space Sciences 18, no. 3: 588-600.

Article
Published: 28 September 2017 in Journal of Mechanical Science and Technology
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We improve the performance of a low-quality GPS data on a UGV through use of multiple low-quality GPS modules on a UGV within line of sight of the UAV. The UGV sends GPS data corrections to the UAV on the basis of the distance from the UAV to the UGV as measured by scaling of a standard image pattern stuck on the UGV. Geolocation of both UGV and UAV are performed through the use of the extended Kalman filter integrating GPS aided INS. The positioning error is reduced by a factor of 2.3 in simulation studies and a factor of 1.6 in experiment when 3 GPS sensors are used on the UGV. This is better than what one can get through pure averaging of the GPS sensors in the presence of noise in measuring the UAV-UGV distance. We show how our exploitation of geometry improves GPS sensor performance as more GPS sensors are used.

ACS Style

Sunghun Jung; Kartik B. Ariyur. Compensating UAV GPS data accuracy through use of relative positioning and GPS data of UGV. Journal of Mechanical Science and Technology 2017, 31, 4471 -4480.

AMA Style

Sunghun Jung, Kartik B. Ariyur. Compensating UAV GPS data accuracy through use of relative positioning and GPS data of UGV. Journal of Mechanical Science and Technology. 2017; 31 (9):4471-4480.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2017. "Compensating UAV GPS data accuracy through use of relative positioning and GPS data of UGV." Journal of Mechanical Science and Technology 31, no. 9: 4471-4480.

Journal article
Published: 21 August 2017 in Energies
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Customer requirements for unmanned aerial vehicles (UAVs) with long flight times are increasing exponentially in the personal, commercial, and military use areas. Due to their limited payload, large numbers of on-board battery packs cannot be used and this is the main reason behind the need for battery management software (BMS) packages with state of charge (SOC) estimation functions to increase the flight time. At the same time, as the UAV application range has extended widely, the size of UAVs has increased and heavy-duty UAVs are slowly appearing. As a result, the system operating power of the UAVs has been increased tremendously and their safe system power operation has become an issue. This is the main reason for the need of BMS having state of power (SOP) estimation functions. In this work a 6 S Li-Po battery pack is simulated with two ladder equivalent circuit models (ECMs) considering an impedance effect whose parameters are found using hybrid pulse power characterization (HPPC) current patterns with parameter determination using the table-based linear interpolation (TBLI) method. Two state estimation methods, including the current integration method and the extended Kalman filter (EKF) method are developed and the estimation accuracies of SOC and SOP are compared. Results show that the most accurate SOC estimation turns out to be 0.1477% (indoor test with HPPC), 0.1324% (outdoor test with 0 kg payload), and 0.2021% (outdoor test with 10 kg payload). Also, the most accurate SOP estimation error turns out to be 1.2% (indoor test with HPPC), 3.6% (outdoor test with 0 kg payload), and 4.2% (outdoor test with 10 kg payload).

ACS Style

Sunghun Jung; Heon Jeong. Extended Kalman Filter-Based State of Charge and State of Power Estimation Algorithm for Unmanned Aerial Vehicle Li-Po Battery Packs. Energies 2017, 10, 1237 .

AMA Style

Sunghun Jung, Heon Jeong. Extended Kalman Filter-Based State of Charge and State of Power Estimation Algorithm for Unmanned Aerial Vehicle Li-Po Battery Packs. Energies. 2017; 10 (8):1237.

Chicago/Turabian Style

Sunghun Jung; Heon Jeong. 2017. "Extended Kalman Filter-Based State of Charge and State of Power Estimation Algorithm for Unmanned Aerial Vehicle Li-Po Battery Packs." Energies 10, no. 8: 1237.

Journal article
Published: 30 June 2017 in International Journal of Aeronautical and Space Sciences
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ACS Style

Sunghun Jung; Kartik B. Ariyur. Strategic Cattle Roundup using Multiple Quadrotor UAVs. International Journal of Aeronautical and Space Sciences 2017, 18, 315 -326.

AMA Style

Sunghun Jung, Kartik B. Ariyur. Strategic Cattle Roundup using Multiple Quadrotor UAVs. International Journal of Aeronautical and Space Sciences. 2017; 18 (2):315-326.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2017. "Strategic Cattle Roundup using Multiple Quadrotor UAVs." International Journal of Aeronautical and Space Sciences 18, no. 2: 315-326.

Journal article
Published: 01 November 2013 in Journal of Aerospace Information Systems
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ACS Style

Sunghun Jung; Kartik B. Ariyur. Enabling Operational Autonomy for Unmanned Aerial Vehicles with Scalability. Journal of Aerospace Information Systems 2013, 10, 517 -529.

AMA Style

Sunghun Jung, Kartik B. Ariyur. Enabling Operational Autonomy for Unmanned Aerial Vehicles with Scalability. Journal of Aerospace Information Systems. 2013; 10 (11):517-529.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2013. "Enabling Operational Autonomy for Unmanned Aerial Vehicles with Scalability." Journal of Aerospace Information Systems 10, no. 11: 517-529.

Conference paper
Published: 15 August 2013 in AIAA [email protected] ([email protected]) Conference
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ACS Style

Sunghun Jung; Kartik B. Ariyur. Enabling Operational Autonomy for UAVs with Robustness. AIAA [email protected] ([email protected]) Conference 2013, 1 .

AMA Style

Sunghun Jung, Kartik B. Ariyur. Enabling Operational Autonomy for UAVs with Robustness. AIAA [email protected] ([email protected]) Conference. 2013; ():1.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2013. "Enabling Operational Autonomy for UAVs with Robustness." AIAA [email protected] ([email protected]) Conference , no. : 1.

Conference paper
Published: 15 August 2013 in AIAA [email protected] ([email protected]) Conference
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ACS Style

Sunghun Jung; Cheng Liu; Kartik B. Ariyur. Absolute Orientation for a UAV using Celestial Objects. AIAA [email protected] ([email protected]) Conference 2013, 1 .

AMA Style

Sunghun Jung, Cheng Liu, Kartik B. Ariyur. Absolute Orientation for a UAV using Celestial Objects. AIAA [email protected] ([email protected]) Conference. 2013; ():1.

Chicago/Turabian Style

Sunghun Jung; Cheng Liu; Kartik B. Ariyur. 2013. "Absolute Orientation for a UAV using Celestial Objects." AIAA [email protected] ([email protected]) Conference , no. : 1.

Proceedings article
Published: 22 October 2012 in SAE Technical Paper Series
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ACS Style

Sunghun Jung; Taesup Lee; Tamzidul Mina; Kartik B. Ariyur. Inductive or Magnetic Recharging for Small UAVs. SAE Technical Paper Series 2012, 1 .

AMA Style

Sunghun Jung, Taesup Lee, Tamzidul Mina, Kartik B. Ariyur. Inductive or Magnetic Recharging for Small UAVs. SAE Technical Paper Series. 2012; ():1.

Chicago/Turabian Style

Sunghun Jung; Taesup Lee; Tamzidul Mina; Kartik B. Ariyur. 2012. "Inductive or Magnetic Recharging for Small UAVs." SAE Technical Paper Series , no. : 1.

Conference paper
Published: 01 April 2011 in 2011 IEEE International Systems Conference
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Unmanned aerial vehicles (UAVs) need multiple operators as of today. Because of limitations of human attention and sensory cueing the operators cannot use all of the data coming in through these sensors. Large scale autonomy would mean the following: fewer operators, larger areas of coverage, and more vehicles. Rigorous optimization of decision theory based approaches to handling this problem suffer from speed limits to real-time computations. Soft-computing methods based on heuristics (AI, reasoning, neural networks and fuzzy logic) are able to handle certain circumstances but cannot supply any guarantees of performance in unstructured environments. We provide solutions based on rigorous approaches, but avoid heavy real-time computation through off line processing. For mapped regions, we convert maps into traversability graphs using trapezoidal map/voronoi type algorithms. We then find the shortest permissible paths for different vehicles using Dijkstra's algorithm and then preening the allowable paths using constraints on individual vehicles. Out third step consists in determining the minimum time taken by a given vehicle over those paths. We insert margins of safety at each level of this hierarchy: buffer zones (size of buffer zone is a ten meters extended polygon around each building) around mapped structures to account for map errors; buffer zones around flight paths to account for position uncertainty of vehicles; performing 1-D optimal control within limits of the vehicles performance so that vehicles can slow down or speed up in response to unexpected events.

ACS Style

Sunghun Jung; Kartik B. Ariyur. Robustness for large scale UAV autonomous operations. 2011 IEEE International Systems Conference 2011, 309 -314.

AMA Style

Sunghun Jung, Kartik B. Ariyur. Robustness for large scale UAV autonomous operations. 2011 IEEE International Systems Conference. 2011; ():309-314.

Chicago/Turabian Style

Sunghun Jung; Kartik B. Ariyur. 2011. "Robustness for large scale UAV autonomous operations." 2011 IEEE International Systems Conference , no. : 309-314.

Conference paper
Published: 29 March 2011 in [email protected] 2011
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ACS Style

Sunghun Jung; Kartik Ariyur. Scalable Autonomy for UAVs. [email protected] 2011 2011, 1 .

AMA Style

Sunghun Jung, Kartik Ariyur. Scalable Autonomy for UAVs. [email protected] 2011. 2011; ():1.

Chicago/Turabian Style

Sunghun Jung; Kartik Ariyur. 2011. "Scalable Autonomy for UAVs." [email protected] 2011 , no. : 1.