• Journal of Convergence for Information Technology
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• v.9 no.12
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• pp.141-146
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• 2019

Economic analysis predicts that the drone market will grow, and the growth of the toy and hobby drone market is expected to gradually expand. Drone expectations are rising due to the net economic function of drone market growth, but accidents due to improper management and operations are also increasing. The difference in toy drone performance is incomparably small compared to industrial drone performance, but the ordinary buyer can not know whether the difference can cause an accident during use. The toy drones used in this study were obtained from KC and CE certification, and 20 kinds of drones were used. The flight time ranged from a minimum of 3 minutes to a maximum of 12 minutes, and the control distance ranged from a minimum of 20m to a maximum of 380m. Therefore, it is necessary to secure product safety through sampling inspection of the radio wave output of toy drones, and it is also necessary to mount an algorithm that automatically lowers the altitude or hover when exceeding the limit flight distance. For future research, we will build data to establish toy drone safety standards through a altitude testing and impact testing of toy drone.

• Journal of Advanced Navigation Technology
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• v.28 no.1
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• pp.95-101
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• 2024

This paper aims to establish a reconfigurable flight simulation environment to conduct safety evaluation of various electric vertical take-off and landing (eVTOL) aircraft. Since the inceptor, aircraft dynamics model, and controller applied to each eVTOL aircraft are different, it was configured to be variable so that a simulation can be executed for each eVTOL aircraft. Test elements and performance indicators were set to perform safety evaluation of eVTOL aircraft. Ground auxiliary equipments were designed and implemented in a simulation environment according to test procedures for each test element. In addition, to analyze safety performance, a simulation flight data collection environment based on MATLAB/Simulink and a tool for safety performance analysis were implemented. Test flight and analysis were conducted in the implemented simulation environment in this paper. Finally, this study shows the environment was verified by confirming that it was performed normally.

• Journal of Aerospace System Engineering
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• v.13 no.3
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• pp.70-77
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• 2019

This study presents the numerical investigation of the trajectory of rocket launched from a helicopter. The nonlinear mathematical model of armed configuration of UH-60 helicopter was developed while Hydra 70 unguided rocket was modeled to simulate the rocket behavior. The effects of various inflow models on the launched rocket trajectory are obtained. Similarly, rocket launch simulation was performed to determine the unsafe flight maneuver condition where the rocket trajectory is critically close to the helicopter main rotor tip path plane.

• Journal of Advanced Navigation Technology
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• v.28 no.4
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• pp.490-496
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• 2024

Flight education is an essential element in ensuring the development and safety of the aviation industry. Korea's aviation industry has grown rapidly, and the need for professional flight training is increasing accordingly. The purpose of this paper is to analyze the current status of Korea's flight education environment and seek ways to improve it. In addition, we examined whether the operation method and educational environment of Korea's professional pilot training institutes were structured appropriately for student education, and conducted a survey on the flight education infrastructure targeting trainees, instructors, and aviation workers receiving training at Korea's pilot training institutes. Through the survey, we investigated the necessity and urgency of improving the infrastructure for domestic flight education and drew meaningful conclusions.

• Journal of Advanced Navigation Technology
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• v.19 no.5
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• pp.370-378
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• 2015

The data acquisition unit, signal acquiring and processing equipment, processes and provides major data of an aircraft such as engine system, power train system, hydraulic system, etc. However, it had lots of failure related to the system during production test flight, and it is necessary to fix them perfectly as soon as possible because of the significance of the equipment. In this paper, it contains failure classification and analysis for each defect element to improve whole software as well as electrical circuit. Particularly, utilizing Fault Injection Method based interworking test, more efficient improvement activity was performed for not only equipment level but also aircraft level, and as a result, it is achieved that considerable betterment of Surion quality and flight safety.

• Journal of Satellite, Information and Communications
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• v.10 no.3
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• pp.114-120
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• 2015

In this paper, we show the design requirements of the cryptographic module and its security algorithm designed to prevent the exposure of the command signal applied to Flight Termination System. The cryptographic module consists of two separate devices that are Command Insertion Device and Command Generation Device. The cryptographic module designed to meet the 3 principles(Confidentiality, Integrity and Availability) for the information security. AES-256 block encryption algorithm and SHA-256 Hash function were applied to the encrypted symmetric key encryption method. The proposed cryptographic module is expected to contribute to the security and reliability of the Flight Termination System for Space Launch Vehicle.

• Aerospace Engineering and Technology
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• v.13 no.2
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• pp.1-6
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• 2014

Power system of the tilt-duct VTOL aerial robot has been developed. This paper focuses on the power train with small liquid-type engine for the R/C boat and presents the test results with design procedures. The hardware aspects of the power system include details about the hardware configurations for the interfaces with the vehicle. The ground test and tether test for measuring the thrust performance of vehicle and evaluating the endurance of power train carried out.

• Journal of Hydrogen and New Energy
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• v.35 no.1
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• pp.56-65
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• 2024

Fuel cell powered unmanned aerial vehicles (UAV) are globally being developed for various application according to hydrogen roadmap. However, safety standards for hydrogen fuel cell for UAV have not been established. Therefore, in this study, we derive safety data based on risk assessment to develop safety standards for fuel cells for UAV. We use fault tree analysis method which is broadly used in hydrogen facilities as a risk assessment tool. We set hydrogen leaks and fires as top events and derived the basic events. Safety data for the basic events were derived by quoting overseas safety standards related to fuel cells. The safety data will be used for developing fuel cell inspection standard according to Act on Hydrogen Economy Promotion and Hydrogen Safety Management.

• Journal of Advanced Navigation Technology
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• v.20 no.5
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• pp.446-452
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• 2016

The aircraft has to be considered for safety very importantly because of peculiarity of flight in the air, so it should be retained through proper inspection and maintenance not only in production phase but also in operating phase. Recently, it is using the latest technology as engineering approach not depending on human factor to determine on maintenance needs, and domestic production rotary aircraft also has the health & usage monitoring system to measure and to monitor major components. However, continued vibration exceedance phenomenon occurred in production and operation phase because of inappropriate thresholds, and it confirmed as false alarm which is not necessary to repair. In this paper, it is described that operational concept of HUMS, and especially it contains a study result for efficiency of aircraft operation and ultimately the improvement of flight safety by optimizing HUMS thresholds to determine efficiently necessity of maintenance under limited conditions and by establishing inspection/maintenance procedures when the re-designated thresholds exceedance occurred.

• The Korean Journal of Air & Space Law and Policy
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• v.14
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• pp.207-240
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• 2001

본 연구에서는 항공운송산업의 발전을 위하여 항공기 운항의 기반이 되는 국내 공역관리의 실태와 문제점을 검토하고, 이의 개선방안을 도출하고져 하였다. 한국은 세계10위의 국제적 민간항공국임에도 불구하고 경쟁력의 원천인 국내여건이 매우 취약한 실정이다. 국내 공역은 약 40만$km^2$인 대구비행정보구역내에 14개소의 접근관제구역과 16개의 항공로가 있고, 민간항공의 비행을 금지하거니 제한하는 71개소의 통제공역과 47개소의 주의공역이 설정되어 있다. 이와 같이 국내 공역은 매우 협소하고 복잡하며, 국가안보의 특수 상황으로 인하여 공역운영의 효율성이 떨어지며, 항공운항의 비경제성과 비행안전요인이 상존하고 있다. 이를 개선하기 위해서는 국가공역관리체제가 실질적이며 체계적으로 확립되어야 하며, 총체적인 국가이익의 극대화를 위하여 안보목적의 군 관할 공역과 민간항공이 활용 가능한 공역의 활당이 최적화 될 수 있도록 공역구조가 재편되어야 한다. 또한 운영상 효율성을 제고하기 위하여 접근관제구역의 광역화, 항공로체제 개선, 공역설계기준의 제정, 수도권 공역 부족의 해소와 미래항행시스댐 운영에 대한 대비가 필요하다.